Complex innocent treatment method for heavy metal gypsum
A technology for harmless treatment of heavy metals, applied in protection devices against harmful chemicals, etc., can solve the problem of low toxicity of heavy metal leaching, and achieve the effects of low cost, low processing cost, and low energy consumption
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Embodiment 1
[0019] The heavy metal gypsum is mechanically ground to a particle size below 50 mesh; the heavy metal gypsum treated with the abrasive is added to the sulfuric acid leaching solution, the total hydrogen ion concentration is 0.8mol / L, and the liquid-solid ratio is 5ml / g during the acid leaching process , the leaching temperature is 30°C, and the leaching time is 60min, to obtain acid leaching slag and acid leaching solution; adjust the pH of the acid leaching solution to 6 with NaOH, precipitate flocculation and filter to obtain heavy metal slag and precipitation solution, and concentrate the heavy metal slag; Mix the slag and the precipitation solution and add sodium phosphate for phosphating and solidification. The amount of sodium phosphate added is 0.1mol / L, the ball milling time is 15min, the temperature is 40°C, the precipitate is flocculated and filtered to obtain the phosphating slag and phosphating solution; Lime is added to the chemical solution, the pH is adjusted to...
Embodiment 2
[0021] The heavy metal gypsum is mechanically ground to a particle size below 50 mesh; the heavy metal gypsum processed by the abrasive is added to the sulfuric acid extraction solution, and its total hydrogen ion concentration is 4mol / L. During the acid leaching process, the liquid-solid ratio is 7ml / g, The leaching temperature was 60°C, and the leaching time was 90 minutes to obtain acid leaching residue and acid leaching solution; the pH of the acid leaching solution was adjusted to 9 with NaOH, the precipitation was flocculated and filtered to obtain heavy metal slag and precipitation solution, and the heavy metal slag was treated centrally; the leaching residue was Mix with the precipitation solution and add sodium phosphate for phosphating and solidification. The amount of sodium phosphate added is 1mol / L, the ball milling time is 30min, the temperature is 40°C, the precipitate is flocculated and filtered to obtain phosphating residue and phosphating solution; the phosphat...
Embodiment 3
[0023] The heavy metal gypsum is mechanically ground to a particle size below 50 mesh; the heavy metal gypsum treated with the abrasive is added to the sulfuric acid leaching solution, and the total hydrogen ion concentration is 3.5mol / L. During the acid leaching process, the liquid-solid ratio is 10ml / g , the leaching temperature was 50°C, and the leaching time was 80min to obtain acid leaching residue and acid leaching solution; the pH of the acid leaching solution was adjusted to 7 with NaOH, the precipitation was flocculated and filtered to obtain heavy metal slag and precipitation solution, and the heavy metal slag was treated centrally; The slag is mixed with the precipitation solution and added with sodium monohydrogen phosphate for phosphating solidification. The amount of sodium monohydrogen phosphate added is 0.4mol / L, the ball milling time is 60min, and the temperature is 50°C. The precipitate is flocculated and filtered to obtain phosphating slag and phosphating Lim...
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