A kind of comprehensive utilization method of phosphoric acid sludge
A technology of sludge and phosphoric acid, applied in the field of secondary resource utilization, can solve the problems of fouling and clogging of the filtration system, low conversion rate of superphosphate, increase in the content of too large particles in the product, etc., and achieves easy operation, simple process flow, and equipment requirements. simple effect
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Embodiment 1
[0017] Example 1: The acid residue mixture containing wet-process phosphoric acid was separated by a plate and frame filter press to obtain a phosphoric acid sludge filter cake. The filtrate was used as wet-process phosphoric acid; for the phosphoric acid sludge filter cake, the stirring speed was 400 rpm, Add it to the reactor where water has been added beforehand at room temperature, keep the solid (filter cake) mass volume ratio to 1:2, add 5.0mol / l hydrochloric acid solution, and react for 2 hours at natural temperature. Control The end point of the reaction is PH≤1.0. After the reaction, the leaching solution is obtained by vacuum filtration and separation; adding titanium tetrachloride solution to the leaching solution at a stirring speed of 200 rpm and room temperature to make the Ti in the system 4+ And PO 4 3- The molar ratio is 3:4, react for 4 hours to promote the formation of titanium phosphate precipitation, and then use vacuum filtration to separate the solid mater...
Embodiment 2
[0019] Example 2: The acid residue mixture containing wet-process phosphoric acid was separated by pressure filtration using a plate and frame filter press to obtain a phosphoric acid sludge filter cake. The filtrate was used as wet-process phosphoric acid; for the phosphoric acid sludge filter cake, the stirring speed was 400 rpm, Add it to the reactor where water has been added beforehand at room temperature, keep the solid (filter cake) mass volume ratio to 1:4, add 4.0mol / l hydrochloric acid solution, and react for 4 hours at natural temperature. Control The end point of the reaction is PH≤1.0. After the reaction, the leaching solution is obtained by vacuum filtration and separation; adding titanium tetrachloride solution to the leaching solution at a stirring speed of 500 rpm and room temperature to make the Ti in the system 4+ And PO 4 3- The molar ratio is 3:4, the reaction is 2 hours to promote the formation of titanium phosphate precipitation, and then the solid materia...
Embodiment 3
[0021] Example 3: The acid residue mixture containing wet-process phosphoric acid was separated by a plate and frame filter press to obtain a phosphoric acid sludge filter cake. The filtrate was used as wet-process phosphoric acid; for the phosphoric acid sludge filter cake, the stirring speed was 400 rpm, At room temperature, add it to the reactor where water has been added in advance, keep the solid (filter cake) mass volume ratio 1:3, then add 5.5 mol / l hydrochloric acid solution, and react at natural temperature for 3 hours. Control The end point of the reaction is PH≤1.0. After the reaction, the leaching solution is obtained by vacuum filtration and separation; the titanium tetrachloride solution is added to the leaching solution at a stirring speed of 300 rpm and room temperature to make the Ti in the system 4+ And PO 4 3- The molar ratio is 3:4, react for 3 hours to promote the formation of titanium phosphate precipitation, and then use vacuum filtration to separate the s...
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