SU1546469A1 - Method of producing fuel bricks - Google Patents

Abstract

This invention relates to a technology for carbon-containing solid fuels, in particular, to a method for producing fuel briquettes that can be used in a foundry industry for cupola-smelting iron. In order to increase thermal strength and yield of fuel briquettes, sawdust is added to the mixture of crushed anthracite and coke breeze, mixed with liquid glass, then with oil bitumen heated to 220-250 ° C, in the following ratio, wt.%: coke breeze 34-36

wood sawdust 1,5-2,5

liquid glass 6.5-7.4

petroleum bitumen 2.5-4.5 and anthracite fines — the rest, process the mixture with superheated steam to 60–70 ° C, cool the mixture to 45–50 ° C, and preform on a roller press at 20–25 MPa. 1 tab.

Description

This invention relates to the technology of solid carbon-containing fuels, in particular, to a method for producing fuel briquettes that can be used in foundry in cupola smelting of iron.

The purpose of the invention is to increase the thermal strength and yield of fuel briquettes.

Primer p. The main components of the charge - anthracite fines (coke) and coke breeze, previously crushed in a hammer mill to a particle size of 0-6 mm and dried to a moisture content of 1-3%, are mixed in a horizontal batch mixer. Sawdust (GOST 18320-78 with a moisture content of 1% and a particle size of 0-3 mm) is also added to the mixture and mixed. In the mixture prepared in this way after the introduction of liquid glass (GOST 13078-81) with a temperature of 20 ° C, which has a silicate module 2.6 and density, 1.49 g / cm, and mixing is supplied in a liquid state through hot nozzle bitumen BN 70/30 (GOST 6617-76) spray nozzles with a heating temperature of 230 ° C. Then heated until homogeneous state neither mixture

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loaded into malakser, where it is further mixed and steamed with hot water with a temperature of 210 ° C to heat up to 65 + 5 ° C, after which the mixture is cooled in screw conveyors to 5-50 ° C and fed to a roller briquetting press pressing 20 MPa.

The briquettes made are pillow shaped (length 70 mm, width 50 mm, height 35 mm).

Determination of the properties of briquettes was carried out 2 hours after production. In the table presents the specific composition of the mixture (experiments 1-10) and the characteristics of the briquettes obtained by the proposed method in comparison with the prototype (experiment 11).

Thermal strength was determined by the resistance of the breaking load to a point compression after heating the briquettes to 200 ° C. The water resistance of the briquettes was evaluated by the amount of moisture absorbed (in%) after 2 hours in water.

The data in the table confirm that the proposed composition of the charge and the sequence of input of the binders provide fuel briquettes with higher thermal strength and yield than the prototype.

The process of briquetting according to the technology proposed in the invention, besides increasing thermal strength and the yield of suitable briquettes, also allows reducing the consumption of liquid glass.

The initial introduction of liquid glass into the mixture, which covers the pores of cocoa fines and anthracite shafts and provides a uniform surface layer, makes it possible to significantly increase the thermal strength of briquettes. With the introduction of less than 6.5 May. % of liquid glass briquettes have low thermal strength, and with the introduction of its more wt.% there is a decrease in the water resistance of briquettes and an increase in their cost. The introduction of sawdust provides the elasticity of the charge and an increase in the yield of briquettes from the molding channel during pressing. Their lower content does not provide an exit a year.

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and more leads to a decrease in thermal strength.

Inclusion in the briquettes ant-j. Ratsitovogo shtyb allows by reducing the microporosity of the mixture to provide high thermal strength and yield of briquettes while reducing the consumption of liquid glass. The introduction of a smaller amount of anthracite shtab into the mixture is not effective, since it does not ensure a high yield of briquettes, and a greater amount leads to a significant decrease in the calorific value of briquettes due to an increase in their ash content due to a somewhat higher

total SiOz content in anthracite shtyb.

The use of fuel briquettes according to the proposed method in the cupola smelting of cast iron allows saving about 10 deficient foundry coke (GOST) without deteriorating the quality of the smelted metal.

Claims (1)

Invention Formula A method of producing fuel briquettes, comprising mixing crushed carbon material with heated oil bitumen and liquid glass, treating the mixture with superheated water vapor and subsequent briquetting the mixture, characterized in that, in order to increase thermal strength and yield of suitable briquettes, as a carbon material a mixture of anthracite and coke breeze is used, sawdust is added to it, mixed with liquid glass, and then with oil bitumen, and these components are taken in the following ratios and x, May. % Koksova 0 a trifle Sawdust Liquid art & K oil Neft bitumen 1.5-2.5 6.5-7, 2.5-3.5 Else