JPH0686295B2 - Production method of α type hemihydrate gypsum - Google Patents
Production method of α type hemihydrate gypsumInfo
- Publication number
- JPH0686295B2 JPH0686295B2 JP17124087A JP17124087A JPH0686295B2 JP H0686295 B2 JPH0686295 B2 JP H0686295B2 JP 17124087 A JP17124087 A JP 17124087A JP 17124087 A JP17124087 A JP 17124087A JP H0686295 B2 JPH0686295 B2 JP H0686295B2
- Authority
- JP
- Japan
- Prior art keywords
- gypsum
- hemihydrate gypsum
- type hemihydrate
- slurry
- amount
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- ZOMBKNNSYQHRCA-UHFFFAOYSA-J calcium sulfate hemihydrate Chemical compound O.[Ca+2].[Ca+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZOMBKNNSYQHRCA-UHFFFAOYSA-J 0.000 title claims description 39
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- 239000002002 slurry Substances 0.000 claims description 24
- 239000010440 gypsum Substances 0.000 claims description 21
- 229910052602 gypsum Inorganic materials 0.000 claims description 21
- 239000010881 fly ash Substances 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 15
- 238000006243 chemical reaction Methods 0.000 claims description 12
- 150000004683 dihydrates Chemical class 0.000 claims description 11
- 239000002994 raw material Substances 0.000 claims description 5
- 239000007864 aqueous solution Substances 0.000 claims description 4
- 230000001376 precipitating effect Effects 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 17
- 239000000463 material Substances 0.000 description 9
- 239000002245 particle Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 230000036571 hydration Effects 0.000 description 7
- 238000006703 hydration reaction Methods 0.000 description 7
- 239000012798 spherical particle Substances 0.000 description 6
- 239000007789 gas Substances 0.000 description 4
- 239000008187 granular material Substances 0.000 description 4
- 238000001000 micrograph Methods 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- 238000009833 condensation Methods 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000000887 hydrating effect Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009408 flooring Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000010335 hydrothermal treatment Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 235000002648 merrit Nutrition 0.000 description 1
- 244000087976 merrit Species 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 239000011505 plaster Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 description 1
- 239000001509 sodium citrate Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Landscapes
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は二水石こうを原料として加圧水蒸気法又は加圧
水溶液法でα型半水石こうを製造する方法に関する。TECHNICAL FIELD The present invention relates to a method for producing α-type hemihydrate gypsum by using a gypsum dihydrate as a raw material by a pressure steam method or a pressure aqueous solution method.
α型半水石こうは水和凝結後の強度が大きいので新しい
建築基材として有望視されている。Since α-type hemihydrate gypsum has a high strength after hydration and setting, it is regarded as a promising new construction base material.
二水石こうをα型半水石こうに転移させる方法として加
圧法と常圧法が知られており、加圧法には天然石こうや
化学石こうなどを加圧水熱する加圧水蒸気法、これらの
石こうの粉末に水を加えてスラリー状となしオートクレ
ーブなどの加圧容器内での攪拌下に加圧水熱する加圧水
溶液法が知られている。The pressure method and the atmospheric method are known as the methods for transferring dihydrate gypsum to α-type hemihydrate gypsum. In addition, a pressurized aqueous solution method is known in which pressurized hydrothermal treatment is performed while stirring in a pressurized container such as a slurry autoclave or the like.
上記方法で得られたα型半水石こうは脱水乾燥して密閉
容器に保存される。The α-type hemihydrate gypsum obtained by the above method is dehydrated and dried and stored in a closed container.
床材やプラスター、石こうボードなどの建築基材や自動
車、航空機の模型型材用などの用途に応じて、α型半水
石こうを水和凝結させて使用されるが、α型半水石こう
はβ型半水石こうに比べて混水量少なくて流動性をもた
せることができ、凝結後の膨張、収縮も非常に小さい特
質を有している。Depending on the application such as flooring materials, plaster, gypsum board and other building base materials, automobiles, aircraft model mold materials, etc., α-type hemihydrate gypsum is used by hydrating condensation, but α-type hemihydrate gypsum is β Compared to type hemihydrate gypsum, it has a small amount of mixed water and can be made to have fluidity, and has the characteristic that expansion and contraction after setting are very small.
α型半水石こうの流動性はα型半水石こうの粒子形状に
よるところが大きく角ばつた棒状粒子であるが故に流動
性の確保が重要な課題である。従来は流動性確保のため
に多量の水（熱水）でスラリー化していたが流体の取り
扱い量が増えること及び過乾燥において多くの水を
別蒸発させる必要があることの不具合があつた。The fluidity of α-type hemihydrate gypsum largely depends on the particle shape of α-type hemihydrate gypsum, and since it is a rod-shaped particle with angular flakes, securing fluidity is an important issue. Conventionally, a large amount of water (hot water) was slurried in order to secure fluidity, but there were problems that the amount of fluid handled increased and it was necessary to evaporate a large amount of water separately in overdrying.
本発明は上記従来技術水準に鑑み、別蒸発する水量を
少なくすることができ、取扱うスラリー中の水分量を大
幅に低減できるα型半水石膏の製造法を提供しようとす
るものである。In view of the above-mentioned conventional state of the art, the present invention aims to provide a method for producing α-type hemihydrate gypsum that can reduce the amount of water that evaporates separately and can significantly reduce the amount of water in the slurry to be handled.
本発明はα型半水石こう製造工程におけるスラリー又は
粉粒体の流動性を向上させる目的でベアリング効果をも
たらす微小球形粒子をスラリー又は粉粒体に添加混入す
るもので、α型半水石こうの凝結品に要求される品質を
損うことのない微小球形粒子として、石炭焚き排ガス中
に含まれるフライアツシユが最適であることを見い出
し、この知見に基づいて本発明を完成するに至つた。The present invention is to add and mix fine spherical particles that bring a bearing effect to the slurry or the granules for the purpose of improving the fluidity of the slurry or the granules in the α-type hemihydrate gypsum production process. As a fine spherical particle that does not impair the quality required for the aggregated product, it was found that fly ash contained in the coal-fired exhaust gas was optimal, and the present invention was completed based on this finding.
すなわち本発明は二水石こうを原料として加圧水蒸気法
又は加圧水溶液法でα型半水石こうを製造する反応槽に
おいて、石炭焚きフライアツシユを存在させたスラリー
に二水石こうを供給して二水石こうを溶解させα型半水
石こうを析出させることを特徴とするα型半水石こうの
製造法である。That is, the present invention, in a reaction tank for producing α-type hemihydrate gypsum by a pressurized steam method or a pressurized aqueous solution method using dihydrate gypsum as a raw material, supplying dihydrate gypsum to the slurry in which coal-fired fly ash is present A method for producing α-type hemihydrate gypsum characterized by dissolving and precipitating α-type hemihydrate gypsum.
本発明によれば別蒸発の水量を少なくすること及び取
扱うスラリー中の水分量を大幅に削減できるメリツトが
得られる。即ち石炭焚き排ガス中に含まれるフライアツ
シユの粒子構造は、第１図の顕微鏡写真（200倍）に示
すように真球状をしており、これを第２図に示す顕微鏡
写真（100倍）にみられるような角ばつた棒状粒子構造
のα型半水石こう粒子に添加すると、混合粉粒体の流動
性が増すため、極めて少ない水量の添加で（濃厚スラリ
ー濃度で）取扱いができるようになる。According to the present invention, it is possible to obtain a merrit capable of reducing the amount of water separately evaporated and greatly reducing the amount of water in the slurry to be handled. That is, the particle structure of fly ashes included in the coal-fired exhaust gas has a spherical shape as shown in the micrograph of FIG. 1 (200 times), which can be seen in the micrograph of FIG. 2 (100 times). When it is added to the α-type hemihydrate gypsum particles having a rod-like particle structure with a splayed particle shape as described above, the fluidity of the mixed powder and granules is increased, and therefore the handling becomes possible by adding an extremely small amount of water (at a concentrated slurry concentration).
当然ながら、α型半水石こうの品質を損う添加物質は避
ける必要があるが、建築基材として大量の用途に供する
α型半水石こうに石炭焚き排ガス中に含まれるフライア
ツシユは元来セメント等の建築基材として利用されてお
り好都合である。又、α型半水石こうの水和凝結工程に
おいて流動性の確保は重要であり、極力少ない水量（混
水量）で流動性をもたすことが後の凝結、乾燥のために
要求されるがフライアツシユのベアリング効果はよい結
果をもたらす。As a matter of course, it is necessary to avoid additives that impair the quality of α-type hemihydrate gypsum, but α-type hemihydrate gypsum, which is used for a large amount of applications as a building base material, is originally composed of cement etc. It is convenient because it is used as a building base material for. In addition, it is important to secure fluidity in the hydration setting process of α-type hemihydrate gypsum, and it is required for the setting and drying afterwards to have the fluidity with a minimum amount of water (mixed water amount). The fly ash bearing effect gives good results.
以下、本発明の一実施例を第３図によつて説明する。 An embodiment of the present invention will be described below with reference to FIG.
湿式石灰・石膏法排煙脱硫装置から副生するいわゆる排
脱石こう（二水石こう）を二水石こう供給槽Ｔ−１に入
れ水を加えて15wt％スラリーとする。次にこの二水石こ
うスラリーをポンプＰ−１で加熱装置Ｈに送つた後、ポ
ンプＰ−２で反応槽Ｒ−１（容量200l）に送り込む。A so-called exhaust gypsum (dihydrate gypsum) produced as a by-product from the wet lime / gypsum flue gas desulfurization apparatus is put in a dihydrate gypsum supply tank T-1 and water is added to form a 15 wt% slurry. Next, this gypsum dihydrate slurry is sent to the heating device H by the pump P-1, and then sent to the reaction tank R-1 (volume 200 l) by the pump P-2.
反応槽Ｒ−１内のスラリーは140℃に加熱されており、
攪拌機RMでスラリーを混ぜながら、二水石こうを溶解さ
せると、それに伴つて下記式によつてα型半水石こうが
析出する。The slurry in the reaction tank R-1 is heated to 140 ° C,
When dihydrate gypsum is dissolved while mixing the slurry with a stirrer RM, α-type hemihydrate gypsum is precipitated according to the following equation.
CaSO4・2H2O→Ca2++SO4 2-→α・CaSO4・1/2H2O α型半水石こうスラリーは減圧バルブＢ配管Ｌを経由し
て過器Ｃへ送られ、α型半水石こう粒子と熱水に分別
過される。CaSO 4・ 2H 2 O → Ca 2+ + SO 4 2 → → α ・ CaSO 4・ 1 / 2H 2 O α-type hemihydrate gypsum slurry is sent to excess unit C via pressure reducing valve B pipe L and α Separated into hemihydrate gypsum particles and hot water.
Ｔ−２は過器Ｃへのスラリー輸送が固形物の閉塞によ
つて不可能になつた場合に使用する液受槽である。T-2 is a liquid receiving tank used when the slurry cannot be transported to the excess tank C due to the clogging of solids.
反応槽Ｒ−１内のスラリー濃度は約13wt％であり全てα
型半水石こうに転化させ得るためのスラリー平均滞留時
間は0.5時間程度で十分である。The slurry concentration in the reaction tank R-1 is about 13 wt%,
An average residence time of about 0.5 hours is sufficient for the slurry to be converted into mold hemihydrate gypsum.
α型半水石こうの結晶形は滞留時間を短かくすると針状
になる傾向があるので0.01wt％程度のクエン酸ナトリウ
ムを媒晶剤として共存させておくことが好ましい。Since the crystalline form of α-type hemihydrate gypsum tends to become acicular when the residence time is shortened, it is preferable to coexist about 0.01 wt% of sodium citrate as a habit modifier.
従来、反応槽Ｒ−１内のスラリー濃度を高めると、加
熱のための熱量が節減できること、α半水石こう製造
量を増やすことが出来ること、のメリツトが得られる
が、反応槽Ｒ−１から過器Ｃ−１への配管の閉塞が起
こり易くなり閉塞すると運転停止し、液受槽Ｔ−２へス
ラリーをブローして保修しなければならない。従つて、
反応槽Ｒ−１内のスラリー濃度は経験的に13wt％を越え
ないよう配慮していた。Conventionally, by increasing the slurry concentration in the reaction tank R-1, it is possible to reduce the amount of heat for heating and to increase the production amount of α-hemihydrate gypsum, but from the reaction tank R-1 The pipe to the overfiller C-1 is likely to be clogged, and when it is clogged, the operation is stopped and the slurry must be blown into the liquid receiving tank T-2 for maintenance. Therefore,
Empirically, the slurry concentration in the reaction tank R-1 was designed so as not to exceed 13 wt%.
本発明はこの不具合を解消するために、第１図に示した
ような球形の石炭焚排ガス中に含まれるフライアツシユ
を反応槽Ｒ−１内のスラリーに共存させるものである。In order to solve this inconvenience, the present invention causes the fly ash contained in the spherical coal-fired exhaust gas as shown in FIG. 1 to coexist in the slurry in the reaction tank R-1.
フライアツシユを加えるとその添加濃度に応じてα型半
水石こうのスラリー濃度もほゞ比例的に増すことができ
るようになる。即ちフライアツシユの混合量を増やすと
反応槽Ｒ−１内のα型半水石こう濃度を13wt％以上にし
ても反応槽Ｒ−１から過器Ｃへの配管Ｌの閉塞トラブ
ルが抑制できるが閉塞トラブルが抑制できるフライアツ
シユとα型半水石こう濃度は経験的に次の通りであるこ
とと把握した。When the fly ash is added, the slurry concentration of α-type hemihydrate gypsum can be increased almost proportionally according to the addition concentration. That is, if the mixing amount of fly ash is increased, even if the α-type hemihydrate gypsum concentration in the reaction tank R-1 is 13 wt% or more, the clogging trouble of the pipe L from the reaction tank R-1 to the excess vessel C can be suppressed, but the clogging trouble can be suppressed. It was empirically understood that the fly ashes and α-type hemihydrate gypsum concentrations that can be suppressed are as follows.
石炭焚き排ガス中に含まれるフライアツシユの球形粒子
がベアリング効果を示し、棒状のα型半水石こうの流動
性を向上させ、高濃度スラリーの取り扱いが容易になる
訳である。そして、α型半水石こうに石炭焚きフライア
ツシユが混在しても建築基材としての用途に支障がない
利点があり、何よりも添加剤として経済的であるメリツ
トが大きい。フライアツシユはフライアツシユセメント
として建築基材として既に実用化されていることは周知
であるが、α型半水石こうの添加剤として利用できる利
点を本発明はうまく組み合わせたものである。 The spherical particles of fly ashes contained in the coal-fired exhaust gas show a bearing effect, improve the fluidity of the rod-shaped α-type hemihydrate gypsum, and facilitate the handling of high-concentration slurry. Further, even if coal-fired fly ash is mixed with α-type hemihydrate gypsum, there is an advantage that it does not hinder the use as a building base material, and above all, it has a great merit that it is economical as an additive. It is well known that fly ash is already put into practical use as a fly ash cement as a building base material, but the present invention successfully combines the advantages that it can be used as an additive for α-type hemihydrate gypsum.
第３図においてフライアツシユの添加は二水石こう供給
槽Ｔ−１で実施したが水和凝結器Ｒ−２にて添加しても
よい。In FIG. 3, the addition of fly ash is carried out in the gypsum feed tank T-1 but may be added in the hydration condenser R-2.
又、過器Ｃにおける過もフライアツシユ球形粒子が
混在すると、スラリー濃度が高くなつても過性はよく
過ケーキの含水量が少なく乾燥熱量が節減できる利点
が得られた。更にこのフライアツシユ混在α型半水石こ
うを水和凝結器Ｒ−２にて水和凝結させる際、粉粒体の
流動性がベアリング効果でよくなつており、混水量が少
なくなる利点も得られた。フライアツシユの如き球形粒
子がα型半水石こうに混在しておれば水和凝結させる際
に混水量が少なくて済むと云う大きなメリツトは建築基
材としての経済性を向上させる効果をもたらすのでフラ
イアツシユの添加はα型半水石こうの流動性を向上させ
たい工程であれば単に反応槽Ｒ−１のみならず二水石こ
う原料を取扱う二水石こう供給槽Ｔ−１、更にはα型半
水石こうの水和凝結器Ｒ−２等で行つてもよい。In addition, when the fly ashes spherical particles are mixed in the excess in the excess vessel C, the advantage is that even if the slurry concentration is high, the passability is good, the water content of the overcake is small, and the dry heat amount is reduced. Furthermore, when hydrating and condensing this fly-ashu mixed α-type hemihydrate gypsum in the hydration condenser R-2, the fluidity of the powder and granules is improved by the bearing effect, and the advantage that the amount of mixed water is reduced was obtained. . Large spherical mellitus, which means that if spherical particles such as fly ash are mixed in the α-type hemihydrate gypsum, a small amount of water is required for hydration and condensation, will bring about the effect of improving the economic efficiency as a building base material. If the process is to improve the fluidity of α-type gypsum gypsum, not only reaction tank R-1 but also gypsum gypsum supply tank T-1 that handles dihydrate gypsum raw material, and α-type gypsum gypsum Alternatively, the hydration condenser R-2 or the like may be used.
α型半水石こうの製造工程、水和凝結工程に石炭焚きフ
ライアツシユを混在させると、フライアツシユの球形粒
子が棒状のα型半水石こう粒子の間に入り、ベアリング
効果をもたらすため、粉粒体の流動性が増して、配管の
閉塞トラブルを起こさず高スラリー濃度で取り扱える効
果をもたらし、水和凝結混水量も少なくできる利点が得
られる。When coal-fired fly ashes are mixed in the process of producing α-type hemihydrate gypsum and the hydration setting process, the spherical particles of fly ashes enter between the α-type hemihydrate gypsum particles in the form of rods, which results in a bearing effect. The fluidity is increased, the effect of being able to handle at a high slurry concentration without causing the clogging trouble of the pipe, and the advantage that the amount of hydration-condensation mixed water can be reduced is obtained.
第１図はフライアツシユの粒子構造を示す200倍の顕微
鏡写真、第２図はα型半水石こうの結晶構造を示す100
倍の顕微鏡写真、第３図は本発明を実施するα型半水石
こう製造試験設備フローシートを示す図である。Figure 1 shows a 200x micrograph showing the particle structure of fly ash, and Figure 2 shows the crystal structure of α-type hemihydrate gypsum.
Double micrograph, FIG. 3 is a view showing an α-type hemihydrate gypsum production test facility flow sheet for carrying out the present invention.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 筒井 浩養 東京都千代田区丸の内２丁目５番１号 三 菱重工業株式会社内 (56)参考文献 特公 昭57−55649（ＪＰ，Ｂ２) ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Hiroyo Tsutsui 2-5-1, Marunouchi, Chiyoda-ku, Tokyo Sanryo Heavy Industries Co., Ltd. (56) References Japanese Patent Publication No. 57-55649 (JP, B2)
Claims (1)
加圧水溶液法でα型半水石こうを製造する反応槽におい
て、石炭焚きフライアツシユを存在させたスラリーに二
水石こうを供給して二水石こうを溶解させα型半水石こ
うを析出させることを特徴とするα型半水石こうの製造
法。1. In a reaction tank for producing α-type hemihydrate gypsum by using a pressurized steam method or a pressurized aqueous solution method using dihydrate gypsum as a raw material, dihydrate gypsum is supplied to a slurry in which coal-fired fly ash is present. A method for producing α-type hemihydrate gypsum, which comprises dissolving α and precipitating α-type hemihydrate gypsum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17124087A JPH0686295B2 (en) | 1987-07-10 | 1987-07-10 | Production method of α type hemihydrate gypsum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17124087A JPH0686295B2 (en) | 1987-07-10 | 1987-07-10 | Production method of α type hemihydrate gypsum |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6418912A JPS6418912A (en) | 1989-01-23 |
| JPH0686295B2 true JPH0686295B2 (en) | 1994-11-02 |
Family
ID=15919639
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17124087A Expired - Lifetime JPH0686295B2 (en) | 1987-07-10 | 1987-07-10 | Production method of α type hemihydrate gypsum |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0686295B2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5755649B2 (en) | 2009-08-11 | 2015-07-29 | ネオダイン バイオサイエンシーズ， インコーポレイテッド | Apparatus and method for dressing applicator |
-
1987
- 1987-07-10 JP JP17124087A patent/JPH0686295B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5755649B2 (en) | 2009-08-11 | 2015-07-29 | ネオダイン バイオサイエンシーズ， インコーポレイテッド | Apparatus and method for dressing applicator |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6418912A (en) | 1989-01-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110372236B (en) | Method for preparing alpha-type semi-hydrated gypsum from desulfurized ash and product thereof | |
| CN113213498B (en) | Cement-based material carbonization recycling method and calcium carbonate whisker material | |
| JP2026063216A (en) | Method and system for treating lime to form vaterites | |
| CN102603219A (en) | Process for preparing high-activity semi-hydrated gypsum cementing material and gypsum product by aid of phosphorous gypsum | |
| CN1010083B (en) | Method and system for scrubbing cement kiln exhaust gas with cement kiln dust slurry | |
| KR890004634B1 (en) | Manufacturing method of hydraulic cement | |
| CN107746195A (en) | A kind of method of efficiently production alpha semi-hydrated gypsum | |
| CN109879304A (en) | A kind of nano/submicron efficient calcium carbonate carbonization technique | |
| CN106431032B (en) | A kind of microwave preparation method of α-calcium sulfate hemihydrate | |
| US4478810A (en) | Method of treating final products from flue gas desulfurization | |
| CN103585877A (en) | System for preparing magnesium sulfate by using slurry obtained after flue gas desulphurization | |
| JP2024529845A (en) | Production of supplementary cementitious materials by semi-wet carbonation, cyclic carbonation, non-slurry carbonation, high temperature carbonation, granular carbonation | |
| CN101543729B (en) | Method suitable for utilization of resource of sintering flue gas desulphurization waste solution | |
| JPH06226042A (en) | Method for removal of sulfur dioxide from heated gaseous stream containing sulfur dioxide and for production of alpha type calcined gypsum | |
| US5100643A (en) | Processes for removing acid components from gas streams | |
| WO2022237528A1 (en) | Quicklime preparation process and system based on carbon emission reduction | |
| CN109809722A (en) | A kind of calcium and magnesium sulfate double salt cementitious material and its preparation method and application | |
| CN108310954A (en) | A kind of semi-dry process desulfurization dust-removing technique | |
| US4342732A (en) | Sludge fixation and stabilization | |
| WO2023170202A1 (en) | Improvement of reactivity by oxidation | |
| JPH0686295B2 (en) | Production method of α type hemihydrate gypsum | |
| US20230139894A1 (en) | Methods for re-using industrial waste for carbon sequestration and magnesium-based cements | |
| CN106379926B (en) | A kind of method for preparing nanometer calcium sulfate | |
| CN116601116A (en) | Method for producing inorganic compounds using circular resources for reducing greenhouse gas emissions | |
| CN111592261A (en) | Phosphogypsum-based cement retarder and preparation method thereof |