submicroscopic scale precipitates

However,the industrial production is hardly to attain,for a difficult remove on quantity of ultrafine precipitation and gummy matter during the neutralization.

以冷冻法硝酸磷肥的副产品粗硝钙为原料,中和法除渣,生产硝酸钙或硝酸铵钙是一种新工艺,由于中和时生成的大量微细沉淀物和胶状物质难以除去,规模生产极度困难。

This paper studies the causes of aqueous Fe 2+ content in soil solution being lowered under the condition of reduction and, the formative mechanism and oxidative mechanism of ferrous precipitation.

对土壤溶液在还原条件下水溶性 Fe2 +浓度降低的原因、亚铁沉淀的形成及其氧化机理进行了研究 。