Method for recovering valuable components from zinc smelting slag

A technology of zinc smelting slag and zinc smelting, which is applied in the field of recycling valuable components from zinc smelting slag, and can solve problems such as environmental pollution, high energy consumption, and failure to consider recycling

Inactive Publication Date: 2018-02-09
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, zinc smelting slag is processed and recovered by volatilization kiln, fuming furnace, blast furnace, vortex smelting and other processes. Only part of the lead, zinc, silver and other components are recovered, and the recovery of valuable components such as copper, iron and gold is not considered. And high energy consumption, large pollution
[0003] At present, a large amount of zinc smelting slag is accumulated, and zinc smelting slag contains a large amount of heavy metal ions, which not only brings serious environmental pollution, but also causes waste of resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0222] A method for recovering valuable components from zinc smelting slag, comprising the following steps:

[0223] Step 1, slag mixing:

[0224] Add cold zinc smelting slag (zinc leaching slag and volatilized kiln slag) into DC electric arc furnace, and add lime and SiO 2 , MgO, Al 2 o 3, forming a mixed slag; heating the mixed slag to a molten state to form a copper-containing reaction slag, and allowing the reaction slag to achieve natural mixing; real-time monitoring of the reaction slag to ensure both (a) and (b) parameters to obtain the slag after the reaction is completed;

[0225] Corresponding to (a): The temperature of the copper-containing reaction slag is 1660°C. Use a refractory spray gun to insert into the reaction slag, use nitrogen as the loading gas, and spray copper slag, copper-containing soot, and miscellaneous copper with a particle size of ≤150 μm at room temperature. And copper-containing waste and copper-containing circuit boards, at the same time ...

Embodiment 2

[0235] A method for recovering valuable components from zinc smelting slag, comprising the following steps:

[0236] Step 1, slag mixing:

[0237] Add cold zinc smelting slag (zinc leaching slag) to pourable smelting reaction slag tank, add limestone, dolomite, red mud and FeO and Fe at the same time 2 o 3 , forming mixed slag; using oxygen-enriched air with a preheating temperature of 800°C, injecting natural gas, anthracite with a particle size of 20mm, and coke particles, heating the mixed slag to a molten state to form a copper-containing reaction slag; real-time monitoring of reaction melting Slag, through the regulation and control to ensure the two parameters (a) and (b) at the same time, to obtain the slag after the reaction is completed;

[0238] Corresponding to (a) the temperature of the copper-containing reaction slag is 1520°C, use a refractory spray gun to insert into the reaction slag, use argon as the carrier gas, and spray copper slag, copper-containing soot...

Embodiment 3

[0256] A method for recovering valuable components from zinc smelting slag, comprising the following steps:

[0257] Step 1, slag mixing:

[0258] Put the zinc smelting slag (the volatilized kiln slag obtained from the discharge port of the volatilization kiln) into the DC electric arc furnace, and at the same time add limestone and high-calcium red mud after desodination to form a mixed slag; Blow anthracite, coke particles and coal powder with a particle size of 20mm, heat the mixed slag to a molten state, form a copper-containing reaction slag, and mix it mechanically; monitor the reaction slag in real time, and ensure both (a) and (b) through regulation and control parameters to obtain the slag after the reaction is completed;

[0259] Corresponding to (a): The temperature of the copper-containing reaction slag is 1685°C. Add acid metallized pellets, copper smelting slag and copper-containing blowing slag to the reaction slag, and simultaneously add copper-containing soot...

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Abstract

The invention discloses a method for recovering valuable components from zinc smelting slag. The method comprises the following steps that S1, the zinc smelting slag is added to a heat insulating device or a smelting reaction device in which slag can flow out, calcium-based minerals and additives are added, and mixed slag is formed; the mixed slag is heated to a molten state, reaction slag is formed, the reaction slag is monitored in real time, and by regulating and controlling the temperature of the reaction slag and the specific value of alkalinity CaO/SiO2, the slag obtained after a reaction is completed is obtained; and S2, the obtained slag is subjected to sedimentation separation, smoke dust containing a ferrous silicate mineral phase, a copper-rich phase and an iron-rich phase and smoke dust containing zinc, lead, bismuth and indium are obtained, and gold and silver components are migrated and enriched and enter the copper-rich phase; and all the phases are recovered. By the adoption of the method, the copper-containing slag (copper-containing slag smaller than 0.1wt%) can be lowered, besides efficient recovery of the components of copper, iron, gold, silver, lead, zinc, indium, bismuth, sodium, potassium and the like can be achieved, low-copper materials containing iron are obtained, the metal recovery rate is high, the production cost is low, environmental friendlinessis achieved, and the economic returns are high.

Description

technical field [0001] The invention belongs to the technical field of resource comprehensive utilization and slag metallurgy, and specifically relates to a method for recovering valuable components from zinc smelting slag. Background technique [0002] The zinc smelting process includes two processes of hydrometallurgy and vertical tank zinc smelting. The two processes produce a large amount of zinc smelting slag, of which zinc leaching slag, jarosite slag, pickling jarosite slag, and goethite are produced by the two processes. Slag, hematite slag, etc., vertical tank zinc smelting produces vertical tank zinc smelting furnace slag. Zinc smelting slag contains secondary resources such as copper, iron, zinc, lead, indium, gold, and silver, among which the iron content is as high as 50%, far exceeding the mineable grade of iron ore (minable grade, iron content> 26wt%), The copper content is as high as 2%, far exceeding the mineable grade of copper ore (minable grade, coppe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B19/30C22B13/02C22B11/02C22B58/00C22B30/06
CPCC22B7/001C22B7/04C22B11/023C22B13/025C22B19/30C22B30/06C22B58/00Y02P10/20
Inventor 张力张武
Owner NORTHEASTERN UNIV
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