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A kind of red mud granular soil remediation agent and preparation method thereof

A technology of soil remediation agent and red mud, which is applied in the direction of soil conditioning materials, chemical instruments and methods, and other chemical processes, can solve the problems of excessive soil pH rise, achieve good mechanical strength, overcome the rapid rise of soil pH, and high Effect of application value and environmental benefits

Inactive Publication Date: 2018-08-24
国家电投集团山西铝业有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The red mud granular material can continuously stabilize heavy metals through slow release, and can be used to passivate heavy metal ions such as lead and zinc in polluted soil, which is conducive to promoting the chemical form transformation of heavy metal ions in polluted soil. More importantly, it can effectively Solve the problem of rapid rise in soil pH and realize in-situ remediation of farmland soil contaminated by heavy metals

Method used

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  • A kind of red mud granular soil remediation agent and preparation method thereof
  • A kind of red mud granular soil remediation agent and preparation method thereof
  • A kind of red mud granular soil remediation agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The property analysis of embodiment 1 red mud

[0050] 1. Image analysis of red mud

[0051] In this example, the waste red mud produced by the Bayer process of China Power Investment Shanxi Aluminum Co., Ltd. to produce alumina is used for research. The XRD pattern of the red mud is shown in the attached figure 1 As shown, the main minerals in red mud are calcite (CaCO 3 ), diaspore (AlO(OH)), calcium aluminosilicate (CaAl 2 o 2 Si 8 ), calcium silicate hydrate (Ca 3 Si 2 o7 1.5H 2 O), hemimorphite (Zn 4 Si 2 o 7 ·H 2 O) etc. Among these substances, calcite and hemimorphite are diamond-shaped crystal planes, which are the main skeleton and can play a certain role in gelling; while diaspore and calcium silicate mainly play a role in filling and gelling in the skeleton. effect.

[0052] 2. Chemical composition of red mud

[0053] The chemical composition of red mud depends on the composition of bauxite, the method of producing alumina and the composition of...

Embodiment 2

[0062] Example 2 Research on gelation modification of red mud

[0063] The present invention selects similar Portland cement, gypsum, fly ash and other materials in order to improve the gelling ability of the red mud. After a lot of research and screening, we finally selected gypsum, cement and fly ash as the cementitious and modified materials.

[0064] 1. Gelation properties of raw materials

[0065] As described in Example 1, the red mud itself has a certain gelling performance, but it is weak and the initial setting time is relatively long. Further research on its gelling properties: the red mud was air-dried and crushed through a 60-mesh sieve, sealed and stored for later use. According to the gray water ratio of 1:2.5, the pH is 12.36. In order to measure the gelling property of red mud raw material and facilitate subsequent granulation experiments, the self-gelling time of each sample was tested with water-cement ratios of 0.5 and 0.6. See Table 2 for relevant data....

Embodiment 3

[0088] Example 3 The impact of cementitious materials compounding on the gelling performance of red mud

[0089] 1. The influence of cement and fly ash on the gelling properties of red mud

[0090] (1) As can be seen from the above research results, cement and fly ash have the most significant effect on improving the gelling performance of red mud. In order to further explore a better scheme for improving the gelling performance of red mud, the present invention also studies cement and fly ash The effect of compound combinations on the gelling performance of red mud.

[0091] (2) According to the same method, by adding 10% cement and fly ash in different ratios, study its influence on the gelling performance of red mud. The gel properties of samples with different ratios are shown in Table 7.

[0092] Table 7 Improvement of red mud gelling performance by cement and fly ash compound

[0093]

[0094] From the comparison of Table 7, Table 5, and Table 6, it can be seen tha...

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Abstract

The invention discloses red mud particle soil repairing adhesives and a preparation method and application thereof. The red mud particle soil repairing adhesives are prepared through a series of steps of water adding, mixing, ball forming, room-temperature drying and solidifying by using red mud as the raw material, mixing gypsum into the red mud and using binding material Portland cement and powdered coal in a compound mode to achieve the synergistic interaction result and remarkably improve the red mud gelling property. Red mud powder is granulated and prepared at a room temperature, the obtained red mud particle soil repairing adhesives have certain mechanical strength and quite good heavy metal stabile solidifying performance, soil or mud polluted by heavy metal can be effectively treated, and meanwhile OH radical ions can be slowly released; the pH of soil is kept between 6.7 and 8.1 after soil is repaired through the repairing adhesives, the problems that when soil is repaired through red mud powder, the pH of soil rises too fast and plant growth is not facilitated can be effectively solved, and high application value and environment benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of soil heavy metal pollution control. More specifically, it relates to a red mud granular soil repair agent and a preparation method thereof. Background technique [0002] Red mud is the residue produced in the process of alumina production. It is rich in oxides of iron, aluminum and calcium, which can reduce the solubility and bioavailability of metals. It can continuously stabilize and solidify heavy metals in the soil by releasing OH ions. Promote the transformation of chemical forms of heavy metals in polluted soil, and can be used as a stable solidifying agent for heavy metal polluted soil. [0003] However, at present, when red mud is used in pollution control and ecological restoration, red mud powder is basically used directly. Due to the rapid release of free alkali, the soil pH rises rapidly, causing serious harm to vegetation and soil microorganisms. [0004] Therefore, how to reduce the releas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/40C09K109/00
Inventor 赵光利石太宏王新璋陈惠康徐源柴洪云汤叶涛程乾坤张红云黄雄飞
Owner 国家电投集团山西铝业有限公司
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