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Process for stabilisation of impure phosphoric acid by the wet process against the formation of mud and the process for preparation of phosphoric acid of commercial type with stability aperfeicoada
Process for stabilisation of impure phosphoric acid by the wet process against the formation of mud and the process for preparation of phosphoric acid of commercial type with stability aperfeicoada
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机译：通过湿法稳定不纯磷酸的方法，以防止形成泥浆，以及制备具有稳定性无假丝藻的商业型磷酸的方法
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1481976 Stabilizing phosphoric acid FERTILIZANTES FOSFATADOS MEXICANOS SA 8 Aug 1974 [13 Dec 1973] 34993/74 Heading C1A Impure wet-process phosphoric acid containing 28 to 32 wt. per cent of P 2 O 5 and, as impurities, compounds of Fe, Al, Si, F, Na and K is stabilized against sludge formation by: (i) adding to the acid 0-1 to 1 wt. per cent of an inorganic oxidizing agent and 0À1 to 1 wt. per cent of reactive silica; (ii) concentrating the acid to a P 2 O 5 content of 35 to 42 wt. per cent, steps (i) and (ii) being carried out in either order; (iii) ageing the concentrated solution for a time sufficient for the formation of a solid phase and a relatively stable liquid phase of phosphoric acid; (iv) separating the liquid and solid phases; (v) further concentrating the liquid phase to a P 2 O 5 content of at least 50 wt. per cent, and then subjecting the acid to a further separation from precipitated solids to provide a clarified acid having less than 1 wt. per cent solids immediately after clarification. The oxidizing agent is preferably nitric acid, but may be sodium chromate, potassium dichromate or potassium permanganate. "Reactive silica" is one which reacts with F compounds in the acid to give fluorosilicic acid, and may be diatomaceous earth or an activated silica.
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机译：1481976稳定磷酸肥料FOSFATADOS MEXICANOS SA 1974年8月8日[1973年12月13日] 34993/74标题C1A含28至32 wt。％的不纯的湿法磷酸。通过以下方式稳定P2 O 5的百分含量，以及作为杂质的Fe，Al，Si，F，Na和K的化合物，以防止形成污泥：（i）将0-1至1 wt。百分比的无机氧化剂和0-1到1 wt。反应性二氧化硅的百分比; （ii）将酸浓缩至P 2 O 5含量为35至42重量％。 ％，以任何顺序执行步骤（i）和（ii）; （iii）将浓缩溶液陈化足以形成磷酸的固相和相对稳定的液相的时间; （iv）分离液相和固相; （v）进一步将液相浓缩至至少50wt。％的P 2 O 5含量。 ％，然后使酸与沉淀的固体进一步分离，以提供小于1wt。％的澄清酸。澄清后立即清除固体百分比。氧化剂优选为硝酸，但可以为铬酸钠，重铬酸钾或高锰酸钾。 “反应性二氧化硅”是与酸中的F化合物反应生成氟硅酸的物质，可以是硅藻土或活化的二氧化硅。
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