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Method for solidifying tailing sands by active magnesium oxide-based microorganisms, and product thereof

A technology of activated magnesia and tailings sand, which is applied in the field of tailings sand solidification, can solve problems such as difficulty in ensuring the uniformity of solidified samples, easy cracks on the surface of samples, and high heavy metal content in tailings sand, achieving good application prospects and environmental benefits The effect of economic benefits and short construction period

Active Publication Date: 2019-09-06
CHONGQING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are some problems in this method. CO2 is introduced into the carbonization barrel under a certain pressure. 2 , the surface of the sample is prone to cracks, and the carbonization of the sample proceeds from the surface to the inside. It is difficult to ensure the uniformity of the solidified sample, and CO 2 The operation process is relatively complicated, and it is limited in practical application, so it is not suitable for the solidification of large amounts of tailings sand.
Moreover, the heavy metal content in the tailings sand is high, so it cannot be directly used for land reclamation, construction materials, glass and ceramics, etc.

Method used

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  • Method for solidifying tailing sands by active magnesium oxide-based microorganisms, and product thereof
  • Method for solidifying tailing sands by active magnesium oxide-based microorganisms, and product thereof
  • Method for solidifying tailing sands by active magnesium oxide-based microorganisms, and product thereof

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Experimental program
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Effect test

Embodiment 1

[0029] Embodiment 1, the cultivation of bacteria

[0030] The method of bacterial culture is as follows: take Bacillus strains, after being activated by streaked plate culture, pick a single colony for preliminary expansion culture, and then inoculate it into a Erlenmeyer flask for amplified culture, and cultivate it to the logarithmic growth phase. The urease activity is 2.4mmol urea / (L·min), spare. The main components of the culture medium used by bacteria are as follows: 20g / L peptone, 10g / L urea, 5g / L sodium chloride.

Embodiment 2

[0031] Embodiment 2, the preparation of brick mold

[0032] In order to carry out the curing experiment better, a mold for making bricks from magnesia microbially solidified tailings sand was designed and processed. The box (240×115mm) and the left and right side panels (240×53mm) are evenly arranged with circular holes with a diameter of about 1.0cm, which can adjust the micro-expansion of the solidified tailings sand, and is conducive to the discharge of water and CO in the air. 2 The absorption; the internal size is 240×115×53mm (standard brick size), the assembled mold is as follows figure 1 shown. The brick-making mold adopts a combined structure, is easy to disassemble and can be used repeatedly.

Embodiment 3

[0033] Embodiment 3, the solidification of tailings sand adds

[0034] Get the bacillus 200ml that embodiment 1 cultivates, adopt activity (iodine absorption value) to be 120 active magnesium oxide 250g, add the urea solution 400ml that concentration is 3mol / L, get the tailing sand 2250g of certain manganese slag tailings pond, dry Finally, remove particles and debris with a particle size greater than 1cm; firstly mix 250g of active magnesium oxide and 2250g of tailings sand evenly, then mix and stir with urea solution, then add bacterial solution and mix evenly, then pour into the mold, and layer and compact to Design dry density 1.7g / L, let stand for 6 hours, the result is as follows figure 2 shown. After curing, the mold is removed, and the surface is polished to obtain cured tailings sand bricks, such as image 3 shown. It can be seen from the figure that the bricks after demoulding are complete and the surface is relatively smooth, and the curing condition is good, ac...

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Abstract

The invention discloses a method for solidifying tailing sands by active magnesium oxide-based microorganisms, and a product thereof. Active magnesium oxide is used as a basic solidifier, and a microbial technology is used to provide CO2 required for carbonization and reduce heavy metals in the tailing sands, so the advantages of a technology for solidifying soil with magnesium oxide and the microbial technology are fully used; carbonate ions produced by hydrolysis of urea with bacillus are used for carbonizing the magnesium oxide solidified soil, so the strength of bricks is improved; and theextracellular complexation effect, extracellular precipitation effect and intracellular accumulation effect of the microorganisms on the heavy metals are used to reduce the content of heavy metal ions. The method has the advantages of simple process, sintering avoiding, short construction period, high strength, greenness, environmental friendliness, achieving of the win-win situation of environmental benefits and economic benefits, and good application prospect.

Description

technical field [0001] The invention relates to the field of tailing sand solidification, in particular to a method for solidifying tailing sand based on active magnesium oxide microorganisms and a product thereof. Background technique [0002] Activated magnesia (MgO) is a low-carbon and environmentally friendly curing agent proposed in recent years. Carbonization and curing technology can achieve the required strength in a short time, but the curing of activated magnesia requires a large amount of CO 2 reaction. At present, in order to solve the CO required for the curing of active magnesia 2 , Liu Songyu et al. used pressure to inject CO 2 method to carbonize it. However, there are some problems in this method. CO2 is introduced into the carbonization barrel under a certain pressure. 2 , the surface of the sample is prone to cracks, and the carbonization of the sample proceeds from the surface to the inside. It is difficult to ensure the uniformity of the solidified s...

Claims

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Application Information

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IPC IPC(8): C04B28/10
CPCC04B28/105C04B2201/20C04B2201/50C04B18/12C04B24/126C04B2103/0001
Inventor 方祥位方艺霏杨阳陈哲申春妮
Owner CHONGQING UNIV
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