anhydrite
Calcium sulfate
CAS: 7778-18-9
Molecular Formula: Ca.O4S
anhydrite - Names and Identifiers
| Name | Calcium sulfate |
| Synonyms | anhydrite anhydrousgypsum Calcium sulfate naturalanhydrite anhydroussulfateoflime anhydrouscalciumsulfate sulfatedecalcium,anhydre calciumsulfate,anhydrous calciumsulfate(anhydrous) |
| CAS | 7778-18-9 |
| EINECS | 231-900-3 |
| InChI | InChI=1/Ca.H2O4S.2H/c;1-5(2,3)4;;/h;(H2,1,2,3,4);;/p-2/rCaH2.H2O4S/c;1-5(2,3)4/h1H2;(H2,1,2,3,4)/p-2 |
anhydrite - Physico-chemical Properties
| Molecular Formula | Ca.O4S |
| Molar Mass | 136.14 |
| Density | 2.960 |
| Melting Point | 1450 °C |
| Water Solubility | Soluble in water. |
| Solubility | 2g/l |
| Appearance | White powder |
| Specific Gravity | 2.96 |
| Color | White |
| Exposure Limit | ACGIH: TWA 10 mg/m3OSHA: TWA 15 mg/m3; TWA 5 mg/m3NIOSH: TWA 10 mg/m3; TWA 5 mg/m3 |
| Merck | 14,1706 |
| Storage Condition | Store at RT. |
| Stability | Stable. Incompatible with aluminium, strong acids. |
| Sensitive | Moisture Sensitive |
| MDL | MFCD00010912 |
| Physical and Chemical Properties | |
| Use | For building materials and cement production |
anhydrite - Risk and Safety
| 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. R36/37 - Irritating to eyes and respiratory system. R68 - Possible risk of irreversible effects R60 - May impair fertility R50/53 - Very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment. |
| 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. S24/25 - Avoid contact with skin and eyes. S36 - Wear suitable protective clothing. S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 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 |
| TSCA | Yes |
| HS Code | 28332980 |
| Hazard Class | 9 |
anhydrite - Upstream Downstream Industry
| Raw Materials | Sulfuric acid Sulfuric acid Calcium carbonate |
| Downstream Products | calcium sulfate hemihydrate Bacillus thuringiensis Calcium Naphthenate |
anhydrite - Reference
| Reference Show more | 1. [IF=3.196] Yue He et al."Infrared spectroscopic identification of mineral drugs in herbal preparations with thermogravimetry-guided thermal separation–A case study of alum in a herbal powder for oral ulcer."J Mol Struct. 2022 Feb;1249:131581 |
anhydrite - Nature
Open Data Verified Data
There are three types of water free type, semi water type and two water type. Two water whiskers are easy to wind, about 110 degrees Celsius dehydration into amorphous calcium sulfate powder, semi-water strength between the two, 160 degrees Celsius dehydration, so industrial calcium sulfate whisker is anhydrous calcium sulfate whisker. Anhydrous calcium sulfate is a white loose needle. The relative density is 2. 96, the melting point is 1450 ℃, the heat resistance is 1000 ℃, and the average aspect ratio is generally 50~80. Calcium sulfate whiskers are slightly soluble in water and neutral in aqueous solution. With the fineness of granular filler, short fiber filler length diameter ratio, high temperature resistance, acid and alkali resistance, chemical corrosion resistance, good toughness, good electrical insulation, high strength, easy surface treatment, and resin, plastic, rubber compatibility is good, can be evenly dispersed, the pH value is close to neutral. Excellent enhancement and flame retardancy. Compared with other inorganic whiskers, calcium sulfate whiskers have lower toxicity.
Last Update：2024-01-02 23:10:35
anhydrite - Preparation Method
Open Data Verified Data
with calcium sulfate dihydrate as raw material, the suspension formed by dissolving in water is continuously stirred in a closed reaction kettle, heated to a certain temperature, and calcium sulfate whiskers are obtained after reaching a certain pressure. Or at a certain temperature, the high concentration of calcium sulfate dihydrate in acidic solution into needle-like or fibrous whiskers.
Last Update：2022-01-01 09:06:06
anhydrite - Standard
Authoritative Data Verified Data
This product is prepared by the reaction of calcium carbonate and sulfuric acid or calcium chloride solution and soluble sulfate. The content of caso4 shall not be less than 99.0%, calculated on the basis of ignition products.
Last Update：2024-01-02 23:10:35
anhydrite - Trait
Authoritative Data Verified Data
- This product is white powder; Odorless, tasteless.
- This product is slightly soluble in water and insoluble in ethanol.
Last Update：2022-01-01 11:26:38
anhydrite - Use
Open Data Verified Data
can be used for building materials, thermal insulation materials, coatings, reinforced materials, etc. It is used in the paper industry and may replace part or most of the pulp. The aspect ratio of less than or equal to 50 can be used as a high-grade filler for paper, which can greatly increase the yield of paper, reduce wood consumption, and help protect the environment and reduce wastewater pollution. In the chemical industry can be made to enhance the material, anhydrous sulfuric acid whisker can be used in plastic granulation, to enhance the strength of plastic particles, high temperature resistance, and reduce costs. In polyvinyl chloride, polyethylene, propylene, polystyrene and other plastic production can enhance the performance of all aspects of the product, improve fineness, dimensional stability, surface finish, tensile strength, bending strength, bending elasticity and heat distortion temperature, and reduce the wear of equipment. Calcium sulfate whisker has good friction, heat preservation, heat insulation, fire prevention, non conductor insulation and other properties, can replace asbestos as friction material, thermal insulation material and fire (flame retardant) material. As an asphalt filler, the softening point of asphalt can be significantly increased.
Last Update：2022-01-01 09:06:07
anhydrite - Differential diagnosis
Authoritative Data Verified Data
take this product, add dilute hydrochloric acid to dissolve, and the solution shows the identification reaction of calcium salt and sulfate (General rule 0301).
Last Update：2022-01-01 11:26:38
anhydrite - Safety
Open Data Verified Data
The packaging bag should be of sufficient strength to prevent breakage. The net weight of each bag is 25kg or 50kg, and the allowable error is 5%. But each batch of products in any sample of 50 bags, the average weight should not be less than 25kg or 50kg. The product logo should be printed on the packaging bag. Product Certificate shall be attached to each batch of product. Rain-proof and moisture-proof shall be paid attention to during transportation and storage.
Last Update：2022-01-01 10:58:15
anhydrite - Exam
Authoritative Data Verified Data
pH
take 1.5g of this product, add 15ml of water, shake for 5 minutes, place for 5 minutes, filter; Take 10ml of continued filtrate, add sodium hydroxide titration solution (0.Olmol/L) 0.25, with phenolphthalein indicator solution O.lml, should be red, plus hydrochloric acid titration solution (0.01mol/L)0.30, the strain is colorless, plus methyl red indicator solution 0.2ml, should be orange red.
chloride
take 0.50g of this product, add nitric acid solution (1-2 )5ml and water 40ml, shake to dissolve, check according to law (General rule 0801 ) , and standard sodium chloride solution 9.0ml of the control solution should not be more concentrated (0.018%).
carbonate
take l.Og of this product, add 5ml of water, mix well, Dropwise add dilute hydrochloric acid, do not bubble boiling.
ignition weight loss
take l.Og of this product, burn to constant weight at 700~800°C, and the weight loss should be 19.0% ~ 23.0%.
Iron Salt
take 0.20g of this product, add 50mg of ammonium persulfate and 10ml of dilute hydrochloric acid, shake and dissolve it, dilute it with water to make it 50ml, add 5.0 of ammonium thiocyanate test solution, shake well, inspection according to law (General rule 0807 ) , and the standard solution 0.01% ml with the same method of preparation of the control solution, shall not be deeper ().
Heavy metals
take 2.5g of this product, add 2ml of hydrochloric acid and 15ml of water, heat to boiling, cool, add 2 drops of phenolphthalein indicator solution, add concentrated ammonia solution Dropwise until the color of the solution turns to pink, add 0.5ml of glacial acetic acid, dilute to 25ml with water, filter, take 12ml of filtrate as test solution; Take 2ml of filtrate, add 1.0ml of standard lead solution, dilute to 12ml with water, as a control solution, 2ml of the filtrate was taken and 10ml of water was added as a blank solution. Put the above three kinds of solutions in 25ml Nessler's colorimetric tube, add acetate buffer (pH3.5 )2ml, shake, add thioacetamide test solution 1.2ml, shake, and place for 2 minutes. The color of the blank solution should be lighter than that of the control solution. If the test solution is colored, it should not be deeper (0.001%) compared with the control solution.
arsenic salt
take 10% g of this product, add 0822 hydrochloric acid solution, place 50°C water bath for 5 minutes to dissolve, add hydrochloric acid and water, and check according to law (General rule method 1), the provisions (0.001%) shall be met.
Last Update：2022-01-01 11:26:39
anhydrite - Content determination
Authoritative Data Verified Data
take this product about 0.2g, precision weighing, add dilute hydrochloric acid 10ml and water 100ml, heat and shake to dissolve, cool, with stirring, add 20M L of ethylenediamine tetraacetic acid disodium titration solution (0.05mol/l), shake well, and add 15ml of sodium hydroxide solution (1-5) and calcium red indicator O.lg, followed by ethylenediamine tetraacetic acid disodium titration solution (0.05mol/L) titration to the solution from purple to blue. Each 1 ml of ethylenediamine tetraacetic acid disodium titration solution (0.05mol/L) is equivalent to 6.807mg of cas04.
Last Update：2022-01-01 11:26:40
anhydrite - Category
Authoritative Data Verified Data
pharmaceutical excipients, diluents.
Last Update：2022-01-01 11:26:40
anhydrite - Storage
Authoritative Data Verified Data
light shielding, sealed storage.
Last Update：2022-01-01 11:26:40
anhydrite - Reference Information
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| content analysis | preparation of calcium reagent 10g of sodium chloride dried at 105-108 ℃ for 2H was weighed, and then it was finely ground in a mortar, then weigh 0.1g Calcium, mix with sodium chloride in the same mortar, store in brown bottle with lid. Weigh 0.1g (weigh to 0.0002g) of sample dried to constant weight at 250 ℃, put it in a 300ml Erlenmeyer flask, add 4ml of hydrochloric acid test solution (TS-117), 20ml of water, heat and dissolve, add 1 drop of Methyl red test solution (TS-149), add 10% potassium hydroxide solution Dropwise to be orange red, and excess 5ml, add 2:3 triethanol ammonium solution 10m] and a small amount of calcium reagent, titrate with 0.05mol/L EDTA disodium solution until the solution changes from wine red to pure blue. Calculated content (CaS(). (%) where c-concentration of disodium EDTA standard solution, mol/L;V-volume of disodium EDTA standard solution consumed, ml;W-mass of sample, g;0.136l-millimolar mass of calcium sulfate, g/mol. |
| toxicity | is almost non-toxic (both ions are body components, solubility is also low). GRAS(FDA,§ 184.1230,2000). ADI is not restrictive (FAO/WHO,2001). ADI is not restricted (EEC,1990). |
| usage limit | GB 14880-94, same as "01202, calcium glycerophosphate". GB 2760-1996: Flour treatment 1.5g./kg: GMP of soy products; Diluent of benzoyl peroxide, not limited. As a coagulant in food processing. For the production of tofu, soybean per liter to add about 14~20g in soy milk (excessive bitterness will occur). Add 0.15% in wheat flour, used as yeast food, dough regulator. Added to canned tomato and potato as a tissue enhancer. Hardener with water for brewing (beer). Wine flavor enhancer. FAO/WHO(1984,mg/kg) Shannon cheese, cream mixture for 5g/kg; Canned tomato, 800 pieces, self-contained 450 (single or combined with other curing agents, in Ca). FDA,§ 184.1230 (%): baked goods 1.3; Confectionery and frosting 3.0; Frozen dairy confection (or dry powder) 0.5; Gelatin and pudding products 0.4; Cereal products and noodles 0.5; processed vegetables 0.35; Other food 0.07. BATF,27 CFR § 240.1051, maximum 2G/L. According to Japanese regulations, the maximum usage is less than or equal to 1%(Ca) or less than 4.30% of this product. |
| Use | curing agent; Drying agent; Flour treatment agent; Forming aid; Bulking agent; pH regulator; Processing aid; Stabilizer; tissue improvers; Thickeners; Pigments; Nutritional supplements (calcium fortification); Yeast food; Dough conditioners; Chelating agents. mainly used in the production of cement and other building materials used as analytical reagent and hygroscopic agent China's provisions for flour treatment agent (as a benzoyl peroxide diluent), the maximum use of 1.5g/kg; as a coagulant, it can be used in soybean products and canned foods according to the production needs. construction materials and cement production are the same as gypsum ". |
| production method | is the same as "gypsum". The natural gypsum ore is removed from impurities and mixed soil, and calcined and crushed to obtain a finished product. From natural gypsum ore in addition to the net impurities, soil in the electric furnace heated to 300 deg C calcined powder obtained. Sodium sulfate was added to calcium chloride, a by-product of the ammonia-alkali method, and the product was refined. By-products in the production of organic acids. For example, calcium oxalate obtained in the production of oxalic acid is purified by decomposition with sulfuric acid. |
| category | toxic substances |
| explosive hazard characteristics | the mixed reaction with diazomethane exothermic and explosive; auto-ignition at high temperature |
| flammability hazard characteristics | toxic sulfur oxide smoke emitted by thermal decomposition; A pollution dust |
| storage and transportation characteristics | low temperature ventilation and drying |
| extinguishing agent | Water |
| Occupational Standard | TWA 15 mg/m3 (total dust) |
| toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |
Last Update：2024-04-10 22:29:15
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Raw Materials for anhydrite
Downstream Products for anhydrite