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CN-122010485-A - Cementing material and cemented filling material for filling mining

CN122010485ACN 122010485 ACN122010485 ACN 122010485ACN-122010485-A

Abstract

The invention provides a cementing material for filling mining and a cementing filling material, and relates to the technical field of industrial building material recycling. The cementing material comprises cement, slag micropowder, steel slag and fly ash, the cementing filling material comprises aggregate, cementing material and water, and the aggregate is modified phosphogypsum. The invention utilizes solid wastes such as slag, steel slag, fly ash and the like to replace part of cement to modify the phosphogypsum filling body, thereby not only improving popularization and application of phosphogypsum cemented filling technology, but also reducing cost of part of materials, and simultaneously effectively solving the problems of poor curing effect of pollution elements, high cost and the like when the cement is used as cementing agent.

Inventors

  • HUANG TAO
  • HU JUNJING
  • YANG ZIJIANG
  • YI ZHENGYANG

Assignees

  • 湖北工程学院新技术学院

Dates

Publication Date
20260512
Application Date
20260116

Claims (9)

  1. 1. A cementitious material for filling mining comprising one or more of cement, slag micropowder, steel slag and fly ash.
  2. 2. The cementing material according to claim 1, wherein the cementing material comprises, by mass, 14-42% of cement, 10-25% of slag micropowder, 17-25% of steel slag and 30-40% of fly ash.
  3. 3. The cementitious material of claim 1 wherein said cement is 32.5M portland cement.
  4. 4. The cementing material according to any one of claims 1 to 3, wherein the steel slag is solid carbon steel slag powder, and the preparation method of the solid carbon steel slag powder comprises the steps of drying the solid carbon steel slag, grinding, sieving and removing particles to obtain the solid carbon steel slag powder.
  5. 5. A cemented filling material is characterized by comprising aggregate, a cementing material and water, wherein the cementing material is the cementing material for filling mining according to any one of claims 1-4.
  6. 6. The cemented filling material according to claim 5, wherein the aggregate is modified phosphogypsum, the modified phosphogypsum is obtained by modifying phosphogypsum with a composite crystal transition agent, and the composite crystal transition agent comprises magnesium sulfate and ferric sulfate.
  7. 7. The cement filling material according to claim 6, wherein the preparation process of the modified phosphogypsum comprises the steps of taking phosphogypsum, drying at 48-52 ℃, crushing, adjusting the pH value to 6-7, heating to 140-150 ℃, adding a composite crystal transformation agent accounting for 1-2% of the weight of the phosphogypsum, and treating to obtain the modified phosphogypsum, wherein the heating rate is 0.5-1.5 ℃ per minute.
  8. 8. The method for preparing the cemented filling material according to any one of claims 5 to 7, comprising the steps of: 1) Weighing a cementing material and aggregate; 2) Mixing, adding water to prepare filling slurry, wherein the mass concentration of the slurry is 65-70%, and the glue sand ratio of the slurry is 1:3-5.
  9. 9. Use of the cemented filling material of any one of claims 5 to 7 for filling mining.

Description

Cementing material and cemented filling material for filling mining Technical Field The invention relates to the technical field of industrial building material recycling, in particular to a cementing material and a cemented filling material for filling mining. Background Phosphogypsum is an industrial byproduct generated in the process of producing phosphoric acid by a wet process of a phosphorus chemical enterprise, and the existence of pollution elements such as P, F and the like limits the recycling of the phosphogypsum, so that the problems of land occupation, environmental pollution and the like are generated. The cemented filling technology can not only relieve a series of safety problems caused by phosphogypsum stockpiling, but also provide effective support for stope roof, relieve ground subsidence and realize safe and efficient exploitation of phosphorus resources. However, when cement is used as cementing agent, the problems of poor curing effect of pollution elements, high cost and the like exist, and the popularization and application of phosphogypsum cemented filling technology are limited. Therefore, a new technology is needed to be provided, based on the physicochemical characteristics of phosphogypsum filling materials, a great amount of harmless reduction of phosphogypsum is realized, the geological disaster risks such as dam break of phosphogypsum warehouse caused by a great amount of stacking of phosphogypsum are reduced, scientific theoretical basis is provided for scientifically and effectively preventing, controlling and treating the influence of phosphogypsum filling bodies in mining areas on groundwater environment, and the technology has important theoretical significance and application value for large-scale treatment of solid wastes in goaf and groundwater environment protection. Disclosure of Invention In order to overcome the defects of the technology, the invention aims to provide a cementing material and a cemented filling material for filling mining, solve the problems of environmental pollution and the like caused by phosphogypsum stacking, effectively support and relieve surface subsidence for a stope roof and realize safe and efficient exploitation and utilization of phosphorus resources while realizing harmless reduction of phosphogypsum. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: the cementing material for filling mining is characterized by comprising one or more of cement, slag micropowder, steel slag and fly ash. The cementing material comprises, by mass, 14-42% of cement, 10-25% of slag micropowder, 17-25% of steel slag and 30-40% of fly ash. Preferably, the cement is 32.5M Portland cement. The slag micropowder is gray powder, contains a large amount of amorphous glass bodies mainly composed of CaO and Al 2O3、SiO2 and a small amount of weak crystals, has higher hydration activity, can fill gaps among phosphogypsum crystals, reduces the porosity of a cementing body, ensures that the microstructure is more compact, can interweave with phosphogypsum hydration products to form a 'crystal-particle' composite framework, reduces structural defects caused by oriented growth of phosphogypsum crystals, and improves the integrity of the cementing body. The preparation method comprises the following steps of drying the solid carbon steel slag, grinding, sieving to remove particles, and obtaining the solid carbon steel slag powder, wherein the solid carbon steel slag powder has the particle size of less than 45 mu m and the proportion of more than or equal to 7%. The cementing activity of the steel slag micropowder can be exerted to the greatest extent, and the fineness requirement of the filling cementing material is met. The steel slag can obviously improve the early strength, the cracking resistance and the environmental protection performance of the material through the synergistic effect of alkali excitation, framework enhancement and expansion adjustment in phosphogypsum cementing bodies. As a preferable scheme, the fly ash is gray black solid powder, and the main phases are mullite and quartz. The fly ash contains amorphous silicon-aluminum vitreous structures, and can form C-S-H and C-A-H gel under the alkaline excitation condition, so that the cost can be saved, and the mechanical strength can be improved by replacing part of silicate cement. The invention also provides a cementing filling material which is characterized by comprising aggregate, cementing material and water, wherein the cementing material is the cementing material for filling mining. The aggregate is modified phosphogypsum, the modified phosphogypsum is obtained by modifying phosphogypsum by adopting a composite crystal transition agent, and the composite crystal transition agent comprises magnesium sulfate and ferric sulfate. The preparation method of the modified phosphogypsum comprises the steps of taking phosphogypsum, drying at 48-52 ℃, crushi