Process for recycling ammonium tungstate from ammonium paratungstate crystallization mother liquor
A crystallization mother liquor, ammonium paratungstate technology, applied in the direction of improvement of process efficiency, tungsten compounds, inorganic chemistry, etc., can solve the problems of high energy consumption, high consumption of auxiliary materials, high production cost, etc., to save energy costs, short process flow, and production The effect of cost reduction
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Embodiment 1
[0045] Example 1 This example is a process for recovering ammonium tungstate from ammonium paratungstate crystallization mother liquor
[0046] Including the following steps:
[0047] Step (1): Formation of ammonium tungstophosphate precipitation
[0048] Crystallization mother liquor 500l (WO 3 : 30g / l), add 1.7kg of phosphoric acid (85% phosphoric acid) with a theoretical amount of 300%, stir evenly and let it stand for 30 minutes, add 60l hydrochloric acid under stirring conditions to make the pH value = 0.5, and obtain ammonium tungstophosphate precipitation. Leave for 12 hours;
[0049] Step (2): Ammonium Tungstophosphate Precipitation Ammonia Dissolution
[0050] Add 37l of ammonia water with a mass concentration of 10% into the dissolution tank, heat the temperature to 45°C, add the ammonium dodecatungtophosphate precipitate obtained in step (1) under stirring conditions (make a slurry with 13 l of water to facilitate addition), and control the reaction The temperat...
Embodiment 2
[0053] Example 2 This example is a process for recovering ammonium tungstate from ammonium paratungstate crystallization mother liquor
[0054] Including the following steps:
[0055] Step (1): Formation of ammonium tungstophosphate precipitation
[0056] Crystallization mother liquor 500l (WO 3 :30g / l), add 1.7kg of phosphoric acid (85 phosphoric acid) with a theoretical amount of 300%, stir evenly and let it stand for 30 minutes, add 80l of hydrochloric acid under stirring conditions to make the pH value = 0.3, and obtain ammonium tungstophosphate precipitation. Leave it for 16 hours;
[0057] Step (2): Ammonium Tungstophosphate Precipitation Ammonia Dissolution
[0058] Add 37L of ammonia water with a mass concentration of 10% into the dissolution tank, heat the temperature to 55°C, add the dodeca-tungsten ammonium phosphate precipitation obtained in step (1) under stirring conditions (add 7 l of water to make a slurry, which is convenient to add), and control the reacti...
Embodiment 3
[0061] Example 3 This example is a process for recovering ammonium tungstate from ammonium paratungstate crystallization mother liquor
[0062] Including the following steps:
[0063] Step (1): Formation of ammonium tungstophosphate precipitation
[0064] Crystallization mother liquor 500l (WO 3 :30g / l), add 1.7kg of phosphoric acid (85 phosphoric acid) with a theoretical amount of 300%, stir evenly and let it stand for 30 minutes, add 60l of hydrochloric acid under stirring conditions to make the pH value = 0.5, and obtain ammonium tungstophosphate precipitation. Leave it for 16 hours;
[0065] Step (2): Ammonium Tungstophosphate Precipitation Ammonia Dissolution
[0066] Add 37 l of ammonia water with a mass concentration of 10% into the dissolution tank, heat the temperature to 50°C, and add the ammonium dodecatungtophosphate precipitate obtained in step (1) under stirring conditions (add 10 l of water to make a slurry), and control the reaction temperature at 65 ℃, the...
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