Preparation method and application of cadmium pollution soil remediation material
A technology for cadmium-contaminated soil and remediation materials is applied in the field of preparation of cadmium-contaminated soil remediation materials, which can solve the problems of high price and unfavorable promotion and use of remediation materials, and achieve the effects of convenient operation, convenient promotion and use, and low price.
Inactive Publication Date: 2018-05-04
SOUTH CHINA NORMAL UNIVERSITY
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Problems solved by technology
In recent years, many scholars use clay minerals to fix heavy metals in soil because of their advantages such as wide sources, abundant reserves, stable structure, low price, strong adsorption capacity and strong ion exchange capacity. One or several kinds of restoration materials, the stability of the restoration needs to be improved, and the price of the materials is relatively high, which is not conducive to the popularization and use of restoration materials
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Embodiment Construction
[0019] The technical solutions of the present invention will be described in detail below through specific examples, but the scope of the present invention is not limited by these examples.
[0020] Preparation of test soil
[0021] The soil was taken from a cadmium-contaminated site in a legacy factory area in Guangdong. After air-drying, it was ground and sieved. According to the determination method of the basic physical and chemical properties of soil in the national standard, the total cadmium content of the polluted soil was measured to be 31.10 mg / kg, and the soil moisture content was 12.33%. The pH value is 4.38, and the cadmium concentration in the leach solution obtained according to "HJ / T 299-2007 Solid Waste Leaching Toxic Leaching Method Sulfuric Nitric Acid Method" is 1.3083mg / L.
[0022] Preparation method of restorative material
[0023] The micron-sized hydroxyapatite and the composite material are mixed at a mass ratio of 1:0.75; the composite material is co...
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The invention discloses a preparation method and application of a cadmium pollution soil remediation material. According to the technical scheme, the preparation method of the cadmium pollution soil remediation material comprises the following steps that (1) a mineral material and a compound material are mixed according to a certain proportion; and (2) a mixed material is ground and screened. Theremediation material prepared through the method can be used for in-situ remediation of cadmium pollution soil, the process is simple, the price is low, and the repairing efficiency is high. The remediation material prepared through the method is small in grain size, large in specific surface area, free of toxic matter separation and free of secondary pollution; the mineral material selected in the preparation method is technical grade in purity, the price is low, and popularization and application are facilitated; and according to the preparation method and application, the remediation time is short, the remediation method is simple, operation is convenient, the remediation material only needs to be put into the pollution soil directly, the soil only needs to be turned over regularly, other complex devices and processes are not needed, and application and popularization in actual repairing are facilitated.
Description
technical field [0001] The invention relates to the technical field of soil remediation, in particular to a preparation method and application of a soil remediation material polluted by heavy metal cadmium. Background technique [0002] Soil is one of the main natural resources that human beings rely on for survival, but at present, the soil in my country is seriously polluted by heavy metals. According to statistics, the cultivated land polluted by heavy metals such as cadmium, arsenic, lead, chromium, and mercury in my country accounts for about five percent of the total cultivated land area. According to the "National Soil Pollution Survey Bulletin" published by the Ministry of Environmental Protection and the Ministry of Land and Resources in April 2014, the rate of cadmium pollutants exceeding the standard in the country was 7%, ranking first in the list of heavy metal pollutants. Due to the enrichment, high toxicity and refractory properties of heavy metals, heavy metal...
Claims
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Login to View More IPC IPC(8): B09C1/08C09K17/40
CPCB09C1/08B09C2101/00C09K17/40
Inventor 方战强王建乐谢仕斌
Owner SOUTH CHINA NORMAL UNIVERSITY