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Resource utilization method of hexavalent chromium contaminated soil

A technology for polluted soil and hexavalent chromium, which is applied in the field of resource utilization of hexavalent chromium polluted soil, can solve problems such as soil yellowing, and achieve the effects of reducing treatment costs, high cylinder compressive strength and bulk density, and good integrity

Active Publication Date: 2020-09-18
山东洛尔环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005]Aiming at the existing methods for treating hexavalent chromium-contaminated soil, after environmental changes and the passage of time, trivalent chromium in the soil will be oxidized to hexavalent chromium and hexavalent chromium The technical problems of re-dissolution and "returning yellow" in the soil, the present invention provides a resource utilization method for hexavalent chromium-contaminated soil, except for hexavalent chromium-contaminated soil, the rest of the raw materials are also industrial waste, and the present invention utilizes The method solves the problem of where to restore the soil, and does not need to purchase additional resources such as raw coal, which achieves the purpose of "treating waste with waste" and reduces disposal costs

Method used

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  • Resource utilization method of hexavalent chromium contaminated soil
  • Resource utilization method of hexavalent chromium contaminated soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for resource utilization of hexavalent chromium-contaminated soil, the method comprising:

[0029] (1) First use a jaw crusher to crush the hexavalent chromium-contaminated soil, then use a ball mill to grind to a size below 100 mesh, and then use a vibrating screener to sieve after grinding, and then grind the particles larger than 100 mesh;

[0030] Among them, refer to USEPA3060A-1996 alkali digestion method of hexavalent chromium, USEPA7196A-1992 Cr in soil 6+ Analytical spectrophotometry, HJ766-2015 Inductively Coupled Plasma Mass Spectrometry for the Determination of Metal Elements in Solid Wastes, Diphenylcarbazide Spectrophotometry for the Determination of Hexavalent Chromium in GB / T15555.4-1995 Solid Wastes, HJ687 - Alkaline digestion flame atomic absorption spectrophotometry specified in 2014 for the determination of hexavalent chromium in solid waste, sulfuric acid and nitric acid method specified in HJ / T299-2007 Solid waste leaching toxicity leachin...

Embodiment 2

[0043] A method for resource utilization of hexavalent chromium-contaminated soil, the method comprising:

[0044] (1) First use a jaw crusher to crush the hexavalent chromium-contaminated soil, then use a ball mill to grind to a size below 100 mesh, and then use a vibrating screener to sieve after grinding, and then grind the particles larger than 100 mesh;

[0045] Wherein, the total chromium, hexavalent chromium and the leached total chromium and hexavalent chromium of polluted soil are detected, and the detection method is the same as in Example 1, and the detection results are as follows:

[0046]

[0047] (2) First use a jaw crusher to crush the blast furnace slag, then use a ball mill to grind to below 100 mesh, and then use a vibrating screener to sieve after grinding, and grind again for particles larger than 100 mesh;

[0048] Among them, the blast furnace slag is a by-product in the matte smelting process, and the blast furnace slag includes FeO, CaO, MgO, C, SiO...

Embodiment 3

[0059] A method for resource utilization of hexavalent chromium-contaminated soil, the method comprising:

[0060] (1) First use a jaw crusher to crush the hexavalent chromium-contaminated soil, then use a ball mill to grind to a size below 100 mesh, and then use a vibrating screener to sieve after grinding, and then grind the particles larger than 100 mesh;

[0061] Wherein, the total chromium, hexavalent chromium and the leached total chromium and hexavalent chromium of polluted soil are detected, and the detection method is the same as in Example 1, and the detection results are as follows:

[0062]

[0063] (2) First use a jaw crusher to crush the blast furnace slag, then use a ball mill to grind to below 100 mesh, and then use a vibrating screener to sieve after grinding, and grind again for particles larger than 100 mesh;

[0064] Among them, the blast furnace slag is a by-product in the matte smelting process, and the blast furnace slag includes FeO, CaO, MgO, C, SiO...

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Abstract

The invention relates to the technical field of soil treatment, in particular to a resource utilization method of hexavalent chromium contaminated soil. The method comprises the following steps: (1) physically crushing and screening hexavalent chromium contaminated soil, (2) physically crushing and screening blast furnace slag, (3) uniformly stirring and mixing water, the screened hexavalent chromium contaminated soil and blast furnace slag, (4) granulating the mixture to form a ceramsite raw material, (5) drying and roasting the ceramsite raw material, and (6) cooling the roasted ceramsite toobtain a ceramsite product taking hexavalent chromium contaminated soil and blast furnace slag as raw materials. According to the method, the remediation problem of the remediated soil is solved in aresource utilization mode, resources such as raw coal do not need to be purchased additionally, the purpose of treating waste with waste is achieved, and the disposal cost is reduced.

Description

technical field [0001] The invention relates to the technical field of soil treatment, in particular to a resource utilization method for hexavalent chromium-contaminated soil. Background technique [0002] In recent years, the chromium salt industry has produced a large amount of chromium slag. Although most of the chromium slag has been safely disposed of, the long-term stacking of chromium slag still causes serious soil pollution problems. At present, soil remediation projects mainly adopt stabilization methods to deal with hexavalent chromium-contaminated soil, such as landfill, cement kiln co-processing and use as roadbed, etc. Among them, the landfill method not only increases the treatment cost, but also takes up a lot of soil resources ; Although cement kiln co-processing and disposal can quickly solve the problem of site development, it is obviously restricted by the presence or absence of cement kiln factories around, and the processing cost increases at the same t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/00C04B33/32C04B33/138C04B33/132B07B1/28B02C23/08B02C21/00B02C17/10B02C1/02
CPCC04B38/009C04B33/138C04B33/1327C04B33/32B02C1/02B02C23/08B07B1/28B02C21/00B02C17/10C04B2235/96C04B2235/6567C04B2235/656Y02P40/60
Inventor 任志豪
Owner 山东洛尔环保科技有限公司
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