CN-122010646-A - Soil conditioner for water and soil conservation and preparation method thereof

CN122010646ACN 122010646 ACN122010646 ACN 122010646ACN-122010646-A

Abstract

The invention belongs to the technical field of soil improvement, and particularly relates to a soil conditioner for water and soil conservation and a preparation method thereof. The soil conditioner comprises the following raw material components of zwitterionic polymer modified coal gangue, biochar, hydroxyapatite and humic acid, wherein the preparation method of the zwitterionic polymer modified coal gangue comprises the following steps of dispersing coal gangue powder in a functionalized silane coupling agent solution for a first reaction to obtain silane modified coal gangue, and placing the silane modified coal gangue in a zwitterionic self-polymer solution for a second reaction to obtain the zwitterionic polymer modified coal gangue. The invention obtains the optimal raw material composition of the soil conditioner through multiple screening. The addition of the modified coal gangue obviously enhances the water and fertilizer retention capacity of the soil, the porous structure and the hydrophilic group of the modified coal gangue effectively adsorb and retain a large amount of water and nutrients, the nutrient loss is reduced, and the soil fertility is obviously improved by the mutual cooperation of the components.

Inventors

WANG YI
GUO YAO
LIU WEI
WU YUXIN
ZHANG KAI
WANG SHUNJIE

Assignees

国能神东煤炭集团有限责任公司
中国神华能源股份有限公司神东煤炭分公司
中国矿业大学(北京)

Dates

Publication Date: 20260512
Application Date: 20251229

Claims (10)

1. A soil conditioner for water and soil conservation is characterized by comprising the following raw material components of zwitterionic polymer modified coal gangue, biochar, hydroxyapatite and humic acid; the preparation method of the zwitterionic polymer modified coal gangue comprises the following steps: dispersing gangue powder in a functional silane coupling agent solution for a first reaction to obtain silane modified gangue; placing the silane modified coal gangue in a zwitterionic self-polymer solution for a second reaction to obtain the zwitterionic polymer modified coal gangue; The functional silane coupling agent solution is formed by mixing a silane coupling agent, organic alcohol and water; the zwitterionic self-polymer is formed by polymerizing a zwitterionic monomer under the action of an initiator; The zwitterionic monomer is selected from one or more of N- (3-sulfopropyl) -N-methacryloxyethyl-N, N-dimethyl ammonium betaine, 2-methacryloxyethyl phosphorylcholine, 3- [ (3-acrylamidopropyl) dimethyl ammonium ] propionate and 3- [ [2- (methacryloxyethyl) dimethyl ammonium ] propionate.
2. The soil conditioner according to claim 1, wherein the volume ratio of the silane coupling agent, the organic alcohol and the water is 1 (1-5): (20-60); The silane coupling agent is one or more of aminopropyl triethoxysilane, 3-aminopropyl trimethoxysilane and N-beta- (aminoethyl) -gamma-aminopropyl methyl dimethoxy silane; The organic alcohol is methanol and/or ethanol.
3. The soil conditioner of claim 1, wherein the first reaction condition is a temperature of 50-70 ℃ for 4-8 hours.
4. The soil amendment according to claim 1, wherein the zwitterionic self-polymer solution is prepared according to the following method: Under inert atmosphere, adding a zwitterionic monomer into water to prepare a zwitterionic monomer solution, and then adding an initiator to react to obtain a zwitterionic self-polymer solution; The initiator is an oxidant-reducer initiator, the oxidant comprises hydrogen peroxide, sodium persulfate and potassium persulfate, and the reducer is ferrous sulfate and/or sodium sulfite.
5. The soil conditioner according to claim 4, wherein the mass ratio of the zwitterionic monomer to water is 1 (10-30); The addition amount of the initiator is 0.2% -0.6% of the mass of the zwitterionic monomer; The reaction process is that the reaction is carried out for 1-2 hours at 5-10 ℃ and then the reaction is carried out for 1-3 hours after the temperature is raised to 30-50 ℃.
6. The soil conditioner of claim 1, wherein the second reaction condition is a temperature of 25-35 ℃ for 3-5 hours.
7. The soil conditioner for soil and water conservation according to one of claims 1 to 6, wherein the soil conditioner comprises, by weight, 20 to 40 parts of zwitterionic polymer modified coal gangue, 20 to 30 parts of biochar, 10 to 20 parts of hydroxyapatite and 20 to 30 parts of humic acid.
8. The method for preparing a soil conditioner for soil and water conservation according to one of claims 1 to 7, characterized in that the preparation method comprises the following steps; s1, adding zwitterionic polymer modified coal gangue, biochar, hydroxyapatite and humic acid into a mixer according to the proportion, and stirring and mixing to obtain a mixture; and S2, adding an adhesive into the obtained mixture, extruding and granulating in a granulator, and drying to obtain the soil conditioner.
9. The preparation method of claim 8, wherein in the step S2, the adhesive is polyvinyl alcohol, and the addition amount of the adhesive is 2% -4% of the mass of the mixture; The drying condition is that the temperature is 40-45 ℃.
10. Use of a soil amendment for soil and water conservation in soil remediation and improvement of mining areas according to one of claims 1 to 7, characterized in that the method of application is: uniformly dispersing the soil conditioner on the soil surface layer of a mining area, and then turning over, and leveling the soil; the ploughing depth is 20-30 cm; The application amount of the soil conditioner is 100-300 kg/mu.

Description

Soil conditioner for water and soil conservation and preparation method thereof Technical Field The invention belongs to the technical field of soil improvement, and particularly relates to a soil conditioner for water and soil conservation and a preparation method thereof. Background The yellow river midstream region is an important ecological barrier and energy corridor intersection region, and has double tasks of ecological safety and energy safety. With the continuous pushing of the "strategic western shift" of the center of gravity of coal production, yellow river basins have become the core area of coal production. The development of research and demonstration of key technology for improving the water and soil conservation rate of large coal bases in yellow river is an urgent need for ensuring ecological safety. The scientific understanding of the water and soil loss effect generated by coal mining subsidence, research and exploration of a technical strategy for accurately preventing and controlling water and soil loss in a coal mining subsidence area have become important scientific problems and strategic demands for supporting the protection of the ecological environment of the upstream and the upstream of the yellow river and the development of high quality. However, the aggravation of coal exploitation brings a series of ecological problems such as water and soil loss, soil erosion, land desertification, surface subsidence and the like, so that the area is ecologically fragile and the restoration difficulty is high. The improvement of the water and soil conservation rate of large-scale coal bases in yellow river is an urgent need for guaranteeing national ecological safety, and especially in large-scale coal mining areas such as Shendong mining areas, the traditional treatment technology cannot effectively solve the problem of composite erosion. Therefore, aiming at the problems that the soil in the sand area is severely corroded by wind force and the water retention rate is low at present, it is very necessary to develop and screen out a soil conditioner for water and soil conservation, and apply the soil conditioner to the site to explore the effects of ecological restoration and water and soil conservation, so that a sand area soil restoration technical system with low cost and easy popularization is formed. Disclosure of Invention The invention aims to provide a soil conditioner for soil and water conservation and a preparation method thereof, which can improve the fertilizer and water conservation capacity of soil, has low product cost and can be widely used for improving the soil, preventing wind and fixing sand and maintaining the soil and water. Therefore, the invention provides the following technical scheme. The invention provides a soil conditioner for water and soil conservation, which comprises the following raw material components of zwitterionic polymer modified coal gangue, biochar, hydroxyapatite and humic acid; the preparation method of the zwitterionic polymer modified coal gangue comprises the following steps: dispersing gangue powder in a functional silane coupling agent solution for a first reaction to obtain silane modified gangue; And placing the silane modified coal gangue in a zwitterionic self-polymer solution for a second reaction to obtain the zwitterionic polymer modified coal gangue. In a preferred embodiment of the present invention, the functionalized silane coupling agent solution is formed by mixing a silane coupling agent, an organic alcohol and water. In a preferred embodiment of the present invention, the zwitterionic self-polymer is polymerized from zwitterionic monomers by the action of an initiator. In a preferred embodiment of the present invention, the zwitterionic monomer is selected from one or more of N- (3-sulfopropyl) -N-methacryloxyethyl-N, N-dimethylammonium betaine, 2-methacryloxyethyl phosphorylcholine, 3- [ (3-acrylamidopropyl) dimethylammonium ] propionate, 3- [ [2- (methacryloxyethyl) dimethylammonium ] propionate. In a preferred embodiment of the invention, the volume ratio of the silane coupling agent, the organic alcohol and the water is 1 (1-5): 20-60. In a preferred embodiment of the present invention, the silane coupling agent is selected from one or more of aminopropyl triethoxysilane, 3-aminopropyl trimethoxysilane, N- β - (aminoethyl) - γ -aminopropyl methyldimethoxysilane. In a preferred embodiment of the present invention, the organic alcohol is methanol and/or ethanol. In a preferred embodiment of the invention, the first reaction condition is that the temperature is 50-70 ℃ and the time is 4-8 hours. In a preferred embodiment of the invention, the zwitterionic self-polymer solution is prepared as follows: Under inert atmosphere, adding the zwitterionic monomer into water to prepare a zwitterionic monomer solution, and then adding an initiator to react to obtain the zwitterionic self-polymer solution. In a preferred embodiment of t