Method for utilizing high-magnesium phosphate tailings to produce magnesium fluoride and by-product calcium carbonate
A technology of high-magnesium phosphorus tailings and magnesium fluoride, applied in the direction of magnesium fluoride, calcium carbonate/strontium/barium, magnesium halide, etc., can solve the problems of polluting the surrounding environment, waste of magnesium resources, and few utilization channels, and achieve technological Simple, low production cost, good economic benefits
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Embodiment 1
[0025] Chemical composition of high magnesium phosphorus tailings: P 2 o 5 7.04%, MgO16.86%, CaO37.48%
[0026] Weigh 100 g of magnesium and phosphorus tailings and calcinate at 980° C. to obtain 61.4 g of calcined white. Calcined white and 700g of water were stirred at 80°C for 40 minutes to obtain a digestive juice. Supplement 800g of water into the digestive juice, and then pass gas with a volume fraction of 35% carbon dioxide into the digestive juice to carry out carbonization reaction at 20°C to obtain carbonized liquid, stop the reaction when the pH value of the carbonized liquid drops to 6.7, and separate the carbonized liquid The phosphate rock at the bottom is precipitated and filtered, the filtrate is heavy magnesium water, and the filter cake is dried to obtain the calcium carbonate product; add hydrofluoric acid to the obtained heavy magnesium water, mix and stir the reaction at a temperature of 50°C, and the reaction time is 50 minutes. Mg in the reaction solut...
Embodiment 2
[0028] Chemical composition of high magnesium phosphorus tailings: P 2 o 5 6.00%, MgO18.25%, CaO36.82%
[0029] Weigh 100 g of magnesium and phosphorus tailings and calcinate at 950° C. to obtain 59.8 g of calcined white, and stir the calcined white and 500 g of water at 80° C. for 30 minutes to obtain digestive juice. Add 600g of water to the digestive juice, and then pass gas with 30% carbon dioxide volume fraction into the digestive juice to carry out carbonization reaction at 25°C to obtain carbonized liquid, stop the reaction when the pH value of the carbonized liquid drops to 6.9, and separate the carbonized liquid The phosphate rock at the bottom is precipitated and filtered, the filtrate is heavy magnesium water, and the filter cake is dried to obtain calcium carbonate product; add hydrofluoric acid to the obtained heavy magnesium water, mix and stir at a temperature of 10°C for a reaction time of 120 minutes, mix Mg in the reaction solution after 2+ , F - The stoi...
Embodiment 3
[0031] Chemical composition of high magnesium phosphorus tailings: P 2 o 5 6.35%, MgO18.59%, CaO37.01%
[0032] Weigh 100g of magnesium and phosphorus tailings and calcinate at 960°C to obtain 60.5g of calcined white, and stir the calcined white and 430g of water at 85°C for 30 minutes to obtain a digestive solution. Supplement 900g of water into the digestive juice, and then pass gas with a volume fraction of 27% carbon dioxide into the digestive juice to carry out carbonization reaction at 30°C to obtain carbonized liquid, stop the reaction when the pH value of the carbonized liquid drops to 6.8, and separate the carbonized liquid The phosphate rock at the bottom is precipitated and filtered, the filtrate is heavy magnesium water, and the filter cake is dried to obtain the calcium carbonate product; add hydrofluoric acid to the obtained heavy magnesium water, mix and stir at a temperature of 90°C for a reaction time of 30 minutes, and mix Mg in the reaction solution after ...
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