CAJ | 학술논문

以元江红土镍矿硫酸溶出液沉镍废水为原料，加入碱式碳酸镁，在室温下利用不同离子水解 pH 值差异，实现富镁除杂的目的。实验研究了 pH 值、反应时间、静置时间对废水中离子浓度的影响，确定了较优操作条件为：pH 值6.5、搅拌通气时间5 h、静置时间3 h。在此条件下，废水中镁离子的含量提高7.6%，铁、铝、钙、镍杂质离子的去除率分别为99.85%、99.9%、28.57%、35.8%。将此沉镍废水净化液真空浓缩、结晶，分离干燥得七水硫酸镁产品，其质量达到 HG/T 2680—95工业七水硫酸镁合格品的要求。
이원강홍토얼광류산용출액침얼폐수위원료，가입감식탄산미，재실온하이용불동리자수해 pH 치차이，실현부미제잡적목적。실험연구료 pH 치、반응시간、정치시간대폐수중리자농도적영향，학정료교우조작조건위：pH 치6.5、교반통기시간5 h、정치시간3 h。재차조건하，폐수중미리자적함량제고7.6%，철、려、개、얼잡질리자적거제솔분별위99.85%、99.9%、28.57%、35.8%。장차침얼폐수정화액진공농축、결정，분리간조득칠수류산미산품，기질량체도 HG/T 2680—95공업칠수류산미합격품적요구。
Increase of magesium ion and removal of impurity ions were achieved through adding basic magnesium carbonate to the laterite nickel acid leaching wastewater and using the difference between hydrolysis pH values of metal ions at ambient temperature. The influence of pH value,reaction time and standing time on the concentration of ions was investigated. The optimal conditions were as follows:pH value 6.5,reaction time 5h,standing time 3h. Under those conditions,the content of magnesium ion increased by 7.6% and the removal rates of iron ion,aluminum ion,calcium ion and nickel ion were 99.85%,99.9%,28.57%,and 35.8%,respectively. Magnesium sulfate heptahydrate was obtained by vacuum concentration,crystallization,separation and drying of purified treated wastewater,the purity of the product was more than 98%,which satisfied the requirement of HG/T 2680—95.