GB1316371A - Process for the purification of gypsum - Google Patents
Process for the purification of gypsumInfo
- 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
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.
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)
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)
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 |
-
0
- BE BE757189D patent/BE757189A/en unknown
-
1969
- 1969-10-08 DE DE19691950658 patent/DE1950658B2/en active Granted
-
1970
- 1970-08-24 NL NL7012462A patent/NL7012462A/xx unknown
- 1970-10-05 FR FR7035880A patent/FR2064195B1/fr not_active Expired
- 1970-10-06 YU YU245470A patent/YU33657B/en unknown
- 1970-10-08 JP JP8871870A patent/JPS5518658B1/ja active Pending
- 1970-10-08 GB GB4792570A patent/GB1316371A/en not_active Expired
Cited By (2)
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 |