Method for preparing sodium fluoride from wet-process phosphoric acid defluorination slag
A wet-process phosphoric acid and sodium fluoride technology, which is applied in the direction of alkali metal fluoride, can solve the problem of difficult separation of sodium fluoride crystals and silicon dioxide, and achieve the effects of low silicon content, reduced production costs, and high product purity
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Embodiment 1
[0034] 1) Prepare wet-process phosphoric acid defluorination slag with mother liquor to make a slurry with a specific gravity of 1.18g / ml; use mother liquor for sodium carbonate to prepare a solution with a specific gravity of 1.25g / ml; wet-process phosphoric acid defluorination slag contains P 2 o 5 : 0.52%, fluorine: 38.12%, SO 4 2- : 3.51%, moisture: 22.12%.
[0035] 2) The defluorinated slag slurry and sodium carbonate solution prepared in step 1) were respectively mixed with 0.70m 3 / h, 0.48m 3 The flow rate of / h is continuously added to the reaction crystallization tank, and the slurry containing fine sodium fluoride crystals obtained by centrifugation in step 4) is fed at a temperature of 1.85 m 3 / h into the reaction crystallization tank, the reaction decomposes and forms a slurry containing coarse particles of sodium fluoride crystals. The temperature in the tank is controlled at 90±5°C, the residence time of the material reaction is 4.5 hours, and the stirring ...
Embodiment 2
[0040] 1) The wet-process phosphoric acid defluorination slag is prepared into a slurry with a specific gravity of 1.23g / ml with the mother liquor; sodium carbonate is prepared with a mother liquor with a specific gravity of 1.27g / ml; the wet-process phosphoric acid defluorination slag contains P 2 o 5 : 0.46%, fluorine: 38.55%, SO 4 2- : 3.11%, moisture: 24.62%.
[0041] 2) The defluorinated slag slurry and sodium carbonate solution prepared in step 1) were respectively mixed with 0.75m 3 / h, 0.51m 3 The flow rate of / h is continuously added to the reaction crystallization tank, and the slurry containing fine sodium fluoride crystals obtained by step 4) is centrifuged at 1.75m 3 / h into the reaction crystallization tank, the reaction decomposes and forms a slurry containing coarse particles of sodium fluoride crystals. The temperature in the tank is controlled at 90±5°C, the residence time of the material reaction is 5.0 hours, and the stirring linear velocity in the tan...
Embodiment 3
[0046] 1) The wet-process phosphoric acid defluorination slag is prepared into a slurry with a specific gravity of 1.25g / ml with the mother liquor; sodium carbonate is prepared with a mother liquor with a specific gravity of a solution with a specific gravity of 1.30g / ml; the wet-process phosphoric acid defluorination slag contains P2O5: 0.55%, Fluorine: 38.42%, SO 4 2- : 3.28%, moisture: 23.75%.
[0047] 2) The defluorinated slag slurry and sodium carbonate solution prepared in step 1) were respectively mixed with 0.85m 3 / h, 0.53m 3 The flow rate of / h is continuously added to the reaction crystallization tank, and simultaneously the slurry containing fine sodium fluoride crystals obtained by screening and centrifugation in step 4) is 1.80m 3 / h into the reaction crystallization tank, the reaction decomposes and forms a slurry containing coarse particles of sodium fluoride crystals. The temperature in the tank is controlled at 90±5°C, the residence time of the material r...
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