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Mineral-organic composite soil conditioner and preparation method thereof

A technology of soil conditioner and mineral powder, which is applied in the fields of agriculture and environmental protection. It can solve the problems of large environmental impact, high input cost, and high requirements for equipment and equipment, and achieve the effect of soil improvement, low cost, and no secondary pollution.

Pending Publication Date: 2020-05-01
HEBEI NORMAL UNIV FOR NATTIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The purpose of this method is to produce soil heavy metal passivators. Although it can play the role of passivating heavy metals, the materials used in the preparation process, such as formaldehyde, have a greater impact on the environment, higher requirements for equipment, and higher input costs.

Method used

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  • Mineral-organic composite soil conditioner and preparation method thereof
  • Mineral-organic composite soil conditioner and preparation method thereof
  • Mineral-organic composite soil conditioner and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Use corn stalks as biomass raw materials, cut the stalks into small pieces with a length of 5-20cm and a width of 0.5-5cm, put them into a pyrolysis furnace for pyrolysis, the heating rate is 10-20°C / min, and the pyrolysis temperature is 500 -600°C, the pyrolysis time is 40-60min, and the generated biochar is crushed and sieved (100 mesh) to make a biochar powder sample. Industrial analysis of corn stalks and corn stalk charcoal (see Table 1) shows that after pyrolysis, the moisture content of corn stalks decreases, the ash content increases, the volatile matter decreases significantly, and the fixed carbon content increases significantly.

[0030] Table 1 Industrial analysis of corn stalks and the resulting corn stalk charcoal

[0031]

Embodiment 2

[0033] Biochar, lime, zeolite, and montmorillonite were used as raw materials, crushed and sieved, mixed evenly according to different mass ratios, and compounded into four different soil conditioners, as shown in Table 2, respectively A, B, C , D stands for. Select the surface soil of a polluted farmland (the soil pH value is 5.71, the available cadmium content is 0.92 mg / kg, and the available lead content is 29.1 mg / kg), and it is naturally air-dried in a cool indoor place. 100 mesh sieve. Accurately weigh 50g of soil and place it in a beaker, fully mix the conditioners of different formulations with the soil according to a certain addition ratio (0.5%, 1%, 3%, 5%), and repeat each treatment 3 times, with blank As a control, a certain amount of deionized water was added to make the soil water content reach 60% of the maximum water holding capacity in the field, and it was cultivated indoors (above 20° C.) with ventilation, and analyzed and measured after 30 days. Water was...

Embodiment 3

[0043]Select the soil conditioner prepared according to 40% biochar, 30% zeolite, 10% montmorillonite, 20% lime formula to detect the heavy metal content. The screening value in the Standard for Soil Pollution Risk Control of Agricultural Land (Trial) (GB 15618-2018) (5.5<pH≤6.5) can be used for soil remediation and improvement.

[0044] Heavy metal content (mg / kg) in table 6 soil conditioner

[0045]

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Abstract

The invention discloses a soil conditioner and a preparation method thereof. The soil conditioner comprises 40%-80% of charcoal powder, 0-30% of zeolite powder, 0-30% of lime powder and 10%-20% of montmorillonite powder.

Description

technical field [0001] The invention relates to the fields of agriculture and environmental protection, in particular to a method for producing a soil conditioner by using minerals and waste biomass as raw materials. content, promote crop growth, and ensure food security. Background technique [0002] In recent years, due to the discharge of three industrial wastes and the long-term unreasonable application of chemical fertilizers and pesticides, etc., my country's cultivated land has been seriously degraded. Problems such as soil compaction, heavy metal pollution such as cadmium and lead, and secondary salinization have become increasingly prominent, seriously affecting the sustainable development of agriculture. , a threat to food security. Due to the complex causes of heavy metal pollution, the difficulty of treatment, the great harm, and the complex occurrence of other degradation problems, related treatment and restoration technologies have always been a research hotspo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/04C09K17/08B09C1/08C05G3/80C05G5/12C09K101/00
CPCB09C1/08C05D3/00C09K17/04C09K17/08C09K2101/00
Inventor 薛忠财柳洁刘海宽王晓远
Owner HEBEI NORMAL UNIV FOR NATTIES
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