Unlock instant, AI-driven research and patent intelligence for your innovation.

Efficient passivation method for Cd in yellow soil

A high-efficiency technology for yellow soil, applied in the field of Cd passivation in yellow soil, can solve the problems of whether practical promotion and large-scale application are feasible, lack of plant cultivation experiment verification, and insufficient selection of passivating agents, etc., to achieve low cost, low cost, The effect of high passivation efficiency

Inactive Publication Date: 2020-10-30
GUIZHOU INST OF SOIL & FERTILIZER
View PDF5 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] (1) At present, the phytoremediation of Cd-contaminated soil is carried out by using centipede grass, but there are still problems in whether the actual promotion and large-scale application are feasible
[0008] (2) Existing Cd-contaminated soil passivation technologies often only use one, one or a small number of mixed and matched passivators to passivate Cd in the soil, the form is relatively single, and the selection of passivators is not wide enough , and the lack of plant cultivation experiment verification, the effectiveness remains to be confirmed

Method used

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
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Efficient passivation method for Cd in yellow soil
  • Efficient passivation method for Cd in yellow soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The efficient passivation method for Cd in the yellow soil provided by the embodiment of the present invention is as follows: figure 1 As shown, as a preferred embodiment, the preparation method of the Cd passivator provided by the embodiments of the present invention includes the following steps:

[0057] (1) Raw material crushing: use a hammer crusher to crush large pieces of limestone and sepiolite into stones with an average particle size of 0.5-1 cm.

[0058] (2) High-temperature calcination: Limestone, sepiolite and flux are put into the feeding bin respectively, and after being stirred by a mixer, they are transported to the rotary kiln barrel by a conveyor belt for high-temperature calcination.

[0059] (3) After calcination at a high temperature of about 1200-1300 degrees for 1.5-2.5 hours, the raw materials are transferred to the cooling system of the rotary kiln to cool for 25-35 minutes, and then the raw materials are transported to the silo to check whether...

Embodiment 2

[0067] The efficient passivation method for Cd in the yellow soil provided by the embodiment of the present invention is as follows: figure 1 As shown, as a preferred embodiment, the active silicon powder provided by the embodiments of the present invention is prepared by the following method:

[0068] Calcium hydroxide, silicon dioxide and water are mixed, the supernatant is removed by filtration after hydrothermal reaction, and the obtained precipitate is calcined to become the active silicon powder.

Embodiment 3

[0070] The efficient passivation method for Cd in the yellow soil provided by the embodiment of the present invention is as follows: figure 1 Shown, as preferred embodiment, the humus that the embodiment of the present invention provides is prepared by the following method:

[0071] 1) Collect non-polluted soil, crop stalks and manure, decompose the crop stalks, weigh the non-polluted soil and manure as required, add water and stir well, and perform high-pressure sterilization.

[0072] 2) After buffering in the channel of the solid production workshop, enter the inoculation room, add urea and EM bacteria dilution, and inoculate after cooling.

[0073] 3) After inoculation, put it into the flatbed cart on the fermentation feed tank, enter the cultivation room of each district through the buffer room, and then enter the vacuum drying workshop for drying. After the drying treatment, it is pulverized and bagged to obtain the humus.

[0074] The present invention will be further ...

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
Login to View More

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention belongs to the technical field of passivation of Cd in yellow soil, and discloses an efficient passivation method for Cd in yellow soil. The method comprises the following steps: determining the pollution level of Cd in polluted yellow soil, and uniformly spreading a Cd passivator on the surface of the polluted yellow soil according to the pollutant index of Cd in the yellow soil; then conducting rotary tillage, and irrigating the yellow soil obtained after rotary tillage; in 2-5 days after irrigation, applying a base fertilizer for balanced aging for one month, and transplantingrice; and after the rice is harvested, detecting the pollutant index of Cd in the rice and in the yellow soil for planting the rice. Alkaline substances in the selected materials can promote morphological transformation of effective-state Cd in the soil by increasing the pH value of the soil; clay minerals reduce the effective-state Cd in the soil through ion exchange adsorption and obligate adsorption; organic materials have relatively strong complexing and adsorbing effects on heavy metals and can increase the biomass of crops; and biochar can chelate heavy metal ions, so active heavy metaleffective states in the soil are reduced.

Description

technical field [0001] The invention belongs to the technical field of Cd passivation in yellow soil, and in particular relates to a high-efficiency passivation method for Cd in yellow soil. Background technique [0002] Phenomena such as mining, sewage irrigation, use of heavy metal-containing fertilizers or pesticides, and vehicle exhaust emissions have caused a substantial increase in the content of heavy metals in the soil. A large amount of accumulated heavy metals reduces the fertility of contaminated soil and reduces crop yields. It can also enter the human body through the food chain and endanger human health. Among them, the heavy metal Cd is highly toxic to the human body, and it is easy to accumulate in plants. It can enter the human body along with food, damage human organs, and cause adverse effects that are difficult to recover. In view of the fact that a large area of ​​agricultural land in my country is suffering from Cd pollution, it is of great significan...

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
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40B09C1/00B09C1/08C05G3/80C05F17/20C05F17/50C09K101/00C09K109/00
CPCB09C1/00B09C1/08C05B1/02C05B1/04C05B7/00C05B11/06C05B13/02C09K17/40C09K2101/00C09K2109/00C05F17/20C05F17/50C05G3/80C05C9/00C05D3/00C05D9/00C05D9/02C05F3/00C05F11/00Y02W30/40
Inventor 范成五罗沐欣键刘桂华柴冠群秦松胡岗
Owner GUIZHOU INST OF SOIL & FERTILIZER