Hot-pressed iron coke for ironmaking and preparation method thereof

A technology of iron coke and hot press forming, which is applied in the field of iron and steel metallurgy, can solve the problems of complex whole process, high raw material performance requirements, increased ash content, etc., and achieve simple production process, broad industrial application prospects, and improved gas utilization rate Effect

Active Publication Date: 2016-03-23
NORTHEASTERN UNIV LIAONING
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  • Abstract
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  • Application Information

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Problems solved by technology

[0012] (1) Carbonization is carried out in a vertical carbonization furnace for the preparation of iron coke, which requires rebuilding the vertical carbonization furnace, which requires a large investment and is not suitable for domestic production, and the gas used in the preparation process needs to be processed multiple times. The whole process is relatively complicated and the output lower;
[0013] (2) Some methods need to use expensive binders to ensure the strength of iron coke, which increases the cost sharply. At the same time, inorganic binders contain impurity elements such as Na, K, Cl, etc., organic binders do not have high temperature strength, and composite adhesives The binder contains high Si elements, and the ash content increases;
[0014] (3) Some methods use metal waste liquid immersion to improve the reactivity of iron coke, because the waste liquid contains more metals such as nickel and zinc, if the blast furnace uses this iron coke for a long time, the life of the blast furnace will be reduced;
[0015] (4) Some methods use coke ovens for production, and the service life of most coke ovens in China is about to expire, and the investment in new construction or renovation of coke ovens is large, so it is not suitable for popularization and use;
[0016] (5) Some methods add nearly half or more coking coal, which has limited coke saving effect and limits the promotion and use of coking coal-free areas.
In addition, some methods have higher requirements on the performance of raw materials, thus limiting the range of raw materials

Method used

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  • Hot-pressed iron coke for ironmaking and preparation method thereof
  • Hot-pressed iron coke for ironmaking and preparation method thereof
  • Hot-pressed iron coke for ironmaking and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] This invention is in its implementation process, with iron ore powder, bituminous coal powder and anthracite coal powder used by a certain company as raw materials, the main components of iron ore powder used are shown in Table 1, and the chemical components of bituminous coal used are shown in Table 2. The chemical composition of anthracite is shown in Table 3. Among iron ore powders, 100% have particle sizes less than 0.15mm, and 60% have particle sizes less than 0.075mm; among The colloidal layer index is 11; in the anthracite coal powder, the particle size is less than 0.15mm, accounting for 100%, and the particle size is less than 0.075mm, accounting for 70%.

[0037] Table 1 The main components of a certain iron ore powder

[0038]

[0039] Table 2 Industrial analysis of a bituminous coal powder

[0040]

[0041] Table 3 Industrial analysis of an anthracite coal powder

[0042]

[0043] The hot-pressed iron coke is batched according to the mass percent...

Embodiment 2

[0047] Iron ore powder, bituminous coal powder, and anthracite coal powder in Example 1 are used as raw materials.

[0048] The hot-pressed iron coke is batched in proportions of 20% of iron ore powder, 70% of bituminous coal powder and 10% of anthracite coal powder according to the mass percentage. After the three materials are mixed evenly, the mixture is heated to 250°C, and then quickly hot-pressed to obtain hot-pressed iron coke green balls. The compressive strength of the green balls is 784N, and the average drop strength is 5.2 times per piece.

[0049] The iron coke green pellets are placed in a tunnel kiln, and in a non-oxidizing atmosphere, they go through three stages of heating, high-temperature carbonization, and stew cooling in a dry distillation method. The heating rate is 3°C / min, and the high-temperature carbonization temperature is 900°C. The high-temperature carbonization time is 4 hours, and after taking it out, the stewed material is cooled to obtain hot-p...

Embodiment 3

[0052] Iron ore powder, bituminous coal powder, and anthracite coal powder in Example 1 are used as raw materials.

[0053] The hot-pressed iron coke is batched according to the mass fraction of iron ore powder 15%, bituminous coal powder 75%, and anthracite coal powder 10%. After the three materials are mixed evenly, the mixture is heated to 300°C, and then hot-pressed to form hot-pressed iron coke green balls. The compressive strength of the green balls is 980N, and the average drop strength is 6.5 times per piece.

[0054] The iron coke green pellets are placed in a tunnel kiln, and in a non-oxidizing atmosphere, they go through three stages of heating, high-temperature carbonization, and stew cooling in a dry distillation method. The heating rate is 3°C / min, and the high-temperature carbonization temperature is 1000°C. The high-temperature carbonization time is 3 hours, and after taking it out, the stewed material is cooled to obtain hot-pressed iron coke.

[0055] The si...

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Abstract

The invention belongs to the technical field of iron-making and specifically relates to hot briquetted iron coke for iron-making and a preparation method thereof. The hot briquetted iron coke is composed of the following raw materials in percentage by mass: 10%-30% of iron ore powder, 60%-80% of pulverized soft coal and 10%-20% of pulverized blind coal. The preparation method comprises the following steps: thoroughly and evenly mixing the raw materials to obtain a mixture, heating the mixture in a heating furnace to 200-350 DEG C, performing instant hot briquetting on the mixture to obtain a hot briquetted iron coke green ball, putting the hot briquetted iron coke green ball in a tunnel kiln and performing high-temperature destructive distillation and carbonization at a certain temperature increased previously at a certain rate, and then taking out the braised material for cooling, thereby obtaining the hot briquetted iron coke. The prepared hot briquetted iron coke has excellent compressive strength, abrasive resistance, reactivity and post-reaction strength; the hot briquetted iron coke is used for blast furnace iron-making instead of partial coke, and therefore, the adaptability of blast furnace iron-making to fuels is improved. The preparation method of the hot briquetted iron coke is wide in raw material source, low in production cost, simple in process flow and free from the use of a binder, and has wide industrial application prospect.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a hot-pressed iron coke for ironmaking and a preparation method thereof. Background technique [0002] my country's coal resources have a complete range of coal types, including coals of various coalification stages from lignite to anthracite, but the quantity and distribution are extremely uneven, especially for coking coal, which is relatively small, due to ash content, sulfur content, selectivity, etc. For this reason, high-quality coking coal is even more scarce. Blast furnace smelting requires a large amount of high-quality metallurgical coke. With the rapid development of my country's iron and steel industry, the demand for coke is gradually increasing. Due to the uneven distribution of coking coal resources in my country, the coke production is strictly limited due to the high energy consumption of the coking process and serious environmental pollution, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10B57/06
Inventor 储满生柳政根王宏涛赵伟唐珏冯聪
Owner NORTHEASTERN UNIV LIAONING
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