Cadmium sulfate.hydrate

Cadmium sulfate hydrate, 4 515 physical properties of, 4 509t Cadmium sulfate monohydrate, 4 515 physical properties of, 4 509t Cadmium sulfide, 4 503, 515-516, 518, 521 colloidal precipitation color, 7 343t color and bad gap, 7 335t physical properties of, 4 509t piezochromic material, 6 607 Cadmium sulfide photodetectors, 19 137 Cadmium sulfide photoconductor, fabrication and performance of, 19 155-156... 

Calcium sulfate crystals were precipitated in a Continuous Mixed Suspension Mixed Product Removal (CMSMPR) crystallizer by mixing of calcium phosphate and sulfuric acid feed streams. The formed calcium sulfate hydrate (anhydrite, hemihydrate and dihydrate) mainly depends on the temperature and the solution composition. The uptake of cadmium and phosphate ions in these hydrates has been studied as a function of residence time and solution composition. In anhydrite, also the incorporation of other metal ions has been investigated. The uptake was found to be a function of both thermodynamics and kinetics. 

Formula CdS04 MW 208.48 also forms two hydrates, cadmium sulfate monohydrate, CdS04 H20 [7790-84-3] and cadmium sulfate octahydrate, CdS04-8H20 [15244-34-6]. 

Arsenic, barium, benzene, carbon tetrachloride, chromium, 1,2-dichloroethane, dichloromethane, ethylbenzene, toluene, trichloroethene Aluminium, antimony, arsenic, barium, boron, cadmium, chloral hydrate, chromium, copper, dichloroacetate, iron, mercury, zinc Ammonia, sulfate... 

SYNS CADMIUM SULFATE OCTAHYDRATE SULFURIC ACID, CADMIUM SALT, HYDRATE... 

Hydrate. 8/3 moles water per mole cadmium sulfate, odorless, mono clinic crystals. On heating loses water above 40°, [tinning monohydrate by SO. Does not become anhy -dieuson further heating, d 3.08, Freely sol in water almost insol in alcohol, ethyl acetate. LD s.c. in dogs 27 mg/kg, Me Substances List, H. E. Chistensen eta/.. Eds, (1974) p 740. 

Ca2Si04 7/6H20 CALCIUM ORTHOSIUCATE 7/6-HYDRATE 466 CdS04 CADMIUM SULFATE 503... 

Cadmium sulfate [7790-84-3 (for 3CdS04 8H2O), 10124-36-4 (anhydrous)] M 208.4 (anhydrous), 769.5 (hydrate). The sulfate crystallises from distilled water as a hydrate by partial evaporation in a desiccator. It gives the monohydrate on heating at 80°. It is insoluble in EtOH, Me2CO or EtOAc. It forms a white precipitate of Cd(OH)2 with aqueous NH3 which dissolves in excess of NH3 to form soluble [Cd(NH3)4]S04. [Gmelin s Cadmium (8th edn) 33 p 121 1925, Suppl pp 609-610 19591]... 

Wltkamp, G.J., van Rosmalen, G.M. Reduction of cadmium uptake In calcium sulfate hydrates by complexlng agents. In Industrial Crystallization 90 (ed. Mersmann, A.), p. 689, Munich 1990... 

Aluminium potassium sulfate dodecahydrate Aluminium sulfate hydrate <30% aq. sol n Ammonium acetate sat d aq. sol n Ammonium bicarbonate Ammonium carbonate sat d aq sol n Ammonium chloride sat d aq. sol n Ammonium fluoride 30-70% aq. sol n Ammonium hydrogen fluoride Ammonium nitrate Arsenic trichloride Cadmium oxide solid Calcium chloride 30-70% sat d aq. sol n Cobalt sulfate heptahydrate... 

The zinc salt solutions, which currently mainly come from zinc and copper smelters, contain impurities which have to be completely removed prior to use, because all heavy metals form colored sulfides. For the purification step the solution is oxidized with chlorine (pH 4), which precipitates most of the iron and manganese as the oxide-hydrate and part of the cobalt, nickel and cadmium present as their hydroxides. In the second step, the elements nobler than zinc (Ni, Co, Cd, In, Tl, Pb, Cu, Ag) are precipitated as their metals by adding zinc dust and the metals returned to the copper smelters for noble metal extraction. After purification the solutions are adjusted to a particular zinc content. Mixtures of zinc sulfate and zinc chloride solutions are used for manufacturing lithopone types with more than 30% ZnS. 

Impurities and trace elements. The major impurities in hydrated lime are calcium carbonate, calcium oxide and magnesium oxide. Minor impurities include silica, alumina, iron oxide and calcium sulfate. Their significance depends on the use to which the hydrated lime is put. As with quicklime (section 13.2) high levels of toxic substances (lead, antimony, arsenic, cadmium, chromium, nickel and selenium) can prevent the use of a hydrated lime in applications such as treatment of water for human consumption [19.8], in foodstuffs and the production of toothpaste (e.g., sections 28.1.8, 30.4, 30.8, 30.9, and parts of chapter 31). 

Methyl vinyl ketone is synthesized industrially by the hydration of vinylacetylene. The reaction is catalyzed by acetates, formates, or sulfates of mercury, silver, cadmium, copper, or zinc in the presence of acids [329,330]. The oxidation of 1-butene to methyl vinyl ketone in 72% yield by the formation of olefin mercuric salt complexes followed by the decomposition of these complexes with acid may become commercially feasible [331]. 

Additionally, two cadmium chromates are known (classed with chromate pigments) along with a cadmium tungstate (classed with tungsten pigments). Lithopone forms - that is, pigments coprecipitated with barium sulfate (q.v.) - of the cadmium sulfides are also extant. The composition of cadmium white mentioned in later nineteenth cenmry literature is not well known Salter (1869) describes it as a hydrated oxide or carbonate of cadmium. 

Zinc chromates group Zinc oxides and hydroxides group Zinc sulfides group Aurichalcite Cadmium zinc sulfide Claraite Cobalt zinc oxide Copper zinc carbonate, rosasite type Franklinite Iron zinc oxide Iron zinc oxide Lead antimony zinc oxide Matraite Rosasite Smithsonite Sphalerite Wurtzite Zinc carbonate Zinc carbonate hydroxide Zinc dichromate hydrate Zinc hexacyanoferrate(II) Zinc oxide Zinc oxide sulfide Zinc phosphate Zinc potassium chromate Zinc potassium chromate hydrate Zinc sulfate Zinc sulfide Zinc sulfide hydrate Zinc titanate Zincite Blende Mosaic gold Murexide Bieganska et al. (1988) Merck Index (1996)... 

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