Phosphorus-gypsum is a by-product of phosphoric acid and some Compound Washing product industry . Powdered coal ash is a kind of powder which collected from waste gases of coal ash boiler .
磷石膏是磷酸工业和某些合成洗涤产品工业的副产品，粉煤灰是在煤灰锅炉废气中收集下来的粉末。
2
Objective To analyze the effect of non phosphorus soap powder on workers' health.
目的研究无磷洗衣粉粉尘对工人健康的影响。
3
The effects of activated phosphorite powder on the phosphorus utilization of maize were studied by nutrient quartz_sand culture experiment in the green_house.