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Microbiological consolidation method and application method of bayer process red mud roadbed

A technology of Bayer process red mud and solidification method, applied in the field of road engineering, can solve the problems of small cumulative speed effect, high investment, low production efficiency, etc., and achieve the effect of good biocompatibility and low energy consumption

Inactive Publication Date: 2018-06-22
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] Technical issues: The existing red mud treatment technology is mainly based on dry storage, chemical or metallurgical methods, and as iron cement raw materials. These methods have serious environmental pollution, high investment, low production efficiency, large investment, high energy consumption, and high cost. It is difficult to carry out large-scale treatment of red mud due to technical problems such as high and ineffective industrial application at all. Compared with the cumulative speed of tens of millions of tons of red mud per year, it has little effect

Method used

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  • Microbiological consolidation method and application method of bayer process red mud roadbed
  • Microbiological consolidation method and application method of bayer process red mud roadbed

Examples

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Embodiment 1

[0044] In this example, the Bayer red mud roadbed microbial solidification method and application method are used to treat the red mud roadbed, and the method includes the following steps:

[0045]Use red mud 6 as roadbed filling material (such as roadbed, base and subbase filling materials) for construction, and lay a red mud layer with a thickness of about 30cm; after laying, perform mechanical plowing on the red mud layer to be treated; Tilling while spraying OD 600 =1.2 Bacillus pasteurian bacteria liquid; so repeated many times, until the thickness of the red mud foundation 6 reaches 1.5m;

[0046] a. Vertically drive the grouting flower tube 1 into the red mud foundation 6;

[0047] b. Through the grouting flower tube 1, first inject the nutrient solution 3① of 1.5 times the pore volume of the soil to be solidified into the red mud to be solidified 7, and then inject urea with a concentration of 1.0 mol / L and 1.0 mol / L equal to the volume of the nutrient solution 3①. m...

Embodiment 2

[0051] In this example, the Bayer red mud roadbed microbial solidification method and application method are used to treat the red mud roadbed, and the method includes the following steps:

[0052] Use red mud 6 as roadbed filling material (such as roadbed, base and subbase filling materials) for construction, and lay a red mud layer with a thickness of about 50cm; after laying, perform mechanical plowing on the red mud layer to be treated; Tilling while spraying OD 600 =1.2 Bacillus pasteurian bacteria liquid; so repeated many times, until the thickness of the red mud foundation 6 reaches 3m;

[0053] a. Vertically drive the grouting flower tube 1 into the red mud foundation 6;

[0054] b. Through the grouting flower tube 1, first inject an OD of 1.5 times the pore volume of the soil to be consolidated into the red mud to be consolidated 7 600 =1.2 of the Bacillus pasteurian bacteria liquid 3②, and then inject the same volume as the bacteria liquid 3② of urethra with a conc...

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Abstract

The invention discloses a processing method and application method of a bayer process red mud roadbed, and belongs to the field of road engineering. The method comprises the following steps: fully mixing the paved bayer process red mud roadbed with microbiological bacterial liquid containing bacillus pasteurii according to a certain proportion in a way of mechanical plowing; supplying nutrient liquid and consolidating fluid to red mud in a way of several rounds of grouting. According to the processing method and application method of the bayer process red mud roadbed disclosed by the invention, the ways of mechanical plowing and grouting are innovatively adopted, so that three of the bacillus pasteurii, the red mud and the consolidating fluid are fully mixed and contact with each other; red mud particles are filled with calcium carbonate crystal produced by the bacillus pasteurii in pores of the red mud in a cementing manner, so that consolidation on the red mud is realized; the consolidated red mud can be used for roadbed filling engineering, and has the characteristics of no secondary pollution, low cost, simpleness in preparation method and high resource utilization ratio. In addition, the method disclosed by the invention also has the advantages that harmful components such as heavy metal in the red mud also can be consolidated, and multi-channel large-scale resource utilization of the red mud can be realized.

Description

technical field [0001] The invention relates to a microbial solidification method and an application method of Bayer method red mud roadbed, belonging to the field of road engineering. Background technique [0002] Red mud is a red muddy strong alkaline solid waste with high water content that remains after alumina is produced from bauxite through various physical and chemical treatments. Its output varies with ore grade, production method and technical level. Generally speaking, 0.8-1.5 tons of red mud are produced for every ton of alumina produced. At present, the cumulative stockpiling of red mud in my country exceeds 350 million tons. The large stockpiling of red mud not only occupies land, wastes resources, but also easily causes environmental pollution and safety hazards. According to statistics, as of the end of 2016, the annual discharge of red mud has exceeded 80 million tons, and the accumulated stockpiles have exceeded 352 million tons, while the utilization amo...

Claims

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Application Information

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IPC IPC(8): C09K17/14E01C3/04E02D3/12C09K103/00
CPCC09K17/14C09K2103/00E01C3/04E02D3/12
Inventor 刘鹏程钰邵光辉
Owner NANJING FORESTRY UNIV
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