SU975453A1 - Method for producing granules from powder materials - Google Patents

Description

The invention relates to a technology for the manufacture of granules from various powder materials and can be used, for example, in the processing of moistened bulk materials such as agglomerated mixtures with the main component of manganese dioxide of the positive electrode in the production of galvanic cells *.

A known method of manufacturing granules from powder materials, mainly agglomerate mixtures with the main component of manganese dioxide, comprising pre-compaction of a metered amount of a heated moistened source material and subsequent final compaction [1] ..

The disadvantage of this method is the significant resistance to movement of a waterlogged mixture in the guide channels, which reduces the productivity of the process and reduces the quality of the compacted material. In addition, the pre-compacted material comes in the form of a tape, which does not allow it to be mixed with the additive and also reduces the quality of the granules, ⁵ The purpose of the invention is to increase the productivity of the process and the quality of the seal. "

This goal is achieved by the fact that according to the method of manufacturing granules from powdered materials, mainly agglomerate mixtures with the main (component of manganese dioxide, including preliminary compaction of a dosed ^15th amount of heated moistened starting material and subsequent final compaction, the starting material is heated to 50 ₂₀ 70 ° C , during pre-compaction, a semi-finished product is obtained, giving the material a tile shape.

In this case, before the final compaction, the starting material was added3 to the amount of 5-30% by weight of the semi-finished product.

The method is as follows.

preliminarily, an agglomerate mixture is obtained by dry mixing several initial powders. and moistening the resulting mixture with liquid components. The processing process is carried out in a moving or suspended layer by sawing the liquid components into a volume of powder material. Then the processed mixture is fed from above into a heated hopper with a conical loading auger, for example, a roller press. The heated mixture with a temperature of 50-70 ° C is pulled by rolls rotating in the opposite direction to the rotatable gap and previously ·. is molded in the form of tiles, I; the width of which is equal to the accepted clearance ·.

Bulk mixtures containing powdered manganese dioxide, graphite

975453 4,

The strength of the compacted granules of the product increases 1.5 times from ΙΟΙ 4 kgf / cm ² to 15 “30 kgf / cm ² . The method of static analysis is used to evaluate ₅ distribution of the liquid component in the volume of the layer.

The addition of moistened powdery material in an amount of 5 to 30% by weight of the loaded tiles, 10 improves the rheological and physicochemical properties of the product, helps to reduce pressure and increases the performance of compaction. from 260 kg / h to 300 kg / h.

An increase in the additive content of more than 30% is uneconomical and has little effect on the further conduct of the product compaction process.

Example. Previously, dry and wet mixing of loose components and liquid additives of the positive electrode mass in an amount of 25,200 kg was carried out in a 2-vertical biconical mixer of the RS-200 type. Agglomeration and soot were obtained, ESH-35 electrolyte solutions (700 g / l KOH), industrial oil · were poorly retained in their composition, as well as due to insufficient product porosity.

Liquid additives in the mixture at an atmost temperature have a sufficiently high viscosity and are distributed on the surface over an hour!., W of the product layer in a thick layer, in? for which there is uneven impregnation of the layer with liquid.

verification heating of the mixture before compaction (rolling) to 5070 ° C reduces the viscosity of the liquid liquid in the layer, contributes to the improvement of their absorption in the mixture, the best retention ™ and eliminates their leakage from the product.

A further increase in temperature above 70 ° C does not lead to a noticeable decrease in viscosity, therefore, further heating of the agglomerate mixture is impractical.

Then the tiles of the pre-compacted material are loaded into the compaction chamber of the granulator, formed, for example, by a conveying piston and a perforated grate. Selling the processed mixture in the form of tiles through a perforated grate with a diameter of 2-3 mm is carried out continuously at a pressure of 120,140 atm. ’A positive electrode mixture, which consists of,%: manganese dioxide 72, graphite 11, carbon black 3, industrial oil 2, electrolyte 12. The mixture has a bulk density of 1100 kg / m ^ particle diameter 100-150 microns, wet. 8-8.5%.

The resulting loose agglomeration mixture was added in portions of 0.8-1.2 kg into the loading hopper of the sealing rollers, in which the particles of the mixture were heated to 50–70 ° C. Then the processed mixture was drawn into the gap between the rollers and compacted. At the exit of the rollers, product tiles with a thickness corresponding to the selected gap were formed. The specific compression force with a gap of 6 mm was 20–40 kg / cm at a roll rotation speed of 10–20 rpm. The crushing strength of the mixture tiles was 5 “12 kgf / cm ^1. Further, the tiles of the pressed material were loaded into the seal chamber of the granulator body, in which the transporting piston forced them through the grate in the form of rods that broke off under their own weight at the outlet.

A 5 “30% loose agglomerate ⁵⁵ mixture was loaded into the pellet compaction chamber. The granulation pressure was 120-140 atm, productivity 250-300 kg / h. At the same time, the productivity of the process increased

975953 at / 30 '%>, the strength of the pellets was milled 1.5 times and amounted to 15 “20 kgf / cm ?.

The economic effect of the implementation of the invention is provided by increasing productivity. 5

Claims (2)

39 the starting material is in the amount of the weight of the semi-finished product. The method is carried out as follows: - ;; - 1 way. And: A jar get an agglomerated mixture by dry mixing several raw powders and moisturizing: e (: the resulting mixture is liquid komonegggami. The treatment process is carried out by moving or suspended layer by spraying the liquid components into the bulk powder material. Then the processed mixture is fed from above into heated hopper with a conical feed screw, for example, a roller press. You burn a mixture with a temperature of 50-70 ° C and rolls with rollers rotating Li in the opposite direction, in red., g; and it is preliminarily molded in the form of tiles whose thickness is equal to the received gap. Bulk mixtures containing powdered manganese dioxide, graph u sa} ;; y, poorly hold in their cocvase electrolyte solutions ECH-35 {/ OU g / l con), industrial oil:, WHSD due to insufficient pores; 7 77 -1 of the product .. Liquid additives in the mixture at atmospheric pressure. PG: OH temperature has sufficient viscosity and is distributed during the treatment on the surface of the hour, a layer of the product in a thick layer, in: a lot of which happens unevenly,. :. impregnation of a layer with a liquid, p .:;; dzing heating the mixture by re-compaction (rolling) to 5070 ° C reduces viscosity. At the same time, it helps to improve i:; iiO absorb them into the mixture, better retain them and prevent them from flowing out product. A further increase in the temperature of more than 70 ° C does not lead to a noticeable decrease in viscosity; therefore, further heating of the agglmerate mixture is not advisable. The tiles of the pre-compacted material are then loaded into the compaction chamber of the granulator, formed, for example, by a transport piston and a perforated grid. The extrusion of the treated mixture in the form of a casting through a perforated grating with a diameter of 2-3 mm is carried out continuously at a pressure of 120 atm. . The strength of the compacted granules of the product increases by 1.5 times from 1 (11 kgf / cm to 15-30 kgf / cm. Using a static analysis, the distribution of the liquid component in the volume of the layer is estimated. Additives of moistened powdered material in an amount of 5–30% by weight loadable tiles, improves the rheological and physicochemical properties of the product, helps to reduce pressure and improves compaction performance, from 2 W / kg to 300 kg / h. Increasing the additive content of more than 30% is uneconomical and has little effect on the further sealing process. and product. Example: Previously, in a vertical biconical mixer such as RS-200, dry and wet mixing of bulk components and liquid additives of the mass of the positive electrode was carried out in an amount of 200 kg. A positive electrode sintering mixture was obtained, which consists of,%: manganese dioxide 72, graphite 1 , soot 3 industrial oil 2, electrolyte 12. The mixture has a bulk density of 1100 kg / m particle diameter of 100-150 microns, humidity of 8-8.5%. The resulting loose sintering mixture was fed in portions of 0.8-1.2 kg into a hopper of sealing rollers, in which the particles of the mixture were heated to 5P-70 ° C. Then the processed mixture was drawn into the gap between the rollers and compacted. At the exit of the rolls, tiles of product thickness were formed corresponding to the selected gap. The specific compressive force at a gap of 6 mm was kg / cm at a speed of rotation of the rolls of 10-20 rev / min. The crush strength of the mix tiles was kgf / cm. Next, the tiles of the pressed material were loaded into the chamber of the granulator housing compaction, in which the transporting piston pressed through the grid in the form of rods, which at the outlet broke off under their own weight. A loose agglomerate mixture was loaded into the compaction chamber of the granulator. The granulation pressure was 120-1 0 atm, productivity 250-300 kg / h. At the same time, the productivity of the process increased to 597 EO%, the strength of vozrool granules was 1.5 times and amounted to kgf / cm. The economic effect of the implementation of the invention is achieved by increasing productivity. Claims 1. A method of making granules from powdered materials, preferably agglomerate mixtures with the main component manganese dioxide. including pre-compaction, dosed amount of pre-moistened source material -. The ala and the subsequent final 3c compaction are characterized in that, in order to increase the productivity of the process and the quality of compaction, the starting material is heated to 50-70 ° C, and during pre-compaction a semi-finished product is obtained, giving the material the shape of tiles. 2. The method according to p. 1, l and h and rout and, and with the fact that before the final compaction the source material is added to the semi-finished product in an amount of (G) -СЙ)% by weight of the semi-finished product. Information sources taken into account during the examination 1. The patent of France, cl. In 29 About 7/1, published. 21.03.75 (prototype).