基于脲酶诱导碳酸钙沉淀的新型扬尘抑制剂

为研制出一种持续时间长、减少二次扬尘、耐高温、绿色环保的扬尘抑制剂，利用脲酶诱导碳酸钙沉淀的方法，确定了脲酶抑尘剂的最佳成分配比为脲酶30 g·L-1、尿素0.8 mol·L-1、氯化钙0.8 mol·L-1、高分子吸水树脂1 g·L-1。此外还选取了纯水、氯化钙和高分子吸水树脂这3种抑尘剂与脲酶抑尘剂进行性能对比。结果表明：脲酶抑尘剂的蒸发率为0.04 g·（m2·s）-1、失水率23.7%、抗风指数27.8、抑尘效率70.7%。其抗蒸发性、保水性、抗风性能和抑尘效率都要优于其他3种抑尘剂。

New dust-depressor using urease induced calcite precipitation

To develop a new type of dust-depressor which has the characteristics of longer residual action, secondary dust reduction, high temperature resistance and environmental protection. Best proportions (30 g·L-1 of urease, 0.8 mol·L-1 of urea, 0.8 mol·L-1 of calcium chloride and 1 g·L-1 super absorbent polymer) of urease dust-depressor have been determined by utilizing a method of urease inducing calcite precipitation. In addition, pure water, CaCl2 and super absorbent polymer are chosen to compare with urease dust-depressor on the performance. The results showed that the urease dust-depressor possesses 0.04 g·(m2·s)-1 of evaporation rate, 23.7% of driage, 27.8 of wind resistance index, 70.7% of dust suppression efficiency, which are superior to the other 3 dust-depressors on the performance of evaporation and wind resistance, water retentivity, and dust suppression efficiency.