从粉煤灰生产Al_2O_3废液中提取高模数硅酸钠的应用研究
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摘要
采用萃取法从粉煤灰生产Al_2O_3废液中提取高模数硅酸钠。由于直接萃取需要消耗大量的萃取剂,且上层中SiO_2的含量高,因此粉煤灰生产Al_2O_3废液不宜进行直接萃取。浓缩预处理之后萃取剂的用量大幅度下降,显著降低运行成本。浓缩处理后,硅酸钠的模数为1.03～1.04,下层硅酸钠中Na_2O的质量分数为12.55%～17.9%,SiO_2的质量分数为13.06%～18.46%。上层中SiO_2的质量分数均在0.5%以下,上层碱度的质量分数为34.9%～45.3%,上层萃取剂的质量分数维持在80%～85%之间。经二级萃取之后,硅酸钠的模数由废液的0.55～0.63提升至2.0～2.3之间,下层硅酸钠中的Na_2O的质量分数为14.8%～17.4%,SiO_2的质量分数为29.5%～36.9%。上层碱度的回收率在42%～50.2%之间。
The extraction of high modulus sodium silicate from Al_2O_3 waste water from fly ash was studied in this paper. As direct extraction required a large amount of extractant, and the content of SiO_2 in the upper layer was high, it is not suitable to extract the waste water directly. After the pretreatment of concentration, the amount of the extractant was greatly reduced, and the operating costs wass remarkably declined.The modulus of sodium silicate was 1.03 ～ 1.04, the content of Na_2O in the lower sodium silicate was 12.55% ～ 17.9%, and the content of SiO_2 was 13.06% ～ 18.46%. The content of SiO_2 in the upper layer was less than 0.5%, the content of the upper alkalinity achieved 34.9% ～ 45.3%, and that of the upper extractant was between 80% ～85%. After the secondary extraction, the modulus of sodium silicate was increased from 0.55 ～ 0.63 to 2.0 ～ 2.3, the content of Na_2O in the lower sodium silicate was 14.8% ～ 17.4%, and the content of SiO_2 attained 29.5% ～ 36.9%. The recoveries of the upper alkalinity were 42% ～ 50.2%.
The extraction of high modulus sodium silicate from Al_2O_3 waste water from fly ash was studied in this paper. As direct extraction required a large amount of extractant, and the content of SiO_2 in the upper layer was high, it is not suitable to extract the waste water directly. After the pretreatment of concentration, the amount of the extractant was greatly reduced, and the operating costs wass remarkably declined.The modulus of sodium silicate was 1.03 ～ 1.04, the content of Na_2O in the lower sodium silicate was 12.55% ～ 17.9%, and the content of SiO_2 was 13.06% ～ 18.46%. The content of SiO_2 in the upper layer was less than 0.5%, the content of the upper alkalinity achieved 34.9% ～ 45.3%, and that of the upper extractant was between 80% ～85%. After the secondary extraction, the modulus of sodium silicate was increased from 0.55 ～ 0.63 to 2.0 ～ 2.3, the content of Na_2O in the lower sodium silicate was 14.8% ～ 17.4%, and the content of SiO_2 attained 29.5% ～ 36.9%. The recoveries of the upper alkalinity were 42% ～ 50.2%.
引文
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[2]袁美蓉,卢锦堂,孔纲.硅酸钠模数对热镀锌件转化膜耐蚀性的影响[J].材料保护, 2009, 42(10):13-16.
[3]赵晶晶,赵欢,唐诗慧.工业废弃二氧化硅制水玻璃的正交试验研究[J].辽宁工业大学学报(自然科学版), 2014, 34(4):261-264.
[4]刘建恩.一种从粉煤灰中提取硅酸钠的方法:中国, 201410728467.8[P].2014-12-03.
[5]张战军,陈刚,徐鹏,等.利用粉煤灰生产九水偏硅酸钠的方法:中国, 201110120102.3[P].2011-05-11.
[6]秦晋国.利用低浓度硅酸钠溶液生产偏硅酸钠的方法:中国, 201210513448.4[P].2012-12-05.
[7]顾松青,陈念贻,刘祥民,等.一种提高拜耳法生产氧化铝循环效率的方法:中国, 200610000862.x[P].2006-01-16.
[8]乔梁,王鑫,郑精武,等.添加乙醇对水玻璃溶液的影响机制[J].无机盐工业, 2011, 43(7):25-28.
[9]张福顺.硅酸钠的溶解和过滤[C]//中国无机盐工业协会无机硅化物分会2006年度年会暨全国无机硅化物行业技术与信息交流大会.北京:中国无机盐工业协会,2006.