CN1788962A - Ceramic blank pulping process using basket type sand mill as mainbody - Google Patents

Abstract

The ceramic biscuit slurry preparing technological process is one completely new efficient energy-saving process with basket type sand mill as main grinding apparatus and high shearing emulsifying machine as dispersing apparatus. The technological process includes weighing the first material and the second material and feeding separately into the dispersing tank to reach required fineness and granular grading, preparing slurry in a high shearing emulsifying machine, pumping the slurry into different grinding pots to grind in basket type sand mill to reach required fineness and granular grading, and pumping the first material and the second material to mixing tank for mixing homogeneously via stirring. The technological process has the basket type sand mill replacing ball mill to reduce the slurry preparing power consumption to 40 %, raise the work efficiency to 6-10 times, raise the component stability, the technological process of the slurry and the quality of final product.

Description

A kind of ceramic blank pulping process based on basket type sand mill

Technical field

The present invention relates to a kind of new process for preparing ceramic batch, it is main milling apparatus with basket type sand mill, is dispersing apparatus with the high-shear emulsion machine, is a kind of brand-new, ceramic novel pulping method efficiently.

Background technology

Slurrying is the important step in the Production of Ceramics process.The quality of prepared slurry directly influences the quality of final products.Because ball mill is simple in structure, operation is reliable, maintenance management is easy, the energy long-time running, be convenient to again and other coarse crushing equipment, unite use, can constitute a comparatively complete blank crushing and grinding pulping system as jaw crusher, hammer mill, edge runner etc., brought into play important effect in ceramic pulping process, it is the pulping system of milling apparatus that most up to now ceramic enterprises still adopt with the ball mill.

Certainly should see, be the pulping system of main equipment with the ball mill, is suitable for the extensive style raw material.Ball mill is adapted to quartz very much, feldspar is block raw ore, and one of clay raw materials is seldom processing also, mainly based on the ceramic pulping process of pulverizing with grinding.

Now, greatly improve in the source of ceramic raw material, though, also having very long distance from " standardization raw material " that former national China National Light Industrial Products Department advocated, a lot of specialized ceramic raw material processing enterprise has appearred.A lot of ceramics factories especially resemble the enterprise of the such manufacture ceramic main of electroceramics factory, and roughing and the thinner raw material of granularity have been passed through in use mostly, and are many in the past to be natural materials such as block quartz, feldspar, now have powder to buy more.The also process such as pottery is washed, removal of impurities of having passed through of one of clay raw materials more.Some industrial ceramics, as aluminium oxide ceramics, used raw material is industrial raw material mostly, and as the commercial alumina raw material, its average grain diameter is about about 50 microns, and the average grain diameter after processing is milled down to is 3.8 microns.This illustrates that ceramic pulping process has been main the transformation for to mix and grinding by original pulverizing and grinding.At this moment,, continue to continue to use pulping system, be difficult to realize good cost performance based on ball mill if do not take the variation of raw material condition into account.

As everybody knows, there are the following problems based on the pulping system of ball mill: the one, and operational efficiency is low, and effectively merit only accounts for about 1～2%, thereby will make slurry reach technological requirement, must increase milling time, increasing energy consumption; The 2nd, the abrasive body that weares and teares in the mechanical milling process, the liner of ball mill easily cause the fluctuation of paste composition, thereby influence product quality; The 3rd, though the ball mill regular maintenance is simple, the regularity of changing ball mill liner length still consuming time, interpolation abrasive body is poor; The 4th, noise is big during the ball mill operation, works under hard conditions.Thereby seek better that equipment substitutes ball mill, to improve the quality of slurrying quality and even product, the energy consumption of reduction slurrying has very big meaning.

In general, improve grinding effect, can start with from two aspects, the one, increase the kinetic energy of abrasive body, another is the effective collision that improves between storeroom and material and abrasive body.The running speed of raising equipment is to improve the best way of kinetic energy and effective collision.Because ball mill mainly is a centrifugal action of utilizing cylindrical shell rotation to produce, make abrasive media rise to certain altitude with cylindrical shell after, because of self gravitation falls with nearly parabolic path, impact that material pulverizes.So, make the impact kinetic energy maximum of abrasive media to material, mainly be to make abrasive media that maximum descent altitude is arranged.Yet when drum's speed of rotation was too high, abrasive media turned round with cylindrical shell, did not have any impact grinding effect.If speed is low excessively, material and abrasive body all only roll in the cylindrical shell bottom, and kinetic energy and effective collision are all very low, thereby grinding efficiency is also very low.These characteristics have determined ball mill can not become high-efficient grinding equipment.

In order to improve the grinding efficiency of equipment, vibromill arises at the historic moment with the stirring mill.Their common feature be exactly the abrasive body movement velocity without limits, can obtain bigger kinetic energy and improve effective collision by strengthening oscillation intensity or improving the agitator running speed, thereby can improve the work efficiency of grinding greatly.In addition, because the capacity usage ratio height, energy consumption reduces greatly.But vibromill is had relatively high expectations owing to component of machine (spring, bearing etc.) mechanical strength, and has limited it to large scale development.And stir mill if will maximize, must strengthen overall dimensions, yet its stirrer diameter size is subjected to the restriction of linear velocity and draw ratio also suitable, in addition, stirring mill will be with a large amount of abrasive body, and this both can increase the slurrying cost, also can influence the composition of slip because of the wearing and tearing of abrasive body.Therefore, it is many between 50～500L to stir at present the mill volume, also needs to prepare refluxing units such as dispersion machine, complicated pipeline and pump, hand stock, and labour intensity is big, easy cleaning not, the difficulty of reloading, the inconvenience dismounting, it is difficult to safeguard, and a common equipment is only produced a kind of product.So,, yet do not have and can be applied in the industrial production on a large scale although stir barreling mill excellent in efficiency.

In a word, improving ceramic slurrying efficient, reduce the pulping process energy consumption, improve stock quality, is a problem that presses for solution.Employing is based on the new method pulping process of basket type sand mill, and replacing traditional ball mill is that main pulping process has very big meaning.

Summary of the invention

Purpose of the present invention just provides a kind of efficient, energy-conservation, easy-operating ceramic pulping process method, this method is dispersing apparatus with the high-shear emulsion machine, with the basket type sand mill is milling apparatus, has constituted a collection and has disperseed, grinds, is mixed into the pulping system of one.Prepared ceramic mud stable components, the granularity of this method is little, is evenly distributed, and grain composition is good, and various processing performances can both satisfy the requirement of ceramic process.

Key of the present invention is to replace the ball mill of poor efficiency high energy consumption to prepare ceramic size with energy-efficient basket type sand mill.The basket type sand mill that is adopted, be to stir a kind of novel, efficient, the energy-conservation milling apparatus that improvement grows up on the mill basis, the similar stirring mill of its basket inner structure, its agent set has parts such as power transmission shaft, mill basket, self-priming impeller, abrasive disk (milling bar), screen cloth, abrasive media, dispersion impeller.Operation principle is similar to circulating stirring mill, but stirred vessel is designed to basket bodily form formula, during work the immersion of basket body is being contained in the grinding pot of liquid material, and main shaft drives self-priming impeller, abrasive disk (bar), abrasive disk, dispersion impeller high speed rotating.Just because of this high speed rotating, produce powerful suction force and eddy current, the self-priming impeller is sucked material in the mill basket; Abrasive disk (bar) is then stirring at a high speed rotation of abrasive body (zirconium oxide bead), stirs abrasive media, gives abrasive media enough kinetic energy, by the abrasive media of high-speed motion material is applied shearing force and impulsive force, and material fully disperses, refinement thereby make; Dispersion impeller then can produce negative pressure and bigger suction force between mill basket bottom and dispersion impeller, material in the mill basket is sucked out.Simultaneously, centrifugal force powerful when disperseing to rotate at a high speed produces stronger pumping action, will throw away by the material of sucking-off from mill basket, and material is fully circulated, and quickens material dispersed.So, material is constantly done regular, high efficiency circulation from bottom to top in grinding pot, make the liquid raw material be able to high efficiency grinding, dispersion, mixing.Therefore, basket type sand mill has changed traditional dispersion grinding mode, when it is not done as the stirring grinder, need complicated pipeline, pump and material transmission equipment, also changed traditional dispersion grinding mode, material dispersed, grinding can be finished in an equipment, thereby the space and the energy have been saved, and improved product quality, and be equipped with the rapid slurry of high-shear emulsion machine, high speed pre-mixing, also can improve the slurrying work efficiency of pottery greatly.In addition, the basket body structure is succinct, and it is convenient to clean, and safeguards easily, and is therefore both cheap as ball mill operating cost, also energy-efficient as stirring mill based on the equipment of basket type sand mill, is very suitable for the slurrying of various potteries.

The present invention is based on the process of the ceramic pulping system of secondary batching, substitute the intermittent ball mill of traditional handicraft with many energy-efficient basket type sand mills, and adopt closed semi-automation-fully-automatic production, thereby can reduce production costs, improve output, reduce floor space, improve production environment, make the production distribution compactness.Its characteristics are as follows:

1, adopting basket type sand mill is main milling apparatus, its rotating speed height (can reach 1440r/min) abrasive media little (1.8-2.5mm), media impact probability and kinetic energy are increased greatly, and medium is the little zirconia balls of the high wearing and tearing of hardness, therefore grinding efficiency improves (than fast 6～10 times of ball mill) greatly, and power consumption reduce greatly (less than ball mill slurrying 40%), production cost reduces.In addition,, can increase substantially output, cut down the consumption of energy because milling time shortens greatly.

2, adopt high-shear emulsion machine pre-dispersed, it can mix raw material and water in very short time (5-10 minute); In addition, remove big stone and thick quartz sand with bag filter (20 order) scalping after the emulsification, make the diameter of solid particle in the slip reach basket type sand mill and grind desired size (be generally abrasive media diameter 1/5～1/6), thereby improved the grinding efficiency and the dispersion mixing of basket type sand mill greatly.

3, adopt the related pulping system of the utility model, can guarantee the oepration at full load of key equipment, thereby improve grinding efficiency, reduce operating cost.

4, kettle is hermetically sealed, and slip is carried by pipeline with pump, and equipment is controlled by electrical apparatus control system, and no dust cleaner production can realize semi-automation; And the floor space of equipment is little, makes workshop integral layout compactness.

Description of drawings

Accompanying drawing 1 is the ceramic pulping process flow figure of secondary charging; 2 in accompanying drawing is once reinforced ceramic pulping process flow figure; The size distribution of accompanying drawing 3 ball mill pulping process; The size distribution of Fig. 4 basket type sand mill pulping process.

As shown in Figure 1, the ceramic pulping process flow of basket type sand mill secondary batching is as follows: weigh up head material, the used various raw materials of two material by the prescription requirement earlier, the head material is placed to add feed bin earlier, and stand-by.When slurrying begins; earlier in emulsion tank, added water, started high-shear emulsion machine, by certain speed by technological requirement; load weighted head material is poured into from add feed bin in the emulsion tank gradually (after the head material adds; again two material are put into and are added feed bin), behind emulsification 4～8min, shut down; start membrane pump; slip is extracted out from emulsion tank, removed coarse granule impurity, be pumped into again in No. 1 grinding pot through 20 purpose bag filters.After the basket body for the treatment of basket type sand mill is immersed in and goes in the slip, start basket type sand mill, grind 1.5～3h after, the screen over-size of shutdown inspection slip and size distribution, reach technological requirement after, start membrane pump, slip is extracted out from grinding pot.After head material slip exhausts from emulsion tank, two material are also changed slurry in emulsion tank, be extracted into afterwards in No. 2 grinding pots and grind 20～30min by above-mentioned technology.Ground slurry is all put into blend tank through 80 order bag filter removal of impurities, adds water and adjusts slip viscosity, after mixing, by the technological requirement deironing of sieving, is finished product mud again, can deliver in the follow-up corresponding operation.

This technological process also can be used for the ceramic pulping process that once feeds intake, and as shown in Figure 2, specific implementation process is as follows: weigh up various raw materials by the prescription requirement earlier, place to add feed bin, and stand-by.When slurrying begins; earlier in emulsion tank, added water, started high-shear emulsion machine, by certain speed by technological requirement; the raw material that will add in the feed bin is poured in the emulsion tank (after this material adds gradually by certain speed; again another load weighted raw material is put into and is added feed bin), behind emulsification 4～8min, shut down; start membrane pump; slip is extracted out from emulsion tank, removed coarse granule impurity, be pumped into again in No. 1 grinding pot through 20 purpose bag filters.After the basket body for the treatment of basket type sand mill is immersed in and goes in the slip, start basket type sand mill, grind 1.5～3h after, the screen over-size of shutdown inspection slip and size distribution, reach technological requirement after, start membrane pump, slip is extracted out from grinding pot.After the slip of first material side exhausts from emulsion tank, by above-mentioned technology second material side also changed slurry in emulsion tank, be extracted into afterwards in No. 2 grinding pots and grind 1.5～3.0h.Because the time of emulsification is shorter relatively, after, two grinding pots use in turn, can improve the efficient of whole slurrying.Ground slurry is all put into corresponding mud pit through 80 order bag filter removal of impurities, adds water and adjusts slip viscosity, by the technological requirement deironing of sieving, is finished product mud again, can deliver in the follow-up corresponding operation.

Embodiment 1: the secondary batching pulping process flow of certain electroceramics factory

This factory owner will make the high strength SF6 insulated porcelain sleeve that 220kV uses, used raw material has calcined bauxite in powder, feldspar powder, porcelain powder, Fujian mud, Zuoyun soil, Xiang Tan mud etc., during with ball mill slurrying, adopt the technology of secondary batching, with non-plastic raw material calcined bauxite in powder, feldspar powder, porcelain powder, and the Fujian mud of very difficultization slurry is as head material (account for whole batching 65%), place ball mill to grind 16～18h earlier, add remaining Zuoyun soil again and grind about 2h, can be met the mud of technological requirement with Xiang Tan mud (two material).The size distribution curve of prepared slip such as accompanying drawing 3.

Use pulping process of the present invention, be total to 162.5kg (calculating) by the good calcined bauxite in powder of prescription requirement weighing, feldspar powder, porcelain powder and Fujian mud earlier with siccative, in the cylinder of stainless steel, add suitable quantity of water earlier, start the high-shear emulsion machine of 7.5kW 3001, three kinds of powders are poured in the cylinder, can change slurry less than 1min, the Fujian mud with bulk slowly joins in the cylinder again, after the head material all adds well, emulsification disperses 8～9min again, changes slurry and finishes.Basket type sand mill with 18.5kW grinds 107min again, every size indicator, especially screen over-size has reached technological requirement, add Zuoyun soil and Xiang Tan mud (87.5kg altogether) starched well with high-shear emulsion machineization again, grind 12min with basket type sand mill jointly with the head material, every index has all reached technological requirement, and its size distribution curve is seen accompanying drawing 4.

Embodiment 2: the pulping system that once feeds intake of certain industrial ceramics factory

This factory owner will make 90～95% alumina ceramics, and its raw material is the commercial alumina that is mainly 60 μ, after the ball milling slurrying, and spray drying granulation, the die pressing moulding is burnt till with the shuttle kiln of liquefied petroleum.Used ball mill is a liner with rubber now, is abrasive body with alumina balls, and milling time is 26～28h, and the average grain diameter of final mud is 3.8 μ.

Use pulping process of the present invention, earlier by the amount (about 100kg) of prescription requirement weighing commercial alumina and raw material thereof, in volume is 1001 cylinder, the adding suitable quantity of water, start high-shear emulsion machine, again each powder is poured in the cylinder, after reinforced the finishing, disperseed 5～6min again, afterwards, basket type sand mill with 7.5kW grinds 140min again, and various indexs all reach the parameter of ball mill, and follow-up technical process is not had harmful effect.

Claims (5)

1, the present invention relates to a kind of new method for preparing ceramic batch mud, this method is main milling apparatus with basket type sand mill, with high-shear emulsion machine and other serving as of auxiliary equipment slurry dispersing apparatus.Both can be used for the ceramic slurrying of secondary batching, also can be used for the ceramic slurrying that once feeds intake.

2, the ceramic slurrying of the related secondary batching of claim 1, mean the part material in the batching (mostly is the raw material of the difficulty mill of lean property, be called for short " head material "), drop in the milling apparatus earlier and grind a period of time, after granularity reaches technological requirement, again surplus stock (being called for short " two material ") is joined the pulping process that grinds in the milling apparatus together.Once feed intake then refer to the batching in the disposable pulping process that grinds in the milling apparatus of putting into of whole raw materials.

3, the related ceramic batch secondary batching slurrying of claim 2 may further comprise the steps: by the prescription requirement, the good head of weighing expects, places that to add feed bin standby.Add suitable quantity of water in emulsion tank, start high-shear emulsion machine, the head material that will add again in the feed bin joins in the emulsion tank with suitable speed, emulsification after 4～10 minutes again behind reinforced the finishing, with the mud sucking-off, sieve (20 order) removes coarse granule impurity by sand pump or membrane pump, be pumped into again in the grinding pot that basket type sand mill is installed, after grinding 1.0～2.5h, sampling and measuring screen over-size and size distribution again are after reaching technology controlling and process and requiring, sieve in (80 order), pump in the blending tank.Two material of weighing simultaneously when waiting head material to be added to dispersion tank from add feed bin, place two material to add feed bin again.When the head material pumps into grinding pot and grinds, " two material " that weigh up by disperseing in emulsion tank according to a material mode, is sent to afterwards in No. two grinding pots again and grinds 20～30min, cross 80 mesh sieves, be pumped into blending tank again after.In blending tank, head material and two material are mixed by alr mode, can add suitable quantity of water, adjust mud viscosity, by the technological requirement deironing of sieving, promptly get the finished product mud that can enter subsequent processing again.

4, the slurrying that once feeds intake of the related ceramic batch of claim 2 may further comprise the steps: by the prescription requirement, good each raw material of weighing places that to add feed bin standby.In emulsion tank, added water by technological requirement, start high-shear emulsion machine, to join in the emulsion tank successively by the load weighted ceramic raw material of prescription requirement again, after the emulsification 5～10 minutes, by sand pump or membrane pump with the mud sucking-off, sieve in (20 order), remove coarse granule impurity, be pumped into again in No. 1 grinding pot that basket type sand mill is installed, after grinding 1.0～2.5h, take a sample to check again screen over-size and size distribution, reach the technology controlling and process level after, (80 order) sieves, put into mud pit, can add suitable quantity of water, after adjusting mud viscosity, by the technological requirement deironing of sieving, promptly get the finished product mud that can enter subsequent processing again.When No. 1 grinding pot grinds, prepare another batching by above-mentioned order, after high shear disperses, enter into No. 2 grinding pots and grind, the blank that mill is good is put into mud pit equally and is handled.Can give full play to the effect of high-shear emulsion machine like this, improve the work efficiency of slurrying.

5, according to claim 3,4, technology involved in the present invention has replaced ball mill with basket type sand mill, the power consumption that makes base less than ball mill slurrying 40%, work efficiency, stable components higher 6～10 times than ball mill, thereby can improve the processing performance of ceramic batch mud and the quality of product greatly.

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