Recycling treatment method of fly ash, chrome slag and electroplating sludge hazardous waste

Abstract

The invention relates to a recycling treatment method of a fly ash, a chromium slag and an electroplating sludge dangerous waste. The method includes following steps: adding an additive, which consists of pulverized coal, or carbon black, and calcium oxide, to dangerous waste with mixing uniformly; feeding a material into a primary pelletizing device with addition of an additive consisting of iron oxide red, bentonite, polyacrylamide, calcium sulfate and sodium carbonate with mixing uniformly and carrying out a primary pelletizing process; sieving pellets, wherein the pellets with granularities being larger than 5 mm are subjected to a secondary pelletizing process and the pellets with the granularities being smaller than 5 mm are fed back to the primary pelletizing device for continuous pelletization; feeding the pellets to the second pelletizing device with addition of calcium oxide and carrying out the second pelletizing process according to a technological process; coating surfaces of the pellets with a layer of an additive; feeding the pellets which are subjected to the second pelletizing process into a cement kiln or a sintering device for carrying out a roasting process. The method is clean and effective, can allow organic substances to be decomposed fully, can solidify heavy metals, is free of residual ash slag and secondary pollution and is energy-saving and environmental-protective. Combustibles in the waste release heat when being burnt so that original fuel is saved. Carbon dioxide generated in combustion is reduced and the greenhouse effect is reduced.

Description

technical field [0001] The invention relates to a method for harmless and resourceful treatment of hazardous waste, in particular to a method for resourceful treatment of fly ash, chromium slag and electroplating sludge. Background technique [0002] In order to properly solve the problem of urban domestic waste, waste incineration power generation has shown a good momentum of development across the country, but the residue produced by waste incineration—fly ash contains heavy metals (lead, cadmium, mercury, etc.) and dioxins, heavy metal lead (Pb) The content of cadmium (Cd) is 738-79500mg / kg; the content of cadmium (Cd) is 4-573mg / kg; the content of dioxin is 1000-50000ng-TEQ / kg, which cannot meet the environmental protection requirements. The toxicity is more than 1,000 times that of potassium cyanide, and long-term intake can cause cancer and deformity even in extremely small amounts. If not handled properly, it will pose a serious threat to people's living environment....

AI Technical Summary

Problems solved by technology

[0007] How to deal with hazardous wastes such as fly ash, chromium slag, electroplating sludge (tannery sludge) due to their hazardous characteristics such as high toxicity, flammability, strong corrosion and strong infectivity, which will cause continuous damage to soil, atmosphere and water Sexual pollution is difficult to eliminate, how to deal with it in a harmless and resourceful way is an urgent problem to be solved

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