SU1688979A1 - Method of preparing powder material charge - Google Patents

Description

(21) 4657557/02 (22) 03/01/89 {46) 11/07/91. Bul №41 (72) V.N. Babain (53) 621.762.3 (088.8)

(56) RZh Metallurgi, 1971, No. 10, 10G412. RZh Metallurgi, 1975. № 8, 8Г600.

(54) METHOD FOR OBTAINING CHARGE FROM POWDER MATERIALS

(57) The invention relates to powder metallurgy, in particular to the production of ferrites, and can be used in the manufacture of various ceramics. The aim of the invention is to simplify the process while ensuring high yield

granulated product. A ferrite grade student mix is produced by dry mixing for 15-45 minutes. After the dry mixing is finished, a liquid binder (5 g / a solution of polyvinyl alcohol) is fed into the working tank. After the granules are formed, they are dried by supplying compressed air or blowing A granulator to a granule moisture content of not more than 6%. The method allows to obtain a mixture with a higher bulk density with a lower content of fine fractions and at the same time simplify the process by reducing the processing time. A decrease in the content of fines leads to an increase in yield. 1 z.p, f-ly. 2 tons angry

The invention relates to powder metallurgy, in particular to the production of ferrites, and can be used in the manufacture of various ceramics.

The aim of the invention is to simplify the process while ensuring a high yield of granulated product.

In order to obtain fippers intended for the preparation of ferrites for firing, an apparatus consisting of a working chamber, a crumb, a paddle stirrer and a splitting head, equipped with individual drives of a screw device for lifting and firing of the working chamber, is used. To fill the chamber of the apparatus with powder material (1/2 of the chamber volume), it is sealed with a gasket located between the lid and the chamber. To obtain the required uniformity of mixing the components, the process is carried out for 15-45 minutes.

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After the end of the dry mixing, a liquid binder is fed into the working container for 2-3 minutes. Under agitation in the presence of a binder, ejection of dense granules having a shape with a minimum number of fine fractions occurs, the average grain size is in the order of 1-2 mm. With intensive mechanical mixing of the powder and granulated material, the mixture is heated to 50-70 ° C, which contributes to the release of parsw., The mixing process after granule formation is continued for minutes, and rpSHVi is dried by supplying compressed air and suction of the vapor generated by the fan to a moisture content of not more than 6%, with which no formation and caking of psi storage granules and tpg distribution are observed. After drying, grinuli L.uiUf-a; the product is discharged from the t ampere and

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sent for roasting. The grinding of powders after firing is carried out in vibratory mills. At the same time, no significant adjustment of grinding conditions is required.

Example 1. The working chamber of a paddle-torch mixer is loaded with 15 kg of charge grade ZC418 after weighing the initial components in a given ratio.

The components are dry blended for 30 minutes. The stirrer speed is 300 rpm and the rotational speed of the grinding head is 2000 rpm. At the end of mixing, the mixture is poured over 2 minutes for 2 liters of a 5% aqueous solution of polyvinyl alcohol and, continuing the mixing, purge the working chamber with compressed air to remove water vapor for 8 minutes. After drying, the granulated product is discharged from the chamber.

The density of the obtained granules, determined by measuring the diameter of the granules and weighing, is 3.3 g / cm3, which corresponds to the density of briquettes pressed at a pressure of 1 TH / em2 (2.8-3.28 g / cm, i.e. high enough for granulated product.

Example 2. A 10 kg batch of 6С41 grade charge was loaded into the working chamber of a paddle mixer –granulator, and the blend was dry mixed for 30 min in modes similar to Example 1. After the mixing was completed, 2 l of a 5% polyvinyl alcohol solution was injected. and lead

drying of granulated mixture by blowing with compressed air for 10 minutes.

The results of the analysis of the particle size distribution and bulk density of the granulated mixture obtained by the proposed method are listed in Table 1.

Data on the processing modes of the charge are presented in table 2.

The material obtained by the proposed method has a higher bulk density, a smaller content of fine fractions, and the duration of the process for preparing the charge is reduced by a factor of 2–3.

F o rma l a and s h

Claims (2)

1. A method of obtaining a mixture of powder materials, mainly for preparing ferrites for roasting, including mixing the components of the mixture in an apparatus with mixing and crushing bodies, introducing a liquid binder, granulating and drying the granules, in order to simplify the process high output suitable granulated product, mixing, granulating and drying are carried out in one apparatus, the components of the mixture are dry blended for 15- 45 minutes, then grease is introduced for 2-3 min, and drying the granules is carried out to a moisture content of not more than 6%. 2. A method according to claim 1, characterized in that the drying is carried out by a stream of compressed air or suction of steam by a fan when mixing granules. Table 1