A kind of rotary kiln redox volatilization method containing germanium, indium and zinc raw materials
A rotary kiln and raw material technology, applied in the field of redox volatilization of rotary kiln, can solve the problems of increased energy consumption, high slag melting temperature, easy kiln closure, frequent maintenance and other problems, to achieve increased alkalinity, reduced silicon dioxide wrapped germanium, Favorable effect of alkaline production
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Embodiment 1
[0032] The zinc leaching slag produced by an enterprise contains 8.5% zinc, 0.015% germanium, 0.035% indium, and 5.3% silicon dioxide. The dry weight of the zinc leaching slag is mixed with coke powder according to 40% of the dry weight of the zinc leaching slag, and then calcium oxide / silica = 1.1 Add calcium oxide and mix evenly, add water and stir to make the water content of the material 12%; granulate through a disc granulator to make the particle size 10-50mm, and add to the rotary kiln while granulating; the feeding amount is 3t / h.
[0033] The length of the feeding and preheating section (kiln tail) of the rotary kiln is 15% of the total length, the temperature is 850±10°C, the length of the oxidation-reduction reaction section (in the kiln) accounts for 75% of the total length, the temperature is 1250±20°C, and the cooling and slag discharge section (kiln The kiln head) accounts for 10% of the total length, and the temperature is 900±10°C; the kiln head is equipped wit...
Embodiment 2
[0036] A low-grade zinc oxide ore contains 12.5% of zinc, 0.0058% of germanium, 0.0072% of indium, 5.8% of calcium oxide, 18.2% of silicon dioxide, and 1.8% of iron; after grinding to 100 mesh, it is mixed with reduced coal at 42% by weight, Add calcium oxide and mix evenly according to alkaline matter / acidic matter = 1.1, spray water to granulate, the water content of raw material granules is 15%, add to the rotary kiln, control the length of the kiln tail to be 18% of the total length, and the temperature is 880-900°C. The length of the kiln is 70% of the total length, the temperature is 1300±10°C, the length of the kiln head is 12% of the total length, the temperature is 950°C-970°C; the air blast pressure is 4.5kg / ㎡, and the air volume is 420m 3 / ton of raw materials; gas blowing pressure 1kg / ㎡, consumption 100m 3 / ton of raw materials; the oxygen content of oxygen-enriched air is 45%, the blowing pressure is 2kg / ㎡, and the air volume is 230m 3 / ton of raw materials;...
Embodiment 3
[0038] Carry out conventional rotary kiln redox volatilization test with the raw materials of Example 1 and Example 2 respectively, control the alkalinity of the raw materials into the furnace to be 0.85-0.9, moisture 5-8%, control the kiln tail to be 10-15% of the total length, and the temperature to be 700-800°C ; In the kiln, the total length is 75-80%, the temperature is 1200-1300°C, and the kiln head is 5-10% of the total length, and the temperature is 900±10°C. The air blown into the kiln head has a wind pressure of 4.5kg / ㎡ and an air volume of 500m 3 / ton of raw materials, no coal gas and oxygen-enriched air are blown in, the negative pressure of flue gas discharge is 50Pa, and the zinc oxide dust obtained by dust collection contains 45.5%, 47.3% zinc, 0.018% germanium, 0.0063%, 0.021% indium, 0.008%; kiln slag Zinc content is 1.25%, 1.32%, germanium 0.085%, 0.0092%, indium 0.093%, 0.0062%.
[0039] In order to improve the volatilization recovery rate of germanium and...
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