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Method for mineralizing and cementing uranium tailing slags through montmorillonite/carbonate mineralization bacteria

A technology of carbonate and montmorillonite, which is applied in the removal of solid waste, can solve the problems of high cost and inability to solve the diffusion of radioactive elements and radon, and achieve the effect of improving the curing effect

Active Publication Date: 2020-01-17
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The treatment of uranium tailings is usually carried out by building concrete infiltration walls, general clay anti-seepage cushions and soil surface coatings, but these methods cannot well solve the long-term diffusion of radioactive elements and radon into the environment. However, the cost of implanting the uranium tailings accumulation into the electrode and in-situ heating and vitrification is too high, and it is only suitable for the accumulation of small tailings, while montmorillonite not only has a good function of absorbing radioactive elements, but also has Waterproof, airtight and cementing, curing properties

Method used

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  • Method for mineralizing and cementing uranium tailing slags through montmorillonite/carbonate mineralization bacteria

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Step 1. By using a strong alkaline nutrient solution with a pH value of 10, stress induces the carbonate mineralization strain, and selects a microwave with a microwave frequency of 2200MHZ and a power of 350W to induce the carbonate mineralization strain by microwave irradiation, and irradiates The duration is 6 minutes, from which high-efficiency carbonate mineralization strains are cultivated, and their biological properties are studied, and their physiology and biochemistry, growth and reproduction laws and culture characteristics are investigated;

[0028] Step 2. Expand the screened and domesticated high-efficiency carbonate mineralization strains in the culture solution to prepare high-concentration bacteria solution; during the cultivation process, keep the shaking table at a speed of 200 revolutions per minute and the cultivation temperature at 25 ℃, the incubation time is 24 hours. After the incubation, use a centrifuge to centrifuge the bacterial liquid at 350...

Embodiment 2

[0035]Step 1. By using a strong alkaline nutrient solution with a pH value of 10, stress induces the carbonate mineralization strain, and selects a microwave with a microwave frequency of 2200MHZ and a power of 350W to induce the carbonate mineralization strain by microwave irradiation, and irradiates The duration is 6 minutes, from which high-efficiency carbonate mineralization strains are cultivated, and their biological properties are studied, and their physiology and biochemistry, growth and reproduction laws and culture characteristics are investigated;

[0036] Step 2. Expand the screened and domesticated high-efficiency carbonate mineralization strains in the culture medium to prepare a high-concentration bacterial solution; during the cultivation process, keep the shaking table at a speed of 200 revolutions per minute and the cultivation temperature at 30 ℃, the incubation time is 24 hours. After the incubation, use a centrifuge to centrifuge the bacterial liquid at 350...

Embodiment 3

[0043] Step 1. By using a strong alkaline nutrient solution with a pH value of 10, stress induces the carbonate mineralization strain, and selects a microwave with a microwave frequency of 2200MHZ and a power of 350W to induce the carbonate mineralization strain by microwave irradiation, and irradiates The duration is 6 minutes, from which high-efficiency carbonate mineralization strains are cultivated, and their biological properties are studied, and their physiology and biochemistry, growth and reproduction laws and culture characteristics are investigated;

[0044] Step 2. Expand the screened and domesticated high-efficiency carbonate mineralization strains in the culture solution to prepare high-concentration bacteria solution; during the cultivation process, keep the shaking table at a speed of 200 revolutions per minute and the cultivation temperature at 25 ℃, the incubation time is 24 hours. After the incubation, use a centrifuge to centrifuge the bacterial liquid at 350...

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Abstract

The invention discloses a method for mineralizing and cementing uranium tailing slags through montmorillonite / carbonate mineralization bacteria. The method comprises the following steps that through stress induction and irradiation methods, carbonate mineralization strains are screened and domesticated; culture for the efficient screened and domesticated carbonate mineralization bacteria is enlarged to obtain a high-concentration bacterial solution; a test of using the carbonate mineralization bacteria to cooperate with montmorillonite for cementing the uranium tailing slags is developed, andporosity, compressive strength, permeability coefficient and radiation performance parameters of the mineralized uranium tailing slags are detected. The method for mineralizing and cementing the uranium tailing slags through the montmorillonite / carbonate mineralization bacteria has the advantages that the uranium tailing slags can be more effectively subjected to in-situ closing and cured, radon gas migration and diffusion which are caused by disintegration of harmful metal ions and radioactive elements in the uranium tailing slags are blocked from the source, and the curing effect is furtherimproved.

Description

technical field [0001] The invention belongs to the field of solidification treatment of radioactive waste, and in particular relates to a method for mineralizing and cementing uranium tailings slag by utilizing montmorillonite / carbonate mineralization bacteria. Background technique [0002] Environmental pollution has always been a huge problem faced by human beings. Among them, the pollution of the environment by the mining and smelting industry is one of the serious sources of pollution. However, to a large extent, people only pay attention to the environmental pollution caused by the smelting process, and often ignore minerals. Impact of residues on the environment. [0003] Uranium tailings are loose deposits with large porosity and poor water and air tightness. Under the leaching and percolation of atmospheric precipitation and surface diving, harmful metal ions are more likely to enter surface water and shallow groundwater or Radon produced by the decay of radioactiv...

Claims

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Application Information

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IPC IPC(8): B09B3/00B09B5/00
CPCB09B3/00B09B5/00
Inventor 竹文坤何嵘段涛杨帆陈涛李显寅
Owner SOUTHWEAT UNIV OF SCI & TECH
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