Classifications

• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
  • C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
  • C10B57/04—Other carbonising or coking processes; Features of destructive distillation processes in general using charges of special composition
  • C10B57/06—Other carbonising or coking processes; Features of destructive distillation processes in general using charges of special composition containing additives

Definitions

• the strength of coke is one of the important properties required in metallurgical coke employed in iron making fields and the like. For this reason, many plans as how it may be improved have been proposed and put into practice. It is, for example, well known that medium hard pitch which approximate to chemical quality of the coking coal, anthracite, oil coke which is useful as an aggregate or ferro-coke which is produced by mixing the calcined iron ore with a coking coal, is added to the coking coal or blended coal.
• the addition of said pitches may be suitable as a promoting agent for fluidity of the coal when the rate of operation of the oven is low and the carbonization temperature is less than 1200C.
• the temperature is more than l200C, it deposites carbon on the wall of the oven whereupon the thermodecomposition in said oven becomes violent and may interfere with the exhausting of gases and the pushing operations of said oven. This fact increases a tendency to the generation of bubbles in said coke and consequently may bring about the lowering of its strength.
• the addition of inactive materials such as anthracite, the similar coal, powder coke, oil coke, mineral material or the like is useful to a coal having caking power and with fluidity as the existance of a nucleus, consequently may be used for the improving of said strength.
• inactive materials such as anthracite, the similar coal, powder coke, oil coke, mineral material or the like is useful to a coal having caking power and with fluidity as the existance of a nucleus, consequently may be used for the improving of said strength.
• the addition of the above inactive materials should be limited because the addition interferes with the caking power.
• This invention has been developed to remove the above disadvantages.
• the features of this invention lie in the improving of coke properties by means of adding a wire like or a small piece of metallic or non-metallic material to coking coals or blended coals. It is needless to say that such a method is essentially different from said prior art.
• an object of this invention is to provide a method of improving the strength of coke produced with coking coals or blended coals.
• This present method can promote a caking power peculiar to the blended coals with ease.
• Another object of this invention is to provide a method of reinforcing the coking of blended coals at the stage of said carbonization and of being possible to prevent the crush of said coke, which is apt to occur at the removing, storing and charging stages.
• wire like or small pieces of metallic materials including steel, stainless steel, copper and the like and carbon fiber, carbon rich synthetic resin and the like aswire like or small piece of non-metallic materials.
• metallic materials including steel, stainless steel, copper and the like and carbon fiber, carbon rich synthetic resin and the like aswire like or small piece of non-metallic materials.
• the above materials do duty for linking up cracks of coke which are apt to occur at the stage of said carbonization.
• the coking is promoted with said heat transfer because said material supplied heat to nearly coals.
• the tightening of said coke is strengthened. while the carbonizing velocity is stepped up, it may be expected that the graphiting is advanced by the equalizing of thermal distribution.
• the above mentioned effects reach the maximum. That is, the diameter of said material is selected within the range of from 0.1 mm to 0.8 mm and the length, within the range of 2 mm to mm. Such materials should be added within the amount of from 0.01% to 0.5% by weight, preferably 0.03% to 0.3% by weight.
• the section of said wire like materials is circular. If the dimensions are within the abovementioned range, a small piece which is cut from sheet materials as steel sheet may be also employed. Accordingly, it is needless to say that wire rod or turning scrap is also suitable materials as the wire like materials of this invention.
• said adding materials are so limited as mentioned above, are as follows; that is, when said material is too small, it tends to be melted in an elevated temperature, e.g. more than l300C and when said material is too big, it gives a bad influence to its combinability for said blended coals.
• the limit of the length is based on the similar reasons. When it is too short, said material tends to be melted and when it is too long the grain size of said coke will become difficult to be controlled.
• the added amount of said materials is less than 0.01% by weight, said combination effects are lessened andsaid. heat transfer effects are also lowered. Conversely, even though the amount is too much, there is little trouble.
• said added amount should be limited to a certain value on the basis of its economical consideration. For example, when the produced amount of coke reaches 250,000'lmonth, said wire like material of 2,500t/month will be required by adding rate of 1% by weight. Even though said material is steel wire which is possible to be obtained with ease, it is not easy to prepare such a great deal of said wire rod. This is a reason that said adding amount is limited to less than 0.5% by weight.
• the coke properties according to this present method are excellent as shown in the following examples. That is, the strength of about 1.0% by drum index and of about 6% by shatter index 50 m/m is possible to be obtained with ease.
• a method of producing metallurgical coke characterized by equally distributing and mixing a wire-like material to and with coking coals which is charged into said oven, wherein the width of said wire-like material is within the range of 0.1 to 0.8mm, and length of said material is within the range of 2 to l50mm, and the adding amount of said material is within the range of 0.01 to 0.5% by weight.

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Oil, Petroleum & Natural Gas (AREA)
• Organic Chemistry (AREA)
• Coke Industry (AREA)

Applications Claiming Priority (1)

Publications (1)

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Family Applications (1)

Country Status (6)

Cited By (2)

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Citations (5)

• 1970
  • 1970-05-11 JP JP45039247A patent/JPS491921B1/ja active Pending
• 1971
  • 1971-05-07 US US141394A patent/US3878052A/en not_active Expired - Lifetime
  • 1971-05-10 GB GB1408171*[A patent/GB1343691A/en not_active Expired
  • 1971-05-10 IT IT50222/71A patent/IT942099B/it active
  • 1971-05-11 FR FR7117001A patent/FR2091462A5/fr not_active Expired
  • 1971-05-11 DE DE2123313A patent/DE2123313C3/de not_active Expired

Patent Citations (5)

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