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Method for recycling low-zinc flue dust from iron and steel plant

A steel plant and resource-based technology, applied in chemical instruments and methods, improvement of process efficiency, photographic process, etc., can solve the problems of low recovery rate of low-zinc smoke and dust, large pollution, etc., achieve good economic benefits, less equipment investment, The effect of reducing pollution

Inactive Publication Date: 2020-04-10
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims at the problems of low recovery rate of low-zinc dust in iron and steel plants and heavy pollution in the prior art, and provides a method for resource utilization of low-zinc dust in iron and steel plants. The method of the invention comprehensively recovers the main valence components, realizing the low cost, low energy consumption, low pollution and high efficiency of the low zinc fume treatment process

Method used

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  • Method for recycling low-zinc flue dust from iron and steel plant
  • Method for recycling low-zinc flue dust from iron and steel plant
  • Method for recycling low-zinc flue dust from iron and steel plant

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: In this embodiment, a low-zinc fume from a steel plant in Sichuan is selected. The Zn content in the low-zinc fume is 5.23%, the TFe content is 45.69%, and the C content is 14.24% (see Table 1);

[0021] Table 1 Analysis of main components of low-zinc fumes from a steel plant in Sichuan

[0022]

[0023] A method for resource utilization of low-zinc smoke dust in iron and steel plants (see figure 1 ),Specific steps are as follows:

[0024] (1) Iron concentrate and zinc-rich materials are obtained by conventional gravity separation of low-zinc dust from iron and steel plants. Zn13.5% and Fe25.8% in zinc-rich materials, 52.6% Fe and Zn1.8% in iron concentrate, iron concentrate Mine returns to steel process;

[0025] (2) Put the zinc-rich material in step (1) into the leaching tank, and carry out leaching with a dilute sulfuric acid solution at a temperature of 50°C and a stirring rate of 200r / min, wherein the mass concentration of the dilute sulfuric ac...

Embodiment 2

[0027] Embodiment 2: this embodiment selects the low-zinc soot of a certain iron and steel plant in Yunnan, and the Zn content is 4.89%, the TFe content is 48.26%, and the C content is 17.97% (see Table 2) in the low-zinc soot;

[0028] Table 2 Analysis of main components of low-zinc fumes from a steel plant in Yunnan

[0029]

[0030] A method for resource utilization of low-zinc smoke dust in iron and steel plants (see figure 1 ),Specific steps are as follows:

[0031] (1) Iron concentrate and zinc-rich materials are obtained by conventional gravity separation of low-zinc dust from iron and steel plants. Zn12.1% and Fe28.3% in zinc-rich materials, 50.9% Fe and Zn1.4% in iron concentrate, iron concentrate Mine returns to steel process;

[0032] (2) Put the zinc-rich material in step (1) into the leaching tank, and carry out dilute sulfuric acid solution leaching at a temperature of 55°C and a stirring rate of 200r / min, wherein the mass concentration of the dilute sulfuri...

Embodiment 3

[0034] Embodiment 3: the low-zinc soot of a steel factory in Guizhou in this embodiment, the Zn content is 6.23%, the TFe content is 47.87%, and the C content is 21.39% (see Table 3) in the low-zinc fume;

[0035] Table 3 Analysis of main components of low-zinc fumes from a steel plant in Guizhou

[0036]

[0037] A method for resource utilization of low-zinc smoke dust in iron and steel plants (see figure 1 ),Specific steps are as follows:

[0038](1) Iron concentrate and zinc-rich materials are obtained by conventional gravity separation of low-zinc dust from iron and steel plants. Zn11.5% and Fe23.2% in zinc-rich materials, 55% Fe and Zn1.1% in iron concentrate, iron concentrate Mine returns to steel process;

[0039] (2) Put the zinc-rich material in step (1) into the leaching tank, and carry out leaching with a dilute sulfuric acid solution at a temperature of 45°C and a stirring rate of 200r / min, wherein the mass concentration of the dilute sulfuric acid solution is...

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Abstract

The invention relates to a method for recycling low-zinc flue dust from an iron and steel plant, and belongs to the technical field of comprehensive utilization of metallurgical resources. The low-zinc flue dust from the iron and steel plant is subjected to gravity concentration to obtain an iron ore concentrate and a zinc-rich material, and the iron ore concentrate returns to a steel process; under the condition of stirring, the zinc-rich material is leached with a dilute sulfuric acid solution at the temperature of 40-60 DEG C, and a leachate and leach residues are obtained through liquid-solid separation; the leachate is subjected to oxidative neutralization for iron precipitation to obtain iron residues and purged liquor, the purged liquor is subjected to electrodeposition to obtain electric zinc and a waste electrolyte, and the waste electrolyte returns for leaching of a zinc-rich material; the leached residues and the iron residues are evenly mixed and subjected to magnetizing roasting to obtain a roasted product, the roasted product is subjected to magnetic separating to obtain an iron ore concentrate and tailings, the iron ore concentrate returns to the steel process, and the tailings are used as a building material. By means of the method, the valuable constituents of zinc, iron and carbon in the low-zinc flue dust are effectively recycled, and the electric zinc and the iron concentrate are obtained.

Description

technical field [0001] The invention relates to a method for resource utilization of low-zinc smoke dust in iron and steel plants, and belongs to the technical field of comprehensive utilization of metallurgical resources. Background technique [0002] Zinc is an important industrial raw material, widely used in aerospace, automobile, shipbuilding, steel, machinery, construction, electronics and other industries. Zinc has good corrosion resistance, is very stable in dry air or oxygen, and forms basic zinc carbonate (ZnCO 3 ·3Zn(OH) 2 ), which can further protect zinc to avoid further corrosion. Zinc is mainly used for galvanizing, accounting for more than 40% of zinc consumption; secondly, zinc is also used to make brass, accounting for about 20% of total zinc consumption; The rest is used in the manufacture of zinc-based alloys, dry batteries, hardware supplies, etc. Iron concentrate is the raw material for blast furnace ironmaking, coke is an important industrial raw ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/02C22B19/20C22B19/30C25C1/16C22B1/02B03C1/02
CPCC22B7/02C22B7/001C22B7/007C22B7/006C22B19/22C22B19/20C22B19/30C25C1/16C22B1/02B03C1/02Y02P10/20
Inventor 王华李博胡建杭魏永刚郭吉浩
Owner KUNMING UNIV OF SCI & TECH
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