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Curing agent special for Bayer process red mud roadbeds and preparation method and application method thereof

A Bayer process red mud and curing agent technology, which is applied in solid waste management, sustainable waste treatment, climate sustainability, etc. It has the advantages of easy popularization and application, low cost and simple preparation method.

Active Publication Date: 2016-06-22
山东海逸生态环境保护有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing traditional curing agent cannot effectively reduce the pH value and pollution of red mud, and the long-term stability is poor
If there is no suitable red mud solidification material, it will seriously restrict the large-scale application of red mud in the road industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 【formula】

[0041] Phosphogypsum 75KgCaCl 2 20Kg

[0042] Slag fine powder 4KgBaCl 2 1Kg

[0043] 【Preparation】

[0044] a) Dry the phosphogypsum with the formulated amount at 100-110°C for 6 hours, grind it with a ball mill and pass it through a 100-mesh sieve for later use;

[0045] b) Add the recipe amount of CaCl 2 After drying the slag fine powder at 65°C for 6 hours, add the phosphogypsum prepared in step a, fully mix and grind, and obtain a mixture with a pH value of 6;

[0046] c) At room temperature, the formula amount of BaCl 2 Add it into the mixture described in step b, and mix well to obtain the finished curing agent.

[0047] 【Application and effect】

[0048] The curing agent prepared above is mixed evenly with 10% of the red mud above the optimum water content of 2 percentage points, and molded and maintained. The unconfined compressive strength after 7 days was 1.5MPa, and the pH value of the red mud specimen decreased to 8.9.

Embodiment 2

[0050] 【formula】

[0051] Phosphogypsum 70KgCaCl 2 24Kg

[0052] Slag fine powder 4.8KgBaCl 2 1.2Kg

[0053] 【Preparation】

[0054] The preparation method is the same as in Example 1.

[0055] 【Application and effect】

[0056] The application method is the same as the first embodiment.

[0057] The unconfined compressive strength after 7 days was 1.2MPa, and the pH value of the red mud specimen decreased to 9.3.

Embodiment 3

[0059] 【formula】

[0060] Phosphogypsum 80KgCaCl 2 16Kg

[0061] Slag fine powder 3.2KgBaCl 2 0.8Kg

[0062] 【Preparation】

[0063] The preparation method is the same as in Example 1.

[0064] 【Application and effect】

[0065] The application method is the same as the first embodiment.

[0066] The unconfined compressive strength after 7 days was 1.4MPa, and the pH value of the red mud specimen decreased to 8.5.

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PUM

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Abstract

The invention discloses a curing agent special for Bayer process red mud roadbeds and a preparation method and application method thereof, and belongs to the field of road engineering. The curing agent is formed by mixing industrial residue ardealite, modifier and stabilizer according to a certain ratio, curing of red mud is achieved through the chemical characteristic that solid wastes supplement one another and through stimulation of active materials, and therefore red mud is used for highway roadbed filling projects. The curing agent has the advantages of being free of secondary pollution, low in cost, simple in preparation method and high in resource utilization rate.

Description

technical field [0001] The invention relates to the field of road engineering, in particular to a special curing agent for Bayer process red mud roadbed, its preparation method and application method. Background technique [0002] Red mud is the solid waste that is discharged from the extraction of alumina from bauxite. Generally, it contains a large amount of iron oxide, and its appearance is similar to red soil, hence the name. Generally, for every ton of alumina produced, 0.8-1.5 tons of red mud will be produced. In 2014, the national production of red mud was about 80 million tons, and the utilization was about 3.2 million tons, with a utilization rate of 4%. 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. Therefore, it is imminent to minimize the stockpiling and harm of red mud and real...

Claims

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Application Information

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IPC IPC(8): C04B20/02C04B18/04
CPCY02W30/91C04B18/0409C04B20/023
Inventor 程钰孙兆云韦金城
Owner 山东海逸生态环境保护有限公司
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