Is graphite harmful to the body?

Overview of graphite

Graphite is an allotrope of carbon,a gray-black opaque solid.It has stable chemical properties,corrosion resistance,and is not easy to react with chemicals such as acids and alkalis.It burns in oxygen to generate carbon dioxide,which can be oxidized by strong oxidizers such as concentrated nitric acid and potassium permanganate.It can be used as an antiwear agent and lubricant. High-purity graphite is used as a neutron moderator in atomic reactors and can also be used to make crucibles. Electrodes, brushes,dry batteries,graphite fibers,heat exchangers,coolers,electric arc furnaces,arc lamps, pencil refills,etc.

Graphite is relatively non-toxic.There may be no symptoms.If symptoms do occur,they may include stomach pain and vomiting,which may be caused by intestinal obstruction (obstruction).When swallowing a pencil,one may suffocate.

Graphite applications

1.Used as a refractory material:Graphite and its products have the characteristics of high temperature resistance and high strength.It is mainly used to make graphite crucibles in the metallurgical industry,and is often used as a protective agent for graphite in steelmaking.As the inner lining of metallurgical furnace.

2.As a conductive material:used in the electrical industry to manufacture electrodes,brushes,carbon rods, carbon tubes,positive electrodes of mercury positive current devices,graphite washers,telephone parts,TV picture tube coatings, etc.

3.As a wear-resistant lubricating material:Graphite is often used as a lubricant in the machinery industry. Lubricating oil is generally not usable under high-speed,high-temperature, and high-pressure conditions,while graphite wear-resistant materials can work at (1) high sliding speeds of 200~2000°C without lubricating oil. Many equipment that transports corrosive media widely use graphite materials to make piston cups,seals and bearings.No need to add lubricating oil during operation.Emulsion is also a good lubricant for many metal processing (wire drawing,pipe drawing).

4.Graphite has good chemical stability.Specially processed graphite has the characteristics of corrosion resistance,good thermal conductivity, and low permeability.It is widely used in heat exchangers,reaction tanks, condensers,combustion towers,absorption towers,coolers,and heating Filters and filters.

Pump equipment.It is widely used in petrochemical industry, hydrometallurgy,acid-base production,synthetic fiber,papermaking and other industrial sectors,which can save a lot of metal materials.

5.Used for casting, sand molds,compression molds and high-temperature metallurgical materials:As graphite has a small thermal expansion coefficient and can withstand rapid changes in cold and heat,it can be used as a mold for glassware.After using graphite, ferrous metals can be used to obtain castings with accurate dimensions and smooth surfaces. High, it can be used without processing or only a small amount of processing,thus saving a lot of metal.The production of cemented carbide and other powder metallurgy processes usually uses graphite materials to make porcelain boats for pressing and sintering.The single crystal silicon crystal growth crucible,regional refining vessel, supporting device,induction heater,etc.are all made of high-purity graphite. In addition,graphite can also be used for vacuum smelting graphite insulating plates and substrates,

6.Used in the nuclear energy industry and national defense industry:Graphite is a good neutron moderator used in nuclear reactors.Uranium-graphite reactors are currently the most widely used nuclear reactors.The decelerating materials used as power in nuclear reactors should have a high melting point and be stable.Good performance and corrosion resistance.Graphite can fully meet the above requirements.The purity of graphite used in the atomic reactor is very high,and the impurity content should not exceed dozens of PPM,especially the boron content should be less than 0.5 PPM.In the defense industry,graphite is also used to manufacture solid fuel rocket nozzles,missile nose cones,parts of aerospace equipment,thermal insulation materials and radiation protection materials.

7.Graphite can also prevent boiler fouling.Tests by relevant departments have shown that adding a certain amount of graphite powder (approximately 4 to 5 grams per ton of water) can prevent scaling on the boiler surface.In addition, graphite coatings on metal chimneys,roofs,bridges and pipes can prevent corrosion and rust.

8.Graphite can be used as pencil lead,pigment and polishing agent.After special processing, graphite can be made into various special materials for use in related industrial fields.

9.Electrode,why graphite can replace copper as electrode?

In the 1960s,copper was widely used as an electrode material,with a utilization rate of about 90%,while graphite was only 10%.In the 21st century, more and more users begin to choose graphite as the electrode material. In Europe,more than 90% of electrode materials are graphite.Copper,which was once the main electrode material, has almost lost its advantages compared with graphite electrodes.What caused this huge change? Of course, graphite electrodes have many advantages.

(1) Faster processing speed:Under normal circumstances,the processing speed of graphite can be 2 to 5 times faster than that of copper;while the speed of electrical discharge machining is 2 to 3 times faster than that of copper;

The material is not easy to deform:it has obvious advantages in the processing of thin rib electrodes;the softening point of copper is about 1000 degrees,which is easily deformed by heat; the sublimation temperature of graphite is 3650 degrees;the thermal expansion coefficient is only 1/30 of copper.

(2) Lighter weight:The density of graphite is only 1/5 that of copper.When large electrodes are used for electrical discharge machining,it can effectively reduce the burden of machine tools (EDM);it is more suitable for large molds in the following situations.

(3) Discharge consumption is small; because the spark oil also contains C atoms,during the electric discharge machining,the high temperature will decompose the C atoms in the spark oil,and then form a protective film on the surface of the graphite electrode,which compensates for the loss of the graphite electrode .

(4) No burr;after processing,the copper electrode needs to be manually trimmed to remove burrs.After graphite processing,there is no burr, which saves a lot of cost and is easier to realize automated production;

(5)Graphite is easier to grind and polish;since the cutting resistance of graphite is only 1/5 of copper, manual grinding and polishing is easier;

(6)The material cost is lower and the price is more stable;due to the increase in copper prices in recent years, the price of isotropic graphite is now lower than that of copper. In the case of the same quantity, Toyo Tanso's general price graphite products is 30% lower than copper. %~60%, and the price is relatively stable, short-term price fluctuations are very small.

It is this unparalleled advantage that graphite has gradually replaced copper as the material of choice for EDM electrodes

New uses of graphite

With the continuous development of science and technology, people have also developed many new uses of graphite.

Flexible graphite products. Flexible graphite, also known as expanded graphite, is a new graphite product developed in recent years.

The United States successfully studied flexible graphite sealing materials and solved the problem of leakage of atomic energy valves. Subsequently, Germany, Japan and France also began to develop and produce. In addition to the characteristics of natural graphite, the product also has special flexibility and elasticity.

Therefore, it is an ideal sealing material. It is widely used in petrochemical, atomic energy and other industrial fields. International market demand is increasing year by year.

In addition, graphite is also a polishing agent and rust inhibitor for light industrial glass and papermaking. It is an indispensable raw material for making pencils, inks, black paints, inks, synthetic diamonds and diamonds. Energy-saving and environmentally friendly materials, the United States has used it as a car battery. With the development of modern science and technology and industry, the application fields of graphite are still expanding. Graphite has become an important raw material for new composite materials. Materials in the high-tech field and play an important role in the national economy.

Graphite price

The price of graphite varies randomly with production costs, transportation costs, international conditions, exchange rates, and market supply and demand. Tanki New Materials Co.,Ltd aims to help all industries and chemical wholesalers find high-quality, low-cost nanomaterials and chemicals by providing a full set of customized services. If you are looking for graphite, please feel free to send an inquiry about the latest price of graphite .

Supplier of graphite

As a global spherical graphite supplier, Tanki New Materials Co., Ltd. has extensive experience in the performance, application and cost-effective manufacturing of advanced engineering materials. The company has successfully developed a series of powder materials (including oxides, carbides, nitrides, single metals, etc.), high-purity targets, functional ceramics and structural devices, and provides OEM services.

 If you are looking for high quality spherical graphite powders, please feel free to contact us and send an inquiry. (sales@ozbo.com).