The greater the excess of sulfuric acid, the more complete is the reaction with phosphorus concentrate to produce phosphoric acid?
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In the laboratory, sulfuric acid is used to react with phosphorus concentrate to produce phosphogypsum. I want to know how to obtain phosphogypsum of higher purity – does using more excess sulfuric acid lead to a more complete reaction with the phosphorus concentrate?
No, it’s not. To achieve good filtration performance, or in other words, good crystallization of calcium sulfate, the concentration of sulfate ions in the reaction tank must be kept within a certain range. Both excess and deficiency can affect calcium sulfate crystallization
Thank you. May I ask what range is appropriate for control?
If there is too much sulfuric acid, it will form a coating, which is not good; moreover, the heat of reaction cannot be dissipated