A method for treating zinc smoke

A treatment method and technology for soot, applied in the direction of improving process efficiency, etc., can solve problems such as accumulation of Zn, nodules on the upper part of the furnace body, blockage of gas riser pipes and dust removal bags, etc.

Inactive Publication Date: 2009-08-26
史汉祥
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  • Abstract
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  • Claims
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Problems solved by technology

However, simply returning the blast furnace dust to the sintering machine for recycling without any treatment will cause the accumulation of Zn. After the enriched Zn enters the blast furnace, it will cause the tuyere of the blast furnace to rise, the upper part of the furnace body will nodulate, and the gas riser pipe and dust removal Clogging of cloth bags, degradation of coke pyrometallurgical properties (thermal reactivity and post-reaction strength) and other problems affect the normal transportation of the blast furnace system and reduce the service life of the blast furnace
Moreover, the valuable Zn cannot be recycled, resulting in losses

Method used

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  • A method for treating zinc smoke

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Embodiment Construction

[0014] see figure 1 , for zinc-containing blast furnace dust and electric furnace dust produced in the process of iron and steel smelting, using the amphoteric characteristics of Zn to show acidity when it meets strong alkali and alkali when meeting strong acid, Fe and its oxides and C are not dissolved by strong alkali, so use strong alkali NaOH solution is used to treat blast furnace and electric dust, so that Zn, ZnO and NaOH react to form soluble compounds and enter the liquid phase, while Fe and its oxides, C, SiO, Al 2 o 3 , CaO, etc. do not react with NaOH and remain in the solid phase. Then, it was filtered and washed to separate the solid from the liquid. Solid phase filter cake contains Fe and its oxides, C, SiO, Al 2 o 3 , CaO, etc., return to the sintering machine for reuse. Soluble compounds containing Zn in the liquid phase, with H 2 SO 4 Neutralization, Zn is converted to Zn(OH) 2 Precipitate, then filter and wash, the filter cake is Zn(OH) 2 Used to pr...

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Abstract

The invention provides a method for treating zinc blast furnace smoke and electric furnace smoke, comprising: treating the zinc smoke by strongly basic NaOH solution to react the Zn, ZnO with the NaOH and generate a soluble compound as a liquid phase; reacting Fe, oxide of the Fe, C, SiO, Al2O3, CaO or the like with the NaOH and staying the reaction product into the solid phase; separating the liquid and the solid via filtering and cleaning, wherein, the solid phase filter cake contains the solid phase filter cake containing Fe, oxide of the Fe, C, SiO, Al2O3, CaO or the like, is recovered into a sinter to reuse; the liquid phase containing the Zn soluble compound is neutralized by H2SO4 to convert the Zn into Zn(OH)2 precipitation, thereby obtaining the Zn(OH)2 filter cake after filtering and cleaning to be used for producing the other zinc product; the filtrate as Na2SO2 solution can be used to recover the Na2SO2.

Description

technical field [0001] The invention relates to the field of resource reuse, in particular to comprehensive recycling of dust from zinc-containing blast furnaces and electric furnaces. Background technique [0002] The iron and steel industry is an important basic industry and pillar industry of the national economy. With the rapid development of the national economy, driven by the strong market, the steel output has grown rapidly. With the rapid development of the iron and steel industry, the consumption of iron ore, coal, coke, auxiliary raw materials, electric energy, water, etc. has also increased, and the generation of waste gas, waste water, and waste residue has also increased significantly. Energy conservation, emission reduction, and consumption reduction have become the most important tasks to maintain the sustainable development of the iron and steel industry. [0003] In the blast furnace ironmaking process, the fine solids contained in the blast furnace flue g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B19/30C22B7/02
CPCY02P10/20
Inventor 史汉祥
Owner 史汉祥
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