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Process for recovering fluorine and zinc from steelmaking soot

A soot and process technology, which is applied in the field of comprehensive recovery of metallurgical waste residues, can solve the problems of limited use range of defluorination agents, low fluorine removal efficiency, and difficulty in wide-scale popularization and application, and achieves clean production requirements and solves technical problems. Effect

Active Publication Date: 2017-06-16
NORTHWEST RES INST OF MINING & METALLURGY INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But on the other hand, fluorine in steelmaking soot can seriously damage zinc smelting production systems
[0003] At present, there are several treatment methods for removing harmful element fluorine: 1. Use defluorinating agent to defluorinate, this process is simple, but the application range of defluorinating agent is limited; The removal efficiency is low and the cost is high; 3. Using calcium salt and magnesium salt wet defluorination, the process is simple, but calcium and magnesium ions have an impact on zinc smelting
All of the above methods have disadvantages such as low defluorination efficiency and limited application range, so it is difficult to popularize and apply them on a large scale.

Method used

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  • Process for recovering fluorine and zinc from steelmaking soot
  • Process for recovering fluorine and zinc from steelmaking soot

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The process for recovering fluorine and zinc from steelmaking soot comprises the following steps:

[0025] (1) One-stage leaching: Slurry the steelmaking soot with water and add it to the one-stage leaching tank, detect the concentration of fluoride ions in the steelmaking soot, calculate the amount of its substance, add manganese dioxide, sodium sulfite and one-stage leaching agent, manganese dioxide The molar ratio of fluoride ion is 0.6:1, the amount of sodium sulfite and manganese dioxide is the same, then add concentrated sulfuric acid to an initial concentration of 180g / L, control the liquid-solid weight ratio to 4:1, temperature 60°C, leaching time 60 minutes , carry out the leaching reaction, obtain a section of leachate and a section of leaching residue after filtration;

[0026] (2) Second-stage leaching: Slurry the first-stage leaching residue with water and add it to the second-stage leaching tank, control the liquid-solid ratio to 3:1, add concentrated sulf...

Embodiment 2

[0030] The process for recovering fluorine and zinc from steelmaking soot comprises the following steps:

[0031] (1) One-stage leaching: the specific operating parameters are as follows:

[0032] The molar ratio of manganese dioxide to fluoride ion is 1:1, and the ratio of sodium sulfite to manganese dioxide is

[0033] the same amount,

[0034] Add concentrated sulfuric acid to an initial concentration of 180g / L;

[0035] Control the liquid-solid weight ratio to 3:1;

[0036] The leaching temperature is 60°C;

[0037] The leaching time was 60 minutes, and all the other steps were the same as in Example 1.

[0038] (2) Two-stage leaching: the specific operating parameters are as follows:

[0039] The liquid-solid ratio is 2:1;

[0040] Add concentrated sulfuric acid to an initial mass concentration of 250g / L;

[0041] The leaching temperature is 80°C;

[0042] The leaching time was 90 minutes, and all the other steps were the same as in Example 1.

[0043] And the se...

Embodiment 3

[0050] The process for recovering fluorine and zinc from steelmaking soot comprises the following steps:

[0051] (1) One-stage leaching: the specific operating parameters are as follows:

[0052] The molar ratio of manganese dioxide to fluoride ion is 0.7:1, and the amount of sodium sulfite and manganese dioxide is the same.

[0053] Add concentrated sulfuric acid to an initial concentration of 180g / L;

[0054] Control the liquid-solid weight ratio to 4:1;

[0055] The leaching temperature is 50°C;

[0056] The leaching time was 40 minutes, and all the other steps were the same as in Example 1.

[0057] (2) Two-stage leaching: the specific operating parameters are as follows:

[0058] The liquid-solid ratio is 3:1;

[0059] Add concentrated sulfuric acid to an initial mass concentration of 250g / L;

[0060] The leaching temperature is 70°C;

[0061] The leaching time was 60 minutes, and all the other steps were the same as in Example 1.

[0062] And the second-stage leac...

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Abstract

The invention relates to a technology capable of recycling fluorine and zinc from steelmaking soot. Two-segment acid leaching is adopted for enabling zinc, fluorine and iron in the steelmaking soot to be dissolved in a solution, and then a precipitation method is adopted for enabling harmful element fluorine in the solution to be separated from the solution; and defluorination filtering liquid enters a zinc smelting system, and according to the normal technology, electrolytic zinc is produced. Fluorine-contained precipitation is washed, filtered and dried, and then a fluoride product is obtained. after the technological treatment is carried out, the zinc in the steelmaking soot can be recycled in a manner of a product of excellent cathode zinc, the harmful element fluorine is comprehensively utilized in a manner of an auxiliary product, and the environment pollution caused in the long-term stacking and storing or take-out transportation process of the soot in the steelmaking industry can be eliminated.

Description

technical field [0001] The invention relates to the technical field of comprehensive recovery of metallurgical waste slag, in particular to a process for recovering fluorine while recovering zinc from steelmaking soot. Background technique [0002] The flue gas generated during the sintering process of iron concentrates in the sintering furnace is recovered by the dust collection system to obtain steelmaking soot. The main composition of steelmaking soot is by weight: 40-50% zinc metal, 0.5-1% fluorine, 5-8% iron, and 3-6% lead. Steelmaking soot has a high zinc content and is a high-value non-ferrous metal secondary raw material. But on the other hand, fluorine in steelmaking soot can seriously damage the zinc smelting production system. [0003] At present, there are several treatment methods for removing harmful element fluorine: 1. Use defluorinating agent to defluorinate, this process is simple, but the application range of defluorinating agent is limited; The removal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/02C22B19/30C01G49/10C01G45/06
CPCY02P10/20
Inventor 马琳亭邵传兵程亮张恩玉李俞良易超鲁兴武
Owner NORTHWEST RES INST OF MINING & METALLURGY INST
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