Assertion: cassiterite's iron | /r/CapableOf | leach out treated material
Facets:
value: into an alkali metal stannate salt
type: OTHER
Source sentences:
text: The process of treating tin ore, which comprises heating the ore during a controlled period of time above 550° and below 800° C. in a strongly reducing atmosphere and in the presence of enough sulphur so that stannous sulphide and metallic tin are formed and so that the iron in the final product is in the form of its sulphide stable at the reaction temperature, and under such conditions to insure that tin sulphide is not volatilized; cooling said treated material under non-oxidizing conditions; leaching out the treated material with a solution of an alkaline metal hydroxide in the presence of enough oxygen to transform (1) substantially completely metallic tin into an alkali metal stannate salt, and (2) stannous sulphide into an alkali metal stannate salt and a salt of alkali metal, tin and sulphur; and precipitating a tin compound from this solution.