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Process for the manufacture of finely dispersed sparingly soluble salts of oxyacids of phosphorus

机译:磷的含氧酸的细分散微溶盐的制备方法

摘要

The invention relates to a process for making a finely dispersed, sparingly soluble salt of an oxyacid of phosphorus, having a maximum particle size of 20 m, by reacting a compound of a divalent metal with the oxyacid of phosphorus or an alkali metal or ammonium salt thereof. More particularly, finely dispersed salt consisting to an extent of at least 90% of particles with a size between 0.05 and 7 m is made. To this end, an at least 5% by weight aqueous solution or suspension of a compound of a divalent metal selected from the group Mg, Ca, Sr, Ba, Mn, Zn, Cu, Cd, Pb, Sn, Co and Ni is reacted, while maintaining a pH range of between 3 and 9 and while stirring, with an at least 2 mol % solution of at least one trivalent metal selected from the group Al, Fe and Cr in the oxyacid of phosphorus and, optionally, with an aqueous solution of an alkali metal or ammonium salt of the oxyacid of phosphorus, and the precipitated salt is separated off and dried.
机译:本发明涉及一种通过使二价金属的化合物与磷的含氧酸或碱金属或铵盐反应而制备最大粒度为20m的微细分散的,含磷的含氧酸的盐的方法。其。更特别地,制得的微细盐至少占颗粒大小的90%,粒度在0.05至7m之间。为此,选自Mg,Ca,Sr,Ba,Mn,Zn,Cu,Cd,Pb,Sn,Co和Ni的至少5重量%的二价金属的化合物的水溶液或悬浮液为:在保持3至9的pH范围并搅拌的同时,与至少2 mol%的至少一种选自Al,Fe和Cr的三价金属在磷的含氧酸中的溶液反应,并任选地与磷的含氧酸的碱金属盐或铵盐的水溶液,分离出沉淀的盐并干燥。

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