硝酸浸出液中的铝高效脱除

High-efficiency Removal of Aluminum from Nitric Acid Leaching Liquor

以红土镍矿硝酸浸出液为对象,系统研究了硝酸浸出液中沉淀除铝环节,并提出一种高效沉淀除铝的新方法。详细考察了温度、p H值和时间对沉淀除铝的影响,得到最佳工艺条件为温度40℃、p H值4.0~4.2、时间30 min。和常规沉淀法对比,最佳工艺条件下得到的铝渣镍、钴夹带率均小于1%,比常规沉淀法低3%以上;得到的沉淀矿浆固液分离容易,在负压0.04 MPa时,抽滤速度为0.22 m^3/(h·m^2),是常规沉淀法的12~13倍,成功解决了湿法冶金中铝沉淀后难过滤及有价金属夹带多的难题,具有广阔的应用前景。

The removal of aluminum from nitric acid leaching liquor of laterite nickel ore was investigated. The aluminum removal process in the nitric acid leaching solution was systematically studied,and a high-efficiency precipitation method of aluminum removal was proposed The effect of temperature,p H value and time on the removal of aluminum from precipitation were examined in detail.The optimum processing conditions were temperature 40 ℃,pH 4. 0—4. 2 and time 30 min. Compared with the conventional precipitation method,the entrainment rate of nickel and cobalt are both less than1% in aluminum slag obtained under the optimum process conditions,which is 3% lower than the conventional precipitation method. The obtained precipitate slurry is easy to be separated by solid and liquid,and when the negative pressure is-0. 04 MPa,the suction filtration rate is 0. 22 m^3/（ h·m^2）,which is 12 to 13 times that of the conventional precipitation method. This high-efficiency precipitation method solves the difficult problem of difficult filtration and entrapment of valuable metals after precipitation of aluminum in hydrometallurgy,and has broad application prospects.