CN104402457B - Preparation method of ceramic powder - Google Patents
Preparation method of ceramic powder Download PDFInfo
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- CN104402457B CN104402457B CN201410693244.2A CN201410693244A CN104402457B CN 104402457 B CN104402457 B CN 104402457B CN 201410693244 A CN201410693244 A CN 201410693244A CN 104402457 B CN104402457 B CN 104402457B
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Abstract
The invention discloses a preparation method of ceramic powder. The preparation method of ceramic powder comprises the following steps: grinding a hard raw material into powder and carrying out magnetic separation to prepare hard powder; slurrying and screening soft raw material and carrying out magnetic separation to prepare soft slurry; spraying, mixing and granulating the processed hard powder and soft slurry; optimizing particle sizes. According to the preparation method, the hard raw material and the soft raw material are processed separately; only the hard raw material is ground into powder in the powder grinding process;, so that the crushing frequency and crushing devices are reduced, and the powder grinding efficiency is improved; the soft raw material is slurried and screened, and then mixed with the hard powder, and the subsequent steps are performed, so that the step of drying the raw materials is eliminated; excessive water is not required to be added for mixing the slurry in the spraying and granulating process, so that the water is saved, and the heat energy consumed by evaporating excessive water is reduced.
Description
Technical field
The present invention relates to ceramic processing technique field, and in particular to a kind of preparation method of ceramic powder.
Background technology
Ceramic material is through shaping and a class inorganic non-metallic material made by high temperature sintering with naturally occurring or synthetic compound
Material.It has the advantages that high-melting-point, high rigidity, high-wearing feature, resistance to oxidation.Ceramic powder is exactly ceramics used when preparing ceramics
The granular material that the various ways such as raw material Jing is broken, grinding, mixing are formed.Hard powder and soft is included in ceramic material
Powder, the hardness of hard material is big.
The main grinding of preparation method of existing ceramic powder, except ferrum, homogenizing, be spray-dried the operations such as powder processed.Current
Preparation method is primarily present following defect：1. hard raw material is crushed together with soft raw material in broken process, crushing efficiency
It is low；2. the powder particles level after granulating working procedure is matched somebody with somebody and is difficult to control, it is difficult to ensure the quality of pelletize, it is impossible to adapt to wanting for green brick forming
Ask；3. water content, 30% or so, is needed to soft material with the effect for during hard material fine grinding, being guarantee fine grinding in soft material
Material is dried, and causes step complicated, high energy consumption；4th, need to add the moisture considerably beyond requirement in preparation process, so
Afterwards in order to technique needs re-dry excess moisture, energy significant wastage is caused.
The content of the invention
To overcome the defect of prior art, it is an object of the invention to provide a kind of preparation method of ceramic powder, is reduced
Broken number of times and equipment, improve the efficiency and quality of grinding.
For achieving the above object the technical solution adopted in the present invention is as follows：
A kind of preparation method of ceramic powder, it includes
The step of hard raw material grinding, magnetic separation process are prepared into hard powder；With
Soft raw material slurrying is sieved, magnetic separation processes the step of preparing soft slurry；With
The step of by the hard powder after process and soft slurry spraying mixing granulation；And
The step of grade optimizes.
In preferred scheme, the preparation method of the ceramic powder is additionally included in after grade optimization to powder using vibration
The step of fluid bed dryer is dried to powder.
Specifically, it is by hard raw material grinding the step of hard material grinding, magnetic separation are processed in above-mentioned preparation method
Machine grinding is to 250 mesh～325 mesh again through magnetic separation.Preferably, the flour mill is high-pressure overhang roll formula flour mill.
Specifically, in above-mentioned preparation method, the slurrying of soft raw material is sieved, magnetic separation is that soft raw material is directly worn into slurry
And magnetic separation again after 250 mesh～325 mesh sieves excessively.
Specifically, in above-mentioned preparation method, the soft slurry moisture content after magnetic separation is 35%-50%.
Specifically, in above-mentioned preparation method, hard powder and soft slurry spraying mixing granulation the step of be soft slurry
Using pressure nozzle atomization and hard powder mixing granulation after merging.
In the present invention, by soft slurry and hard powder mixing granulation, bond can plurality of raw materials, improve mixed powder
The mobility of material, in granulation process, makes powder more uniform, smooth.Soft slurry and hard powder mixing granulation.
Find in the research process of the present invention, when the solid content of slurry is low, the water translocation of slurry is to droplet when being dried
Surface, and carrying solids makes granule be internally formed part hollow, and in droplet periphery the elastic film of hypotonicity is formed, by
Low in evaporation rate, droplet temperature is raised, and moisture makes droplet produce protuberance from internal evaporation, forms hollow bead, causes drying
It is not thorough.And highly filled slip can shorten dry run, dry run shorten can reduce with moisture to
The binder amount of grain surface migration, can so avoid the agglomerant concentration of particle surface from having granule more than center hard
Appearance, compressing middle granule it is indeformable, crushing, reduce green body quality；Therefore, in order to obtain high-quality dry powder, it is necessary to
The solid concentration of slip is improved, specifically, the solid content of hard powder and soft slurry merging disposed slurry is 50-70%.
Specifically, in above-mentioned preparation method, the step of grade optimizes in, by weight calculating, control 10～30 purposes
Grain accounts for the granule of 28%～35%, 31～50 mesh and accounts for the granule of 38%～48%, 51～70 mesh and accounts for 10%～18%, 71～90 mesh
Granule account for 5%～10%.In the present invention, dividing for grade is controlled by way of soft slurry and hard powder mixing granulation
Match somebody with somebody, the mobility of powder can be effectively improved, so as to be conducive to follow-up press-molding, improve the quality of product.
Compared to existing technology, the beneficial effects of the present invention is：
1. in the preparation method of the present invention, hard raw material and soft raw material are separately processed, only to hard in powder-grinding process
Matter raw material carries out grinding, reduces broken number of times and equipment, improves mill efficiency；And soft raw material is sieved place by slurrying
Reason, then merge with hard powder and carry out follow-up step, raw material drying step is eliminated, nothing during mist projection granulating can also be made
Need to add and be sized mixing with many water, save with water and reduced the heat energy that evaporation excessive moisture is consumed；
2. process is optimized to grade in the preparation method of the present invention, it is ensured that the quality of pelletize, improves whole pottery
The quality of ceramic powder.
The present invention is described in further detail with reference to specific embodiment.
Specific embodiment
Embodiment 1
A kind of preparation method of ceramic powder, it includes
1) the step of hard raw material grinding, magnetic separation process being prepared into hard powder：By hard raw material with hot air drying
The powder of high-pressure overhang roll formula flour mill grinding to 250 mesh, then through magnetic separation；
2) soft raw material slurrying is sieved, magnetic separation processes the step of preparing soft slurry：Soft raw material directly wears into slurry
And magnetic separation again after 250 mesh sieves is crossed, the soft slurry water content after magnetic separation is 35% (wt)；
3) by the hard powder and soft slurry mixed atomizing drying-granulating after process the step of：By step 2) hard powder
Expect through press atomization and step 1) hard powder mixing granulation, control the rotating speed 400r/min of powder dish and the pressure of mud
2MPa is adjusting grade；
4) the step of grade optimizes：By weight calculating, the granule for controlling 10～30 mesh accounts for the granule of 28%, 31～50 mesh
The granule for accounting for 48%, 51～70 mesh accounts for the granule of 14%, 71～90 mesh and accounts for 10%.
The apparent density of the ceramic powder of embodiment 1 is 0.95g/cm3。
Embodiment 2
A kind of preparation method of ceramic powder, it includes
1) the step of hard raw material grinding, magnetic separation process being prepared into hard powder：By hard raw material high-pressure overhang roll formula powder
The powder of grinding machine grinding to 325 mesh, then through magnetic separation；
2) soft raw material slurrying is sieved, magnetic separation processes the step of preparing soft slurry：Soft raw material directly wears into slurry
And magnetic separation again after 325 mesh sieves is crossed, the soft slurry water content after magnetic separation is 50% (wt)；
3) by the hard powder and soft slurry mixed atomizing drying-granulating after process the step of：By step 2) hard powder
Expect through press atomization and step 1) hard powder mixing granulation, control the rotating speed 800r/min of powder dish and the pressure of mud
1Mpa is adjusting grade；
4) the step of grade optimizes：By weight calculating, the granule for controlling 10～30 mesh accounts for the granule of 35%, 31～50 mesh
The granule for accounting for 38%, 51～70 mesh accounts for the granule of 18%, 71～90 mesh and accounts for 9%；
5) it is dried：Powder is dried using Vibratingfluidbeddrier to powder after grade optimization.
The apparent density of the ceramic powder of embodiment 1 is 1.1g/cm3。
In above-described embodiment 1 and embodiment 2 or on the basis of both schemes, the high-pressure overhang roll formula flour mill is heat
Dry high-pressure overhang roll formula flour mill is air-dried, the hot blast temperature of the high-pressure overhang roll formula flour mill with hot air drying is controlled at 30 ° -500 °
Between scalable；This high-pressure overhang roll formula grinding machine with hot air drying causes powder to be not easy caking during fine grinding, improves
Pulverizing efficiency；Furthermore, this high-pressure overhang roll formula grinding machine with hot air drying has dry and selecting crude drugs with winnower both sides function, can
Dry powder can carry out selecting crude drugs with winnower, it is ensured that only meet fineness requirement to powder again to improve pulverizing effect during fine grinding
Powder can just send grinding machine.
Magnetic separation includes carrying out hard powder except ferrum, to remove the ferrum for being mixed into powder because of mechanical wear in powder-grinding process
Impurity；Also include carrying out soft slurry except ferrum, to remove the iron tramp being mixed into because of mechanical wear during slurrying.
Above-mentioned embodiment is only the preferred embodiment of the present invention, it is impossible to limit the scope of protection of the invention with this,
The change and replacement of any unsubstantiality that those skilled in the art is done on the basis of the present invention belongs to institute of the present invention
Claimed scope.
Claims (7)
1. a kind of preparation method of ceramic powder, it is characterised in that it includes
The step of hard raw material grinding, magnetic separation process are prepared into hard powder；With
Soft raw material slurrying is sieved, magnetic separation processes the step of preparing soft slurry；With
The step of by the hard powder after process and soft slurry spraying mixing granulation；And
The step of grade optimizes；
In 3rd step, the solid content of hard powder and soft slurry mixing disposed slurry is 50-70%.
2. the preparation method of ceramic powder according to claim 1, it is characterised in that it is additionally included in after grade optimization
The step of powder is dried using Vibratingfluidbeddrier to powder.
3. the preparation method of ceramic powder according to claim 1, it is characterised in that at hard raw material grinding, magnetic separation
The step of reason is again through magnetic separation by hard raw material flour mill grinding to 250 mesh～325 mesh.
4. the preparation method of ceramic powder according to claim 1, it is characterised in that the slurrying of soft raw material is sieved, magnetic
Choosing is that soft raw material is directly worn into magnetic separation again after slurry and excessively 250 mesh～325 mesh sieves.
5. the preparation method of ceramic powder according to claim 4, it is characterised in that the soft slurry after magnetic separation contains
Water rate is 35%-50% (wt).
6. the preparation method of ceramic powder according to claim 1, it is characterised in that hard powder and soft slurry are sprayed
The step of mixing granulation is soft slurry using pressure nozzle atomization and hard powder mixing granulation.
7. the preparation method of ceramic powder according to claim 1, it is characterised in that in the step of grade optimizes, by weight
Than calculating, the granule for controlling 10～30 mesh accounts for the granule of 28%～35%, 31～50 mesh and accounts for 38%～48%, 51～70 purposes amount
Granule accounts for 10%～18%, and the granule of 71～90 mesh accounts for 5%～10%.
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| CN201410693244.2A CN104402457B (en) | 2014-11-25 | 2014-11-25 | Preparation method of ceramic powder |
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Denomination of invention: Preparation method of ceramic powder Effective date of registration: 20200225 Granted publication date: 20170412 Pledgee: Bank of China Limited by Share Ltd Foshan branch Pledgor: Guangdong Eding Industrial Co.,Ltd. Registration number: Y2020980000334 |
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