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Method for producing zinc alloy from zinc dross

A zinc alloy and zinc slag technology, applied in the field of hot-dip galvanized zinc slag recycling, can solve problems such as consumption, inability to fundamentally eliminate, excessive energy consumption, etc., and achieve low energy consumption, high production efficiency, and production operation The effect of cost reduction

Active Publication Date: 2007-12-26
BAOSHAN IRON & STEEL CO LTD
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0006] There are many types of regeneration and purification processes for zinc slag at home and abroad, but whether it is fire method or wet method, a single method has its own weaknesses that are difficult to overcome
The traditional fire purification process is to completely separate the zinc in the zinc slag from other impurities by evaporation, and then cooperate with steam collection equipment to obtain regenerated zinc. This method is applicable to zinc slag with low zinc content, but This process consumes excessive energy for up to 90% of hot-dip galvanizing dross
Similarly, the wet process also has a similar phenomenon of excessive energy consumption
[0007] Both the fire method and the wet method are very mature in technology, but there are still some defects that cannot be fundamentally eliminated

Method used

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  • Method for producing zinc alloy from zinc dross

Examples

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Effect test

Embodiment 1

[0023] Using 2030 hot-dip galvanizing waste slag, its main chemical composition is as follows: Al 3.1%, Pb 0.15%, Fe 1.3%, Zn 94.5%, Cd 0.11%.

[0024] Combined with the process flow chart shown in Figure 1, take 5 kg of zinc slag and 100 grams of aluminum flakes into the furnace, heat to 550 ℃, constant temperature to completely melt, and then mechanically stir to make the liquid part uniformly mixed. In this process, the furnace uses Sealing measures, only set up flue gas cooling channels, reduce the occurrence of oxidation or other reactions. Then reduce the furnace temperature to 475°C at a rate of 5°C / min, and then keep it at a constant temperature for 5 minutes to ensure that the zinc liquid and scum are fully separated. Take the surface scum into a special mold and enter it into the subsequent vacuum furnace for purification. The liquid part was poured into the ingot and weighed after cooling to obtain 3.9 kg of zinc ingot, with a zinc content of 98.3% and an aluminum conte...

Embodiment 2

[0032] If the zinc content of the zinc slag is less than 90%, it first enters the double vacuum zinc slag purification furnace for processing, and the regenerated zinc is obtained on the crystallizer, and the residue is left in the material basket. The regenerated zinc on the crystallizer was mechanically peeled off and directly transported to the furnace, and the steps in Example 1 were repeated.

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Abstract

This invention relates to a method for producing zinc alloy from zinc slag. The method comprises: heating zinc slag and aluminum to 500-600 deg.C in a smelter to completely melt, cooling to a certain temperature to adequately separate zinc-aluminum melt from floating residues, cooling the zinc-aluminum melt, processing into zinc-aluminum ingots, treating the floating residues in a double-vacuum purification furnace to obtain regenerated zinc in a crystallizer and residues kept in a material basket, mechanically separating regenerated zinc from the crystallizer, directly conveying into the smelter, melting, ingotting, collecting the residues, adding an appropriate amount of carbon powder, treating above 600 deg.C in the double-vacuum purification furnace to completely reduce volatile components (zinc and tin) in the residues, separating, recovering, and separating the final product from tailings in the crystallizer. By combining melt ingoting and vacuum distillation, the method has such advantages as low energy / material loss, little waste generation, little pollution and recycleable byproducts.

Description

Technical field [0001] The invention relates to a technology for recycling hot-dip galvanized zinc slag, in particular to a method for producing zinc alloy by using zinc slag. Background technique [0002] Hot-dip galvanizing zinc slag recycling technology currently has two major types of processes, wet method and fire method, and there are many specific methods. [0003] The main equipment of the wet process is a set of solution electrolysis device, which can obtain zinc with higher purity. The disadvantage is that the process is complicated, the electrolyte must be fully purified, the operation of impurity separation is difficult, and the energy and material consumption are increased. Strictly controlling the electrolysis conditions and the selectivity and efficiency of the precipitating agent will inevitably increase the difficulty of operation. [0004] The more advanced equipment of the pyrotechnic process is the vacuum distillation device and the molten salt electrolysis de...

Claims

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Application Information

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IPC IPC(8): C22C1/00C22B7/04C22B9/02C22C18/00
CPCY02P10/20
Inventor 任玉森
Owner BAOSHAN IRON & STEEL CO LTD
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