RU2417112C1 - Fire extinguishing dry compound and method for making thereof - Google Patents

Abstract

FIELD: fire-fighting technology.

SUBSTANCE: fire extinguishing dry compound is intended for fire extinguishing. As an essential fire extinguishing ingredient, the compound contains a mixture of sodium bicarbonate and natural mineral halite in the weight proportion 1:5 respectively, preferentially 1:3. A method for producing the compound involves halite grinding separately from the other ingredients to grain size composition.

EFFECT: low corrosion activity as compared to steel, lower residue content in a fire extinguisher, lower powder moisture absorption with high efficiency of fire extinguishing, industrial applicability, product cost saving.

4 cl, 1 tbl, 3 ex

Description

The invention relates to compositions and methods for producing fire extinguishing powders. which can be used to extinguish fires, class A, B, C and electrical installations under voltage up to 1000 V.

The known composition of the powder for extinguishing fires, including 2-10 wt.%, Hydrophobic additives and the rest sylvinite (ed. St. USSR No. 558677). The disadvantage of the composition is the use of expensive modified aerosil AM-1-300 in significant quantities (up to 10%), low technological compatibility of the joint grinding of wet sylvinite and aerosil, as well as high corrosion characteristics.

Known powder for extinguishing fires (patent RU 2259220 C), including waste edible salt with a particle size of 0.2 mm in an amount of 90 to 95% and hydrophobized porous silicate in an amount of 5-10%. As a water repellent agent, a 3-8% solution of methyltrichlorosilane in toluene is used.

The disadvantage of the composition is the high toxicity of the water repellent, high corrosivity of salt and low fire extinguishing ability.

Closest to the claimed invention is a powder composition and method for its preparation (patent RU 2143297 C1) containing, wt.%:

- a highly dispersed additive of 0.8-3.5;

- target additive for fluidity 8-35,0;

- hydrophobic organosilicon liquid 0.008-0.28;

- the main component is the rest.

At least one compound from the series is proposed as the main component: potassium chloride, sodium chloride, ammophos, sylvinite, sulfate, alkaline or alkaline earth metal phosphate, sodium bicarbonate, monoammonium phosphate, diammonium phosphate, ammonium sulfate.

The specified patent RU 2143297 C1 lists numerous components for formulating fire extinguishing powders, but neither the formula, nor the description, nor the examples indicate specific parameters for the use of all these components, which reduces the practical feasibility of using this invention. So sodium bicarbonate is incompatible in the composition of fire extinguishing powders with ammonium phosphates.

The objective of the invention is to provide an easily applicable industry method for producing a fire extinguishing powder composition having high consumer characteristics: reduced moisture absorption and the remainder of the powder in the fire extinguisher, low corrosion activity and at the same time low cost of the product.

The problem is solved in the present invention by using the natural mineral Halite, in particular the mineral concentrate Halite TU 2111-004-00352851-05 mixed with sodium bicarbonate in a ratio of 3: 1 as the main component of the fire extinguishing powder composition.

The natural mineral Halite has several advantages over synthetic sodium chloride: less corrosiveness, humidity, cost.

As a finely dispersed additive, a hydrophobizing mixture of white carbon black brand BS 100-120 with microtalc is used in a ratio of 1: (0.1-2).

A mixture of limestone flour and talc magnesite in a ratio of 1: 3 is used as the target additive for fluidity. When the ratio of highly dispersed hydrophobized additives to the target additive for fluidity (0.5-3) :( 30-65), the main component is the rest.

The invention is carried out in the following way.

Mineral concentrate - Halite with a particle size of 1.2 mm to 20 mm - is crushed separately from other components in a ball mill to a particle size under mesh No. 105 - at least 40%, dried in a tumble dryer at a temperature of 75-80 ° C for 30-40 minutes to a moisture content of not more than 0.25%.

The prepared mineral concentrate - Halite - is sent to a mixing apparatus, for example, to a screw mixer, where it is subsequently mixed with other components: sodium bicarbonate, a highly dispersed hydrophobized additive (a mixture of white soot and microtalc), a targeted fluidity additive (limestone flour and talc magnesite) . After mixing and carrying out the relevant analyzes, the finished product is unloaded and packaged. The resulting fire extinguishing powder composition contains components in the following ratio, wt.%:

- highly dispersed hydrophobized additive of 0.5-3;

- target additive for fluidity 30-65;

- the main component is up to 100.

Specific examples of the use of powder are given in the table.

This invention allows: to reduce corrosion activity, the remainder of the powder in the fire extinguisher, the moisture content of the powder and the cost of the product. The invention is easily applicable in an industrial environment.

Literature

1. Auth. St. USSR No. 558677.

2. Patent RU No. 22259220.

3. Patent RU No. 2143297.

4. TU 2111-004-00352851-05. Mineral Concentrate Halite.

Claims (4)

1. Fire extinguishing powder composition, including highly dispersed hydrophobized additive, target additive for fluidity and the main fire extinguishing component, characterized in that it contains as a main fire extinguishing component a mixture of sodium bicarbonate and mineral concentrate - Halite, with a particle size of 1.2 mm to 18 mm , with a weight ratio of respectively 1: 5, mainly 1: 3, with a moisture content of not more than 0.35 wt.%, with the following ratio of components of the extinguishing agent, wt.%:
highly dispersed hydrophobized additive 0.5-3;
target additive for fluidity 30-65;
main component up to 100%. 2. The composition according to claim 1, characterized in that as a highly dispersed hydrophobized additives, a mixture of white soot and microtalc is used. 3. The composition according to claim 1, characterized in that as the target additives use limestone flour and talc magnesite in a ratio of 1: 3. 4. The method of obtaining a fire extinguishing powder composition according to claim 1, which consists in the fact that the mineral concentrate - Halite - is crushed separately from other components, characterized in that it provides a mass fraction of the powder of at least 40% and at the same time carry out drying to a moisture content of not more than 0, 25%