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Method for recycling zinc from smelting waste residues

A technology of waste slag and coordination, applied in the field of metallurgy, can solve the problems of increasing the steps of zinc recovery and affecting the application, so as to reduce the consumption of ammonia water and avoid the effect of dissolution

Active Publication Date: 2020-11-13
LIUPANSHUI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the alkaline leaching method in the prior art to prepare zinc leaching solution, while leaching zinc ions, is also accompanied by the leaching of other metal impurity ions in the smelting waste residue, such as copper, lead, iron, manganese and other ions. Therefore, for ammonia The zinc leaching solution obtained by the method leaching often requires further purification and impurity removal operations to remove the impurity ions in order to obtain high-purity zinc products. This virtually increases the steps of zinc recovery from smelting waste residues, and affects the industry. application in

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Mix smelting waste residue and calcium hypochlorite, the amount of calcium hypochlorite added is 10% of the mass of smelting waste residue, place in a microwave reactor, heat up to 300°C at a heating rate of 20°C / min, and roast for 20min after taking out;

[0028] (2) Get citric acid and tartaric acid according to molar ratio 1: 1 and mix uniformly to obtain compound mixture, add water until the concentration of citric acid is 1mol / L, add ammoniacal liquor and ammonium sulfate that molar ratio is 1: 1, make the total ammoniacal concentration in the solution 5mol / L, adjust the pH value to 8 to obtain a coordination leaching agent;

[0029] (3) Mix the roasted product of step (1) and the coordination leaching agent of step (2) uniformly at a solid-to-liquid ratio of 10 g / ml, and leaching at room temperature (25° C.) under 1000 W ultrasonic power for 20 minutes to obtain a leaching solution;

[0030] (4) Zinc powder is added to the obtained leaching solution according...

Embodiment 2

[0033] Same as Example 1, the difference is that the amount of calcium hypochlorite added is 20% of the quality of smelting waste residue.

Embodiment 3

[0035] Same as Example 1, the difference is that the added amount of calcium hypochlorite is 3% of the quality of smelting waste residue.

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Abstract

The invention discloses a method for recycling zinc from smelting waste residues. The method comprises the following steps: uniformly mixing the smelting waste residues with calcium hypochlorite, androasting at a high temperature to obtain a roasted product; uniformly mixing one coordination agent in citric acid or citrate with one coordination agent in tartaric acid or tartrate to obtain a coordination mixture, adding water, adding an ammonia water solution and ammonium sulfate after uniformly adding, uniformly mixing to form a coordination leaching agent; putting the obtained roasted product in the coordination leaching agent to subject to ultrasonic reaction to obtain a zinc leaching solution; adding zinc powder into the obtained leaching solution to react for certain time, then, filtering, and performing high-temperature roasting on the obtained filtrate to obtain zinc oxide. While a leaching rate of zinc in the smelting waste residues is guaranteed, impurity irons therein are prevented from leaching out; and the obtained zinc leaching solution can be roasted at a high temperature to directly obtain a high-purity zinc oxide product, so that zinc in the smelting waste residuesis conveniently recycled to apply in the industry.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for recovering zinc from smelting waste residue. Background technique [0002] In addition to zinc mineral resources, zinc-containing slag dust and other metallurgical slag dust are also extremely important available resources in my country, mainly zinc-containing gas mud and gas ash produced in the blast furnace smelting process, zinc-containing smoke dust produced in the electric arc furnace smelting process, and lead smelting. Zinc-containing dust and zinc hydrometallurgy slag after slag volatilization; hydromethod zinc smelting has accounted for more than 80% of the total zinc smelting in the world, and this process produces a large amount of zinc-containing leaching slag. up to 14%), calcium (up to 19%), chlorine (up to 12%), fluorine (up to 2%) and other impurities, zinc is mainly zinc oxide, zinc iron spinel and silicon The iron element mainly exists in the form ...

Claims

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Application Information

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IPC IPC(8): C22B19/30C22B19/20C22B19/34
CPCC22B19/30C22B19/24C22B19/26C22B19/34Y02P10/20
Inventor 马爱元郑雪梅袁杰朱山李松
Owner LIUPANSHUI NORMAL UNIV
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