Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
  • B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
  • B22D27/06—Heating the top discard of ingots

Definitions

• This invention relates to an improvement in or relating to an antipiping compound and to a process for the heat retaining of hot top surface during ingot making.
• the antipiping compound and the process for heat retaining of the hot top surface in accordance with this invention aim at increasing the heat-retaining effect than those conventionally realized and providing an economical antipiping compound and heat-retaining process.
• the present invention is to provide an antipiping compound for use in ingot making, which is made by essentially containing more than 5 percent by weight of coffee grounds in components selected from the group consisting of easily oxidized metal powders, powdery metal oxide, carbonaceous materials, fibrous materials, fluorides, nitrates, nonporous and porous refractory materials and other effective materials.
• this invention is to provide process in which compositions selected from the group consisting of easily oxidized metal powders, powdery metal oxide ones, carbonaceous materials, fibrous materials, fluorides, nitrates, nonporous and porous refractory materials and other effective components are prepared, molten steel is poured into the mold provided with a heat-retaining moulding for hot top consisting of exothermic or heat-insulating compositions, the aforesaid compositions are added to the top of said molten metal immediately after the completion of said pouring, and the coffee rounds is added thereon to heat-retain the hot top during the ingot making.
• this invention is to provide the process in which molten steel is poured into the mold provided with an exothermic or heat-retaining moulding for hot top, and the coffee grounds is added to the top of the molten steel immediately after the completion of said pouring to heat-retain the hot top during the ingot-making.
• the heat-retaining material and the process for heat retaining in accordance with this invention relate each to use, during ingot making, together with the mold, the top of which or inner portion of the upper portion of which is provided with an exothermic or heat-retaining moulding for hot top.
• the coffee grounds used in this invention is one exhausted during the process for making taste drinks in which coffee beans is roasted to be ground, and the resulting grains are extracted with hot water at high pressure and temperature to take up an extract containing more than 30 percent of a solid matter.
• the oil content (ether-extract) and the carbonaceous content are generally contained in amounts of about percent and about 60 percent by weight, respectively, and thus they are materials having high calorie as compared with sawdust, having as high as approximately 6,300 cal/g. As they burn well, they are easily available in great amounts, and inexpensive, it is found that they are quite suitable material for antipiping compound.
• the easily oxidized metal powder as the exothermic basic material used for the heat-retaining compound of exothermic composition is metallic aluminum powder and its fine grains,
• Fluorides such as sodium, sodium aluminum fluoride, etc. are used as exothermic reaction promoter.
• Nitrates as ignition agent according to this invention include sodium, potassium and barium nitrates.
• the nonporous refractory materials include aluminum oxide, aluminum residual ash, magnesium oxide, etc.
• the porous oxides involve diatomaceous earth, pumice, heat-expansible or expanded vermiculite, obsidian, perlite, silex, shale, etc.
• calcium borate is sometimes used, and other materials are used which are effective for heat retaining hot top and not attack the ingredients of the molten steel.
• This invention is characterized in that the coffee grounds are indispensably employed as component of the antipiping compound for ingot making by mixing it in the exothermic antipiping compound selected from the crude materials as above mentioned either by admixing it in the latter or by using it together or independently with the latter.
• Powder Fine grain A 3 mold of which inner sectional shape is square and whose upper inner face is provided with a heat-retaining molding for a hot top of the same composition and shape with the top and made to 9.6 percent the hot top capacity is prepared by pouring molten steel therein, and comparison is made of the cases in which the heat-retaining materials having the compositions, No. l-No. 5, shown in table 1 are added by 6 kg. each to the top surface of the molten steel immediately after the pouring completed, with those in which the antipiping compounds having the compositions same as those described in table 1 excepting that the coffee grounds are replaced by sawdust. The result as shown in table 2 are added by 6 kg. each.
• the heat-retaining process for a hot top i.e. the addition of coffee grounds, improves the mean yields in ingot making by 0.35 percent and 0.53 percent of having same as compared with the additions of straw ashes and chafi",
• compositions as those p i ly shown in table I excepting the come The coffee grounds which are to be admixed to the exothergrounds are replaced by me antipiping compound for use in steel ingot making accordsawdusi 859 ing to this invention should be employed by more than 5 percent by weight. Although some effect may often be obtained TABLE 4.-COMPARISON OF YIELDS IN INGOT MlKING (PERCENT) Classification No. 1 No.2 No.3 No. 4 N0. 5 No.6 No. 7 No.8 Mean Use of 40 kg. or cofiee grounds 86. 2 86. 0 86.3 86.1 86.1 86.4 86. 0 86. 2 86. 26 Use of 40 kg. of straw ashes 85.7 85.8 85.8 85. 7 85.9 85.8 85.6 85.5 85.73 Use 0M0 kg. ofehafi 85.9 85.9 86.2 85.8 86.0 85.8 85.8 85.9 85. 91
• Table 2 shows a mean yield of 30 ingot makings in each by the addition of less than 5 percent by weight, apparent efnumber.
• the heat-retaining materials wherein coffee grounds feet can be confirmed by the addition of more than 5 percent are contained according to this invention improve the yields in by weight. ingot makings by 0.7-1.2 percent, i.e. 0.96 percent in mean T BX h rmi n ipiping C mpound and the proces for value, as compared with those in which for example sawdust is 30 h a ai g accor i g o h s n en n are characterized in used in place of coffee grounds are equal in amount. that coffee grounds are employed either by being admixed or by being used together or independently.
• the coffee grounds EXAMPLE?- exhibit superior heat-retaining effect than or equal to that conventionally attained either by admixing it to or by using it A mold of which Secnonal Shape square and together with the heat-retaining material, and can reduce the whose upper inner face is provided with aheat-retaining moldcost for the heat retaining material being y economic a.
• a heat-retaining process for heat retaining hot top during possible reducnon of the mgot making cost ingot making which comprises pouring molten steel into the EXAMPLE 3 mold provided with a heat-retaining molding consisting of exothermic or heat-insulating composition and adding coffee
• a 18! mold of which inner sectional shape is flat and has a grounds on the top surface of molten steel immediately after ratio of the length to the width of 1:1.9 is provided with a heatthe completion of said pouring of the molten steel.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Continuous Casting (AREA)
• Mold Materials And Core Materials (AREA)
• Curing Cements, Concrete, And Artificial Stone (AREA)
• Ceramic Products (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=13063738

Family Applications (1)

Country Status (9)

Cited By (7)

Citations (2)

Family Cites Families (1)

• 1970
  • 1970-07-03 JP JP45057719A patent/JPS4946451B1/ja active Pending
  • 1970-11-12 GB GB5393770A patent/GB1337566A/en not_active Expired
  • 1970-11-12 SE SE7015319A patent/SE375028B/xx unknown
  • 1970-11-13 US US89455A patent/US3612155A/en not_active Expired - Lifetime
  • 1970-11-17 ZA ZA707755A patent/ZA707755B/xx unknown
  • 1970-11-20 CA CA098,695A patent/CA939396A/en not_active Expired
  • 1970-11-27 DE DE2058308A patent/DE2058308C3/de not_active Expired
  • 1970-11-30 FR FR7043006A patent/FR2097155B1/fr not_active Expired
  • 1970-12-07 AT AT1103270A patent/AT317457B/de not_active IP Right Cessation

Patent Citations (2)

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