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method for processing a rohphosphats containing magnesium to phosphoric acid and a magnesium - calcium carbonate mixture
method for processing a rohphosphats containing magnesium to phosphoric acid and a magnesium - calcium carbonate mixture
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机译:镁到磷酸和镁-碳酸钙混合物的六磷酸盐的处理方法。
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摘要
Magnesium-bearing phosphate rock in small grain size is converted into phosphoric acid so that no by-products, which are difficult to dispose of are produced. The crushed rock is mixed with water and subsequently acidified with nitric acid, the reaction product being filtered and washed before the neutralization point is reached. The wet and filtered rock is treated with nitric acid to form phosphoric acid and a slurry of calcium nitrate tetrahydrate. The previously formed filtrate is mixed with the calcium nitrate tetrahydrate slurry and this mixture is reacted with ammonia and carbonic acid to form ammonium nitrate, magnesium carbonate and calcium carbonate, which are then separated into an ammonium nitrate solution and a mixture of magnesium and calcium carbonates.
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