Procedure for the obtaining of tin compounds from minerals, concentrates of mineral, slags and similar, containing tin. (Machine-translation by Google Translate, not legally binding)

摘要

Tin is extracted from ores, concentrates or slags by mixing the tin bearing material with at least 1À1 times the stoichiometric amount of calcium chloride required for the production of stannous chloride and in the presence of a carbon containing material, the mixture is heated in a rotary kiln by shell burners (or, in a laboratory kiln, with electric heaters simulating shell burners) to volatilize the tin chloride which is absorbed in water or aq. acid and the tin is recovered as an oxide, hydroxide or oxychloride by precipitation with calcium hydroxide and/or calcium carbonate and the calcium chloride which is recovered is recycled. Sulphides contained in the tin bearing material may be removed by roasting in a fluidized bed or by froth flotation. The raw material may be pelletized at # 40 C. with the required amount of CaCl 2 and carbonaceous material, and then dried, before entering the kiln. The precipitation of Sn is preferably carried out with Ca(OH) 2 at # 60 C. When the raw material contains slag forming materials, e.g. SiO 2 , chlorination part of the CaCl 2 may be replaced by NaCl.