Cooperative treatment method for waste incineration fly ash and copper-containing sludge

Abstract

The invention relates to a cooperative treatment method for waste incineration fly ash and copper-containing sludge. The waste incineration fly ash and the copper-containing sludge are mixed uniformly and pelleted to obtain a ball material; the ball material, a fluxing agent and fuel are mixed to obtain a mixture; smelting is carried out to obtain molten slag and smoke; when the ball material is a high-chlorine material, the molten slag is subjected to water quenching, and glass tailings are obtained; soot in the smoke is collected, the soot is sequentially subjected to water washing and solid-liquid separation, supernatant is obtained, then alkali is added into the supernatant, and sediment rich in copper and nickel is obtained; and when the ball material is a low-chlorine material, dilution treatment is carried out on the molten slag to obtain a slag phase and matte, and then water quenching is carried out on the slag phase to obtain glass tailings. In the invention, a binder does not need to added for pelleting in the treatment of the waste incineration fly ash, additional drying equipment does not need to be added in the treatment of the copper-containing sludge, and the two materials are co-treated, so that the process flow and the investment cost are greatly reduced.

Description

technical field [0001] The invention relates to a method for synergistic treatment of waste incineration fly ash and copper-containing sludge, and belongs to the technical field of harmless and resourceful comprehensive disposal of hazardous waste. Background technique [0002] There are currently three main disposal methods for domestic waste: (1) cement solidification landfill, (2) chemical agent stabilization technology, and (3) heat treatment technology. However, due to the increasing amount of garbage, the increasing shortage of land resources, and the inability to effectively recycle valuable components in domestic waste, the heat treatment process of domestic waste has gradually become the mainstream. However, in the process of waste incineration, a large amount of secondary pollutants will also be produced, such as exhaust gas and fly ash. According to the data, the generation of fly ash accounts for about 3-5% of the amount of incinerated waste. Due to the large ba...

AI Technical Summary

Problems solved by technology

However, due to the increasing amount of garbage, the increasing shortage of land resources, and the inability to effectively recycle valuable components in domestic waste, the heat treatment process of domestic waste has gradually become the mainstream.

However, in the process of waste incineration, a large amount of secondary pollutants will also be produced, such as exhaust gas, fly ash, etc.

According to the data, the generation of fly ash accounts for about 3-5% of the amount of incinerated waste. Due to the large base of waste incineration, the amount of incineration fly ash produced every year has reached a scale that cannot be ignored. The dioxin contained in the fly ash And the high chlorine content has also become an important obstacle for the effective treatment of fly ash; in addition, the content of valuable metals such as copper and nickel in fly ash is low, enrichment is difficult, and the recovery cost is high

[0003] Copper-containing sludge mainly comes from electroplating, printing and dyeing, metal processing and other industries. The valuable metals have low grade and complex components, which makes it difficult to treat. At present, this kind of sludge is mainly treated by stockpiling. It takes up a lot of land resources, and if it is not handled properly, it will cause the heavy metal components in the sludge to enter the soil, which will cause immeasurable damage to the surrounding ecological environment

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