Treatment method of aluminum and iron composite polluted soil

A composite pollution and soil technology, applied in the field of soil remediation, can solve the problems of high treatment cost, high equipment requirements, and large workload, and achieve the effects of simple treatment method, short process flow and strong pertinence

Inactive Publication Date: 2019-02-05
CHANGSHA HUIJU ENVIRONMENTAL TECH CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0007] At present, soil pollution remediation technology itself has obvious limitations. Physical remediation technology has problems such as high energy consumption, high processing cost, high equipment requirements, and heavy workload; chemical remediation technology has high processing cost and the risk of secondary pollution; Bioremediation has slow remediation process and incomplete degradation of pollutants leading to secondary pollution, etc.

Method used

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  • Treatment method of aluminum and iron composite polluted soil

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Embodiment Construction

[0029] Excavate the soil of the aluminum and iron composite polluted plot, and process it into 2-5mm soil particles through a crusher; send the soil particles into a muffle furnace for high-temperature roasting at a temperature of 750°C, and the aluminum sulfate and sulfuric acid in the soil Iron and other sulfates are decomposed into oxides such as aluminum oxide and iron oxide, and ground to obtain soil powder; 0.1mol / L dilute hydrochloric acid is added to 1 kg of soil powder, so that the soil powder is immersed in the dilute hydrochloric acid solution; then 50 g of activated carbon powder is added to fully Mixing, the aluminum compound in the soil is converted into aluminum chloride, and the iron compound is converted into ferric chloride; filter to obtain dehydrated soil; put the obtained soil into a vacuum reactor, the system pressure is 10KPa, and heated to 185-200°C Keep the temperature for 30 minutes, heat and volatilize the aluminum chloride in the soil, and separate i...

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Abstract

The invention provides a treatment method of aluminum and iron composite polluted soil. The method comprises the steps of digging out aluminum and iron composite polluted land masses; processing the aluminum and iron composite polluted land masses into 2-5mm soil particles through a crusher; feeding the soil particles into a muffle furnace for roasting under high temperature; grinding to obtain soil powder; adding diluted hydrochloric acid to the soil powder; adding activated carbon powder; fully mixing; filtering to obtain dewatered soil; adding soil to a vacuum reactor; heating until the temperature reaches 185-200 DEG C; maintaining the temperature for 30min; increasing the temperature to be 500; maintaining the temperature for 30-60min; crushing and disaggregating the obtained soil; feeding the soil into a magnetic separator; and separating iron from the soil so as to obtain the remediated soil. With the adoption of the method, aluminum and iron can be effectively separated; metalresource can be recycled; and the heavy metal polluted soil can be stably remediated.

Description

Technical field: [0001] The invention relates to the technical field of soil remediation, in particular to a treatment method for aluminum and iron composite polluted soil. technical background: [0002] With the rapid development of urbanization in our country, a large number of polluted sites have been generated due to the closure and relocation of factories. Most of these sites have the characteristics of heavy metal complex pollution, which poses a serious threat to human health and the ecological environment, and effective restoration is urgently needed. [0003] With the rapid development of industry and agriculture, chemical pollutants are continuously released into the ecosystem, and more than one chemical pollutant is tending to exist in the ecosystem at the same time. As a result, industrial and agricultural production and human health are facing the serious challenge of "compound pollution". How to remediate these compound polluted soils has become the focus of a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/06B09C1/00F23G7/14
CPCB09C1/065B09C1/00F23G7/14F23G2209/24
Inventor 不公告发明人
Owner CHANGSHA HUIJU ENVIRONMENTAL TECH CO LTD
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