System for capturing semi-volatile heavy metal in zinc-containing solid waste through high-temperature separation in cooperation with ammonium complexation

Abstract

The invention provides a system for capturing semi-volatile heavy metal in zinc-containing solid waste through high-temperature separation in cooperation with ammonium complexation. The system comprises a pretreatment unit, a gas treatment unit and a solid treatment unit, wherein the pretreatment system comprises a reduction oxidation device and a gas-solid separation device which are sequentiallyconnected, a gas outlet of the gas-solid separation device is connected with the gas treatment unit, a solid outlet of the gas-solid separation device is connected with the solid treatment unit, thesolid treatment unit comprises a leaching device, a purification device and an electrolysis device which are sequentially connected, the gas treatment unit comprises a gas absorption device, an absorption liquid inlet of the gas absorption device is connected with an electrolyte outlet of the electrolysis device, and an absorption liquid outlet of the gas absorption device is connected with the leaching device. By means of the system, full-amount recovery of zinc is achieved, no leaching residues are discharged, the purification effect is achieved, and guarantee is provided for obtaining the high-purity zinc.

Description

technical field [0001] The invention belongs to the technical field of solid waste utilization, and relates to a system for capturing semi-volatile heavy metals in zinc-containing solid waste, in particular to a system for capturing semi-volatile heavy metals in zinc-containing solid waste through high-temperature separation and ammonium network. Background technique [0002] According to the volatility of heavy metals, they can be divided into volatile heavy metals, semi-volatile heavy metals and non-volatile heavy metals. Semi-volatile heavy metals refer to heavy metals such as Pb, Cd, Zn, etc. These heavy metals will volatilize into the flue gas when they reach a certain temperature, and then similar nucleation and heterogeneous condensation will occur during the condensation of the flue gas to form fine particles Or it is enriched in fine particles and finally can be captured. [0003] Domestically, the commonly used technological process for processing low-grade zinc m...

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Problems solved by technology

This process has the following disadvantages: 1. The operation is discontinuous and the production efficiency is low; 2. The operating environment is harsh and the labor intensity is high. Working in a high-dust environment for a long time, the operation process is easy to cause occupational diseases of the respiratory system; 3. Alkaline cleaning process The efficiency of defluorination and chlorine is low, and the amount of fluorine and chlorine-containing wastewater produced is large, which is difficult to recycle, causing a great waste of water resources; it is easy to cause secondary pollution; 4. High operating costs and large investment in equipment;

5. Construction machinery and production equipment are easily corroded and damaged by acid-containing gas, and the maintenance cost is high; 6. The dust collection bag is easy to block, the replacement cycle is frequent, and the cost is high; fine dust is easy to float in the air through the bag, which is harmful to the health of workers Cause harm and pollute the environment; 7. Dust collection needs to be packaged and transported to the zinc leaching system. Dust floats during the transportation process and pollutes the environment. The above-mentioned process can no longer meet the future national requirements for environmental protection, energy, and sanitation.

However, the patent does not disclose the method of adding crude zinc oxide to the pulping device

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