Method for solidifying tailings sand based on active magnesium oxide microorganisms and products 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, high heavy metal content in tailings sand, and easy cracks on the sample surface, achieving good application prospects and reducing heavy metals The effect of ion content and strength improvement
CN110204289BActive Publication Date: 2021-10-22CHONGQING UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHONGQING UNIV
Publication Date
2021-10-22

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Abstract

The invention discloses a method for solidifying tailings sand based on active magnesia microorganisms and its products. Active magnesia is used as the basic curing agent, and microbial technology is used to provide CO required for carbonization. 2 and reduce the heavy metals in the tailings sand, making full use of the advantages of magnesium oxide solidified soil technology and microbial technology, using the carbonate ions produced by the hydrolysis of urea by Bacillus to carbonize the magnesium oxide solidified soil, improving the strength of the brick body, and using The extracellular complexation, extracellular precipitation and intracellular accumulation of heavy metals by microorganisms can reduce the content of heavy metal ions. The method has the advantages of simple process, no sintering, short construction period, high strength, environmental protection, can realize win-win of environmental benefit and economic benefit, and has good application prospect.
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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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