以硫酸常压浸出液为原料,以腐殖土为中和剂,采用高温水解法对其进行净化除杂研究.在探讨除杂原理的基础上,考察水解温度、时间、腐殖土加入量和加入方式对杂质脱除率的影响.研究结果表明:水解反应前每升溶液加入腐殖土100 g,在220℃下反应1h,常压浸出液中的铁、铬、铝的脱除率分别达到96.19％,93.32％和93.99％,同时镍、钴、镁、锰的回收率均在99％以上;水解渣成分以Fe2O3为主,具有良好的过滤性能;高压釜结垢中含有Fe2O3,NaAl3(SO4)2(OH)6和FeOHSO4,结垢方式为沉积式结垢,易清理.%The hydrolysis process at high temperature was adopted to remove the impurities in atmosphere leaching liquor when the saprolite was used as a neutralizer. Based on the hydrolysis principles, the effects of hydrolysis temperature and time, the adding amount and methods of the saprolite on the removal of impurities were investigated. The results show that 96.19% iron, 93.32% chromium and 93.99% aluminum in liquor are removed when the saprolite of 100 g/L solution is added before hydrolysis process at 220 "C for 1 h and more than 99% of nickel, cobalt, magnesium and manganese are recovered. The residue with fine filtration performance consists chiefly of Fe2O3. The scale formed as a deposition in hydrolysis process consists of Fe2O3, NaAl3(SO4)2(OH)6 and FeOHS04 and they are easily removed.
展开▼
