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Method and apparatus for continuous vitrification of fibrous materials

A fibrous material, continuous glass technology, applied in the field of asbestos and/or asbestos-containing materials, can solve the problems of limited use, expensive, and alternative methods are not completely satisfactory, and achieve the effect of reasonable cost

Active Publication Date: 2019-07-30
PYRO GREEN INNOVATIONS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] However, this method, which is the subject of current industrial development, is very expensive due to the very high energy consumption and the use of high-tech plasma torches requiring expensive maintenance
[0014] Therefore, currently the use of this method is still limited due to this high cost
[0015] Other processes have been proposed requiring high frequency generators or the addition of fluxes such as borax or acid treatment of asbestos but none of these alternatives are entirely satisfactory from an industrial point of view

Method used

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  • Method and apparatus for continuous vitrification of fibrous materials
  • Method and apparatus for continuous vitrification of fibrous materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0120] Example 1 - Destruction of Asbestos Cement

[0121] Asbestos cement is one of the most difficult materials to destroy due to its high content of calcium and magnesium oxides.

[0122] Asbestos is dangerous due to its special crystallization into fibers formed at great depths under great pressure and relatively mild temperature.

[0123] The method according to the invention makes it possible, in particular by adding silicon dioxide and iron oxide or iron, to dilute these alkaline earth metal oxides and melt them at mild temperatures, thereby inerting asbestos.

Embodiment 1A

[0125] a) Prepare molten glass bath

[0126] In this example, the above-mentioned furnace having a diameter of 3 meters and a height of 8 meters was used.

[0127] The vacuum furnace was preheated for about 2 hours to a temperature of about 1400° C. by means of auxiliary burners dropped into the furnace at the end of the cable.

[0128] When the temperature inside the furnace reached about 1400°C, the glass from the vitrified material granulated during the previous casting was slowly introduced.

[0129] In this step, by transporting from O 2 The 3 spray bars 5 of the flames produced by the combustion of a mixture of air and natural gas with a stoichiometric ratio of 1.1:1 maintain the temperature at about 1400°C.

[0130] When the level of molten glass in the furnace reached a height of 50 cm, 3 spray bars were immersed in a bath of molten glass to maintain a temperature of 1400°C. A flame submerged in a glass bath gives the method excellent efficiency.

[0131] b) Introd...

Embodiment 1B

[0149] Example 1A was repeated using enriched air containing 35% oxygen as the oxidant.

[0150] In this case the gas consumption is 711Nm 3 / h, the recovered energy is 2531Mcal / h, that is, 2.95MW th .

[0151] It should be understood that the oxygen content of the air supplied to the boom can be adjusted in order to optimize the power of the turbine.

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Abstract

The present invention relates to a method and an apparatus for continuous vitrification of fibrous materials, in particular asbestos and / or asbestos-containing materials. According to the invention, the method comprises the steps of: - preparing a molten glass bath (20) at a temperature between 1300°C and 1600°C; - introducing the fibrous material and optional melting additives into the molten glass bath such that the The bath has the following composition after addition of the fiber material and melt additives: -SiO 2 : 30% to 55%; -FeO: 25% to 45%; -Alkali and alkaline earth metal oxides: 15% to 25%; -Using at least one spray bar (5) to inject oxidant and fuel into the molten a bath in which one end of the spray rod is immersed; the oxidizing agent is introduced in a molar amount greater than or equal to the molar amount of fuel required to maintain the bath temperature at 1300°C to 1600°C; and - at least The temperature of a portion is lowered to make it solid. Application: Treatment of fiber waste, especially asbestos waste.

Description

technical field [0001] The present invention generally relates to a method and apparatus for continuous vitrification of fibrous materials, in particular asbestos and / or asbestos-containing materials. [0002] In the context of the present description, "fibrous material" is understood to mean any material formed partly or completely from fibers, ie particles having a length to diameter ratio greater than 3 and having approximately parallel sides. This material may consist of a single type of fiber or of a mixture of fibers which may or may not belong to the same class. These fibers may be mineral or organic fibers of natural or man-made origin. Background technique [0003] Fibrous materials are used in particular in the construction sector and in the fields of thermal, electrical and / or sound insulation and are potentially dangerous to human health. Specifically, fibers with a diameter of less than 3 μm can infiltrate into the alveoli, thereby becoming the cause of severe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00C03B5/00C03B5/235
CPCB09B3/0066C03B5/005C03B5/2356C03B2211/23B09B3/29B09B3/20F23D11/02F23D14/22F23D14/32F23G5/085F23G2202/20Y02P40/50
Inventor 安妮·贝尼舒安妮·拉古特格扎维埃·莫拉斯雅克斯·普瑞特
Owner PYRO GREEN INNOVATIONS