1. The calcium Carbide in Metallurgy :
The Calcium carbide is a very strong reducing chemical. At the same time, it can also used as an energy source .this method is most used in metallurgy which is used to reduce costs using various methods.
In modern steelmaking operations and due to the increase in the process of casting parts through molding, the demand for low sulfur steel has increase As a result, the demand for calcium carbide consumption increases which is used for desulfurization of metal.
In addition, the reaction of the calcium carbide with oxides produces a large amount of heat that is highly retained in the process. This can increase metallurgical efficiency. In addition, the calcium carbide as an energy source an bring more economic aspects.
- 1-1 Desulfurization (direct)
In modern steel factories, steel with less sulfur content is needed, because the demand for making molded parts has increased. As a result, since calcium carbide can reduce the amount of sulfur in metal in the best way, it has a lot of consumption in the steel industry.
But in steel factories, this method uses magnesium to separate some of the sulfur from the molten metal when it is transferred to the crucible. Then, using calcium carbide, any remaining amount of sulfur is removed from the molten metal. In factories that molten iron is used, before the iron is injected into the desired mold, it must be desulfurized. This type of desulfurization is usually done by adding calcium carbide grains into the molten iron.
The degree of purity and the size of grains are considered very important factors in the efficiency of calcium carbide application. The size of the calcium carbide grains are carefully selected so that there is the greatest contact surface without losing the grain.
The Carbide Industries produces four different sizes of calcium carbide to meet the needs of customers. These products, which have a special formula, make unreacted calcium carbide not remain or less in the welding slag. For the injection of materials in the following layers, calcium carbide powder is used whose grain size is less than 105 microns. Then calcium carbide powder can be mixed with various types of other industrial/chemical powders.
- 1-2 Slag Conditioning
The calcium Carbide is an essential tool for the removal of unwanted iron oxide from furnace slag that is carried into the ladle during tapping. When added to the liquid metal stream, or to the ladle after tapping, a coarser grained carbide reacts with the oxides and recovers iron and expensive alloys that otherwise would have been lost. Furthermore, left untreated, these oxides can interfere with the downstream steel refining operation by inhibiting desulfurization, oxidizing ("fading") alloy additions, and attacking refractories.
Although aluminum, ferrosilicon, silicon carbide and even coke have also been used for this purpose but calcium carbide has proven to be more economical, more efficient, and more reproducible in its effects. This is due to the fact that unlike the other materials, calcium carbide produces CO gas which uniformly distributes and mixes the carbide while foaming the slag; does not require a balancing lime addition as do silicon-based additives (in fact every pound of carbide adds about one pound of lime); reacts exothermically (producing heat) to not chill the slag; and under typical conditions does not dissolve in steel producing practically no carbon pick-up, no unexpected deoxidation , and nearly 100% utilization.
For this application, calcium carbide industries can produce calcium carbide in desired sizes to meet the needs of customers.
- 1-3 Furnace Injection
Carbide has a unique ability to react with metal oxides, without adversely affecting the chemical properties of steel. At the same time, significant energy is added to the process. In electric arc furnaces, the energy produced during oxide reduction is produced by the production of heated lime particles and CO gas. These items help to retain heat and also convert slag into foam. In addition, because most of the slag generated in the electric arc furnace does not remain inside the ladle, all the capabilities of calcium carbide can be used. As a result of these measures, energy efficiency increases and the alloy recycling process in the electric arc furnace is done faster. It produces carbide in larger sizes for furnace injection of carbide industries. which is more suitable for transfer to the furnace through compressed air flow. Of course, this will be done with neutral gas.
2. The Carbide in Chemical industry
Calcium carbide is converted into acetylene in a controlled reaction with water using an apparatus called a generator. Acetylene, which has the chemical formula C2H2, is an extremely useful hydrocarbon due to the energy that is locked up in the triple-bond between the carbon atoms. This energy is then released and utilized in different ways by our customers for a variety of industrial purposes.An acetylene cylinder for cutting and welding purposes is perhaps the most recognizable use, but many important chemicals are derived from acetylene.When calcium carbide is reacted with water to produce acetylene, it produces calcium hydroxide, itself a useful chemical. Having a pH of 12.4 and a ready reactivity with sulfur. it is widely used for acid neutralization, pH modification of soil, and for the cleaning of sulfur emissions from industrial processes and power generators.
- 2-1 Acetylene
The combination of calcium carbide with water leads to the production of acetylene gas. Acetylene gas, which is the smallest member of the alkynes family, has the chemical formula C2H2, in which two carbon atoms are connected by a triple bond, therefore, acetylene is considered a component of unsaturated compounds. While calcium carbide is utilized directly as a process material, its major use and perhaps its greatest versatility is realized when the rock-like substance is reacted with water to produce acetylene and calcium hydroxide. The unique chemistry of the triple-bonded carbon in the acetylene molecule allows for a variety of useful chemical reactions to form intermediates which are used in the manufacture of a diverse range of chemical derivatives.Acetylene derivatives are used in a variety of everyday consumer products, including hair sprays, cosmetics, tabletted drugs, sun screens and lotions, antiseptics, and tartar-control toothpastes. In addition, acetylene intermediates provide the basic feedstock for the production of polyurethane fibers, synthetic rubber, perchloroethylene (a widely used dry cleaning solvent), trichloroethylene (a degreasing solvent used in metal working processes), and a new type of refrigerant gas which is designed to replace the environmentally damaging chlorinated fluorocarbons (CFC's) currently in widespread use.
- 2-2 Cutting and Welding
Among the many uses of acetylene gas, the largest and perhaps the most familiar is its use in the form of cylinder gas for metal fabrication and construction. When combined with oxygen in an oxyacetylene torch, acetylene produces a flame temperature in excess of 6,000 degrees F, the hottest flame of all hydrocarbon gases. This provides the means to cut or join many types of metal, cleanse them of surface imperfections, and strengthen them through flame hardening. In addition, acetylene is lighter than air and is therefore the safest fuel gas to use in confined spaces, below ground, or on ships.
3. The Environment
A co-product of the acetylene generation process, calcium hydroxide is extremely useful in a variety of industrial applications. Perhaps the most famous use of our calcium hydroxide is in the scrubbing of stack gases from fossil-fueled power plants to remove sulfur compounds before release to the air.In addition, steelmakers use calcium hydroxide to neutralize waste pickling acid, and chemical manufacturers to neutralize waste streams; while municipalities use it to treat sewage and builders to make sand-lime brick. Carbide Industries is a major supplier of this product, which is available in both dry and slurry forms.Calcium hydroxide is easily spreadable and sprayable over large tracts of land. In this way farmers use our carbide lime to neutralize the affects of acid rain, and mines use it to neutralize acidic water runoff. If it is used in a certain amount and appropriate sizes . Calcium hydroxide is combined with soil and a mixture with the strength of concrete is created. The stabilizing reaction is used in the fields of construction, bed and road coating. Calcium carbide packingThe packaging line of this company is able to provide variable packaging with multiple uses, which is easy to maintain the safety of transportation.In general, packaging is provided to customers in the form of bulk bags and sealed barrels, and it is sent only to steel factories in the form of big bags and 50 kg sealed barrels.
