CN85106651A

CN85106651A - A kind of granulating method of dusty material and device

Info

Publication number: CN85106651A
Application number: CN 85106651
Authority: CN
Inventors: 阿尔方斯·克里赫; 沃纳·纳盖尔; 伯恩德·布朗特; 阿尔伯特·彼得斯
Original assignee: Degussa GmbH
Current assignee: Evonik Operations GmbH
Priority date: 1985-09-04
Filing date: 1985-09-04
Publication date: 1987-03-25
Also published as: CN85106651B

Abstract

Dusty material in small, broken bits; precipitated silica for example; by means of two rolls by granulation; one of them roll has a filtering surface, and another then has one one-tenth jacket; two rolls settle make one of them roll mandrel be positioned at another roll mandrel directly over, dusty material in small, broken bits is sent to the roll seam by at least one feed worm.

Description

A kind of granulating method of dusty material and device

Make dusty material; precipitated silica for example; granulation is given molded known simultaneously; the device of Shi Yonging includes for this reason: a filter roller that is positioned in the shell and links to each other with air extractor is with parallel with it; counter-rotational in casing; second roller that is used for moulding makes by a pressure regulation device (DE-PS 1807714) and to keep two rollers pressure together and remain unchanged.

The shortcoming of this known method is: the scope that improves performance is restricted, and the another one shortcoming is: owing to just just make the powder input by bleeding of filter roller, so will can be changed granulation usefulness by the fluctuation of the pile of grounds density of granulation.

The invention provides a kind of method, it by the method that on two rotary rollers, applies negative pressure and mechanical pressure to dusty material in small, broken bits, particularly precipitated silica gives pressure continuously and makes its moulding simultaneously, therefore the effect of bleeding of the porous surface region by the filter roller, and being given, dusty material in small, broken bits is pressed onto on the filter roller exocuticle, this filter roller has at least a part to be embedded in the dusty material when rotated, and, make material on filter roller crust, further be subjected to giving pressure by means of second roller that oppositely moves.Process is given pressure, dusty material in small, broken bits is after thickness is adjusted to evenly, by reverse rotation and apply second of uniform pressure filter roller, or obtain compacting by a roll that has sealing shroud, its volume is compressed to the degree of half originally at least, pass through set die mould on a roller at least then, make above-mentioned material molded, become a kind of stampings with anti-crushing power of certain limit, it is characterized in that, in small, broken bits, dusty material is transported the roll seam by means of at least one follower arm, two rolls be placed make one of them roll mandrel be positioned at another hole roll shaft directly over.

The present invention and then provide a kind of device to realize above-mentioned method, this device comprises: filter roller that is positioned in the casing and is connected with air extractor and be arrangeding in parallel with first roller in this casing and second roller of running in the other direction, second roller has a cover porous or sealing, away from the porous roller surface of roll seam and the spacing distance between the casing inner wall basically, for example, bigger at least three times than the roll seam, at least on a roll, be equipped with and press shape to determine the shape of stampings, pressure apparatus can be adjusted to a constant pressure, it links to each other with the bearing of at least one roll, it is characterized in that, the axle of two rolls settle make one of them be positioned at another directly over and the openend of at least one feed worm be positioned in the roll seam.

Two rolls according to the granulating device that the present invention arranged have two effects: on the one hand, bulky powder material energy quilt is consolidation well; On the other hand, can remove the air that imports with the bulky powder material by means of the filter roller.One deck, for example cermet can be answered in filter roller surface.

In a kind of most preferred embodiment of the present invention, the crust available metal pottery of feed worm is made.

Method of the present invention and device have such advantage: the fluctuation of powder density can compensate by the rotary speed that changes screw rod, therefore no longer needs to adjust in granulation.

Method of the present invention and device will be done more detailed the explanation by accompanying drawing:

Pulverous precipitated silica is loaded in the hopper (2) by opening (1), in hopper, by a spirality agitator (3), silica is stirred.This agitator (3) is driven by mechanism (4) by motor (5).

The precipitated silica that stirred enters horizontally disposed compound transmission screw rod (6) by funnel (2).This compound transmission screw rod (6) is driven by mechanism (7) by motor (8).

Precipitated silica is imported in the granulating device (9) by above-mentioned compound transmission screw rod (6); be brought into then in the gap between two rollers (10 and 11); roll (10 and 11) is placed in by level in the casing of granulating device (9), two axles (12 and 13) of two rolls (10 and 11) install make an axle be positioned at another directly over.

Roll (10) includes a roll frame, and a ceramic-metallic roll sheath is housed on it, and this cover remains under the effect of vacuum.Roll (11) has a molded surface.Two rolls be placed adjustable distance, and produce the pressure of an equilibrium by a hydraulic means.

By the roll gap between the beaming roller (10 and 11) time, Powdered precipitated silica is also discharged from granulating device by opening (14) by granulation.

Following experiment is to finish on the roll pelletizer shown in the above-mentioned accompanying drawing with silica VN3 and Sipernat22.Silica VN3 and Sipernat 22 are through prior dispersion treatment.

In experimentation, roll seam 3mm is stretched to 5mm, in the powder distribution in the screw feeder owing to the stirring action that the agitator in the reservoir is arranged improves.

Experiment condition and experimental result are listed in table 1.

Result of the test has shown emphatically: it is very effective using screw feeder to control the process that material VN3 and Siperat 22 are transported to the roll seam, transport the function of these silicas and do not rely on the height of powder aggregation extent in the roll seam, but greatly depend on the situation of powder distribution in the screw feeder, this also is subjected to the influence (seeing Table 1, stringer 9) that the charging auxiliary device for example adopts a kind of agitator of open type spiral.

Can ignore in the influence of product quality during the power that produces in the conveyer,, in analyzing data, comprise that DBP absorptivity (seeing Table 1, stringer 15) all shows, original material and through difference not between the product of twice conveying because for VN3.For silica Sipernat22, analyze numerical value and show that distribution of particles is converted to finer scope (seeing Table 1, stringer 14) significantly, and absorptivity (representing with the DBP PA) does not reduce (table 1, stringer 15).

Silica VN3 is a kind of precipitated silica, and silica Sipernat22 is a kind of precipitated silica of doing through spray.

Claims

1, a kind ofly make dusty material in small, broken bits, particularly pass through the silica of precipitation, by give the method for pressing moulding simultaneously continuously in the means that add negative pressure and mechanical pressure on the rotary roller: above-mentioned powder in small, broken bits is given on the roll crust that is pressed onto the filter roller by the method for bleeding from the porous surface region of filter roller, have at least a part to be embedded in the pulverulent material during rotation of this filter roller, second roller by means of reverse rotation, material is further given to be pressed onto on the roll crust, through giving pressure, dusty material in small, broken bits after adjusting to uniform thickness by backward rotation and apply second of uniform pressure filter roller, or obtain compacting by a roller that has sealing shroud, its volume is compressed to the degree of half originally at least, then by being contained in a die mould on the roll at least, compression moulding becomes a kind of stampings with anti-crushing power of certain limit, it is characterized in that, dusty material in small, broken bits is sent to the roll seam by means of a feed worm at least, two rolls be placed make one of them roll mandrel be positioned at another roll mandrel directly over.

2, a kind of for realizing the required device of method in the claim 1, it comprises: a filter roller that is positioned in the casing and is connected with inlet manifold assembly, parallel with it with one, backward rotation is filtered roller for second with a cover porous or sealing.Away from the flow roll surface of roll seam and the spacing distance between the casing inner wall basically, for example, big at least three times than the roll seam.Die mould is housed at least to determine the stampings shape on a roll, pressure apparatus can be transferred to a constant compression force and be connected with the bearing of at least one roll, it is characterized in that: roll mandrel be positioned at another roll mandrel directly over, have at least the openend of a feed worm to be positioned in the roll seam.