CN100484664C - Energy-saving and environment-protecting type method and aparatus for producing cobalt sheet - Google Patents
Energy-saving and environment-protecting type method and aparatus for producing cobalt sheet Download PDFInfo
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- CN100484664C CN100484664C CNB2005101027623A CN200510102762A CN100484664C CN 100484664 C CN100484664 C CN 100484664C CN B2005101027623 A CNB2005101027623 A CN B2005101027623A CN 200510102762 A CN200510102762 A CN 200510102762A CN 100484664 C CN100484664 C CN 100484664C
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Abstract
The present invention provides a method of energy-saving and environment-protecting type for producing a cobalt sheet, wherein used raw materials are cobalt powder containing more 99.3 percent of cobaThe energy - saving and environment protection method of the cobalt piece producing is disclosed, which comprise preforming and reduced sintering. The cobalt piece is made from 99.3% cobalt powder thrlt. The method procedure comprises two processes of preforming and reduced sintering, wherein the cobalt powder is made into a cobalt sheet by the processes of the preforming and the reduced sinteringough above craftwork, and there hasn't pollution during the producing process, it also reduces the energy consumption compare to the present electrolysis craftwork, the cobalt piece can compare beauty. The cobalt powder is used for being made into the cobalt sheet by preforming and reduced sintering technology, so that no pollution in production; compared with the existing electrolysis technology with the product by electrolysis craftwork due to special parameter design of every operation technology in the working procedure. AT the same time, the invention also provides relational manufacturefor preparing the cobalt sheet, the preforming and reduced sintering technology greatly reduces energy consumption. Furthermore, the present invention particularly designs the operation and operating equipment for easy to realize above craftwork. parameters of each section in each procedure, so that the performance of the cobalt sheet which is manufactured by the method of the present invention is as better as the cobalt sheet which is manufactured by an electrolysis method. By matching with the technology, the present invention also provides an apparatus which is matched with the method for producing the cobalt sheet, and the apparatus can cause the technology to be better realized.
Description
Technical field
The invention provides a kind of production method of cobalt sheet, especially a kind of method of energy-saving and environment-protecting type for producing cobalt sheet; The present invention also provides above-mentioned production cobalt sheet used equipment.
Background technology
The metallic cobalt sheet is a kind of very important raw material of industry, and it is to make the unique cobalt additive that uses in the cobalt product process in the melting mode.Along with deepening continuously of modernization, the cobalt product that smelting process is produced, as the samarium-cobalt alloy in the magnetic material, nickel cobalt (alloy), materials such as hydrogen bearing alloy of being made up of rare earth element, cobalt and nickel element and various cobalt alloy steel are applied more and more widely; The cobalt sheet still is a kind of catalyst of having many uses.Thus, the demand of metallic cobalt sheet is also increasing.
The production method of metallic cobalt sheet is an electrolysis in the prior art.Normally make thick cobalt anode as raw material with nickel electrowinning cobalt slag or pyrite cinder etc., obtain electrolytic cobalt through dissolving anode electrolysis method at negative electrode, perhaps make refining cobalt chloride solution, on negative electrode, obtain electrolytic cobalt through the electro-deposition of insoluble anode electrolysis cobalt with above-mentioned raw materials.Then electrolytic cobalt is scraped from negative electrode and form the cobalt sheet.Electrolysis legal system cobalt sheet can obtain the very high cobalt sheet of purity, and still, the electrolysis energy consumption is very high, and simultaneously, electrolysis process is also quite serious to the pollution of environment.The modernized industrial production requirement of the production technology of this high energy consumption, heavily contaminated and friendly environment, energy savings runs in the opposite direction.Therefore, in the middle of reality, just have a pair of so sharp-pointed contradiction: on the one hand, in the modern new and high technology to the demand of cobalt sheet in continuous increase, on the other hand, the problem that existing cobalt sheet production technology exists is restricted the production of cobalt sheet.Densely populated, energy scarcity regional do not allow to start the technology of electrolytic process is arranged, produce the industry of cobalt sheet, many now can only be in Gansu, scarcely populated economically underdeveloped areas such as Jiangxi, Sichuan, Xinjiang carry out.At present, also there are not the effective measures of the above-mentioned contradiction of the fine solution of energy in the prior art.
Summary of the invention
The objective of the invention is to address the above problem, a kind of method of energy-saving and environment-protecting type for producing cobalt sheet of pollution-free in process of production, low energy consumption is provided;
Another object of the present invention is to provide the equipment that uses in the method for above-mentioned energy-saving and environment-protecting type for producing cobalt sheet.
The object of the present invention is achieved like this:
The method of energy-saving and environment-protecting type for producing cobalt sheet provided by the invention, this method comprise cobalt powder are pressed into cobalt sheet pressed compact and sinter the reduction of this cobalt sheet pressed compact into cobalt flake products two operations.
The method of energy-saving and environment-protecting type for producing cobalt sheet provided by the invention change cobalt sheet in the prior art can only with the electrolytic cobalt method obtain so fixed pattern be arranged, take by obtaining through compressing tablet and reduction sintering circuit with the raw material cobalt powder with looking for another way.The high energy consumption that the medium-term and long-term insurmountable cobalt sheet of prior art causes with electrolysis production and the problem of heavily contaminated have been solved.Without any pollution, compare with electrolytic cobalt in the technology overall process of preparation cobalt sheet provided by the invention, energy consumption reduces greatly.
The employed cobalt powder raw material of this method can obtain by chemical precipitation and reduction calcine technology, for example, uses CoCl
2Or CoSO
4Make presoma CoCO by the chemical precipitation reaction
3Or CoC
2O
4, again this presoma is reduced calcining, can obtain cobalt powder.This method for preparing cobalt powder is environmental protection, energy-conservation technical process equally.
The cobalt sheet that production method of the present invention is made is to be used for the additive of fusion process or the catalyst in the chemical reaction, and it is different from the product that general powder metallurgy process is produced, and it is very high that difference is that its requirement of strength does not need.And in sintering, for floor space and the minimizing energy resource consumption of enhancing productivity, reduce equipment, numerous cobalt sheet pressed compacts need be piled up usually and send in the sintering furnace.Sintering like this, if the operating condition design is unreasonable, then the cobalt sheet that comes out of sintering can bond together each other, forms one and sticks together.This can make troubles to use; In addition, also have a very important difference, the cobalt sheet that the inventive method is produced is as additive or catalyst, and these application are very high to the requirement of cobalt sheet purity adding.And be used for making the raw material cobalt powder of cobalt sheet, and specific area is big, and its surface can generate cobalt oxide with air reaction.Commercially available cobalt powder is compared with the electrolytic cobalt sheet, has only O
2Content and contain H
2On the amount of O difference is arranged.According to measuring as can be known, in addition, owing to the easy moisture absorption of powder, also there are some moisture in the oxygen content in the cobalt powder in the cobalt powder usually greatly about 0.2-1.0%.If these oxygen and water are sloughed, make the use value of cobalt sheet with reducing this method.How can make the cobalt sheet of making through compressing tablet and sintering process with cobalt powder on purity, to compare favourably with the cobalt sheet that obtains by electrolysis?
For dehydration and deoxidation as much as possible, the present invention is divided into low temperature presintering knot stage and high temperature sintering stage with described reduction sintering circuit, and the heating-up temperature to cobalt sheet pressed compact in the described low temperature presintering knot stage is 200-500 ℃, and be 0.1-5 hour heat time heating time; Described high temperature sintering in the stage heating-up temperature to cobalt sheet pressed compact be 500-900 ℃, be 1-10 hour heat time heating time.
Warm also is set during to the pressed compact sintering in the common powder metallurgical technique, but its time is shorter relatively, and temperature is lower, the purpose in its purpose and low temperature presintering knot stage of the present invention is also different.The purpose of the preheating in the powder metallurgical technique is to slough the additive that adds in metal dust in mold process, this warm also is called the process of coming unstuck.In the production method provided by the invention, cobalt powder is not add above-mentioned additive at pressed compact, therefore, not needing such one is the physical process that additive is heated and volatilizees, the purpose in the low temperature presintering knot stage of setting of the present invention is deoxidation, dehydration, and deoxidation process is a chemical process, and the cobalt oxide in the cobalt powder produces chemical reaction in the reduction sintering process, and the warm of this process and common powder metallurgical technique has the difference of internal.Therefore, usually in the powder metallurgical technique condition in the warm to be used in the processing of this cobalt sheet be inappropriate.The common warm time is shorter, and oxygen and moisture in the cobalt sheet pressed compact are deviate from fully.By the powder metallurgy theory as can be known, along with the raising of sintering temperature, the contact-making surface between the powder particle in the pressed compact can increase gradually, and gap therebetween is more and more littler.Be wrapped in if exist gas to fail again to discharge in the particle gap in the gap between the powder particle, then heat up howsoever, how to prolong sintering time, this gap can not reduce, and promptly gas can't be discharged.If wrapped up more oxygen and moisture in the cobalt sheet that production method of the present invention is made, then in using this cobalt sheet, will can't satisfy instructions for use because of problems such as its purity.The low temperature presintering knot stage provided by the invention, its temperature is higher than the preheat temperature that common powder metallurgy is produced, but under this temperature, powder particle again can't flow and displacement, on the passage that gas can not be overflowed is stifled, therefore, can be by such low-temperature sintering process so that moisture in the pressed compact and oxygen fully overflow.Through experiment test, by such low temperature presintering knot process moisture is all deviate from, 90% oxygen is deviate from.
In method provided by the invention, the high temperature sintering temperature also is significantly less than the normal sintering temperature of common powder metallurgy.In powder metallurgical technique, common sintering temperature is 0.7-0.8 a times of melting point metal, approximately is 1050-1200 ℃, and in the method for the present invention, the heating-up temperature of high temperature sintering in the stage is lower than said temperature.Its reason is, the cobalt sheet that this method is made does not need to have very high intensity because its purposes is limited to and makes additive and catalyst, just can moulding, and have certain density and compactness and get final product.In addition, if temperature is higher, though be lower than the fusing point of cobalt, the fusing point of metal dust is lower than theoretical fusing point, and each cobalt sheet pressed compact surface has fusing, causes boning mutually between the pressed compact.The sintering of lower temperature, the cobalt sheet pressed compact that can avoid being stacked bonds, and helps further dehydration, deoxidation.
Method provided by the invention also has unique characteristics in the compressing tablet process.Can in sintering circuit, deviate from more up hill and dale in order to make oxygen and water in the cobalt sheet, the thickness of the pressed compact that extrudes in the compressing tablet process usually can not be blocked up, also should not be too closely knit, the preferred values of the thickness of the pressed compact that obtains by compressing tablet is the 0.8-3.0 millimeter, the density of pressed compact can be the 30-80% of matter theory density, and density value can be and is 3-6g/cm preferably
3Such pressed compact more helps thoroughly deoxidation, dehydration in described sintering circuit.
Employed cobalt powder in this method, be cobalt content at the cobalt powder more than 99.3%, as the particle diameter of cobalt powder, also be what need to limit among the present invention, if particle diameter is too little, activity is too high, is unfavorable for abundant deoxidation, if particle diameter is too big, then is unfavorable for again being shaped.So the particle diameter of cobalt powder can be at 0.5-100 μ m, optimum grain-diameter is 1-3.0 μ m.
In described sheeting process, described cobalt powder vertically by the rolling formation cobalt of the horizontal clearance sheet pressed compact between the roll of powder rolls, applies stirring in the feeding zone front to cobalt powder, to increase its flowability.
In the described reduction sintering process, in reduction furnace, feed reducibility gas, make the cobalt sheet that is sintered place reducing atmosphere.It can be a hydrogen, the also mist that can form by hydrogen and nitrogen, and the volume ratio of this hydrogen and nitrogen is 1:3 (or obtain this mist by the disassociation ammonia).It can also be CO gas.
The equipment that uses in the method for energy-saving and environment-protecting type for producing cobalt sheet provided by the invention comprises tablet press machine and reduction furnace, described tablet press machine is powder rolls, it comprises frame, on this frame, be horizontally disposed with a pair roller, be provided with a gap therebetween, be provided with the cobalt powder feeding funnel on this frame, the top in gap between the described roll is located in its underpart outlet; In this feeding funnel, be provided with spiral shaft, fix on this feeding funnel;
Described reduction furnace is that multisection type pushes away boat, it comprises low-temperature sintering chamber, high temperature sintering chamber and cooling chamber, each chamber links together by tube connector, forming one in pushing away boat can be by the tubular conduit of each chamber, in this tubular conduit, be provided with several material boats each other in contact, be provided with the material boat propulsion plant that the material boat can be pushed in the described tubular conduit in the import department that pushes away boat, in described heater and temperature detection and the adjusting device of in each sintering chamber, being provided with, provide required temperature in order to give each chamber; In described each chamber, also be provided with one or more air inlets and exhaust outlet; Be provided with cooling device in the described cooling chamber.
Very crucial in the sheeting process is will guarantee that cobalt powder is stable, be transported in two gaps between the roll continuously.For this reason, in described feeding funnel, be provided with shaft.If by manually directly cobalt powder being added in the feeding funnel, the accumulation shape of material in feeding funnel may be just irregular, like this, the discharging in the discharging opening also just can not be very even.Appearance for fear of this problem, on feeding funnel, add the branch hopper, its below is provided with 2 discharging openings, connect a discharge nozzle on it respectively, these two discharge nozzles constitute an inverted v-shaped, the described lower port of these two discharge nozzles is fixed on the end wall of feeding funnel, the line of two lower port is positioned on the diameter of described feeding funnel or is positioned near zone diameter, correspondingly, a paddle is radially fixed on the top of the spiral shaft in the described feeding funnel, the outer end of this paddle be located at the discharge nozzle on this minute hopper lower port below.Radially also with on the direction of the parallel sidewalls of feeding funnel be provided with an oar in the outer end of paddle at this.By the agitator of this structure, in conjunction with dividing hopper, it is stable, continuous to guarantee that cobalt powder is carried.Under the situation of not establishing the branch hopper, also described radially paddle can be set on shaft.
The method of energy-saving and environment-protecting type for producing cobalt sheet provided by the invention is made the cobalt sheet with cobalt powder by compressing tablet and sintering process, do not pollute in the production, energy consumption is compared with existing electrolysis producing cobalt plate technology greatly and is reduced, further, the present invention to the special design of operation on each link and operating parameter, makes its performance of cobalt sheet of being made by method of the present invention to compare favourably with the cobalt sheet of electrolysis legal system in each operation.Cooperate above-mentioned technology, equipment provided by the invention can make this technology be able to better realization.
Description of drawings
The invention will be further described below in conjunction with accompanying drawing.
Fig. 1 prepares the structural representation of compressing tablet usefulness powder rolls in the equipment for cobalt sheet provided by the invention;
Fig. 2 is the right TV structure schematic diagram of Fig. 1;
Fig. 3 is feeding funnel in the powder rolls and the structural representation that divides hopper;
Fig. 4 is the surface structure schematic diagram (agitating device wherein omits) of device shown in Figure 3;
Fig. 5 prepares the structural representation of reduction sintering furnace in the equipment for cobalt sheet provided by the invention.
The specific embodiment
Embodiment 1:
The method of energy-saving and environment-protecting type for producing cobalt sheet provided by the invention, wherein employed raw material be cobalt content at the cobalt powder more than 99.3%, this method comprises compressing tablet and reduction sintering two operations, described cobalt powder is made the cobalt sheet by described compressing tablet and reduction sintering circuit.
The employed cobalt powder raw material of this method obtains by hydrolysis and reduction calcine technology, for example, uses CoCl
2Or CoSO
4Make presoma CoCO by hydrolysis
3Or CoC
2O
4, again this presoma is reduced calcining, can obtain cobalt powder.
The present invention is divided into low temperature presintering knot stage and high temperature sintering stage with described reduction sintering circuit, and the heating-up temperature to cobalt sheet pressed compact in the described low temperature presintering knot stage is 200-500 ℃, and be 0.1-5 hour heat time heating time; Described high temperature sintering in the stage heating-up temperature to cobalt sheet pressed compact be 500-900 ℃, be 1-10 hour heat time heating time.
The thickness of the pressed compact that extrudes in the compressing tablet process is the 0.8-3.0 millimeter, and the density of pressed compact is 3-6g/cm
3Employed cobalt powder in this method, its particle diameter is at 0.5-100 μ m.Cobalt powder is to use CoCl
2Or CoSO
4Make presoma CoCO by the chemical precipitation reaction
3Or CoC
2O
4, again this presoma is reduced that calcining obtains, its contain the cobalt amount 99.3-99.9% or more than
In the described reduction sintering process, in reduction furnace, feed reducibility gas, make the cobalt sheet that is sintered place reducing atmosphere.It can be a hydrogen, the also mist that can form by hydrogen and nitrogen, and the volume ratio of this hydrogen and nitrogen is 1:3 (or disassociation ammonia).It can also be CO gas.
Match with above-mentioned technology, the equipment of energy-saving and environment-protecting type for producing cobalt sheet provided by the invention comprises tablet press machine 1 and reduction furnace 2.
Shown in Fig. 1-4, tablet press machine 1 is powder rolls, it comprises frame 10, on this frame 10, be horizontally disposed with a pair roller 14, be provided with a gap therebetween, be provided with transmission device between these two rolls, one of them active roll is connected with driven speed regulating, these are prior art all, do not give unnecessary details at this.On the following methods, rack of roll, be provided with discharge port plate 12 (seeing Fig. 1,2).
Be provided with cobalt powder feeding funnel 11 on this frame 10, as shown in Figure 3, the top in gap between the described roll is located in its underpart outlet 110; In this feeding funnel 11, be provided with spiral shaft 111, fix on the horizontal support plate 112 that on this feeding funnel upper port, sets firmly, connect drive motors 113 in the upper end of this shaft;
In described sheeting process, described cobalt powder vertically by the rolling formation cobalt of the horizontal clearance sheet pressed compact between the roll 14 of powder rolls 1, is implemented in the feeding zone front by shaft cobalt powder is applied stirring, to increase its flowability.
On feeding funnel 11, add branch hopper 13, its below is provided with 2 discharging openings, connect a discharge nozzle 131 on it respectively, these two discharge nozzles constitute an inverted v-shaped, the described lower port of these two discharge nozzles is fixed on the end wall of feeding funnel, the line of two lower port is positioned on the diameter of described feeding funnel or is positioned near zone diameter, correspondingly, a paddle 111a is radially fixed on the top of the screw shaft 111 in the feeding funnel 11, the outer end of this paddle be located at the discharge nozzle on this minute hopper lower port below.Radially also with on the direction of the parallel sidewalls of feeding funnel be provided with an oar 111b in the outer end of paddle at this.By the agitator of this structure, in conjunction with dividing hopper, it is stable, continuous to guarantee that cobalt powder is carried.
As shown in Figure 5, reduction furnace 2 pushes away boat for multisection type, it comprises low-temperature sintering chamber 21, high temperature sintering chamber 22 and cooling chamber 23, each chamber links together by tube connector, in pushing away boat, form a tubular conduit that is communicated with each chamber, in this tubular conduit, be provided with several material boats 24 each other in contact, be provided with the material boat propulsion plant that the material boat can be pushed in the described tubular conduit in the import department that pushes away boat, it is an electric pushrod 25, in described heater and temperature detection and the adjusting device (not shown) of in each sintering chamber, being provided with, provide required temperature in order to give each chamber; In sintering chamber 21,22, also be provided with one or more reducing gas air inlets and exhaust outlet; Be provided with cooling device in the cooling chamber 23, it is the jacket type cooling device, is provided with cooling water inlet and outlet on chuck.In addition, also be provided with air inlet and exhaust outlet in the cooling chamber, be used for feeding as required the gas of protectiveness or other effect in cooling procedure.
Embodiment 2:
In the present embodiment, the thickness of the pressed compact that extrudes in the compressing tablet process is the 0.9-2.0 millimeter, and the density of pressed compact is 4-5g/cm
3Employed cobalt powder in this method, its particle diameter is at 1-2.0 μ m.
Heating-up temperature to cobalt sheet pressed compact in the described low temperature presintering knot stage is 500 ℃, and be 2.5 hours heat time heating time; Preferably can make oxygen content minimum reduction by 90% on original level in the cobalt sheet that enters the high temperature sintering stage heat time heating time in this low temperature presintering knot stage.Described high temperature sintering in the stage heating-up temperature to cobalt sheet pressed compact be 800 ℃, be 5 hours heat time heating time.
Other content is substantially the same manner as Example 1.
Embodiment 3:
In the present embodiment, the thickness of the pressed compact that extrudes in the compressing tablet process is 1.0 millimeters, and the density of pressed compact is 3-4g/cm
3。Employed cobalt powder in this method, its particle diameter is at 1-3.0 μ m.
Heating-up temperature to cobalt sheet pressed compact in the described low temperature presintering knot stage is 500 ℃, and be 1 hour heat time heating time; Described high temperature sintering in the stage heating-up temperature to cobalt sheet pressed compact be 750 ℃, be 8 hours heat time heating time.
Other content is substantially the same manner as Example 1.
Embodiment 4:
Heating-up temperature to cobalt sheet pressed compact in the described low temperature presintering knot stage is 500 ℃, and be 1 hour heat time heating time; Described high temperature sintering in the stage heating-up temperature to cobalt sheet pressed compact be 900 ℃, be 3 hours heat time heating time.
Other content is substantially the same manner as Example 1.
Embodiment 5:
In the present embodiment, the thickness of the pressed compact that extrudes in the compressing tablet process is 0.8 millimeter, and the density of pressed compact is 6g/cm
3。Employed cobalt powder in this method, its particle diameter is at 1-3.0 μ m.
Heating-up temperature to cobalt sheet pressed compact in the described low temperature presintering knot stage is 450 ℃, and be 0.2 hour heat time heating time; Described high temperature sintering in the stage heating-up temperature to cobalt sheet pressed compact be 750 ℃, be 8 hours heat time heating time.
Other content is substantially the same manner as Example 1.
Embodiment 6:
In the present embodiment, the thickness of the pressed compact that extrudes in the compressing tablet process is 0.8 millimeter, and the density of pressed compact is 6g/cm
3。Employed cobalt powder in this method, its particle diameter is at 50 μ m.
Heating-up temperature to cobalt sheet pressed compact in the described low temperature presintering knot stage is 500 ℃, and be 0.1 hour heat time heating time; Described high temperature sintering in the stage heating-up temperature to cobalt sheet pressed compact be 700 ℃, be 9 hours heat time heating time.
Other content is substantially the same manner as Example 1.
Embodiment 7:
In the present embodiment, the thickness of the pressed compact that extrudes in the compressing tablet process is 1.0 millimeters, and the density of pressed compact is 6g/cm
3。Employed cobalt powder in this method, its particle diameter is at 70 μ m.
Heating-up temperature to cobalt sheet pressed compact in the described low temperature presintering knot stage is 500 ℃, and be 0.2 hour heat time heating time; Described high temperature sintering in the stage heating-up temperature to cobalt sheet pressed compact be 800 ℃, be 7 hours heat time heating time.
Other content is substantially the same manner as Example 1.
Embodiment 8:
In the present embodiment, the thickness of the pressed compact that extrudes in the compressing tablet process is 3.0 millimeters, and the density of pressed compact is 5g/cm
3。Employed cobalt powder in this method, its particle diameter is at 100 μ m.
Heating-up temperature to cobalt sheet pressed compact in the described low temperature presintering knot stage is 500 ℃, and be 3 hours heat time heating time; Described high temperature sintering in the stage heating-up temperature to cobalt sheet pressed compact be 600 ℃, be 8 hours heat time heating time.
Other content is substantially the same manner as Example 1.
Claims (9)
1, a kind of method of energy-saving and environment-protecting type for producing cobalt sheet is characterized in that, comprises the reduction sintering circuit that cobalt powder is pressed into the sheeting process of cobalt sheet pressed compact and the reduction of this cobalt sheet pressed compact is sintered into the cobalt flake products; Wherein, in described sheeting process, described cobalt powder vertically is rolled by the horizontal clearance between the roll of powder rolls and forms cobalt sheet pressed compact.
2, the method for energy-saving and environment-protecting type for producing cobalt sheet according to claim 1, it is characterized in that, described reduction sintering circuit is divided into low temperature presintering knot stage and high temperature sintering stage, heating-up temperature to cobalt sheet pressed compact in the described low temperature presintering knot stage is 200-500 ℃, and be 0.1-5 hour heat time heating time; Described high temperature sintering in the stage heating-up temperature to cobalt sheet pressed compact be 500-900 ℃, be 1-10 hour heat time heating time.
3, the method for energy-saving and environment-protecting type for producing cobalt sheet according to claim 1, it is characterized in that, described reduction sintering circuit is divided into low temperature presintering knot stage and high temperature sintering stage, and the heat time heating time in this low temperature presintering knot stage is can make the oxygen content minimum reduction by 70% on original level in the cobalt sheet that enters the high temperature sintering stage be as the criterion.
4, the method for energy-saving and environment-protecting type for producing cobalt sheet according to claim 2 is characterized in that, the heat time heating time in this low temperature presintering knot stage is can make the oxygen content minimum reduction by 70% on original level in the cobalt sheet that enters the high temperature sintering stage be as the criterion.
5, the method for energy-saving and environment-protecting type for producing cobalt sheet according to claim 1 and 2 is characterized in that, the thickness of the pressed compact that extrudes in described sheeting process is the 0.8-3.0 millimeter, and the density of pressed compact is 3-6g/cm
3
6, the method for energy-saving and environment-protecting type for producing cobalt sheet according to claim 1 and 2 is characterized in that, employed cobalt powder, and its particle diameter is at 0.5-100 μ m; The cobalt amount that contains in the cobalt powder is more than 99.3%.
7, the method for energy-saving and environment-protecting type for producing cobalt sheet according to claim 1 and 2 is characterized in that, in the described reduction sintering circuit, feeds reducibility gas in reduction furnace, makes the cobalt sheet that is sintered place reducing atmosphere; The reducibility gas that feeds is a hydrogen; Or the mist of forming by hydrogen and nitrogen, the volume ratio of this hydrogen and nitrogen is 1:3; Or be the disassociation ammonia; Or CO gas.
8, a kind of equipment of energy-saving and environment-protecting type for producing cobalt sheet, it is characterized in that, comprise tablet press machine, described tablet press machine is powder rolls, it comprises frame, is horizontally disposed with a pair roller on this frame, is provided with a gap therebetween, be provided with the cobalt powder feeding funnel on this frame, the top in gap between the described roll is located in its underpart outlet; In this feeding funnel, be provided with the screw shaft, fix on this feeding funnel; On described feeding funnel, add the branch hopper, its below is provided with 2 discharging openings, connect a discharge nozzle on it respectively, these two discharge nozzles constitute an inverted v-shaped, the lower port of these two discharge nozzles is fixed on the end wall of feeding funnel, and the line of two described lower port is positioned on the diameter of described feeding funnel or is positioned near zone diameter;
The said equipment also comprises reduction furnace, described reduction furnace is that multisection type pushes away boat, it comprises the low-temperature sintering chamber, high temperature sintering chamber and cooling chamber, each chamber links together by tube connector, forming one in pushing away boat can be by the tubular conduit of each chamber, in this tubular conduit, be provided with several material boats each other in contact, be provided with the material boat propulsion plant that the material boat can be pushed in the described tubular conduit in the import department that pushes away boat, in described each sintering chamber, be provided with heater and temperature detection and adjusting device, provide required temperature in order to give each chamber; In described each sintering chamber, be provided with one or more reducing gas air inlets and exhaust outlet, in described cooling chamber, be provided with air inlet and exhaust outlet; Be provided with cooling device in the described cooling chamber; A paddle is radially fixed on the top of the spiral shaft in the described feeding funnel, the outer end of this paddle be located at the discharge nozzle on this minute hopper lower port below.
9, the equipment of energy-saving and environment-protecting type for producing cobalt sheet according to claim 8 is characterized in that, radially also with on the direction of the parallel sidewalls of feeding funnel is provided with an oar in the outer end of paddle at this.
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| CN103157793A (en) * | 2011-12-14 | 2013-06-19 | 北京航空航天大学 | Metastable-state face-centered cubic phase block cobalt metal and preparation method thereof |
| CN108772560B (en) * | 2018-07-05 | 2020-06-16 | 温州澳鼎建材有限公司 | Convenient feeding device for metallurgical powder |
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| CN1743101A (en) | 2006-03-08 |
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