Zinc oxide concentrate curing and leaching method
A zinc oxide and leaching technology, applied in the field of metallurgy, can solve the problems of a large number of bubbles, difficult to eliminate and so on
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Embodiment 1
[0027] A method for slaking and leaching zinc oxide concentrate comprises the following steps:
[0028] 1) Add 40% by weight of concentrated sulfuric acid to 270 g of flotation zinc oxide concentrate with a water content of 25%, and age at room temperature for 60 minutes.
[0029] 2) Add water to the matured material for neutral leaching, the liquid-solid ratio is 4:1, the temperature is 50°C, the leaching time is 2h, and H 2 o 2 After oxidizing and removing iron for 30 minutes, the middle and supernatant (pH 5.0, Zn 68g / L, Fe 16mg / L) and underflow were obtained by separating through the thickener.
[0030] 3) Add 500mL of spent electrolyte and 15mL of concentrated sulfuric acid to the underflow for acid adjustment and leaching. The leaching temperature is 80°C, the leaching time is 3h, the liquid-solid ratio is 8:1, and the final acid concentration is 50g / L. The filter residue (containing Zn 4.05%, enter the slag storehouse) and the first filtrate (Zn 92g / L, H 2 SO 4 38g...
Embodiment 2
[0033] A method for slaking and leaching zinc oxide concentrate comprises the following steps:
[0034] 1) Add 50% by weight of concentrated sulfuric acid to 270 g of flotation zinc oxide concentrate with a water content of 25%, and age at room temperature for 80 minutes.
[0035] 2) Add water to the matured material for neutral leaching, the liquid-solid ratio is 5:1, the temperature is 50°C, the leaching time is 2h, and H 2 o 2 Oxidize and remove iron for 40 minutes, and separate the middle and supernatant (pH 5.0, Zn 65g / L, Fe 16mg / L) and underflow through the thickener, and the middle and supernatant are purified, electrowinning, and melted to produce zinc ingots.
[0036] 3) Add 500mL of spent electrolyte and 15mL of concentrated sulfuric acid to the underflow for acid adjustment and leaching. The leaching temperature is 80°C, the leaching time is 4h, the liquid-solid ratio is 6:1, and the final acid concentration is 30g / L. The filter residue (containing Zn 3.85%, enter...
Embodiment 3
[0039] A method for slaking and leaching zinc oxide concentrate comprises the following steps:
[0040] 1) Add 25% by weight of concentrated sulfuric acid to 270 g of flotation zinc oxide concentrate with a moisture content of 25%, and ripen it for 90 minutes at normal temperature;
[0041] 2) Add water to the matured material for neutral leaching, the liquid-solid ratio is 3:1, the temperature is 50°C, the leaching time is 3h, and H 2 o 2 Oxidize and remove iron for 20 minutes, and separate the supernatant (pH 5.0, Zn 56g / L, Fe 18mg / L) and underflow through thickener separation.
[0042] 3) Add 500mL of spent electrolyte and 40mL of concentrated sulfuric acid to the underflow to adjust the acid leaching. The leaching temperature is 80°C, the leaching time is 3h, the liquid-solid ratio is 8:1, and the final acid concentration is 42g / L. After the leaching is completed, it is separated by pressure filtration Obtain filter residue (containing Zn 4.85%, enter residue storehouse)...
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