粗制氢氧化钴产品提钴降镁工业试验及优化  

Industrial Test and Optimization of Improving Cobalt Content and Reducing Magnesium Content of Crude Cobalt Hydroxide Products

作　　者：谢添 邱冠周 童雄[1] 王国彬[1] 马鑫铭 XIE Tian;QIU Guan-zhou;TONG Xiong;WANG Guo-bin;MA Xin-ming(Kunming University of Science and Technology,Kunming 650093,China;China Railway Resources Group Co.,Ltd.,Beijing 100039,China;Central South University,Changsha 410083,China;BGRIMM Technology Group,Beijing 100160,China)

机构地区：[1]昆明理工大学,昆明650093 [2]中铁资源集团,北京100039 [3]中南大学,长沙410083 [4]矿冶科技集团有限公司,北京100160

出　　处：《有色金属（冶炼部分）》2022年第1期97-102,共6页Nonferrous Metals（Extractive Metallurgy)

基　　金：中国大洋协会项目(JS-KTHT-2019-01)。

摘　　要：为获得符合行业标准的粗制氢氧化钴产品,并降低产品中杂质镁的含量,增加企业利润,以沉钴前液为研究对象,采用两段沉钴工艺制取粗氢氧化钴。在反应温度45℃、搅拌速度900 r/min、氧化镁浆液浓度10%、反应时间4 h、反应终点pH=7.4~7.5的条件下进行一段沉钴,并在搅拌转速170 r/min、液固比4∶1的条件下对一段沉钴滤饼洗涤20 min,可获得含钴35%,含镁低于6%的粗制氢氧化钴产品,达到二级工业品要求,该试验数据能够很好地指导工业生产。在二段沉钴前液含钴0.27 g/L,温度30℃,采用15%的石灰浆进行二段沉钴,反应时间约2 h,反应终点pH=7.9~8.2时,最终溶液中的钴离子浓度可降至0.05 g/L以下;当终点pH为9.5~12时,溶液中镁的离子浓度可低于1 g/L,达到直接外排的环保要求。In order to obtain crude cobalt hydroxide products in line with industry standards,reduce content of impurity magnesium in products and increase enterprise profits,crude cobalt hydroxide was prepared by two-stage cobalt precipitation process applying pre cobalt precipitation solution as raw materials.When first stage cobalt precipitation is conducted under the conditions including reaction temperature of 45℃,stirring speed of 900 r/min,magnesium oxide slurry concentration of 10%,reaction time of 4 h,and pH value of reaction end point of 7.4—7.5,and then cobalt precipitation is washed for 20 min under the conditions of stirring speed of 170 r/min and L/S of 4∶1,the laboratory index of crude cobalt hydroxide product containing 35% cobalt and magnesium content of 6% below is obtained,which meets the requirements of secondary level industrial products.Cobalt concentration in final solution can be reduced to 0.05 g/L below under the conditions of cobalt content in second-stage cobalt pre solution of 0.27 g/L,temperature of 30℃,precipitation with 15% lime slurry,reaction time of about 2 h,and pH value of reaction end point of 7.9-8.2.When terminal pH value is 9.5-12,magnesium concentration in solution is lower than 1 g/L,which meets the environmental protection requirements of direct discharge.

关 键 词：粗制氢氧化钴 二段沉钴 氧化镁 降镁 

分 类 号：TF803.25[冶金工程—有色金属冶金]