CN1056442A - Spherical granular barium carbonate industrial production method and prilling granulator - Google Patents

Abstract

A kind of spherical granular barium carbonate industrial production method; be that mealy barium carbonate is passed through the direct granulating and forming of granulating disc of the present invention in the presence of binding agent; obtain spherical granular raw material; promptly obtain the spherical granulated product of certain particle diameter behind sintering, screening, iron removal step, quality index such as its profile, granule strength and granulation mass proportion all are better than currently available products.Described binding agent is the aqueous solution that contains polyvinylpyrrolidone or hydroxy propyl cellulose or Walocel MT 20.000PV, and it is all volatilizations in sintering.Prilling granulator of the present invention is one by motor-driven granulating disc, and there is the spray gun of jet binder the tablets press top, and the baffle plate of control flow direction of material and grading is arranged in the shell.Technology of the present invention is simple, and flow process is short, good quality of product.

Description

Spherical granular barium carbonate industrial production method and prilling granulator

The present invention relates to production method and the prilling granulator thereof of a kind of industrialization, belong to the barium carbonate agglomeration technique with semidrying production form of spherical particles barium carbonate.

Barium carbonate is the extremely wide inorganic salt of a kind of purposes, it is the important source material of industry such as chemical industry, light industry, machinery, pharmacy, building materials, electronics, in recent years, the particularly application aspect ferrite magnetite, opticglass, televisor cathode tube and special cermacis, cheap because of it, its consumption is doubled and redoubled.Barium carbonate can be divided into powdery and granular on profile, granular barium carbonate is because good fluidity, bulk specific weight is big, be easy to transportation, conveniently store, be difficult for the knot plate, be convenient to realize many advantages such as the production automation, serialization, be the trend that progressively replaces powder-like product, its commodity value also obviously is better than powder-like product.The outlet of China barium carbonate occupies second place of the world (being only second to Germany), but the agglomeration technique of China's industrial production barium carbonate still mainly is to adopt early eighties, mid-term technology and the equipment from external introduction at present, divides two kinds of wet granulation and non-slurry pelletizings.The wet granulation flow process is: with moisture about 20% barium carbonate filter pulp behind the filter dehydration is raw material, in kneader, mix and pinch into little agglomerate with particulate from whole grain operation off grade size, through 800-1200 ℃ of following high temperature sintering, the agglomerate melt surface becomes the sintered particles of 3-5mm, after the cooling to be cooled, again through repeatedly whole, screening operation, i.e. vibratory screening apparatus-crusher (coarse crushing)-vibratory screening apparatus-crusher (in small, broken bits)-vibratory screening apparatus, through deironing, obtain irregular particulate product again.The non-slurry pelletizing flow process is to be raw material with the mealy barium carbonate; become to have the thin slice or the thin bar of certain intensity by cylinder tabletting machine high-pressure extrusion; through crusher in crushing, behind the whole grain of pelletizing machine (rough), obtain irregular particulate product through bolting, pelletizing machine granulation (thin system) again.Above-mentioned barium carbonate agglomeration technique from external introduction, no matter be wet method or non-slurry pelletizing, all exist following deficiency: 1, granulated product exists two fatal shortcomings of common, the one, the profile of product is irregular, uneven, and bulk density is less; The 2nd, the granule strength of product is not high, still has more flour, and its meal can reach 24% at most.The basic reason that causes these two kinds of shortcomings is because granulated product all is after being crusher in crushing, causes through repeatedly pelletizing machine, vibratory screening apparatus shaping, rather than directly obtains meeting particle diameter requirement, the uniform and smooth spheroidal particle product in surface.This of product two kinds " congenital defects " is no matter which kind of aftertreatment measure of employing all can not produce the effect that makes the people satisfied.2, because the common thinking of wet method or non-slurry pelletizing is to adopt; Preliminary moulding (little agglomerate or thin bar thin slice)-raising intensity (sintering or high-pressure extrusion operation)-fragmentation-screening-moulding again (whole grain operation), so its essence granulation flow process is all longer, as the wet granulation operation is two-stage crushing, three grades of screenings, and the non-slurry pelletizing operation is one-level fragmentation, secondary whole.So two kinds of granulation flow processs all can not shorten, and product strength can not improve, and meal can not reduce in the product.For above-mentioned reasons, latter stage mid-1980s China relevant department and manufacturer coordination tackling key problem barium carbonate agglomeration technique once, but fail the progress of making a breakthrough property eventually because of various reasons always.

Purpose of the present invention is intended to propose that a kind of technical process is shorter, equipment and the investment barium carbonate agglomeration technique and the prilling granulator that all improve a lot of its product design and granule strength simultaneously still less, thereby overcomes the deficiencies in the prior art.

Main points of the present invention are directly to adopt granulating disc; with the mealy barium carbonate is raw material, and adding entry is binding agent, a direct step granulating and forming; again through aftertreatment measures such as sintering improving granule strength, thereby all superior spheroidal particle product of the outward appearance of producing and quality.It is binding agent that the present invention preferably adopts the aqueous solution that contains polyvinylpyrrolidone or hydroxy propyl cellulose or Walocel MT 20.000PV, and wherein water accounts for 95-100%.

Below in conjunction with accompanying drawing technology of the present invention and prilling granulator are elaborated.

Fig. 1 is a process flow diagram of the present invention;

Fig. 2 is a granulating disc structural representation of the present invention;

Fig. 3 is the vertical view of Fig. 2.

Among Fig. 2-3, the 1-spray gun, the 2-shell, the 3-rotating shaft, 4-electric motor, 5-are lived and are connected 6-chassis, 7-baffle plate.

Process of the present invention is summarised as: in powder raw material, add 0.5-15%(weight, lower with) binding agent, carry out granulation at diagram disc granulation machine, after direct sintering, cooling, namely obtain spherical pelletized product through screening, deferrization operation. The key of its flow process is the granulation operation, and disc granulation machine of the present invention then is the key that at all solves the product inadequate natural endowment of prior art production. Details are as follows to process of the present invention below in conjunction with accompanying drawing:

1, directly granulation moulding: the mealy barium carbonate raw material is delivered in the disc granulation machine under the normal pressure; simultaneously; the spray gun (1) that is placed on the disc granulation machine crossbeam sprays into binding agent with the pressure of 0.05-0.5 MPa, i.e. the polyvinylpyrrolidone of moisture 95-100% or hydroxyl propyl cellulose or the cellulosic aqueous solution of methylol. The disc granulation machine is at 5-60 degree inclination angle, and by batcher continuous feed operation, the spherical pelletized product with certain particle diameter then outwards overflows from the comminutor lowest part in time of staying 2-30 minute the scope. Binding agent has been bonding, lubricated, burnishing action, and it can not change the chemical composition of material, and all volatilizations in sintering process, and product content is not had impact.

2, sintering: by disc granulation machine-processed spherical granular raw material deliver in the rotary kiln directly with burning knot, sintering temperature is 650-1100 ℃, the time of staying is 7-45 minute, the grog behind the sintering is delivered to the rotating cylinder cooler and is cooled to normal temperature-60 ℃.

3, screening deironing: send in the sieve apparatus through cooled barium carbonate grog and to sieve, the product that meets the particle diameter requirement is delivered under the electromagnetism magnetic separator de-ironing after the deironing, promptly obtains outward appearance and is the granular product spherical, that powder containing quantity is few, granule strength is high.Returning charge after the screening is sent into granulating disc granulation again after pulverizer is pulverized, the returning charge amount is 5-30%.

With reference to Fig. 2, Fig. 3, granulating disc of the present invention is to be become one certain thickness disc is arranged by movable connect (5) by chassis (6) and shell (2), disk bottom is connected with electric motor (4) mutually by rotating shaft (3), by its driven rotary, disc becomes certain pitch angle with horizontal plane; Spray gun (1) is to be placed on the crossbeam of this granulating disc.The several piece 1-5 centimetre of baffle plate that wide metal sheet is made (7) is housed in shell (2), and its number is decided as required, is illustrated as 3.The setting of this baffle plate (7) is in order to control flow direction of material, and helps product is carried out preliminary classification automatically.By changing shell (2) and changing the product that parameters such as pitch angle can granulation obtain different-grain diameter.Granulating disc of the present invention can clearly be observed granulation operation whole process, and it is simple to operate, can grasp in the short period of time and does not need special training at the utmost point, uses the phenomenon that this tablets press can not generation blocking pipe as spray granulating.

Processing method of the present invention and prilling granulator have fundamentally been broken through the current technology flow process, promptly change into: the flow process of a step direct granulating and forming-raising granule strength.The present invention compares with existing wet granulation, operation will be mediated and granulating working procedure unites two into one, and loaded down with trivial details multiple stage crushing, multi-stage screening only be reduced to the one-level screening, energy consumption index (energy consumption when mainly referring to sintering) reduces more than 60%, compares with existing non-slurry pelletizing, and flow process is shorter, equipment still less, quality product is better, and the structure of its key equipment-prilling granulator is very simple, and is easy to maintenance.Therefore, technical process of the present invention is short, and equipment is simple, and is easy to operate, especially the quality product height; Indexs such as particle roundness, particle slickness, granule strength, granulation mass proportion all obviously are better than the product that existing introducing equipment and flow process make, thereby to ability to earn foreign exchange and the competitive power that improves this traditional large exporting of China crucial effect will be arranged.

Embodiment: 50kg barium carbonate powder (median size is 1.6-2.1 μ m) is added in the granulating disc; it is binding agent that spray gun (1) sprays into the 0.5% polyvinylpyrrolidone aqueous solution with the pressure of 0.12MPa; its consumption is 4% of a powder; granulating disc rotates with 45 ° pitch angle; 20 rev/mins of rotating speeds; material mean residence time 5 minutes; directly obtain the spherical raw material of particle diameter 0.154-2.0mm; send in the rotary kiln directly with burning knot; 780 ℃ of sintering temperatures; mean residence time made spherical grog in 30 minutes; again grog is sent in the water cooler cooling 10 minutes, be cooled to 58 ℃, send into then in the vibratory screening apparatus after the screening; send into the deironing of electromagnetism magnetic separator de-ironing, obtaining particle diameter at last is the form of spherical particles product 41.2kg of 0.154-0.8mm.Returning charge after the screening all after pulverizer is pulverized, is sent into granulation again in the granulating disc again.The quality contrast of this embodiment gained granulated product and existing wet method, non-slurry pelletizing product is seen attached list.

Subordinate list: embodiment of the invention product and the contrast of prior art products quality

Claims (6)

1; a kind of spherical granular barium carbonate industrial process; with powdery carbon barium is raw material; the invention is characterized at first sends into powder raw material in the granulating disc that is certain pitch angle in the presence of binding agent; directly granulation in certain residence time; obtain the form of spherical particles raw material; again through sintering; screening; behind the iron removal step; promptly obtain meeting the spherical granulated product of certain particle diameter requirement; described binding agent is the aqueous solution that contains polyvinylpyrrolidone or hydroxy propyl cellulose or Walocel MT 20.000PV; wherein the ratio of water is 95-100%; the binding agent consumption is the 0.5-15% of inventory, and described binding agent sprays in the material with the pressure of 0.05-0.5MPa.

2, method according to claim 1 is characterized in that the residence time of material in granulating disc is 2-30 minute.

3, method according to claim 1 is characterized in that granulating disc becomes 5-60 ° pitch angle with ground level.

4, a kind of prilling granulator that is used to produce spherical granular barium carbonate, it is characterized in that connecting (5) by living by chassis (6) and shell (2) becomes one certain thickness disc is arranged, disk bottom is connected by its driven rotary with electric motor (4) mutually by rotating shaft (3), and becomes certain pitch angle with ground level; Above prilling granulator, be mounted with the spray gun (1) of jet binder, in shell (2), be furnished with some baffle plates (7).

5, prilling granulator according to claim 4 is characterized in that disc becomes 5-60 ° of pitch angle.

6,, it is characterized in that being provided with in the shell (2) three baffle plates according to claim 4 or 5 described devices.