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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 that the preparation method of composite red mud material ratio is not clearly recorded, the soil properties change drastically, and cannot be implemented, so as to achieve good repair effect and realize comprehensive utilization of resources , the effect of a reasonable ratio

Active Publication Date: 2013-09-04
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. Ingredients for red mud composite materials

[0035] 78g of red mud; cementing material: 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-forming agent op; the water quality is the total dry material (red mud, cementing material, inorganic additives, compost) is 55% of the mass, and the op mass of the pore-forming agent is 0.3% of the water mass.

[0036] 2. Preparation of red mud composite material

[0037] First mix the red mud with the cementing material, then add the aqueous solution containing the pore-forming agent op, mix and stir evenly, let stand for 2 minutes, then add inorganic additives and compost, mix and stir evenly, let stand for 8 minutes, put the mixture into Squeeze and granulate in a swing granulator at a speed of 60 rpm and pass through a 60-mesh sieve to obtain granules with a particle size of <0.250 mm.

Embodiment 2

[0039] 1. Ingredients for red mud composite materials

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

[0041] 2. Preparation of red mud composite material

[0042] First mix the red mud with the cementing material, then add the aqueous solution containing the pore-forming agent op, mix and stir evenly, let stand for 1 minute, then add inorganic additives and compost, mix and stir evenly, let stand for 5 minutes, put the mixture into Squeeze and granulate in a swing granulator at a speed of 55 rpm, pass through a 60-mesh sieve, and obtain granules with a particle size of <0.250mm.

[0043] The resulting particles wer...

Embodiment 3

[0045] 1. Ingredients for red mud composite materials

[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-forming agent op, of which the water quality is the total dry material (red mud, cementing material, inorganic additives, compost) 50% of the mass, pore-forming agent op mass is 0.1% of the water mass.

[0047] 2. Preparation of red mud composite material

[0048] First mix the red mud with the cementing material, then add the aqueous solution containing the pore-forming agent op, mix and stir evenly, let stand for 1.5 minutes, then add inorganic additives and compost, mix and stir evenly, let stand for 10 minutes, put the mixture into Squeeze and granulate in a swing granulator at a speed of 65 rpm, pass through a 60-mesh sieve, and obtain granules with a particle size of <0.250 mm.

[0049] In addition, the same amount of red mud...

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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, belonging 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 soil have attracted much attention because of their poor mobility, long-term retention, and difficulty in being degraded. The current situation of heavy metal pollution in soil in my country is very serious. The national multi-target regional geochemical survey conducted by the China Geological Survey shows that 13% of the country's land area is 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 occurs frequently in developed and densely populated areas. Among them, heavy metal pollution in the soil of major industrial and mining areas in my c...

Claims

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Application Information

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Patent Type & Authority Applications(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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