Method for producing broad-concentration phosphoric acid and clean plaster by middle-low grade phosphorus ore wet process
A low-grade, phosphoric acid technology, applied in phosphoric acid, phosphorus oxyacid, calcium/strontium/barium sulfate, etc., can solve the problems of difficult beneficiation, large phosphorus loss, large equipment, etc. rate increase effect
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[0034] Example 1:
[0035] The process flow of this embodiment is as attached figure 2 Shown. P of a phosphate rock 2 O 5 The grade is 16-18%, and the phosphate rock is processed into 80% powder with a 0.125mm (120 mesh) screen. Add 1000 parts of phosphate rock powder to semi-water tank R1 for acid hydrolysis. The operating conditions of acid hydrolysis reaction are: temperature 95~105℃, liquid-solid ratio 4-6, phosphoric acid concentration 37~42%P 2 O 5 , The reaction time is 1 to 3 hours. The acid hydrolyzed slurry after the reaction enters the separator S1 for solid-liquid separation, and the obtained clear liquid enters the crystallization tank R2, and sulfuric acid is added for the crystallization reaction. The crystallization operation conditions are: control SO 3 The concentration is 15-65g / L, the temperature is 100-110°C, and the crystallization reaction is 3-6 hours. After full crystallization reaction, the slurry is separated by vacuum filter S2 to separate semi-aque...
Example Embodiment
[0036] Example 2:
[0037] The process flow of this embodiment is shown in FIG. 3. The grade of a certain phosphate rock is 22~28WT%P 2 O 5 . The particle size of the phosphate rock powder is 80% through a 0.075mm (200 mesh) screen. Add 1000 parts of phosphate rock powder and enter the semi-water tank R1 for acid hydrolysis. Add sulfuric acid during the acid hydrolysis process. The acid hydrolysis reaction operating conditions are: temperature 95~105℃, liquid-solid ratio 5-8, phosphoric acid concentration 40~45WT% P 2 O 5 , Control SO 3 The concentration is 10-20g / L, and the reaction time is 1-2 hours. The acid hydrolyzed slurry after the reaction enters the separator S1 for solid-liquid separation. The obtained clear liquid enters the crystallization tank R2, and sulfuric acid is added to carry out the crystallization reaction. The crystallization reaction operating conditions are: control SO 3 The concentration is 10~45g / L, the temperature is 100~110℃, and the crystallizatio...
Example Embodiment
[0038] Example 3:
[0039] The process flow of this embodiment is as attached figure 2 Shown. P of a phosphate rock 2 O 5 The grade is 16-18%, and the phosphate rock is processed into 80% powder with a 0.125mm (120 mesh) screen. Add 1000 parts of phosphate rock powder to semi-water tank R1 for acidolysis. The operating conditions of acidolysis reaction are: temperature 95~105℃, liquid-solid ratio 4-7, phosphoric acid concentration 37~42%P 2 O 5 , The reaction time is 1 to 3 hours. The acid hydrolyzed slurry after the reaction enters the separator S1 to separate the solid phase. The obtained clear liquid enters the crystallization tank R2, and sulfuric acid is added to carry out the crystallization reaction. The crystallization reaction operating conditions are: control SO 3 The concentration is 15-65g / L, the temperature is 70-85°C, and the crystallization reaction is 2-6 hours. After full crystallization reaction, 628~723 parts of dihydrate white gypsum are separated from the ...
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