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A method for comprehensive recovery of zinc, iron and carbon in blast furnace gas mud

A technology for blast furnace gas sludge and iron slag, which is applied to the preparation/purification of carbon, the improvement of process efficiency, and the photographic process, etc. Economic benefits, efficient utilization, and pollution avoidance

Active Publication Date: 2018-08-10
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problems to be solved by the present invention are: low recovery rate of blast furnace gas mud metal, high energy consumption, heavy pollution, etc.

Method used

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  • A method for comprehensive recovery of zinc, iron and carbon in blast furnace gas mud

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In this example, a blast furnace gas mud from a steel plant in Sichuan is selected. The content of Zn in the gas mud is 9.13%, the content of TFe is 25.21%, and the content of C is 24.34%.

[0023] Table 1 Composition analysis of blast furnace gas sludge in a steel plant in Sichuan

[0024] .

[0025] The method for the comprehensive recovery of blast furnace gas sludge zinc, iron and carbon described in this embodiment specifically includes the following steps:

[0026] (1) First put the blast furnace gas mud into an electric blast drying oven to dry for 24 hours, then crush it, grind it with a mill for 10 minutes, and sieve to obtain 200-mesh blast furnace gas mud.

[0027] (2) Put the blast furnace gas marl obtained in step (1) into a beaker and put it into a constant temperature water bath. It is leached with 16% sulfuric acid solution, and filtered to obtain the filter residue and filtrate.

[0028] (3) Pour the filtrate obtained from step (2) into a beaker an...

Embodiment 2

[0036] Blast furnace gas mud from a steel plant in Yunnan was selected. The content of Zn in the blast furnace gas mud was 19.17%, the content of total iron was 22.98%, and the content of C was 15.29%.

[0037] Table 2 Composition analysis of blast furnace gas sludge in a steel plant in Yunnan

[0038] .

[0039] The method for the comprehensive recovery of blast furnace gas sludge zinc, iron and carbon described in this embodiment specifically includes the following steps:

[0040] (1) First put the blast furnace gas mud into an electric blast drying oven to dry for 48 hours, then crush it, grind it with a mill for 12 minutes, and sieve to obtain 200-mesh blast furnace gas mud powder.

[0041] (2) Put the blast furnace gas mud powder obtained in step (1) into a beaker and put it into a constant temperature water bath. It is leached with 20% sulfuric acid solution, and filtered to obtain the filter residue and filtrate.

[0042] (3) Pour the filtrate obtained from step (2...

Embodiment 3

[0050] Blast furnace gas mud from another iron and steel plant in Yunnan was selected. The content of Zn in the blast furnace gas mud was 13.44%, the content of total iron was 21.18%, and the content of C was 17.62%.

[0051] Table 3 Composition analysis of blast furnace gas sludge in a steel plant in Yunnan

[0052] .

[0053] The method for the comprehensive recovery of blast furnace gas sludge zinc, iron and carbon described in this embodiment specifically includes the following steps:

[0054] (1) First put the blast furnace gas mud into an electric blast drying oven to dry for 40 hours, then crush it, grind it with a mill for 15 minutes, and sieve to obtain 200-mesh blast furnace gas mud powder.

[0055] (2) Put the blast furnace gas mud powder obtained in step (1) into a beaker and put it into a constant temperature water bath. It is leached with 18% sulfuric acid solution, and filtered to obtain the filter residue and filtrate.

[0056] (3) Pour the filtrate obtain...

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Abstract

The invention relates to a method for comprehensively recovering zinc, iron and carbon in blast furnace gas slime and belongs to the field of comprehensive utilization of secondary metallurgy resources. The method comprises the steps that the blast furnace gas slime is dried, crushed and fine ground, blast furnace gas slime powder is obtained and leached with a sulfuric acid solution, filter residues and filtrate are obtained through filtering, oxidization and neutralization are carried out on the filtrate for iron precipitation, iron residues and deironed liquid are obtained through filtering, the deironed liquid is extracted in an extraction device, and then reextraction is carried out; and electrodeposition is carried out on a zinc sulfate solution subjected to reextraction, and electric zinc is obtained. Besides, the filter residues obtained through leaching and the iron residues obtained through deironing are mixed evenly, iron concentrate powder is obtained through wet grinding and magnetic separation after magnetizing roasting under controlled proper conditions, flotation is carried out on tailings subjected to magnetic separation, and carbon in the tailings is recovered. According to the method, basically no pollutant is generated, the sulfuric acid solution and an extraction agent can be recycled, the problems of stacking of the blast furnace gas slime and heavy metal pollution are solved, environmental protection is facilitated, comprehensive utilization of resources is achieved, and the method meets the strategy of sustainable development.

Description

technical field [0001] The invention relates to a method for comprehensive recovery of blast furnace gas sludge, zinc, iron and carbon, and belongs to the field of comprehensive utilization of metallurgical resources. Background technique [0002] Zinc is an important industrial raw material. Metal zinc has good corrosion resistance, so the largest use of metal zinc is galvanizing, which accounts for about 50% of the total zinc consumption; the second is used to manufacture various grades of brass, accounting for about 20%. %; about 15% of the die-casting zinc station; the remaining 20%~25% are mainly used in the manufacture of various zinc-based alloys, dry batteries, zinc oxide, architectural hardware products and chemicals, etc. The average content of zinc in the earth's crust is 0.005%. According to statistics, at the end of 2015, the global zinc reserves were 200 million tons, the global zinc production was 14 million tons, and China's zinc production was 6.15 million ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/02C22B19/30C25C1/16C22B1/02C01B32/05
CPCC22B1/02C22B7/007C22B7/02C22B19/30C25C1/16Y02P10/20
Inventor 李博尹云贵魏永刚王华
Owner KUNMING UNIV OF SCI & TECH
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