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Harmless method of solid waste containing heavy metals

A technology for solid waste and heavy metals, which is applied in the field of insolubilization and harmlessness of harmful heavy metals, and can solve the problems of difficulty in simultaneously satisfying the insolubilization performance of heavy metals with solidification properties.

Active Publication Date: 2018-01-12
KURITA WATER INDUSTRIES LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, even if the methods of Patent Documents 1 and 2 are combined, it is difficult to simultaneously satisfy the above-mentioned curing performance and insolubilization performance of heavy metals.

Method used

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  • Harmless method of solid waste containing heavy metals
  • Harmless method of solid waste containing heavy metals
  • Harmless method of solid waste containing heavy metals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0051] Next, the present invention will be described in detail through examples, but the present invention is not limited by these examples.

[0052] [Evaluation method]

[0053] In addition, the following evaluation methods were implemented in the evaluation of the Example and the comparative example.

[0054] (1)pH

[0055] Prepare the sample solution (pH of solvent : 6.3), measure the pH of the sample solution.

[0056] (2) Dissolution amount of each component

[0057] After curing for one day, the kneaded product was pulverized to a size of 2 mm or less, and a dissolution test was carried out according to Announcement No. 46 of the Environmental Agency in 2013 to measure the dissolution amount of each component. In addition, the elution standard value of each component is as follows.

[0058] (dissolution standard value)

[0059] Lead (Pb): less than 0.01mg / L, hexavalent chromium (Cr(VI)): less than 0.05mg / L,

[0060] Fluorine (F): 0.8mg / L or less, Boron (B): 1.0mg / ...

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PUM

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Abstract

The present invention provides a method for detoxifying solid waste containing heavy metals, which can fully solidify solid waste containing heavy metals and effectively insolubilize heavy metals contained in solid waste, thereby making solid waste Harmless method of harmless solid waste. The method for detoxifying solid waste of the present invention includes the steps of adding blast furnace slag and iron salt to solid waste containing heavy metals and kneading to prepare a kneaded product, and solidifying the kneaded product, No cement is added to solid waste.

Description

technical field [0001] The present invention relates to a detoxification method of solid waste containing heavy metals, and specifically relates to a method of effectively insolubilizing and detoxifying harmful heavy metals contained in solid waste such as incineration ash. Background technique [0002] In recent years, research has been conducted on the recycling of incineration ash discharged from coal-fired boilers, biomass boilers, etc. as civil engineering materials. However, incineration ash contains heavy metals derived from coal and biomass fuels. Even if the content of heavy metals in incineration ash meets the standards of the Soil Pollution Countermeasures Law (for example, the Ministry of the Environment Notice No. 19)), it may exceed the dissolution standard ( For example, Ministry of the Environment Notice No. 18) and heavy metals are leached from incineration ash. In particular, harmful substances such as lead, hexavalent chromium, arsenic, selenium, fluorine...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00
Inventor 村田裕之
Owner KURITA WATER INDUSTRIES LTD