Coal gasification slag-based composite material and preparation method thereof

Abstract

The invention discloses a coal gasification slag-based composite material and a preparation method thereof, and relates to the technical field of composite materials, the coal gasification slag-based composite material comprises the following components in percentage by weight: 40-70% of coal gasification slag, 7-15% of a polymer, 5-15% of a reinforcing agent, 30-40% of a filling agent and the balance of a metal catalyst, the weight ratio of the metal catalyst is 10-25%, and the metal catalyst is one or more of manganese oxide, iron oxide and copper oxide. The coal gasification slag-based composite material provided by the invention can be used for soil remediation, and the internal hierarchical coal gasification slag matrix material has the characteristics of good adsorbability and high strength, so that external air can conveniently enter the soil when the coal gasification slag-based composite material is used in the soil, and therefore, moisture and air circulation can be promoted; various pollutants in the soil can be quickly adsorbed and catalyzed by matching with the contact layers on the two sides, so that the soil remediation speed can be greatly increased.

Description

Technical Field

[0001] The invention relates to the technical field of composite materials, and in particular to a coal gasification slag-based composite material and a preparation method thereof. Background Art

[0002] Coal gasification slag is the slag produced during the coal gasification process, usually a solid residue generated by gasifying coal. Coal gasification slag cannot be directly used in cement and concrete due to its high carbon content. In addition, although coal gasification slag has a certain calorific value, it does not meet the boiler combustion requirements due to its high moisture content, many impurities and low carbon content, and cannot be directly used for blending in large quantities. At present, the utilization rate of coal gasification slag is low, the processing cost is high, and there is an environmental threat. Stockpiling and landfilling are still the main disposal methods for coal gasification slag, but this not only occupies a large amount of land, but may also cause pollution to the environment and ecology. However, the residual carbon and relatively rich silicon, aluminum and iron resources in coal gasification slag have potential utilization value. At present, some research has been devoted to the resource utilization of coal gasification slag, such as using it in the preparation of cement and concrete, brick making, adsorption materials and agriculture.

[0003] Among them, it can be used in improving soil through adsorption effect, but relying solely on coal gasification slag itself cannot produce a good effect, and most of the pollutants in the soil cannot be treated, so the function needs to be enriched and improved. Summary of the invention

[0004] The purpose of the present invention is to provide a coal gasification slag-based composite material and a preparation method thereof, which solves the problem that coal gasification slag itself cannot produce a good effect and cannot treat most pollutants in the soil, so the function needs to be enriched and improved.

[0005] The present invention solves the above technical problems through the following technical scheme. The present invention includes coal gasification slag, polymer, reinforcing agent, filler and metal catalyst. The weight proportion of the coal gasification slag is 40-70%, the weight proportion of the polymer is 7-15%, the weight proportion of the reinforcing agent is 5-15%, the weight proportion of the filler is 30-40%, and the weight proportion of the metal catalyst is 10-25%.

[0006] Preferably, the metal catalyst is one or more of manganese oxide, iron oxide, copper oxide, and aluminum oxide, and the metal catalyst is used to assist soil remediation.

[0007] Preferably, the polymer is one of polyethylene, polypropylene or epoxy resin, and the polymer is used to improve the toughness and strength of the composite material.

[0008] Preferably, the reinforcing agent is glass fiber or ceramic fiber, and the reinforcing agent is used to improve the mechanical strength of the composite material.

[0009] Preferably, the filler includes quartz powder and coconut shreds, and the filler is used to adjust the density of the composite material.

[0010] A method for preparing a coal gasification slag-based composite material comprises the following steps: S1. Raw material preparation: prepare coal gasification slag, polymer, reinforcing agent, filler and metal catalyst in proportion; S2. Preparation of layered coal gasification slag matrix material: 80% of the prepared polymer by weight is placed in a mixing container, and the mixing container is heated to 100° C. by a heating device, and when the polymer is completely melted, a reinforcing agent, a filler and 80% of the coal gasification slag by weight are placed in the mixing container, and the materials are mixed by a stirrer, and then the mixed material is passed into an extrusion molding machine, and extruded into the layered coal gasification slag matrix material by the extrusion molding machine; S3. Surface treatment of coal gasification slag matrix: put the metal catalyst, the remaining coal gasification slag and the remaining polymer into a mixing container, heat them to 100°C by a heating device, use a stirrer to mix the materials, and then pass the mixed materials into an extrusion molding machine, extrude them into a hierarchical contact layer of the same size as the hierarchical coal gasification slag matrix material, and extrude them to both sides of the hierarchical coal gasification slag matrix material, and obtain the coal gasification slag-based composite material after cooling and molding.

[0011] Compared with the prior art, the beneficial effects of the present invention are: The coal gasification slag-based composite material provided by the present invention can be used for soil remediation. The internal layered coal gasification slag matrix material has the characteristics of good adsorption and high strength. When used in the soil, it can facilitate the entry of external air into the soil, thereby promoting the circulation of water and air. Cooperating with the contact layers on both sides, it can quickly adsorb and catalyze various pollutants in the soil, thereby greatly improving the soil remediation speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a view of the state of the coal gasification slag-based composite material of the present invention being used in soil. DETAILED DESCRIPTION

[0013] The above and other technical features and advantages of the present invention are described in more detail below in conjunction with the accompanying drawings.

[0014] Embodiment 1 The present embodiment provides a technical solution: a coal gasification slag-based composite material, comprising coal gasification slag, a polymer, a reinforcing agent, a filler and a metal catalyst, wherein the weight of the coal gasification slag is 50%, the weight of the polymer is 5%, the weight of the reinforcing agent is 5%, the weight of the filler is 30%, and the weight of the metal catalyst is 10-25%.

[0015] Coal gasification slag, polymer, reinforcing agent and filler can form a coal gasification slag matrix material, which has the characteristics of good adsorption and high strength.

[0016] In a specific implementation, the metal catalyst is manganese oxide, which is used to assist soil remediation. Manganese oxide is an effective oxidant that can be used to remove organic pollutants and nitrogen oxides (such as nitrate removal) in the soil. At the same time, manganese in the soil also promotes plant growth.

[0017] Furthermore, the polymer is polyethylene, and the polymer is used to improve the toughness and strength of the composite material.

[0018] Furthermore, the reinforcing agent is glass fiber, and the reinforcing agent is used to improve the mechanical strength of the composite material.

[0019] Furthermore, the filler includes quartz powder and coconut shreds, and the filler is used to adjust the density of the composite material.

[0020] The method for preparing the coal gasification slag-based composite material comprises the following steps: S1. Raw material preparation: prepare coal gasification slag, polymer, reinforcing agent, filler and manganese oxide in proportion; S2. Preparation of layered coal gasification slag matrix material: 80% of the prepared polymer by weight is placed in a mixing container, and the mixing container is heated to 100° C. by a heating device, and when the polymer is completely melted, a reinforcing agent, a filler and 80% of the coal gasification slag by weight are placed in the mixing container, and the materials are mixed by a stirrer, and then the mixed material is passed into an extrusion molding machine, and extruded into the layered coal gasification slag matrix material by the extrusion molding machine; S3. Surface treatment of coal gasification slag matrix: manganese oxide, remaining coal gasification slag and remaining polymer are put into a mixing container, heated to 100°C by a heating device, and mixed with a stirrer. The mixed material is then passed into an extrusion molding machine, and extruded into a contact layer of the same size as the layered coal gasification slag matrix material, and then extruded to both sides of the layered coal gasification slag matrix material. After cooling and molding, the coal gasification slag-based composite material can be obtained.

[0021] In this embodiment, the coconut shreds in the coal gasification slag and filler can make the layered coal gasification slag matrix material become a material with good air permeability. Figure 1As shown, the gasification slag-based composite material is vertically placed on the ground and buried in the soil. The top of the gasification slag-based composite material is connected to the outside world, so that the outside air can enter the soil conveniently, thereby promoting the circulation of water and air. The contact layers on both sides can directly contact the soil. The manganese oxide therein can remove organic pollutants and nitrogen oxides in the soil. Furthermore, since the gasification slag-based composite material can improve the air circulation in the soil, the oxygen content of the soil can be increased, thereby accelerating the reaction rate to a certain extent.

[0022] Embodiment 2 The present embodiment provides a technical solution: a coal gasification slag-based composite material, comprising coal gasification slag, a polymer, a reinforcing agent, a filler and a metal catalyst, wherein the weight of the coal gasification slag is 50%, the weight of the polymer is 5%, the weight of the reinforcing agent is 5%, the weight of the filler is 30%, and the weight of the metal catalyst is 10-25%.

[0023] In a specific implementation, the metal catalyst is iron oxide, which can remove heavy metal ions such as lead and cadmium, and help improve the heavy metal pollution of the soil through adsorption and precipitation reactions.

[0024] Furthermore, the polymer is polyethylene, and the polymer is used to improve the toughness and strength of the composite material.

[0025] Furthermore, the reinforcing agent is glass fiber, and the reinforcing agent is used to improve the mechanical strength of the composite material.

[0026] Furthermore, the filler includes quartz powder and coconut shreds, and the filler is used to adjust the density of the composite material.

[0027] The method for preparing the coal gasification slag-based composite material comprises the following steps: S1. Raw material preparation: prepare coal gasification slag, polymer, reinforcing agent, filler and iron oxide in proportion; S2. Preparation of layered coal gasification slag matrix material: 80% of the prepared polymer by weight is placed in a mixing container, and the mixing container is heated to 100° C. by a heating device, and when the polymer is completely melted, a reinforcing agent, a filler and 80% of the coal gasification slag by weight are placed in the mixing container, and the materials are mixed by a stirrer, and then the mixed material is passed into an extrusion molding machine, and extruded into the layered coal gasification slag matrix material by the extrusion molding machine; S3. Surface treatment of coal gasification slag matrix: iron oxide, remaining coal gasification slag and remaining polymer are put into a mixing container, heated to 100°C by a heating device, and mixed with a stirrer. The mixed material is then passed into an extrusion molding machine, and extruded into a contact layer of a hierarchical shape having the same size as the hierarchical coal gasification slag matrix material, and then extruded to both sides of the hierarchical coal gasification slag matrix material. After cooling and molding, the coal gasification slag-based composite material can be obtained.

[0028] In this embodiment, the coconut shreds in the coal gasification slag and filler can make the layered coal gasification slag matrix material become a material with good air permeability. Figure 1 As shown, the gasification slag-based composite material is vertically placed on the ground and buried in the soil. The top of the gasification slag-based composite material is connected to the outside world, so that the outside air can enter the soil conveniently, thereby promoting the circulation of water and air. The contact layers on both sides can directly contact the soil. The iron oxides therein can remove heavy metal ions such as lead and cadmium, and help improve the heavy metal pollution of the soil through adsorption and precipitation reactions. In addition, since the gasification slag-based composite material can improve the air circulation in the soil, it can increase the oxygen content of the soil, thereby accelerating the reaction speed to a certain extent.

[0029] Embodiment 3 The present embodiment provides a technical solution: a coal gasification slag-based composite material, comprising coal gasification slag, a polymer, a reinforcing agent, a filler and a metal catalyst, wherein the weight of the coal gasification slag is 50%, the weight of the polymer is 5%, the weight of the reinforcing agent is 5%, the weight of the filler is 30%, and the weight of the metal catalyst is 10-25%.

[0030] In a specific implementation, the metal catalyst is copper oxide, which has a strong oxidizing ability for organic pollutants such as organophosphorus and carbamates, and can therefore effectively degrade pollutants in the soil, especially organic compounds such as pesticides.

[0031] Furthermore, the polymer is polyethylene, and the polymer is used to improve the toughness and strength of the composite material.

[0032] Furthermore, the reinforcing agent is glass fiber, and the reinforcing agent is used to improve the mechanical strength of the composite material.

[0033] Furthermore, the filler includes quartz powder and coconut shreds, and the filler is used to adjust the density of the composite material.

[0034] The method for preparing the coal gasification slag-based composite material comprises the following steps: S1. Raw material preparation: prepare coal gasification slag, polymer, reinforcing agent, filler and copper oxide in proportion; S2. Preparation of layered coal gasification slag matrix material: 80% of the prepared polymer by weight is placed in a mixing container, and the mixing container is heated to 100° C. by a heating device, and when the polymer is completely melted, a reinforcing agent, a filler and 80% of the coal gasification slag by weight are placed in the mixing container, and the materials are mixed by a stirrer, and then the mixed material is passed into an extrusion molding machine, and extruded into the layered coal gasification slag matrix material by the extrusion molding machine; S3. Surface treatment of coal gasification slag matrix: copper oxide, remaining coal gasification slag and remaining polymer are put into a mixing container, heated to 100°C by a heating device, mixed with a stirrer, and then passed into an extrusion molding machine, extruded into a contact layer of a hierarchical shape with the same size as the hierarchical coal gasification slag matrix material, and extruded to both sides of the hierarchical coal gasification slag matrix material, and then cooled and molded to obtain a coal gasification slag-based composite material.

[0035] In this embodiment, the coconut shreds in the coal gasification slag and filler can make the layered coal gasification slag matrix material become a material with good air permeability. Figure 1 As shown, the coal gasification slag-based composite material is vertically placed on the ground and buried in the soil. The top of the coal gasification slag-based composite material is connected to the outside world, so it is convenient for external air to enter the soil, thereby promoting the circulation of water and air. The contact layers on both sides can be in direct contact with the soil. The copper oxide therein has a strong oxidation ability for organic pollutants such as organic phosphorus and carbamates, so it can effectively degrade pollutants in the soil, especially organic compounds such as pesticides. In addition, since the coal gasification slag-based composite material can improve the air circulation in the soil, it can increase the oxygen content of the soil, thereby accelerating the reaction rate to a certain extent.

[0036] Embodiment 4 The present embodiment provides a technical solution: a coal gasification slag-based composite material, comprising coal gasification slag, a polymer, a reinforcing agent, a filler and a metal catalyst, wherein the weight of the coal gasification slag is 50%, the weight of the polymer is 5%, the weight of the reinforcing agent is 5%, the weight of the filler is 30%, and the weight of the metal catalyst is 10-25%.

[0037] In a specific implementation, the metal catalyst is aluminum oxide, which can adsorb and remove polluting metal ions such as lead and hexavalent chromium, thereby improving soil quality.

[0038] Furthermore, the polymer is polyethylene, and the polymer is used to improve the toughness and strength of the composite material.

[0039] Furthermore, the reinforcing agent is glass fiber, and the reinforcing agent is used to improve the mechanical strength of the composite material.

[0040] Furthermore, the filler includes quartz powder and coconut shreds, and the filler is used to adjust the density of the composite material.

[0041] The method for preparing the coal gasification slag-based composite material comprises the following steps: S1. Raw material preparation: prepare coal gasification slag, polymer, reinforcing agent, filler and aluminum oxide in proportion; S2. Preparation of layered coal gasification slag matrix material: 80% of the prepared polymer by weight is placed in a mixing container, and the mixing container is heated to 100° C. by a heating device, and when the polymer is completely melted, a reinforcing agent, a filler and 80% of the coal gasification slag by weight are placed in the mixing container, and the materials are mixed by a stirrer, and then the mixed material is passed into an extrusion molding machine, and extruded into the layered coal gasification slag matrix material by the extrusion molding machine; S3. Surface treatment of coal gasification slag matrix: aluminum oxide, remaining coal gasification slag and remaining polymer are put into a mixing container, heated to 100°C by a heating device, mixed with a stirrer, and then passed into an extrusion molding machine, extruded into a contact layer of the same size as the layered coal gasification slag matrix material, and extruded to both sides of the layered coal gasification slag matrix material, and then cooled and molded to obtain a coal gasification slag-based composite material.

[0042] In this embodiment, the coconut shreds in the coal gasification slag and filler can make the layered coal gasification slag matrix material become a material with good air permeability. Figure 1 As shown, the gasification slag-based composite material is vertically placed on the ground and buried in the soil. The top of the gasification slag-based composite material is connected to the outside world, so that the outside air can enter the soil conveniently, thereby promoting the circulation of water and air. The contact layers on both sides can directly contact the soil. The aluminum oxide therein can adsorb and remove polluting metal ions such as lead and hexavalent chromium, thereby improving the soil quality. In addition, since the gasification slag-based composite material can improve the air circulation in the soil, the oxygen content of the soil can be increased, thereby accelerating the reaction speed to a certain extent.

[0043] The above are only preferred embodiments of the present invention, which are only illustrative and not restrictive. Those skilled in the art understand that many changes, modifications, and even equivalences may be made to the present invention within the spirit and scope defined by the claims, but all of them will fall within the scope of protection of the present invention.

Claims

1. A coal gasification slag-based composite material, characterized in that: It comprises coal gasification slag, polymer, reinforcing agent, filler and metal catalyst, wherein the weight of the coal gasification slag is 40-70%, the weight of the polymer is 7-15%, the weight of the reinforcing agent is 5-15%, the weight of the filler is 30-40%, and the weight of the metal catalyst is 10-25%.

2. A coal gasification slag-based composite material according to claim 1, characterized in that: The metal catalyst is one or more of manganese oxide, iron oxide, copper oxide and aluminum oxide, and the metal catalyst is used to assist soil remediation.

3. A coal gasification slag-based composite material according to claim 2, characterized in that: The polymer is one of polyethylene, polypropylene or epoxy resin, and the polymer is used to improve the toughness and strength of the composite material.

4. A coal gasification slag-based composite material according to claim 3, characterized in that: The reinforcing agent is glass fiber or ceramic fiber, and the reinforcing agent is used to improve the mechanical strength of the composite material.

5. The coal gasification slag-based composite material according to claim 4, characterized in that: The filler comprises quartz powder and coconut shreds, and the filler is used for adjusting the density of the composite material.

6. A method for preparing a coal gasification slag-based composite material, characterized in that: The preparation method is applicable to the coal gasification slag-based composite material according to any one of claims 1 to 5, comprising the following steps: S1. Raw material preparation: prepare coal gasification slag, polymer, reinforcing agent, filler and metal catalyst in proportion; S2. Preparation of layered coal gasification slag matrix material: 80% of the prepared polymer by weight is placed in a mixing container, and the mixing container is heated to 100° C. by a heating device, and when the polymer is completely melted, a reinforcing agent, a filler and 80% of the coal gasification slag by weight are placed in the mixing container, and the materials are mixed by a stirrer, and then the mixed material is passed into an extrusion molding machine, and extruded into the layered coal gasification slag matrix material by the extrusion molding machine; S3. Surface treatment of coal gasification slag matrix: put the metal catalyst, the remaining coal gasification slag and the remaining polymer into a mixing container, heat them to 100°C by a heating device, use a stirrer to mix the materials, and then pass the mixed materials into an extrusion molding machine, extrude them into a hierarchical contact layer of the same size as the hierarchical coal gasification slag matrix material, and extrude them to both sides of the hierarchical coal gasification slag matrix material, and obtain the coal gasification slag-based composite material after cooling and molding.

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