METHOD OF BRAZILITE CONCENTRATE PURIFICATION Russian patent published in 2009 - IPC C01G25/02 

FIELD: chemistry.

SUBSTANCE: mixing of brazilite concentrate with concentrated sulphuric acid, its sulphatisation with heating, formation of pulp by processing sulphatisation product with liquid reagent, separating of brazilite from pulp are carried out; mixing of brazilite concentrate and suphuric acid is carried out with weight ratio of concentrate and acid respectively 1:(0.165-0.195) and concentration of sulphuric acid not less than 81 wt %, before sulphatisation mixture of brazilite concentrate and sulpuric acid is pressed into briquettes or subjected to extrusion with further division of extrusion product into briquettes, pressing or extrusion of mixture is carried out at pressure 49·10⁵÷7843·10⁴ N/m², and sulphatisation of briquettes is carried out at temperature 180-200°C.

EFFECT: high degree of purification from uranium and thorium admixtures, increase of productivity and reliability of technical equipment operation.

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