CN-122010498-A - Preparation method and process of roadway thin-spraying new material based on mine solid waste utilization

CN122010498ACN 122010498 ACN122010498 ACN 122010498ACN-122010498-A

Abstract

The invention belongs to the technical field of mine engineering and solid waste resource utilization, and relates to a preparation method and a process of a thin tunnel spraying new material based on mine solid waste utilization, wherein the thin tunnel spraying new material takes mine solid waste (such as gold tailing) generated in a mineral separation process as main aggregate and filler, and combines cement, butylbenzene emulsion, polyvinyl alcohol fiber, hydroxypropyl methyl cellulose, cement accelerator, polycarboxylate water reducer, dodecanol ester film forming agent, KH550 silane coupling agent and water, the new roadway thin-spraying material is obtained through compounding and process design, is used for sealing surfaces of mine roadways, chambers, working surfaces and side slopes, preventing weathering, preventing air leakage, reinforcing and supporting, has remarkable advantages in the aspects of resource utilization efficiency, economic cost, mechanical property and construction adaptability compared with the traditional sprayed concrete material, realizes the technical integration of three-in-one of solid waste recycling, supporting high efficiency and cost control, and provides a solution with environmental benefit and economic benefit.

Inventors

YAN BAOXU
WANG ZEHANG
LAI XINGPING
JIA HANWEN
YAO SIHAN
DU WENLEI
WANG BO
HE XIA
LI LINCHAO

Assignees

西安科技大学
山东黄金矿业科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260225

Claims (10)

1. The preparation method of the roadway thin-spraying new material based on mine solid waste utilization is characterized by comprising the following steps: Uniformly stirring gold tailings, cement, polyvinyl alcohol fibers, hydroxypropyl methylcellulose and cement accelerator to obtain a dry-mixed mixture, wherein the mass ratio of the gold tailings to the cement is 3:7, and the mixing amount of the polyvinyl alcohol fibers, the hydroxypropyl methylcellulose and the cement accelerator is 0.3%, 0.1% and 8% of the total mass of the gold tailings and the cement respectively Adding water according to a water-cement ratio of 0.45, and sequentially adding styrene-butadiene emulsion, a polycarboxylate water reducer, a dodecanol ester film forming agent and a KH550 silane coupling agent into the water, and uniformly dispersing to obtain a mixed solution, wherein the doping amounts of the styrene-butadiene emulsion, the polycarboxylate water reducer, the dodecanol ester film forming agent and the KH550 silane coupling agent are respectively 10%, 0.5%, 1% and 1% of the total mass of the gold tail sand and the cement; and pouring the mixed solution into the dry-mixed mixture, and heating and stirring until the mixture has uniform color and luster, uniform texture and no dry powder mass and bleeding phenomenon, thereby preparing the new roadway thin-spraying material.
2. The method for preparing the roadway thin-spraying new material based on mine solid waste utilization, which is characterized in that the grain size of the gold tailings is set to be 0< 70 mu m, and the length of the polyvinyl alcohol fiber is 3mm.
3. The method for preparing the roadway thin-spraying new material based on mine solid waste utilization, which is characterized in that the cement accelerator is an alkali-free or low-alkali liquid accelerator, and the viscosity of hydroxypropyl methylcellulose is 200000mPa.
4. The method for preparing the roadway thin-spraying new material based on mine solid waste utilization, which is disclosed in claim 1, is characterized in that the stirring step for preparing a dry-mixing mixture comprises the steps of dry-mixing gold tailings, cement, polyvinyl alcohol fibers, hydroxypropyl methyl cellulose and cement accelerator at 55 r/min-65 r/min for 1-2 min, primarily mixing the materials, and then dry-mixing at a stirring speed of 115 r/min-125 r/min for 1-2 min.
5. The method for preparing the roadway thin-spraying new material based on mine solid waste utilization, which is characterized in that the stirring speed is 115 r/min-125 r/min and the stirring time is 1 min-2 min when the mixed solution is prepared.
6. The method for preparing the thin tunnel spraying new material based on the mine solid waste utilization, which is disclosed in claim 1, is characterized in that the heating temperature is 19-21 ℃ when the thin tunnel spraying new material is prepared, the thin tunnel spraying new material is firstly stirred at a stirring speed of 55-65 r/min for 2-3 min, and then stirred at a stirring speed of 115-125 r/min for 2-3 min.
7. The method for preparing the roadway thin-spraying new material based on mine solid waste utilization, which is characterized in that the cement accelerator is an alkali-free accelerator or a low-alkali accelerator.
8. The roadway thin-spraying new material prepared by the method for preparing the roadway thin-spraying new material based on mine solid waste utilization according to any one of claims 1-7.
9. The thin spray process of the new roadway thin spray material according to claim 8, wherein the thin spray process is a manual spray gun thin spray process or a mechanical arm spray gun thin spray process; When a manual spray gun thin spraying process is adopted, preparing a thin spraying new material of a roadway according to the preparation method of the thin spraying new material of the roadway based on mine solid waste utilization, which is given in the embodiments 1-9, pumping the thin spraying new material of the roadway to a manual spray gun, spraying the thin spraying new material in a mode of top down, layering and slicing, and carrying out finishing and sprinkling maintenance before final setting after spraying to form a spraying layer; when the mechanical arm spray gun thin spraying technology is adopted, the roadway thin spraying new material is prepared according to the preparation method of the roadway thin spraying new material based on mine solid waste utilization, which is provided in the embodiment 1-9, cement accelerator is not added temporarily, the prepared thin spraying new material is pumped to a mechanical arm spray gun nozzle, cement accelerator is added to the mechanical arm spray gun nozzle, the thin spraying new material is sprayed in a preliminary spraying layering mode and then sprayed again, and surface finishing and moisturizing maintenance are carried out after spraying, so that a spraying layer is formed.
10. The use of the thin sprayed new material mine tunnel, chamber, working surface and slope surface closure, weather protection, air leakage protection, reinforcement and support according to claim 8.

Description

Preparation method and process of roadway thin-spraying new material based on mine solid waste utilization Technical Field The invention belongs to the technical field of mine engineering and solid waste resource utilization, and particularly relates to a preparation method and a process of a roadway thin-spraying new material based on mine solid waste utilization. Background During the exploitation and beneficiation of metal mines, particularly gold ores, a large amount of solid waste-gold tailings is generated. These tailings are usually discharged to a tailing pond in the form of slurry for stockpiling, so that not only a large amount of land resources are occupied, but also potential safety and environmental risks such as dust pollution, heavy metal ion migration, dam instability and the like exist. How to consume and utilize gold tailings on a large scale with high added value is one of the key problems to be solved in order to realize sustainable development of mining industry. At present, the comprehensive utilization rate of the gold tailings is still low, so that a novel building material capable of efficiently consuming the gold tailings is developed, and the gold tailings has important environmental protection significance and resource recycling value. Meanwhile, in the mine construction and production process, the stability of surrounding rocks of underground projects such as roadways, chambers and the like is important. The thin spray support technology is used as a high-efficiency surface sealing and active support arm section, can effectively prevent surrounding rock from weathering and peeling, seal cracks, prevent air leakage and has certain bearing and toughening effects. The traditional sprayed concrete material has the problems of large cement consumption, high material cost, large dust, high rebound rate, slow early strength development, easiness in cracking, insufficient adhesion with surrounding rock and the like, and the spraying thickness is generally larger (about 100 mm), so that the material consumption per unit area is large, and the comprehensive cost is higher. The gold tailings are applied to mine thin spraying materials, so that waste treatment with waste and waste recycling can be realized, solid waste can be consumed in a large scale, the tailing disposal cost is reduced, and an economic and efficient supporting material can be provided for mines, so that the mine thin spraying material has remarkable environmental and economic benefits. However, the physicochemical characteristics (such as particle morphology, grading, surface activity and the like) of the gold tailings are significantly different from those of natural river sand or machine-made sand, and the direct substitution of a large amount of gold tailings can lead to the difficulty in meeting the severe requirements of thin mine spraying support on the workability, mechanical properties and durability of new materials. Especially for engineering occasions requiring rapid support, the early strength development rate of the material is important. In the prior art, although a lot of researches on thin spraying materials are carried out, the researches on a system formula which can realize the high-doping amount utilization of gold tailings and simultaneously realize the rapid development of the early strength and the long-term durability of the materials still have obvious defects. For example, some patents emphasize the toughening effect of polymers but neglect early strength guarantees, others focus on rapid setting effects, but have limited amounts of solid waste incorporation or insufficient toughness of materials. In addition, existing thin spray materials often fail to achieve a good balance between cost control and performance optimization, resulting in their facing economic constraints in practical popularization. Disclosure of Invention Aiming at the defects of the prior art, the invention aims to provide a preparation method and a process of a new roadway thin spraying material based on mine solid waste utilization, the new roadway thin spraying material prepared by the method takes gold tailings as main components, and the new roadway thin spraying material meets various requirements of mine thin spraying support through scientific proportioning design and composite modification of various functional additives (polyvinyl alcohol fibers, hydroxypropyl methylcellulose, cement accelerator, styrene-butadiene emulsion, polycarboxylate water reducer, dodecyl ester film forming agent and KH550 silane coupling agent) while realizing effective absorption of the gold tailings. In order to solve the technical problems, the invention provides a method for preparing a roadway thin-spraying new material based on mine solid waste utilization, which comprises the following steps: Uniformly stirring gold tailings, cement, polyvinyl alcohol fibers, hydroxypropyl methylcellulose and cement accelerator to obtain a dry-mixed m