Mine filling material based on cooperation of various solid wastes and preparation method thereof

Abstract

The invention discloses a mine filling material based on cooperation of multiple solid wastes and a preparation method thereof, and belongs to the technical field of mine filling materials. The cement is prepared from the following components in parts by weight: 15 to 35 parts of cement clinker, 8 to 18 parts of fly ash, 5 to 15 parts of desulfurized gypsum, 3 to 9 parts of early strength agent, 30 to 50 parts of coal gangue particles, 10 to 15 parts of stainless steel slag, 8 to 14 parts of raw material steel slag, 20 to 40 parts of corncob, 30 to 55 parts of waste cedar, 25 to 45 parts of waste shell and 18 to 22 parts of alkali activator. Stainless steel slag, raw material steel slag, desulfurized gypsum, coal gangue particles and fly ash are subjected to material excitation by adding an alkali activator, and the stainless steel slag, the raw material steel slag, corncobs, waste cedar trees and waste shells are added into a mine filling material in the prior art. The mine filling material has the advantages that waste discharge of related industries of raw materials can be reduced, waste utilization can be achieved, environment protection can be achieved, the cost is low due to addition of the waste, and the use effect of the mine filling material can be greatly improved.

Description

Technical Field

[0001] This invention relates to the field of mine filling material technology, specifically to a mine filling material based on the synergistic effect of multiple solid wastes and its preparation method. Background Technology

[0002] With the advent of the information age, people have gained a certain understanding of various industries, such as mining. At the same time, people have become more aware of the environmental protection requirements for mining areas, and thus attach greater importance to environmental protection. Furthermore, with the development of mining equipment and technology, environmental damage caused by mining can be greatly reduced. After coal mining, a large amount of underground space and mine shafts are formed. If left unattended, ground subsidence can easily occur over time, damaging the geological structure. Therefore, after the completion of coal mining in an area, the underground space is filled and repaired to prevent ground subsidence and ensure that the mining area can still be used to a certain extent in the future. However, existing mine filling materials still have some drawbacks, such as high cost. The underground space after mining is very large, and existing mine filling materials require a lot of funds for filling and repair. Moreover, existing mine filling materials cannot effectively utilize some waste resources. Therefore, we propose a mine filling material based on the synergistic effect of multiple solid wastes and its preparation method. Summary of the Invention

[0003] The purpose of this invention is to provide a mine backfill material based on the synergistic effect of multiple solid wastes and its preparation method, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a mine backfill material based on the synergistic effect of multiple solid wastes and its preparation method. The formula of the mine backfill material is as follows: cement clinker: 15-35 parts, fly ash: 8-18 parts, desulfurized gypsum: 5-15 parts, early strength agent: 3-9 parts, coal gangue particles: 30-50 parts, stainless steel slag: 10-15 parts, raw steel slag: 8-14 parts, corn cob: 20-40 parts, waste fir: 30-55 parts, waste seashells: 25-45 parts, alkali activator: 18-22 parts.

[0005] Preferred alkaline activators include sodium hydroxide, sodium hexafluoroaluminate, water glass, and diethanolamine.

[0006] Preferred ratio of sodium hydroxide, sodium hexafluoroaluminate, water glass and diethanolamine is sodium hydroxide (5-7): sodium hexafluoroaluminate (3-5): water glass (4-6): diethanolamine (2).

[0007] Preferred: The early strength agent is anhydrous sodium sulfate.

[0008] Preferably, the particle size of the coal gangue is less than 1.5 cm.

[0009] A mine backfill material based on the synergistic effect of multiple solid wastes, the preparation method of which includes the following steps: Step 1: Pre-treat stainless steel slag and raw steel slag materials. Select undisturbed stainless steel slag and raw steel slag with a diameter of 15-35 mm, and perform carbonization treatment on them for 80-160 hours. After carbonization, perform high-temperature drying and grinding and crushing treatment, and the particle size after crushing is 2-3 mm. Step 2: Pre-treat the corn cobs and waste cedar trees. Peel the waste cedar trees and then dry the corn cobs and waste cedar trees at high temperature for 24-30 hours. Step 3: Processing waste shells. The collected waste shells are cleaned and air-dried. After that, they are dried at a high temperature of 110 degrees Celsius for 15-20 hours. After that, the waste shells, corn cobs and waste cedar trees are crushed together. During the crushing process, the stainless steel slag crushed in Step 1 and the raw steel slag are poured into the crushing device together and crushed for 1-3 hours to obtain a mixture. Step 4: Prepare the alkali activator. Select the proportions of sodium hydroxide, sodium hexafluoroaluminate, water glass and diethanolamine, and combine them to prepare the alkali activator. Set aside for later use. Step 5: Pour the mixture obtained in Step 3 into the mixing device, and then pour the cement clinker, fly ash, desulfurized gypsum, and coal gangue particles into the mixing device in sequence. Set the mixing time to 1 hour, and then pour the early strength agent and alkali activator into the mixing device in batches and continue mixing for 20-30 minutes to prepare the mine filling material based on the synergistic effect of multiple solid wastes.

[0010] Compared with existing technologies, the beneficial effects of this invention are as follows: This mine backfill material based on the synergistic effect of multiple solid wastes and its preparation method activates stainless steel slag, raw steel slag, desulfurized gypsum, coal gangue particles, and fly ash by adding an alkaline activator, thereby breaking the silicon monoxide and aluminum monoxide bonds in the material, promoting the rapid formation of gel and improving its bonding performance. In contrast, existing mine backfill materials add stainless steel slag, raw steel slag, corn cobs, waste fir trees, and waste seashells, which not only reduces waste emissions from raw material-related industries but also achieves waste utilization and environmental protection. Furthermore, the added waste materials are not only low-cost but also greatly enhance the effectiveness of the mine backfill material. Detailed Implementation

[0011] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0012] Example 1 A mine backfill material based on the synergistic effect of multiple solid wastes and its preparation method are disclosed. The formula of the mine backfill material is as follows: cement clinker: 15 parts, fly ash: 8 parts, desulfurized gypsum: 5 parts, early strength agent: 3 parts, coal gangue particles: 30 parts, stainless steel slag: 10 parts, raw steel slag: 8 parts, corn cob: 20 parts, waste fir tree: 30 parts, waste seashell: 25 parts, alkali activator: 18 parts.

[0013] Among them, the alkaline activators include sodium hydroxide, sodium hexafluoroaluminate, water glass and diethanolamine.

[0014] Preferred ratio of sodium hydroxide, sodium hexafluoroaluminate, water glass and diethanolamine is sodium hydroxide (5): sodium hexafluoroaluminate (3): water glass (4): diethanolamine (2).

[0015] Preferred: The early strength agent is anhydrous sodium sulfate.

[0016] Preferably, the particle size of the coal gangue is less than 1.5 cm.

[0017] A mine backfill material based on the synergistic effect of multiple solid wastes, the preparation method of which includes the following steps: Step 1: Pre-treat stainless steel slag and raw steel slag materials. Select undisturbed stainless steel slag and raw steel slag with a diameter of 15-35 mm, and perform carbonization treatment for 80 hours. After carbonization, perform high-temperature drying and grinding and crushing treatment, and the particle size after crushing is 2-3 mm. Step 2: Pre-treat the corn cobs and waste cedar trees. Peel the waste cedar trees and then dry the corn cobs and waste cedar trees at high temperature for 24 hours. Step 3: Processing waste shells. The collected waste shells are cleaned and air-dried. After that, they are dried at a high temperature of 110 degrees Celsius for 15 hours. After that, the waste shells, corn cobs and waste cedar trees are crushed together. During the crushing process, the stainless steel slag crushed in Step 1 and the raw steel slag are poured into the crushing device and crushed for 1 hour to obtain a mixture. Step 4: Prepare the alkali activator. Select the proportions of sodium hydroxide, sodium hexafluoroaluminate, water glass and diethanolamine, and combine them to prepare the alkali activator. Set aside for later use. Step 5: Pour the mixture obtained in Step 3 into the mixing device, and then pour the cement clinker, fly ash, desulfurized gypsum and coal gangue particles into the mixing device in sequence. Set the mixing time to 1 hour, and then pour the early strength agent and alkali activator into the mixing device in batches and continue mixing for 20 minutes to prepare the mine filling material based on the synergistic effect of multiple solid wastes.

[0018] Example 2 A mine backfill material based on the synergistic effect of multiple solid wastes and its preparation method are disclosed. The formula of the mine backfill material is as follows: cement clinker: 25 parts, fly ash: 14 parts, desulfurized gypsum: 10 parts, early strength agent: 6 parts, coal gangue particles: 40 parts, stainless steel slag: 12 parts, raw steel slag: 11 parts, corn cob: 30 parts, waste fir tree: 45 parts, waste seashell: 35 parts, alkali activator: 20 parts.

[0019] Among them, the alkaline activators include sodium hydroxide, sodium hexafluoroaluminate, water glass and diethanolamine.

[0020] Preferred ratio of sodium hydroxide, sodium hexafluoroaluminate, water glass and diethanolamine is sodium hydroxide (6): sodium hexafluoroaluminate (4): water glass (5): diethanolamine (2).

[0021] Preferred: The early strength agent is anhydrous sodium sulfate.

[0022] Preferably, the particle size of the coal gangue is less than 1.5 cm.

[0023] A mine backfill material based on the synergistic effect of multiple solid wastes, the preparation method of which includes the following steps: Step 1: Pre-treat stainless steel slag and raw steel slag materials. Select undisturbed stainless steel slag and raw steel slag with a diameter of 15-35 mm, and perform carbonization treatment for 135 hours. After carbonization, perform high-temperature drying and grinding and crushing treatment, and the particle size after crushing is 2-3 mm. Step 2: Pre-treat the corn cobs and waste cedar trees. Peel the waste cedar trees and then dry the corn cobs and waste cedar trees at high temperature for 27 hours. Step 3: Processing waste shells. The collected waste shells are cleaned and air-dried. After that, they are dried at a high temperature of 110 degrees Celsius for 17 hours. After that, the waste shells, corn cobs and waste cedar trees are crushed together. During the crushing process, the stainless steel slag crushed in Step 1 and the raw steel slag are poured into the crushing device and crushed for 2 hours to obtain a mixture. Step 4: Prepare the alkali activator. Select the proportions of sodium hydroxide, sodium hexafluoroaluminate, water glass and diethanolamine, and combine them to prepare the alkali activator. Set aside for later use. Step 5: Pour the mixture obtained in Step 3 into the mixing device, and then pour the cement clinker, fly ash, desulfurized gypsum and coal gangue particles into the mixing device in sequence. Set the mixing time to 1 hour, and then pour the early strength agent and alkali activator into the mixing device in batches and continue mixing for 25 minutes to prepare the mine filling material based on the synergistic effect of multiple solid wastes.

[0024] Example 3 A mine backfill material based on the synergistic effect of multiple solid wastes and its preparation method are disclosed. The formula of the mine backfill material is as follows: cement clinker: 135 parts, fly ash: 18 parts, desulfurized gypsum: 15 parts, early strength agent: 9 parts, coal gangue particles: 50 parts, stainless steel slag: 15 parts, raw steel slag: 14 parts, corn cob: 40 parts, waste fir tree: 55 parts, waste seashell: 45 parts, alkali activator: 22 parts.

[0025] Among them, the alkaline activators include sodium hydroxide, sodium hexafluoroaluminate, water glass and diethanolamine.

[0026] Preferred ratio of sodium hydroxide, sodium hexafluoroaluminate, water glass and diethanolamine is sodium hydroxide (7): sodium hexafluoroaluminate (5): water glass (6): diethanolamine (2).

[0027] Preferred: The early strength agent is anhydrous sodium sulfate.

[0028] Preferably, the particle size of the coal gangue is less than 1.5 cm.

[0029] A mine backfill material based on the synergistic effect of multiple solid wastes, the preparation method of which includes the following steps: Step 1: Pre-treat stainless steel slag and raw steel slag materials. Select undisturbed stainless steel slag and raw steel slag with a diameter of 15-35 mm, and perform carbonization treatment on them for 160 hours. After carbonization, perform high-temperature drying and grinding and crushing treatment, and the particle size after crushing is 2-3 mm. Step 2: Pre-treat the corn cobs and waste cedar trees. Peel the waste cedar trees and then dry the corn cobs and waste cedar trees at high temperature for 30 hours. Step 3: Processing waste shells. The collected waste shells are cleaned and air-dried. After that, they are dried at a high temperature of 110 degrees Celsius for 20 hours. After that, the waste shells, corn cobs and waste cedar trees are crushed together. During the crushing process, the stainless steel slag crushed in Step 1 and the raw steel slag are poured into the crushing device together and crushed for 3 hours to obtain a mixture. Step 4: Prepare the alkali activator. Select the proportions of sodium hydroxide, sodium hexafluoroaluminate, water glass and diethanolamine, and combine them to prepare the alkali activator. Set aside for later use. Step 5: Pour the mixture obtained in Step 3 into the mixing device, and then pour the cement clinker, fly ash, desulfurized gypsum and coal gangue particles into the mixing device in sequence. Set the mixing time to 1 hour, and then pour the early strength agent and alkali activator into the mixing device in batches and continue mixing for 30 minutes to prepare the mine filling material based on the synergistic effect of multiple solid wastes.

[0030] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A mine backfill material based on the synergistic effect of multiple solid wastes and its preparation method, characterized in that: The formula for the mine filling material is as follows: cement clinker: 15-35 parts, fly ash: 8-18 parts, desulfurized gypsum: 5-15 parts, early strength agent: 3-9 parts, coal gangue particles: 30-50 parts, stainless steel slag: 10-15 parts, raw steel slag: 8-14 parts, corn cob: 20-40 parts, waste fir trees: 30-55 parts, waste seashells: 25-45 parts, alkali activator: 18-22 parts.

2. The mine backfill material based on the synergistic effect of multiple solid wastes according to claim 1, characterized in that: The alkaline activator includes sodium hydroxide, sodium hexafluoroaluminate, water glass, and diethanolamine.

3. A mine backfill material based on the synergistic effect of multiple solid wastes according to claim 2, characterized in that: The ratio of sodium hydroxide, sodium hexafluoroaluminate, water glass and diethanolamine is sodium hydroxide (5-7): sodium hexafluoroaluminate (3-5): water glass (4-6): diethanolamine (2).

4. A mine backfill material based on the synergistic effect of multiple solid wastes according to claim 1, characterized in that: The early strength agent is anhydrous sodium sulfate.

5. A mine backfill material based on the synergistic effect of multiple solid wastes according to claim 1, characterized in that: The particle size of the coal gangue is less than 1.5 centimeters.

6. A mine backfill material based on the synergistic effect of multiple solid wastes according to claims 1-5, characterized in that: The preparation method of the mine backfill material based on the synergistic effect of multiple solid wastes includes the following steps: Step 1: Pre-treat stainless steel slag and raw steel slag materials. Select undisturbed stainless steel slag and raw steel slag with a diameter of 15-35 mm, and perform carbonization treatment on them for 80-160 hours. After carbonization, perform high-temperature drying and grinding and crushing treatment, and the particle size after crushing is 2-3 mm. Step 2: Pre-treat the corn cobs and waste cedar trees. Peel the waste cedar trees and then dry the corn cobs and waste cedar trees at high temperature for 24-30 hours. Step 3: Processing waste shells. The collected waste shells are cleaned and air-dried. After that, they are dried at a high temperature of 110 degrees Celsius for 15-20 hours. After that, the waste shells, corn cobs and waste cedar trees are crushed together. During the crushing process, the stainless steel slag crushed in Step 1 and the raw steel slag are poured into the crushing device together and crushed for 1-3 hours to obtain a mixture. Step 4: Prepare the alkali activator. Select the proportions of sodium hydroxide, sodium hexafluoroaluminate, water glass and diethanolamine, and combine them to prepare the alkali activator. Set aside for later use. Step 5: Pour the mixture obtained in Step 3 into the mixing device, and then pour the cement clinker, fly ash, desulfurized gypsum, and coal gangue particles into the mixing device in sequence. Set the mixing time to 1 hour, and then pour the early strength agent and alkali activator into the mixing device in batches and continue mixing for 20-30 minutes to prepare the mine filling material based on the synergistic effect of multiple solid wastes.