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dihydrate hemihydrate process for the production of phosphoric acid
dihydrate hemihydrate process for the production of phosphoric acid
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机译:二水半水法生产磷酸
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摘要
A method for producing phosphoric acid, comprising attack in an aqueous medium of phosphated rock with sulfuric acid, with formation of a first dihydrate slurry suspended in an aqueous phase having a free P2O5 content between 38 and 50% and a free SO3 content of less than 0.5%, conversion of this first slurry by heating with recrystallization of the solubilized calcium sulfate giving rise to a second hemihydrate slurry, and separation in the second slurry between a production phosphoric acid and a hemihydrate cake, characterized in that it comprises during the attack, addition of a fluorine source in the first slurry in a content from 1% to 5% by weight of F relatively to the P2O5 contained in the phosphated rock.
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机译:一种生产磷酸的方法,该方法包括用硫酸侵蚀磷酸化岩石的水性介质中,形成悬浮在水相中的第一二水合物浆液,其游离P2O5含量在38%至50%之间,而游离SO3含量小于0.5%,通过加热并溶解的硫酸钙重结晶而转化该第一浆液,生成第二半水合物浆液,并在第二浆液中分离生产磷酸和半水合物滤饼,其特征在于,在侵蚀过程中,相对于磷矿石中所含的P 2 O 5,在第一浆料中添加氟源的量为F的1重量%至5重量%。
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