A green and environmentally friendly multi-functional additive for mining and its preparation and use method

Abstract

The present invention belongs to the field of dust prevention and control and fire prevention and extinguishing technology in coal mine tunnel excavation, and specifically relates to a green and environmentally friendly multi-effect functional additive for mining and its preparation and use method. The multi-effect functional additive prepared by the present invention is made by mixing 30%-70% of inorganic composite ultrafine powder material, 20%-50% of composite high-efficiency water-solidifying agent, 5%-15% of composite dispersing wetting agent, 1%-10% of cross-linking film-forming agent and 1%-10% of fire-retardant stabilizer, and can be used in underground spray system or coal seam water injection to reduce the surface tension of water, promote the wetting and sedimentation of coal dust, make coal dust be quickly collided and wetted by water mist, intercept and wrap, suppress coal dust and dust generated in the mining process, enhance dust reduction efficiency, and can be used as a dust capture agent, fire extinguishing grouting suspension agent, inhibitor, and fire extinguishing colloid component, with broad application prospects.

Description

Technical Field

[0001] The invention belongs to the technical field of dust prevention and control and fire prevention and extinguishing in coal mine tunnel excavation, and specifically relates to a green and environment-friendly multi-functional auxiliary agent for mining and a preparation and use method thereof. Background Art

[0002] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention, and should not necessarily be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art.

[0003] Coal is the main energy source in China. With the continuous expansion of mining scale, the amount of new tunnels dug in mines each year remains high. In specific coal mining, especially tunnel excavation operations, there is often a lot of dust. These dusts are formed during the operation. After these dusts are generated, they will become more and more over time. Not only will they wear out equipment parts and block the sight of the operation, but workers will also develop pneumoconiosis under such environmental conditions for a long time, which seriously threatens their own health. In addition, after excessive accumulation of coal dust and dust, explosion accidents will occur, resulting in serious losses in coal mining.

[0004] Therefore, in coal mine working face mining and tunnel excavation operations, corresponding effective dust reduction technologies and methods must be adopted. Specifically, there are three main existing dust reduction methods, namely: 1. Coal seam water injection dust reduction method; 2. Excavation spray method; 3. Dust reduction method with dust suppressor.

[0005] However, due to the special physical and chemical properties of coal dust and the presence of hydrophobic groups on the surface, traditional ventilation dust removal and spray dust reduction are not effective and cannot meet the needs of working face operations. Therefore, spray dust reduction is the most commonly used and relatively effective dust reduction method in mines, but the surface tension of ordinary water is large, and dust, especially coal dust, cannot be quickly wetted and wrapped when it comes into contact with water mist. Water mist can only promote coal dust sedimentation by colliding with coal dust, and the dust reduction effect is greatly limited; secondly, traditional spray dust reduction is very likely to cause secondary dust after water loss over time, especially coal seams with a short natural ignition period will have fire hazards.

[0006] Therefore, it is very necessary to develop a multi-functional additive that can effectively capture dust and effectively prevent and control coal seam fires. Summary of the invention

[0007] In view of the problems existing in the prior art, the present invention provides a green and environmentally friendly multi-functional auxiliary agent for mining and a preparation and use method thereof. The multi-functional auxiliary agent can be used as a dust capture agent, a fire-proof grouting suspension agent, an inhibitor, and a fire-extinguishing colloid.

[0008] In order to achieve the above object, the present invention adopts the following technical solution:

[0009] The first aspect of the present invention provides a green and environmentally friendly multi-functional additive for mining, which comprises, by weight, 30%-70% of inorganic composite ultrafine powder material, 20%-50% of composite high-efficiency water-solidifying agent, 5%-15% of composite dispersing wetting agent, 1%-10% of cross-linking film-forming agent, and 1%-10% of fire-retardant stabilizer.

[0010] Preferably, the raw material composition of the green and environmentally friendly multi-functional mining additive includes, by weight: 35%-50% of inorganic composite ultrafine powder material, 25%-50% of composite high-efficiency water-solidifying agent, 5%-10% of composite dispersing wetting agent, 1%-5% of cross-linking film-forming agent, and 1%-8% of fire-retardant stabilizer.

[0011] The weight ratio of carbide slag, desulfurized gypsum powder, red mud, soda ash and printing and dyeing wastewater in the inorganic composite ultrafine powder material is 3:2:2:1:(1-10); the composite high-efficiency water-solidifying agent is composed of inorganic A component and organic B component, and the weight ratio of A:B component is 1:(1-5), wherein the weight ratio of calcium sulfoaluminate, sodium aluminate, calcium oxide powder and calcium formate in the inorganic A component is 8:(1-3):2:1; the weight ratio of sodium polyacrylate, cold water instant polyacrylamide and the organic B component is 1:(1-5):1:(1-3):2:1. The weight ratio of amine and cold water instant carboxymethyl cellulose is (1-15):3:2; the weight ratio of sodium hexametaphosphate, polyvinyl pyrrolidone, plant protein air entraining agent and gum arabic powder in the composite dispersing wetting agent is 1:(1-3):2:1; the weight ratio of VAE rubber powder, sodium alginate and polyvinyl alcohol in the cross-linking film-forming agent is (1-5):2:3; the weight ratio of water-soluble nitrogen-phosphorus flame retardant, nano silicon carbide and nano modified graphite powder in the fire retardant stabilizer is (1-5):4:3.

[0012] The second aspect of the present invention provides a method for preparing the above-mentioned green and environmentally friendly multi-functional additive for mining, comprising the following steps:

[0013] S1, mixing carbide slag, desulfurized gypsum powder, red mud, soda ash, and printing and dyeing wastewater and calcining them to obtain an inorganic composite ultrafine powder material;

[0014] S2, mixing calcium sulfoaluminate, sodium aluminate, calcium oxide powder, and calcium formate to obtain an inorganic A component; mixing sodium polyacrylate, cold water instant polyacrylamide, and cold water instant carboxymethyl cellulose to obtain an organic B component; mixing the inorganic A component and the organic B component to obtain a composite high-efficiency water-solidifying agent;

[0015] S3, mixing sodium hexametaphosphate, polyvinyl pyrrolidone, plant protein air entraining agent, and gum arabic powder to prepare a composite dispersing wetting agent;

[0016] S4, mixing VAE rubber powder, sodium alginate and polyvinyl alcohol to prepare a cross-linking film-forming agent;

[0017] S5, mixing water-soluble nitrogen-phosphorus flame retardant, nano silicon carbide, and nano modified graphite powder to prepare a fire retardant stabilizer;

[0018] S6. Fully mix the inorganic composite ultrafine powder material, composite high-efficiency water-solidifying agent, composite dispersing wetting agent, cross-linking film-forming agent and fire-retardant stabilizer to prepare a multi-effect functional additive.

[0019] Preferably, in step S1, carbide slag, desulfurized gypsum powder, red mud, soda ash and printing and dyeing wastewater are mixed in proportion at room temperature and then calcined for 1 hour.

[0020] Preferably, in step S1, the calcination reaction temperature is 1000-1300° C., and the calcination reaction time is 1.5-2.5 h; further preferably, the calcination reaction temperature is 1250° C., and the calcination reaction time is 2 h.

[0021] Preferably, in step S1, the reactants after the calcination reaction are ground; the specific surface area of ​​the inorganic composite ultrafine powder material after the grounding is not less than 800m 2 / kg.

[0022] Preferably, in step S2, the inorganic component A and the organic component B are mixed in a weight ratio of 1:(5-10).

[0023] The third aspect of the present invention provides a method for using a green and environmentally friendly multi-functional additive for mining, specifically: when working on the working face of a coal mine tunnel, the multi-functional additive is mixed with water and sprayed.

[0024] Preferably, the multi-effect functional additive and water are mixed in a weight ratio of 1:(50-1000).

[0025] The fourth aspect of the present invention provides an application of the green and environmentally friendly multi-functional mining additive described in the first aspect in components such as dust capture agents, inhibitors, fire extinguishing grouting suspension agents, and fire extinguishing colloids.

[0026] The beneficial effects achieved by one or more technical solutions of the present invention are as follows:

[0027] (1) The present invention utilizes industrial waste carbide slag, desulfurized gypsum powder, red mud and printing and dyeing wastewater to make resource utilization of solid waste with low cost and good economic and environmental benefits.

[0028] (2) The multi-functional auxiliary agent for mining prepared by the present invention combines multiple functions such as wetting, bonding, moisturizing, chemical inhibition, fire prevention, and fire extinguishing, and has a better dust suppression effect.

[0029] (3) The core raw materials used in the present invention have good water solubility and can be dissolved in water at room temperature without agglomerating into lumps.

[0030] (4) The multi-functional additive prepared by the present invention can be used as a dust capture agent in an underground spray system or coal seam water injection to reduce the surface tension of water, promote the wetting and sedimentation of coal dust, and allow the coal dust to be quickly collided, wetted, intercepted and wrapped by water mist, thereby inhibiting the coal dust and dust generated during the mining process and enhancing the dust reduction efficiency.

[0031] The multi-effect functional auxiliary agent prepared by the present invention can be used as an inhibitor to completely replace inhibitor products such as MgCl2 and CaCl2, with an inhibition rate of up to 85-100%. It can be used for fire prevention and extinguishing at places with potential spontaneous combustion risks such as opening cutting holes on the working face, stopped mining lines, air intake and return corners, high-risk areas, broken coal pillars along the air, and floating coal near the back of the frame, as well as in burning coal.

[0032] The multi-effect functional additive prepared by the invention can be used as a suspending agent, can be mixed with other materials for grouting for fire prevention and extinguishing, can improve the suspension performance and water retention performance of solid materials such as calcium oxide powder, loess, sand, etc., the slurry does not stratify or precipitate when it passes through the grouting pipeline in the slurry pool, and there is no need to clean the pipeline; the slurry is prepared once and used several times, and the upper and lower corners, the back of the frame and other required parts can be quantitatively grouted and sprayed at any time, the surface of the coal rock mass can be covered to prevent oxidation, effectively reduce air leakage in the goaf, change the three-zone relationship in the goaf, prevent the generation of harmful gases such as CO, and solve the problem of spontaneous combustion once and for all; no chemical reaction occurs during use, no heat is generated, and it is harmless to the human body, and can be used for the treatment of harmful gases in the goaf when the speed of unsealing, withdrawal and mining advancement of the underground comprehensive mining working face is slow.

[0033] The multi-effect functional auxiliary agent prepared by the invention can be used as a fire-proofing colloid and can withstand a high temperature of 800-1000°C and effectively extinguish a coal seam fire. DETAILED DESCRIPTION

[0034] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0035] As mentioned above, spray dust reduction is the most commonly used and relatively effective dust reduction method in mines. However, the surface tension of ordinary water is relatively large. Dust, especially coal dust, cannot be quickly wetted and wrapped when it comes into contact with water mist. Water mist can only promote the sedimentation of coal dust by colliding and intercepting the coal dust, and the dust reduction effect is greatly limited. Therefore, adding dust suppressants to the spray to reduce the surface tension of water, so that the coal dust can be quickly collided, wetted, intercepted and wrapped by water mist, and suppressing the coal dust and dust generated during the mining process is a technical problem that needs to be urgently solved by technical personnel in this field.

[0036] In a specific embodiment of the present invention, a green and environmentally friendly multi-functional additive for mining is provided, and its raw material composition includes, by weight: 30%-70% of inorganic composite ultrafine powder material, 20%-50% of composite high-efficiency water-solidifying agent, 5%-10% of composite dispersing wetting agent, 1%-10% of cross-linking film-forming agent, and 1%-10% of fire-retardant stabilizer.

[0037] In another specific embodiment of the present invention, the raw material composition of the green and environmentally friendly mining multi-functional additive includes, by weight: 35%-50% of inorganic composite ultrafine powder material, 25%-50% of composite high-efficiency water-solidifying agent, 5%-10% of composite dispersing wetting agent, 1%-5% of cross-linking film-forming agent, and 1%-8% of fire-retardant stabilizer.

[0038] The weight ratio of carbide slag, desulfurized gypsum powder, red mud, soda ash and printing and dyeing wastewater in the inorganic composite ultrafine powder material is 3:2:2:1:(1-10); the composite high-efficiency water-solidifying agent is composed of inorganic A component and organic B component, and the weight ratio of A:B component is 1:(1-5), wherein the weight ratio of calcium sulfoaluminate, sodium aluminate, calcium oxide powder and calcium formate in the inorganic A component is 8:(1-3):2:1; the weight ratio of sodium polyacrylate, cold water instant polyacrylamide and the organic B component is 1:(1-5):1:(1-3):2:1. The weight ratio of amine and cold water instant carboxymethyl cellulose is (1-15):3:2; the weight ratio of sodium hexametaphosphate, polyvinyl pyrrolidone, plant protein air entraining agent and gum arabic powder in the composite dispersing wetting agent is 1:(1-3):2:1; the weight ratio of VAE rubber powder, sodium alginate and polyvinyl alcohol in the cross-linking film-forming agent is (1-5):2:3; the weight ratio of water-soluble nitrogen-phosphorus flame retardant, nano silicon carbide and nano modified graphite powder in the fire retardant stabilizer is (1-5):4:3.

[0039] In another specific embodiment of the present invention, a method for preparing the above-mentioned green and environmentally friendly multi-functional additive for mining is provided, comprising the following steps:

[0040] S1, mixing carbide slag, desulfurized gypsum powder, red mud, soda ash, and printing and dyeing wastewater and calcining them to obtain an inorganic composite ultrafine powder material;

[0041] S2, mixing calcium sulfoaluminate, sodium aluminate, calcium oxide powder, and calcium formate to obtain an inorganic A component; mixing sodium polyacrylate, cold water instant polyacrylamide, and cold water instant carboxymethyl cellulose to obtain an organic B component; mixing the inorganic A component and the organic B component to obtain a composite high-efficiency water-solidifying agent;

[0042] S3, mixing sodium hexametaphosphate, polyvinyl pyrrolidone, plant protein air entraining agent, and gum arabic powder to prepare a composite dispersing wetting agent;

[0043] S4, mixing VAE rubber powder, sodium alginate and polyvinyl alcohol to prepare a cross-linking film-forming agent;

[0044] S5, mixing water-soluble nitrogen-phosphorus flame retardant, nano silicon carbide, and nano modified graphite powder to prepare a fire retardant stabilizer;

[0045] S6. Fully mix the inorganic composite ultrafine powder material, composite high-efficiency water-solidifying agent, composite dispersing wetting agent, cross-linking film-forming agent and fire-retardant stabilizer to prepare a multi-effect functional additive.

[0046] In another specific embodiment of the present invention, in step S1, carbide slag, desulfurized gypsum powder, red mud, soda ash, and printing and dyeing wastewater are mixed in proportion at room temperature and calcined after 1 hour.

[0047] In another specific embodiment of the present invention, in step S1, the temperature of the calcination reaction is 1000-1300° C., and the calcination reaction time is 1.5-2.5 hours.

[0048] In another specific embodiment of the present invention, the calcination reaction temperature is 1250° C., and the calcination reaction time is 2 hours.

[0049] In another specific embodiment of the present invention, in step S1, the reactants after the calcination reaction are ground; the specific surface area of ​​the inorganic composite ultrafine powder material after the grounding is not less than 800m 2 / kg.

[0050] In another specific embodiment of the present invention, in step S2, the inorganic component A and the organic component B are mixed in a weight ratio of 1:(5-10).

[0051] In another specific embodiment of the present invention, a method for using a green and environmentally friendly multi-functional additive for mining is provided, specifically: when working on the working face of a coal mine tunnel, the multi-functional additive is mixed with water and sprayed.

[0052] In another specific embodiment of the present invention, the multi-effect functional additive and water are mixed in a volume ratio of 1:(50-1000).

[0053] In another specific embodiment of the present invention, there is provided an application of the above-mentioned green and environmentally friendly mining multi-functional additive in components such as dust capture agents, fire-proof grouting suspension agents, inhibitors, and fire-extinguishing colloids.

[0054] Raw materials and functions:

[0055] Inorganic composite ultrafine powder material: Inorganic composite ultrafine powder material utilizes industrial solid waste calcium carbide slag, desulfurized gypsum powder, red mud, soda ash and wastewater from printing and dyeing factories. The main functions are as follows: 1. Sodium sulfate generated by the reaction of sodium hydroxide in printing and dyeing wastewater with sulfate is a hygroscopic and easily soluble salt, and its moisturizing and wetting effect is utilized; 2. The main component of calcium carbide slag is calcium hydroxide. After calcination and grinding, the specific surface area is greatly increased. It is not easy to produce a solid-liquid mixture when mixed with water. Calcium hydroxide can be used as an inhibitor to remove hydrogen sulfide gas generated by coal seams. It can play a better inhibitory role by being used in conjunction with fireproof stabilizers; calcium hydroxide cooperates with inorganic A component in the composite high-efficiency water-solidifying agent to absorb a large amount of water to form calcium aluminate, which can convert free water into bound water; 3. Red mud is an extremely fine particle strong alkaline solid waste produced in the process of producing alumina with bauxite as raw material. It has potential gelling properties. The following main chemical reactions occur between red mud and soda ash (sodium carbonate) during high-temperature calcination:

[0056] Al2O3+Na2CO3=Na2O·Al2O3+CO2↑

[0057] Fe2O3+Na2CO3=Na2O·Fe2O3+CO2↑

[0058] SiO2+2CaO=2CaO·SiO2

[0059] At the same time, some minerals such as tricalcium aluminate and tetracalcium aluminoferrate are also generated. Like silicate cement, dicalcium silicate, tricalcium aluminate and tetracalcium aluminoferrate are all hydraulic cementitious products. These hydraulic cementitious products can solidify into shells and have a good inhibitory effect on secondary dust after spraying.

[0060] Composite high-efficiency water-solidifying agent: The composite high-efficiency water-solidifying agent is composed of inorganic component A and organic component B. Its main function is to retain water and solidify water. The components work together to form inorganic water-solidifying gel and organic water-solidifying gel; secondly, the cross-linking between the polymer base material of the organic B component and the polymer molecules of the cross-linking film-forming agent will form a network structure. At the same time, there are various ionic groups between the molecules, which can produce strong affinity with ions.

[0061] Composite dispersing wetting agent: The composite dispersing wetting agent is composed of sodium hexametaphosphate, polyvinyl pyrrolidone, plant protein air entraining agent and gum arabic powder. The synergistic cooperation of each component can make the dust particles easier to be wetted by water. By reducing their surface tension or interfacial tension, water can spread on the surface of dust particles or penetrate into their surface, thereby wetting the dust particles.

[0062] Cross-linked film-forming agent: The cross-linked film-forming agent is composed of VAE rubber powder, sodium alginate and polyvinyl alcohol. The components work together to have good film-forming properties and good film-forming effect. The formed film has good anti-evaporation and scouring properties, and the strength is improved. Even under strong winds, it can still maintain the shape of the film, making it difficult for dust to be blown away.

[0063] Fire retardant stabilizer: The fire retardant stabilizer is composed of water-soluble nitrogen-phosphorus flame retardant, nano-silicon carbide, and nano-modified graphite powder. The fire retardant stabilizer works synergistically with other components to play a good flame retardant and fire extinguishing role.

[0064] The mechanism of action of this multi-functional additive is as follows:

[0065] Dust suppression mechanism: The dust suppression mechanism of this multi-effect functional additive is mainly that the cross-linking between the polymer base material of component B in the composite high-efficiency water-solidifying agent and the polymer molecules of the cross-linking film-forming agent will form a network structure. At the same time, there are various ionic groups between molecules, which can produce strong affinity with ions. By capturing, adsorbing and agglomerating dust particles, the dust is locked in the network structure. In combination with inorganic composite ultrafine powder materials, composite dispersing wetting agents, etc., it plays the role of wetting, bonding, condensation, moisture absorption, dust prevention, anti-erosion and anti-scouring.

[0066] Flame retardant mechanism: when used as an inhibitor, it is used by pre-injecting water into the coal seam, spraying into the goaf, spraying into the cracks and broken zones of the coal wall and coal pillars, spraying into the high temperature and high-risk areas, and spraying in the coal storage bin. It is a flowable liquid before gelling and evenly covers the surface of the coal body after gelling, isolating the contact between the coal and the air, thereby reducing the oxidation reaction process on the surface of the coal body; it can be sprayed (coated) multiple times to increase the thickness of the coating, thereby improving the fire resistance level; it has strong permeability and wall adhesion, and the protective film formed has good density, high strength, and a resistance rate of more than 85% and a long resistance life; it uses water as a solvent, is non-toxic, odorless, does not produce harmful gases and harmful waste, and does not pollute people and the environment.

[0067] Fire extinguishing mechanism: When the ignition temperature of the coal seam reaches above 240℃, the nitrogen-phosphorus flame retardant will initially decompose, and a small amount of phosphoric acid and non-combustible gas will be generated. At this stage, the nano-modified graphite powder begins to expand, and phosphoric acid as a carbonizing agent can promote the formation of a carbonized layer. As a low surface energy substance, nano-silicon carbide tends to migrate to the polymer surface and concentrate during the combustion process, forcing the expandable graphite coated with nano-silicon carbide to aggregate in the combustion area, and the concentration of some parts increases; the expandable graphite coated with nano-silicon carbide can strengthen the carbonization protective layer, promote the formation of a richer P-SI-C structure in the condensed phase, and coat the surface of the combustion area, thereby forming a more compact expanded carbon layer, and can fill the pores of the expanded carbon layer produced by the decomposition of the nitrogen-phosphorus flame retardant, increase the density of the carbon layer, and inhibit the heat transfer of combustible gases through the pores; thereby reducing the situation of falling off from the matrix caused by the expansion effect. Secondly, nitrogen-phosphorus flame retardants work synergistically with modified expandable graphite to enrich flame retardant elements, producing non-flammable gases such as NO and NH3 during combustion, and have the characteristics of both condensed phase flame retardancy and gas phase flame retardancy.

[0068] Water-solidification mechanism: The components of inorganic component A cooperate with the effective components of inorganic ultrafine powder materials to form high-solidification calcium sulfonate. The main reactions are as follows:

[0069] Al2O3+Na2CO3=Na2O·Al2O3+CO2↑

[0070] Fe2O3+Na2CO3=Na2O·Fe2O3+CO2↑

[0071] SiO2+2CaO=2CaO·SiO2

[0072] SiO2(active)+m1Ca(OH)2+xH2O→m1CaO·SiO2·xH2O

[0073] Al2O3(active)+m2Ca(OH)2+yH2O→m2CaO·Al2O3·yH2O

[0074] 2NaAlO2+3CaO+7H2O→3CaO·Al2O3·6H2O+2NaOH

[0075] Ca4Al6SO 16 +2(CaSO4·2H2O)+34H2O→3CaO·Al2O3·3CaSO4·32H2O(ettringite)+2(Al2O3

[0076] ·3H2O)

[0077] 3CaO·Al2O3·6H2O+3(CaSO4·2H2O)+20H2O→3CaO·Al2O3·3CaSO4·32H2O (ettringite)

[0078] Secondly, the sodium polyacrylate in the organic component B of the high-solid water material can absorb a large amount of water. It is a new type of functional polymer material that can absorb a thousand times more water than itself, and it is converted into a hydrogel material when it comes into contact with water. It has extremely strong moisturizing properties and will not leak water even if it is pressurized. Polyacrylamide is a linear organic polymer and also a polymer water treatment flocculant product that can specifically absorb suspended particles in water and act as a link and bridge between particles. Adding cold water-soluble carboxymethyl cellulose can increase the water retention of the colloid, and the colloid will not lose water for a long time. At the same time, the cross-linking between the polymer molecules of the gel-linking film-forming agent will form a network structure that cooperates with the organic component B. The composite colloid can retain water and solidify water for a long time.

[0079] At the same time, the synergistic cooperation of various components can effectively promote the suspension performance, water retention performance, and fire prevention and extinguishing performance of fly ash, loess, aeolian sand and other slurries. After adding this multi-effect functional additive, the fire prevention and extinguishing grouting filling can be better carried out.

[0080] The present invention will be further described in detail below in conjunction with specific embodiments. It should be noted that the specific embodiments are intended to explain the present invention rather than to limit it.

[0081] Example 1: This example provides a green and environmentally friendly multi-functional additive for mining and a preparation method thereof.

[0082] By weight, the raw material composition of the green and environmentally friendly multi-functional mining additive includes: 39% inorganic composite ultrafine powder material, 46% composite high-efficiency water-solidifying agent, 6% composite dispersing wetting agent, 3% cross-linking film-forming agent, and 6% fire-retardant stabilizer.

[0083] The specific preparation method of the green and environmentally friendly multi-functional additive for mining comprises the following steps:

[0084] S1. Calcium carbide slag, desulfurized gypsum powder, red mud, soda ash and printing and dyeing wastewater were mixed at a weight ratio of 3:2:2:1:5 at room temperature for 1 hour and then calcined at 1250°C for 2 hours. The calcined reactants were ground to a specific surface area of ​​900m 2 / kg obtained inorganic composite ultrafine powder material.

[0085] S2, calcium sulfoaluminate, sodium aluminate, calcium oxide powder, and calcium formate are mixed at a weight ratio of 8:2:2:1 at room temperature to obtain an inorganic A component; sodium polyacrylate, cold water instant polyacrylamide, and cold water instant carboxymethyl cellulose are mixed at a weight ratio of 15:3:2 at room temperature to obtain an organic B component; then the inorganic A component and the organic B component are mixed at a weight ratio of 1:5 to obtain a composite high-efficiency water-solidifying agent;

[0086] S3, mixing sodium hexametaphosphate, polyvinyl pyrrolidone, vegetable protein air entraining agent, and gum arabic powder at a weight ratio of 1:2:2:1 at room temperature to prepare a composite dispersing wetting agent;

[0087] S4, mixing VAE rubber powder, sodium alginate and polyvinyl alcohol at a weight ratio of 1:2:3 at room temperature to prepare a cross-linking film-forming agent;

[0088] S5, mixing a water-soluble nitrogen-phosphorus flame retardant, nano-silicon carbide, and nano-modified graphite powder at a weight ratio of 5:4:3 at room temperature to prepare a fire retardant stabilizer;

[0089] S6. Fully mix the inorganic composite ultrafine powder material, composite high-efficiency water-solidifying agent, composite dispersing wetting agent, cross-linking film-forming agent and fire-retardant stabilizer prepared above to prepare a multi-effect functional additive.

[0090] Example 2: This example provides a green and environmentally friendly multi-functional additive for mining and a preparation method thereof.

[0091] By weight, the raw material composition of the green and environmentally friendly multi-functional mining additive includes: 48% inorganic composite ultrafine powder material, 40% composite high-efficiency water-solidifying agent, 6% composite dispersing wetting agent, 3% cross-linking film-forming agent, and 3% fire-retardant stabilizer; the preparation steps are consistent with Example 1.

[0092] Example 3: This example provides a green and environmentally friendly multi-functional additive for mining and a preparation method thereof.

[0093] By weight, the raw material composition of the green and environmentally friendly multi-functional mining additive includes: 55% of inorganic composite ultrafine powder material, 35% of composite high-efficiency water-solidifying agent, 6% of composite dispersing wetting agent, 3% of cross-linking film-forming agent, and 1% of fire-retardant stabilizer; the preparation steps are consistent with Example 1.

[0094] Example 4: This example provides a green and environmentally friendly multi-functional additive for mining and a preparation method thereof.

[0095] By weight, the raw material composition of the green and environmentally friendly multi-functional mining additive includes: 65% of inorganic composite ultrafine powder material, 25% of composite high-efficiency water-solidifying agent, 6% of composite dispersing wetting agent, 3% of cross-linking film-forming agent, and 1% of fire-retardant stabilizer; the preparation steps are consistent with Example 1.

[0096] Comparative Example 1: The components are different from those in Example 1 in that carbide slag is not added in step S1, and the other components are the same as those in Example 1; the preparation steps are consistent with those in Example 1.

[0097] Comparative Example 2: The components are different from those in Example 1 in that no red mud is added in step S1, and the other components are the same as those in Example 1; the preparation steps are consistent with those in Example 1.

[0098] Comparative Example 3: The components are different from those in Example 1 in that no printing and dyeing wastewater is added in step S1, and the other components are the same as those in Example 1; the preparation steps are consistent with those in Example 1.

[0099] Comparative Example 4: The components are different from those in Example 1 in that the composite high-efficiency water-solidifying agent in step S2 contains only organic component B, and the other components are the same as those in Example 1; the preparation steps are consistent with those in Example 1.

[0100] Comparative Example 5: The difference from the components in Example 1 is that the composite high-efficiency water-solidifying agent in step S2 only contains inorganic component A, and the other components are the same as those in Example 1; the preparation steps are consistent with those in Example 1.

[0101] Comparative Example 6: The difference from Example 1 is that no inorganic composite ultrafine powder material is added, and the other components are the same as those in Example 1; the preparation steps are consistent with those in Example 1.

[0102] Comparative Example 7: The difference from the components of Example 1 is that no composite high-efficiency water-solidifying agent is added, and the other components are the same as those of Example 1; the preparation steps are consistent with those of Example 1.

[0103] Comparative Example 8: The difference between the components of Example 1 and Example 1 is that no composite dispersing wetting agent is added, and the other components are the same as those of Example 1; the preparation steps are consistent with those of Example 1.

[0104] Comparative Example 9: The difference between the components of Example 1 and Example 1 is that no cross-linking film-forming agent is added, and the other components are the same as those of Example 1; the preparation steps are consistent with those of Example 1.

[0105] Comparative Example 10: The difference from the components of Example 1 is that no fire retardant stabilizer is added, and the other components are the same as those of Example 1; the preparation steps are consistent with those of Example 1.

[0106] Example 5: This example provides the specific weight percentages of the components of the green and environmentally friendly mining multi-functional additives prepared in Examples 1 to 4 and Comparative Examples 1 to 10, as shown in Table 1 and Table 2:

[0107] Table 1 Content of each component of the green and environmentally friendly multi-functional additive for mining prepared in Examples 1 to 4

[0108]

[0109] Table 2 Content of each component of the green and environmentally friendly multi-functional additives for mining prepared in Comparative Examples 1 to 10

[0110]

[0111]

[0112] Test Example 1: This test example is to test the performance of the multi-functional additives prepared in the examples and comparative examples, as shown in Table 3:

[0113] Table 3 Performance parameters of multi-functional additives

[0114]

[0115]

[0116] From the results in Table 2, it can be seen that the performance of the green and environmentally friendly multi-functional additives for mining obtained in Examples 1 to 4 is better than that of Comparative Examples 1 to 10;

[0117] Compared with Example 1, in Examples 2 to 4, the proportion of inorganic composite ultrafine powder material gradually increases, and the proportion of composite high-efficiency water-solidifying agent gradually decreases, resulting in a decrease in dust suppression efficiency, retardation rate, maximum water absorption rate and temperature resistance, and a gradual increase in gelling time;

[0118] By comparing Example 1 with Comparative Examples 1 to 3, it can be seen that compared with using only a single component, the components of Example 1 are more conducive to enhancing dust suppression efficiency, retardation rate and maximum water absorption rate, and are conducive to improving temperature resistance.

[0119] By comparing Example 1 with Comparative Example 4, it can be seen that the addition of inorganic component A in the composite high-efficiency water-solidifying agent has a certain influence on the dust suppression efficiency, the inhibition rate, the maximum water absorption rate and the temperature resistance;

[0120] By comparing Example 1 with Comparative Example 5, it can be seen that the addition of organic component B in the composite high-efficiency water-solidifying agent has a great influence on the maximum water absorption rate, gelation time and temperature resistance;

[0121] By comparing Example 1 with Comparative Examples 6 to 10, it can be seen that the inorganic composite ultrafine powder material, composite high-efficiency water-solidifying agent, composite dispersing wetting agent, cross-linking film-forming agent, and fire-retardant stabilizer in the multi-effect functional additive are more conducive to enhancing the dust suppression efficiency, the retardation rate, and the maximum water absorption rate, and are conducive to improving the temperature resistance, compared with using only a single component.

[0122] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A green and environmentally friendly multi-functional additive for mining, characterized in that: The raw material composition includes, by weight: 30%-70% inorganic composite ultrafine powder material, 20%-50% composite high-efficiency water-solidifying agent, 5%-15% composite dispersing wetting agent, 1%-10% cross-linking film-forming agent, and 1%-10% fire-retardant stabilizer; The weight ratio of raw materials calcium carbide slag, desulfurized gypsum powder, red mud, soda ash and printing and dyeing wastewater in the inorganic composite ultrafine powder material is 3:2:2:1:(1-10); the weight ratio of sodium hexametaphosphate, polyvinyl pyrrolidone, plant protein air entraining agent and gum arabic powder in the composite dispersing and wetting agent is 1:(1-3):2:1; the weight ratio of VAE rubber powder, sodium alginate and polyvinyl alcohol in the cross-linking film-forming agent is 5:2:3; the weight ratio of water-soluble nitrogen-phosphorus flame retardant, nano silicon carbide and nano modified graphite powder in the fire retardant stabilizer is (1-5):4:3; The specific surface area of ​​the inorganic composite ultrafine powder material after grinding is not less than 800 m2 / kg.

2. The green and environmentally friendly multi-functional additive for mining as claimed in claim 1, characterized in that: By weight, the raw material composition of the green and environmentally friendly multi-functional mining additive includes: 35%-50% inorganic composite ultrafine powder material, 25%-50% composite high-efficiency water-solidifying agent, 5%-10% composite dispersing wetting agent, 1%-5% cross-linking film-forming agent, and 1%-8% fire-retardant stabilizer.

3. The green and environmentally friendly multi-functional additive for mining according to any one of claims 1 to 2, characterized in that: The composite high-efficiency water-solidifying agent is composed of an inorganic component A and an organic component B, wherein the weight ratio of calcium sulfoaluminate, sodium aluminate, calcium oxide powder and calcium formate in the inorganic component A is 8:(1-3):2:1; the weight ratio of sodium polyacrylate, cold water instant polyacrylamide and cold water instant carboxymethyl cellulose in the organic component B is (1-15):3:

2.

4. A method for preparing the green and environmentally friendly multi-functional additive for mining according to any one of claims 1 to 3, characterized in that: The following steps are involved: S1, mixing carbide slag, desulfurized gypsum powder, red mud, soda ash, and printing and dyeing wastewater and calcining them to obtain an inorganic composite ultrafine powder material; S2, mixing calcium sulfoaluminate, sodium aluminate, calcium oxide powder, and calcium formate to obtain an inorganic A component; mixing sodium polyacrylate, cold water instant polyacrylamide, and cold water instant carboxymethyl cellulose to obtain an organic B component; mixing the inorganic A component and the organic B component to obtain a composite high-efficiency water-solidifying agent; S3, mixing sodium hexametaphosphate, polyvinyl pyrrolidone, plant protein air entraining agent, and gum arabic powder to prepare a composite dispersing wetting agent; S4, mixing VAE rubber powder, sodium alginate and polyvinyl alcohol to prepare a cross-linking film-forming agent; S5, mixing water-soluble nitrogen-phosphorus flame retardant, nano silicon carbide, and nano modified graphite powder to prepare a fire retardant stabilizer; S6. Fully mix the inorganic composite ultrafine powder material, composite high-efficiency water-solidifying agent, composite dispersing wetting agent, cross-linking film-forming agent and fire-retardant stabilizer to prepare a multi-effect functional additive.

5. The preparation method according to claim 4, characterized in that: In step S1, the calcination reaction temperature is 1000-1300° C., and the calcination reaction time is 1.5-2.5 h.

6. The preparation method according to claim 5, characterized in that: The calcination reaction temperature is 1250° C., and the calcination reaction time is 2 h.

7. The preparation method according to claim 4, characterized in that: In step S1, the reactants after the calcination reaction are ground; the specific surface area of ​​the inorganic composite ultrafine powder material after grounding is not less than 800 m2 / kg.

8. The preparation method according to claim 4, characterized in that: In step S2, the inorganic A component and the organic B component are mixed in a weight ratio of 1:(5-10).

9. A method for using the green and environmentally friendly multi-functional additive for mining according to any one of claims 1 to 3, characterized in that: The specific method of use is: when working on the coal mine tunnel working face, the multi-effect functional additive is mixed with water and sprayed; the multi-effect functional additive and water are mixed at a weight ratio of 1: (50-200).

10. Use of the green and environmentally friendly multi-functional mining additive according to any one of claims 1 to 3 in dust capture agents, fire-proof grouting suspension agents, inhibitors, and fire-extinguishing colloid components.

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