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Red mud composite material and repairing method thereof for soil

A technology of composite materials and red mud, which is applied in the field of soil remediation, can solve the problems of unrecorded preparation method of composite red mud material ratio, drastic changes in soil properties, and difficult restoration, so as to achieve good repair effect and realize comprehensive utilization of resources , the effect of a reasonable ratio

Active Publication Date: 2015-04-29
长沙天蓝蓝环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are also some problems in this repair method, such as drastic changes in the nature of the soil itself, difficulty in recovery, and easy compaction; CN1021606 discloses a method for repairing heavy metal-contaminated soil by using granulated composite red mud, which mentions improvement through partial hydration process Red mud material, and use the improved red mud material combined with other soil amendments to improve heavy metal polluted soil
However, the patent does not clearly record the detailed material ratio of composite red mud and its preparation method, which makes this technology impossible to implement

Method used

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  • Red mud composite material and repairing method thereof for soil
  • Red mud composite material and repairing method thereof for soil
  • Red mud composite material and repairing method thereof for soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1. Red mud composite material ingredients

[0035] 78g of red mud; cement: 5g of plaster of paris, 7g of Portland cement; inorganic additives: 2g of acid-activated biochar, 6g of dipotassium hydrogen phosphate; 2g of compost, water and pore former op; the water quality is the total dry material (Red mud, cement, inorganic additives, compost) 55% of the mass, and the pore former op mass is 0.3% of the water mass.

[0036] 2. Preparation of red mud composite material

[0037] First mix the red mud with the cement, then add the aqueous solution containing the pore former op, mix and stir evenly, let it stand for 2 minutes, then add the inorganic additives and compost, mix and stir it, and let it stand for 8 minutes. Extrusion granulation in swing granulator, rotating speed 60 rpm, passing through 60 mesh sieve to obtain granularity Particles <0.250mm.

Embodiment 2

[0039] 1. Red mud composite material ingredients

[0040] 70g red mud; cement: 5g plaster of paris, 5g portland cement; inorganic additives: acid activated biochar 3g, dipotassium hydrogen phosphate 13g; compost 4g, water and pore former op, where the water quality is the total dry material (Red mud, cement, inorganic additives, compost) 52% of the mass, and the pore former op mass is 0.1% of the water mass.

[0041] 2. Preparation of red mud composite material

[0042] First mix the red mud and the cementitious material, then add the aqueous solution containing the pore former op, mix and stir evenly, let it stand for 1 minute, then add the inorganic additives and compost, mix and stir evenly, then let it stand for 5 minutes, put the mixture into Squeeze granulation in a swing granulator, rotate at 55 rpm, and pass through a 60 mesh sieve to obtain the granularity Particles <0.250mm.

[0043] The obtained particles are detected by scanning electron microscopy, such as figure 1 , fi...

Embodiment 3

[0045] 1. Red mud composite material ingredients

[0046] Red mud 60g; cementing material: plaster of paris 3g, Portland cement 5g; inorganic additives: acid activated biochar 6g, dipotassium hydrogen phosphate 18g; compost 8g, water and pore former op, where the water quality is the total dry material (Red mud, cement, inorganic additives, compost) 50% of the mass, and the pore former op mass is 0.1% of the water mass.

[0047] 2. Preparation of red mud composite material

[0048] First mix the red mud and the cementitious material, then add the aqueous solution containing the pore former op, mix and stir evenly, let it stand for 1.5 minutes, then add the inorganic additives and compost, mix and stir evenly, then let it stand for 10 minutes, put the mixture into Squeeze granulation in a swing granulator, rotate at 65 rpm, pass through a 60-mesh sieve, and get the granularity Particles <0.250mm.

[0049] In addition, using the same amount of red mud raw material and the same amount o...

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Abstract

The invention relates to a red mud composite material which comprises components in parts by weight as follows: 60-78 parts of red mud, 8-12 parts of a cementing material, 8-24 parts of an inorganic addition material, 2-8 parts of a natural fertilizer, water and a pore forming agent, wherein the mass of water is 50%-55% of total weight of the red mud, the cementing material, the inorganic addition material and the natural fertilizer, and use amount of the pore forming agent is 0.1%-0.3% of the mass of water. The invention further relates to a preparation method of the red mud composite material and a repairing method of the red mud composite material for soil polluted by heavy metal. The red mud composite material is simple in preparation process, abundant in raw material source and reasonable in proportion, so that the red mud and agricultural solid wastes are utilized sufficiently, and the comprehensive utilization of resources is achieved.

Description

Technical field [0001] The invention relates to a red mud composite material and its application, and belongs to the technical field of soil restoration. Background technique [0002] Soil heavy metal pollution is one of the most widely polluted and most harmful environmental problems in today's environmental pollution. Heavy metals in the soil have attracted much attention because of their poor mobility, long retention, and difficulty in degradation. The current status of soil heavy metal pollution in my country is very serious. The national multi-target regional geochemical survey conducted by the China Geological Survey shows that soils that account for 13% of the country’s land area are polluted. In the south, heavy metals such as cadmium, mercury, lead, and arsenic are the main problems. Heavy metal poisoning such as cadmium and mercury frequently occurs in developed and densely populated areas. Among them, soil heavy metal pollution in major industrial and mining areas in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/00
Inventor 罗琳罗惠莉刘艳田杰魏建宏李雅贞
Owner 长沙天蓝蓝环保科技有限公司
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