Harmless disposal method for solid hazardous waste phosphated residue
A technology of harmless treatment and hazardous waste, applied in the direction of solid waste removal, etc., can solve the problems of a large amount of alkaline waste water, high treatment cost, environmental pollution, etc., and achieve obvious environmental protection and economic benefits.
Active Publication Date: 2014-05-28
湘潭市双马世纪新材料有限公司
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The sediment produced during the phosphating process is phosphating slag, which belongs to solid hazardous waste. The waste category is: HW17 surface treatment waste, and the waste code is: 346-064-17. Its composition contains Fe(+3) 27.5%, Zn(+2)2.35%, PO 4 (-3) 51.8%; In the past, these slags were discarded or discharged with water, causing environmental pollution
The existing treatment method for phosphating slag is to use sodium hydroxide neutralization method, which consumes a large amount of energy and water, and produces a large amount of alkaline waste water, which causes secondary pollution to the environment. Large investment, large floor area, high treatment cost, and the value of the treatment product trisodium phosphate is not high, causing a large economic burden to the enterprise
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[0012] Such as figure 1 As shown, a harmless treatment method for solid hazardous waste phosphating slag, taking the phosphating slag from the phosphating workshop of an automobile production plant, after analyzing the phosphating slag, Fe +3 28.5%, Zn +2 3.2%, phosphate PO 4 -3 52.8%, the rest are impurities;
[0013] (1), removal of impurities;
[0014] (2) Ball mill in a ball mill according to the ratio of phosphating slag: water = 1:1~2, until the phosphating slag is ≥ 400 mesh;
[0015] (3), liquid-solid separation;
[0016] (4) Dry the solid to achieve a moisture content below 1%, sieve through 400 mesh, and contain Fe +3 45%, containing Zn +2 20%, used as anti-rust filler, and the remaining part returned to the ball mill to continue ball milling;
[0017] (5) Multi-stage precipitation of the liquid, vacuum filtration to remove impurities, heating and concentration, containing phosphate PO 4 -3 70% as supplementary solution for phosphating solution.
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The invention discloses a harmless disposal method for solid hazardous waste phosphated residue, and the harmless disposal method comprises the following steps: (1), removing impurities; (2), ball-milling in a ball mill according to the proportion that: phosphated residue to water equals to 1 to 1-2, milling until the phosphated residue is equal to or greater than 400 meshes; (3), carrying out liquid-solid separation; (4), carrying out drying treatment to the solid until the moisture content is lower than 1 percent, and using the dried solid as a rust-proof filler; (5), carrying out concentration treatment to the liquid so as to use the liquid as a replenisher for a phosphating solution. The harmless disposal method provided by the invention has the technical effects that effective components in the phosphated residue are fully used, secondary pollution cannot be produced during the treatment process, and the harmless disposal method has obvious environmental protection benefits and economic benefits.
Description
technical field [0001] The invention relates to a harmless treatment method for solid hazardous waste phosphating slag. Background technique [0002] Phosphating is a commonly used surface treatment technology, which is widely used in industries such as automobiles, chemicals, ships, aerospace and household appliances. The sediment produced in the phosphating process is phosphating slag, which belongs to solid hazardous waste. The waste category is: HW17 surface treatment waste, and the waste code is: 346-064-17. Its composition contains Fe(+3) 27.5%, Zn(+2)2.35%, PO 4 (-3) 51.8%; In the past, these slags were discarded or discharged with water, causing environmental pollution. However, the existing treatment method for phosphating slag is to use sodium hydroxide neutralization method, which consumes a large amount of energy and water, and produces a large amount of alkaline waste water, which causes secondary pollution to the environment. The investment is large, the are...
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IPC IPC(8): B09B3/00B09B5/00
Inventor 左伏根
Owner 湘潭市双马世纪新材料有限公司