Smelting and separation method of rare earth ore
A separation method and technology of rare earth ore, applied in the field of smelting and separation of rare earth ore, can solve the problems of high investment cost, limited application, high operating cost, etc., and achieve the effect of improving recovery, reducing production cost and improving recovery rate
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Embodiment 1
[0064] After roasting 1Kg of Baotou mixed type rare earth concentrate (REO 50.4%) with sulfuric acid, it was leached and neutralized with an aqueous solution of magnesium bicarbonate (calculated as MgO) with a concentration of 2g / L, and the pH value of the control end point was 4.5. Impurities such as iron, phosphorus, and thorium were precipitated and removed, and solid-liquid separation obtained 48.9L of rare earth sulfate solution containing magnesium and leaching residue; the content of rare earth in the rare earth sulfate solution containing magnesium was 10.0g / L (calculated as REO), and the recovery rate of rare earth was 97.0%.
Embodiment 2
[0066] After roasting 1Kg of Baotou mixed type rare earth concentrate (REO 53.0%) with sulfuric acid, it was leached with a magnesium bicarbonate aqueous solution (calculated as MgO) with a concentration of 18g / L and neutralized to remove impurities. The pH at the end point was controlled to be 4.3. Impurities such as iron, phosphorus, and thorium were precipitated and removed, and solid-liquid separation obtained 12.64L of magnesium-containing rare earth sulfate solution and leaching residue; the rare earth content in the magnesium-containing rare earth sulfate solution was 41.0g / L (calculated by REO), and the rare earth recovery rate was 97.5%.
Embodiment 3
[0068] Baotou mixed rare earth concentrate (REO 51.6%) is mixed with 93wt% concentrated sulfuric acid at a rate of 1t / h and fed into the rotary kiln. Use magnesium bicarbonate aqueous solution with a concentration of 10g / L to leach and neutralize and remove impurities from the rare earth roasted ore acidified and roasted by sulfuric acid. 3 / h and leaching slag; the rare earth content in magnesium-containing rare earth sulfate solution is 34.5g / L (calculated by REO), the recovery rate of rare earth is 97.6%, impurity ions such as iron, phosphorus, thorium form precipitation and enter leaching slag.
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