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Method for absorbing sulfur dioxide in sintering flue gas using blast furnace smoke as absorbing agent

A technology of sulfur dioxide and sintering flue gas, which is applied in the direction of chemical instruments and methods, separation methods, and separation of dispersed particles, which can solve problems such as reducing the service life of blast furnaces, nodules on the upper part of the furnace body, and upturning of blast furnace tuyeres to reduce emissions Effect

Active Publication Date: 2009-04-22
史汉祥
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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 with a high content. Blockage of the rising pipe and dust bag, deterioration of coke’s high-temperature metallurgical properties (thermal reactivity and post-reaction strength), etc., affect the normal operation of the blast furnace system and reduce the service life of the blast furnace

Method used

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  • Method for absorbing sulfur dioxide in sintering flue gas using blast furnace smoke as absorbing agent

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Embodiment Construction

[0028] Such as figure 1 As shown, the blast furnace dust is prepared into a blast furnace dust "slurry" with a mass concentration of 5% to 20% in the slurry mixing tank with water and the returned lotion and filtrate in the filtering and washing process.

[0029] The specific method of pulping is to pump the lotion and filtrate from the corresponding liquid storage tanks to the pulping tank respectively to reach the predetermined scale position. When there is no washing liquid at the beginning and the filtrate is returned, or the amount of washing liquid and filtrate is not enough, add water to supplement.

[0030] The blast furnace dust is quantitatively added to the slurry mixing tank through the screw feeder through the storage hopper, and under the action of the mixer, it is prepared together with the liquid in the tank to form a blast furnace dust "slurry" with a concentration of 5% to 20% by mass. Slurry adjustment is discontinuous operation. Two slurry adjustment tanks...

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Abstract

The invention relates to a method for absorbing sulfur dioxide in sintering gases by taking blast furnace flue gases as an absorbing agent. The blast furnace flue gas is made into blast furnace pulp by water and washing liquid or filter liquor returned to the filter washing process, the pulp is fully contacted with the sintering gas in sulfur dioxide absorbing equipment, and filled with air for oxidation, and the pH value of the pulp after desulfurization is controlled; the reaction product is filtered and washed, the filter cake containing ferriferous oxide F2O3, FeO and C which do not take part in the reaction, CaSO4 newly generated and the like is taken as an ironmaking material and returns to a sintering machine, the washing liquid and the filter liquor are returned to prepare the blast furnace pulp, and when the concentration of Zn<++> in the filter liquor meets a required value, the filter liquor is taken to be processed into zinc products. The method has the advantages of reducing the emission of sulfur dioxide, separating zinc which causes adverse effects on ironmaking from the blast furnace flue gas, making Fe, C and Zn in the blast furnace flue gas fully utilized, and killing two birds with one stone.

Description

technical field [0001] The invention belongs to the technical field of recycling and reuse of energy-saving and environment-friendly resources, and relates to the treatment of flue gas of sulfur dioxide, in particular to a method for absorbing sulfur dioxide in sintering flue gas by using blast furnace dust as an absorbent. 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. In 2007, my country's crude steel output reached 489 million tons, and pig iron output reached 469 million tons. 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, emis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/80B01D53/50
Inventor 史汉祥
Owner 史汉祥
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