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A method for preparing high-strength iron-making coke from chemical waste

A waste and high-strength technology, applied in the field of coal chemical industry, can solve problems such as low utilization value and lack of economy, achieve the effects of reducing burning loss, meeting quality requirements, improving quality strength and utilization value of coke powder

Active Publication Date: 2020-11-20
ANGANG STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The coke powder obtained from pulverized coal after high-temperature dry distillation at 1100-1150°C is used as a common fuel, with low utilization value and lack of economy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Pre-grind the coke powder, coal powder, and asphalt tailings produced in the coking process to less than 1mm respectively. Pulverized coal includes gas coal, 1 / 3 coking coal, fat coal, coking coal and lean coal. The specific ratio is as follows:

[0023] coal type gas coal 1 / 3 coking coal Fat coal coking coal lean coal Proportion 5％ 15％ 15％ 50％ 15％

[0024] The volatile content of mixed coal powder is 22.0%, the ash content is 10.0%, and the sulfur content is 0.60%. The volatile content of coke powder is 1.5%, the ash content is 12.5%, and the sulfur content is 0.75%.

[0025] (2) Mixing treatment. Mix the ground coke powder and coal powder by a mixer for 2 hours, wherein 20% of coke powder and 80% of coal powder. After the dry material is mixed, add 1% water and 8% asphalt tailings by mass, and continue mixing for 2 hours. The softening point of the asphalt tailings is 120°C, the ash content is 0.4%, and the moisture content is ...

Embodiment 2

[0032] (1) Pre-grind the coke powder, coal powder and waste resin produced in the coking process to less than 0.1mm. Pulverized coal includes gas coal, 1 / 3 coking coal, fat coal, coking coal and lean coal. The specific ratio is as follows:

[0033] coal type gas coal 1 / 3 coking coal Fat coal coking coal lean coal Proportion 5％ 10％ 20％ 45％ 20％

[0034] The volatile content of mixed coal powder is 24.0%, the ash content is 11%, and the sulfur content is 0.62%. The volatile content of coke powder is 2.0%, the ash content is 11.5%, and the sulfur content is 0.75%.

[0035] (2) Mixing treatment. Mix the ground coke powder and coal powder by a mixer for 4 hours, wherein 50% of coke powder and 50% of coal powder. After the dry material is mixed, add 2% water and 5% waste resin by mass, and continue mixing for 1 hour. The softening point of the waste resin is 140°C, the ash content is 0.5%, and the water content is 5.0%.

[0036] (3) Pressure gran...

Embodiment 3

[0042] (1) Pre-grind the coke powder, coal powder and waste resin produced in the coking process to less than 0.2mm. Coal powder includes 1 / 3 coking coal, fat coal, coking coal and lean coal. The specific ratio is as follows:

[0043] coal type 1 / 3 coking coal Fat coal coking coal lean coal Proportion 15％ 24％ 45％ 16％

[0044] The volatile content of mixed coal powder is 20.5%, the ash content is 11%, and the sulfur content is 0.67%. The volatile content of coke powder is 1.8%, the ash content is 11.8%, and the sulfur content is 0.70%.

[0045] (2) Mixing treatment. Mix the ground coke powder and coal powder by a mixer for 2 hours, wherein coke powder is 70% and coal powder is 30%. After the dry material is mixed, add 2% water and 5% waste resin by mass, and continue mixing for 3 hours. The softening point of the waste resin is 140°C, the ash content is 0.5%, and the water content is 5.0%.

[0046] (3) Pressure granulation. Use granulation equi...

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Abstract

The invention provides a method for preparing high-strength iron-making coke by using chemical waste. According to the method, pre-grinding, material mixing, pressure granulation, surface spray coating, rolling bonding, drying hardening and high-temperature coking manners are used to prepare the high-strength iron-making coke, especially the high-value reuse of the chemical waste including the coke powder is realized by using the cohesive effect of a liquid phase precipitated by a carbon-contained waste binder on the coke powder in the heating coking process and reduction of burning loss on the surface of a granulation material in the heating process by the coke powder adhered to the surface, the strength and quality of the coke are improved; and the crushing strength M40 of the coke obtained after coking in a high-temperature retorting device is >=91.2%, the abrasion resistance M10 is <=5.5%, and the coke post-reaction strength (CSR) is >=67%, all the above values reach a class I standard for coke for blast furnace ironmaking, and supply of ironmaking blast furnace raw materials is realized.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry, and in particular relates to a method for preparing high-strength coke for ironmaking by utilizing chemical waste. Background technique [0002] A large amount of coke dust will be generated in the process of coking, coke pushing, coke quenching and coke transfer. Due to the small particle size of these coke dust, the use of ironmaking production will affect the air permeability of the blast furnace, and even cause difficulty in tapping the blast furnace. Therefore, iron and steel and coking enterprises generally use bag dust removal to collect and treat these wastes, mainly using ordinary fuels in sintering , Refractory field. Coke powder obtained from coal powder after high-temperature dry distillation at 1100-1150°C is used as a common fuel, which has low utilization value and lack of economy. For this reason, it is necessary to find a method to reuse these coke powders with h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10B53/00C10B53/04C10B57/00C10B57/10
CPCC10B53/00C10B53/04C10B57/00C10B57/10
Inventor 武吉庞克亮梁财谭啸张允东刘冬杰王超朱庆庙蔡秋野刘福军
Owner ANGANG STEEL CO LTD
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