SU1680765A1 - Process for preparing molded coke reducing agent - Google Patents

Abstract

This invention relates to a technology for producing a coke briquetted reducing agent used in electrothermal phosphorus smelting with the aim of increasing the strength of the reducing agent and reducing volatile substances in it. To achieve the goal, the coke breeze is divided into fractions — 0.5 mm, which is mixed with sulphite-alcohol stillage concentrate in a liquid state, and not a fraction + 0.5 mm, which is mixed with a liquid petroleum bitumen; both mixtures are mixed, molded in briquettes and heat treated. 1 tab.

Description

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This invention relates to a briquette coke reductant technology used in electrothermal phosphorus smelting.

The purpose of the invention is to increase the strength of the reducing agent and reduce volatiles in it. Example. For carrying out the process, coke breeze is used, which is a waste from the crushing of coke from phosphate production, which is characterized by the following data:

The number of fractions of 0.5mm, May.% 45

Specific weight, g / cm31.2-1.3

Breaking strength, kgf / cm2130-170

Resistivity, Ohm.cm2-3

Ash content,% 12,6-13.6

Volatile% 1.5-2

g-er,% 0.6-0.8

Carbon% 84

65/40 oil bitumen is used as a hydrocarbon binder. The concentration of sulfite-alcohol stillage of the mark PRS-A according to OST 13-183-83 is a 50% solution in water with a density of 1.232 g / cm. 100 kg of coke breeze are dispersed on a sieve with a mesh size of 0.5 mm. Fraction yield - 0.5 mm 45 kg. fractions + 0.5 - 55 kg. The oversize product (+0.5 mm) is mixed with 2.2 kg (3-4 wt.%) Of petroleum bitumen, previously heated to 90-95 ° C for 10-15 minutes. The undersize product (-0.5 mm) is mixed with PRS concentrate in the amount of 2.7 kg (5-6%) heated to 60 ° C, to which a polyphenolic viscosity reducer can be added. Then both mixtures are combined and stirred for 10-12 minutes. When this mixture cools to 45-50 ° C. At such a temperature of 00 O

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The mixture is fed to a roller press with an average force of up to 200 kg / cm2. The resulting briquettes are cooled on a conveyor belt to room temperature (24 ° C). Pillow-shaped briquettes of 55x50x30 mm in size are obtained; the width of the clear edge is no more than 4 mm. After being stored in the warehouse (4-6 days for curing), the briquettes are transferred to heat treatment, which is carried out in a shaft furnace with a heating rate of 2-3 K / min. Heat treatment is carried out at 500-550 ° C for 20-30 minutes with limited access of oxygen. The resulting briquettes are characterized by the following indicators: Density, g / cm3 1.25 Bulk density, g / cm3 0.6 Ash,% .12-13

Porosity,% 35 Compressive strength (GOST 212 89-75), M P a105

Impact strength (GOST 21289-75),% 92

The content of volatile,% 1,5-1,7

CO reactivity (GOST 10089-73), mg / g-s1,5-1,7

Additional experiments on the separation of the fraction - 0.25 and +0.25 mm, +0.4 and

-0.4 mm, -0.8 and 0.8 mm showed optimal separation of coke breeze fractions by -0.5 and +0.5 mm.

The table shows the data on the strength and content of volatiles obtained by the proposed and known methods.

Thus, from the above data it follows that the proposed method produces briquettes based on coke breeze, which are higher in strength and lower in volatile content compared to the known method.

Claims (1)

Invention Formula A method for producing a coke molded reducing agent, comprising separating coke breeze into fractions, separately mixing each fraction with a carbon-containing binder in a liquid state, then mixing them, molding the mixture and heat treating the moldings, characterized in that, in order to increase the strength of the reducing agent and reduce its content of volatile substances, coke breeze is divided into a fraction of -0.5 mm, which is mixed with a concentrate of sulfite-alcohol bards, and a fraction of + 0.5 mm, which is mixed with an oil bitumen bond. them.