METHOD OF PROCESSING OF BERTRANDITE-PHENACITE-FLUORITE CONCENTRATES Russian patent published in 2008 - IPC C01F3/00 C01F3/02 

FIELD: chemistry.

SUBSTANCE: method of processing of bertrandite-phenacite-fluorite concentrates comprises concentrate sulphatisation with sulfuric acid at temperature 250÷300°C, water leaching of sulfated concentrate, separation of derived slurry to beryllium sulfate solution and slightly soluble cake, cake rinsing with water from beryllium sulfate solution, separation of derived slurry to cleansing solution and slightly soluble cake. Beryllium hydroxide is precipitated from beryllium sulfate solution joined with cleansing solution and ammonia water, and then it is separated from waste mother solution of ammonia sulfate. The waste mother solution of ammonia sulfate is treated with lime milk on the basis of 11÷13 g calcium oxide for 1 g of beryllium in beryllium hydroxide, derived slurry is maintained during 50÷70 min at temperature 95÷100°C up to the gaseous ammonia exhalation from the solution and gypsum slurry formation. Further ammonia is absorbed and gypsum slurry is separated to gypsum and solution which is get back to closed cycle of leaching, cake rinsing and ammonia absorbing.

EFFECT: filling of environmentally harmful solution from the stage of beryllium hydroxide precipitation is excluded since this solution is get back to closed cycle of sulfated concentrate leaching.

1 ex, 1 dwg