硼改性微粒硅溶胶的研制及应用

Preparation of the Boron Modified Silica Sol

用硼化物对硅溶胶进行表面改性，最佳的改性方案是将硼化物与硅酸钠混合形成尾料。再将未碱化、末熟化的酸性硅溶胶滴加入尾料中。n（B）：n（Si）=0．08-0．1，硼改性微粒硅溶胶体积分数约为5％。其助留助滤性能优良，与空白样相比可使浆料留着率提高2～3倍，留着率比进口的NP882提高约30％。硼改性制备的硅溶胶霞现性好，性能稳定。

In order to prepare a stable silica sol with high concentration, acidic silica sol was directly modified with the mixture of bonide （B） and Na2SiO3. The optimum modification degree of the ratio boron to silica （B/Si） was between 0.08 and 0, 1 .The boron modified silica sol with about 5% concentration was obtained. The boron modified silica sol had excellent retention and drainage effect. The fines retention efficiency increased two or three times with using boron modified silica sol; its retention efficiency was 30% higher than that of the imported product NP 882. The effect of boron modified silica sol had good reproducibility. Also its stable time was more than one year.