RU2001955C1 - Method of treatment of melted slag - Google Patents

Abstract

The invention relates to ferrous metallurgy and can be used in blast furnace and steelmaking. SUBSTANCE: method for processing slag melt, including its enrichment with additives by granulation in a slurry navel, in which slag melt is first poured onto an inclined chute, to which lime is fed to the slag in an amount of 50-100 kg / t of slag, the flow rate and density of slurry pulp being maintained in the range of 3000-5000 kg / t of slag and 12-1.3 g / cm3

Description

The invention relates to ferrous metallurgy and can be applied in blast furnace and steelmaking.

It is known that slags and slurries of metallurgical production contain useful oxides and can be used as charge materials in metallurgy, as well as in the cement industry. Before use, they are pretreated using various technologies of Ievesten, for example, a method for treating slag by pouring it into a special trench layer by layer and then watering it in an amount of 0.3-1.2 m3 of the treated surface for 4-8 hours. After a certain fraction of the slag is screened for cooling for later use.

There is also known a method of processing steelmaking slag, which comprises supplying limestone to liquid slag in an amount of 20-25% of its weight, and then iron and manganese carbonates (see USSR Autonomy No. 574949).

Known techniques for the preparation of metallurgical raw materials by pelletizing iron-containing sludge, providing for their dehydration on various devices and subsequent mixing with dry dusty waste from metallurgical processes. The described methods are carried out with high capital costs for the drying of sludge, as well as for the preparation and introduction of iron and manganese carbonates into the slag.

The closest technical solution is a method for the joint processing of slag and iron-containing waste, which consists in feeding 50-70% of the mass of slag of various additives and their joint agglomeration.

However, the practical application of the known method proves that with such a ratio of additives to the slag, the latter already becomes viscous at a temperature of 1430 1450 ° C, as a result of which some of the additives will not have time to mix and evenly distribute in the slag mass.

The aim of the invention is to improve the metallurgical properties of slag as a charge material and to increase the efficiency of the enrichment process.

The goal is achieved in that in a method for processing slag melt, including enriching it with additives by granulation in a slurry pulp, the slag melt is first poured onto an inclined trough, to which 50-100 kg / t of slag is known under a stream of slag.

moreover, the amount and density of slurry pulp is maintained within 3000-5000 kg / t of slag and 1.2-1.3 g / cm3, respectively.

The proposed method of processing slag is implemented as follows.

The liquid slag is poured evenly into the accumulated troughs, to which fine limestone is supplied in an amount of 70 kg / t of slag. Under the influence of the temperature of the slag melt, limestone is enriched with the release of carbon dioxide (CO2), which contributes to the gas saturation of the slag and creates favorable conditions for its subsequent dispersion. The dimensions of the receiving chute and its slope correspond to the chutes used on existing standard granular units. The gas-saturated mass of liquid slag from the gutters enters the tanks, which are pre-filled with slurry pulp with a solution density of 1.3 kg / cm3. The containers are in the form of a granbasin, the dimensions of which should allow the amount of slurry pulp to be accommodated at the rate of 5999 kg / t of slag to be drained. Interacting with the pulp, the slag disperses into granules, while being saturated with useful oxides contained in it. In this case, the granules have a porous solidified shape, the pores of which are filled with sintered iron-containing sludge. After evaporation of the residual moisture from the tank due to the heat content of the granules, the latter are loaded onto the wagons or hoppers with a grab and sent to the consumer. Before the next slag discharge, slurry pulp is pumped into the tank and the process is repeated. By its properties, the obtained product can be used as a mixture for sintering production and preparation of high-strength cement.

The implementation of the proposed method for processing slag melts will provide the following advantages in comparison with existing methods. .

The combination of features proposed by the applicant makes it possible:

. To obtain a granular product from slag with improved properties for use both in metallurgy and in the production of Portland cement.

2. It is known to save iron-containing charge in the metallurgical redistribution, and in the cement industry, it is known to contain components and pyrite cinder.

3. To utilize the heat of slag melt during the joint sintering of components of the slurry pulp with its simultaneous drying.

4. Improve the ecological state (56) USSR copyright certificate

environment as a result of exclusive No. 713919, cl. With 22V 1/24. 1977.

nor the need for storage of sludge-Patent NDP No. 80509, cl. From 21 to 5/08,

howling pulp in dehydrated maps. 1973.

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Claims (1)

SUMMARY OF THE INVENTION METHOD FOR PROCESSING SLAG Sloping trough on which under the stream MELT including granulation of slag serves known to a quantity of 50 slurry pulp, characterized in that. that. 10, 10 ° g, with flow rate and density in order to improve the metallurgical sludge pulp, in the preconditions of the product and to increase the effec- tive level of LWh, 3,000–5,000 kg / t of slag and 1.2–1.3 g / cm are supported the process of slag enrichment, slag, respectively.