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

Active Publication Date: 2021-11-16
BEIJING GEOENVIRON ENG & TECH +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above-mentioned problems, the present invention solves the low pelletizing strength and uneven particle size faced by the existing nickel-containing sludge sintering pretreatment process, slow burning on the material layer during the sintering process, low efficiency, small processing capacity, low agglomeration rate, Due to technical problems such as poor agglomeration strength and excessive chromium content in sintered agglomerates, the present invention proposes a sintering pretreatment method for nickel-containing sludge, including:

Method used

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  • Nickel-containing sludge sintering pretreatment method

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Effect test

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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Abstract

The invention discloses a nickel-containing sludge sintering pretreatment method, and belongs to the technical field of nickel sludge pretreatment. The method comprises the following steps that nickel-containing sludge is dried; the dried nickel-containing sludge is mixed with dried copper-containing sludge, laterite-nickel ore and fuel to obtain a mixture; the mixture is pelletized to obtain a spherical mixture; the spherical mixture is put into sintering equipment to be sintered, and a sintered block is obtained; the mass ratio of the dried nickel-containing sludge to the dried copper-containing sludge to the laterite-nickel ore is (5-7):(2-4):(1-2), and the mass of the fuel accounts for 15%-18% of the mass of the mixture. The dried copper-containing sludge and the laterite-nickel ore are added, the content of metal chromium in the obtained sintered block is obviously reduced and can be stabilized to be 2.50% or below, and the adverse effect on the follow-up smelting process is obviously reduced.

Description

technical field [0001] The invention belongs to the technical field of nickel sludge pretreatment, in particular to a sintering pretreatment method of nickel-containing sludge. Background technique [0002] Nickel-containing sludge mainly comes from the wastewater treatment process of the metal surface treatment industry, which often contains a variety of heavy metals, with complex components and a moisture content as high as 60% to 70%. Heavy metal hydroxides such as nickel, copper, and chromium in nickel-containing sludge are in an unstable state. If they are randomly stacked, heavy metals are likely to dissolve again under the action of rainwater leaching, polluting soil or groundwater, and causing environmental and ecological damage. harm. Therefore, this type of sludge has been included in the "National Hazardous Waste List" (2021 Edition), and the hazardous waste category is HW17 (surface treatment waste). On the other hand, with the depletion of mineral resources, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/16C22B7/00C22B23/00
CPCC22B1/16C22B23/005C22B7/00Y02P10/20
Inventor 刘超霍成立杨文明王荀黄仙王志平庞杰
Owner BEIJING GEOENVIRON ENG & TECH
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