Nickel-containing sludge sintering pretreatment method
A technology for pretreatment and sludge, applied in the direction of improving process efficiency, can solve the problems of high chromium content in agglomerates, slow burning on the material layer, low pelletizing strength, etc., to reduce treatment costs, improve agglomeration rate, The effect of improving sintering efficiency
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Embodiment 1
[0028] The moisture content of the nickel-containing sludge after drying is 24%, the organic matter content of the copper-containing sludge after drying is 33%, and the laterite nickel ore SiO 2 The content is 43%; in the mixture, the nickel-containing sludge after drying accounts for 50%, the copper-containing sludge after drying accounts for 40%, and the laterite nickel ore accounts for 10%. The fuel used is coke powder with a fixed carbon content of 81.2%, and the added weight ratio is 15.00% of the mass of the mixture. Using a disc granulator to produce balls with a particle size of 10mm-20mm, the balls are fed into a horizontal sintering furnace for sintering. The daily processing capacity is 126 tons, and the agglomeration rate is 74.5%. The chromium content of the sintered agglomerate is 2.15%.
Embodiment 2
[0030] The moisture content of the nickel-containing sludge after drying is 35%, the organic matter content of the copper-containing sludge after drying is 31%, and the laterite nickel ore SiO 2 The content is 38%; the dried nickel-containing sludge in the mixture accounts for 60%, the dried copper-containing sludge accounts for 30%, and the laterite nickel ore accounts for 10%. The fuel used is coke powder with a fixed carbon content of 81.2%, and the addition ratio is 15.30% of the mass of the mixture. Using a disc granulation machine to produce balls with a particle size of 10mm-20mm, the balls are fed into a horizontal sintering furnace for sintering. The daily processing capacity is 117 tons, and the agglomeration rate is 74.2%. The chromium content of the sintered agglomerate is obtained. 2.37%.
Embodiment 3
[0032] The moisture content of the nickel-containing sludge after drying is 41%, the organic matter content of the copper-containing sludge after drying is 28%, and the laterite nickel ore SiO 2 The content is 33%. In the mixture, the nickel-containing sludge after drying accounts for 60%, the copper-containing sludge after drying accounts for 25%, and the laterite nickel ore accounts for 15%. The fuel used is coke powder, with a fixed carbon content of 81.2%, and the addition ratio is 15.75% of the mass of the mixture. Using a disc granulation machine to produce balls with a particle size of 10mm-20mm, the balls are fed into a horizontal sintering furnace for sintering. The daily processing capacity is 110 tons, and the agglomeration rate is 80.2%. The chromium content of the sintered block is obtained. 2.03%.
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