CN101121282B - Technology for preparing blank for constructive ceramic with semi-drying method - Google Patents
Technology for preparing blank for constructive ceramic with semi-drying method Download PDFInfo
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Abstract
The present invention relates to a technology for manufacturing the blank of architectural ceramics. The technology is a semi-dry one for manufacturing the blank of architectural ceramics; the technology is characterized in that the technology comprises the following steps: materials batching that materials are quantified according to regular production materials proportion of architectural ceramics and the materials is put into a ball grinder; wet ball grinding; the iron material is sifted out; the dry powder is manufactured: a part of the pulp manufactured through the process (3) is made into dry powder; spraying powder dry grain manufacturing: one share of the pulp made through the process (3) is sprayed into a spraying powder drier to form pulp fogdrop, i.e. wet core; 4 to 7.5 shares of dry powder are sprayed into the spraying powder drier made through the process (4) to form a dispersed distribution state; the wet core contacts and fully absorbs the dispersed dry powder to from grains of dry powder-pulp drop inclusion which is wet inside and dry outside; rolling and solidifying of the grains to form ball blank; vibrating and sifting out; water content is modulated and fossilized to form the blank used for architectural ceramics. The present invention boasts of low energy consumption, light pollution, material evenness and no iron pollution.
Description
Technical field
The present invention relates to a kind of technology for preparing blank for constructive ceramic.
Background technology
The typical process flow of architectural pottery production is: raw material prepares blank → compression moulding → green compact drying → burn till → ceramic product.(annotate, " blank " that prepared by raw material also often is called " powder ", comes down to by the attritive powder material by the low amounts of water branch in conjunction with the granularity that the constitutes powder particle between 0.2～0.8mm usually).In the compression moulding operation, need blank is filled in the mould cavity of brick machine, exert pressure again, under pressure, blank is pressed into ceramic green.When compression moulding, the air in the blank space must be discharged swimmingly, otherwise after the release, residual compressed air will make ceramic body lamination occur, become useless base.For effectively overcoming the lamination in the compression moulding process, usually blank is made as more regular form of spherical particles blank in advance, the flowability and the packed density of blank when improving the dress mould, and help air and discharge smoothly.As seen, the preparation quality of spherical ingot is the important factor in order of green compact Forming Quality and final ceramic product quality in the decision architectural pottery production process.The technology of preparation ceramic batch mainly contains two kinds at present, i.e. wet powder-making technology (or claiming spray drying granulation technology) and dry method flouring technology (or claiming the humidification prilling).
The typical process flow of wet powder-making technology is: the batching → wet ball grinding slurrying → deironing → spray drying granulation that sieves → old → spherical ingot.Specifically the technology implementation procedure is, drops into ball mill after the raw material weighing by a certain percentage, water mixing 33～38%, and wet ball grinding is worn into slurry; Slurry sieves, deironing is after hydraulic plunger is pumped into spray drying tower, adopt the high-temperature hot-air medium with the slurry droplet suddenly drying be moisture content at 5%～7% spherical ingot; Obtain to be suitable for the spherical ingot of compression moulding after old.Because the automaticity height of wet powder-making technology, and the slurry granularity that wet ball grinding obtains is tiny evenly, be easy to the deironing of sieving, functional by the spherical ingot of spray drying granulation preparation, can effectively ensure the green compact quality and the ceramic product quality of compression moulding.To the end of the eighties, the nearly all large and medium-sized pottery manufacturer that founds a capital of China has adopted wet powder-making technology to prepare spherical ingot.Yet wet powder-making technology also has the following disadvantages: (1) energy consumption height.Spray drying tower drips slurry as drying medium with 800～1000 ℃ the hot gas that fuel combustion was generated and carries out drying, and temperature is very high in the tower, and the tower body volume is too huge, and tower height is 7～16m usually, and diameter is 4.5～9m, causes the tower body heat loss amount huge; Spray-drying process must use high-temperature hot-air with slurry droplet evaporate to dryness suddenly, so the tail gas of temperature between 60～130 ℃ is difficult to be recycled to Ta Nei and is recovered utilization in addition.All of these factors taken together causes the operation energy consumption of spray drying tower too high, and in the architectural pottery that uses atomizing granulating technology was produced, the energy consumption of spray drying tower accounted for architectural pottery and produces about 50～60% of total energy consumption; (2) tail gas pollution is serious, and the spray-drying medium is the high-temperature hot-air that fuel combustion produces, and contains atmosphere pollutions such as SOx, NOx that fuel combustion produces and dust; In addition, water content is that moisture content is 5～7% spherical ingot in slurry evaporation drying under the hot blast effect of 33～38%, must discharge a large amount of water vapours; Slurry also can produce a large amount of dust at the later stage of drying.Therefore, the tail gas of discharging from spray drying tower is the comprehensive waste gas of multiple atmosphere pollution matter such as a kind of SOx of containing, NOx, water vapour, fuel combustion dust, ceramic powder dust, and purified treatment is difficult unusually.Particularly a large amount of water vapours makes electrostatic precipitation, bag type dust removing technology be difficult to use, although and use wet dedusting desulfurization denitrification integral technology can effectively purify tail gas, but tail gas temperature after wet cleaning can reduce, air pressure descends, be difficult to discharge voluntarily, need acquire high-power air inducing equipment, thereby increase the cleaning equipment operating cost.In addition, tail gas clean-up also can produce waste water, also need carry out harmless treatment.Therefore, in the architectural pottery that adopts atomizing granulating technology was produced, spray drying granulation workshop section had become whole architectural pottery production line and has polluted the most serious workshop section.
The typical process flow of dry method flouring technology is: batching → dry method fine grinding → sieve → humidification granulation → drying → screening → old → spherical ingot.Concrete operation is: various raw materials are crushed to the fine grinding of preparing burden behind the certain particle size separately; Sieve; oversize returns the fine grinding operation again; the wet granular powder excessively of moisture content about 10%～12% is made in the minus mesh that meets granularity requirements through the humidification comminutor; again behind drying and the vibrosieve; oversize enters vibratory sieve once more after little fragmentation; minus mesh deliver to feed bin old after, promptly obtain the spherical ingot that compression moulding is used.The dry method flouring technology is used more relatively abroad.The dry method flouring technology is compared with wet powder-making technology, has following advantage: (1) energy efficient.Wet powder-making technology needs the slurry of moisture content 33～38% evaporation drying suddenly, obtains water content and be 5%～7% spherical ingot; And the dry method flouring technology only the humidification powder of moisture content 10%～12% to be dried to water content be 5%～7% spherical ingot, obviously the dry method flouring technology is than wet powder-making technology energy savings; (2) tail gas pollution is lighter.As mentioned above, in the wet powder-making technology, spray-drying process will give off a large amount of comprehensive tail gas that is rich in pollutants such as water vapour, dust, SOx, NOx, be difficult to purified treatment; And the dry method flouring technology does not almost produce the processing step of serious environmental pollution.Yet the dry method flouring technology also has the following disadvantages: (1) powder material is even inadequately.In wet powder-making, various stock yards by the wet ball grinding hybrid mode, can reach very high mixture homogeneity by aqueous medium, and the material uniformity of slurry and even final powder is preferable; And in dry method powder process, it is mixed that each raw material relies on the mechanical mixture effect fully, and each stock yard degree of mixing is relatively poor, and the powder material is even inadequately; (2) powder screening difficulty, the powder fineness is relatively poor.Wet powder-making process using ball mill wet ball grinding prepares slurry, and the slurry water content has very big pressure and flowability at 33～38%, is easy to sieve sub-elect coarse particulate matter, obtains the uniform slurry of fineness; And in the dry method flouring technology, the raw material dry powder of acquisition screening difficulty, very difficult sieving separating goes out coarseparticulate, and the powder fineness is difficult to be protected; (3) dry grinding efficient is low, the iron removal by magnetic separation difficulty.The ball-milling medium that wet ball grinding adopts is generally inorganic material, and the batch ball milling is tailed over below 2% to 10000-hole sieve (250 order), does not bring irony into, can not produce base substrate and glaze and endanger, and slurry is easy to by iron removal by magnetic separation, so product quality is secure; And in dry method powder process, dry grinding equipment Raymond mill is if will dry grind raw material to the fineness same with wet ball grinding, then mill output is low, energy consumption is big, and can in powder, be grinding into irony, dry powder deironing efficient is extremely low in addition, finally cause product whiteness relatively poor, even the iron fault occurs, influenced product quality; (4) to raw material quality requirement height.Remove because the raw material impurity in the dry method flouring technology is difficult, purer raw material is selected in general requirement for use, and requires prescription simple, raw material hardness unanimity, and raw material moisture can not be too high, causes this method to be restricted in production application.
Summary of the invention
Exist energy consumption height, tail gas pollution serious at active service wet powder-making technology, there is the deficiency that expecting property uniformity is relatively poor, be subject to the irony pollution in the dry method flouring technology, the object of the present invention is to provide the technology of the preparing blank for constructive ceramic with semi-drying method of a kind of low energy consumption, light pollution, even, the no irony pollution of material property.
To achieve these goals, technical scheme of the present invention is: a kind of technology of preparing blank for constructive ceramic with semi-drying method is characterized in that it may further comprise the steps:
(1) batching: each raw material of architectural pottery raw materials for production proportioning weighing routinely, put in the ball mill;
(2) wet ball grinding: adopt conventional wet ball grinding technology with raw material fine grinding form slurry in ball mill, the slurry moisture content is 33～38% (quality), and granularity is that 10000-hole sieve tails over less than 2% (quality);
(3) deironing is sieved: slurry by the iron tramp in the magnetic separator removal slurry, by 140 mesh sieves, is sifted out coarseparticulate again, flow into slurry pool, store standby as slurry;
(4) dry powder preparation: a part of slurry that step (3) is made dewaters and the drier drying by filter press, make the dried feed cake of moisture content, by beating powder equipment, make granularity again less than 100 purpose dry powder less than 1% (quality), be transferred to the dry powder feed bin, store standby as dry powder;
(5) spraying dried bean noodles granulation: the slurry of 1 part of quality that step (3) is made sprays into spraying dried bean noodles device, forms the slurry droplet, promptly wet nuclear; The dry powder of 4～7.5 parts of quality that step (4) is made sprays into spraying dried bean noodles device, forms the disperse distribution; Wet nuclear contact with the dry powder of disperse attitude, and in dropping process abundant absorption dry powder, the granular dry powder-slurry that generates wet inside and dry outside drips inclusion enclave, the aggregate bin bottom spraying dried bean noodles device of sinking, old 2～5h is beneficial to inside and starches the branch that drips and spread to outside dry powder;
(6) round as a ball and compacting: with dry powder-slurry drip an inclusion enclave spew out into cylinder by gravity or will or dry powder-slurry drip an inclusion enclave and spew out into rotating disk by centrifugal force, dry powder-slurry inclusion enclave is round as a ball and tamp, make spherical ingot;
(7) vibrosieve: spherical ingot by vibratory sieve, is filtered out the spherical ingot of granularity between 0.1～1mm, and triage returns step (4) and is prepared into dry powder again;
(8) moisture is regulated: use drier, the spherical ingot of granularity between 0.1～1mm that step (7) is filtered out dry to the moisture mass content be 5～7%;
(9) old: with the moisture mass content is that 5～7% spherical ingot is transferred to feed bin, more than the old 48h, obtains to be applicable to the blank for constructive ceramic finished product of compression moulding.
Typical process flow of the present invention is seen Fig. 1.
The basic meaning of step (5) described " granulation of spraying dried bean noodles " is, utilize the slurry parcel of dry dry powder with spray form, under the moisture diffusion effect, dry and outer dry powder is made granular dry powder-slurry inclusion enclave by fractional wettability to inner slurry droplet by part; Described " dry powder-slurry drips inclusion enclave " means that the inner slurry slurry that gets for spraying drips, and the outside is that slurry drips adsorbed dry powder, forms the agglomerated particle attitude structure that dry powder parcel slurry drips.
Step (5) described " spraying dried bean noodles device " is that a kind of dry powder parcel spraying slurry that utilizes drips to realize the equipment of drying, granulating purpose.The basic structure of spraying dried bean noodles device is: at airtight cylinder top one slurry nozzle is set, with the slurry atomisation; At the cylinder sidepiece one dry powder spout is set, utilizes high speed winds that dry powder is sprayed into cylinder interior, make dry powder form the disperse shape; Be arranged to the hopper shape in the cylinder bottom, granular dry powder-slurry inclusion enclave of from top to bottom landing is collected.
In step (5), the ratio that sprays into of slurry and dry powder needs to determine according to slurry moisture content, the dry powder moisture content of reality.
The necessity that step (8) moisture is regulated is, because the slurry slurry drips limited to the adsorption capacity of dry powder, inevitable some dry powder can not be dripped adsorbed by slurry and be free in outside dry powder-slurry inclusion enclave, according to practical production experience, in certain adsorption time (being in the operating process time period of step (5)), by moisture is that 33～38% spraying slurry drips the moisture of a dry powder-slurry inclusion enclave that is generated behind the abundant absorption dry powder usually between 9～12%, therefore, after sifting out, the dry powder that will not be adsorbed by step (7) vibrosieve drips inclusion enclave through round as a ball by dry powder-slurry, the actual moisture content of the spherical ingot that compacting makes is usually 9～12%, so need the actual moisture of blank to be regulated and control between 5～7%, to adapt to the moisture requirement of compression moulding by the drying process of step (8).
The basic principle of semidry method flouring technology of the present invention is: adopt the wet ball grinding mode to make the slurry that material property is even, particle is trickle, no irony is polluted; The slurry separated into two parts, a part of slurry through dehydration, dry, beat powder equipment, make dry powder, sprayed into spraying dried bean noodles device, form the disperse distribution, another part slurry is directly sprayed into spraying dried bean noodles device, forms the slurry droplet, promptly wet examining; Wet nuclear contacts with the dry powder of disperse attitude, and fully adsorbs dry powder in ejection and dropping process, and the granular dry powder-slurry that generates wet inside and dry outside drips inclusion enclave; In dry powder-slurry dripped inclusion enclave, the effect by capillary force made the moisture in the inner slurry droplet spread to outer dry powder, cause inner slurry droplet by the part drying and outer dry powder by fractional wettability, interior free surface moisture reaches unanimity gradually; Again dry powder-slurry is dripped inclusion enclave and spewed out into cylinder or rotating disk,, dry powder-slurry is dripped the round as a ball and compacting of inclusion enclave, make spherical ingot by gravity or centrifugal force; Through vibrosieve, sub-elect the blank of granularity between 0.1～1mm, and utilize drier again, its moisture oven dry is regulated and control at 5～7%; Change feed bin over to, more than the old 48h, obtain to be applicable to the blank for constructive ceramic finished product of compression moulding.
The present invention compares with active service wet powder-making technology, the shaping principle of the drying of slurry, spherical ingot and the differences such as preparation technology's flow process that adopted, the wherein fundamental difference that is not both the present invention and active service wet powder-making technology of the shaping principle of slurry drying and spherical ingot.Concrete difference is as follows:
(1) drying mode of slurry difference and corresponding energy consumption are different with the environmental pollution degree.The present invention with a part of slurry by dehydration equipment, drying equipment dewater, drying, can effectively reduce the energy consumption for drying of Unit Weight moisture, and, can not produce air environmental pollution because drying source can use the hot-air of cleaning; And the drying mode of active service wet powder-making process using is a spray-drying, in spray drying tower, directly utilize high-temperature hot-air that fuel combustion generates with slurry droplet evaporate to dryness suddenly, the energy consumption for drying of Unit Weight moisture is the highest in all drying modes, simultaneously, spray drying tower institute discharge tail gas is that a kind of SOx of containing (is mainly SO
2), NOx (is mainly NO
2), the comprehensive waste gas of multiple atmosphere pollution matter such as water vapour, fuel combustion dust, blank dust, make the purified treatment of tail gas difficult unusually, control expense is quite high;
(2) the shaping principle difference of spherical ingot.The present invention utilizes the slurry droplet parcel of the dry powder of disperse shape with atomizing in spraying dried bean noodles device, dry powder-the slurry that generates wet inside and dry outside drips inclusion enclave, and the moisture in the inner slurry droplet is spread to outer dry powder by the effect of capillary force, cause inner slurry droplet by part dry and outer dry powder by fractional wettability, interior free surface moisture reaches unanimity gradually, then by round as a ball, compacting, screening, drying, make spherical ingot; And active service wet powder-making technology is to adopt the mode of spray drying granulation, utilizes high-temperature hot-air that the slurry droplet is heated suddenly in spray drying tower, and evaporative removal part moisture obtains moisture at 5～7% spherical ingot;
(3) difference of technological process.The present invention makes the material cake with the part of wet ball grinding gained slurry by dehydration, drying process, the economy-combat powder equipment is made dry powder again, spray into spraying dried bean noodles device, and another part slurry directly sprays into spraying dried bean noodles device, utilize dry powder that the slurry droplet is wrapped up, dry powder-the slurry that generates wet inside and dry outside drips inclusion enclave, by round as a ball, compacting, makes spherical ingot then; And active service wet powder-making technology is that whole slurries are directly sprayed into spray drying tower, carries out spray drying granulation, makes spherical ingot.
The present invention compares with active service dry method flouring technology, the fine grinding of raw material, granulation mechanism and the preparation technology's flow process difference that is adopted, the fundamental difference that is not both the present invention and active service dry method flouring technology of wherein granulation mechanism.Concrete difference is as follows:
(1) difference of raw material fine grinding mode.The present invention adopts wet ball grinding equipment that batch is carried out fine grinding, the grinding efficiency height, and no irony is polluted, and the mixing of various raw material is fully, and the batch material is even, and slurry fluidity is good, is easy to the deironing of sieving; And active service dry method flouring technology is to adopt dry grinding equipment that batch is carried out fine grinding, and grinding efficiency is low, cause that easily irony pollutes, and the batch material uniformity is relatively poor, the dry powder very difficulty of deironing of sieving, and irony is difficult to remove.
The difference of (2) granulation mechanism.The present invention sprays into spraying dried bean noodles device respectively with slurry and dry powder, the slurry droplet of ejection is wet nuclear, can be considered to the great blank particle of the uniform humidity of moisture distribution in essence, wet nuclear adsorbs the dry powder of disperse attitude again, and is wrapped up by dry powder, relend help capillary force between wet nuclear and dry powder after moisture diffusion, begin to take shape the blank particle, after round as a ball, compacting, screening, can obtain spherical ingot, the granulation efficiency height again; And active service dry method flouring technology is that pure water and dry powder are sprayed into the humidification comminutor respectively; wet nuclear is to be generated by pure water absorption dry powder; certainly will cause the slow and moisture distribution inequality of moisture diffusion; thereby the growing up of wet nuclear, the formation of blank particle, the regularity of blank particle have been influenced; also strengthen the workload of follow-up round as a ball operation, and then influenced the formation efficiency and the final mass of spherical ingot.
(3) difference of technological process.The present invention uses " slurry-spraying pelletizing ",, adopts wet ball grinding slurrying that is, and spraying dried bean noodles mode is adopted in the dry powder process of high-efficiency dehydration then, generates a blank material by the dry powder parcel spraying slurry mode of dripping; And active service dry method flouring technology is used " water spray granulation ",, adopts raw material dry grinding powder process that is, adopts humidification granulation mode then, by spraying water the wetting granulating of dry powder.
Compare with the wet powder-making technology of active service, beneficial effect of the present invention is as follows:
(1) energy efficient.As mentioned above, the mummification device integration system that the present invention adopts filter press and drier to constitute carries out drying to a part of slurry, is prepared into dry powder.Because different mummification equipment carry out dry efficient difference to the different material of water content,, can reduce dry hear rate significantly so adopt multiple mummification equipment that slurry is carried out the classification continuous drying from the high-moisture to the low moisture; And another part slurry is directly used in the spraying pulping and drips, and again by dry powder parcel, dry, granulating, this drying-granulating process does not need new hear rate.Therefore, the powder process total energy consumption of semidry method flouring technology of the present invention is lower.By contrast, it is 5～7% spherical ingot that active service wet powder-making process using spray drying tower all is dried to moisture content with slurry, because spray drying tower belongs to fast dried equipment, tower body is huge, the thermal losses height, waste heat is difficult to recycle and reuse, so the spray-drying great a kind of drying mode that is energy consumption, the energy consumption of corresponding wet powder-making technology is very high.
(2) atmosphere pollution is little, and is easy to control.In half-dried legal system technology of the present invention, the drying of a part of slurry is the mummification device integration system that adopts filter press and drier to constitute, and utilizes the hot-air of mechanical force and cleaning to come slurry is carried out drying, so dry run can not produce pollution.Although also can produce atmosphere pollution for drier provides the fuel combustion of thermal source, but fuel combustion tail gas is the same with plain cylindrical furnace or kiln tail gas, waste gas for drying, purified treatment is relatively easy, and discharge capacity is also much smaller than spray drying tower, so the present invention has the little advantage of atmosphere pollution with respect to wet powder-making technology.By contrast, in wet powder-making technology, spray drying tower carries out spray drying granulation with the hot gas that fuel combustion was generated as drying medium.Obviously, contain atmosphere pollutions such as SOx, NOx and dust in the fuel combustion tail gas.Slurry during evaporation drying, then can generate a large amount of water vapours and powder dust under the hot blast effect.As seen, the tail gas of discharging from spray drying tower is the comprehensive waste gas of multiple atmosphere pollution matter such as a kind of SOx of containing, NOx, water vapour, fuel combustion dust, ceramic powder dust, makes the purified treatment of tail gas difficult unusually.Particularly a large amount of water vapours makes efficiently, and electrostatic precipitation, bag type dust removing technology are difficult to use, although and use wet dedusting desulfurization denitration technology can effectively purify tail gas, tail gas temperature after wet cleaning can reduce, and air pressure descends, be difficult to discharge voluntarily, need acquire high-power air inducing equipment.In addition, the tail gas clean-up waste water of generation also takes capable harmless treatment.This shows that the atmosphere pollution of the wet powder-making technology of active service is serious, the control difficulty is big.
Compare with the dry method flouring technology of active service, beneficial effect of the present invention is as follows:
(1) efficient height in small, broken bits, material property are even.In the present invention, carry out the in small, broken bits of batch by wet ball grinding technology, the efficient height that ball milling is in small, broken bits, the fineness and the material property that obtain powder are even; By contrast, the dry method flouring technology of active service is to adopt the dry method fine grinding technology to carry out the in small, broken bits of batch, and the efficient of one-tenth powder in small, broken bits is lower, and fineness is even inadequately with material property.
(2) no irony is polluted.In the present invention, it is in small, broken bits to utilize ball mill to adopt wet ball grinding technology that batch is carried out, because ball-milling medium often is natural pebble or high aluminium ball egg, so there is not the irony pollution problem; By contrast, the employing dry method fine grinding equipment in small, broken bits of batch in the dry method flouring technology of active service, abrasive body is generally metal material, makes powder polluted by irony easily.
(3) granulation efficiency height.In the present invention, the spraying dried bean noodles device that uses is that what to adopt is " slurry-spraying pelletizing " mechanism, the slurry droplet of ejection is wet nuclear, can be considered to the great powder particle of the uniform humidity of moisture distribution in essence, wet nuclear is wrapped up by the dry powder of disperse again, and by capillary force after moisture diffusion, generate the blank particle.By contrast; what the humidification comminutor that the dry method flouring technology of active service uses adopted is " water spray granulation " mechanism; wet nuclear is to be generated by pure water absorption dry powder; certainly will cause the slow and moisture distribution inequality of moisture diffusion; thereby the growing up of wet nuclear, the formation of blank particle, the regularity of blank particle have been influenced; also strengthen the workload of follow-up round as a ball operation, and then influenced the formation efficiency and the final mass of spherical ingot.
(4) suitable application area is wider.Among the present invention, wet ball grinding is adopted in former abrasive lapping, and water content, hardness and the kind quantity of prescription needed raw material are not had any requirement, all efficiently fine grinding, homogenizing, and be easy to deironing, can satisfy the production needs of whole architectural pottery manufacturing; And active service dry method flouring technology adopts the raw material dry grinding, raw material had stronger selectivity, as require to fill a prescription that hardness simple, various raw materials are close, the water content of raw material can not be too high and want constant or the like, therefore often can only satisfy the manufacturing of glazed tile, and be difficult to satisfy the production needs of high-grade Imitation Rock Porcelain Tiles (also claiming polished bricks), apply thereby be difficult in the whole architectural pottery manufacturing.
Description of drawings
Fig. 1 is a technological process of production schematic diagram of the present invention.
The specific embodiment
In order to understand the present invention better, further illustrate content of the present invention below in conjunction with Fig. 1 and embodiment, but content of the present invention not only is confined to the following examples.
Embodiment 1:
As shown in Figure 1, a kind of technology of preparing blank for constructive ceramic with semi-drying method, it may further comprise the steps:
(1) batching: architectural pottery raw materials for production proportioning routinely, weighing (mass percent): 39.0% feldspar, 13.0% quartz sand, 45.0% clay, 3.0% talcum, put in the ball mill;
(2) wet ball grinding: adopt conventional wet ball grinding technology with raw material fine grinding form slurry in ball mill, the slurry moisture content is 35% (quality), and granularity is that 10000-hole sieve tails over less than 2% (quality);
(3) deironing is sieved: slurry by the iron tramp in the magnetic separator removal slurry, by 140 mesh sieves, is sifted out coarseparticulate again, flow into slurry pool, store standby as slurry;
(4) dry powder preparation: a part of slurry that step (3) is made dewaters and the drier drying by filter press, making moisture content is the dried feed cake of 0.9% (quality), by beating powder equipment, makes granularity less than 100 purpose dry powder again, be transferred to the dry powder feed bin, store standby as dry powder;
(5) spraying dried bean noodles granulation: 1 part of (quality) slurry that step (3) is made sprays into spraying dried bean noodles device, forms the slurry droplet, promptly wet nuclear; 5.5 parts of (quality) dry powder that step (4) is made spray into spraying dried bean noodles device, form the disperse distribution; Wet nuclear contact with the dry powder of disperse attitude, and in dropping process abundant absorption dry powder, the granular dry powder-slurry that generates wet inside and dry outside drips inclusion enclave, the aggregate bin bottom spraying dried bean noodles device of sinking, old 3h is beneficial to inside and starches the branch that drips and spread to outside dry powder;
(6) round as a ball and compacting: will drip inclusion enclave in powder-slurry and spew out into cylinder, and, dry powder-slurry be dripped the round as a ball and compacting of inclusion enclave, and make spherical ingot by gravity;
(7) vibrosieve: spherical ingot by vibratory sieve, is filtered out the spherical ingot of granularity between 0.1～1mm, and triage returns step (4) and is prepared into dry powder again;
(8) moisture is regulated: use drier, the spherical ingot of granularity between 0.1～1mm that step (7) is filtered out dry to the moisture mass content be 6%;
(9) old: with moisture is that 6% spherical ingot is transferred to feed bin, more than the old 48h, obtains to be applicable to the blank for constructive ceramic finished product of compression moulding.
Embodiment 2:
A kind of technology of preparing blank for constructive ceramic with semi-drying method, it may further comprise the steps:
(1) batching: architectural pottery raw materials for production proportioning routinely, weighing (mass percent): 39.0% feldspar, 13.0% quartz sand, 45.0% clay, 3.0% talcum, put in the ball mill;
(2) wet ball grinding: adopt conventional wet ball grinding technology with raw material fine grinding form slurry in ball mill, the slurry moisture content is 33% (quality), and granularity is that 10000-hole sieve tails over less than 2% (quality);
(3) deironing is sieved: slurry by the iron tramp in the magnetic separator removal slurry, by 140 mesh sieves, is sifted out coarseparticulate again, flow into slurry pool, store standby as slurry;
(4) dry powder preparation: a part of slurry that step (3) is made dewaters and the drier drying by filter press, making moisture content is the dried feed cake of 0.5% (quality), by beating powder equipment, makes granularity less than 100 purpose dry powder again, be transferred to the dry powder feed bin, store standby as dry powder;
(5) spraying dried bean noodles granulation: 1 part of (quality) slurry that step (3) is made sprays into spraying dried bean noodles device, forms the slurry droplet, promptly wet nuclear; 4 parts of (quality) dry powder that step (4) is made spray into spraying dried bean noodles device, form the disperse distribution; Wet nuclear contact with the dry powder of disperse attitude, and in dropping process abundant absorption dry powder, the granular dry powder-slurry that generates wet inside and dry outside drips inclusion enclave, the aggregate bin bottom spraying dried bean noodles device of sinking, old 5h is beneficial to inside and starches the branch that drips and spread to outside dry powder;
(6) round as a ball and compacting: dry powder-slurry is dripped inclusion enclave spew out into rotating disk,, dry powder-slurry is dripped the round as a ball and compacting of inclusion enclave, make spherical ingot by centrifugal force;
(7) vibrosieve: spherical ingot by vibratory sieve, is filtered out the spherical ingot of granularity between 0.1～1mm, and triage returns step (4) and is prepared into dry powder again;
(8) moisture is regulated: use drier, the spherical ingot of granularity between 0.1～1mm that step (7) is filtered out dry to the moisture mass content be 7%;
(9) old: with moisture is that 7% spherical ingot is transferred to feed bin, more than the old 48h, obtains to be applicable to the blank for constructive ceramic finished product of compression moulding.
Embodiment 3:
A kind of technology of preparing blank for constructive ceramic with semi-drying method, it may further comprise the steps:
(1) batching: architectural pottery raw materials for production proportioning routinely, weighing (mass percent): 39.0% feldspar, 13.0% quartz sand, 45.0% clay, 3.0% talcum, put in the ball mill;
(2) wet ball grinding: adopt conventional wet ball grinding technology with raw material fine grinding form slurry in ball mill, the slurry moisture content is 38% (quality), and granularity is that 10000-hole sieve tails over less than 2% (quality);
(3) deironing is sieved: slurry by the iron tramp in the magnetic separator removal slurry, by 140 mesh sieves, is sifted out coarseparticulate again, flow into slurry pool, store standby as slurry;
(4) dry powder preparation: a part of slurry that step (3) is made dewaters and the drier drying by filter press, making moisture content is the dried feed cake of 0.8% (quality), by beating powder equipment, makes granularity less than 100 purpose dry powder again, be transferred to the dry powder feed bin, store standby as dry powder;
(5) spraying dried bean noodles granulation: 1 part of (quality) slurry that step (3) is made sprays into spraying dried bean noodles device, forms the slurry droplet, promptly wet nuclear; 7.5 parts of (quality) dry powder that step (4) is made spray into spraying dried bean noodles device, form the disperse distribution; Wet nuclear contact with the dry powder of disperse attitude, and in dropping process abundant absorption dry powder, the granular dry powder-slurry that generates wet inside and dry outside drips inclusion enclave, the aggregate bin bottom spraying dried bean noodles device of sinking, old 2h is beneficial to inside and starches the branch that drips and spread to outside dry powder;
(6) round as a ball and compacting: dry powder-slurry is dripped inclusion enclave spew out into rotating disk,, dry powder-slurry is dripped the round as a ball and compacting of inclusion enclave, make spherical ingot by centrifugal force;
(7) vibrosieve: spherical ingot by vibratory sieve, is filtered out the spherical ingot of granularity between 0.1～1mm, and triage returns step (4) and is prepared into dry powder again;
(8) moisture is regulated: use drier, the spherical ingot of granularity between 0.1～1mm that step (7) is filtered out dry to the moisture mass content be 5%;
(9) old: with moisture is that 5% spherical ingot is transferred to feed bin, more than the old 48h, obtains to be applicable to the blank for constructive ceramic finished product of compression moulding.
Claims (1)
1. the technology of a preparing blank for constructive ceramic with semi-drying method is characterized in that it may further comprise the steps:
(1) batching: each raw material of architectural pottery raw materials for production proportioning weighing routinely, put in the ball mill;
(2) wet ball grinding: adopt conventional wet ball grinding technology with raw material fine grinding form slurry in ball mill, the slurry moisture content is 33～38% (quality), and granularity is that 10000-hole sieve tails over less than 2% (quality);
(3) deironing is sieved: slurry by the iron tramp in the magnetic separator removal slurry, by 140 mesh sieves, is sifted out coarseparticulate again, flow into slurry pool, store standby as slurry;
(4) dry powder preparation: a part of slurry that step (3) is made dewaters and the drier drying by filter press, make the dried feed cake of moisture content, by beating powder equipment, make granularity again less than 100 purpose dry powder less than 1% (quality), be transferred to the dry powder feed bin, store standby as dry powder;
(5) spraying dried bean noodles granulation: the slurry of 1 part of quality that step (3) is made sprays into spraying dried bean noodles device, forms the slurry droplet, promptly wet nuclear; The dry powder of 4～7.5 parts of quality that step (4) is made sprays into spraying dried bean noodles device, forms the disperse distribution; Wet nuclear contact with the dry powder of disperse attitude, and in dropping process abundant absorption dry powder, the granular dry powder-slurry that generates wet inside and dry outside drips inclusion enclave, the aggregate bin bottom spraying dried bean noodles device of sinking, old 2～5h is beneficial to inside and starches the branch that drips and spread to outside dry powder;
(6) round as a ball and compacting: with dry powder-slurry drip an inclusion enclave spew out into cylinder by gravity or will or dry powder-slurry drip an inclusion enclave and spew out into rotating disk by centrifugal force, dry powder-slurry inclusion enclave is round as a ball and tamp, make spherical ingot;
(7) vibrosieve: spherical ingot by vibratory sieve, is filtered out the spherical ingot of granularity between 0.1～1mm, and triage returns step (4) and is prepared into dry powder again;
(8) moisture is regulated: use drier, the spherical ingot of granularity between 0.1～1mm that step (7) is filtered out dry to the moisture mass content be 5～7%;
(9) old: with the moisture mass content is that 5～7% spherical ingot is transferred to feed bin, more than the old 48h, obtains to be applicable to the blank for constructive ceramic finished product of compression moulding.
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