SU791217A3 - Method of producing calcium sulfate alpha-semihydrate - Google Patents

Method of producing calcium sulfate alpha-semihydrate Download PDF

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Publication number
SU791217A3
SU791217A3 SU752135316A SU2135316A SU791217A3 SU 791217 A3 SU791217 A3 SU 791217A3 SU 752135316 A SU752135316 A SU 752135316A SU 2135316 A SU2135316 A SU 2135316A SU 791217 A3 SU791217 A3 SU 791217A3
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SU
USSR - Soviet Union
Prior art keywords
hours
sodium citrate
hemihydrate
semihydrate
calcium sulfate
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SU752135316A
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Russian (ru)
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Цунееси Кикудзи
Кубо Киодзи
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Мицубиси Дзюкогио Кабусики Кайся (Фирма)
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    • 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
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B11/00—Calcium sulfate cements
    • C04B11/02—Methods and apparatus for dehydrating gypsum
    • C04B11/024—Ingredients added before, or during, the calcining process, e.g. calcination modifiers

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Inorganic Chemistry (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)

Abstract

1486966 Calcium sulphate alpha-hemihydrate MITSUBISHI JUKOGYO KK 15 May 1975 [15 May 1974] 20699/75 Heading ClA Calcium sulphate alpha-hemihydrate is produced from gypsum in a continuous process in which a CaSO 4 .2H 2 O slurry is heat treated with water under pressure in the presence of no more than 0À1% by weight of sodium citrate, based on the total weight of the gypsum, at a temperature of not lower than 140‹ C. wherein the average retention time of the slurry in the process is more than 0À5 hours but not more than 2 hours and preferably from 1 to 1À5 hours. Comparative examples of a batch process both with and without sodium citrate are given in addition to an example of the process described above.

Description

Изобретение относитс  к способу . превращени  суспензии CaS042H2iO в ot-полугидрат с помощью термообработки водой под давлением, который 5 вследствие незначительного расширени  и усадки после схватывани  и отверждени  широко примен етс  в качестве формующего материала в автомобильной и самолетостроительной 10 промышленности.The invention relates to a method. converting the CaS042H2iO slurry into ot-hemihydrate by heat treatment with water under pressure, which, 5 due to slight expansion and shrinkage after setting and curing, is widely used as a forming material in the automotive and aircraft manufacturing industry 10.

Известен способ получени  oL-полугидрата сульфата кальци  путем термообработки водной суспензии CaS04-2H2 0 под давлением 1,5-7 атм 5 при температуре 110-160°С в присутствии добавок, например ПАВ, дикарбоновых кислот или их солей.Далее гор чую суспензию центрифугируют и влажный центрифугированный продукт 20 подвергают сушке при 120-180с и последугадему дозреванию в течение до 4 ч A method of producing calcium sulfate oL-hemihydrate is known by heat treating an aqueous suspension of CaS04-2H2 0 under a pressure of 1.5-7 atm 5 at a temperature of 110-160 ° C in the presence of additives, such as surfactant, dicarboxylic acids or their salts. Further, the hot suspension is centrifuged and the wet centrifuged product 20 is dried at 120-180s and then matured for up to 4 hours

Известен также способ получени  сб-полу гидрат а сульфата кальци , за- 25 ключающийс  в том, что двуводный сульфат кальци  смешивают с цитратом натри , брикетируют и полученные брикеты под давлением в течение 2 ч подвергают термообработке в ат- КЗThere is also known a method for producing sab-hemihydrate and calcium sulphate, which consists in mixing calcium sulphate with sodium citrate, briquetting and pressurized briquettes obtained under pressure for 2 hours.

мосфере. насыщенного при 140-150° С вод ного пара f2.mosphere. water vapor f2 saturated at 140-150 ° С.

Недостатком выиеуказанных способов  вл етс  то, что они периодические ..The disadvantage of these methods is that they are periodic ..

Цель изобретени  - обеспечение непрерывности процесса.The purpose of the invention is to ensure the continuity of the process.

Поставленна  цель достигаетс  способом получени  об-полугидрата CaS04- путем дегидратации CaSO 2Н20 при 140-15СРс под давлением в присутствии цитрата натри , вз того в количестве от следов до 0,1% от веса СаЗОд .This goal is achieved by the method of obtaining CaS04-hemihydrate by dehydrating CaSO 2 Н20 at 140–15СРс under pressure in the presence of sodium citrate, taken in the amount of from traces to 0.1% by weight of saOzd.

Способ осуществл етс  следующим образе.The method is carried out as follows.

Смешивают Са5042Н,0, цитрат натри  и воду и полученную суспензию подвергают термообработке в автоклаве гор чей водой с температурой выше 140с. При этом врем  выдержки суспензии в автоклаве составл ет 0,5-2 ч, предпочтительно 1-1,5 ч. Далее суспензию полученного СаЗОд.- OjSHjO сгущают, сушат и высушенный продукт измельчают.Ca5042H, 0, sodium citrate and water are mixed and the resulting suspension is heat treated in an autoclave with hot water with a temperature above 140 s. At the same time, the suspension time in the autoclave is 0.5-2 h, preferably 1-1.5 h. Next, the suspension of CALDW. -OjSHjO is concentrated and dried, and the dried product is crushed.

Пример. Суспензию CaS04 х X 2Н20 подвергают термообработке в .автоклаве гор чей водой с температурой при концентрации суспензии 10 вес.% и концентрации цитрата натри  0,005 вес.%.Example. The CaS04 x X 2H20 suspension is heat treated in an autoclave with hot water at a concentration of the suspension of 10% by weight and a concentration of sodium citrate of 0.005% by weight.

Суспензию из автоклава вывод т с такой скоростью, чтобы выдержка ее в автоклаве составл ла 1 ч.Дальше суспензию СаЗОд- 0,5HjO направл$5ют под давлением в жидкостной циклон и сконцентрированную ее затем сушат и измельчают. В таблице представлены результаты испытани  продукта на прочность.The suspension from the autoclave is removed at such a rate that its exposure in the autoclave is 1 hour. Next, the SazOd-0.5HjO suspension is directed under pressure into the liquid cyclone and concentrated it is then dried and crushed. The table presents the results of testing the strength of the product.

Отличительным признаком предлагаемого способа  вл етс  ведение процесса в присутствии указанногоA distinctive feature of the proposed method is to conduct the process in the presence of the indicated

количества цитрата натри . При увеличении его ныне указанного диапазо на конверси  в Ы CaS04 О, 5Н,2,0 происходит при обычной периодической работе, а при непрерывной работе конверси  происходит незначительно или совсем не идет.amounts of sodium citrate. With an increase in its currently specified range in the conversion in S CaS04 O, 5H, 2.0 occurs during normal periodic operation, and during continuous operation, the conversion occurs slightly or not at all.

Claims (2)

1. Патент ЧССР 139974, кл 8 ОВ 6/Р2, 1971.1. The patent of Czechoslovakia 139974, class 8 OV 6 / P2, 1971. 2. Патент Великобритании 1262083, кл. С 1А, 1972.2. Patent of Great Britain 1262083, cl. C 1A, 1972.
SU752135316A 1974-05-15 1975-05-15 Method of producing calcium sulfate alpha-semihydrate SU791217A3 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP49053187A JPS593406B2 (en) 1974-05-15 1974-05-15 Alpha-Gatahansuisetsukou

Publications (1)

Publication Number Publication Date
SU791217A3 true SU791217A3 (en) 1980-12-23

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ID=12935858

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Application Number Title Priority Date Filing Date
SU752135316A SU791217A3 (en) 1974-05-15 1975-05-15 Method of producing calcium sulfate alpha-semihydrate

Country Status (5)

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JP (1) JPS593406B2 (en)
DE (1) DE2522005A1 (en)
FR (1) FR2271185B1 (en)
GB (1) GB1486966A (en)
SU (1) SU791217A3 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2053874B (en) * 1977-12-29 1982-07-28 Idemitsu Kosan Co Production of calcium sulphate
CN107746195B (en) * 2017-02-06 2020-05-01 宁夏博得石膏科技有限公司 Method for efficiently producing α type semi-hydrated gypsum

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IE36901B1 (en) * 1971-09-15 1977-03-16 Giulini Gmbh Geb Process for treatment of alpha - calcium sulphate semi-hydrate

Also Published As

Publication number Publication date
DE2522005A1 (en) 1976-04-08
FR2271185A1 (en) 1975-12-12
JPS593406B2 (en) 1984-01-24
JPS50145393A (en) 1975-11-21
FR2271185B1 (en) 1980-11-14
GB1486966A (en) 1977-09-28

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