Special pressed carbon block for blast-furnace ironmaking as well as manufacturing and using methods thereof

Abstract

The invention relates to a special pressed carbon block for blast-furnace ironmaking as well as manufacturing and using methods thereof, belonging to the technical field of pressed carbon block products capable of partially or totally replacing cokes in the blast-furnace ironmaking process as well as the manufacturing and using methods thereof. The pressed carbon block is characterized by being obtained with coal as a basic raw material through pressing and dry distilling and solidifying processing, and having the apparent density not less than 980 kg / m<3> and the granularity not less than 15mm and not more than 290 mm. The manufacturing method of the pressed carbon block comprises the following steps of: blending coal; grinding; mixing; cooling, and the like. The manufacturing method ofthe pressed carbon block is characterized by also comprising the following steps of: pressing; dryly distilling; and solidifying. In the coal blending step, coal needs to be ensured to contain a proper amount of viscous components after coal blending; and in the grinding step, the granularity of coal powder is required to be controlled within a range of 0-1.2 mm. In the using method of the pressed carbon block, not less than 3 percent of the cokes are replaced by utilizing the special pressed carbon block for the blast-furnace ironmaking.

Description

technical field [0001] The invention relates to a special pressed carbon block for blast furnace ironmaking and its manufacturing and using method, and belongs to the technical field of pressed carbon block products capable of partially or even completely replacing coke in the blast furnace ironmaking process and its manufacturing and using methods. Background technique [0002] On the one hand, the use of coke in blast furnace ironmaking seems to be a matter of course. Coke has three main functions in the blast furnace smelting process: one is to provide fuel for blast furnace smelting to generate heat, the other is to use it as material column and aggregate; the third is to provide reducing agent and carburizing agent for blast furnace. With the continuous increase of hot air temperature and blast furnace coal injection intensity, the reduction of coke ratio, the fuel function of most coke and the function of reducing agent and carburizing agent are gradually replaced. How...

AI Technical Summary

Problems solved by technology

[0006] 1. Limited by the resources, price and coking process of coking coal, the internal cracks of coke are unavoidable, the uniformity of the internal structure is low, the internal pores are large, the porosity is high, and the apparent density is low. Therefore, its quality , especially its wear resistance, crush resistance and strength at high temperature are more difficult to further improve

[0007] 2. The particle size or block size of the finished coke is obtained by crushing and screening. On the one hand, the generation of a large number of broken coke and coke powder is inevitable, and the amount that needs to be returned for reprocessing is also large. This The existence of the process itself is a waste; on the other hand, the particle size or block size of the coke produced by the crushing method is distributed according to a certain law. If the particle size or block size is purely theoretically optimized, It will lead to more broken coke and further increase the cost of coke. Therefore, the current requirements for the particle size or block size of coke are the product of a compromise between the best solution and cost, rather than the real best.

[0008] 3. Under the current production conditions, the shape of coke is naturally formed during the crushing process, and it is unimaginable to put forward special requirements for its shape

[0010] 5. Under the conditions of the existing technology, the demand for coking coal is an increasing rigid demand. Therefore, the price of coking coal keeps rising, which has become a heavy burden for iron and steel enterprises

[0011] 6. During the coking process, serious pollution will be produced, which is not compatible with the increasingly stringent environmental protection requirements

[0012] 7. If the above problems cannot be solved in a relatively short period of time, it is inevitable that blast furnace ironmaking will be eliminated by non-blast furnace ironmaking, which means that the blast furnace ironmaking experience accumulated by people over hundreds of years may be abandoned. It is a great waste of social public resources

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