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Method of detoxifying asbestos-containing solid waste

A technology for solid waste and waste, applied in the field of harmless treatment, which can solve the problems of high cost, fuel cost, and deterioration of treatment equipment.

Inactive Publication Date: 2013-09-04
TOKUYAMA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[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-temperature treatment is established, there is a problem that the treatment equipment deteriorates significantly in a short period of time
Moreover, in order to maintain the above-mentioned high temperature, a huge amount of energy is required, so the cost of fuel cannot be ignored, and the amount of carbon dioxide produced directly or indirectly along with the heat treatment is also huge.

Method used

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  • Method of detoxifying asbestos-containing solid waste

Examples

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Embodiment

[0102] Hereinafter, several Examples, Comparative Examples, and Reference Examples of the present invention including Example 15 are given, and it goes without saying that the present invention is not limited by these Examples and the like, but is defined by the claims of the patent application.

[0103] In addition, in the following Examples etc., the JEOL DATUM Co., Ltd. low-vacuum scanning electron microscope (model number: JSM-5600LV) was used as a scanning electron microscope. In addition, in each Example, the sodium silicate shown in Table 1 below was used as a solid alkali metal silicate.

[0104] [Table 1]

[0105] Table 1

[0106]

[0107] Reference example A

[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 furn...

Embodiment 15

[0150] The same operation as Reference Example A was performed except that 0.5 g of powdered sodium silicate JIS-1 (a powder obtained by drying water glass and having a water content of 20% by weight) was used as sodium silicate.

[0151] Using a scanning electron microscope to observe the contents of the crucible after heat treatment, as a result, the asbestos lost its needle-like fiber structure, and the asbestos fibers melted during the heat treatment, resulting in a structure of fusion between fibers ( Figure 5 -A(b)).

Embodiment 16

[0153] The same operation as Reference Example A was performed except having used 0.5 g of sodium metasilicate 9 hydrates (water content 57 weight%) as sodium silicate.

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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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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00A62D3/30C09K3/00A62D101/41
CPCA62D2101/41A62D3/40A62D3/36B09B3/0066
Inventor 手岛隆裕
Owner TOKUYAMA CORP
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