| 摘要 |
<p>PURPOSE:To remove gangue components as far as possible and to obtain treated matter having a high Ni grade in pretreatment of magnesium silicate nickel ore. CONSTITUTION:The magnesium silicate nickel ore is subjected to a leaching treatment and is separated to the leaching residues essentially consisting of SiO2 and the leaching liquid contg. Ni, Fe and Mg. This leaching liquid is dried to obtain the dried matter essentially consisting of a chloride. In addition, unreacted hydrochloric acid is recovered. This dried matter is roasted by using a rotary kiln under the conditions of 0.02 to 0.5m/s gas flow velocity in the rotary kiln, 30 to 120 minutes stagnation time of the roasted matter and >=150 <=550 deg.C roasting temp., by which the total amt. of the Ni and Fe and a part of the Mg are made into water-insoluble matter and the gaseous hydrochloric acid is recovered. Further, the roasted product is washed with water and is separated to the water insoluble matter consisting of the total amt. of the Ni and the Fe and a part of the Mg and an aq. MgCl2 soln.</p> |
