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Medicament for farmland heavy metal pollution treatment and preparation method thereof

A technology for pollution control and heavy metals, applied in chemical instruments and methods, restoration of polluted soil, agriculture, etc., can solve the problems of unfavorable heavy metal sealing, long-term stability, easy desorption of heavy metals, and poor treatment effect.

Pending Publication Date: 2022-08-02
武汉市秀谷科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the solidified body after cement treatment has more capillary pores, which makes the heavy metals in the solidified body easy to desorb, and the soil alkalinity after cement and lime solidification is not conducive to the long-term stability of heavy metal sealing
[0004] Moreover, for sites with compound pollution of multiple heavy metals, due to the competitive effect of various metals and other effects, the curing agent has a poor treatment effect on various heavy metals, and the leachate of the curing agent has a greater impact on the soil. The growth of agricultural crops in the soil of the farmland

Method used

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  • Medicament for farmland heavy metal pollution treatment and preparation method thereof
  • Medicament for farmland heavy metal pollution treatment and preparation method thereof
  • Medicament for farmland heavy metal pollution treatment and preparation method thereof

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preparation example Construction

[0026] The invention also provides a method for preparing a chemical for treating heavy metal pollution in farmland, which mainly includes the following steps: after mixing kaolin and sepiolite, soaking in acid solution, and after solid-liquid separation, a mixture is prepared; Mixing with lime, after sintering, mixture 2 is prepared; after sintering distiller's grains, sintering material is obtained; and then sintering material is mixed with mixture 2, after sintering, medicament is prepared.

[0027] Specifically, the kaolin clay is sieved through a 200-mesh sieve, and is set aside for use. After crushing and grinding the sepiolite, pass it through a 200-mesh sieve and set aside. The kaolin clay and sepiolite are then mixed and immersed in an acid solution for modification.

[0028] In this application, dilute hydrochloric acid solution and dilute nitric acid solution can be used for soaking the acid solution to achieve the effect of acid modification. Specifically, after ...

Embodiment 1

[0042] The purpose of this embodiment is to provide a kind of farmland heavy metal pollution control medicament, including following raw material:

[0043] Lime 8kg, kaolin 15kg, sepiolite 9kg and distiller's lees 20kg.

[0044] The steps of the preparation method of the medicament are as follows:

[0045] After mixing the kaolin and sepiolite, soak them in a dilute hydrochloric acid solution for 30 min, and stir at 30 rpm, and the pH of the dilute hydrochloric acid is 4. After soaking, centrifuge at 800 rpm for 5 minutes, and complete the solid-liquid separation to obtain mixture 1; mix mixture 1 with lime, sinter at 900 °C, sinter for 25 minutes, and keep at 750 °C. 1h, the mixture two was prepared;

[0046] After drying the distiller's grains, sintered at 140 °C for 35 minutes to obtain a sintered product; then mixed the agglomerated product with mixture 2, ground at 0.2 MPa, and then sintered at 305 °C for 15 minutes Afterwards, the medicine is prepared.

Embodiment 2

[0048] The purpose of this embodiment is to provide a kind of farmland heavy metal pollution control medicament, including following raw material:

[0049] Lime 4kg, kaolin 10kg, sepiolite 5kg and lees 30kg.

[0050] The steps of the preparation method of the medicament are as follows:

[0051] After mixing the kaolin and sepiolite, soak them in a dilute hydrochloric acid solution for 30 min, and stir at 30 rpm, and the pH of the dilute hydrochloric acid is 4. After soaking, centrifuge at 800 rpm for 5 minutes, and complete the solid-liquid separation to obtain mixture 1; mix mixture 1 with lime, sinter at 900 °C, sinter for 25 minutes, and keep at 750 °C. 1h, the mixture two was prepared;

[0052] After drying the distiller's grains, sintered at 140 °C for 35 minutes to obtain a sintered product; then mixed the agglomerated product with mixture 2, ground at 0.2 MPa, and then sintered at 305 °C for 15 minutes Then, the medicine is prepared, and the particle size of the medi...

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Abstract

The invention provides an agent for farmland heavy metal pollution treatment and a preparation method thereof, and relates to the technical field of soil remediation and treatment. The medicament mainly comprises the following raw materials: lime, kaolin, sepiolite and vinasse. According to the invention, the biochar prepared from vinasse is used as a main porous substance, so that the biochar has a relatively good adsorption effect on heavy metals, and lime, kaolin and sepiolite can be compounded, so that the competitive effect of various heavy metals is reduced, and the passivation effect of heavy metals in farmland soil is improved. Meanwhile, the lime and the kaolin have viscosity, so that the molecular interaction between the lime and the kaolin and the vinasse biochar is relatively strong. In addition, according to the preparation method of the agent, acid modification and sintering are mainly adopted, after minerals are modified through acid liquor, the passivation effect of the agent is enhanced, then after mixing, sintering is conducted under the high-temperature condition, the combination effect of the raw materials is good, and the passivation effect of the agent can be further improved.

Description

technical field [0001] The invention relates to the technical field of soil remediation and treatment, in particular to a chemical for treatment of heavy metal pollution in farmland and a preparation method thereof. Background technique [0002] For soil heavy metal pollution, commonly used remediation technologies include: physical remediation technology, chemical remediation technology, bioremediation technology and joint remediation technology. Among the many remediation technologies, physical remediation such as thermal desorption, soil replacement, and electrical remediation damages the soil structure, which requires a large amount of engineering and high cost; bioremediation has a long cycle and high requirements for soil environment. The fixation / stabilization repair technology in chemical repair has received extensive attention due to its short time and good stability. The solidification / stabilization technology (S / S technology for short) uses the physical and chemi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/08B09C1/00B09C1/08C09K101/00
CPCC09K17/08B09C1/00B09C1/08C09K2101/00Y02A50/30
Inventor 冯才声舒海啸徐聪柯金鹏黄学顺许伟颜晶晶
Owner 武汉市秀谷科技有限公司
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