Soil heavy metal composite passivator with humic acid minerals and preparation method thereof

The technology of humic acid mineral powder and humic acid is applied in dryland soil, the preparation of soil heavy metal composite passivator, and the field of soil heavy metal composite passivator. It can improve the organic matter content and cation exchange capacity, in-situ passivation of soil heavy metals, and simple preparation methods.
CN102220136AActive Publication Date: 2011-10-19INST OF SUBTROPICAL AGRI CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
INST OF SUBTROPICAL AGRI CHINESE ACAD OF SCI
Publication Date
2011-10-19

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Abstract

The invention discloses a soil heavy metal composite passivator with humic acid minerals and a preparation method thereof. The soil heavy metal composite passivator is prepared by humic acid mineral powder, fused calcium magnesium phosphate and quick lime according to a certain proportion. The preparation method comprises the following steps: A, preparing the humic acid mineral powder: taking humic acid raw ore, carrying out ball-milling to the humic acid raw ore, and sieving the humic acid raw ore by a 110-140-mesh sieve for standby; and B, uniformly mixing the raw material prepared in the step A, fused calcium magnesium phosphate and quick lime, adjusting the water content of the mixture to be 10% counting by H2O, and stacking the mixture for five-seven days to obtain the soil heavy metal composite passivator with the humic acid minerals, so that the operation is simple and the method is easy to implement. By the invention, the available cadmium content of red sand mud soil with thefull-cadmium content of 10mg / kg (by exogenous adding) is reduced by 0.36-2.25mg / kg within ninety-day culture time, the reduction amplitude reaches up to 4.7-25.7%, the efficiency of the soil heavy metal composite passivator with the humic acid minerals under a water condition of 45% WHC (Water-holding Capacity) is better than that under a flooded condition, and the soil heavy metal composite passivator with the humic acid minerals also has the functions of passivating heavy metal in soil, soil fertility and the like and has significant popularization and application values in vast heavy metalpollution regions.
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Description

technical field

[0001] The invention belongs to the technical field of agricultural environment conservation and restoration, and more specifically relates to a soil heavy metal composite passivator containing humic acid minerals, and also relates to a preparation method of a soil heavy metal composite passivator containing humic acid minerals. It is suitable for all kinds of soils polluted by heavy metals, especially dryland soils. Background technique

[0002] With the rapid development of industry and the continuous increase of agricultural input intensity, a large number of heavy metals and other pollutants have entered the soil environment, which has caused heavy metal pollution in soil and has become a worldwide problem that has been widely concerned. Heavy metals in soil can be absorbed by plants and enter the food chain, posing a serious threat to human health. According to reports, the area of ​​cultivated land polluted by heavy metals such as cadmium, lead, mercur...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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