Zinc slag melting and liquating method and device

Abstract

The invention discloses a zinc slag melting and liquating method and device. Zinc slag is thrown into a smelting furnace to be molten, a protective medium and aluminum are thrown into the smelting furnace, and the aluminum and the liquid zinc slag are fully mixed; the temperature is constant for a period of time, zinc liquid on the bottom layer and floating slag on the upper layer are fully separated through a slagging-off mechanism, and the zinc liquid is discharged to an ingot casting device to be cooled to form a zinc ingot; and the floating slag is fed to be dissolved and subjected to ironremoval and then is fed into an electrolytic cell to be electrolyzed or is directly fed into the electrolytic cell to be electrolyzed, the iron in the floating slag is dissolved in a dissolving tank,deposits and is dried and then is directly used for iron making, a solution inside the dissolving tank is conveyed into the electrolytic cell, zinc generated after electrolysis returns to the smelting furnace after being washed and dried, waste acid in the electrolytic cell can be conveyed into the dissolving tank to be used, and aluminum in the electrolyte is separated by distillation and crystallization or the simple aluminum is obtained in a molten salt electrolysis mode and then is added into the smelting furnace. The method provided by the invention can reduce the raw materials, energy consumption and the investment on the premise of meeting the product requirements.

Description

technical field [0001] The invention relates to the technical field of zinc slag melting equipment, in particular to a method and device for melting and melting zinc slag. Background technique [0002] At present, the methods for purifying zinc from hot-dip galvanizing slag mainly include wet method and fire method. Among them, the fire method is mainly represented by vacuum distillation, which utilizes the low boiling point of zinc (906°C) It is volatilized and rectified to obtain refined zinc (purity can reach more than 99%). The main equipment of the fire process is a vacuum distillation device, but the equipment occupies a large area and requires high corrosion resistance and sealing. The main equipment of the wet method is a set of zinc slag remelting electrolysis device, which is separated and purified by electrolysis, and the zinc precipitated at the cathode is melted and processed into zinc ingots. Due to the particularity of hot-dip galvanizing slag, whether it is...

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Problems solved by technology

Due to the particularity of hot-dip galvanizing slag, whether it is vacuum distillation or electrolysis, energy consumption is relatively high, waste discharge is large, environmental pollution is serious, and the production cost is high

[0003] For example, the patent No. 91101840.9 is a Chinese invention patent titled "Method for Extracting Zinc by Vacuum Distillation of Hot-dip Galvanizing Slag and Its Equipment". The main defects of the vacuum distillation and purification of zinc slag are: the energy consumption per ton of zinc is more than 2,000 yuan, and the output is 30 About per ton per hour, the efficiency is low; for example, the patent No. 200710159251.4 is a Chinese invention patent named "zinc slag purification method and purification device". The feeder is sent to the rectification tower whose combustion chamber temperature is 1000-1300°C for distillation, and the evaporated zinc vapor is condensed into pure zinc liquid through a condenser with a temperature of 700-850°C, flows into the zinc storage tank, and is cast into No. 0 zinc ingot; the unevaporated zinc liquid in the rectification tower flows into the melting furnace through the lower extension. The zinc slag ash is discharged from the slag outlet, and the B-number zinc is transported back to the melting furnace to enter the next cycle

This method can produce No. 0 zinc, but the patented method and device are only suitable for hot-dip galvanizing slag with a zinc content of more than 99%, and the purification rate can reach more than 80%, and the output rate is low; the energy medium in the device Mixing gas for coke ovens and blast furnaces has potential safety hazards of CO poisoning; in addition, iron components will corrode silicon carbide trays, and the life cycle of rectification towers is generally within ten months, with high maintenance costs; The output is shut down, which directly leads to an increase in production costs

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