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Energy saving and emission reducing whole wet method zinc smelting technique method

A technology of energy saving, emission reduction and process method, which is applied in the direction of photography process, photography auxiliary process, and process efficiency improvement, etc., can solve the problems of difficulty in processing zinc smelting slag, low recovery rate of associated metals, etc., and saves reagent costs and energy consumption. , the effect of easy industrial production and efficient extraction

Inactive Publication Date: 2018-10-09
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a clean and environmentally friendly, simple process, high recovery rate of associated metals, which can realize no Zinc hydrometallurgy process for slag zinc smelting

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The main composition of the zinc concentrate used is by mass percentage: Zn 36.8%, Pb 10.1%, Cu 7.4%, Cd 0.17%, Co 1.5%, In 0.034%, Ag 1520g / t, of which the particle size is -68um accounting for the zinc concentrate 78%.

[0017] (1) Potential-controlled leaching: the zinc concentrate is slurried at a liquid-solid ratio of 5:1 and then added to the reactor, and chlorine gas is introduced for leaching, and 60L of chlorine gas is injected per ton of ore per hour. The leaching conditions are: concentration of hydrochloric acid The leaching rate is 1mol / L, the leaching temperature is 60°C, and the leaching rates of each metal after 4 hours of reaction are: 98.23%, 98.01%, 97.21%, 95.25%, 96.67%, 97.14%, 97.98%.

[0018] (2) Solution purification: add calcium hydroxide to the solution obtained in step (1) to adjust the pH to 5.0 to remove iron, add zinc powder to the filtered solution, and replace it successively to obtain metal lead, cadmium, copper, cobalt, and silver. Th...

Embodiment 2

[0021] (1) Potential-controlled leaching: the zinc concentrate is mixed according to the liquid-solid ratio of 3:1 and then added to the reactor, and chlorine gas is introduced for leaching, and 80L of chlorine gas is injected per ton of ore per hour. The leaching conditions are: hydrochloric acid The concentration is 1mol / L, the leaching temperature is 50°C, and the leaching rates of each metal after 5 hours of reaction are: 99.01%, 98.56%, 97.23%, 96.36%, 97.09%, 98.76%, 98.12%.

[0022] (2) Solution purification: add calcium oxide to the solution obtained in step (1) to adjust the pH to 4.8 for iron removal, add zinc powder to the solution obtained after filtration, and replace successively to obtain metal lead, cadmium, copper, cobalt, and silver, and the direct yields are respectively 97.21%, 95.65%, 94.37%, 96.19%, 93.14%.

[0023] (3) Closed electrodeposition: the purification solution obtained in step (2) is 390A / m at a current density 2 , the temperature is 37 DEG C ...

Embodiment 3

[0025] (1) Potential-controlled leaching: the zinc concentrate is slurried at a liquid-solid ratio of 6:1 and then added to the reactor, and chlorine gas is introduced to react, and 70L of chlorine gas is injected per ton of ore per hour. The leaching conditions are: concentration of hydrochloric acid The leaching rate is 1mol / L, the leaching temperature is 70°C, and the leaching rates of each metal after 5 hours of reaction are: 98.34%, 97.62%, 98.13%, 96.98%, 97.54%, 97.09%, 97.65%.

[0026] (2) Solution purification: add sodium hydroxide to the solution obtained in step (1) to adjust the pH to 5.0 to remove iron, add zinc powder to the filtered solution, and replace it successively to obtain metal lead, cadmium, copper, cobalt, and silver. They were 97.09%, 96.23%, 93.45%, 96.11%, and 94.23%, respectively.

[0027] (3) Closed electrodeposition: the purification solution obtained in step (2) is 450A / m at a current density 2 , the temperature is 45 DEG C under the condition ...

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PUM

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Abstract

The invention discloses an energy saving and emission reducing whole wet method zinc smelting technique method and belongs to the field of non-ferrous metal metallurgy. The smelting technique method comprises the following steps: adding ground and screened zinc concentrate into a leaching tank according to a certain liquid-solid ratio, introducing chlorine to control electric potential of slurry,making valuable metal of zinc, lead, silver, copper, indium, cobalt, cadmium and the like enter a solution in an ionic form and making iron and sulfur enter leaching residues; extracting to recycle elemental sulfur in the leaching residues; adjusting pH of leachate and purifying to remove the iron; adding zinc powder into obtained purified liquid to perform replacement step by step to respectivelyobtain metal lead, silver, copper, cobalt and cadmium; then obtaining cathode zinc through airtight electrodeposition and returning chlorine generated by a positive electrode to a leaching work procedure. By means of the method, all valuable elements in the zinc concentrate can be efficiently and comprehensively recycled; the method has the advantages of simpleness in operation, convenience in control and easiness in industrial production.

Description

technical field [0001] The invention belongs to the field of nonferrous metal smelting and relates to a zinc hydrometallurgy process. Background technique [0002] Zinc smelting processes mainly include fire method and wet method. Fire method zinc smelting includes vertical tank smelting, closed blast furnace zinc smelting and electrothermal zinc smelting. Among them, the vertical tank zinc smelting has been eliminated, the electric furnace zinc smelting has not seen new development due to the low production capacity, and the blast furnace zinc smelting is the only pyromelting method that still has certain vitality. However, due to the difficulty in solving environmental problems such as the flue gas and dust pollution caused by the sintering process of lead-zinc concentrate, this method has already been set in the sunset. [0003] In contrast, hydrometallurgy zinc technology has developed rapidly, and its output has exceeded 80% of the world's zinc metal, mainly including ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C1/16C22B3/10C22B19/20
CPCC22B3/045C22B3/10C22B19/22C25C1/16Y02P10/20
Inventor 张文娟王成彦张家靓马保中陈永强
Owner UNIV OF SCI & TECH BEIJING