What is asbestos?

What is asbestos? What's the use?

1. What is asbestos? Asbestos is a general term for natural fibrous siliceous minerals. It is a silicate mineral fiber widely used in building materials and fireproof boards. It is also the only natural mineral fiber. It has good tensile strength and good thermal insulation. It has anti-corrosion properties and is not easy to burn, so it is widely used. There are many types of asbestos. The three most common ones are chrysotile asbestos (white asbestos), amosite asbestos (brown asbestos) and crocidolite (blue asbestos). Among them, the content of chrysotile asbestos is The most abundant and widely used. 2. The harm of asbestos to the human body: Asbestos itself is not toxic. Its greatest harm comes from its fibers. This is a very small fiber that is almost invisible to the naked eye. When these small fibers After being released, it can float in the air for a long time and be inhaled into the human body. The inhaled asbestos fibers can accumulate in the human body for many years, attach and deposit in the lungs, causing lung diseases. Exposure to asbestos fibers can cause the following diseases: Lung cancer Mesothelial cancer - cancer of the pleura or peritoneum Asbestosis - scarring of the lungs due to fibrosis of the tissue in the lungs (asbestosis) Symptoms of asbestos-related diseases often have a long incubation period, possibly about 10 years after exposure to asbestos It does not appear until 40 years (usually 15-20 years for lung cancer and 20-40 years for mesothelioma). Asbestos has been confirmed as a carcinogen by the International Center for Research on Cancer. 3. Sources of indoor asbestos: (1) Ceilings in some old residences , most of the thermal insulation and sound insulation materials of pipelines are asbestos products. When these asbestos materials are dismantled, cut, and reshaped, a large number of small asbestos fibers will be scattered in the air. Some building materials and home decoration materials such as asbestos cement, vinyl Plastic-based floors can emit tiny asbestos fibers.

What material is asbestos? What harm does it do to the body?

Asbestos, also known as "asbestos", refers to silicate mineral products with high tensile strength, high flexibility, resistance to chemical and thermal erosion, electrical insulation and spinnability. It is the general name for natural fibrous silicate minerals.

Asbestos is divided into 2 categories and 6 minerals in total, including serpentine asbestos, amphibole asbestos, actinolite asbestos, anthophyllite asbestos, amosite asbestos, tremolite asbestos, etc. The harms of asbestos to the body include:

1. Because asbestos fibers can cause asbestosis, pleural mesothelioma and other diseases, many countries have chosen to completely ban the use of this dangerous substance, and some other countries are reviewing asbestos danger.

2. Asbestos itself is not toxic. Its greatest harm comes from its dust. When these fine dust are inhaled into the human body, they will adhere to and deposit in the lungs, causing lung diseases. Asbestos It has been confirmed as a carcinogen by the International Center for Research on Cancer.

3. On the other hand, extremely tiny asbestos dust flies into the air and is inhaled into the human lungs. After an incubation period of 20 to 40 years, it can easily induce lung cancer and other lung diseases. In Europe, it is predicted that the number of patients dying from lung cancer caused by asbestos pollution will reach 500,000 by 2020. In Japan, it is predicted that 100,000 people will die by 2040.

Extended information:

In addition, investigations by the British Broadcasting Corporation (BBC) and the International Consortium of Investigative Journalists found that the international asbestos industry has been exporting asbestos to developing countries, and those countries often There is a lack of occupational safety regulations.

Due to its low price, asbestos is very popular in developing countries, especially in the construction industry, which uses it to make fireproof, heat-insulating, and sound-insulating building materials such as fireproof roofs and water pipes.

As well as blue and brown asbestos, their use is now banned worldwide because of widespread evidence that they cause respiratory disease and death from cancer. People, including many scientists, reject the theory that asbestos is safe to use, citing the World Health Organization's view that white asbestos is also a known carcinogen and may cause cancers such as lung and mesothelioma.

The use of white asbestos has been banned in EU countries, but it continues to be used in countries such as India and Russia. A senior WHO scientist says he personally believes the mining, export and use of white asbestos should now be banned worldwide.

Sogou Encyclopedia - Asbestos

China News Network - Foreign Media: The use of asbestos will cause hundreds of thousands of deaths in developing countries

What is asbestos specifically?

The word asbestos comes from the Greek word meaning "inextinguishable".

It refers to a group of 6 naturally occurring, flexible, fibrous, hydrated silicate minerals that are relatively resistant to damage and heat. Chrysolite, or white asbestos, is classified as a serpentine mineral due to its layered silicate structure.

It accounts for 95% of the asbestos produced worldwide and is produced in the United States in California, Arizona and Vermont. Crocidolite, amosite, anthophyllite, tremolite and actinolite are all called amphibole due to their chain-like silicate structure.

Various types of asbestos vary in their toxicity, in part due to their morphology and physicochemical properties. The diameter and length of asbestos fibers are important in determining their likely pathogenicity.

Amphibole is more likely to cause cancer and pleural fibrosis, but pulmonary fibrosis seems to be also related to amphibole and chrysolite.

What is asbestos?

Asbestos is extremely chemically stable, resistant to acid and alkali, and resistant to high temperatures. It can be said that it is the same as ceramic fragments and can remain on the surface of the earth until the earth disappears.

Asbestos ore is melted and melted at high temperature to extract filament fibers, which can be woven into cloth. Firefighters' overalls are made of it, and cotton-like insulation materials are used in many fields, including space shuttles. It is used in the outside belly, asbestos tiles in building materials, interlayers in safes, brake pads in car brakes, etc. But workers in this industry are prone to occupational diseases, including lung tumors.

Scientists observed tumor slices under a microscope and found that there were extremely fine, needle-shaped asbestos fibers in the cells. From this, they concluded that asbestos fibers are toxic to humans (possibly including living things). Asbestos fibers are very easy to break, and the broken fragments are extremely hard. If they are inhaled into the human body, they will be inserted into the cells like extremely fine steel needles, and they will remain in the cells and cannot be excreted. Over time, the cells will mutate and develop into tumors.

Not only the lungs, but if it enters through the esophagus, you may also suffer from digestive system diseases. Any substance that is extremely fine and chemically stable is harmful to humans, such as talcum powder. Recently, medical workers performed biopsies on tumors in the female reproductive system, such as uterine tumors, and found that magnesium silicate is present in tumor cells. fiber.

It is speculated that the scourge was planted in infancy, because in summer, most adults will use talcum powder to absorb sweat for children. If talcum powder is applied to the reproductive tract, the dust will stay inside and pass through the muscles. Peristalsis carries the particles into the uterus.

What is asbestos

Chinese name: asbestos English name: a *** estos Definition: The general name for natural fibrous or mineral *** bodies that can be split into fibrous forms.

According to the chemical composition and crystal structure of minerals, it can be divided into serpentine asbestos, amphibole asbestos, brucite asbestos, palygorskite asbestos, sepiolite asbestos, pyrophyllite asbestos, etc. Asbestos is a general term for six natural fiber minerals with commercial uses.

The term asbestos is not a mineralogy, but a commercial term, which refers to mineral products with high tensile strength, high flexibility, resistance to chemical and thermal attack, electrical insulation, and spinnability. . Asbestos is composed of fiber bundles, which in turn are composed of very long and thin fibers that can be separated from each other.

Asbestos can be divided into two categories: serpentine asbestos (chrysotile asbestos) and amphibole asbestos. [1] Asbestos has been used for weaving for a long time. In the Zhou Dynasty of China, asbestos fiber could be used to make fabrics. Because after being stained and burned by fire, it will become as white as new, so it is called fire cloth or fire cloth.

Asbestos is highly fire-resistant, electrically insulating and thermally insulating, and is an important fire-proof, insulating and thermal insulation material. At present, there are nearly 3,000 kinds of asbestos products or products containing asbestos, which are mainly used in mechanical transmission, braking, heat preservation, fire prevention, heat insulation, anticorrosion, sound insulation, insulation, etc. The more important ones are automobiles, chemical industry, electrical equipment, construction industry and other manufacturing sectors.

[1] Because asbestos fibers can cause diseases such as asbestosis and pleural mesothelioma, many countries have chosen to completely ban the use of this dangerous substance, and some other countries are reviewing the dangers of asbestos. Therefore, it is very worrying that asbestos nets are still used in chemistry laboratories in middle and high schools in China.

What is asbestos? What is collodion?

Asbestos is the general name for six natural fiber minerals with commercial uses.

The term asbestos is not a mineralogical but a commercial term for mineral products that have high tensile strength, high flexibility, resistance to chemical and thermal attack, electrical insulation, and spinnability. Asbestos is composed of fiber bundles, which in turn are composed of very long and thin fibers that can be separated from each other. Asbestos can be divided into two categories: serpentine asbestos (chrysotile asbestos) and amphibole asbestos. Asbestos has been used for weaving for a long time. In the Zhou Dynasty of China, asbestos fiber could be used to make fabrics. Because after being stained and burned by fire, it becomes as white as new, so it is called fire cloth or fire cloth.

Because asbestos fibers can cause diseases such as asbestosis and pleural mesothelioma, many countries have chosen to completely ban the use of this dangerous substance, and other countries are reviewing the dangers of asbestos.

Guncotton

It is a white fibrous substance with basically the same physical properties as cotton; its explosive power is 2 to 3 times greater than black powder and can be used in the military , so it is called "guncotton". However, the explosion speed of collodion is too fast, even faster than picric acid. If it is made into a cannonball, it will explode before being fired from the barrel, which is very unsafe. However, after being treated with an alcohol-ether mixed solvent and rolled into shape, its detonation speed can be significantly slowed down, and it can be used as a propellant for bullets and artillery shells or as a component of solid rocket propellant

Rockwool What is the difference from asbestos? Inner Mongolia rock wool board

First of all, their names are different, one is stone and the other is rock! Asbestos is a general term for natural fibrous siliceous minerals. It is a silicate mineral fiber widely used in building materials and fireproof boards. It is also the only natural mineral fiber. It has good tensile strength and good thermal insulation. It has anti-corrosion properties and is not easy to burn, so it is widely used.

Asbestos itself is not toxic. Its greatest harm comes from its fibers. When these tiny fibers are released, they can float in the air for a long time and be inhaled into the human body. The inhaled asbestos fibers can last for many years. It accumulates in the human body, adheres to and deposits in the lungs, causing lung diseases. Rock wool is a man-made fiber made from selected basalt and diabase as the main raw materials, plus a certain amount of auxiliary materials, and is melted and blown at high temperature. It is non-combustible, non-toxic, light, low in thermal conductivity and has good sound absorption properties. , insulation, good chemical stability, long service life and other characteristics, it is an ideal thermal insulation material recognized at home and abroad.

The main types include rock wool boards, rock wool felts, rock wool belts, rock wool pipe shells, etc. Asbestos deposits occur in ultrabasic rocks or metamorphic dolomites.

Asbestos occurs in rock cracks that are several millimeters or centimeters wide, forming veins, and the ore body is composed of clusters of veins. Serpentine asbestos is widely distributed, accounting for 95% of total asbestos production.

It is mainly formed in the contact zone between intrusive bodies and dolomite or dolomitic limestone and in the network cracks of serpentinite formed by metamorphism of ultrabasic rocks. Amphibole asbestos is mostly formed under dynamic metamorphic conditions by providing sodium and magnesia from hydrothermal fluids to replace iron-containing siliceous rocks.

The largest deposits of serpentine are located in the Ural Mountains of the Russian Federation.

What is asbestos? How important is it?

Asbestos is a general name for fibrous silicate minerals that can be split into long, flexible fibers and can be used. Asbestos can be divided into two categories: serpentine asbestos (chrysotile asbestos) and amphibole asbestos. Asbestos in the narrow sense refers to tremolite asbestos and actinolite asbestos. The difference between serpentine asbestos and amphibole asbestos is: grind the asbestos in a mortar, serpentine asbestos will form a chaotic felt mass, and the fibers are difficult to separate, while amphibole asbestos will easily break into many small fibers after grinding. Asbestos without iron appears white, while asbestos containing iron appears in different shades of blue. Fibrous 100% body silky sheen.

Serpentine asbestos is widely distributed, accounting for more than 95% of asbestos production. It is mainly formed in the contact zone between intrusive rocks and dolomite or dolomitic limestone and in the metamorphic process of ultrabasic rocks. In the network fissures of serpentinite. Amphibole asbestos is mostly formed by hydrothermal fluids providing sodium and magnesium to replace iron-containing siliceous rocks under dynamic metamorphic conditions. Asbestos is often used in materials that are heat-resistant, insulating, acid-resistant, and alkali-resistant. Shimian County in Sichuan Province and Mangya County in Qinghai Province, China are famous producing areas of asbestos.

Asbestos has been used for thousands of years. As early as the Spring and Autumn Period and the Warring States Period in our country, it was recorded in Liezi's Book: "If the cloth is covered with fire, the cloth will be thrown into the fire. The color of the cloth will be the color of the fire. If it is vibrated by fire, it will be as bright as snow." It shows that at that time, the working people of our country used asbestos to weave cloth for fire prevention.

After thousands of years of development of human science and technology, asbestos, as an industrial raw material or material, has become more widely used and important. There are currently nearly 3,000 types of asbestos products or products containing asbestos, used in more than 20 industrial sectors. The more important ones are the automobile, tractor, chemical industry, electrical equipment and other manufacturing sectors. Mainly using higher-grade asbestos fibers to weave yarn, thread, rope, cloth, packing, etc., as materials or linings for transmission, thermal insulation, heat insulation, insulation and other components. Medium and low-grade asbestos is widely used in the construction industry Fiber is mainly used to make asbestos boards, asbestos paper fireproof boards, insulation pipes and kiln mats, as well as thermal insulation, heat protection, insulation, sound insulation and other materials. Asbestos fibers can be mixed with cement to make asbestos cement products such as asbestos cement tiles, boards, roof panels, asbestos pipes, etc., which are widely used in various construction projects instead of large amounts of steel. Mixing asbestos and asphalt can make asbestos asphalt products, such as asbestos asphalt boards, cloth (linoleum), paper, bricks, liquid asbestos paint, putty for filling cement pavement and expansion cracks, etc., as waterproofing and waterproofing of high-end buildings. Thermal insulation, insulation, acid and alkali resistant materials and indispensable materials for transportation engineering. In the defense industry, asbestos is bonded with phenolic, polypropylene and other plastics, and can be made into rocket anti-ablation materials, aircraft wings, fuel tanks, rocket tail nozzle tubes and torpedo high-speed launchers, large and small ships, car bodies, aircraft, tanks, etc. Sound insulation and heat insulation materials in ships, asbestos and various rubbers can also be made into sealing materials for liquid rocket engine connectors after being mixed and molded. Asbestos and phenolic resin laminates can be used as heat-proof materials for missile heads. Blue asbestos can also be used as linings, partitions or filters to protect against chemicals and atomic radiation, as well as acid-resistant packing and rubber sheets.