High-quality silica was prepared from copper smelting slag through a method of in situ modification. The effects of the addition of an amount of polyethylene glycol-6000 as a modifier, the modification temperature and the modified endpoint pH on the particle size and specific surface area of the silica were systematically studied. It has been shown that the particle size, specific surface area, and the interstices between the particles were greatly affected by the modification temperature and the pH of the modification endpoint. Optimal conditions are: modifier 10% as solute mass, modification temperature 40°C, and pH of modification endpoint 8.5. Under these conditions, the silicon sinking rate was as high as 97.82%, the prepared silica particles had good dispersibility, the average particle size was 20 nm, the particle morphology was spherical, and the specific surface area was as high as 244.67 m 2 /g, which was superior to A-grade standard of HG/T3061-1999 and ISO 5794-1:2005(E), and could be directly used in the rubber industry.

中文翻译：

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一种用铜冶炼渣制备优质二氧化硅的方法

以铜冶炼渣为原料，通过原位改性的方法制备了优质二氧化硅。系统研究了加入一定量的聚乙二醇6000作为改性剂、改性温度和改性终点pH对二氧化硅粒径和比表面积的影响。研究表明，改性温度和改性终点的 pH 值对粒径、比表面积和颗粒之间的空隙有很大影响。最佳条件是：改性剂质量为 10%，改性温度为 40°C，改性终点的 pH 值为 8.5。在此条件下，硅下沉率高达97.82%，制备的二氧化硅颗粒具有良好的分散性，平均粒径为20 nm，颗粒形貌呈球形，