Method for preparing ceramsite through microwave sintering and curing of heavy metal chromium

A microwave sintering and heavy metal technology, applied in applications, household appliances, ceramic products, etc., can solve the problems of long effective time, incomplete curing, incomplete treatment, etc., to achieve good sintering quality, avoid uneven heating, and improve curing efficiency. Effect

Inactive Publication Date: 2017-11-17
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Physical remediation is generally incompletely solidified and difficult to eradicate; chemical remediation projects often need to invest more reducing agents than the theoretical value, causing secondary pollution; bioremediation is the use of plants or microorganisms to absorb, transform, and remove pollutants. Bioremediation is a remediation technology that removes pollutants in the soil by degradation. The bioremediation method is safe and low in cost, but it has disadvantages such as long effective time and incomplete treatment.
[0004] In recent years, some achievements have been made in the research on the control and treatment of chromium-contaminated soil at home and abroad. For example, Chinese invention patent 201110206407.6 provides a method for producing ceramsite by sintering high-chromium-contaminated soil, but it uses conventional sintering methods to consume energy Larger, the sintering rate is slower, and the chromium in the product ceramsite is still hexavalent chromium, which does not fundamentally reduce its toxicity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Using microwave sintering to solidify heavy metal chromium to prepare ceramsite, the method is as follows:

[0025] 1) Chromium-contaminated soil sample: take the polluted soil near a chemical plant, the chromium content in this soil is 1453.44mg / kg;

[0026] 2) Treatment of chromium-contaminated soil: Weigh the chromium-contaminated soil sample and dry it in a drying box for 3 hours, then cool the chromium-contaminated soil to room temperature, and put the powder in a ceramic ball mill for 30 minutes until the 100-mesh sieve remains ≤ 15%;

[0027] 3) Mixed aging: add water to the treated soil in step 2) with graphite powder, iron oxide, aluminum powder, and potassium feldspar in a mass ratio of 82:5:5:2:5 (the mass of water is 10% of the total mass of solids) ) mixed evenly, and aged for 24 hours to make ceramsite blank;

[0028] 4) Sintering: Put the ceramsite blank obtained in step 3) into a microwave sintering furnace (output frequency is 2450±50MHz, output power ...

Embodiment 2

[0031] Using microwave sintering to solidify heavy metal chromium to prepare ceramsite, the method is as follows:

[0032] 1) Chromium-contaminated soil sample: take the polluted soil near a chemical plant, the chromium content in this soil is 1453.44mg / kg;

[0033] 2) Treatment of chromium-contaminated soil: Weigh the chromium-contaminated soil sample and dry it in a drying box for 3 hours, then cool the contaminated soil to room temperature, and put the powder in a ceramic ball mill for 30 minutes until the 100-mesh sieve remains ≤ 15%;

[0034] 3) Mixed aging: add water to the treated soil in step 2) with graphite powder, iron oxide, aluminum powder, and potassium feldspar at a mass ratio of 80:5:3:2:7 (the mass of water is 8% of the total solid mass) ) mixed evenly, and aged for 24 hours to make ceramsite blank;

[0035] 4) Sintering: Put the ceramsite blank obtained in step 3) into a microwave sintering furnace (output frequency is 2450±50MHz, output power 12KW), and car...

Embodiment 3

[0038] Using microwave sintering to solidify heavy metal chromium to prepare ceramsite, the method is as follows:

[0039] 1) Chromium-contaminated soil sample: take the polluted soil near a chemical plant, the chromium content in this soil is 1453.44mg / kg;

[0040] 2) Treatment of chromium-contaminated soil: Weigh 100 g of chromium-contaminated soil sample and dry it in a drying oven for 3 hours, then cool the contaminated soil to room temperature, and put the powder in a ceramic ball mill for 30 minutes until the residue on a 100-mesh sieve is ≤15%;

[0041] 3) Mixed aging: add water to the treated soil in step 2) with graphite powder, iron oxide, aluminum powder and potassium feldspar according to the mass ratio of 84:3:3:3:7 (the mass of water is 8% of the total solid mass) Mix evenly, and make ceramsite blank after aging for 24 hours;

[0042]4) Sintering: Put the ceramsite blank obtained in step 3) into a microwave sintering furnace (output frequency is 2450±50MHz, outp...

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Abstract

The invention relates to a method for preparing ceramsite through microwave sintering and curing of heavy metal chromium. The method comprises specific steps as follows: graphite powder, ferric oxide, aluminum powder and potash feldspar are added to chromium-polluted soil, spheres are prepared and then heated with a microwave sintering method, and the ceramsite is prepared. The ceramsite is prepared from chromium-polluted soil as a main raw material, land pollution can be effectively treated, and effective utilization of waste resources is realized. Besides, the graphite powder is added to the raw materials, can serve as a pore-forming agent and also can serve as a reducer, toxic hexavalent chromium can be converted into trivalent chromium, and non-toxic treatment of chromium is realized. With the adoption of the microwave sintering technology, heating is more uniform, the sintering atmosphere is controllable, the sintering speed is high, the sintering quality is good, and hexavalent chromium can be converted into trivalent chromium through a sufficient reaction.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment and resource utilization, and relates to a method for preparing ceramsite by using microwave sintering and solidifying heavy metal chromium. Background technique [0002] Soil heavy metal pollution refers to human activities, the content of trace metal elements in the soil exceeds the background value, and the excessive content caused by excessive deposition is collectively referred to as soil heavy metal pollution. Soil is the most important natural resource of a country, and it is the material basis of agricultural development. But in recent years, with the process of industrialization, more and more land has been used to build factories, which in turn causes heavy metal pollution in the soil. At present, the problem of soil pollution in my country is very serious. Heavy metals have become the most common source of soil pollution. Once heavy metals enter the soil, it will be diffi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/06C04B33/13C04B33/32
CPCC04B38/009C04B33/13C04B33/32C04B2235/3201C04B2235/3272C04B2235/3472C04B2235/402C04B2235/425C04B2235/658C04B2235/667C04B2235/77C04B2235/96C04B38/068C04B38/0067
Inventor 蹇守卫余后梁吴世明孙孟琪马保国郅真真
Owner WUHAN UNIV OF TECH
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