JPS5834411B2 - General Alphabet - Google Patents
General AlphabetInfo
- Publication number
- JPS5834411B2 JPS5834411B2 JP13696975A JP13696975A JPS5834411B2 JP S5834411 B2 JPS5834411 B2 JP S5834411B2 JP 13696975 A JP13696975 A JP 13696975A JP 13696975 A JP13696975 A JP 13696975A JP S5834411 B2 JPS5834411 B2 JP S5834411B2
- Authority
- JP
- Japan
- Prior art keywords
- gypsum
- type hemihydrate
- present
- slurry
- columnar
- 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
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 claims description 13
- 229910052602 gypsum Inorganic materials 0.000 claims description 12
- 239000010440 gypsum Substances 0.000 claims description 12
- 239000002002 slurry Substances 0.000 claims description 9
- 239000003607 modifier Substances 0.000 claims description 8
- 150000004684 trihydrates Chemical class 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 229910021586 Nickel(II) chloride Inorganic materials 0.000 claims description 4
- QMMRZOWCJAIUJA-UHFFFAOYSA-L nickel dichloride Chemical compound Cl[Ni]Cl QMMRZOWCJAIUJA-UHFFFAOYSA-L 0.000 claims description 4
- 229940074404 sodium succinate Drugs 0.000 claims description 4
- ZDQYSKICYIVCPN-UHFFFAOYSA-L sodium succinate (anhydrous) Chemical compound [Na+].[Na+].[O-]C(=O)CCC([O-])=O ZDQYSKICYIVCPN-UHFFFAOYSA-L 0.000 claims description 4
- LGQLOGILCSXPEA-UHFFFAOYSA-L nickel sulfate Chemical compound [Ni+2].[O-]S([O-])(=O)=O LGQLOGILCSXPEA-UHFFFAOYSA-L 0.000 claims description 3
- 229910000363 nickel(II) sulfate Inorganic materials 0.000 claims description 3
- 239000001509 sodium citrate Substances 0.000 claims description 3
- 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 claims description 3
- 239000013078 crystal Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000004455 differential thermal analysis Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/46—Sulfates
- C01F11/466—Conversion of one form of calcium sulfate to another
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
Description
【発明の詳細な説明】
本発明は柱状α型半水石膏の製造法に関するものである
。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing columnar α-type hemihydrate gypsum.
石膏には種々の結晶構造があるが、α型半水石膏は、強
度の点で優れており各種の建材として期待されている。Gypsum has various crystal structures, but α-type hemihydrate gypsum has excellent strength and is expected to be used as a variety of building materials.
しかして、α型半水石膏には柱状、針状、板状の結晶形
状があり、それぞれの特徴を生かした用途が期待される
ため、上記の特定の形状のα型半水石膏を純品として得
ることは望ましいことである。However, α-type hemihydrate gypsum has columnar, needle-like, and plate-like crystal shapes, and applications that take advantage of the characteristics of each type are expected. It is desirable to obtain as follows.
α型半水石膏の製造方法としては、従来より三水石膏と
水とのスラリーを加圧下、加熱処理する所謂加圧水溶液
法が知られており、近時、この処理を適当な媒晶剤の存
在下に行うことにより所望する形状のα型半水石膏を得
る方法が提案されている。The so-called pressurized aqueous solution method, in which a slurry of gypsum trihydrate and water is heat-treated under pressure, has been known as a method for producing α-type gypsum hemihydrate. A method has been proposed in which α-type hemihydrate gypsum of a desired shape is obtained by carrying out the process in the presence of
しかしながら、従来公知の方法では、反応に長時間を要
するとともに、所望する形状のα型半水石膏な純品とし
て得ることが困難である。However, in the conventionally known methods, the reaction takes a long time and it is difficult to obtain a pure α-type hemihydrate gypsum in the desired shape.
本発明者等は上記実情に鑑み、特に、柱状α型半水石膏
の工業的有利な製造法につき種々検討した結果、成る特
定の媒晶剤を組合わせて使用する場合は、短時間で、し
かも、大略純品の柱状α型半水石膏を得ることができる
という知見を得、本発明を完成した。In view of the above-mentioned circumstances, the present inventors have conducted various studies on industrially advantageous production methods for columnar α-type hemihydrate gypsum, and have found that when using a combination of specific crystal modifiers, Furthermore, the present invention was completed based on the knowledge that substantially pure columnar α-type hemihydrate gypsum can be obtained.
すなわち、本発明の要旨は、三水石膏と水よりなるスラ
リーを加圧下、加熱してα型半水石膏を製造するに際し
、
（１）クエン酸ナトリウム及び／又はコハク酸ナトリウ
ムと
（２）硫酸ニッケル及び／又は塩化ニッケルな媒晶剤と
して、該スラリー中に存在させることを特徴とする柱状
α型半水石膏の製法に存する。That is, the gist of the present invention is that when producing α-type hemihydrate by heating a slurry consisting of gypsum trihydrate and water under pressure, (1) sodium citrate and/or sodium succinate and (2) sulfuric acid are used. The present invention resides in a method for producing columnar α-type hemihydrate gypsum, characterized in that nickel and/or nickel chloride are present as modifiers in the slurry.
本発明の詳細な説明するに、本発明に適用される三水石
膏としては、例えば、天然石膏、排煙脱硫石膏等が挙げ
られる。To explain the present invention in detail, trihydrate gypsum applicable to the present invention includes, for example, natural gypsum, flue gas desulfurization gypsum, and the like.
これらの石膏は、通常、５０μ〜８０μ程度に均一に粉
砕したのち、水と混合してスラリーとされる。These gypsums are usually ground to a uniform size of about 50 to 80 microns, and then mixed with water to form a slurry.
この際の水の量は、通常、石膏に対して２〜５０重量倍
、好ましくは、３〜３０重量倍の範囲から選ばれる。The amount of water at this time is usually selected from a range of 2 to 50 times the weight of gypsum, preferably 3 to 30 times the weight of gypsum.
このようにして調整されたスラリーは、通常、オートク
レープ等の耐圧容器を使用して攪拌下、１〜８ Ｋｇ／
ｃｄＧの加圧下で加熱処理される。The slurry prepared in this way is usually stirred in a pressure-resistant container such as an autoclave at a rate of 1 to 8 kg/kg.
Heat treated under pressure of cdG.
加熱処理温度は、通常、１１０〜１５０℃、好ましくは
、１２０〜１３０℃であり、処理時間は、通常、１〜５
時間、好ましくは、１〜２時間程度である。The heat treatment temperature is usually 110-150°C, preferably 120-130°C, and the treatment time is usually 1-50°C.
The time, preferably about 1 to 2 hours.
本発明では、上述の加熱処理を、クエン酸ナトリウム及
び／又はコハク酸ナトリウムと硫酸ニッケル及び／又は
塩化ニッケルとからなる媒晶剤の存在下に行なうことを
必須の要件とする。In the present invention, it is essential that the above-mentioned heat treatment be performed in the presence of a modifier consisting of sodium citrate and/or sodium succinate and nickel sulfate and/or nickel chloride.
これらの媒晶剤の存在量は、それぞれ三水石膏に対して
０．０１〜５．０重量饅、好ましくは、０．０５〜２．
０重量％であるが、両者の割合は、クエン酸す） リウ
ム又はコハク酸ナトリウム１重量部に対し、硫酸ニッケ
ル又は塩化ニッケルを１〜３重量部、好ましくは、２重
量部程度とするのが好ましい。The amount of these modifiers is 0.01 to 5.0% by weight, preferably 0.05 to 2.0% by weight, based on trihydrate.
However, the ratio of both is 1 to 3 parts by weight, preferably about 2 parts by weight, of nickel sulfate or nickel chloride per 1 part by weight of lium citric acid or sodium succinate. preferable.
これらの媒晶剤は、予め三水石膏中に添加しても、スラ
リーの調整後に添加してもよい。These crystal modifiers may be added to the trihydrate gypsum in advance or after the slurry is prepared.
加熱処理により生成した柱状α型半水石膏は、常法に従
って、濾過、洗浄される。The columnar α-type hemihydrate gypsum produced by the heat treatment is filtered and washed according to a conventional method.
洗浄後は、通常、９０〜１５０℃の温度で１〜３時間乾
燥され、必要に応じて研磨処理等を施したのち製品化さ
れる。After washing, it is usually dried at a temperature of 90 to 150° C. for 1 to 3 hours, and if necessary, subjected to polishing treatment, etc., and then manufactured into a product.
本発明によれば、特定の媒晶剤を組合わせて使用するこ
とにより、容易に柱状α型半水石膏を大略純品として得
ることができるので、その工業的価値は極めて犬である
。According to the present invention, columnar α-type hemihydrate gypsum can be easily obtained as a substantially pure product by using a combination of specific crystallizing modifiers, so its industrial value is extremely high.
次に、本発明を実施例によって更に詳細に説明する。Next, the present invention will be explained in more detail by way of examples.
実施例
三水石膏粉末２５ｆと水２２５１からなるスラリーに第
１表に示した媒晶剤を加え、５００ｙｄガラスオートク
レーブ中で５０ Ｏｒｐｍで攪拌を行ないながら、１３
０℃、２．６Ｋｇ／ｃｄＧの条件下２時間反応を行なっ
た。Example The modifier shown in Table 1 was added to a slurry consisting of 25f of gypsum trihydrate powder and 2251ml of water, and the mixture was stirred at 50 Orpm in a 500 yd glass autoclave for 13 hours.
The reaction was carried out for 2 hours at 0° C. and 2.6 Kg/cdG.
反応終了後、９７°Ｃで熱沢過し、９５℃で１時間熱風
乾燥を行なった。After the reaction was completed, the mixture was filtered under hot water at 97°C and dried with hot air at 95°C for 1 hour.
このようにして得た石膏結晶の結晶構造を示差熱分析し
、また、その結晶形状を光学顕微鏡で観察したところ第
１表に示す結果を得た。The crystal structure of the gypsum crystal thus obtained was subjected to differential thermal analysis, and the crystal shape was observed using an optical microscope, and the results shown in Table 1 were obtained.
Claims (1)
１５０℃加熱してα型半水石膏を製造するに際し く１）クエン酸ナトリウム及び／又はコハク酸ナトリウ
ムと （２）硫酸ニッケル及び／又は塩化ニッケルを媒晶剤と
して、該スラリー中に存在させることを特徴とする柱状
α型半水石膏の製法。[Claims] 1. A slurry made of gypsum trihydrate and water is heated under pressure at 110~
When producing α-type hemihydrate gypsum by heating to 150°C, 1) sodium citrate and/or sodium succinate and (2) nickel sulfate and/or nickel chloride are present as modifiers in the slurry. A method for producing columnar α-type hemihydrate gypsum characterized by
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13696975A JPS5834411B2 (en) | 1975-11-14 | 1975-11-14 | General Alphabet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13696975A JPS5834411B2 (en) | 1975-11-14 | 1975-11-14 | General Alphabet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5261198A JPS5261198A (en) | 1977-05-20 |
| JPS5834411B2 true JPS5834411B2 (en) | 1983-07-26 |
Family
ID=15187704
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13696975A Expired JPS5834411B2 (en) | 1975-11-14 | 1975-11-14 | General Alphabet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5834411B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110040991B (en) * | 2019-05-07 | 2020-04-07 | 东北大学 | Method for rapidly preparing short column-shaped calcium sulfate hemihydrate material by using calcium sulfate dihydrate |
-
1975
- 1975-11-14 JP JP13696975A patent/JPS5834411B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5261198A (en) | 1977-05-20 |
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