A method for promoting the coagulation and filling of multi-component powder solid waste by medical waste cotton products

Abstract

The present invention relates to the technical field of waste treatment in underground mining, and provides a method for promoting the coagulation and filling of multi-component powder solid waste with medical waste cotton products. The materials used include the following components: multi-component powder solid waste, and certain synergistic hydration reactions occur among the materials of the multi-component powder solid waste to produce a gel; medical waste cotton products, which rely on their own porous structures to attract small-particle-size powder substances in the multi-component powder solid waste and fill the inside of the multi-component powder solid waste for aggregation; moreover, the medical waste cotton products are attracted by the negative charges on the surfaces of the small-particle-size powder substances; so that the medical waste cotton products are coagulated with the small-particle-size powder substances in the multi-component powder solid waste; cement products, which promote the coagulation of the powder solid waste. The beneficial effects are as follows: By selecting a new type of filling material, the amount of cement used is reduced while ensuring the compressive strength, which not only solves the problem of environmental pollution caused by multi-component solid waste, but also reduces the filling cost.

Description

Technical Field

[0001] The present invention relates to the technical field of waste treatment in underground mining, and particularly to a method for promoting the coagulation and filling of multi-component powder solid waste with medical waste cotton products. Background Art

[0002] The filling of multi-component powder solid waste is to process coal gangue grinding powder, fly ash, carbide slag, loess, desulfurized gypsum, etc. into a paste-like slurry that does not require dehydration treatment, and use gravity or a filling pump to pressurize and timely transport it to the goaf underground through a pipeline to form a paste filling body, effectively controlling surface subsidence. The realization of the filling mining effect depends on the filling material ratio strength, filling process selection, etc., and is also controlled by various factors such as mining geological conditions.

[0003] Strengthening the effective treatment of medical cotton products is of extremely important significance in environmental protection.

[0004] In view of this, the present invention is proposed. Summary of the Invention

[0005] The purpose of the present invention is to provide a method for promoting the coagulation and filling of multi-component powder solid waste with medical waste cotton products to solve the technical problems existing in the prior art.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is: a method for promoting the coagulation and filling of multi-component powder solid waste with medical waste cotton products, including: the materials used include the following components:

[0007] Multi-component powder solid waste, the multi-component powder solid waste serves as the aggregate in the filling paste, and certain synergistic hydration reactions occur among the materials of the multi-component powder solid waste to produce gel;

[0008] Medical waste cotton products, the medical waste cotton products rely on their own porous structure to attract the small-particle-size powder substances in the multi-component powder solid waste and fill and coagulate inside the multi-component powder solid waste; moreover, the medical waste cotton products are attracted by the negative charges on the surface of the small-particle-size powder substances; through the above two methods, the medical waste cotton products and the small-particle-size powder substances in the multi-component powder solid waste are coagulated;

[0009] Cement products, the cement products promote the coagulation of the powder solid waste.

[0010] In an optional embodiment, all the multi-component powder solid waste is ground to less than 100 mesh.

[0011] In an optional embodiment, the multi-component powder solid waste is composed of one or more of coal gangue grinding powder, fly ash, carbide slag, loess, and desulfurized gypsum.

[0012] In an alternative embodiment, the medical waste cotton products include medical cotton balls, gauze, and adhesive tapes.

[0013] In an alternative embodiment, the cement product is one of 425 Portland cement and sulfoaluminate cement.

[0014] In an alternative embodiment, the following steps are included:

[0015] S1: Select one or more of coal gangue grinding powder, fly ash, carbide slag, loess, and desulfurized gypsum as the raw materials for the multi-component powder solid waste;

[0016] S2: Mix the selected raw materials of the multi-component powder solid waste with the cement product for 0.3 - 0.5 h until evenly mixed to prepare the filling raw materials for the required multi-component powder solid waste;

[0017] S3: Prepare multiple slurries by mixing the filling raw materials and water in different ratios, and ensure that there is no segregation of solids and liquids; measure the fluidity of each slurry under different ratio conditions to obtain the maximum fluidity among the slurries, and obtain the ratio of the filling raw materials to water corresponding to the slurry with the maximum fluidity. The selected slurries are used to prepare compressive strength standard specimens for compressive tests to measure the compressive strength;

[0018] S4: Immerse the medical waste cotton products in alcohol with a volume fraction of 75% and stir for disinfection and sterilization;

[0019] S5: Add the medical waste cotton products prepared in step S4 to the filling raw materials and gradually reduce the usage amount of the cement product in S2;

[0020] S6: Prepare multiple slurries according to the method and ratio in S3, re-measure the fluidity of each slurry, select the slurries with a fluidity higher than or consistent with the fluidity of the slurry with the maximum fluidity obtained in S3, continue to prepare compressive strength standard specimens, measure the compressive strength of each filling specimen, and obtain the best new filling material;

[0021] S7: Continue to reduce the usage amount of the cement product and increase the usage amount of the medical waste cotton products, and repeat the ratio preparation to obtain slurries with higher fluidity and greater compressive strength after molding.

[0022] In an alternative embodiment, in S4, the gauze and adhesive tapes in the medical waste cotton products need to be broken into small pieces of 5 - 10 mm using a crusher after disinfection; the cotton balls are not broken and are directly used after disinfection.

[0023] In an alternative embodiment, the reduction amount of the cement product should be equal to the addition amount of the medical waste cotton products, and both the reduction amount and the addition amount are mass fractions.

[0024] The beneficial effects of the present invention are as follows:

[0025] The present invention adopts a filling method in which the self - characteristics of medical waste cotton products are used to promote the coagulation of multi - component powder solid waste to reduce the dosage of cement products. By measuring the fluidity of the filling materials of multi - component solid waste without adding medical waste cotton products under different ratios, the fluidity and compressive strength requirements of the filling materials are finally obtained. Then, medical waste cotton products are added to replace part of the cement, and a new filling material ratio that is better than or equal to the original material is selected by measuring the fluidity. Then, the best new filling material is determined through the measurement of the compressive performance. While ensuring the compressive strength, the usage amount of cement is reduced. This filling method not only solves the problem of environmental pollution caused by multi - component solid waste, but also solves the problem of filling cost, improves the filling economic benefits, and at the same time can solve problems such as goaf caving and surface subsidence, and has wide applicability. Brief Description of the Drawings

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0027] Figure 1 It is a comparison curve graph of the fluidity before and after replacing the cement products provided in an embodiment of the present invention;

[0028] Figure 2 It is a comparison curve graph of the 28 - day compressive strength before and after replacing the cement products in an embodiment of the present invention;

[0029] Figure 3 It is a scanning electron microscope image of the multi - component powder solid waste filling material in an embodiment of the present invention;

[0030] Figure 4 It is a scanning electron microscope image of the new filling material after replacement in an embodiment of the present invention. Detailed Embodiments

[0031] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the following further details the present invention with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0032] It should be noted that when a component is referred to as "fixed to" or "disposed on" another component, it can be directly or indirectly located on that other component. When a component is referred to as "connected to" another component, it can be directly or indirectly connected to that other component. The directions or positions indicated by the terms "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the directions or positions shown in the drawings, and are only for convenience of description and should not be construed as a limitation to the technical solution of the present invention. The terms "first" and "second" are only for convenience of description purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of technical features. The meaning of "a plurality" is two or more, unless otherwise specifically and clearly defined.

[0033] Please refer to the attached Figures 1-4 , the purpose of this embodiment is to provide a method for promoting the coagulation and filling of multiple powder solid wastes by medical waste cotton products. The specific steps of this method are as follows:

[0034] S1: Determine the raw materials of the multiple powder solid waste filling material: Select one or more of coal gangue grinding powder, fly ash, carbide slag, loess, and desulfurized gypsum as the raw materials of the multiple powder solid waste.

[0035] S2: Mix the above raw materials of the multiple powder solid waste (80% by mass fraction) and cement products (20% by mass fraction) for 0.3 - 0.5 h until evenly mixed to prepare the required filling material (medical waste cotton products are not included at this time).

[0036] S3: Determine the ratio of the required filling material to water (water-cement ratio): Make multiple slurries by mixing the above filling material and water in different ratios, and ensure that the solid and liquid do not segregate; then measure the fluidity of each slurry under different ratio conditions, obtain the maximum fluidity among the slurries, and finally obtain the ratio of the filling raw material to water corresponding to the slurry with the maximum fluidity. The water-cement ratios are set to 0.52, 0.54, 0.56, 0.58, 0.60, 0.62, 0.64, 0.66, 0.68, and 0.70 respectively. The slurries obtained by screening are used to prepare compressive strength standard specimens for compressive tests to measure the compressive strength at 28 d.

[0037] S4: Immerse the above medical waste cotton products in alcohol with a volume fraction of 75% and stir for disinfection and sterilization. Among them, gauze and adhesive tape need to be broken into small pieces of 5 - 10 mm using a crusher after disinfection; cotton balls do not need to be broken and can be directly used after disinfection.

[0038] S5: Add the medical waste cotton products prepared in step S4 to the above filling material, and gradually reduce the usage amount of cement products; wherein, the mass percentage of the raw materials of the multi-component powder solid waste remains unchanged at 80%, and the reduction amount (mass fraction) of the cement products should be equal to the addition amount (mass fraction) of the added medical waste cotton products.

[0039] S6: Prepare multiple slurries (containing medical waste cotton products) according to the method and water-cement ratio in step S3, continue to obtain the ratio of the new filling material to water, re-measure the fluidity of each slurry, and screen out the new filling material slurries with a fluidity higher than or consistent with that of the multi-component solid waste filling raw material slurry obtained in step S3 above. Then, prepare compressive strength standard specimens according to step S3, measure the compressive strength of each filling specimen, and obtain the best new filling material.

[0040] S7: Continue to reduce the usage amount of cement products and increase the usage amount of medical waste cotton products, and repeat the proportioning to prepare slurries with higher fluidity and greater compressive strength after molding.

[0041] Compared with the prior art, in this embodiment, a filling method is adopted in which the self-characteristics of medical waste cotton products are used to promote the coagulation of multi-component powder solid waste to reduce the usage amount of cement products (charge attraction and porous structure attraction). By measuring the fluidity of the filling material of multi-component solid waste without adding medical waste cotton products under different proportions, the fluidity and compressive strength requirements of the filling material are finally obtained. Then, medical waste cotton products are added to replace part of the cement, and the ratio of the new filling material superior to or equal to the original material is selected by measuring the fluidity. Then, the best new filling material is determined by measuring the compressive performance, and the usage amount of cement is reduced while ensuring the compressive strength. This filling method not only solves the problem of multi-component solid waste polluting the environment, but also solves the problem of filling cost, improves the filling economic benefits, and at the same time can solve problems such as goaf caving and surface subsidence; it has wide applicability.

[0042] Combined with the attached Figures 1-4 It can be concluded that after replacing a certain proportion of cement with medical waste cotton products, the fluidity and compressive strength of the filling material are improved, which shows that the method proposed in this embodiment is scientific and feasible.

[0043] Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for promoting the condensation and filling of multi-component powder solid waste by medical waste cotton products, characterized in that, The materials used include the following components: Multi-component powder solid waste, which serves as the aggregate in the filling paste. A certain synergistic hydration reaction occurs among the materials of the multi-component powder solid waste, generating gel. Medical waste cotton products. The medical waste cotton products rely on their porous structure to attract the small-particle-size powder substances in the multi-component powder solid waste and fill the inside of the multi-component powder solid waste for agglomeration. Moreover, the medical waste cotton products are attracted by the negative charges on the surface of the small-particle-size powder substances. Through the above two methods, the medical waste cotton products are coagulated with the small-particle-size powder substances in the multi-component powder solid waste. Cement products, which promote the coagulation of the powder solid waste. It includes the following steps: S1: Select one or more of coal gangue grinding powder, fly ash, carbide slag, loess, and desulfurized gypsum as the raw materials of the multi-component powder solid waste. S2: Mix the selected raw materials of the multi-component powder solid waste with the cement products for 0.3 - 0.5 h until evenly mixed to prepare the filling raw materials of the required multi-component powder solid waste. S3: Prepare multiple slurries by mixing the filling raw materials and water in different ratios, and ensure that no segregation occurs between the solid and liquid. Measure the fluidity of each slurry under different ratio conditions to obtain the maximum fluidity among the slurries, and obtain the ratio of the filling raw materials to water corresponding to the slurry with the maximum fluidity. The selected slurries are used to prepare compressive standard specimens for compressive tests to measure the compressive strength. S4: Immerse the medical waste cotton products in alcohol with a volume fraction of 75% and stir for disinfection and sterilization. S5: Add the medical waste cotton products prepared in step S4 to the filling raw materials and gradually reduce the usage amount of the cement products in S2. S6: Prepare multiple slurries according to the method and ratio in S3, re-measure the fluidity of each slurry, select the slurries with fluidity higher than or the same as that of the slurry with the maximum fluidity obtained in S3, continue to prepare compressive standard specimens, measure the compressive strength of each filling specimen, and obtain the filling materials. S7: Continue to reduce the usage amount of the cement products and increase the usage amount of the medical waste cotton products, and repeat the ratio preparation to obtain slurries with higher fluidity and greater compressive strength after molding.

2. The method for promoting the coagulation and filling of multi-component powder solid waste by medical waste cotton products according to claim 1, characterized in that All multi-component powder solid waste is ground to less than 100 mesh.

3. The method for promoting the condensation and filling of multi-component powder solid waste by medical waste cotton products according to claim 2, characterized in that, The multi-component powder solid waste is composed of one or more of coal gangue grinding powder, fly ash, carbide slag, loess, and desulfurized gypsum.

4. The method for promoting the condensation and filling of multi-component powder solid waste by medical waste cotton products according to claim 1, wherein The medical waste cotton products include medical cotton balls, gauze, and adhesive tapes.

5. The method for promoting the condensation and filling of multi-component powder solid waste by medical waste cotton products according to claim 1, characterized in that, The cement products are one of 425 Portland cement and sulphoaluminate cement.

6. The method for promoting the coagulation and filling of multi-component powder solid waste by medical waste cotton products according to claim 1, characterized in that, In S4, the gauze and adhesive tapes in the medical waste cotton products need to be broken into small pieces of 5 - 10 mm using a crusher after disinfection; the cotton balls are not broken and are directly used after disinfection.

7. The method for promoting the condensation filling of multi-component powder solid waste by medical waste cotton products according to claim 1, characterized in that, The reduction amount of the cement products should be equal to the addition amount of the medical waste cotton products, and both the reduction amount and the addition amount are mass fractions.

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