JP4595065B2 - Processing method by solidification of copper concentrate and solidified copper concentrate - Google Patents

Description

【００１７】
銅滓可燃物から銅を濃縮回収して得られた銅濃縮物中の樹脂含量が高いと樹脂は可塑性に乏しいため後述する団鉱機で圧縮成型した後に成型した団鉱が圧縮前の状態の戻る現象を生じるので、転炉処理で要求される強度の団鉱が得られない。
また、銅の含有量が少なく樹脂含量が多い銅濃縮物を転炉で処理するのは問題が多いので銅含量を４５〜６５％、樹脂含量を５〜１５％となるように調整する。例えば、表１の試料Ｂのように銅含有量が少なく樹脂含量が多い銅濃縮物を処理する場合は、表１の試料Ｃのように銅含有量が多く樹脂含量の少ない銅濃縮物と混合することにより銅含有量を４５〜６５％、樹脂含量を５〜１５％となるように調整する（ステップＳ１）。もちろん、表１の試料Ａのように銅含量が４５〜６５％、樹脂含量が５〜１５％である銅濃縮物については混合せずにそのまま使用することもできる。
【００１８】
また、銅濃縮物を圧縮成型し団鉱とする際にその粒径が５ｍｍを超える大きさとなると圧縮成型が困難となるが、銅濃縮物は銅を濃縮し樹脂の含有量を減らす過程でエロホールミル等により粉砕・篩分け等の物理的処理が施されて粉状とされているのでその粒径は５ｍｍを超える場合は少ない。従って、銅濃縮物をそのまま団鉱機に供しても問題はないが、粒径が５ｍｍを超えるような場合にはさらに粉砕機により細かく粉砕して５ｍｍ×５ｍｍのメッシュを通し、その粒径の最大サイズが５ｍｍとなるのものとそれ以上の粒径のものに篩分けして整粒し、粒径の最大サイズが５ｍｍとなるように調整したものを使用するのが好ましい。
【００１９】
一方、団鉱機１０（図２参照）による圧縮力のみでは強度のある団鉱を得にくい場合や団鉱機１０のロール１１ａ、１１ｂとの摩擦を少なくするために銅濃縮物にバインダを添加する（ステップＳ２）。バインダには粉状のものと液状のものがあり、またその作用効果の違いから次の３種類に大別される。
▲１▼ マトリックス系：バインダが銅濃縮物の空隙を充填して粒子間を強く結合させるもの
▲２▼ フィルム系 ：バインダ（液状）の薄膜で銅濃縮物の表面を覆い、バインダの粘着力によって粒子を結合させ、成型後の乾燥で強度を増すもの
▲３▼ 反 応 系 ：バインダ又はバインダと銅濃縮物との化学反応に基づく粘結効果によるもの
バインダの使用にあたっては成型前に銅濃縮物との混合を充分に行なう必要がある。特に液体状のバインダは粒子表面への付着を完全にするため、エッジランナーミル、アイリッシュミキサ等による混合が必要である。
【００２０】
マトリックス系バインダには、例えば、コールタールピッチ、パラフィン、アスファルト、ワックス、ポルトランドセメント、砂糖、粘土、澱粉等がある。
また、フィルム系バインダには、例えば、水、パルプ廃液、ピッチエマルジョン、ベンドナイト、水ガラス（ケイ酸ナトリウム）、糖蜜、膠、澱粉、蔗糖、ＰＶＣ（ポリビニルアルコール）、ＣＭＣＮａ（カルボキシメチルセルロースナトリウム）等がある。
さらに、反応系バインダには、例えば、Ｃａ（ＯＨ）_２、Ｃａ（ＯＨ）_２＋糖蜜、ケイ酸ナトリウム＋ＣａＣｌ_２、ＭｇＯ＋ＭｇＣｌ_２、ＭｇＯ＋Ｆｅ_３Ｏ_４、ケイ酸ナトリウム＋ＣＯ_２等がある。
使用するバインダは無機系であること及びコスト等を考慮すると水ガラスの使用が好ましい。また、水ガラスの添加量は多いほど成型強度が増加する傾向にあるが、６％以上の添加量では成型された団鉱が粘性を帯びて潰れやすくなりロールから排出される時に変形する現象が現れることからその添加量は２〜４％が適当であると考えられる。
【００２１】
次に、調整が終わった銅濃縮物を団鉱機１０により圧縮成型して団鉱を形成する（ステップＳ３）。団鉱機１０は、図２に示すように、互いに近接し、逆方向に同じ速度で回転する２つのロール１１ａ、１１ｂと、ロール１１ａ、１１ｂとの間隙に銅濃縮物を供給するためのホッパ１５と、成型された団鉱を搬送するためのベルトコンベア１７とを有して構成されている。ロール１１ａを支持する軸受けは油圧シリンダ１９で後方から支持され、もう一方のロール１１ｂは団鉱機１０のフレーム１０ａに支持されている。油圧シリンダ１９は不活性ガス或いはＮ_２ガスを封入したアキュムレータ１９ａに接続され、アキュムレータ１９ａ内のガス圧によりロール１１ａ、１１ｂ間の成型圧を一定に保持すると共に、過負荷・異物混入時にはロール１１ａが後退して機械本体を保護するようになっている。尚、油圧シリンダ１９の代わりにスプリングを用いたものも利用できる。
【００２２】
ホッパ１５の内部にはスクリュウ１５ａが設けられており、このスクリュウ１５ａによって供給口１５ｂからホッパ１５内に収納された銅濃縮物に含まれる空気が脱気され密度が高められつつロール１１ａ、１１ｂ間へ送られる。ロール１１ａ、１１ｂの表面には成型物の母型である多数のポケット１３、１３が形成され、ロール１１ａ、１１ｂの回転により所定の形状に成型されるようになっている。ポケット１３、１３の形状としては、図３に示すように、例えば、アーモンド形（図３（ａ））、ピロー形（図３（ｂ））、レンズ形（図３（ｃ））、フィンガ形（図３（ｄ））等がある。そして、成型された団鉱はベルトコンベア１７にて搬送される。
【００２３】
ロール１１ａ、１１ｂの外周端の速度と団鉱の移動速度は同じであるが、ポケット１３、１３の底部とロール１１ａ、１１ｂ外周端では周速が異なるため、団鉱表面とポケット１３、１３表面との間で滑りが起こる。そのため、ポケット１３、１３の形状は、円周方向でポケット１３、１３は連続した曲面で形成され、しかも、滑りによる摩擦抵抗の少ない形状であることが要求される。
【００２４】
ピロー形は、中央部と端部の厚さが同じで、端部が鋭角であるため摩擦抵抗が増加し、ポケット１３、１３からの剥離性に影響がある。一方、アーモンド形はそのような摩擦抵抗が少なく剥離性も良好であるため、ポケット１３、１３の形状はアーモンド形とするのが好ましい。また、団鉱のサイズをあまり大きくすると大きな圧縮力が必要となることや団鉱の取り扱い等が不便になるので、その形状は長さが２５〜４５ｍｍで、幅がその長さの５０〜７０％の大きさであることが好ましい。
【００２５】
銅濃縮物の内部摩擦及び銅濃縮物とロール１１ａ、１１ｂの表面との摩擦による抵抗を減少させて成型効果を高めるためロール１１ａ、１１ｂの表面、特にポケット１３、１３に滑沢剤を塗布するのが効果的である。液体の滑沢剤としては、例えば、水、エチレングリコール、潤滑油、グリセリン、シリコン等があり、固体の滑沢剤としては、例えば、タルク、マグネシウムステアレート、グラファイト、パラフィン、ステアリン酸、ワックス、二硫化モリブデン等がある。また、バインダの中には滑沢剤としての効果を兼ねるものもある。
【００２６】
一方、ロール１１ａ、１１ｂの回転数は、時間あたりの回転数が多いほど処理用が多くなることから処理量を決定する上で重要な要素であるが、粉体の圧縮過程に合致した速度であることが必要である。最適な回転数を得るために団鉱機を用いて行った試験結果を表２に示す。
【００２７】
【表２】

【００２８】
その結果、１．６ｒｐｍと５．８ｒｐｍとでは圧壊強度に特に顕著な差は見られないが、５．８ｒｐｍの場合は歩留が少し悪くなる。また、スクリュウ１５ａにより銅濃縮物の脱気と嵩密度を上げることによってロール１１ａ、１１ｂの回転速度を増大させることも可能となる。しかし、あまり回転数を上げると圧縮力が銅濃縮物の内部まで伝播せず、圧壊強度及び歩留が低下してしまう。従って、時間あたりの回転数が多いほど処理量が多くなることを考慮してロール１１ａ、１１ｂの回転数は１〜３ｒｐｍであることが好ましいと考えられる。
【００２９】
また、ロール支持圧力について、表３に示すように、１４０ｋｇ／ｃｍ^２及び１７０ｋｇ／ｃｍ^２の圧力で圧縮成型試験を行った。落下強度は同一の圧力で成型して得られた団鉱１０個を２ｍの高さからコンクリート床上に落下させ、破損した落下回数と破損率３０％以下の残個数及び＋９．５ｍｍの残存率で示している。その結果、ロール支持圧力が１４０ｋｇ／ｃｍ^２及び１７０ｋｇ／ｃｍ^２の場合では、いずれのロール支持圧力でも当日より翌日の圧壊及び落下強度が向上しており、養生期間をおくことで所要の強度を得ることができる。従って、ロール支持圧力を１４０〜１７０ｋｇ／ｃｍ^２で運転することが好ましいと考えられる。
【００３０】
【表３】

【００３１】
ここで、団鉱機１０の動作について簡単に説明する。供給口１５ｂからホッパ１５内に投入された銅濃縮物はスクリュウ１５ａにより攪拌されて脱気されつつ、ロール１１ａ、１１ｂの間隙部に供給される。そして、銅濃縮物は回転するロール１１ａ、１１ｂの表面に団鉱がアーモンド形になるような母型とされたポケット１３、１３内に充填される。ロール１１ａ、１１ｂの表面（特にポケット１３、１３）には予め滑沢剤が塗布されておりその剥離性が改善されている。ロール１１ａ、１１ｂがさらに回転すると銅濃縮物は圧縮され、アーモンド形の団鉱となる。
【００３２】
このようにして得られた団鉱を操業中の転炉５０のフード５１側面に設けられた装入口５３から装入する（ステップＳ４）。従って、転炉５０を傾転してフード５１開けるという作業が必要ないので送風中であっても転炉５０内に装入することができ、転炉５０の操業を阻害せず、転炉５０の生産能力を低下させることなく操業することができる。
【００３３】
【発明の効果】
本発明によれば、銅濃縮物を圧縮成型して団鉱とし転炉に装入するため、銅濃縮物が転炉の排ガス中にダストとして飛散するとなく処理できるという効果を有すると共に、銅濃縮物を転炉傾転させることなく装入することができるので転炉の操業を阻害せず、これにより転炉の生産能力を低下させることなく操業することができるという効果を有する。
また、銅濃縮物を転炉で故銅（銅スクラップ）として処理することができるので、銅滓可燃物の処理量を増やすことができるという効果がある。
さらに、銅濃縮物を反応熱が過剰となる転炉の造銅期に銅スクラップとして処理することにより、熱エネルギの有効利用を図ることが可能となるという効果を有する。
【図面の簡単な説明】
【図１】本発明に係る銅濃縮物の固形化による処理方法の一実施形態のフローチャートである。
【図２】団鉱機の縦断面図である。
【図３】団鉱の形状を示す斜視図であり、（ａ）はアーモンド形、（ｂ）はピロー形、（ｃ）はレンズ形、（ｄ）はフィンガ形を示す。
【図４】（ａ）は転炉の正面図、（ｂ）は転炉の側面図である。
【図５】従来の銅濃縮物処理のフローチャートである。
【図６】自溶炉の縦断面図である。
【符号の説明】
１０ 団鉱機
１０ａ フレーム
１１ａ ロール
１１ｂ ロール
１３ ポケット
１５ ホッパ
１５ａ スクリュウ
１５ｂ 供給口
１７ ベルトコンベア
１９ 油圧シリンダ
１９ａ アキュムレータ
４０ 自溶炉
５０ 転炉[0001]
[Technical field to which the invention belongs]
The present invention relates to a treatment method by solidification of a copper concentrate and a solidification product of a copper concentrate. More specifically, the present invention relates to a converter by solidifying a copper concentrate obtained by physical treatment of a copper flammable material that is a recycled raw material. It is related with the technique which obtains rough copper by processing by.
[0002]
[Prior art]
First, the general flow of copper smelting will be described.
The ore that has been mined from the mine is called “crude ore” and contains a large amount of valueless substances (gangue) in addition to useful minerals. Remove as tailings and use high-grade concentrate for smelting. The beneficiation is performed by utilizing the physical or physicochemical properties of minerals, such as differences in density, hardness, magnetism, conductivity, wettability and the like.
[0003]
The concentrate obtained by the beneficiation reduces the heat energy used in the smelting process, facilitates the handling of the ore to the furnace and the transportation, etc., and prevents the decrease in reactivity due to moisture. For the purpose, drying using heat is performed. Drying is performed using, for example, a rotary dryer having the same shape as a rotary kiln having a long cylindrical furnace slightly inclined.
[0004]
The obtained concentrate is blown into the flash smelting furnace 40 simultaneously with oxygen-enriched air or high-temperature hot air to cause a chemical reaction instantaneously and separate into mat and slag. As shown in FIG. 6, the flash smelting furnace 40 is composed of a reaction shaft 41, a setter 43, and an uptake 45, and the reaction shaft 41 is provided with 1 to 3 concentrate burners 47 and 47. The concentrate is blown into the furnace from the concentrate burners 47 and 47. The flash smelting furnace is characterized by a lower fuel consumption rate than other methods because it uses the heat of oxidation reaction of concentrate.
In addition, since there is a possibility that the heat quantity is insufficient only by the oxidation reaction heat, the concentrate burners 47 and 47 are supplemented with heavy oil or the like.
The mat obtained here contains 60 to 65% copper. Further, since about 1% of copper is contained in the slag, the slag is smelted in the smelting furnace 49, recovered as a mat, and processed in the converter 50 together with the mat from the flash smelting furnace 40.
[0005]
The converter 50 is a cylindrical horizontal type and is lined with magnesite or chrome magnesite brick, and can be tilted back and forth by an electric motor for convenience of charging and discharging (see FIG. 4). A number of tuyere 57 are provided below the side surface of the furnace, whereby pressurized air of about 100 kPa (1 kg / cm ² ) is directly blown into the molten mat as a gauge pressure.
The operation is divided into a slag formation period (making process) and a copper making period, and the iron in the mat is removed as slag in the slag generation period. This slag production period is repeated 2 to 3 times, and the produced white glue reaches a certain amount and then enters the copper making period to obtain crude copper.
The heat source uses the oxidation heat of sulfide in both the slag production period and the copper making period, and no fuel is used. In particular, since the reaction heat becomes excessive during the copper making stage, anode scrap (electrolytic residue copper), copper scrap and the like generated during electrolysis are treated.
The obtained crude copper is adjusted in S and O in the crude copper in a horizontal tilt type or reflection furnace type refining furnace, the anode is cast, and high-grade electrolytic copper is obtained by electrolytic refining.
[0006]
In this copper smelting process, we collect valuable metals such as copper from recycled materials such as waste printed circuit boards, waste electronic and electrical parts containing copper and other valuable metals, and make effective use of combustible materials such as copper slag. In order to plan, those combustibles were processed in a converter. However, since the copper flammables have a high resin content, conventionally, as shown in FIG. 5, the copper flammables are crushed, sieved, and physically sorted to remove the resin to obtain a copper concentrate. This was processed in the converter.
[0007]
In other words, combustible copper slag contains a large amount of resin, so if it is processed as it is in a converter, it causes heat deformation and erosion of the hood due to afterburning, scattering to the exhaust gas passage and blockage due to welding, etc. End up. As a result, the deterioration of the exhaust gas introduction system equipment of the converter becomes remarkable, resulting in an increase in equipment maintenance costs and a problem that stable operation is hindered. Therefore, in order to prevent these problems, combustible copper slag is crushed and sieved, and the resin content is reduced by physical sorting such as electrical sorting such as eddy current sorting and electrostatic sorting, using the specific gravity difference or magnetic force. At the same time, copper was concentrated and recovered to obtain a copper concentrate, which was processed in a converter.
[0008]
[Problems to be solved by the invention]
However, the copper concentrate that has been subjected to physical treatment such as pulverization and sieving is in the form of powder, so if the copper concentrate is charged into the converter as it is, it will be scattered as dust in the exhaust gas of the converter. It was difficult to process with a converter.
In addition, if the copper concentrate can be processed without generating dust in the converter, it is possible to increase the amount of combustible copper soot combustible that is a recycled material.
Furthermore, it is possible to effectively use the heat energy of the converter.
Then, an object of this invention is to provide the processing method by solidification of the copper concentrate which makes it possible to process a copper concentrate with a converter, without generating dust.
Moreover, it aims at providing the solidified material of the copper concentrate which makes it possible to process with a converter with such a processing method.
[0009]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that the resin content is obtained by physical sorting utilizing a difference in physical properties from a pulverized and sieved combustible material containing copper and resin. copper was concentrated recovered together reduce the amount, briquettes with its copper content is 45 to 65%, a resin content of 5-15%, copper concentrate maximum size of the particle size is adjusted to be 5mm In the state of increasing the density while degassing with the screw of the machine, it is fed into two rolls that are close to each other and rotate in the opposite direction at the same speed, the roll support pressure is 140 to 170 Kg / cm ² , and the roll rotation speed is 1 A step of compression molding to a size of 25 to 45 mm at 3 rpm and a width of 50 to 70% of the length, forming a briquette, a step of setting a predetermined curing period, and tilting the converter Open the hood without rolling And the process of putting briquette into the converter in operation from the inlet provided in the hood without any dust, so that the copper concentrate is processed in the converter without generating dust from the copper concentrate. And providing a processing method by solidification of a copper concentrate, characterized in that it is crude copper.
[0010]
In order to solve the above-mentioned problems, the invention according to claim 2 is characterized in that , in the processing method by solidification of the copper concentrate according to claim 1, the briquette is formed into an almond shape .
[0012]
In order to solve the above-mentioned problems, the invention described in claim 3 is the treatment method according to claim 1 or 2 , wherein the copper concentrate is added with a binder for improving the strength. It is characterized by being.
[0013]
In order to solve the above problems, the invention according to claim 4 is formed on the outer peripheral surface of the roll of the briquetting machine in the processing method by solidification of the copper concentrate according to any one of claims 1 to 3 . It is characterized by spraying a lubricant to increase the peelability of the pocket, which is the matrix of the briquette.
[0014]
In order to solve the above-mentioned problems, the invention according to claim 5 includes the inclusion of a resin by physical sorting using a difference in physical properties from pulverized and sieved combustible copper soot that is a recycling raw material containing copper and resin. Reduce the amount and concentrate and recover the copper, and the copper content is 45 to 65%, the resin content is 5 to 15% and the maximum particle size is adjusted to 5 mm. A binder for improving strength is added, and the copper concentrate is deaerated with a screw of a briquetting machine and is fed into two rolls rotating at the same speed in the opposite direction in close proximity to each other while increasing the density. The support pressure is 140 to 170 Kg / cm ² , the roll rotation number is 1 to 3 rpm, the length is 25 to 45 mm, and the width is 50 to 70% of the length to form a briquette, Have a prescribed curing period A solidified copper concentrate is provided.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a preferred embodiment of a method for solidifying a copper concentrate and a solidified copper concentrate according to the present invention will be described in more detail with reference to the drawings. Here, FIG. 1 is a flowchart of an embodiment of a processing method by solidification of a copper concentrate according to the present invention. The content of copper and combustibles in copper flammables, which are recycled raw materials for waste printed circuit boards and waste electronic / electrical parts, vary depending on the type, but ordinary copper flammables contain resin components rather than copper. Consists of a large amount. For reference, an example of the composition of the copper flammable material before concentrating copper is as follows: Cu: 24.5%, resin: 42.5%, SiO2: 20.8%, Fe: 4.8% It has become. By comminuting and sieving such copper soot combustibles, the resin content is reduced by the specific gravity difference, magnetic force, or physical sorting such as electrical sorting such as eddy current sorting and electrostatic sorting, and the copper is concentrated. It collect | recovers and it is set as a copper concentrate (step S1). Here, Table 1 shows the components of various copper concentrates.
[0016]
[Table 1]

[0017]
If the content of the resin in the copper concentrate obtained by concentrating and recovering copper from the combustible copper slag is high, the resin is poor in plasticity. Since the returning phenomenon occurs, the briquette having the strength required in the converter process cannot be obtained.
In addition, since it is problematic to treat a copper concentrate having a small copper content and a high resin content in a converter, the copper content is adjusted to 45 to 65% and the resin content to 5 to 15%. For example, when processing a copper concentrate with a low copper content and a high resin content as in Sample B of Table 1, it is mixed with a copper concentrate with a high copper content and a low resin content as in Sample C of Table 1. Thus, the copper content is adjusted to 45 to 65% and the resin content to 5 to 15% (step S1). Of course, a copper concentrate having a copper content of 45 to 65% and a resin content of 5 to 15% as in Sample A in Table 1 can be used as it is without being mixed.
[0018]
In addition, when the copper concentrate is compression molded to form briquettes, if the particle size exceeds 5 mm, compression molding becomes difficult. However, the copper concentrate is an erotic process in the process of concentrating copper and reducing the resin content. Since it is made into a powder form by being subjected to physical treatment such as pulverization and sieving by a hole mill or the like, the particle size is less than 5 mm. Therefore, there is no problem if the copper concentrate is directly supplied to a briquetting machine, but if the particle size exceeds 5 mm, it is further finely pulverized by a pulverizer and passed through a 5 mm × 5 mm mesh. It is preferable to use a powder having a maximum size of 5 mm and a particle size larger than that and adjusted so that the maximum particle size is 5 mm.
[0019]
On the other hand, a binder is added to the copper concentrate in order to reduce the friction with the rolls 11a and 11b of the briquetting machine 10 when it is difficult to obtain a strong briquette only by the compression force of the briquetting machine 10 (see FIG. 2). (Step S2). There are two types of binders, one in powder form and the other in liquid form.
(1) Matrix system: Binder fills the voids of the copper concentrate and bonds the particles strongly. (2) Film system: Covers the surface of the copper concentrate with a thin film of binder (liquid), and the adhesive strength of the binder. (3) Reacting system: due to the caking effect based on the chemical reaction between the binder or the binder and the copper concentrate When using the binder, the copper concentrate before molding It is necessary to thoroughly mix with In particular, a liquid binder needs to be mixed by an edge runner mill, an Irish mixer or the like in order to completely adhere to the particle surface.
[0020]
Examples of the matrix binder include coal tar pitch, paraffin, asphalt, wax, Portland cement, sugar, clay, and starch.
Examples of the film binder include water, pulp waste liquid, pitch emulsion, bendnite, water glass (sodium silicate), molasses, glue, starch, sucrose, PVC (polyvinyl alcohol), CMCNa (carboxymethylcellulose sodium), and the like. There is.
Further, examples of the reaction system binder include Ca (OH) ₂ , Ca (OH) ₂ + molasses, sodium silicate + CaCl ₂ , MgO + MgCl ₂ , MgO + Fe ₃ O ₄ , sodium silicate + CO _{2, and the} like.
In view of the fact that the binder to be used is inorganic and the cost and the like, it is preferable to use water glass. In addition, as the amount of water glass added increases, the molding strength tends to increase. However, when the amount added is 6% or more, the molded ore becomes viscous and tends to be crushed and deformed when discharged from the roll. Since it appears, the addition amount is considered to be 2 to 4%.
[0021]
Next, the copper concentrate that has been adjusted is compression molded by the briquetting machine 10 to form briquettes (step S3). As shown in FIG. 2, the briquetting machine 10 is a hopper for supplying copper concentrate to a gap between two rolls 11a and 11b that are close to each other and rotate at the same speed in opposite directions, and the rolls 11a and 11b. 15 and a belt conveyor 17 for conveying the formed briquette ore. The bearing that supports the roll 11 a is supported from behind by the hydraulic cylinder 19, and the other roll 11 b is supported by the frame 10 a of the briquetting machine 10. The hydraulic cylinder 19 is connected to an accumulator 19a filled with an inert gas or N ₂ gas, and the molding pressure between the rolls 11a and 11b is kept constant by the gas pressure in the accumulator 19a. Retreats to protect the machine body. In addition, the thing using a spring instead of the hydraulic cylinder 19 can also be utilized.
[0022]
A screw 15a is provided inside the hopper 15, and the air contained in the copper concentrate stored in the hopper 15 is degassed from the supply port 15b by the screw 15a, and the density is increased between the rolls 11a and 11b. Sent to. A large number of pockets 13 and 13 which are mother molds are formed on the surfaces of the rolls 11a and 11b, and are formed into a predetermined shape by the rotation of the rolls 11a and 11b. As the shapes of the pockets 13 and 13, as shown in FIG. 3, for example, almond shape (FIG. 3A), pillow shape (FIG. 3B), lens shape (FIG. 3C), finger shape (FIG. 3D). Then, the formed ore is conveyed by the belt conveyor 17.
[0023]
The speed of the outer peripheral edge of the rolls 11a and 11b and the moving speed of the briquette are the same, but the circumferential speed is different between the bottom of the pockets 13 and 13 and the outer circumferential edge of the roll 11a and 11b. Slip occurs between. For this reason, the pockets 13 and 13 are required to have a shape in which the pockets 13 and 13 are formed in a continuous curved surface in the circumferential direction and have a low frictional resistance due to sliding.
[0024]
The pillow type has the same thickness at the center portion and the end portion, and since the end portion has an acute angle, the frictional resistance increases, and the peelability from the pockets 13 and 13 is affected. On the other hand, since the almond shape has such a low frictional resistance and good peelability, the shape of the pockets 13 and 13 is preferably an almond shape. Also, if the size of the ore is too large, a large compressive force is required and handling of the ore is inconvenient, so the shape is 25 to 45 mm in length and 50 to 70 in width. % Is preferable.
[0025]
A lubricant is applied to the surfaces of the rolls 11a and 11b, particularly the pockets 13 and 13, in order to reduce the internal friction of the copper concentrate and the friction caused by the friction between the copper concentrate and the surfaces of the rolls 11a and 11b, thereby enhancing the molding effect. Is effective. Examples of the liquid lubricant include water, ethylene glycol, lubricating oil, glycerin, and silicon. Examples of the solid lubricant include talc, magnesium stearate, graphite, paraffin, stearic acid, wax, There are molybdenum disulfide and the like. Some binders also serve as a lubricant.
[0026]
On the other hand, the number of rotations of the rolls 11a and 11b is an important factor in determining the amount of processing because the amount of processing increases as the number of rotations per hour increases, but at a speed that matches the powder compression process. It is necessary to be. Table 2 shows the results of tests performed using a briquetting machine in order to obtain the optimum rotational speed.
[0027]
[Table 2]

[0028]
As a result, there is no significant difference in the crushing strength between 1.6 rpm and 5.8 rpm, but the yield is slightly worse at 5.8 rpm. It is also possible to increase the rotational speed of the rolls 11a and 11b by increasing the deaeration and bulk density of the copper concentrate with the screw 15a. However, if the rotational speed is increased too much, the compressive force will not propagate to the inside of the copper concentrate, and the crushing strength and yield will decrease. Therefore, it is considered that the rotation speed of the rolls 11a and 11b is preferably 1 to 3 rpm considering that the processing amount increases as the rotation speed per time increases.
[0029]
Further, as shown in Table 3, the roll support pressure was subjected to a compression molding test at a pressure of 140 kg / cm ² and 170 kg / cm ² . The drop strength is 10 briquettes obtained by molding at the same pressure, dropped on a concrete floor from a height of 2m, the number of broken drops, the remaining number of damage less than 30% and the remaining rate of + 9.5mm Show. As a result, in the case where the roll support pressure is 140 kg / cm ² and 170 kg / cm ² , the crushing and dropping strength of the next day is improved from the same day at any roll support pressure, and the required strength can be obtained by setting a curing period. Obtainable. Therefore, it is considered preferable to operate at a roll support pressure of 140 to 170 kg / cm ² .
[0030]
[Table 3]

[0031]
Here, the operation of the briquetting machine 10 will be briefly described. The copper concentrate thrown into the hopper 15 from the supply port 15b is supplied to the gap between the rolls 11a and 11b while being stirred and degassed by the screw 15a. Then, the copper concentrate is filled in the pockets 13 and 13 which are formed into a matrix such that briquettes are almond-shaped on the surfaces of the rotating rolls 11a and 11b. Lubricants are applied in advance to the surfaces of the rolls 11a and 11b (particularly the pockets 13 and 13), and the peelability is improved. When the rolls 11a and 11b further rotate, the copper concentrate is compressed into almond-shaped briquettes.
[0032]
The briquette thus obtained is charged from the charging port 53 provided on the side surface of the hood 51 of the converter 50 in operation (step S4). Therefore, since the operation of tilting the converter 50 and opening the hood 51 is not required, the converter 50 can be charged even while the air is being blown, and the operation of the converter 50 is not hindered. It is possible to operate without reducing the production capacity.
[0033]
【The invention's effect】
According to the present invention, since the copper concentrate is compression-molded and charged into a converter as a briquette, the copper concentrate can be processed without being scattered as dust in the exhaust gas of the converter, and the copper concentrate Since the product can be charged without tilting the converter, the operation of the converter is not hindered, thereby having the effect of being able to operate without reducing the production capacity of the converter.
Moreover, since a copper concentrate can be processed as dead copper (copper scrap) in a converter, there is an effect that the amount of copper-burnable combustibles can be increased.
Furthermore, it has the effect that it becomes possible to aim at the effective utilization of a thermal energy by processing a copper concentrate as a copper scrap in the copper making period of the converter where reaction heat becomes excessive.
[Brief description of the drawings]
FIG. 1 is a flowchart of an embodiment of a processing method by solidification of a copper concentrate according to the present invention.
FIG. 2 is a longitudinal sectional view of a briquetting machine.
FIG. 3 is a perspective view showing the shape of briquette, wherein (a) shows an almond shape, (b) a pillow shape, (c) a lens shape, and (d) a finger shape.
4A is a front view of a converter, and FIG. 4B is a side view of the converter.
FIG. 5 is a flowchart of conventional copper concentrate processing.
FIG. 6 is a longitudinal sectional view of a flash furnace.
[Explanation of symbols]
10 Grouping machine 10a Frame 11a Roll 11b Roll 13 Pocket 15 Hopper 15a Screw 15b Supply port 17 Belt conveyor 19 Hydraulic cylinder 19a Accumulator 40 Flash furnace 50 Converter

Claims (5)

The copper content is reduced by concentrating and recovering the copper content by reducing the resin content by physical sorting using the difference in physical properties from the combustible material of copper slag, which is a recycled raw material containing copper and resin. ~ 65%, the resin content is 5-15%, and the copper concentrates adjusted to have a maximum particle size of 5 mm are degassed with the screw of the mining machine while increasing the density. It is fed into two rolls that are close and rotate at the same speed in opposite directions, the roll support pressure is 140 to 170 kg / cm ² , the roll rotation speed is 1 to 3 rpm, the length is 25 to 45 mm, and the width is the length. A step of compression molding to a size of 50 to 70% to make a briquette,
A process of setting a predetermined curing period, and
Without tilting the converter and without opening the hood, the step of introducing the briquette into the converter being operated from the loading port provided in the hood ;
A process for solidifying a copper concentrate, wherein the copper concentrate is processed in a converter to produce crude copper without generating dust due to the copper concentrate. In the processing method by solidification of the copper concentrate of Claim 1,
The briquette is formed into an almond shape , and is a processing method by solidification of a copper concentrate. In the processing method by solidification of the copper concentrate of Claim 1 or 2 ,
The briquette is added with a binder for improving its strength, and is a processing method by solidification of a copper concentrate. In the processing method by solidification of the copper concentrate of any one of Claim 1 to 3 ,
A processing method by solidification of a copper concentrate, characterized in that a lubricant is sprayed in order to enhance the peelability in pockets which are a matrix of the briquette formed on the outer peripheral surface of the roll of the briquetting machine. The copper content is reduced by concentrating and recovering the copper content by reducing the resin content by physical sorting using the difference in physical properties from the combustible material of copper slag, which is a recycled raw material containing copper and resin. A binder for improving the strength is added to a copper concentrate adjusted to have a resin content of 5 to 15% and a particle size of 5 to 15% and a maximum particle size of 5 mm, and the copper concentrate Are fed into two rolls that are close to each other and rotate at the same speed in the opposite direction in a state where the density is increased while being degassed by the screw of the mining machine, and the roll support pressure is 140 to 170 Kg / cm ² , Is a solidified copper concentrate having a length of 25 to 45 mm at 1 to 3 rpm, a width of 50 to 70% of the length, and formed into a briquette, and a predetermined curing period .

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