Metal sludge kiln resource disposal flue gas purification process

Abstract

The invention relates to a metal sludge kiln resource disposal flue gas purification process, which includes the following steps: Step 1, the metal sludge hazardous waste is sent to a rotary kiln for drying, and the generated flue gas directly enters an ultra-high temperature bag filter Dust removal is carried out, and the collected dust is sent back to the rotary kiln for reuse; the sand produced by the rotary kiln in step 2 and step 1 is sent to the alloy furnace for smelting; the high-temperature flue gas produced by smelting is burned by carbon monoxide and the waste heat recovery boiler and then enters the super The high-temperature bag filter removes dust, and the collected dust is sent back to the rotary kiln for reuse; step 3, the flue gas treated in step 1 and step 2 is deacidified, denitrified, and dedioxin treated by the treatment system to achieve environmental protection The standard flue gas is discharged from the chimney. The invention adopts ultra-high temperature-resistant metal fiber bag dust collector or ceramic tube dust collector to collect dust, simplifies the cooling and deacidification protection processes before the conventional bag dust collector, and improves the material recovery efficiency.

Description

technical field [0001] The invention belongs to the technical field of metal sludge treatment, and in particular relates to a metal sludge kiln resource disposal flue gas purification process. Background technique [0002] Metal sludge hazardous waste materials include stainless steel sludge and electroplating sludge, whose main components are iron oxide, chromium oxide, nickel oxide, calcium oxide, calcium fluoride and a small amount of other heavy metal elements, and also contain a large amount of physical water and a small amount of crystallization water and hydrated water. Because of the high melting points of iron, chromium, nickel metals and alloys, rotary kilns are commonly used for treatment at present. The recovery effect of high melting point metals is not good, and waste gas will be generated when the rotary kiln treats sludge. At present, the waste gas is cooled by heat exchange and then passed through electrostatic dust removal. Wait for pre-dust removal and th...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a metal sludge kiln resource disposal flue gas purification process to solve the problem that the current process has a poor recovery effect on high melting point alloys, and the rotary kiln flue gas treatment process is relatively complicated, and the material recovery efficiency is low The problem

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