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A method for separating zinc from zinc-containing dust sludge in an iron and steel plant

A technology for iron and steel plants and dust sludge, which is applied in the field of zinc-containing dust and sludge separation in iron and steel plants, can solve the problems of harsh operating environment, large ammonia loss, and serious ammonia volatilization, and achieve good operating environment, efficient separation, and reduced zinc content Effect

Active Publication Date: 2019-09-27
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For the wet treatment process of zinc-containing dust sludge in iron and steel plants, ammonia water or one of them can be used as a leaching agent, but ammonia water or a leaching agent composed of ammonia water still has serious ammonia volatilization during the leaching process, and the operating environment is harsh. Ammonia volatilization leads to a large amount of ammonia loss and high operating costs, which makes many companies reluctant to use ammonia leaching technology

Method used

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  • A method for separating zinc from zinc-containing dust sludge in an iron and steel plant

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Effect test

Embodiment 1

[0025] The method for separating zinc from zinc-containing dust and sludge in the iron and steel plant, the concrete steps are as follows:

[0026] Step 1, prepare 4000mL ammonium carbonate and ammonium bicarbonate mixed solution, control the molar ratio of ammonium carbonate and ammonium bicarbonate in the mixed solution to be 1:1, and the total ammonia concentration is 4mol / L

[0027] Step 2, the blast furnace gas ash (the phase of zinc in the blast furnace gas ash includes metal zinc, ZnO, ZnS, ZnFe 2 o 4 and Zn 2 SiO 4 , the mass percent of the main chemical components are: Zn3.5%, Fe38.2%, C17.3%, CaO2.1%, SiO 2 3.5%) according to the solid-to-liquid ratio of 1:4g / mL, add the mixed solution of ammonium carbonate and ammonium bicarbonate in step 1, mix evenly and add it to the high-pressure reactor, and feed compressed air into the high-pressure reactor to maintain the pressure in the reactor. 2.0MPa, heat up, control the reaction temperature to 120°C, and the leaching...

Embodiment 2

[0030] The method for separating zinc from zinc-containing dust and sludge in the iron and steel plant, the concrete steps are as follows:

[0031] Step 1, prepare 8000mL of ammonium carbonate and ammonium bicarbonate mixed solution, control the molar ratio of ammonium carbonate and ammonium bicarbonate in the mixed solution to be 2:1, and the total ammonia concentration is 6mol / L

[0032] Step 2, blast furnace gas mud (the phase of zinc in blast furnace gas mud includes metal zinc, ZnO, ZnS, ZnFe 2 o 4and Zn 2 SiO 4 , the mass percentage of the main chemical composition is: Zn10.2%, Fe36.5%, C19.1%, CaO1.9%, SiO 2 2.7%) according to the solid-to-liquid ratio of 1:8g / mL, add the mixed solution of ammonium carbonate and ammonium bicarbonate in step 1, mix evenly and add to the autoclave, and feed compressed air into the autoclave to maintain the pressure in the autoclave. 0.5MPa, heat up, control the reaction temperature to 80°C, and the leaching reaction time is 180min. Af...

Embodiment 3

[0035] The method for separating zinc from zinc-containing dust and sludge in the iron and steel plant, the concrete steps are as follows:

[0036] Step 1, prepare 15000mL of ammonium carbonate and ammonium bicarbonate mixed solution, control the molar ratio of ammonium carbonate and ammonium bicarbonate in the mixed solution to be 4:1, and the total ammonia concentration is 10mol / L

[0037] Step 2, dry blast furnace dedusting (the phase of zinc in the blast furnace dry dedusting ash includes metal zinc, ZnO, ZnS, ZnFe 2 o 4 and Zn 2 SiO 4 , the mass percentage of the main chemical composition is: Zn12.5%, Fe30.2%, C18.5%, CaO 4.3%, SiO 2 7.5%) according to the solid-to-liquid ratio of 1:20g / mL, add the mixed solution of ammonium carbonate and ammonium bicarbonate in step 1, mix evenly and add it to the high-pressure reactor, and feed compressed air into the high-pressure reactor to maintain the pressure in the reactor. 0.12MPa, heat up, control the reaction temperature to...

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Abstract

The invention relates to a method for separating zinc from zinc-containing dust and sludge of an iron and steel plant, and belongs to the field of disposal of solid wastes. The method comprises usingammonium carbonate and ammonium bicarbonate to prepare a mixed solution, adding the mixed solution into the zinc-containing dust and sludge of the iron and steel plant, introducing compressed air to enable the reaction pressure to reach 0.12 MPa to 2.0 MPa, leaching for 60-240 minutes at the temperature of 30 DEG C to 120 DEG C, separating the solid and the liquid to obtain a zinc leaching liquidand a leaching residue comprising iron, carbon and calcium. The mixed solution comprising the ammonium carbonate and the ammonium bicarbonate is used as a leaching agent, the compressed air is introduced to main certain pressure, the zinc in the material is transformed into a soluble compound, the soluble compound enters the solution, but the elements of iron, carbon and calcium are not dissolved;meanwhile, the oxygen in the air is used as an oxidizing agent to accelerate the dissolution of the zinc under the pressurizing condition, so that the zinc is separated from the elements of iron, carbon and calcium in the zinc-containing dust and sludge of the iron and steel plant.

Description

technical field [0001] The invention relates to a method for separating zinc from zinc-containing dust and mud in iron and steel plants, and belongs to the technical field of environmental protection. Background technique [0002] Zinc is a trace harmful element in the blast furnace charge of iron and steel plants, usually in the form of oxides or sulfides. Zinc compounds are easily reduced in the blast furnace, and are reduced to zinc vapor by carbon monoxide at a high temperature of more than 1000 °C. Zinc vapor rises with the blast furnace gas. Part of the zinc vapor is oxidized and deposited in the low-temperature zone on the upper part of the blast furnace, and then descends together with the furnace charge. This cycle of zinc accumulation in the furnace is formed, which is called the "small cycle" of zinc in the blast furnace. However, most of the zinc vapor enters the gas dedusting system along with the gas, and most of the zinc enters the sludge of wet dedusting or...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/02C22B19/20
CPCC22B7/008C22B7/02C22B19/24Y02P10/20
Inventor 李兴彬魏昶邓志敢罗兴国庄子宇李旻廷李存兄
Owner KUNMING UNIV OF SCI & TECH
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