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A method for wet desulfurization of copper slag tailings in cooperation with zinc smelting dust removal and recovery of zinc sulfate

A technology of wet desulfurization and zinc smelting, applied in the direction of zinc sulfate, separation methods, chemical instruments and methods, etc., can solve the problems of low product purity, poor economic benefits, complicated process of manganese sulfate products, etc., and achieve enhanced desulfurization effect, The effect of low recycling cost

Active Publication Date: 2021-11-30
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent (CN201710826184.7) proposes a method for compound pulp to absorb sulfur dioxide in flue gas to produce manganese sulfate. The composite absorption pulp of desulfurization agent manganese oxide ore powder and accelerator pyrite powder is used for countercurrent contact reaction in the reactor. , the technological process of its manganese sulfate product is complicated, and the product purity is low, and the economic benefit is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In this example, at 10000 mg / m 3 Sulfur dioxide cylinder gas, nitrogen cylinder gas with a purity of 99.5%, an air pump combined with a mass flow meter to accurately prepare simulated smelting flue gas; the gas flow rate of the mixed gas is 0.6L / min, and the volume fraction contains 19.5% oxygen, SO 2 The concentration is 1716mg / m 3 .

[0034] The specific steps of the method described in this embodiment are as follows:

[0035] (1) Prepare flue gas desulfurization slurry by adding copper slag tailings and zinc smelting dedusting ash to deionized water, wherein the particle size of copper slag tailings and dedusting ash is 200 mesh, copper slag tailings and zinc smelting dedusting ash are added 12.5g, the mass ratio of solid to liquid in the desulfurized pulp is 1:4.

[0036] (2) Add the flue gas desulfurization slurry obtained in step (1) into the bubbling reactor.

[0037] (3) Pass the mixed gas into the bottom of the pulp desulfurization bubbling reactor, and und...

Embodiment 2

[0042] The smelting flue gas in this embodiment is a mixed gas of the flue gas produced in the acid production process of copper smelting and the flue gas collected from the environment, and the flue gas volume of the mixed gas is 100,000 Nm 3 / h, the concentration of sulfur dioxide in the flue gas is 2547 mg / m 3 , the oxygen volume concentration is 19.5%, and the flue gas flow rate is 1.2L / min.

[0043] The specific steps of the method described in this embodiment are as follows:

[0044] (1) The smelting flue gas is pretreated by dedusting and cooling to obtain pretreated flue gas, wherein the temperature of the pretreated flue gas is 25°C.

[0045] (2) Add water to the copper slag tailings and zinc smelting dedusting ash to prepare flue gas desulfurization slurry, wherein the particle size of the copper slag tailings and zinc smelting dedusting ash is 200 mesh, copper slag tailings 100kg, dedusting ash 150kg, desulfurization The mass ratio of solid to liquid in the pulp i...

Embodiment 3

[0051] The smelting flue gas in this embodiment is a mixed gas of the flue gas produced in the acid production process of copper smelting and the flue gas collected from the environment, and the flue gas volume of the mixed gas is 200000Nm 3 / h, the concentration of sulfur dioxide in the flue gas is 1600 mg / m 3 , the oxygen volume concentration is 19.0%, and the flue gas flow rate is 1.8L / min.

[0052] The specific steps of the method described in this embodiment are as follows:

[0053] (1) The smelting flue gas is pretreated by dedusting and cooling to obtain pretreated flue gas. The temperature of the pretreated flue gas is 30°C, and the oxygen volume concentration is 19.0%.

[0054] (2) Add water to copper slag tailings and zinc smelting dust to prepare flue gas desulfurization slurry, the particle size of which is 200 mesh, the solid-liquid mass ratio in the desulfurization slurry is 1:5, copper slag tailings 30kg , dust removal 150kg; the flue gas desulfurization slurr...

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Abstract

The invention discloses a method for wet desulfurization of copper slag tailings in cooperation with zinc smelting dust removal and recovery of zinc sulfate, and belongs to the technical field of comprehensive utilization of resources. The method is to mix copper slag tailings and zinc smelting dedusting ash with water to prepare desulfurized pulp, the flue gas reacts with the pulp in contact, and the sulfur dioxide in the flue gas is absorbed into the slurry and absorbed by the oxygen and valuable metal ions in the flue gas. Catalytic oxidation into sulfuric acid, sulfuric acid further leaching iron, zinc, manganese, aluminum and other elements in copper slag tailings and zinc element in zinc smelting dust removal dust, the reacted pulp is filtered to obtain filter residue and filtrate, and alkali is added to the filtrate to make iron Elements are precipitated, and iron hydroxide flocculation is used to remove heavy metal arsenic in the filtrate, and zinc powder is added to replace cadmium and lead in the filtrate. After flocculation, the slurry is introduced into the zinc sulfate system to finally obtain the product zinc sulfate. The invention is simple in operation and low in operation cost, and can not only remove sulfur dioxide in flue gas by utilizing copper slag tailings and zinc smelting dedusting ash as resources, but also recover zinc element in desulfurization slurry to obtain zinc sulfate by-product.

Description

technical field [0001] The invention relates to a method for wet desulfurization of copper slag tailings in cooperation with zinc smelting dust removal ash and recovery of zinc sulfate, which belongs to the technical field of comprehensive utilization of resources and the technical field of industrial waste gas purification. [0002] technical background [0003] Copper slag tailings are industrial solid wastes finally produced after flotation of converter blowing slag in the process of copper smelting. They have the characteristics of large quantity, fine particle size, various types, and complex components. These slags contain valuable metal elements such as iron, zinc, calcium, magnesium, manganese, aluminum and a small amount of precious metals such as gold and silver. The main component of copper slag tailings is fayalite (Fe 2 SiO 4 ), mafic olivine (MgFeSiO 4 ), magnetite (Fe 3 o 4 ) exists in the form of vitreous body, in which the aluminum mainly exists in the f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/80B01D53/50B01D53/86C01G9/06
CPCB01D53/50B01D53/80B01D53/8609B01D2251/102B01D2251/60B01D2251/608B01D2258/0283C01G9/06C01P2006/80
Inventor 王学谦范未军宁平李子燕王郎郎陶雷
Owner KUNMING UNIV OF SCI & TECH
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