GB1316371A - Process for the purification of gypsum - Google Patents

Process for the purification of gypsum

Info

Publication number
GB1316371A
GB1316371A GB4792570A GB4792570A GB1316371A GB 1316371 A GB1316371 A GB 1316371A GB 4792570 A GB4792570 A GB 4792570A GB 4792570 A GB4792570 A GB 4792570A GB 1316371 A GB1316371 A GB 1316371A
Authority
GB
United Kingdom
Prior art keywords
water
gypsum
suspension
hydro
aliphatic
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
Application number
GB4792570A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BK Giulini Chemie GmbH
Original Assignee
Giulini Gebrueder GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Giulini Gebrueder GmbH filed Critical Giulini Gebrueder GmbH
Publication of GB1316371A publication Critical patent/GB1316371A/en
Expired legal-status Critical Current

Links

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
    • C01F11/468—Purification of calcium sulfates

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Inorganic Chemistry (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

1316371 Process for purification of gypsum GIULINI GmbH Gebr. 8 Oct 1970 [8 Oct 1969] 47925/70 Heading C1A Impure gypsum containing inorganic or organic, water-soluble or water-insoluble impurities is purified by subjecting an aqueous suspension of the gypsum to hydro separation at a pH of not more than 2À5 in the presence of a water-miscible or water-immiscible organic reagent. The hydro separation is preferably effected at a temperature of 5‹ to 60‹ C. at a gypsum slurry concentration of from 50 to 650 g. of dry gypsum per litre of suspension. The hydro separation process may be carried out using water passing either in the same direction or counter to the flow of the aqueous gypsum suspension. Examples of suitable hydro separators are upcurrent bowl classifiers, decanting centrifuges, flotation devices, concentrators, zig-zag and countercurrent washers. Suitable water-miscible organic reagents include oxygen containing compounds such as watersoluble aromatic, aliphatic or cyclic mono- or polyhydric C 1 -C 6 alcohols, water-soluble polyalcohols, sulphonates or sulphates, ketones, ethers, nitro compounds and methylated polyalcohols, e.g. methyl celluloses. Examples of the water-immiscible organic reagents are oxygen-containing water-immiscible-compounds such as aliphatic, aromatic and cyclic mono- or polyhydric C 4 -C 20 alcohols and aliphatic, aromatic or cyclic C 6 -C 20 hydrocarbons. The pH of the aqueous gypsum suspension is adjusted by the addition to it of from 0À2 to 20 kg. of strong acid (based on 100% acid) per 1 m<SP>3</SP> of suspension. The pH is preferably adjusted by adding sulphuric acid, but other acids such as nitric or monochloroacetic acid may be used. The process is carried out in one or more sequentially connected or parallel connected stages.
GB4792570A 1969-10-08 1970-10-08 Process for the purification of gypsum Expired GB1316371A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691950658 DE1950658B2 (en) 1969-10-08 1969-10-08 Process for cleaning waste gypsum from the chemical industry

Publications (1)

Publication Number Publication Date
GB1316371A true GB1316371A (en) 1973-05-09

Family

ID=5747606

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4792570A Expired GB1316371A (en) 1969-10-08 1970-10-08 Process for the purification of gypsum

Country Status (7)

Country Link
JP (1) JPS5518658B1 (en)
BE (1) BE757189A (en)
DE (1) DE1950658B2 (en)
FR (1) FR2064195B1 (en)
GB (1) GB1316371A (en)
NL (1) NL7012462A (en)
YU (1) YU33657B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2617480C2 (en) * 2015-08-26 2017-04-25 Федеральное государственное бюджетное образовательное учреждение высшего образования "Комсомольский-на-Амуре государственный технический университет" (ФГБОУ ВО "КнАГТУ") Method for manufacturing construction materials
RU2618550C1 (en) * 2016-03-17 2017-05-04 Федеральное государственное бюджетное образовательное учреждение высшего образования "Комсомольский-на-Амуре государственный технический университет" (ФГБОУ ВО "КнАГТУ") Construction materials manufacturing method

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102765741B (en) * 2012-07-18 2014-04-02 浙江天蓝环保技术股份有限公司 Separating and purifying device and method of white mud/carbide slag-gypsum process desulphurization gypsum slurry
CN113213521A (en) * 2021-05-12 2021-08-06 昆明理工大学 Method for enhancing whiteness of waste gypsum

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2617480C2 (en) * 2015-08-26 2017-04-25 Федеральное государственное бюджетное образовательное учреждение высшего образования "Комсомольский-на-Амуре государственный технический университет" (ФГБОУ ВО "КнАГТУ") Method for manufacturing construction materials
RU2618550C1 (en) * 2016-03-17 2017-05-04 Федеральное государственное бюджетное образовательное учреждение высшего образования "Комсомольский-на-Амуре государственный технический университет" (ФГБОУ ВО "КнАГТУ") Construction materials manufacturing method

Also Published As

Publication number Publication date
NL7012462A (en) 1971-04-14
BE757189A (en) 1971-03-16
FR2064195B1 (en) 1973-01-12
DE1950658B2 (en) 1975-05-22
YU245470A (en) 1977-06-30
DE1950658A1 (en) 1971-04-15
YU33657B (en) 1977-12-31
JPS5518658B1 (en) 1980-05-20
FR2064195A1 (en) 1971-07-16

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Legal Events

Date Code Title Description
PS Patent sealed
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee