SU1706987A1 - Method of producing crushed stone from disintegrating steelmaking slags - Google Patents

Abstract

The invention relates to the production of rubble from decomposing steelmaking slags. The purpose of the invention is to improve the quality of rubble. The method includes processing of slag with a temperature of at least 600 ° C with water for 15–20 minutes with a specific consumption of the last 0.20–0.25 m / h, followed by exposure for 2.5–3.0 hours. Stability of the structure of crushed stone (mass rub) up to 7%. 1 tab.

Description

The invention relates to metallurgy and can be used in the production of unsorted crushed stone from metallurgical slag from the current output.

There is a known method of making rubble from steelmaking slags by molding them from a tank into a trench with water and subsequent crushing.

However, in the case of the slag processing method, large costs are required for slag casting, thermostating, and cooling.

Also known is the method of heat treatment of converter slags of the current output. Heat treatment of high-temperature slag according to the developed method is carried out by irrigation with water in special trenches with a frequency of 4-6 h / m2 and with intervals between fillings 18-20 h.

This method requires special trenches and other equipment, as well as high energy consumption.

The closest to the proposed invention to the technical essence is the method of obtaining rubble from metallurgical slags by pre-crushing, averaging its temperature in

heat-insulating capacity and exposure to water for 1.5 2.5 h.

The implementation of this method under the conditions of existing slag yards requires the presence of special sections and equipment for crushing, overloading, thermostating, and cooling the slag. All this leads to additional labor and energy costs and congestion of slag yards, which reduces their throughput. In addition, the operation of holding the slag in water for 1.5-2.5 hours is not optimal, since the process of stabilizing its structure in this time interval is not yet completed.

The purpose of the proposed method is to improve the quality of rubble.

The goal is achieved by those. that in the method of production of rubble from steelmaking slags by loading the slag into a heat-insulated tank and cooling it with water, in the same tank, processing of slag is performed alternately with water at a specific flow rate of 0.20 0.25 m VT n for

00

with

Xi

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but about with

15-20 min, then kept in water in the optimal mode for 2.5 - 3.0 hours

A comparative analysis of the proposed invention with the prototype shows that the optimal mode of heat treatment of the slag is determined by the technological process and depends on the slag temperature, specific consumption and processing time. It is the claimed specific water consumption of 0.20–0.25 m3 / t for 15–20 minutes and the subsequent exposure of the slag to water for 2.5–3.0 hours to achieve the objective of the invention.

Comparative test data for various modes of the process are shown in the table.

Example. The slag edged into the slag yard after pre-crushing to pieces of not more than 500 mm and the subsequent removal of scrap metal from it is immediately reloaded with a grab into heat-insulated containers installed on the side opposite to the slag discharge.

Reservoirs of slag carriages can be used as tanks, the outer or inner walls of which can be covered with thermal insulation.

Slag with a temperature of at least 600 ° C is loaded into bowls up to the level of 200–250 mm from the upper edge, treated with water at a specific flow rate of 0.20–0.25 m3 / t for 15–20 min, then slag in a bowl with

water soak optimally for 2.5 - 3.0 hours

Thereafter, the resulting rubble is extruded onto an inclined platform for dewatering and additional separation in order to select metal crowns.

Before shipment to the consumer, it is advisable to disperse the rubble into fractions.

Thus, the application of the proposed method of crushed stone production will allow:

- to improve the quality of rubble produced;

- minimize labor costs and time spent on slag processing by eliminating auxiliary operations for slag handling and optimization of process parameters;

- to increase the capacity of the slag yard due to the direct shipment of slag to the heat-insulated bowls.

Claims (1)

The Invention Method for the production of rubble from decaying steelmaking slag by loading slag with a temperature of at least 600 ° C into a heat-insulating tank and cooling it with water, characterized in that, in order to improve the quality of rubble, slag is treated with water for 15 - 20 min with a specific consumption of 0.20 - 0.25 m / h, followed by exposure for 2.5 - 3.0 h.