Treatment method for harmless reclamation of solid waste of heavy metal

A treatment method and recycling technology, applied in the field of harmless recycling of heavy metal solid waste, can solve the problems of scattered solid waste utilization business operations, high equipment maintenance costs, short service life, etc., and achieve recycling and comprehensive utilization , Reduce maintenance costs, reduce production costs

Active Publication Date: 2012-07-11
唐锡中
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AI Technical Summary

Problems solved by technology

[0014] (2) The industrial solid waste treatment capacity is seriously insufficient:
[0017] (3) The cost of industrial solid waste treatment is high, and there are technical problems:
For example, Hualing Group mainly treats its blast furnace waste by bagging the gas ash, and then mixing the collected waste with iron ore raw materials into the smelting furnace for smelting. Although this method can reduce the impact of solid waste on Environmental pollution, but the mixed smelting of recycled gas ash and iron ore will cause iron ore raw materials to agglomerate and adhere to the inner wall of the smelting furnace, affecting the heating effect and the quality of steel products, and reducing the service life of the smelting furnace
Technical problems have plagued large smelting enterprises like Zhuzhou Smelter for a long time, which is also the main reason why it is difficult to effectively treat solid waste
[0020] (4) Both the government and enterprises lack effective management of industrial solid waste treatment and comprehensive utilization:
[0022] 1. The treatment of solid waste by polluting enterprises is generally handled by subordinate auxiliary units or entrusted to external private enterprises. These enterprises have low barriers to entry and are characterized by miniaturization, diversification, privatization, and labor-intensive. Decentralization of solid waste utilization business operations
Relatively backward treatment technology, it is easy to cause secondary pollution
[0023] 2.

Method used

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  • Treatment method for harmless reclamation of solid waste of heavy metal
  • Treatment method for harmless reclamation of solid waste of heavy metal
  • Treatment method for harmless reclamation of solid waste of heavy metal

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Example Embodiment

[0051] The invention provides a treatment method for the harmless recycling of heavy metal solid waste. The invention provides a treatment method for the harmless recycling of heavy metal solid waste. The rotary kiln is used for the harmless and resourceful treatment of heavy metal solid waste.

[0052] like figure 1 As shown, the specific treatment method is: coal-free low calorific value solid waste mixture is burned at high temperature in a rotary kiln to produce secondary zinc oxide, the temperature in the high temperature zone of the rotary kiln reaches 1300 ° C, and other valuable metals are enriched at the same time; the iron-containing waste slag produced by the rotary kiln As raw material for iron selection to produce iron powder; use secondary zinc oxide as raw material, produce zinc sulfate monohydrate through acid leaching and neutralization, produce red iron slag of zinc sulfate monohydrate as raw material of secondary zinc oxide, and produce leaching residue of z...

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Abstract

The invention discloses a treatment method for harmless reclamation of solid waste of heavy metal, comprising the following steps: adding coal-free solid waste mixture with low heat value to a rotary kiln for harmless reclamation of solid waste of heavy metal; combusting the solid waste mixture at a high temperature in the rotary kiln to produce zinc hypoxide and gather other valued metals; producing iron powders from the iron-containing slag that is generated in the rotary kiln as iron screening raw material; using zinc hypoxide as raw material to conduct acid leaching for neutralization to produce zinc sulfate monohydrate, then using the red iron slag that produces zinc sulfate monohydrate as the raw material for zinc hypoxide and leaching the leached slag that produces zinc sulfate monohydrate with high acid to reclaim indium ingot; after reclamation of the indium ingot, smelting the leached slag as raw material of lead to produce lead ingot; and recovering the water-hardening slag that produces lead ingot as the raw material for zinc hypoxide. The treatment method of the invention realizes zero discharge of waste water and slag, which not only saves the energy, but also realizes reclamation and comprehensive utilization of the resources and greatly lowers the production cost of the companies so as to create a core competence of the company.

Description

technical field [0001] The invention relates to a treatment method for harmless and resourceful heavy metal solid waste. Background technique [0002] my country itself is a resource-poor country. It consumes 5 million tons of zinc metal every year, while the mining volume is only 4 million tons. The gap of 1 million tons mainly depends on imports and comprehensive resource recovery. Imports require large amounts of foreign exchange. [0003] At present, various domestic smelting, chemical and iron and steel enterprises produce tens of millions of tons of solid waste containing heavy metals annually. Domestic enterprises in the same industry can only process solid waste with high zinc content and useful value. The mixture generally requires zinc content greater than 10%, calorific value greater than 2000 kcal / kg, a large number of low-grade solid wastes containing heavy metals are dumped and landfilled, which not only wastes resources, but also pollutes the environment. ...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B13/00C22B58/00C22B19/30C22B19/00
CPCY02P10/20
Inventor 唐锡中
Owner 唐锡中
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