Method for extracting white carbon black from mine tailing
A technology for silica and tailings, applied in the chemical industry, can solve the problems of high process cost, difficult extraction, and failure to make great progress, and achieve the effects of simple and scientific process, cost reduction, and strong industrial application value.
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Embodiment 1
[0021] (1) Roasting with alkali and molten salt: Take 100g of Baiyan Obo tailings, add 200g of sodium hydroxide and 100g of molten salt and mix well, then roast at 700°C for 2 hours;
[0022] (2) Water immersion: Use ordinary industrial water to stir and water immerse the roasted and decomposed minerals. The leaching temperature is 85°C and the water immersion time is 0.25h;
[0023] (3) Filtration: after immersion in water, filter and wash until the filtrate is neutral to obtain washing liquid and washing residue, and the washing liquid is a solution containing sodium silicate;
[0024] (4) Add hydrochloric acid to adjust the pH: the concentration of hydrochloric acid is 2.4mol / L, and the pH is adjusted to about 7. In a water bath at 95°C and stirred at 500r / min, white carbon black is prepared by precipitation method, and the prepared white carbon black is filtered and washed with water. , drying, the recovery rate of silicon is 71.25%.
Embodiment 2
[0026] (1) Roasting with alkali and molten salt: Take 100g of Baiyun Obo tailings, add 240g of sodium hydroxide and 100g of molten salt and mix well, then roast at 700°C for 2 hours;
[0027] (2) Water immersion: Use ordinary industrial water to stir and water immerse the roasted and decomposed minerals. The leaching temperature is 85°C and the water immersion time is 0.25h;
[0028] (3) Filtration: after immersion in water, filter and wash until the filtrate is neutral to obtain washing liquid and washing residue, and the washing liquid is a solution containing sodium silicate;
[0029] (4) Add hydrochloric acid to adjust the pH: the concentration of hydrochloric acid is 2.4mol / L, and the pH is adjusted to about 7. In a water bath at 95°C and stirred at 500r / min, white carbon black is prepared by precipitation method, and the prepared white carbon black is filtered and washed with water. , drying, the recovery rate of silicon is 74.74%.
Embodiment 3
[0031] (1) Roasting with alkali and molten salt: Take 100g of Baiyun Obo tailings, add 260g of sodium hydroxide and 100g of molten salt and mix well, then roast at 700°C for 2 hours;
[0032] (2) Water immersion: Use ordinary industrial water to stir and water immerse the roasted and decomposed minerals. The leaching temperature is 85°C and the water immersion time is 0.25h;
[0033] (3) Filtration: after immersion in water, filter and wash until the filtrate is neutral to obtain washing liquid and washing residue, and the washing liquid is a solution containing sodium silicate;
[0034] (4) Add hydrochloric acid to adjust the pH: the concentration of hydrochloric acid is 2.4mol / L, and the pH is adjusted to about 7. In a water bath at 95°C and stirred at 500r / min, white carbon black is prepared by precipitation method, and the prepared white carbon black is filtered and washed with water. , drying, the recovery rate of silicon is 78.43%.
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