Name | CALCIUM SULFATE HEMIHYDRATE |
Synonyms | gips GYPSUM Gypsite Phosphogypsum CALCIUM SULFATE CALCINED CALCIUM SULFATE 0.5-WATER CALCIUM SULFATE HEMIHYDRATE CALCIUMSULFATE BINDER CAB 30 |
CAS | 13397-24-5 |
EINECS | 603-783-2 |
InChI | InChI=1/Ca.H2O4S.2H2O/c;1-5(2,3)4;;/h;(H2,1,2,3,4);2*1H2/q+2;;;/p-2 |
Molecular Formula | CaH2O5S |
Molar Mass | 154.16 |
Density | 2.32 |
Melting Point | 1450 °C |
Appearance | Irregular Granules or Chunks |
Color | Blue |
Physical and Chemical Properties | WGK Germany:1 RTECS:WS6920000 |
Risk Codes | R49 - May cause cancer by inhalation R42/43 - May cause sensitization by inhalation and skin contact. R51/53 - Toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment. R68 - Possible risk of irreversible effects R50/53 - Very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment. R60 - May impair fertility |
Safety Description | S53 - Avoid exposure - obtain special instructions before use. S22 - Do not breathe dust. S36/37 - Wear suitable protective clothing and gloves. S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) S60 - This material and its container must be disposed of as hazardous waste. S61 - Avoid release to the environment. Refer to special instructions / safety data sheets. |
UN IDs | UN 3077 9/PG 3 |
WGK Germany | 1 |
RTECS | WS6920000 |
FLUKA BRAND F CODES | 3 |
colorless columnar crystal or white crystalline powder. d 2. 32. Slowly soluble in glycerol, slightly soluble in water, 18 ° C in water solubility of 0.26g/lOOmL water, insoluble in most organic solvents. Some of the water of crystallization is lost in the temperature range of 100 to 150 ° C., and an anhydrous substance can be obtained by heating to above 200 ° C.
calcium carbonate was added to hydrochloric acid while stirring to generate carbon dioxide and form a calcium chloride solution. After filtration, sulfuric acid was added to the filtrate while stirring to form a white precipitate. After heating, the precipitate was washed, centrifuged and dried to obtain calcium sulfate.
for blockers, adhesives, chelating agents and calcium enhancers.
stimulation of the mouth, nose, throat and lungs, resulting in taste, smell attenuation, nostril bleeding. Stored in a closed container.
EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
Application | phosphogypsum is a by-product in wet-process phosphoric acid production. Because of the different production processes, there are phosphorus dihydrate gypsum (CaSO4 · 2H2O) and hemihydrate gypsum (CaSO5 · 1/2H2O). In addition to calcium sulfate, the main components also contain a small amount of undecomposed phosphate rock powder, free phosphoric acid, iron phosphate, aluminum phosphate and fluorosilicate and other impurities. The more pure can be used as a raw material for the manufacture of cement, sulfuric acid, ammonium sulfate and building materials. Can also be used for some alkaline soil, which can be used to water-soluble phosphorus pentoxide, and can improve the soil. Its sulfate is also required for sulfur-deficient soils. used as raw materials for the production of gypsum board, superphosphate fertilizer, can also be used as cement retarder, brick additives, such as |
production method | calcium carbonate was added to hydrochloric acid while stirring to generate carbon dioxide and form a calcium chloride solution. After filtration, sulfuric acid was added to the filtrate while stirring to form a white precipitate. Reheating followed by washing of the precipitate. After heating, the precipitate was washed, centrifuged and dried to obtain calcium sulfate. |