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发明公开
CN109095572A 聚硅酸硫酸铝铁絮凝剂、制备方法及应用 无效 - 驳回

聚硅酸硫酸铝铁絮凝剂、制备方法及应用
摘要：
本发明公开了一种聚硅酸硫酸铝铁絮凝剂、制备方法及应用，属于油气田废水净化技术领域。聚硅酸硫酸铝铁絮凝剂由以下步骤制备得到：1)将硅酸钠溶于水中得到浓度0.2～0.5mol/L的溶液，调节溶液pH值为2.1～5，室温下搅拌聚合10～30min，得到聚硅酸；2)按照摩尔比加入硫酸铝和硫酸亚铁，(Al+Fe)/Si＝0.5～2.2，Al/Fe＝0.5～2.2，室温下搅拌聚合10～30min，静置熟化20～28h，即得。该絮凝剂专用于油气田钻井废液处理，絮凝沉淀效果好，单剂投加且投加用量小，COD去除率高，处理后废水COD指标低于国家排放标准。
摘要（英）：

The invention discloses a polysilicic acid aluminum sulfate flocculating agent, a preparation method and application, and belongs to the technical field of purification of waste water in an oil and gas field. The preparation method for the polysilicic acid aluminum sulfate flocculating agent comprises the steps that 1) sodium silicate is dissolved in water to obtain a solution with the concentration of 0.2-0.5 mol/L, the p H value of the solution is 2.1-5, and the solution is stirred for polymerization for 10-30 minutes at the indoor temperature to obtain polysilicic acid; 2) according to molar ratio, aluminum sulfate and ferrous sulfate are added, (Al+Fe)/Sl=0.5-2.2, Al/Fe=0.5-2.2, the mixture is stirred for polymerization for 10-30 minutes at the indoor temperature and subjected to standing for curing for 20-28 hours, and the polysilicic acid aluminum sulfate flocculating agent is obtained. The flocculating agent is specially applied to waste liquid treatment for drilling wells in the oil and gas field, the flocculent precipitate effect is good, single dosage is added, the addition amount is small, the COD removing rate is high, and after treatment, the COD index of waste water is below the national emission standard.

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