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CN-121991696-A - Heavy metal passivator applied to stack stabilization and oxidation resistance, use method and application

CN121991696ACN 121991696 ACN121991696 ACN 121991696ACN-121991696-A

Abstract

The invention belongs to the technical field of heavy metal passivating agents, and particularly relates to a heavy metal passivating agent applied to stack stabilization and oxidation resistance, a use method and application thereof. Compared with the prior art, the heavy metal passivating agent applied to stack stabilization and oxidation resistance provided by the invention has the advantages that heavy metal ions enter a crystal structure formed by chloroaluminate hydration products due to mineralization in the soil restoration process to form a substitutional solid solution, so that heavy metals are in a novel solidified body in a very stable form, and the toxicity to the environment is reduced. In addition, measures such as smoldering, composting fermentation and the like are adopted in the use process, so that the heavy metal replacement process can carry out strong reaction in weak base and normal temperature environment.

Inventors

  • WANG LEI
  • WANG XIAOSHU
  • LI SHAOFENG
  • WANG YANGYANG
  • LIU JIN
  • WANG JINSHENG

Assignees

  • 深圳职业技术大学

Dates

Publication Date
20260508
Application Date
20251105
Priority Date
20241105

Claims (10)

  1. 1. The heavy metal passivating agent for stack stabilization and oxidation resistance is characterized by comprising, by mass, 15-30 parts of dewatered sludge, 10-20 parts of livestock manure, 10-20 parts of biomass straw, 5-20 parts of microbial agents, 1-10 parts of steel slag, 1-10 parts of industrial solid waste, 5-20 parts of Hangzhou cotton soil, 5-15 parts of fly ash, 1-10 parts of volcanic rocks and 50-100 parts of chloroaluminate.
  2. 2. The heavy metal passivator applied to stack stabilization and oxidation resistance according to claim 1, which is characterized by comprising, by mass, 20 parts of dewatered sludge, 15 parts of livestock manure, 15 parts of biomass straw, 10 parts of microbial agents, 5 parts of steel slag, 5 parts of industrial solid waste, 10 parts of Hangzhou cotton soil, 10 parts of fly ash, 5 parts of volcanic rocks and 80 parts of chloroaluminate.
  3. 3. The heavy metal passivating agent for stack stabilization and oxidation resistance according to claim 2, wherein the microbial agent comprises a desulphurisation bacterium, a geobacillus cereus, a rhodosporidium lilacinus and a Brevibacillus laterosporus in a ratio of 2:2:1:1.
  4. 4. The application method of the heavy metal passivating agent applied to stack stabilization and oxidation resistance is characterized by comprising the following steps of: S100, adding steel slag, vesuvianite, fly ash, hangzhou cotton soil, industrial solid waste and biomass straw into a pile body, and then igniting the pile body and stewing; S200, after stewing, adding dehydrated sludge, livestock and poultry manure and microbial agents into the pile body, and then carrying out anaerobic fermentation on the pile body; And S300, after the anaerobic fermentation is completed, chloroaluminate is added into the pile body, the pile body is stirred by using a screw propeller, and then oxygen is introduced into the pile body for aerobic fermentation.
  5. 5. The method for using the stack stabilization antioxidation heavy metal passivator according to claim 4, characterized in that, in said step S100: the smoldering time is 24 hours, and a layer of ceramic fiber fireproof blanket is covered on the surface of the pile body in the smoldering process.
  6. 6. The method for using the stack stabilization antioxidation heavy metal passivator according to claim 4, characterized in that, in said step S200: The anaerobic fermentation time is 5-15d.
  7. 7. The method for using the stack stabilization antioxidation heavy metal passivator according to claim 4, characterized in that, in said step S300: The time of the aerobic fermentation is 15-30d, and the PH value of the pile body is controlled between 8 and 10 in the aerobic fermentation process.
  8. 8. The method for using the stack-stabilized antioxidation heavy metal passivator according to claim 4, wherein the steel slag, the vesuvianite, the fly ash, the Hangzhou cotton soil, the industrial solid waste and the biomass straw are ground to a particle size of not more than 20 μm before being added into the stack.
  9. 9. The application of the heavy metal passivating agent applied to stack stabilization and oxidation resistance in heavy metal soil remediation.
  10. 10. The application of a heavy metal passivator applied to stack stabilization and oxidation resistance in ore stack restoration.

Description

Heavy metal passivator applied to stack stabilization and oxidation resistance, use method and application Technical Field The invention belongs to the technical field of heavy metal passivating agents, and particularly relates to a heavy metal passivating agent applied to stack stabilization and oxidation resistance, a use method and application. Background Soil remediation is a technical measure to restore normal functions of contaminated soil, and at present, soil remediation technology is widely applied to various contaminated sites, including industrial areas, agricultural lands, residential areas and the like. The original functions of the soil can be effectively treated and restored by the restoration technology, and the threats to the ecological environment, food safety and human health are reduced. At present, a novel targeted repair technology is provided for heavy metal pollution in soil, and two environment repair materials of a silicon aluminum base and a sulfoaluminate complex salt base are constructed based on an in-phase theory, anions such as AsO 22-、AsO43-、CO32- and the like existing in a large amount under the ternary material system can easily replace part or all of SO 42- through ion exchange, enter an ettringite crystal structure to form a double salt system, and the effective fixation of heavy metal cations (Pb 2+,Cd2+ and the like) and anion groups (AsO 22-、AsO43-、CrO42- and the like) is realized based on the strong exchange binding capacity of the double salt system. This change in composition is limited to occur in the form of ion exchange in the crystal, demonstrating the molecular mechanism by which hydrated calcium chloroaluminate can effectively bind heavy metal anions and amphoteric heavy metal cations. However, this targeted repair technique requires strong alkali (PH greater than 12) and high temperature (temperature greater than 120 degrees) to perform effective heavy metal ion replacement. Therefore, it is currently an urgent matter how to invent a technology capable of performing soil-targeted repair under normal temperature and weak alkaline conditions. In view of this, the present invention has been made. Disclosure of Invention The invention aims to provide a heavy metal passivating agent applied to stack stabilization and oxidation resistance, a use method and application thereof, so as to solve the technical problems in the background art. In order to achieve one of the above objects, the present invention provides the following technical solutions: The heavy metal passivator applied to stack stabilization and oxidation resistance comprises, by mass, 15-30 parts of dewatered sludge, 10-20 parts of livestock manure, 10-20 parts of biomass straw, 5-20 parts of microbial agents, 1-10 parts of steel slag, 1-10 parts of industrial solid waste, 5-20 parts of Hangzhou cotton soil, 5-15 parts of fly ash, 1-10 parts of volcanic rocks and 50-100 parts of chloroaluminate. Preferably, the composite material comprises, by mass, 20 parts of dewatered sludge, 15 parts of livestock and poultry manure, 15 parts of biomass straw, 10 parts of microbial agents, 5 parts of steel slag, 5 parts of industrial solid waste, 10 parts of Hangzhou cotton soil, 10 parts of fly ash, 5 parts of volcanic rocks and 80 parts of chloroaluminate. Preferably, the microbial agent comprises a desulphurisation bacterium, a metal reduction geobacillus, a lilyturf-purpurea bacterium and a side spore Brevibacillus bacterium in a ratio of 2:2:1:1. In order to achieve the second purpose, the invention provides the following technical scheme: the application method of the heavy metal passivating agent applied to stack stabilization and oxidation resistance comprises the following steps: S100, adding steel slag, vesuvianite, fly ash, hangzhou cotton soil, industrial solid waste and biomass straw into a pile body, and then igniting the pile body and stewing; S200, after stewing, adding dehydrated sludge, livestock and poultry manure and microbial agents into the pile body, and then carrying out anaerobic fermentation on the pile body; And S300, after the anaerobic fermentation is completed, chloroaluminate is added into the pile body, the pile body is stirred by using a screw propeller, and then oxygen is introduced into the pile body for aerobic fermentation. Preferably, in said step S100: the smoldering time is 24 hours, and a layer of ceramic fiber fireproof blanket is covered on the surface of the pile body in the smoldering process. Preferably, in said step S200: The anaerobic fermentation time is 5-15d. Preferably, in said step S300: the time of the aerobic fermentation is 15-30d. Preferably, in said step S300: In the aerobic fermentation process, the PH value of the pile body is controlled between 8 and 10. Preferably, the steel slag, the vesuvianite, the fly ash, the Hangzhou cotton soil, the industrial solid waste and the biomass straw are ground before being added into the pile body, and the particle size