Coking composite leaning agent and preparation method thereof

Abstract

The invention discloses a coking composite leaning agent and a preparation method thereof. The coking composite leaning agent comprises the following raw materials in percentage by mass: 5 to 15 percent of anthracite, 10 to 30 percent of coke powder, 3 to 10 percent of coal tar pitch and the balance of magnesite. The preparation method of the coking composite leaning agent mainly comprises the following steps of: mixing the magnesite, the anthracite and the coke powder in the atmosphere of hydrogen, performing ball milling on the mixture, adding the coal tar pitch into the mixture, and then performing ball milling on the mixture. The coking composite leaning agent of the invention has the advantages of reducing coke sulphur content, improving the mechanical strength of cokes and increasing CO content and CO2 content of the gas, along with low cost of the raw materials, simple preparation method and the like.

Description

technical field

[0001] The invention belongs to the technical field of coal chemical industry, and in particular relates to a coal coking composite thinning agent and a preparation method of the coal coking composite thinning agent. Background technique

[0002] The coke produced by the coal coking process can be used in blast furnace ironmaking, and the by-product coke oven gas can be used to synthesize methanol. As far as coke is concerned, reducing its sulfur content and improving its mechanical strength are beneficial to blast furnace ironmaking. For coke oven gas, increase its CO and CO 2 content is beneficial to the synthesis of methanol.

[0003] When coke is used in blast furnace ironmaking, sulfur content is an important index. High sulfur content will cause the produced pig iron to have high sulfur content and poor quality, or the operation index of blast furnace will decrease due to the need to increase the alkalinity of slag. Generally, for every 0.1% increase...

Examples

Embodiment 1

[0026] The magnesite ore (MgCO 3 content > 97%), anthracite from Jincheng Coal Mine in Shanxi (total sulfur S t，ad 0.51%, organic sulfur S org，ad 0.24%), coke powder (sulfur S t，ad 0.71%, organic sulfur S org，ad0.37%) and coal tar pitch (112° C. of softening point) as raw materials; the selected four kinds of raw materials are respectively crushed to a particle size of 25mm after 500 revolutions measured by a small drum 25 Characterization, abrasion resistance is measured by the mass percentage M of coke with particle size 10 Characterization; Determination of organic sulfur content S org，ad ; CO in the gas sample 2 and CO content were measured with an Austenitic gas analyzer. Experimentally measured, when no thinning agent is added, the organic sulfur content of coke S org，ad 0.29%, crushing strength M 25 90.3%, abrasion resistance M 10 6.9%, CO in gas 2 and CO content are 2.1% and 7.3% respectively; when adding 10% compound thinning agent, the organic sulfur conten...

Embodiment 2

[0028] The difference from Example 1 is that the proportioning of the four raw materials for preparing the composite thinner is: 82% magnesite ore, 5% anthracite, 10% coke powder, 3% coal tar pitch; magnesite When the ore, anthracite, and coke powder are mixed and ball milled, the hydrogen atmosphere pressure is 0.2MPa, the ball milling time is 1 hour, and the ball milling time is 1.5 hours after adding coal tar pitch; the dosage of the obtained composite thinner in coking coal is 5%; According to the coking test, the organic sulfur content of coke S org，ad 0.24%, crushing strength M 25 91.2%, abrasion resistance M 10 6.5%, CO in gas 2 and CO content were 3.8% and 8.6%, respectively.

Embodiment 3

[0030] The difference from Example 1 is that the proportioning of the four raw materials for preparing the composite thinner is: 45% magnesite ore, 15% anthracite, 30% coke powder, 10% coal tar pitch; magnesite When the ore, anthracite, and coke powder are mixed and ball milled, the hydrogen atmosphere pressure is 0.5 MPa, the ball milling time is 3 hours, and the ball milling time is 0.5 hour after adding coal tar pitch; the dosage of the obtained composite thinner in coking coal is 7%; According to the coking test, the organic sulfur content of coke S org，ad 0.25%, crushing strength M 25 93.1%, abrasion resistance M 10 6.0%, CO in gas 2 and CO content were 3.1% and 8.2%, respectively.

technical field

[0001] The invention belongs to the technical field of coal chemical industry, and in particular relates to a coal coking composite thinning agent and a preparation method of the coal coking composite thinning agent. Background technique

[0002] The coke produced by the coal coking process can be used in blast furnace ironmaking, and the by-product coke oven gas can be used to synthesize methanol. As far as coke is concerned, reducing its sulfur content and improving its mechanical strength are beneficial to blast furnace ironmaking. For coke oven gas, increase its CO and CO 2 content is beneficial to the synthesis of methanol.

[0003] When coke is used in blast furnace ironmaking, sulfur content is an important index. High sulfur content will cause the produced pig iron to have high sulfur content and poor quality, or the operation index of blast furnace will decrease due to the need to increase the alkalinity of slag. Generally, for every 0.1% increase...

Examples

Embodiment 1

[0026] The magnesite ore (MgCO 3 content > 97%), anthracite from Jincheng Coal Mine in Shanxi (total sulfur S t，ad 0.51%, organic sulfur S org，ad 0.24%), coke powder (sulfur S t，ad 0.71%, organic sulfur S org，ad0.37%) and coal tar pitch (112° C. of softening point) as raw materials; the selected four kinds of raw materials are respectively crushed to a particle size of 25mm after 500 revolutions measured by a small drum 25 Characterization, abrasion resistance is measured by the mass percentage M of coke with particle size 10 Characterization; Determination of organic sulfur content S org，ad ; CO in the gas sample 2 and CO content were measured with an Austenitic gas analyzer. Experimentally measured, when no thinning agent is added, the organic sulfur content of coke S org，ad 0.29%, crushing strength M 25 90.3%, abrasion resistance M 10 6.9%, CO in gas 2 and CO content are 2.1% and 7.3% respectively; when adding 10% compound thinning agent, the organic sulfur conten...

Embodiment 2

[0028] The difference from Example 1 is that the proportioning of the four raw materials for preparing the composite thinner is: 82% magnesite ore, 5% anthracite, 10% coke powder, 3% coal tar pitch; magnesite When the ore, anthracite, and coke powder are mixed and ball milled, the hydrogen atmosphere pressure is 0.2MPa, the ball milling time is 1 hour, and the ball milling time is 1.5 hours after adding coal tar pitch; the dosage of the obtained composite thinner in coking coal is 5%; According to the coking test, the organic sulfur content of coke S org，ad 0.24%, crushing strength M 25 91.2%, abrasion resistance M 10 6.5%, CO in gas 2 and CO content were 3.8% and 8.6%, respectively.

Embodiment 3

[0030] The difference from Example 1 is that the proportioning of the four raw materials for preparing the composite thinner is: 45% magnesite ore, 15% anthracite, 30% coke powder, 10% coal tar pitch; magnesite When the ore, anthracite, and coke powder are mixed and ball milled, the hydrogen atmosphere pressure is 0.5 MPa, the ball milling time is 3 hours, and the ball milling time is 0.5 hour after adding coal tar pitch; the dosage of the obtained composite thinner in coking coal is 7%; According to the coking test, the organic sulfur content of coke S org，ad 0.25%, crushing strength M 25 93.1%, abrasion resistance M 10 6.0%, CO in gas 2 and CO content were 3.1% and 8.2%, respectively.

Images