CS236623B1 - Method of liquid application on a surface of particles of loose material - Google Patents

Abstract

An invention falling within the chemical field technology solves the way of liquid application on the surface of particulate particles. The essence of the present invention resides in that the disintegrated material, such as sawdust, fine chippings, dust, fibers, chips, cutter granules, are electrically charged and mixed with electrically opposite charged aerosol liquid. It will ensure the action of the electric forces homogeneously covering the crushed surface the reagent.

Description

(54) A method of applying liquids to the surface of particles of bulk material

I

The invention in the field of chemical technology solves the method of applying liquids to the surface of particles of bulk material.

The essence of the method of the invention is that the disintegrated material, such as sawdust, fine debris, dust, fibers, chips, chopper, granules, is electrically charged and mixed with an electrically opposite charged aerosol of liquid.

The application of electric field forces ensures homogeneous coverage of the crushed material surface with the reagent.

The invention relates to a method of applying liquids to the surface of particles of bulk material.

Reagents, such as hydrolyzing agents, need to be uniformly applied to the surface of the reacting particles, mainly from the water, to ensure desirable reaction progress and low reagent consumption for this purpose. There are technological processes where it is necessary to apply a small amount of the reagent to the surface of the solid particles, as is the case with the hydrolysis of wood and agricultural waste with the small amounts of sulfuric acid described in USSR AO no. 391 140, 259 904, in the manufacture of particle board without the addition of organic adhesives, described in U.S. Pat. AO (PV 8308-82), when it is treated with sulfuric acid on wood chips. For this purpose, the reagents are sprayed with nozzles, but the distribution of the reagent over the surface of the material is only random and the spray liquid also impacts the reactor walls. Another method of applying additives is not described.

The above drawbacks are eliminated in the method of applying liquids to the surface of particulate material according to the invention, which is characterized in that the bulk material, such as sawdust, fine debris, dust, fibers, chips, mowers, granules and the like is electrically charged, e.g. discharge, in a strong electric field, by contact with the charged surface also in the fluidized bed, by the action of ionized gas, or an electrically charged aerosol, by electrification by friction, and mixed with an electrically opposite charged aerosol of the liquid. For this purpose, the reagent is dispersed and simultaneously or subsequently electrically charged, for example in a corona discharge, by electrostatic spraying, or by mixing with ionized gas.

An advantage of the method according to the invention is that a rectified flow of the electrically charged aerosol reagent is achieved on the surface of opposite electrically charged particles of disintegrated material under the influence of electric field forces. Thus, by using the same amount of reagent, a higher efficacy in the subsequent reaction is achieved, which makes it possible to reduce the consumption of reagents at the same or higher final effect. A further advantage is that the method according to the invention can be used in wide applications wherever it is necessary to evenly apply liquid to the surface of solid particles.

The object of the invention is demonstrated on the following examples:

Example 1

100 g of beech wood sawdust are mixed with an electrically charged sulfuric acid aerosol. 20 ml of 70 wt. sulfuric acid. The mixture is processed on a screw at 115 ° C. The mixture prepared by adding sulfuric acid of the same amount and concentration was also processed by the traditional spraying process. Hydrolysis of sawdust to which acid was added in a traditional manner yielded a yield of 35 percent reducing agents, while a hydrolysis of the composition prepared according to the invention yielded a yield of 47% reducing agents. Example 2 kg of wood chips with a moisture content of 50% by weight were mixed with 50 ml of 96% by weight in a negative corona discharge. sulfuric acid in the form of a positively charged aerosol obtained in a rotating cap electrostatic sprayer. The sawdust treated in this way was used to form the particle board by pressing at a pressure of 1 MPa, a temperature of 180 ° C and a pressing time of 4 min. The produced thatch exhibited the same or better mechanical properties than that which used 75 ml of 96 percent by weight per 1 kg of chips. sulfuric acid admixed in the traditional manner by means of a nozzle. Example 3

The butadiene-styrene rubber-based rubber pulp obtained by the disintegration of used tires is electrically charged by contacting an electrode at a high negative potential and is mixed with an electrically opposed charged styrene aerosol in a weight ratio of the order of 0.1 to 1%. Bumpers, hoses and other rubber articles of suitable mechanical properties can be produced by molding or processing the mixture thus prepared on an extruder.

Example 4

The granulated mineral fertilizer is electrically charged upon contact with an electrode at a high negative potential and the opposite electrically charged paraffin aerosol is sprayed onto its surface. The homogeneous coating of the surface of the mineral fertilizer granules with paraffin ensures their slow and uniform dissolution in the soil.

Claims (1)

SUBJECT A method of applying liquids to the surface of particles of bulk material, characterized in that the bulk material, such as sawdust, fine debris, dust, fibers, chips, mowers, granules and the like, is electrically charged in, for example, a corona discharge, strong electric field, OF THE INVENTION by contacting the charged surface also in the fluidized bed, by electrification by friction, by ionizing gas, or by an electrically charged aerosol, and mixed with an opposite electrically charged liquid aerosol.