摘要
某硫铁矿尾矿中含有大量的铝、硅、钛等元素,通过化学脱硅法可制备出铝精矿,实现该尾矿的综合利用。结果表明,化学脱硅浸出液加入石灰乳可同时得到再生碱液和硅酸钙产品,NaOH浓度约为120g/L的再生碱液返回脱硅浸出过程循环使用。合成硅酸钙最佳试验条件为:CaO用量为理论用量1.1倍、反应时间120 min、反应温度90℃。在优化条件下SiO_2和Al_2O_3沉淀率分别为95.64%和84.93%。制得的硅酸钙产品白度95%～98%,颗粒直径20μm左右,可用于造纸、建材、保温材料等方面。
Aluminum concentrate can be prepared from pyrite tailings bearing a large amount of aluminum,silicon and titanium by chemical desiliconization.Regenerated alkaline solution and calcium silicate can be simultaneously obtained from desiliconization leachate by adding lime milk.Regenerated alkaline solution with NaOH concentration of 120 g/L is returned to desiliconization leaching process for recycling.The optimum conditions for synthesis of calcium silicate include CaO dosage of 1.1 times of theoretical amount,reaction time of 120 min,and reaction temperature of 90 ℃.Precipitation rate of SiO2 and Al2O3 is95.64% and 84.93% respectively under the optimum conditions.The calcium silicate product with whiteness of 95%~98% and particle diameter of about 20μm can be used in papermaking,as building materials,insulation materials and so on.
作者
李超
刘述平
唐湘平
LI Chao;LIU Shu-ping;TANG Xiang-ping(Institute of Multipurpose Utilization of Mineral Resources,CAGS,Chengdu 610041,China)
出处
《有色金属（冶炼部分）》
CAS
北大核心
2019年第2期25-28,共4页
Nonferrous Metals（Extractive Metallurgy)
基金
中国地质调查局地质调查项目(DD20160074)
关键词
硫铁矿尾矿
脱硅浸出液
硅酸钙
再生碱液
pyrite tailings
desiliconization leachate
calcium silicate
regenerated alkaline solution
