Manufactory industry materials and products asbestine and asbestos-free friction, sealing, heat-insu
All are composed of long and thin fibrous crystals , each fiber being composed of many microscopic 'fibrils' that can be released into the atmosphere by abrasion and other processes. Asbestos is an excellent electrical insulator and is highly resistant to heat, so for many years it was used as a building material. Inhalation of asbestos fibres can lead to various serious lung conditions, including asbestosis and cancer. Archaeological studies have found evidence of asbestos being used as far back as the Stone Age to strengthen ceramic pots,  but large-scale mining began at the end of the 19th century when manufacturers and builders began using asbestos for its desirable physical properties.VIDEO ON THE TOPIC: brake pads manufacturer
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Asbestos - Wikipedia, The Free Encyclopedia
The present invention relates to a method for modifying asbestos, and more particularly to a method for modifying asbestos using microwave technology. Asbestos has excellent properties such as heat resistance, fire resistance, soundproofing, chemical resistance, wear resistance, insulation, and corrosion resistance.
Among the asbestos, crocidolite, amosite, and chrysotile are frequently used, and the amount of chrysotile used is the largest due to the delay of legal regulations in Japan. As building materials, corrugated asbestos slate, residential asbestos slate, asbestos cement board flexible board, flat plate, soft board, etc.
Examples of the seal heat insulating material include asbestos textiles yarn, cloth , gland packing, asbestos joint sheet, spiral gasket, asbestos board millboard , asbestos paper and insulating products. Examples of the friction material include a brake lining for automobiles, a clutch fading for automobiles, a disk pad for automobiles, an industrial mold product, and a specially processed opener.
Examples of the heat insulating material include asbestos heat insulating material, diatomaceous earth heat insulating material, pearlite heat insulating material, calcium silicate heat insulating material, and asbestos cement pipe for water supply. Therefore, it is expected that about 40 million tons of building waste as non-sprayable and non-sprayable asbestos waste accompanying the dismantling of buildings, etc.
On the other hand, asbestos is considered to be the cause of mesothelioma, lung cancer, etc. There is an urgent need to establish a detoxification method for asbestos waste, including measures to prevent asbestos waste from being discharged, transported, and treated by suction, and to prevent scattering to the surrounding environment.
Building materials that occupy most of asbestos waste contain, for example, asbestos and cement. Therefore, an effective detoxification method for building materials containing asbestos and cement is required. Conventionally, a method has been proposed in which asbestos is detoxified by heating it with a combustion-type heating furnace or an electric furnace.
For example, Patent Document 1 discloses a method of detoxifying asbestos by using a combustion-type heating furnace. The shaped mixture is then fed to a high temperature hearth made of carbon-based combustible material and heated and melted. For example, Patent Document 2 discloses a method for detoxifying asbestos by using an electric furnace.
In this method, carbon powder serving as a high-temperature heat source and raw material serving as a molten slag source are charged in advance into the melting furnace. And by supplying with electricity to the graphite electrode of a melting furnace, molten metal slag is produced generated, waste asbestos material is thrown into the said molten metal slag, and it heats and fuse melts.
A combustion-type heating furnace that generates such a high temperature requires a supply device for carbon-based combustible materials such as coke. This increases the size of the asbestos heating device, which increases the cost of manufacturing and maintaining the device. In addition, electric furnaces and combustion-type heating furnaces require a long time after reaching the high temperature at which asbestos can be modified.
Furthermore, since asbestos has high heat resistance and low thermal conductivity, it takes a long processing time for the asbestos lump to be heated to the inside of the lump after being put into an electric furnace, slag bath blast furnace, etc.
It becomes. Therefore, heating of asbestos by an electric furnace and a melting furnace is inefficient. This is because the heating of a substance by an electric furnace and a melting furnace is an indirect external heating in which the surface of the substance is heated from the outside and the whole substance is gradually heated by heat conduction to the inside of the substance.
In particular, in order to heat the asbestos lump mixed and solidified with cement to the inside thereof, a longer processing time is required. Japanese Patent Laid-Open No. An object of the present invention is to provide a method for modifying asbestos that can modify asbestos in a short time. In one aspect of the present invention, a method for modifying asbestos is provided. The method includes the asbestos, and heated by microwave irradiation to asbestos-containing material produced from the cement containing calcium oxide as a microwave heating additive for exothermic aid to self-heating by irradiation of asbestos A step of modifying asbestos in the inclusion.
According to this method, in the asbestos-containing material, the heat generating aid is selectively heated by microwave irradiation. Therefore, a large temperature gradient is generated between the exothermic auxiliary agent and asbestos, and this temperature gradient causes a non-equilibrium chemical reaction at the boundary between the exothermic auxiliary agent and asbestos.
As a result, a crystal structure transition and a chemical reaction that cannot occur in an equilibrium state proceed. And with the microwave irradiation, the entire asbestos-containing material is heated to reach equilibrium, and the chemical reaction is completed. Thereby, the acicular crystal which asbestos has is thermally denatured and decomposed, and asbestos is modified.
Furthermore, the microwave can directly heat the inside of the asbestos-containing material having a lump shape, for example. Therefore, heating by microwave irradiation is suitable for heating a substance having lower thermal conductivity than heating by an electric furnace or a melting furnace, and the entire asbestos-containing material can be heated simultaneously.
As a result, asbestos in the asbestos-containing material can be easily heated throughout the asbestos-containing material and can be modified in a short time. In addition, asbestos modification treatment may include pulverizing asbestos-containing materials or bagging asbestos-containing materials.
At this time, water or chemicals may be added to the asbestos-containing material in order to prevent the worker from sucking the asbestos or scattering the asbestos into the environment. Also in this case, heating of the asbestos-containing material by microwave irradiation is not hindered by water and chemicals added to the asbestos-containing material. Therefore, this method is suitable for the detoxification treatment of asbestos-containing materials.
Oxidation calcium is a high temperature is easily heated by microwave irradiation. Oxidation of calcium is included in the cement. Therefore, for example, building materials such as slate molding plates containing asbestos and cement, machine parts such as devices used in ships, or asbestos in wastes thereof can be modified in a short time.
In another aspect of the invention, a method for modifying asbestos is provided. The method asbestos and, a step of pulverizing the asbestos-containing material produced from the cement containing calcium oxide in the heating aid to self-heating by microwave irradiation, microwaves milled asbestos compounds Irradiating and heating to denature asbestos in the asbestos-containing material.
According to this method, for example, asbestos can be modified in a short time by pulverizing the asbestos-containing material and irradiating the pulverized asbestos-containing material with microwaves.
Below, the modification denaturation method of asbestos in the asbestos containing material which concerns on this invention is demonstrated in detail. The method for modifying asbestos according to this embodiment includes asbestos and a heating aid that self-heats by irradiation with microwaves, pulverizing the asbestos-containing material, and irradiating the pulverized asbestos-containing material with microwaves.
Heating to denature the asbestos in the asbestos-containing material. The microwave of the present application is an energy source for heating a substance, and is an electromagnetic wave including a very long short wave UHF , a centimeter wave SHF , a millimeter wave EHF , and a submillimeter wave having a frequency from MHz to 3 THz.
As the microwave, an electromagnetic wave having a frequency from MHz to 30 GHz is preferable. Furthermore, since the application results to the microwave furnace are abundant and the introduction cost is expected to be reduced, an electromagnetic wave having a frequency of 2. A heating aid that self-heats when irradiated with microwaves is a substance that absorbs a large amount of microwaves. The heat generation aid is at least one selected from the group consisting of silicon carbide, carbon, calcium oxide, iron, and iron oxide eg, magnetite Fe 3 O 4 because it absorbs microwaves and is inexpensive.
Is preferable, and calcium oxide is more preferable. The exothermic auxiliary is heated by microwave irradiation to generate heat. On the other hand, asbestos is a substance with low microwave absorption, and heating of asbestos by irradiating only asbestos with microwaves cannot be expected.
Therefore, in order to heat asbestos throughout the asbestos-containing material, it is preferable that the exothermic auxiliary agent is uniformly dispersed in the asbestos-containing material. That is, the exothermic auxiliary agent preferably has a powder form. The content of the exothermic aid varies depending on, for example, the expected heat treatment time of the asbestos-containing material, the intensity of the microwave used, the composition of the asbestos-containing material, or the type of the exothermic assistant.
Examples of the asbestos-containing material include asbestos-containing products such as the building materials, seals and heat insulating materials, friction materials, and heat insulating materials, and wastes thereof. Examples of the building material include a mixture of asbestos and cement containing calcium oxide as a heat generation aid.
Therefore, the asbestos modification method of the present embodiment can modify asbestos without pre-treating a slate molded plate, a sprayed asbestos, or the like as an asbestos-containing material.
However, depending on the content of calcium oxide in the building material or the dispersion state of calcium oxide, for example, when the slate molded plate is pulverized, an exothermic auxiliary agent may be added to the pulverized slate molded plate. The asbestos-containing material may contain water.
In this case, water in the asbestos-containing material is heated with high efficiency by microwave irradiation, as in the case of heating food in a microwave oven. Therefore, in order to prevent the worker from sucking asbestos or scattering the asbestos into the environment, for example, when the asbestos-containing material is crushed or crushed, an appropriate amount of water is added to the asbestos-containing material.
Also good. The shape of the asbestos-containing material is not particularly limited. The asbestos-containing material may have an indeterminate shape like the slate molded plate, may have a pellet shape, or have an indeterminate lump shape sprayed on the article to be sprayed.
In the step of pulverizing the asbestos-containing material, dry pulverization or wet pulverization in which an appropriate amount of water is added to the asbestos-containing material to prevent the asbestos from scattering is performed. At this time, the asbestos-containing material is roughly crushed to 10 mm square, for example. Examples of the apparatus used for pulverizing the asbestos-containing material include known pulverization apparatuses such as a jaw crusher, a cutter mill, a hammer mill, a ball mill, and a medium stirring mill.
These devices are preferably hermetically sealed to prevent asbestos from splashing outside the device. In the step of irradiating the asbestos-containing material with microwaves, the pulverized asbestos-containing material is introduced into an asbestos heating device microwave heating device , and then the pulverized asbestos-containing material is irradiated with microwaves. The asbestos heating device includes a chamber into which an asbestos-containing material is introduced, and a microwave generator that irradiates the chamber with microwaves.
Asbestos has high heat resistance, fire resistance, and heat insulation, so far, it has been considered difficult to modify asbestos. Furthermore, since asbestos is a substance that absorbs less microwaves, it has been considered impossible to modify asbestos by irradiating asbestos with microwaves. On the other hand, for example, various ceramics, metals, and minerals are substances that absorb a large amount of microwaves, and are known to generate heat when irradiated with microwaves. However, the following results are obtained when a mixture of particles made of a substance having a low microwave absorption a substance transparent to microwaves and a particle made of a substance having a high absorption of microwaves is irradiated with the microwave.
That is, when the mixture is irradiated with microwaves, particles made of a substance having a large absorption of microwaves absorb the microwaves and are selectively heated to increase the temperature of the particles. On the other hand, the temperature of particles made of a substance with low microwave absorption does not rise so much. As a result, a large temperature gradient is generated between these particles on a microscopic scale.
This temperature gradient reaches as high as several hundred degrees per 0. Therefore, when the asbestos-containing material is irradiated with microwaves, the heat generation aid in the asbestos-containing material is selectively heated. As described above, a non-equilibrium chemical reaction occurs at the boundary between the exothermic auxiliary agent and asbestos, and a crystal structure transition and a chemical reaction that cannot be obtained in an equilibrium state proceed.
Next, the entire asbestos-containing material is heated with microwave irradiation to reach equilibrium, and the chemical reaction is completed. Thereby, in this embodiment, the acicular crystal crystallization which asbestos has thermally denatures and decomposes disassembles and asbestos is modified denatured.
When the asbestos-containing material contains cement granules, the microwaves are absorbed by the moisture in the cement granules and thermal distortion occurs. And the crack crushing of a cement granular material advances and the heating inside a cement granular material is accelerated stimulated. The temperature of the asbestos-containing material in the asbestos heating device is measured, for example, with a radiation thermometer. The intensity of the microwave irradiated to the asbestos heating apparatus is adjusted as appropriate to control the temperature of the asbestos-containing material.
Then, after the temperature of the asbestos-containing material reaches an appropriate asbestos decomposition temperature, the temperature is maintained for a certain time. The step of pulverizing the asbestos-containing material may be omitted. Also in this case, the asbestos in the asbestos-containing material can be modified by irradiating the asbestos-containing material with microwaves and heating.
Example 1 and Comparative Example 1 In Example 1, a sample in which 10 sheets of asbestos-containing material having a plate shape were stacked was prepared. Next, this sample was introduced into an electric furnace having a microwave generator.
JP5194297B2 - Asbestos modification method - Google Patents
Descubra todo lo que Scribd tiene para ofrecer, incluyendo libros y audiolibros de importantes editoriales. Asbestos - Wikipedia, the free encyclop…. From Wikipedia, the free encyclopedia. The inhalation of asbestos fibers can cause serious illnesses, including malignant lung cancer, mesothelioma a formerly rare cancer strongly associated with exposure to amphibole asbestos , and asbestosis a type of pneumoconiosis.
Fibrous asbestos on muscovite. Blue asbestos crocidolite from Wittenoom, Western Australia. The ruler is 1 cm. They all have in common their asbestiform habit, long, thin fibrous crystals.
Dictionary of Ceramic Science and Engineering
Sadly, the beautiful state of California is now a lost cause politically. But still keep fighting to restore her greatness. What exactly is the American Redoubt? For those who are more attached to the East Coast and can't easily migrate to the American Redoubt in the Intermountain-West, we recommend the blog of the inspirational M. Creekmore who posted Joel M. The concept that anyone caught East of the Mississippi River is doomed is only partially valid and highly exaggerated. You can achieve a significantly higher level of safety going beyond the Appalachians to the high plateau regions of Tennessee and Kentucky.
InspectAPedia tolerates no conflicts of interest. We have no relationship with advertisers, products, or services discussed at this website. This document assists building buyers, owners or inspectors who need to identify asbestos materials or probable-asbestos in buildings by simple visual inspection. We provide photographs of asbestos containing materials and descriptive text of asbestos insulation and other asbestos-containing products to permit identification of definite, probable, or possible asbestos materials in buildings. Asbestos is safe and legal to remain in homes or public buildings as long as the asbestos materials are in good condition and the asbestos can not be released into the air.
NCBI Bookshelf. Carbon Black, Titanium Dioxide, and Talc. The mineralogy of airborne particles in talc mines is restricted by that of the deposit and associated rocks.
The present invention relates to a method for modifying asbestos, and more particularly to a method for modifying asbestos using microwave technology. Asbestos has excellent properties such as heat resistance, fire resistance, soundproofing, chemical resistance, wear resistance, insulation, and corrosion resistance. Among the asbestos, crocidolite, amosite, and chrysotile are frequently used, and the amount of chrysotile used is the largest due to the delay of legal regulations in Japan.
This article will be permanently flagged as inappropriate and made unaccessible to everyone. Are you certain this article is inappropriate? Email Address:. Asbestos pronounced or is a set of six naturally occurring silicate minerals  which all have in common their eponymous asbestiform habit: long roughly aspect ratio , thin fibrous crystals , with each visible fiber composed of millions of microscopic "fibrils" that can be released by abrasion and other processes. Asbestos mining began more than 4, years ago, but did not start large-scale until the end of the 19th century when manufacturers and builders used asbestos because of its desirable physical properties:  sound absorption, average tensile strength , its resistance to fire , heat, electrical and chemical damage, and affordability.
Physico-chemical aspects of methods for obtaining mortars, concrete, artificial stones or ceramics , e. Treatment including defibrillating of materials such as fillers , agglomerated or waste materials, or refuse to enhance their filling properties in mortars, concrete or artificial stone. After- treatment of artificial stones, mortars, concrete and ceramics , e. Processing powders of inorganic compounds in preparation to the manufacturing of ceramic products. Mechanical features relating to the working of mortars, concrete, stone, clay-wares or ceramics , e. Compositions containing free metal bonded to carbides, diamond, oxides, borides, nitrides, silicides, e. Hydraulic hardening materials , e. For details, see below.
Asbestos mining existed more than 4, years ago, but large-scale mining began at the end of the 19th century, when manufacturers and builders began using asbestos for its desirable physical properties:  sound absorption , average tensile strength , resistance to fire , heat, electricity, and affordability. It was used in such applications as electrical insulation for hotplate wiring and in building insulation. When asbestos is used for its resistance to fire or heat, the fibers are often mixed with cement or woven into fabric or mats.
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С течением времени это выражение стало означать нечто честное, правдивое. Английское слово sincere, означающее все правдивое и искреннее, произошло от испанского sin сега - без воска.
Тишина. Наверное, Меган, подумал. У нее оставалось целых пять часов до рейса, и она сказала, что попытается отмыть руку. - Меган? - позвал он и постучал. Никто не ответил, и Беккер толкнул дверь.
Телефонный звонок окончательно прогнал сон. Сьюзан Флетчер вздохнула, села в кровати и потянулась к трубке. - Алло. - Сьюзан, это Дэвид. Я тебя разбудил. Она улыбнулась и поудобнее устроилась в постели. - Ты мне только что приснился.
Черный ход представлял собой несколько строк хитроумной программы, которые вставил в алгоритм коммандер Стратмор. Они были вмонтированы так хитро, что никто, кроме Грега Хейла, их не заметил, и практически означали, что любой код, созданный с помощью Попрыгунчика, может быть взломан секретным паролем, известным только АНБ. Стратмору едва не удалось сделать предлагаемый стандарт шифрования величайшим достижением АНБ: если бы он был принят, у агентства появился бы ключ для взлома любого шифра в Америке.