METHOD OF PURIFYING BADDELEYITE CONCENTRATE Russian patent published in 2009 - IPC C01G25/02 C22B3/10 C22B3/08 

FIELD: chemistry.

SUBSTANCE: present invention relates to the method of purifying baddeleyite concentrate. The method involves treatment of baddeleyite with concentrated sulphuric acid while heating, obtaining a solid sulphatisation product, which is turned into pulp using water. Purified baddeleyite concentrate is gravitationally separated from the pulp. A hydrated residue is also separated from the sulphuric acid solution, containing rare elements and impurity components. The method is distinguished by that, the baddeleyite concentrate is subjected to pre-treatment with dilute 2-7% sulphuric or hydrochloric acid at temperature 40-60°C with transfer of part of impurity components into the solution and formation of a residue of baddeleyite concentrate, which is separated from the sulphuric acid or hydrochloric acid solution, washed with water and subjected to magnetic separation, obtaining pre-purified baddelyite concentrate. The concentrate is then treated with concentrated 93-96% sulphuric acid at temperature 180-200°C. After separation of the baddeleyite concentrate, the sulphuric acid solution is neutralised with lime milk.

EFFECT: higher degree of purifying baddeleyite concentrate from phosphorous, iron and silicon with provision for high degree of purity from radioactive impurities, as well as increased concentration of tantalum and niobium and reduced content of impurities in the obtained rare metal concentrate.

3 cl, 4 ex