Method of detoxifying asbestos-containing solid waste

A solid waste and waste technology, applied in the field of harmless treatment, can solve problems such as difficulty in securing a new final disposal site, deterioration of processing equipment, and huge size

Inactive Publication Date: 2011-04-13
TOKUYAMA SILTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Asbestos-containing waste has been managed for almost all final disposal, but since it is difficult to secure a new final disposal site, it is now moving towards melting treatment
[0005] However, the melting process treats asbestos-containing waste at a high temperature of 1,500° C. Equipment setup requires high costs
Also, even if the above-mentioned equipment for high-temperatu

Method used

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  • Method of detoxifying asbestos-containing solid waste
  • Method of detoxifying asbestos-containing solid waste
  • Method of detoxifying asbestos-containing solid waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0108] Mix 0.5g asbestos thread and 0.5g sodium orthosilicate n water salt (SiO 2 / M 2 The molar ratio of O=0.5) was loaded into a crucible with a capacity of 50 ml, and stirred for about 10 seconds using a spatula. Then, the crucible was capped and placed in an electric heating furnace (electric furnace KBF-894N manufactured by Koyo Lindbergh Co., Ltd.), and heated at 900° C. for 1 hour in the electric furnace. Then, it was allowed to cool to room temperature, and the contents were taken out for observation with a scanning electron microscope.

[0109] As a result, asbestos loses its needle-like fibrous structure ( figure 1 -(a)).

Embodiment 2

[0111] Use 0.5g of anhydrous sodium metasilicate (SiO 2 / M 2 The same operation as in Example 1 was performed except that the molar ratio of O = 1) was used as sodium silicate.

[0112] Using a scanning electron microscope to observe the contents of the crucible after heat treatment, asbestos lost its needle-like fiber structure ( figure 1 -(b)).

Embodiment 3

[0114] Use 0.5g Ecolayer powder (SiO 2 / M 2 The same operation as in Example 1 was performed except that the molar ratio of O = 2) was used as sodium silicate.

[0115] Using a scanning electron microscope to observe the contents of the crucible after heat treatment, asbestos lost its needle-like fiber structure ( figure 1 -(c)).

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Abstract

A method of detoxifying an asbestos-containing waste is provided which includes a heat treatment step reduced in energy cost and is highly safe. In treating an asbestos-containing waste, an alkali silicate as a treating agent therefor is mixed in a solid state with the asbestos-containing waste and the mixture is heated.

Description

technical field [0001] The invention relates to a method for making solid waste containing asbestos harmless. Background technique [0002] Asbestos (asbestos) is a naturally occurring fibrous crystalline mineral that has been used for many years in building materials, electrical products, automobiles or households due to its excellent acid resistance, alkali resistance, heat resistance and mechanical strength Supplies and other wide-ranging fields. [0003] However, it is known that asbestos is harmful to the human body and can cause lung cancer and malignant mesothelioma. In recent years, its use has been completely banned. Along with this, asbestos-containing waste (hereinafter also referred to as "asbestos-containing waste") is generated in large quantities, and how to dispose of the above-mentioned waste has become a big problem. [0004] Disposal of the above-mentioned asbestos-containing waste is strictly regulated in accordance with the "Law Concerning Disposal and...

Claims

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Application Information

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IPC IPC(8): B09B3/00A62D3/30C09K3/00A62D101/41
CPCA62D2101/41A62D3/40B09B3/0066A62D3/36
Inventor 手岛隆裕
Owner TOKUYAMA SILTECH
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