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Method for performing wet desulfurization and zinc sulfate recycling through cooperation of copper slag tailings and zinc smelting fly ash

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

Active Publication Date: 2019-08-06
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 performing wet desulfurization and zinc sulfate recycling through the cooperation of copper slag tailings and zinc smelting fly ash, and belongs to the technical field of comprehensive utilization of resources. The method mixes copper slag tailings, zinc smelting fly ash and water to prepare into desulfurization pulp; flue gas is in contact reaction with the pulp; the sulfur dioxide in the flue gas is absorbed into the slurry and is catalyzed and oxidized into sulfuric acid by the oxygen and valuable metal ions in the flue gas; the iron, zinc, manganese, aluminum and other elements in the copper slag tailings and the zinc in the zinc smelting fly ash can be further leached out by the sulfuric acid; the reacted pulp can obtain filter residues and filtrate through filtering; the iron can be precipitated by adding alkali into the filtrate; heavy metal arsenic in the filtrate can be removed through the utilization of the flocculation of ferric hydroxide; the cadmium and lead in the filtrate can be displaced by adding zinc dust; and a product zinc sulfate can be finally obtained by introducing the slurry into a zinc sulfate system after flocculation.The method is simple in operation and low in operation cost; the copper slag tailings and the zinc smelting fly ash can be recycled to remove the sulfur dioxide in the flue gas; and the zinc in the desulphurization slurry can be recycled, so that a zinc sulfate by-product can be obtained.

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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IPC IPC(8): B01D53/80B01D53/50B01D53/86C01G9/06
CPCB01D53/50B01D53/80B01D53/8609C01G9/06B01D2258/0283B01D2251/102B01D2251/60B01D2251/608C01P2006/80
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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