Ferrous cadmium sulphate

For some non-ferrous metals (copper, lead, nickel) the attack by sulphuric acid is probably direct with the formation of sulphates. Lead sulphate is barely soluble and gives good protection. Nickel and copper sulphates are deliquescent but are gradually converted (if not leached away) into insoluble basic sulphates, e.g. Cu Cu(OH)2)3SO4, and the metals are thus protected after a period of active corrosion. For zinc and cadmium the sulphur acids probably act by dissolution of the protective basic carbonate film. This reforms, consuming metal in the process, redissolves, and so on. Zinc and cadmium sulphates are formed in polluted winter conditions whereas in the purer atmospheres of the summer the corrosion products include considerable amounts of oxide and basic carbonate. ... 

E. P. Alvarez 2 found that the pemitrates react with soln. of lead acetate (white precipitate), silver nitrate (white precipitate), mercurous nitrate (white precipitate with rapid decomposition), mercuric chloride (red precipitate), copper sulphate (blue precipitate), zinc and cadmium sulphates (white precipitate), bismuth nitrate (white precipitate), gold chloride (slight effervescence and escape of oxygen), manganous chloride (pink precipitate), nickelous chloride or sulphate (greenish-white precipitate), cobaltous nitrate and chloride (pink precipitate), ferrous sulphate (green or bluish-green precipitate), ferric chloride (red ferric hydroxide), and alkaline earth chlorides (white precipitates). The precipitates are all per-salts of the bases in question. 

Stortenbeker bas also studied the mixed crystals formed by cadmium sulphate and ferrous sulphate by zinc sulphate and magnesium sulphate by magnesium sulphate and ferroiis sulphate by copper sulphate and manganese sulphate by cobalt chloride and manganese chloride. We shall limit ourselves to referring the reader to these valuable memoirs. 

Solubility of Mixed Crystals of Cadmium Sulphate and Ferrous Sulphate in Water at 25°. 

Over the years, copper metal production stopped for economic reasons, but numerous other products were added for environmental reasons and to maximize economic return from the concentrates treated. In many cases, technical innovation played a significant role in developing the required processes. The list of products sold today includes zinc, lead, silver, gold, indium, germanium, bismuth, cadmium, calomeL sulphuric acid, liquid sulphur dioxide, ammonium sulphate f tilizers, coppa sulphate, coiqier arsenate, sodium antimonate and ferrous granules. 

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