SU1399363A1 - Method of sintering roasting of ores and concentrates - Google Patents

Abstract

The invention relates to the field of metallurgy and can be used to obtain agglomerate by sintering calcining ores and concentrates in a filter bed. The purpose of the invention is to increase the productivity of the process. The invention is carried out as follows. The sulfide charge is loaded into the agglobe and ignited from the surface with a gas burner when air is filtered through the charge layer. The air filtration rate is 2 m / min, the burning temperature is 1230 K, the burning time is 1 min. After that, the forced passage of air through the bed is interrupted for 0.25-0.7 minutes, after which the passage of air through the bed at a speed of 25 m / min is resumed until the burning process is completed at a temperature of 673 K. Table 1. i (/ С

Description

The invention relates to metallurgy and can be used in the preparation of agglomerate by burning ores and concentrates in a filter bed.

The purpose of the invention is to increase the productivity of the process.

The method is carried out as follows.

Lead sulphide mixture containing 7.69% of sulfur is sintering using the method of pumping air through the layer. The mixture is loaded into the aglochash and ignited from the surface with a gas torch. The ignition is carried out at an air filtration rate through a layer of material 2 m / min, a temperature of 1230 K for 1 min.

Thereafter, the movement in the bed of the combustion zone is interrupted for 0.45 by disabling the forced passage of air through the bed, and the movement of the fire zone in the bed is monitored visually. Then, the forced passage of I air through the bed at a speed of I 25 m / min is turned on until the completion of the process of specific firing, which is stopped at 673 K at the lower layer of the bed, I then finally turn off} forced air passage. I The finished material is unloaded, analyzed, and subjected to tests on

strength, porosity and yield of a year-I material.

I The results of the implementation of the proposed method are given in the table.

 As can be seen from the table, when; deviation from the proposed time-. of the termination interval: the movement of the combustion zone in the layer (0.25-0.7 min) downward does not maintain such parameters as the yield of sinter (; 70%) and its strength (60%), and if it is exceeded, the content increases residual sulfur (1.2%) and reduced porosity (: 30%).

The achievement of the effect on productivity in the proposed method is explained as follows. Upon ignition of the fuel of the charge due to the passage of air through it in the layer, a hot zone is formed, in which the rate of ignition of the adjacent layers does not coincide with the rate of heat exchange processes. As a result of the misalignment already at the initial moment after ignition of the charge, the hot zone has a certain (15 mm and more) length in height. In the course of further sintering, the hot zone constantly increases to 100 mm and more, as a result Consequently, the air flow rate and the level of attainable temperatures are reduced, which leads to a decrease in the productivity of the process and the quality of the product obtained. With the passage of material over the area of the machine when the forced transmission of air through the layer is turned off, the movement of the charge in the bed of the combustion zone stops. During the subsequent passage of the material over the zone of the machine, where air passes through the layer in the direction of the green layer, the heat exchange process in the gas-solid (material) layer is resumed immediately, while the charge fuel ignites due to the need to heat the boundary layer. hot zone of the layer to the ignition temperature of the fuel. This circumstance determines the reduction of the hot zone and the improvement of the gas-dynamic characteristics of the sintered material layer, and consequently, an increase in the productivity of the process.

The interruption of movement in the combustion zone immediately after ignition is due to the following. Immediately after ignition, the hot zone is minimal compared to its size on any other layer horizon during sintering. - When the combustion zone is interrupted immediately after ignition and subsequent forced air passage, the heat exchange zone approaches the combustion zone and, consequently, the maximum decrease in the hot zone. This cannot be achieved on other horizons of a layer for the reasons stated above.

When the process is performed under production conditions, movement control in the bed of the combustion zone can be carried out, for example, visually through transparent refractory caps.

31399363

Claims (1)

installed in the sides of the pallet aglo-formula of the invention of the machine. The method of sintering roasting of ores and concentrates including ignition The productivity of the process of an agglomerated layer of a moving material with the milking of a measure according to a known method consisting of air through it and without sucking is 40.2 t / m per day. Distinguished by the fact that, in order to increase productivity, The process, the movement of the material without pumping, makes it possible to increase the production of air during 0.25 times the agglomeration process in half to 0.7 minutes immediately after the ejection of the valve.