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CN-122010523-A - Phosphogypsum-based vegetation concrete and preparation method thereof

CN122010523ACN 122010523 ACN122010523 ACN 122010523ACN-122010523-A

Abstract

The invention provides phosphogypsum-based vegetation concrete and a preparation method thereof, and belongs to the technical field of building materials. The slow-release fertilizer comprises 60-80 parts of red mud, 20-40 parts of mineral powder, 30-40 parts of water and 2-5 parts of monoammonium phosphate, 150-200 parts of phosphogypsum, 10-20 parts of cement, 10-20 parts of mineral powder and 20-25 parts of silica fume, and 20-30 parts of plant ash, 10-15 parts of sodium alginate and 8-12 parts of water. The high-pore structure of the cementing material provides a channel for nutrient diffusion, the slow-release fertilizer particles wrapped by sodium alginate accurately control the nutrient release rate, and phosphogypsum aggregate adsorbs partial nutrients through micropores of the phosphogypsum aggregate to further delay nutrient release and achieve the effect of promoting plant growth for a long time.

Inventors

  • LI ZHAOFENG
  • YANG JIANWU
  • DENG JINGJING
  • SUN KEKE
  • ZHANG JIAN
  • GAO YIFAN
  • YANG HUIKAI
  • PENG XIAOGUANG
  • LIN JIUQING
  • LIU CHAOFENG

Assignees

  • 山东大学
  • 华润水泥(合浦)有限公司

Dates

Publication Date
20260512
Application Date
20260312

Claims (10)

  1. 1. The phosphogypsum-based plant-grown concrete is characterized by comprising 110-170 parts of cementing materials, 190-270 parts of aggregates and 75-110 parts of slow release fertilizer particles in parts by weight; The cementing material comprises 60-80 parts of red mud, 20-40 parts of mineral powder, 30-40 parts of water and 2-5 parts of monoammonium phosphate, the raw materials of the aggregate comprise 150-200 parts of phosphogypsum, 10-20 parts of cement, 10-20 parts of mineral powder and 20-25 parts of silica fume, and the raw materials of the slow-release fertilizer particles comprise 40-50 parts of phosphogypsum, 20-30 parts of plant ash, 10-15 parts of sodium alginate and 8-12 parts of water.
  2. 2. The phosphogypsum-based plant-grown concrete of claim 1, wherein the aggregate particle size is 15-30 cm.
  3. 3. The phosphogypsum-based plant-growing concrete of claim 1, wherein the particle size of the slow release fertilizer particles is 1-2 mm.
  4. 4. Phosphogypsum-based plant-grown concrete according to claim 1, characterized in that the red mud is selected from one or more of bayer process red mud, sintering process red mud and combined process red mud; Or the mineral powder is one or more of S75 mineral powder, S95 mineral powder and S105 mineral powder.
  5. 5. The phosphogypsum-based plant concrete of claim 1, wherein the phosphogypsum is one or more selected from the group consisting of dihydrate phosphogypsum, hemihydrate phosphogypsum and anhydrous phosphogypsum; or, the cement is ordinary silicate cement; or the silica fume is micro silica fume.
  6. 6. A method for preparing phosphogypsum-based plant concrete according to any one of claims 1 to 5, comprising the steps of: S1, after dry mixing red mud and mineral powder in a cementing material raw material, adding water and ammonium dihydrogen phosphate, and stirring to obtain a cementing material; S2, dry-mixing phosphogypsum, cement, mineral powder and silica fume in the raw materials of the aggregate, and granulating to obtain the aggregate; S3, mixing and stirring phosphogypsum, plant ash and sodium alginate in the slow-release fertilizer particles, spraying water in the mixing and stirring process, granulating the wetted mixture, and drying to obtain slow-release fertilizer particles; and S4, mixing and stirring the cementing material, the aggregate and the slow-release fertilizer particles to obtain the phosphogypsum-based vegetation concrete.
  7. 7. The method for preparing phosphogypsum-based plant-grown concrete according to claim 6, wherein in S1, the dry mixing time is 1-2 min, and the mixing time is 2-3 min.
  8. 8. The method for preparing phosphogypsum-based plant-grown concrete according to claim 6, wherein in S2, the dry mixing time is 3-5 min, and curing is performed for more than 1d after granulation by an wet granulator.
  9. 9. The method for preparing phosphogypsum-based plant-grown concrete according to claim 6, wherein in S3, the mixing and stirring time is 1-5 min, and the drying method is that the phosphogypsum-based plant-grown concrete is subjected to ventilation drying at 50-60 ℃ for 30-50 min.
  10. 10. The method for preparing phosphogypsum-based plant-grown concrete according to claim 6, wherein in S4, the stirring time is 15-30S, and then the phosphogypsum-based plant-grown concrete is obtained by molding.

Description

Phosphogypsum-based vegetation concrete and preparation method thereof Technical Field The invention belongs to the technical field of building materials, and particularly relates to phosphogypsum-based vegetation concrete and a preparation method thereof. Background The disclosure of this background section is only intended to increase the understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art already known to those of ordinary skill in the art. The mining of mineral resources results in the appearance of a large number of abandoned mines, and the ecological restoration method of the abandoned mines mainly comprises the modes of foreign soil backfilling, organic fertilizer adding and the like, the polluted or barren original soil is removed, the original soil is replaced by the fertilizer foreign soil from an external source, and the soil matrix is quickly restored by assisting straws, livestock manure, biogas residues and the like, so that the quick restoration of plants and organisms is realized. The traditional fertilizer has the problems of low nutrient utilization rate due to the characteristics of high solubility, high release speed and the like, only a small amount of nutrients are absorbed and utilized by plants, and most other nutrients are lost through leaching, volatilization and other ways and enter the water environment, so that the environmental problems of soil, water eutrophication and the like are finally caused. The slow release fertilizer has the remarkable advantages of high nutrient utilization rate, economy, environmental protection, strong adaptability, ecological protection and the like. But also has the defects of higher cost (30% -50% more expensive than the traditional fertilizer), easy influence of temperature and humidity on release rate, difficult degradation of part of coating materials and the like, and also has the limitations on crop suitability and soil applicability, and the problems of micro-plastic pollution or uneven nutrient release and the like can be caused. How to develop a slow release fertilizer based on solid waste resources of a waste mine and apply the slow release fertilizer to ecological restoration of the waste mine is a problem which needs to be solved by a person skilled in the art. Disclosure of Invention Based on the current state of the art, the invention aims to provide phosphogypsum-based plant-growing concrete and a preparation method thereof, and the phosphogypsum-based fertilizer-effect slow-release plant-growing concrete prepared by taking industrial solid waste as a raw material comprises solid waste-based cementing material, artificial aggregate and slow-release fertilizer, so that the industrial solid waste recycling is realized, and the material cost is greatly reduced. In order to achieve the above purpose, the technical scheme of the invention is as follows: the invention provides phosphogypsum-based plant-grown concrete, which comprises, by weight, 112-175 parts of a cementing material, 190-270 parts of aggregate and 75-110 parts of slow-release fertilizer particles; The cementing material comprises 60-80 parts of red mud, 20-40 parts of mineral powder, 30-40 parts of water and 2-5 parts of monoammonium phosphate, the raw materials of the aggregate comprise 150-200 parts of phosphogypsum, 10-20 parts of cement, 10-20 parts of mineral powder and 20-25 parts of silica fume, and the raw materials of the slow-release fertilizer particles comprise 40-50 parts of phosphogypsum, 20-30 parts of plant ash, 10-15 parts of sodium alginate and 8-12 parts of water. In a second aspect of the present invention, there is provided a method for preparing the phosphogypsum-based vegetation concrete, comprising the steps of: S1, after dry mixing red mud and mineral powder in a cementing material raw material, adding water and ammonium dihydrogen phosphate, and stirring to obtain a cementing material; S2, dry-mixing phosphogypsum, cement, mineral powder and silica fume in the raw materials of the aggregate, and granulating to obtain the aggregate; S3, mixing and stirring phosphogypsum, plant ash and sodium alginate in the slow-release fertilizer particles, spraying water in the mixing and stirring process, granulating the wetted mixture, and drying to obtain slow-release fertilizer particles; and S4, mixing and stirring the cementing material, the aggregate and the slow-release fertilizer particles to obtain the phosphogypsum-based vegetation concrete. The beneficial effects of the invention are as follows: The phosphogypsum-based plant-growing concrete provided by the invention constructs a three-in-one slow-release synergistic system of a cementing material, a slow-release fertilizer and an aggregate, wherein a high-pore structure of the cementing material provides a channel for nutrient diffusion, slow-release fertilizer particles wr