With sulphuric acid leaching solution of low-grade silicon?magnesium nickel laterite ore as raw material, iron was removed by jarosite precipitation, magnesium was removed using sodium fluoride, nickel was precipitated and neutralized from the leaching solution. The effects of different factors on the removal rates of iron and magnesium, and the loss rate and extraction rate of nickel were investigated. The results demonstrated that after oxidative pretreatment of the leaching solution by adding 4 mL/L hydrogen peroxide solution, the removal rate of iron reached 92.1%, the loss rate of nickel was 6.7%, and the main phase in the residue was jarosite [Na2Fe6(SO4)4(OH)12] with Na2SO4 as sodium source for iron removal, solution pH controlled within 1.6?2.2 and reaction time of 1.5 h. After iron removal, magnesium ions in the filtrate were removed using sodium fluoride. Under the best conditions of stirring speed 300 r/min, solution pH 5.5?6.0 and addition of sodium fluoride 25 g/L, the removal rate of magnesium reached 90.9%, and the loss rate of nickel was 6.8%. After the removal of impurities, nickel in the purified solution was extracted by neutralization and hydrolysis with NaOH as precipitating agent. At room temperature, addition of 8 g/L NaOH, extraction rate of neutralized and precipitated nickel was 95.1%. Nickel hydroxide products with purity of 99.5%, with an overall recovery rate of nickel of 82.70%. The removal of impurity elements in the leachate and the extraction of valuable metal nickel are realized, which provides technical support for the efficient utilization of the silico?magnesium type laterite nickel ore.
Chaoqun NIE Xubin WANG Bo LI Yonggang WEI Hua WANG
. Impurity removal from leaching solution of laterite nickel ore and preparation of nickel hydroxide[J]. The Chinese Journal of Process Engineering, 2019
, 19(4)
: 721
-727
.
DOI: 10.12034/j.issn.1009-606X.218309
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