A method and device for producing ammonium tungstate from tungsten-containing waste
A technology of ammonium tungstate and tungsten waste, applied in the direction of improving process efficiency, etc., can solve problems such as low tungsten recovery rate and equipment corrosion, achieve high tungsten recovery rate and improve production efficiency
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Embodiment 1
[0044] S1, get tungsten-containing waste (in WO 3 The mass content of tungsten is 40%, with Co 3 o 4 The mass content of cobalt calculated is 20%) 200g, add calcium carbonate, Ca / WO 3 The mol ratio is controlled at 4.5:1, mixes evenly, obtains compound;
[0045] S2. Calcining the mixed material at a temperature of 800° C. for 4 hours to obtain a roasted material;
[0046] S3, add ammonium carbonate in the roasting material, then the gained mixture is placed in airtight container and react, the addition of ammonium carbonate is to make the calcium in the roasting material be converted into 1.2 times of the amount (theoretical amount) of calcium carbonate, reaction temperature The temperature is 60°C, the reaction time is 4h, and the solid-liquid ratio is 1:6. After that, the obtained solid-liquid mixture is filtered, and the filter residue is washed three times with heated anhydrous salt water (50°C, the same below), and the filtrate is combined with the washed water phase t...
Embodiment 2
[0048] S1, get tungsten-containing waste (in WO 3 The mass content of tungsten is 95%, with Co 3 o 4 The mass content of cobalt is 0.1%) 150g, add calcium hydroxide, Ca / WO 3 The mol ratio is controlled at 4.8:1, mixes homogeneously, obtains compound;
[0049] S2. Calcining the mixed material at a temperature of 750° C. for 3 hours to obtain a roasted material;
[0050] S3, adding ammonium bicarbonate to the roasting material, then the resulting mixture is placed in a closed container for reaction, the amount of ammonium bicarbonate added is 1.4 times the amount (theoretical amount) that makes the calcium in the roasting material convert into calcium carbonate, The reaction temperature is 75°C, the reaction time is 3 hours, and the solid-to-liquid ratio is 1:5. Afterwards, the obtained solid-liquid mixture is filtered, and the filter residue is washed three times with heated anhydrous salt water. The combined and washed water phase of the filtrate is ammonium tungstate solut...
Embodiment 3
[0052] S1, get tungsten-containing waste (in WO 3 The mass content of tungsten is 65%, with Co 3 o 4 The mass content of cobalt is 10%) 100g, add calcium oxide, Ca / WO 3 The mol ratio of the mixture is controlled at 6:1, and the mixture is homogeneously obtained to obtain a mixture;
[0053] S2. Calcining the mixed material at a temperature of 780° C. for 4 hours to obtain a roasted material;
[0054] S3, add ammonium phosphate in roasting material, then place gained mixture in airtight container and react, the addition of ammonium phosphate is to make the calcium in roasting material be converted into 1.5 times of the amount (theoretical amount) of calcium phosphate, reaction temperature The temperature is 55°C, the reaction time is 5h, and the solid-liquid ratio is 1:8. After that, the obtained solid-liquid mixture is filtered, and the filter residue is washed three times with heated anhydrous salt water. was 97.5%.
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