SU638624A1 - Briquette production method - Google Patents

Description

I

The invention relates to the agglomeration of powdered raw materials and can be used in the allurgic and chemical industry.

In order to intensify the processes of briquetting and pelletizing, to increase the strength of the product, binder additives, in particular, coal and oil pitch, are introduced into the mixture.

However, the use of these substances is limited due to their carcinogenic properties.

The closest to the invention in technical terms and attainable rezuly-atu is the method of briquetting using the coal tar pitch l as a binder.

The method involves mixing of iron ore metallized concentrate of coarseness - O, O74 mm, containing 73.7% of iron, with coal tar & amount of 4-8% (by weight) heating of Ishkhta to 9О-1ОО С, pressing at a pressure of 20О-800 kgf / cm and drying of briquettes at a temperature of 2OO-250 С for 30 min. The mixing operation with simultaneous grinding of the pitch was carried out at a B mill of 15-2 O min in a ball mill without moistening the material. The output of briquettes of class +5 mm after a 10-fold drop from a height of 1.5 m was 9O-91.5%.

The disadvantages of this method are the use as a binder coal tar pitch with carcinogenic properties harmful to human health, as well as the complete insolubility of the binder used in water, which makes it evenly distributed in the mixture.

The purpose of the invention is to improve the sanitary working conditions, increase the strength of briquettes, simplify and reduce the cost of technology,

Claims (1)

This is achieved by moistening the mixture before briquetting with a solution of saponified tall pitch, and the briquettes are dried at 14 ° 16O ° C. Talp pitch represents a tall residue from the rectification of tall oil. Group, composition of tall pitch {%): non-saponified substances - 33, oxidized substances - 14, resin acids12 ferrous acid - 39. For saponification, pitch is treated with caustic soda: -Magnetic, Kachkanarsky and Apatite concentrates. At the same time, the concentrate was moistened with a 25% -. Aqueous solution of rich tall pitch, the briquettes were dried for an average of 150 ° C. Experimental data show that when added to concentrates, 1-2% of their weight of rich tall pitch is obtained by briquettes, whose strength exceeds the strength of briquettes with a 6% addition of coal tar pitch: at 10 to 5 times drop from a height of 1.5 m, the content of the class is +5 mm in all tested cases above 95% instead of 9091, 5%. The method for producing briquettes from powdered materials, including wetting, mixing with a binder, pressing the mixture and drying the briquettes, characterized in that, in order to improve sanitary working conditions, increase the strength of the briquettes, simplify and reduce the cost of technology, use as a binder the solution of saponified tall oil pitch and drying of briquettes is carried out at a temperature of 140-160 ° C. Sources of information taken into account in the examination: 1. Ravich B. M. Briquetting in ferrous and non-ferrous metallurgy. M., Metallurgists, 1975, p. 1OO.