RU1787456C - Method of obtaining fire-extinguishing powder - Google Patents

Abstract

The invention relates to methods for producing fire extinguishing powder and allows to increase productivity, reduce energy consumption, eliminate inlaid equipment and improve the operational characteristics of the finished product. The method involves mixing phosphoric acid with sulfuric acid in a ratio of 1.56-5.86: 1, neutralizing with ammonia to obtain saline solutions with a concentration of 36-52% and a pH of 4.0-5.0, introducing a silicon-organic additive of aluminomethylsilox - sodium nitrate, dispersion and drying in a stream of heated air containing 0.02-5.0% carbon dioxide, at 140-150 ° C. The dried product is separated, followed by regrinding of the coarse fraction. The additive is introduced in an amount of 1-10% by weight of solids in solution. As heated air, flue gases are used. Energy consumption is reduced by 20%. The time of production of 1 ton of powder is reduced by 15-20%, the fluidity of the powder is 0, .1, the fire extinguishing ability is 0.55 s kg .. 2 cpf, 1 table. ate with

Description

The invention relates to methods for producing fire extinguishing powders for extinguishing fires of solid and gaseous substances (Class A, B, C fires), as well as energized equipment.

The aim of the invention is to increase productivity, reduce energy consumption, eliminate inlaid equipment and improve the performance of the finished product.

The invention is illustrated by the following examples.

Example 1. Saline solutions were prepared by mixing phosphoric acid (100% PaOs) with sulfuric acid (monohydrate) at a ratio of 5.86: 1 and neutralizing with ammonia to obtain saline solutions

with a concentration of 48% and a pH of 4.0. Then sodium aluminomethylsiloxanolate (Petrosil-2M) and a dye were added at a rate of 10% and 0.04%, respectively, based on the weight of solids in saline. Then, the prepared salt solution with additives was sprayed in a stream of flue gases containing 5% CO2 and dried at a temperature of 150 ° C. Received a blue staff with a bulk density of 900 hl. 1, which was then subjected to separation into two fractions. A fine less than 100 microns, the yield of which was 80%, was directed to mixing with. dispersed additives (Aerosil AM-1-300 and phlogopite) in an amount of 1.0-2.5% by weight of the active component. Coarse fraction larger than 100 μm under xl 00 ı

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Gali grinding followed by displacement with dispersed additives. In this example, energy consumption is reduced by 30%, the production time of 1 ton of powder is reduced by 20%, the fluidity of the powder is 0.26, and the fire extinguishing ability is 0-62:. ;

| Example 2. Saline solutions were prepared by mixing phosphoric acid (10% P203) with sulfuric acid (monohydrate) at a ratio of 2.5: 1 and neutralizing with ammonia to obtain saline solutions with a concentration of 50% and a pH of 4.5. After that, sodium aluminomethylsiloxanolate (Petrosil-2M) and a dye were added at a rate of 5% and 0.04%, respectively, based on the weight of solids in saline. Then, the prepared salt solution with additives was sprayed in a stream of flue gases containing 2% CO2 and dried at a temperature of 140 ° C. Received a blue gyuroshok with a bulk density of 920 g. which was then subjected to separation into two fractions. A fine less than 100 microns, the yield of which was 85%, was directed to mixing with dispersed additives (Aerosil AM-1-300 and phlogopite) in an amount of 1.0-2.5% by weight of the active component. A coarse fraction larger than 100 microns was grinded, followed by mixing with dispersed additives. Therefore, for example, the energy consumption was reduced by 20%, the production time of 1 ton of powder was reduced by 10%, the fluidity of the powder was 0.25, and the fire extinguishing ability was 0.55 kg

EXAMPLE 3 Saline solutions were prepared by mixing phosphoric acid (100% P205) and sulfuric acid (monohydrate) at a ratio of 1.58: 1 and neutralizing with ammonia to obtain saline solutions with a concentration of 52% and a pH of 5.0. After that, sodium aluminomethylsiloxanolate (Petrosil-2M) and dye were added at a rate of 1% and 0.04%, respectively, based on the weight of dry substances in saline. Then, the prepared salt solution with additives was sprayed in a flue gas stream containing 0.02% and dried at a temperature of 145 ° C. A blue powder with a bulk density of 960 gL was obtained, which was then subjected to separation into two fractions. Fine less than 100 microns, the yield of which was 80%, was directed to mixing with dispersed additives (Aerosil AM-1 300 and phlogopite) in an amount of 1.0-2.5% by weight of the active component. A large fraction larger than 100 μm was subjected to grinding, followed by mixing with dispersed additives. Therefore

For example, energy consumption was reduced by 20%, the production time of 1 ton of powder was reduced by, the fluidity of the powder was 0.25, and the fire extinguishing ability was 0.58 kg.

In the claimed method, the parameters of the process for producing fire extinguishing powder are limited for the following reasons. The lower limit of the concentration of salt solutions of 48% is based on the fact that, at lower values, they will decrease productivity and increase energy consumption; the upper limit is 52%, therefore, at higher values, crystals of salts precipitate which clog the communications. The ratio of phosphoric and sulfuric acids is determined by the fire extinguishing ability of the resulting mixture of ammonium phosphates and ammonium sulfate. Neutralization of acids is carried out to a pH of 4.0-5.0, since saline solutions below pH 4 consist mainly of mono-ammonium phosphate, which is inferior to diammonium phosphate in its fire-extinguishing ability. At pH above 5, ammonia is released before drying, therefore, the particles are loosened and the product is obtained with a low bulk density, which quickly dissolves and has a tendency to caking. A carbon dioxide content below 0.02% does not allow rapid curing of sodium aluminomethylsiloxanol and a carbon dioxide content above 5.0% is not economically feasible. A content of sodium aluminomethylsiloxanolate of less than 1% in the salt mixture leads to inlaid equipment and increased agglomeration of powder particles, and exceeding the concentrate above 10% does not improve the quality of the powder, but only increases the cost of the powder.

The drying temperature is 140-150 ° C and the presence of carbon dioxide ensures the complete conversion of liquid sodium aluminomethylsiloxanolate to a polymer. In addition, salts will be deeply dried up to 0.1% moisture, and at 135 ° C the humidity of the salts can be 0.5%, which negatively affects the safety of the extinguishing powder. Drying at temperatures above 150 ° C is impractical due to the decomposition of monoammonium phosphate. The table provides comparative data of known composition and those claimed in Example 1-4.

The use of carbon dioxide flue gas helps protect the environment.

Claims (3)

SUMMARY OF THE INVENTION 1. A method of producing a fire extinguishing powder, comprising neutralizing phosphoric acid with ammonia, introducing an organosilicon additive, dispersing, drying in a stream of heated air and mixing with dispersed additives, characterized in that, in order to increase productivity, reduce energy consumption, eliminate incr - Station equipment and improve the operational characteristics of the finished product, phosphoric acid is pre-mixed with sulfuric acid at a ratio of phosphoric acid (100% P 20b) and sulfuric (monohydrate) 1.58-5.86: 1, neutralization is carried out to obtain saline solutions with a concentration of 36-52% and a pH of 4.0-5.0; sodium aluminomethylsiloxanolate of the general formula is used as an organosilicon additive Hsn3 hsn3 (NdO-Si-0) Al (0-SbON x) 3, ohm Chi where n is 0-2, drying is carried out in a stream of heated air containing 0.02-5.0% carbon dioxide at 140-150 ° C, the dried product is separated, followed by regrinding of the coarse fraction. 2. The method according to claim 1, characterized in that the organosilicon additive is introduced in an amount of 1-10% by weight of dry matter in solution. 3. The method of pop. 1, characterized in that flue gases are used as heated air.