The scaling on equipment and pipeline of WPA filtration unit is caused by the precipitation of potassium and sodium fluosilicate when the temperature of acid decreases.
分析湿法磷酸过滤设备与管道结垢的主要原因是氟硅酸钾、钠盐因磷酸液相温度下降而沉积下来。
Through a year operation, it is stated that the Operational performances of this unit is stable and reliable and the ratio of dust precipitation is increased from 90% to 98%.
运行结果表明，该设备工作性能稳定可靠，除尘效率有了明显的提高，由原来的90％提高到98％。
In this 50 years, grain crops output, the grain crops sown area and the yield per unit of area and the temperature are obviously related, but they are slightly correlative with the precipitation.
近50年的粮食作物产量、粮食作物播种面积和单位面积产量与气温均呈明显的正相关，而与降水的相关性很差。
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