某硫铁矿尾矿脱硅浸出液再生及硅酸钙的合成
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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 Al_2O_3 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.
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 Al_2O_3 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.
引文
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[2]何兵兵,刘代俊,王章露,等.硫铁矿尾矿的综合利用工艺研究[J].硫磷设计与粉体工程,2012(6):19-22.
[3]肖钊铝,司志勇.我国氧化铝生产中新工艺、新技术的应用研究[J].矿产保护与利用,2008(4):51-55.
[4]李博,熊述清,刘述平,等.重庆某低品位铝土矿化学脱硅产物溶出氧化铝实验研究[J].湿法冶金,2013,32(6):379-381.
[5]邱廷省,吴紧钢,吴承优.铝土矿脱硅技术及其发展现状[J].矿山机械,2015,43(4):8-13.
[6]马智敏,陈兴华,王玉才,等.铝土矿选矿脱硅技术研究现状及前景展望[J].矿产综合利用,2015(1):1-6.
[7]潘群雄.水热合成硅酸钙外加剂作用机理探讨[J].建筑节能,2001,29(6):28-30.
[8]孙德文,宋宝祥,王成海.合成硅酸钙特性及其在造纸废水处理中的应用[J].纸和造纸,2011,30(6):52-54.
[9]李懋强.水热合成硅酸钙微孔球形颗粒[J].硅酸盐学报,2002,30(增刊1):64-67.