Composite binder for manufacturing formed coke from anthracite and preparation method and application thereof

Abstract

The invention discloses a composite binder for manufacturing formed coke from anthracite. The composite binder comprises the following components in percentage by mass: 40-80% of wood tar, 15-40% of waste plastic particles, 3-25% of coal gangue powder and 0.5-3% of a pH regulator. The invention also discloses a preparation method of the composite binder for manufacturing formed coke from anthracite. According to the composite adhesive, the waste plastic particles, the wood tar and the coal gangue powder are adopted as raw materials and belong to waste or renewable resources, full utilization of the waste resources or the renewable resources is achieved, and a beneficial way is provided for comprehensive utilization of the waste resources or the renewable resources; meanwhile, the waste plastic particles, the wood tar and the coal gangue powder are compounded, the wood tar and the waste plastic provide cohesiveness, the coal gangue powder provides skeleton support, the cold strength of the briquette coal is ensured, carbonization shrinkage of the formed coke can be reduced by adding the coal gangue powder after heating carbonization, the heat strength of the formed coke is ensured, and industrial requirements can be met.

Description

Technical Field

[0001] This invention belongs to the field of coal forming technology, specifically relating to a composite binder for manufacturing shaped coke from anthracite, its preparation method, and its application. Background Technology

[0002] Anthracite is the most coal-graded coal, characterized by low ash content, high carbon content, and high calorific value. It burns without smoke, reducing pollutant emissions. If abundant anthracite reserves could partially or completely replace scarce coking coal in coking, it would significantly alleviate dependence on coking coal, ensuring raw material security for basic industries such as steel and casting, and holding significant national resource strategic importance. Using anthracite as the main raw material, adding binders, and cold-pressing to produce shaped coke not only expands coking coal resources but also opens up a rational and effective way to utilize the large stockpiles of anthracite pulverized coal in my country.

[0003] In traditional coking coal production, thermal decomposition occurs during heating, producing a plastic, gelatinous substance. This substance, like glue, wets and binds surrounding coal particles together, filling the pores and giving the coke a dense structure and high strength. Therefore, no binder is needed when making briquettes. However, anthracite is a purely inert substance that produces almost no gelatinous substance during heating and has no binding properties. Therefore, binders must be added when using anthracite to prepare briquettes.

[0004] Existing traditional binders used in the preparation of anthracite briquettes mainly include coal tar pitch, as well as inorganic, organic, and composite binders. Among these, traditional binders like coal tar pitch have strong adhesion, high coking value, and produce briquettes with high mechanical strength, making them commonly used briquette binders. However, during the preparation process, coal tar pitch undergoes cracking and condensation reactions, producing large amounts of toxic substances that harm the environment and human health. Furthermore, its limited availability restricts its further development. Organic binders such as starch and lignin sulfonates, as natural organic materials, have the advantage of being environmentally friendly, but they suffer from low residual carbon content and low briquette strength. Inorganic binders such as cement, water glass, and clay have good cold strength and adhesion, but they introduce a large amount of ash, leading to a decrease in the fixed carbon content and calorific value of the briquettes, thus limiting their application range.

[0005] Therefore, there is an urgent need to develop a new type of composite binder with excellent performance and low cost, and to use this binder to manufacture briquetted coal from anthracite powder. Summary of the Invention

[0006] This invention aims to at least partially solve one of the technical problems in related technologies. Therefore, the main objective of this invention is to provide a composite binder for anthracite coke production and its preparation method, which combines good performance with low cost.

[0007] The present invention also provides the application of the composite binder in the manufacture of shaped coke from anthracite powder.

[0008] The objective of this invention is achieved through the following technical solution: In a first aspect, the present invention provides a composite binder for anthracite coke manufacturing, comprising waste plastic particles, wood tar, coal gangue powder and pH adjuster.

[0009] In some specific embodiments, the product comprises the following components by weight percentage: 40-80% wood tar, 15-40% waste plastic pellets, 3-25% coal gangue powder, and 0.5-3% pH adjuster.

[0010] Furthermore, by weight percentage, it includes the following components: 50-70% wood tar, 20-35% waste plastic pellets, 5-15% coal gangue powder, and 0.5-2% pH adjuster.

[0011] In some specific embodiments, 0.5-2% borax is also included by weight percentage.

[0012] In some specific embodiments, the waste plastic particles include one or more of polyethylene, polypropylene, and polyethylene terephthalate.

[0013] In some specific embodiments, the wood tar is tar produced during the dry distillation of wood or the pyrolysis of biomass, which is subjected to static dehydration pretreatment to reduce its moisture content to less than 15%, and then filtered through an 80-200 mesh sieve.

[0014] In some specific embodiments, the pH adjuster is one or a mixture of calcium oxide and sodium carbonate.

[0015] Secondly, the present invention also provides a method for preparing a composite binder for anthracite-based coke, comprising the following steps.

[0016] 1) Raw material pretreatment: After cleaning, crushing, and drying the waste plastic, pulverize it to less than 1mm; let the wood tar stand to dehydrate and filter to remove impurities; crush and pulverize the coal gangue to less than 3mm; dry the waste plastic particles and coal gangue powder for later use. 2) Neutralization: Heat the wood tar to 100~120℃, add pH adjuster, and stir for 10~15 minutes; 3) Mixing: Under continuous heating, waste plastic particles are added to the wood tar and stirred continuously until a uniform viscous liquid is formed. Coal gangue powder is added and stirred until uniform. Add the additives to the wood tar and stir thoroughly to disperse, thus obtaining a mixture. 4) Curing: The mixture is cured at 80~100℃ for 0.5-1.5 hours to obtain the composite adhesive.

[0017] Thirdly, the present invention also provides the application of the composite binder for anthracite coke manufacturing in the manufacture of anthracite powder coke.

[0018] In some specific embodiments, the application method includes the following steps: 1) Mixing: Mix the anthracite powder with the composite binder at a weight ratio of 100:5-20 at 60-80°C. 2) Molding: The mixed mixture is fed into a molding machine and pressed at a temperature of 100~160℃ to 25~50MPa. After molding, it is dried and cooled to obtain coal briquettes. 3) Carbonization: The coal briquettes are placed in a carbonization furnace and heated to 850-1050℃ at a rate of 1-6℃ / min, held at that temperature for 30-90min, and then cooled to obtain coke briquettes.

[0019] Compared with the prior art, the present invention has at least the following advantages: 1) The composite binder for manufacturing anthracite briquettes provided by this invention combines waste plastic particles, wood tar, and coal gangue powder. The wood tar and waste plastic particles provide adhesion, while the coal gangue powder provides skeletal support, ensuring the cold strength of the briquettes. After heating and carbonization, the addition of coal gangue powder can reduce the carbonization shrinkage of the briquettes, ensuring the thermal strength of the briquettes and meeting industrial requirements.

[0020] 2) The composite binder for anthracite coke manufacturing provided by this invention uses waste plastic particles, wood tar and coal gangue powder as raw materials, all of which are waste or renewable resources, realizing the full utilization of waste or renewable resources and providing a beneficial way for their comprehensive utilization. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to specific embodiments. The following embodiments are merely descriptive and not limiting, and should not be used to limit the scope of protection of the present invention.

[0022] When a quantity, concentration, or other value or parameter is described as a range, preferred range, or preferred upper and lower limits, it should be understood that it is equivalent to specifically disclosing any range by combining any pair of upper or preferred values ​​with any lower or preferred values, regardless of whether the range is specifically disclosed. Unless otherwise stated, the numerical range values ​​listed herein include the endpoints of the range and all integers and fractions within that range.

[0023] Unless otherwise stated, all percentages, parts, ratios, etc. in this document are by weight.

[0024] The materials, methods, and embodiments described herein are exemplary and should not be construed as limiting unless otherwise stated.

[0025] In the following embodiments, the waste plastic particles are made by washing, crushing, drying, and then pulverizing the waste plastic to less than 1 mm; the wood tar is tar produced by the dry distillation of wood or the pyrolysis of biomass, which is pretreated by static dehydration to reduce its moisture content to less than 15%, and then filtered through a 100-mesh sieve to remove impurities before use; the coal gangue is crushed and pulverized to less than 3 mm; and the waste plastic particles and coal gangue powder are dried at 80°C for 2 hours.

[0026] The industrial analysis results of the anthracite pulverized coal and coal gangue are shown in Tables 1 and 2, respectively: Table 1. Industrial Analysis Results of Anthracite Table 2. Industrial analysis results of coal gangue Example 1 This embodiment provides a method for preparing a composite binder for anthracite shaped coke and its application in the production of shaped coke from anthracite powder, specifically as follows: 1) Preparation method of composite binder for anthracite coke manufacturing Neutralization: Heat the wood tar to 120°C, add the pH adjuster, and stir for 10 minutes. Mixing: Under continuous heating, waste plastic particles are added to the wood tar and stirred continuously until a uniform viscous liquid is formed. Coal gangue powder is added and stirred until uniform. Add the additives to the wood tar and stir thoroughly to disperse, thus obtaining a mixture. Curing: The mixture is cured at 100°C for 1 hour to obtain the composite adhesive.

[0027] The proportions of the components in the composite adhesive are as follows: by mass percentage, wood tar: 52%; Waste PP plastic powder: 25%; Coal gangue powder: 20%; Calcium oxide: 1.5%; Borax: 1.5%; 2) Methods for using composite binders in prefabricated coke Mixing: The anthracite powder (particle size less than 3 mm) and the composite binder prepared in step 1) are placed in a kneading pot at a weight ratio of 100:18 and mixed thoroughly at 80°C. Molding: The mixed mixture is fed into a molding machine and pressed at 140℃ to 40MPa to form briquettes. After molding, the briquettes are dried and cooled to obtain coal briquettes. Carbonization: The coal briquettes are placed in a carbonization furnace and heated to 950°C at a rate of 3°C / min, held at that temperature for 60 minutes, and then cooled to obtain coke briquettes.

[0028] Example 2 This embodiment provides a method for preparing a composite binder for anthracite shaped coke and its application in the production of shaped coke from anthracite powder, specifically as follows: 1) Preparation method of composite binder for anthracite coke manufacturing Neutralization: Heat the wood tar to 100°C, add a pH adjuster, and stir for 15 minutes. Mixing: Under continuous heating, waste plastic particles are added to the wood tar and stirred continuously until a uniform viscous liquid is formed. Coal gangue powder is added and stirred until uniform. Add the additives to the wood tar and stir thoroughly to disperse, thus obtaining a mixture. Curing: The mixture is cured at 80°C for 1.5 hours to obtain the composite adhesive.

[0029] The proportions of the components in the composite adhesive are as follows: by mass percentage, wood tar: 62%; Waste PP plastic powder: 25%; Coal gangue powder: 10%; Calcium oxide: 1.5%; Borax: 1.5%; 2) Methods for using composite binders in prefabricated coke Mixing: The anthracite powder (particle size less than 3 mm) and the composite binder prepared in step 1) are placed in a kneading pot at a weight ratio of 100:18 and mixed thoroughly at 80°C. Molding: The mixed mixture is fed into a molding machine and pressed at 140℃ to 40MPa to form briquettes. After molding, the briquettes are dried and cooled to obtain coal briquettes. Carbonization: The coal briquettes are placed in a carbonization furnace and heated to 950°C at a rate of 3°C / min, held at that temperature for 60 minutes, and then cooled to obtain coke briquettes.

[0030] Example 3 This embodiment provides a method for preparing a composite binder for anthracite coal manufacturing coke, which is basically the same as that in Embodiment 1, except that the waste plastic particles are waste PE particles. The application method of the composite binder in the manufacturing of shaped coke from anthracite powder is the same as in Example 1.

[0031] Example 4 This embodiment provides a method for preparing a composite binder for manufacturing shaped coke from anthracite, which is basically the same as that in Embodiment 2, except that the waste plastic particles are waste PE particles; the application method of the composite binder in manufacturing shaped coke from anthracite powder is the same as that in Embodiment 2.

[0032] Example 5 This embodiment provides a method for preparing a composite binder for manufacturing shaped coke from anthracite, which is basically the same as that in Example 1, except that the waste plastic particles are waste PET particles; the application method of the composite binder in manufacturing shaped coke from anthracite powder is the same as that in Example 1.

[0033] Example 6 This embodiment provides a method for preparing a composite binder for manufacturing shaped coke from anthracite, which is basically the same as that in Embodiment 2, except that the waste plastic particles are waste PET particles; the application method of the composite binder in manufacturing shaped coke from anthracite powder is the same as that in Embodiment 2.

[0034] Comparative Example 1 This comparative example provides a method for preparing a composite binder for anthracite-based coke, which is basically the same as that in Example 1, except that it contains coal gangue powder and replaces wood tar and waste plastic particles with an equal amount of coal gangue.

[0035] Comparative Example 2 This comparative example provides a method for preparing a composite binder for anthracite-based coke, which is basically the same as that in Example 1, except that it contains wood tar and replaces coal gangue and waste plastic particles with an equal amount of wood tar.

[0036] Comparative Example 3 This comparative example provides a method for preparing a composite binder for anthracite-based coke, which is basically the same as that in Example 1, except that it contains waste plastic particles, and replaces coal gangue and wood tar with an equal amount of waste plastic particles.

[0037] The present invention conducted performance tests on the coke molds prepared in Examples 1-6 and Comparative Examples 1-3, and the results are shown in Table 3: Table 3 Performance test results of the coke in each embodiment and comparative example As shown in Table 3, the performance test data indicates that the briquettes and cokes prepared by blending wood tar, waste plastics, and coal gangue with anthracite exhibit good strength, meeting the needs of most industries. The absence of coal gangue powder significantly reduces the strength of the coke after the reaction. Since coal gangue powder, being an inert material, can still serve as the skeletal structure of the coke after coal briquettes are formed, imparting a certain strength, it plays a crucial role. Using only coal gangue powder results in poorly bound coke, as its binding properties are very weak, leading to coke that is almost impossible to form or lacks strength after forming. While wood tar and waste plastics possess some binding properties, wood tar tends to provide the carbonized skeleton for thermal strength, while waste plastics, with their low coking rate after carbonization, tend to provide cold strength. Using only one of these as a binder cannot simultaneously achieve both thermal and cold strength in the coke, resulting in a final decrease in strength. By utilizing wood tar, waste plastics, and coal gangue powder as binders, the synergistic effect of these three components gives the shaped coke good strength. The shaped coke prepared by this patent has low ash content and good strength, and can partially replace shaped coke prepared from traditional coking coal, thus broadening the sources of coking coal.

[0038] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A composite binder for anthracite coke manufacturing, characterized in that, This includes waste plastic pellets, wood tar, coal gangue powder, and pH adjusters.

2. The composite binder for anthracite coke production according to claim 1, characterized in that, It comprises the following components by weight percentage: 40-80% wood tar, 15-40% waste plastic pellets, 3-25% coal gangue powder, and 0.5-3% pH adjuster.

3. The composite binder for anthracite coke production according to claim 2, characterized in that, It comprises the following components by weight percentage: 50-70% wood tar, 20-35% waste plastic pellets, 5-15% coal gangue powder, and 0.5-2% pH adjuster.

4. The composite binder for anthracite coke production according to claim 2 or 3, characterized in that, It also includes 0.5-2% borax by weight percentage.

5. The composite binder for anthracite coke production according to claim 1, characterized in that, The waste plastic particles include one or more of polyethylene, polypropylene, and polyethylene terephthalate.

6. The composite binder for anthracite coke production according to claim 1, characterized in that, The wood tar is tar produced during the dry distillation of wood or the pyrolysis of biomass. It is pretreated by static dehydration to reduce its moisture content to less than 15% and then filtered through an 80-200 mesh sieve.

7. The composite binder for anthracite coke production according to claim 1, characterized in that, The pH adjuster is one or a mixture of calcium oxide and sodium carbonate.

8. A method for preparing a composite binder for anthracite coke manufacturing according to any one of claims 1-7, characterized in that, Includes the following steps: 1) Raw material pretreatment: After cleaning, crushing, and drying the waste plastic, pulverize it to less than 1mm; let the wood tar stand to dehydrate and filter to remove impurities; crush and pulverize the coal gangue to less than 3mm; dry the waste plastic particles and coal gangue powder for later use. 2) Neutralization: Heat the wood tar to 100~120℃, add pH adjuster, and stir for 10~15 minutes; 3) Mixing: Under continuous heating, waste plastic particles are added to the wood tar and stirred continuously until a uniform viscous liquid is formed. Coal gangue powder is added and stirred until uniform. Add the additives to the wood tar and stir thoroughly to disperse, thus obtaining a mixture. 4) Curing: The mixture is cured at 80~100℃ for 0.5-1.5 hours to obtain the composite adhesive.

9. The application of a composite binder for manufacturing shaped coke from anthracite according to any one of claims 1-7 in the manufacturing of shaped coke from anthracite powder.

10. The application according to claim 9, characterized in that, Includes the following steps: 1) Mixing: Mix the anthracite powder with the composite binder at a weight ratio of 100:5-20 at 60-80°C. 2) Molding: The mixed mixture is fed into a molding machine and pressed at a temperature of 100~160℃ to 25~50MPa. After molding, it is dried and cooled to obtain coal briquettes. 3) Carbonization: The coal briquettes are placed in a carbonization furnace and heated to 850-1050℃ at a rate of 1-6℃ / min, held at that temperature for 30-90min, and then cooled to obtain coke briquettes.

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