CN113755191B - Coke containing domestic garbage incineration ash and preparation method thereof - Google Patents

Abstract

The invention discloses coke containing municipal solid waste incineration ash and a preparation method thereof. The coke raw material consists of ash and clean coal, the preparation method is simple and is easy for large-scale industrial application, a novel raw material is provided for the field of coking and coal blending, and the consumption of clean coal is saved; the prepared coke completely meets the requirements of industries such as iron making, smelting, chemical engineering and the like, and the industries have huge capacity and scale, are beneficial to the consumption and utilization of ash slag, and have environmental protection and economic values.

Description

Coke containing domestic garbage incineration ash and preparation method thereof

Technical Field

The invention belongs to the technical field of treatment and recycling of residues generated after incineration of municipal solid waste, and particularly relates to coke containing municipal solid waste incineration ash and a preparation method thereof.

Background

With the enhancement of the reduction, harmlessness and recycling of the domestic waste treatment by the government, the domestic waste treatment becomes an important component of urban management and public service, and according to the situation of China and related technologies, the domestic waste incineration treatment becomes a better treatment mode at present. Incineration ash is an inevitable by-product in the incineration process of municipal solid waste, is a residue after the incineration of the municipal solid waste, and the generation amount of the incineration ash depends on the waste components, and the main components are manganese oxide, silicon dioxide, calcium oxide, aluminum trioxide, ferric trioxide, waste metals, a small amount of unburned organic matters and the like. The common methods for disposing the incineration ash mainly comprise the following steps: cement solidification, asphalt solidification, melting solidification technology, chemical agent solidification stabilization and the like, and products obtained after solidification stabilization can enter a common landfill site for landfill treatment if the products meet leaching toxicity standards or resource utilization standards. However, with the decrease of landfill sites and the increase of disposal cost, how to adopt appropriate technologies to treat incineration fly ash and achieve the goals of stabilization, reclamation and harmlessness has become an important civil science and technology project at present.

The coking production is a process of adding blended coal into a coke oven to isolate air and heating for high-temperature carbonization. During the heating process, the coal undergoes a series of irreversible physicochemical changes with increasing temperature, forming a gas (coal gas), a liquid (tar) and a solid (coke). The coke is the main product of high-temperature dry distillation coking of coal, is mainly used for blast furnace ironmaking and blast furnace smelting of nonferrous metals, and is also used for casting, chemical engineering, calcium carbide and ferroalloy, and plays roles of a reducing agent, a heating agent and a material column framework. The main components of the coke are carbon and a small amount of ash, and the ash components mainly comprise silicon dioxide, aluminum oxide, calcium oxide, ferric trioxide, manganese oxide and the like, are from raw material coal and are close to ash components. The national coking capacity reaches more than 5 hundred million tons, and the capacity is huge. On the premise of not affecting the performance of a coke product, the preparation of coke by blending the burned ash with coal not only expands the outlet path of the ash, realizes the treatment and utilization of the ash, but also saves the consumption of clean coal.

Disclosure of Invention

The invention provides a coke containing municipal refuse incineration ash and a preparation method thereof, which realize the recycling, reduction and harmless comprehensive treatment and utilization of the municipal refuse incineration ash.

An object of the present invention is to provide a coke containing municipal refuse incineration ash, wherein the coke raw material is composed of ash and washed coal, the ash content is 0.1-8% by mass percent, washed coal is additionally added, based on 100% by weight of the washed coal, the washed coal content is one or more of long flame coal, weakly caking coal, gas fat coal, 1/3 coke, fat coal, lean coal and anthracite.

Preferably, an object of the present invention is to provide a metallurgical coke containing municipal refuse incineration ash, the metallurgical coke raw material consisting of ash and clean coal, the ash content being 0.1% to 1% by mass, the clean coal being additionally added, the clean coal comprising 15% to 30% of gas coal, 10% to 30% of gas fat coal, 0% to 30% of 1/3 coke coal, 0% to 15% of coke coal, 10% to 25% of fat coal, 0% to 20% of lean coal, 10% to 25% of lean coal, based on 100% by weight of clean coal.

Preferably, an object of the present invention is to provide a gasification coke containing municipal refuse incineration ash, wherein the gasification coke raw material consists of ash and clean coal, and the clean coal comprises, by mass, 0% -25% of long flame coal, 15% -35% of gas fat coal, 10% -30% of 1/3 coke coal, 10% -35% of fat coal, 10% -20% of lean reducing coal, and 0% -15% of anthracite.

The invention also aims to provide a method for refining the metallurgical coke containing the municipal refuse incineration ash, which comprises the following steps:

step a, screening and crushing municipal refuse incineration ash, crushing ash particles with the particle size of more than 3mm and other incompletely combusted impurities to obtain ash with the particle size of less than 3mm for later use;

step b, respectively and independently pre-crushing various components of the washed clean coal with the Hardgrove grindability index of less than 60 and the proportion of particles with the original particle size of less than 3mm of less than 60 percent to ensure that the proportion of the particles with the particle size of less than 3mm is more than or equal to 85 percent for later use;

step c, blending coal according to the following mass percentages: 0.1-1% of the ash obtained in the step a and the clean coal obtained in the step b are uniformly mixed to obtain blended coal;

d, further crushing the uniformly mixed blended coal in the step c to ensure that the blended coal with the particle size of less than 3mm accounts for 85-90% of the total mass of the blended coal;

step e, tamping the crushed blended coal in the step d, and sending the crushed blended coal into a tamping coke oven for coking, wherein the tamping density is controlled to be 1.0-1.05kg/m³；

And f, starting coking, wherein the coking time is 24-26 hours, the central temperature of a coking coke cake is 1000-1050 ℃, and after finishing coking, performing coke pushing and coke quenching to obtain metallurgical coke.

Wherein, the clean coal in the step b comprises 15-30% of gas coal, 10-30% of gas fat coal, 0-30% of 1/3 coking coal, 0-15% of coking coal, 10-25% of fat coal, 0-20% of lean coal and 10-25% of lean reducing coal by mass percentage.

In the step f, the metallurgical coke meets the following quality index requirements: ash content Ad less than or equal to 12.5%, sulfur content St less than or equal to 0.7%, crushing strength M₂₅Not less than 92 percent and abrasion resistance M₁₀Less than or equal to 7 percent, the reactivity CRI less than or equal to 28 percent, the strength CSR after reaction is more than or equal to 65 percent and meets the requirement of 2000m³And the following blast furnace requirements.

The invention also aims to provide a method for refining the gasified coke containing the municipal refuse incineration ash, which comprises the following steps:

step a, screening and crushing municipal refuse incineration ash, crushing ash particles with the particle size of more than 3mm and other incompletely combusted impurities to obtain ash with the particle size of less than 3mm for later use;

step b, respectively and independently pre-crushing the washed coal with the Hardgrove grindability index of less than 60 and the proportion of particles with the original particle size of less than 3mm of less than 60 percent to ensure that the proportion of the particles with the particle size of less than 3mm is more than or equal to 85 percent for later use;

step c, blending coal according to the following mass percentages: 2-8% of the ash obtained in the step a and the clean coal obtained in the step b are uniformly mixed to obtain blended coal;

d, crushing the uniformly mixed blended coal in the step c to enable the blended coal with the particle size of less than 3mm to account for 89-92% of the total mass of the blended coal;

step e, tamping the crushed mixed coal obtained in the step d, and conveying the crushed mixed coal into a tamping coke oven for coking; the tamping density is controlled to be 1.0-1.05kg/m³；

And f, starting coking, wherein the coking time is 24-26 hours, the central temperature of a coking coke cake is 1050-1150 ℃, and after coking, performing coke pushing and coke quenching to obtain gasified coke.

Wherein, the clean coal in step b comprises 0-25% of long flame coal, 15-35% of gas fat coal, 10-30% of 1/3 coking coal, 10-35% of fat coal, 10-20% of lean reducing coal and 0-15% of anthracite by mass percentage.

In the step f, the quality indexes of the gasified coke are as follows: reactive CRI>50% crushing strength M₂₅Greater than 80% and abrasion resistance M₁₀<12% volatile component V<3％。

Advantageous effects

The preparation method is simple and easy for large-scale industrial application, and brings a novel raw material for the field of coking and coal blending, thereby saving the consumption of clean coal; the prepared coke completely meets the requirements of industries such as iron making, smelting, chemical engineering and the like, and the industries have huge capacity and scale, are beneficial to consumption and utilization of ash slag, and have environmental protection and economic values.

Detailed Description

Hereinafter, the present invention will be described in detail. Before the description is made, it should be understood that the terms used in the present specification and the appended claims should not be construed as limited to general and dictionary meanings, but interpreted based on the meanings and concepts corresponding to technical aspects of the present invention on the basis of the principle that the inventor is allowed to define terms appropriately for the best explanation. Accordingly, the description proposed herein is just a preferable example for the purpose of illustrations only, not intended to limit the scope of the invention, so it should be understood that other equivalents and modifications could be made thereto without departing from the spirit and scope of the invention.

Metallurgical coke is a generic term for blast furnace coke, foundry coke, ferroalloy coke and non-ferrous metal smelting coke. Since more than 90% of metallurgical coke is used in blast furnace ironmaking, blast furnace coke is often called metallurgical coke.

Gasified coke refers to coke that is used exclusively for producing coal gas. Is mainly used for fixingIn a static slagging fixed bed gas producer, CO and H are produced as gasification raw materials₂Is coal gas with combustible components.

According to different purposes, the metallurgical coke and the gasified coke have different performance requirements, and the content of adulterable ash residue is also different.

The inventor finds that the ash can be melted into liquid molten slurry at the temperature of more than 1000 ℃, and the molten slurry is embedded into coke air holes and adsorbed on the surface of the coke so as to achieve the purpose of volume reduction; in addition, dioxin substances in the ash are decomposed at high temperature, the toxicity of coke products prepared from the ash is reduced, and the standard value of the standard for identifying the leaching toxicity of national hazardous wastes (GB5085.3-2007) is met, so that the coke containing the municipal refuse incineration ash has no harmful elements and no ecological risk, and belongs to an environment-friendly product.

The analysis on the content of metal elements in the municipal refuse incineration ash shows that the content of alkali metal elements in the ash is low, the content of acid elements (silicon, aluminum and titanium) is high, and when a small proportion of the municipal refuse incineration ash is applied to coking and coal blending to produce metallurgical coke, the acidity and alkalinity in the ash elements can be changed, the heat strength of the coke can be improved, and the quality of the coke is optimized; when the ash content ratio is increased and the catalytic action is strengthened when the ash content ratio is increased and the coal blending is applied to the production of gasified coke by coking, the reaction activity of the coke is greatly improved, and the requirement that the reaction activity CRI (at 1100 ℃) of the gasified coke is more than 50% is met. According to the different production processes of the metallurgical coke and the gasified coke, the harmless and resource treatment of the waste incineration ash is realized.

The following examples are given by way of illustration of embodiments of the invention and are not to be construed as limiting the invention, and it will be understood by those skilled in the art that modifications may be made without departing from the spirit and scope of the invention. Unless otherwise specified, reagents and equipment used in the following examples are commercially available products.

The present invention will be further described with reference to the following examples.

Examples 1 to 4: preparation of metallurgical coke containing municipal refuse incineration ash

Taking ash residue after incineration of a certain municipal refuse dump, analyzing ash components according to oxide form, wherein K is₂O is 0.09%, Na₂0.45% of O, 0.21% of CaO and Fe₂O₃0.33% of MgO, 0.09% of SiO₂52.2%; al (Al)₂O₃42.7 percent; TiO 2₂2.3%, the other 1.63%.

Example 1:

screening and crushing the ash, and crushing ash particles with the particle size of more than 3mm and other incompletely combusted impurities to obtain ash with the particle size of less than 3mm for later use.

The method comprises the steps of respectively and independently pre-crushing various components of washed coal with the Hardgrove grindability index of less than 60 and the proportion of the original particle size of less than 3mm of less than 60% so that the proportion of particles with the particle size of more than 3mm is more than or equal to 85% for later use.

Blending coal according to the following mass percentages: ash 0.1%, gas coal 17%, gas fat coal 20%, 1/3 coking coal 18%, coking coal 7%, fat coal 16%, lean coal 8%, lean reducing coal 14%; and uniformly mixing to obtain blended coal; then crushing to obtain 89.5 percent of blended coal with the particle size of less than 3mm based on the total mass of the blended coal;

then tamping and sending the mixture into a tamping coke oven for coking, wherein the tamping density is 1.04kg/m³After 25.5 hours, the central temperature of the coking coke cake reaches 1030 ℃, and the coke is mature. And then coke pushing and coke quenching are carried out to obtain the metallurgical coke containing the municipal refuse incineration ash.

Example 2:

screening and crushing the ash, and crushing ash particles with the particle size of more than 3mm and other incompletely combusted impurities to obtain ash with the particle size of less than 3mm for later use.

The method comprises the steps of respectively and independently pre-crushing various components of washed coal with the Hardgrove grindability index of less than 60 and the proportion of the original particle size of less than 3mm of less than 60% so that the proportion of particles with the particle size of more than 3mm is more than or equal to 85% for later use.

Blending coal according to the following mass percentages: ash 0.3%, gas coal 15%, gas fat coal 21%, 1/3 coking coal 18%, coking coal 6%, fat coal 20%, lean coal 10%, lean reducing coal 10%; and uniformly mixing to obtain blended coal; then crushing to obtain 90.2 percent of blended coal with the particle size of less than 3mm based on the total mass of the blended coal;

then tamping and sending the mixture into a tamping coke oven for coking, wherein the tamping density is 1.05kg/m³After 25.5 hours, the center temperature of the coking coke cake reaches 1035 ℃, and the coke is mature. And then coke pushing and coke quenching are carried out to obtain the metallurgical coke containing the municipal refuse incineration ash.

Example 3:

screening and crushing the ash, and crushing ash particles with the particle size of more than 3mm and other incompletely combusted impurities to obtain ash with the particle size of less than 3mm for later use.

The method comprises the steps of respectively and independently pre-crushing various components of washed coal with the Hardgrove grindability index of less than 60 and the proportion of the original particle size of less than 3mm of less than 60% so that the proportion of particles with the particle size of more than 3mm is more than or equal to 85% for later use.

Blending coal according to the following mass percentages: ash 0.7%, gas coal 15%, gas fat coal 20%, 1/3 coking coal 20%, fat coal 23%, lean coal 12%, lean reducing coal 10%; and uniformly mixing to obtain blended coal; then crushing to obtain 90.3 percent of blended coal with the particle size of less than 3mm based on the total mass of the blended coal;

then tamping and sending the mixture into a tamping coke oven for coking, wherein the tamping density is 1.07kg/m³After 25.5 hours, the central temperature of the coking coke cake reaches 1050 ℃, and the coke is mature. And then coke pushing and coke quenching are carried out to obtain the metallurgical coke containing the municipal refuse incineration ash.

Example 4:

screening and crushing the ash, and crushing ash particles with the particle size of more than 3mm and other incompletely combusted impurities to obtain ash with the particle size of less than 3mm for later use.

The method comprises the steps of respectively and independently pre-crushing various components of washed coal with the Hardgrove grindability index of less than 60 and the proportion of the original particle size of less than 3mm of less than 60% so that the proportion of particles with the particle size of more than 3mm is more than or equal to 85% for later use.

Blending coal according to the following mass percentages: 1% ash, 16% gas coal, 27% gas fat coal, 15% 1/3 coking coal, 10% coking coal, 22% fat coal, 10% lean reducing coal; and uniformly mixing to obtain blended coal; then crushing to obtain blended coal with the particle size of less than 3mm accounting for 91.4% of the total mass of the blended coal;

then tamping and sending the mixture into a tamping coke oven for coking, wherein the tamping density is 1.05kg/m³After 25.5 hours, the central temperature of the coking coke cake reaches 1045 ℃, and the coke is mature. And then coke pushing and coke quenching are carried out to obtain the metallurgical coke containing the municipal refuse incineration ash.

Comparative example 1: production of ash-free conventional metallurgical coke

The method comprises the following steps of respectively and independently pre-crushing various components of washed clean coal with a Hardgrove grindability index of less than 60 and a primary particle size of less than 3mm in a proportion of less than 60% so that the proportion of particles with particle sizes of more than 3mm is more than or equal to 85% for later use.

Blending coal according to the following mass percentages: 18% of gas coal, 27% of gas-rich coal, 15% of 1/3 coking coal, 10% of coking coal, 20% of fat coal and 10% of lean reducing coal; and uniformly mixing to obtain blended coal; then crushing to obtain blended coal with the particle size of less than 3mm accounting for 91 percent of the total mass of the blended coal;

then tamping and sending the mixture into a tamping coke oven for coking, wherein the tamping density is 1.05kg/m³After 25.5 hours, the central temperature of the coking coke cake reaches 1040 ℃, and the coke is mature. And then pushing and quenching coke to obtain the metallurgical coke without ash slag.

Examples 5 to 8: preparation of gasification coke containing municipal refuse incineration ash

Example 5:

screening and crushing the ash, and crushing ash particles with the particle size of more than 3mm and other incompletely combusted impurities to obtain ash with the particle size of less than 3mm for later use.

And (2) performing independent pre-crushing on each component of the washed clean coal with the Hardgrove grindability index of less than 60 and the proportion of the original particle size of less than 3mm of less than 60% respectively, so that the proportion of the particle size of more than 3mm is more than or equal to 85% for later use.

Blending coal according to the following mass percentage: 2% ash, 6% long flame coal, 15% gas coal, 22% high sulfur gas fat coal, 22% 1/3 coke coal, 13% fat coal, 18% lean reducing coal, 4% anthracite; and uniformly mixing to obtain the blended coal. Crushing again to obtain 90.0% of blended coal with the particle size of less than 3mm in the total mass;

then tamping and sending the mixture into a tamping coke oven for coking, wherein the tamping density is 1.03kg/m³After 25.5 hours, the center temperature of the coking coke cake reaches 1025 ℃, and the coke is mature. And then coke pushing and coke quenching are carried out to obtain the biomass gasification coke containing the municipal refuse incineration ash.

Example 6:

screening and crushing the ash, and crushing ash particles with the particle size of more than 3mm and other incompletely combusted impurities to obtain ash with the particle size of less than 3mm for later use.

The method comprises the steps of carrying out independent pre-crushing on each component of washed coal with a Hardgrove grindability index of less than 60 and an original particle size of less than 3mm accounting for less than 60% respectively, and enabling the proportion of the particle size of more than 3mm to be more than or equal to 85% for later use.

Blending coal according to the following mass percentages: ash residue 4%, long flame coal 5%, gas coal 8%, high sulfur gas fat coal 25%, 1/3 coking coal 28%, fat coal 15%, lean reducing coal 15%, anthracite 4%; and uniformly mixing to obtain the blended coal. Crushing again to obtain 90.0% of blended coal with the particle size of less than 3mm in the total mass;

then tamping and sending the mixture into a tamping coke oven for coking, wherein the tamping density is 1.03kg/m³After 25.5 hours, the center temperature of the coking coke cake reaches 1025 ℃, and the coke is mature. And then coke pushing and coke quenching are carried out to obtain the biomass gasification coke containing the municipal refuse incineration ash.

Example 7:

screening and crushing the ash, and crushing ash particles with the particle size of more than 3mm and other incompletely combusted impurities to obtain ash with the particle size of less than 3mm for later use.

The method comprises the steps of carrying out independent pre-crushing on each component of washed coal with a Hardgrove grindability index of less than 60 and an original particle size of less than 3mm accounting for less than 60% respectively, and enabling the proportion of the particle size of more than 3mm to be more than or equal to 85% for later use.

Blending coal according to the following mass percentages: 6% ash, 4% long flame coal, 8% gas coal, 26% high sulfur gas fat coal, 28% 1/3 coke coal, 17% fat coal, 13% lean reducing coal, 4% anthracite; and uniformly mixing to obtain the blended coal. Crushing again to obtain 90.0 percent of blended coal with the particle size of less than 3mm based on the total mass of the blended coal;

then tamping and sending the mixture into a tamping coke oven for coking, wherein the tamping density is 1.03kg/m³After 25.5 hours, the center temperature of the coking coke cake reaches 1025 ℃, and the coke is mature. And then coke pushing and coke quenching are carried out to obtain the biomass gasification coke containing the municipal refuse incineration ash.

Example 8:

screening and crushing the ash, and crushing ash particles with the particle size of more than 3mm and other incompletely combusted impurities to obtain ash with the particle size of less than 3mm for later use.

The method comprises the steps of carrying out independent pre-crushing on each component of washed coal with a Hardgrove grindability index of less than 60 and an original particle size of less than 3mm accounting for less than 60% respectively, and enabling the proportion of the particle size of more than 3mm to be more than or equal to 85% for later use.

Blending coal according to the following mass percentages: 8% ash, 8% gas coal, 26% high sulfur gas fat coal, 28% 1/3 coking coal, 17% fat coal, 17% lean reducing coal, 4% anthracite; and uniformly mixing to obtain the blended coal. Crushing again to obtain 90.0% of blended coal with the particle size of less than 3mm in the total mass;

then tamping and sending the mixture into a tamping coke oven for coking, wherein the tamping density is 1.03kg/m³After 25.5 hours, the center temperature of the coking coke cake reaches 1025 ℃, and the coke is mature. And then coke pushing and coke quenching are carried out to obtain the biomass gasification coke containing the municipal refuse incineration ash.

Comparative example 2: production of ash-free conventional gasification coke

The method comprises the steps of carrying out independent pre-crushing on each component of washed coal with a Hardgrove grindability index of less than 60 and an original particle size of less than 3mm of less than 60% respectively, and enabling the proportion of the particle size of more than 3mm to be more than or equal to 85% for later use.

Blending coal according to the following mass percentages: 5% of long-flame coal, 26% of high-sulfur gas-fat coal, 28% of 1/3 coking coal, 17% of fat coal, 13% of lean reducing coal and 11% of anthracite; and uniformly mixing to obtain the blended coal. Crushing again to obtain 90.0% of blended coal with the particle size of less than 3mm in the total mass;

then tamping and sending the mixture into a tamping coke oven for coking, wherein the tamping density is 1.03kg/m³After 25.5 hours, the center temperature of the coking coke cake reaches 1025 ℃, and the coke is mature. And then coke pushing and coke quenching are carried out to obtain the biomass gasification coke containing the municipal refuse incineration ash.

The coke quality indicators for examples 1-4 and comparative example 1 above are listed in table 1 below, and the coke quality indicators for examples 5-8 and comparative example 2 are listed in table 2 below:

TABLE 1 Coke qualities for examples 1-4 and comparative example 1

From table 1, it can be seen that the indexes of the ash content Ad and the sulfur content St of the metallurgical coke containing the municipal refuse incineration ash residue of the examples 1 to 4 are close to those of the conventional coke of the comparative example 1, and are not deteriorated, the heat strength indexes (CRI and CSR) are improved to a certain extent, the acidity and alkalinity of the coal ash elements are changed after the ash residue is mainly added, and the heat strength of the coke is improved; at the same time, the cold strength M plays a role of a certain thinning agent₂₅And M₁₀There is also a lift.

Table 2 coke quality for examples 5-8 and comparative example 2:

	Ad％	M25％	M10％	CRI％	V％	St％
							example 5	18.3	84.5	10.3	53.6	1.6	1.5
Example 6	17.5	82.3	11.7	52.5	1.4	1.6
							Example 7	18.7	83.1	12.0	54.0	1.5	1.6
Example 8	17.8	83.9	11.3	54.8	1.4	1.7
							Comparative example 2	18.5	82.0	12.0	51.2	1.7	1.7

It can be seen from table 2 that the indexes of the ash Ad, the sulfur St, and the V of the gasification coke containing municipal refuse incineration ash of examples 5 to 8 are close to those of the conventional gasification coke of comparative example 2, and are not deteriorated, the thermal reaction CRI is obviously increased, and the catalytic action is enhanced after the ash is mainly added, so that the reactivity of the coke is greatly improved; at the same time, the cold strength M plays a role of a certain thinning agent₂₅And M₁₀There is also a lift.

The ash content of the coke samples was measured and the results are shown in Table 3; it can be seen that the composition of each ash component is not changed greatly after the urban refuse incineration ash residue is added, and the acid oxide (SiO)₂、Al₂O₃) With basic oxides (Fe)₂O₃、CaO、MgO、K₂O、Na₂O) is slightly higher than the unblended coke and increases with increasing blending ratio.

Table 3:

in addition, when the heavy metal leaching experiments are carried out on the cokes prepared in the examples 4 and 8 and the conventional comparative examples 1 and 2, which have larger proportions of the municipal solid waste incineration ash, only part of toxic elements in each sample are detected, but the detected element content of all the samples is far lower than the standard value specified in the national hazardous waste identification standard leaching toxicity identification standard (GB5085.3-2007), as shown in the table 4. Therefore, the biomass coke of the invention can be judged to have no harmful elements and no ecological risk, and belongs to an environment-friendly product.

Table 4:

(ND means not detected)

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (7)

1. A coke containing municipal refuse incineration ash, wherein the coke raw material consists of ash and clean coal, the ash content is 0.1-8% by mass percent, clean coal is additionally added, based on 100% by weight of clean coal, the clean coal comprises one or more of long flame coal, weakly caking coal, gas fat coal, 1/3 coking coal, fat coal, lean coal, lean coal and anthracite.

2. A metallurgical coke containing municipal refuse incineration ash, the metallurgical coke raw material consists of ash and washed coal, the ash content is 0.1% -1% by mass percent, washed coal is additionally added, based on 100% by weight of the washed coal, the washed coal comprises 15% -30% of gas coal, 10% -30% of gas fat coal, 0% -30% of 1/3 coke coal, 0% -15% of coke coal, 10% -25% of fat coal, 0% -20% of lean coal and 10% -25% of lean reducing coal.

3. The gasification coke containing the municipal refuse incineration ash comprises 2-8% of ash and washed coal, wherein the washed coal comprises 0-25% of long flame coal, 15-35% of gas fat coal, 10-30% of 1/3 coke coal, 10-35% of fat coal, 10-20% of lean reducing coal and 0-15% of anthracite.

4. A process for refining metallurgical coke according to claim 2, comprising the steps of:

step a, screening and crushing municipal refuse incineration ash, crushing ash particles with the particle size of more than 3mm and other incompletely combusted impurities to obtain ash with the particle size of less than 3mm for later use;

step b, respectively and independently pre-crushing various components of the washed clean coal with the Hardgrove grindability index of less than 60 and the proportion of particles with the original particle size of less than 3mm of less than 60 percent to ensure that the proportion of the particles with the particle size of less than 3mm is more than or equal to 85 percent for later use;

step c, blending coal according to the following mass percentages: 0.1-1% of the ash obtained in the step a and the clean coal obtained in the step b are uniformly mixed to obtain blended coal;

d, further crushing the uniformly mixed blended coal in the step c to ensure that the blended coal with the particle size of less than 3mm accounts for 85-90% of the total mass of the blended coal;

step e, tamping the crushed blended coal in the step d, and sending the crushed blended coal into a tamping coke oven for coking, wherein the tamping density is controlled to be 1.0-1.05kg/m³；

And f, starting coking, wherein the coking time is 24-26 hours, the central temperature of a coking coke cake is 1000-1050 ℃, and after finishing coking, performing coke pushing and coke quenching to obtain metallurgical coke.

5. The method as claimed in claim 4, wherein the clean coal in step b contains, by mass%, 15% -30% of gas coal, 10% -30% of gas fat coal, 0% -30% of 1/3 coke coal, 0% -15% of coke coal, 10% -25% of fat coal, 0% -20% of lean coal, and 10% -25% of lean reducing coal;

in the step f, the metallurgical coke meets the following quality index requirements: ash content Ad less than or equal to 12.5%, sulfur content St less than or equal to 0.7%, crushing strength M₂₅Not less than 92 percent and abrasion resistance M₁₀Less than or equal to 7 percent, the reactivity CRI less than or equal to 28 percent, the strength CSR after reaction is more than or equal to 65 percent and meets the requirement of 2000m³And the following blast furnace requirements.

6. A process for refining gasified coke according to claim 3, comprising the steps of:

step a, screening and crushing municipal refuse incineration ash, crushing ash particles with the particle size of more than 3mm and other incompletely combusted impurities to obtain ash with the particle size of less than 3mm for later use;

step b, respectively and independently pre-crushing the washed coal with the Hardgrove grindability index of less than 60 and the proportion of particles with the original particle size of less than 3mm of less than 60 percent to ensure that the proportion of the particles with the particle size of less than 3mm is more than or equal to 85 percent for later use;

step c, blending coal according to the following mass percentages: 2-8% of the ash obtained in the step a and the clean coal obtained in the step b are uniformly mixed to obtain blended coal;

d, crushing the uniformly mixed blended coal in the step c to ensure that the blended coal with the particle size of less than 3mm accounts for 89-92% of the total mass of the blended coal;

step e, tamping the crushed mixed coal obtained in the step d, and conveying the crushed mixed coal into a tamping coke oven for coking; the tamping density is controlled to be 1.0-1.05kg/m³；

And f, starting coking, wherein the coking time is 24-26 hours, the central temperature of a coking coke cake is 1050-1150 ℃, and pushing and quenching coke are carried out after coking is finished to obtain gasified coke.

7. A method for refining gasified coke as defined in claim 6, wherein said washed coal in step b comprises, by mass%, 0% to 25% of long-flame coal, 15% to 35% of gas-fat coal, 10% to 30% of 1/3 coke coal, 10% to 35% of fat coal, 10% to 20% of lean-reducing coal, and 0% to 15% of anthracite coal;

in the step f, the quality indexes of the gasified coke are as follows: reactive CRI>50% crushing strength M₂₅Greater than 80% and abrasion resistance M₁₀<12% volatile component V<3％。