SU1615205A1 - Method of processing red slurries - Google Patents

Abstract

This invention relates to the complex processing of mineral raw materials in metallurgy. The aim of the invention is to reduce the consumption of solid reducing agent in the pyrometallurgical processing of red mud in two stages. The solid reducing agent is introduced in both stages. At the same time, in the first stage, the solid reducing agent is introduced in the amount of 50-75% of the total consumption, and the mixture is reduced to the degree of metallization of the red mud 70-85%, and the secondary recovery and carburizing are carried out in the second stage with the introduction of the remaining part of the solid reducing agent. In this case, the latter is introduced into the second stage with a particle size of 10-15 mm. 2 tab.

Description

The invention relates to metallurgy, in particular, to the complex processing of red mud formed during the processing of bauxite ores, and can be used in the conversion of high iron bauxite and high alumina iron ore.

The aim of the invention is to reduce the consumption of solid reducing agent.

Example. The experiments were carried out in laboratory conditions and in a semi-industrial installation.

The structure of the semi-extruded unit includes two tubular rotary kilns. The reduction furnace has a length of 12 m, the furnace for melting is 3.8 m, the diameter of both furnaces is 1.2 m. The furnaces are equipped with burners for burning fuel oil.

The starting materials used are: red mud, containing,%: 48.6; CaO 8.5; siO 6.6; 12.8; coke breeze with ash content of 21%, consisting of,%: 510243.4; 26.7; CaO 6.5; known for, containing,%: CaO 54.0; SiO 1,2; the rest is ppt

Coke breeze (blast furnace coke screenings) with a maximum piece size of 20 mm is screened on screens with a hole size of 15 and 10 mm. Class 10-0 mm, regrind to a particle size of 3-0 MMj serves as a reducing agent in the first furnace. Classes 10-15 and 15-20 mm are served in the second furnace.

cl

IN

cl

The results of the heats are given in table. 1 and 2.

As follows from the results given in table. 1, the introduction of a reducing agent in both furnaces makes it possible to significantly reduce its consumption as compared with the known method. The best results with the introduction of the recovery furnace 50-75% coke.

At the same time, besides saving solid fuel, the consumption of lime is reduced and the quality of the spike (flint module, ratio: SiOj ,, increases from 1.46 to 1.68) for the next glint extraction from it.

earth.

The redistribution of the supply of solid reducing agent does not affect the quality of the cast iron. Cast iron has the following composition:%: C 2.90 - 4.46; Si 0.016-0.3 B 0.072 - 0.56; S traces - 0.13; Ti traces - 0.37.

From the results shown in Table 2, which reflect the effect on the red sludge processing performance in rotary kilns, the particle size of the solid reducing agent supplied to

melting furnace, it follows that the best results, both in terms of the consumption of solid reducing agent, and in terms of the quality of the alumina slag, have been trained when coxy is introduced into the second furnace with a particle size of 10–15 mm.

Formula

the invention

A method for processing red mud, including heating it with lime and a carbonaceous reducing agent in two stages, to produce pig iron and slag that self-dissipates upon cooling, characterized in that, in order to reduce the consumption of solid reducing agent, the latter is introduced into both stages; the reducing agent is introduced in the amount of 50-75% of the total consumption and the charge is reduced to the degree of metallization of the red mud 70-85%, and the re-recovery and carburization are performed in the second stage with the introduction of the remaining part erdogo reductant.

Table 1

Table 2

Claims (1)

Claim A method of processing red mud, including heating it with limestone and a carbon reducing agent in two stages to produce cast iron and slag self-disintegrating upon cooling, characterized in that, in order to reduce the consumption of solid reducing agent, the latter is introduced in both stages, with the solid reducing agent in the first stage introduced in an amount of 50-75% of the total flow rate and restore the mixture to a degree of metallization of red mud sludge 70-85%, and re-restoration and carburization is carried out in the second stage with the introduction of the remainder of the TV rdogo reductant. Table 1 Way Coke consumption IN Consumption coke in Consumption Power The composition of the slag restorative melting furnace known metal % bake NIKU $ J1 AND 3 kg / t % of'ob- kg / t in the 1st CaO Si0 ₂ A1 ₂ 0 _e kg / t % of about- sludge of what sludge furnace% sludge of what Famous ny 400,0 100.0 - - 430.0 95.0 56.3 .17.7 26.0 Pre- pulled 1 1 350,0 87.5 50,0 12.5 410.0 85.0 56.3 17.4 26.3 2 250,0 83,4 50,0 16.6 380.0 85.0 56.4 16.8 26.8 3 200,0 80.0 50,0 20,0 380.0 80.0 56.3 16.6 27.1 4 150.0 75.0 50,0 25.0 360.0 80.0 56.7 16,2 27.1 5 130.0 65.0 70.0 • 35.0 360.0 75.0 56.6 16,2 27,2 6 110.0 55.0 90.0 45.0 360.0 75.0 56.5 16,2 27.3 7 100.0 50,0 100.0 50,0 360.0 70.0 56.4 16.1 27.3 8 100.0 45.5 120.0 . 54.5 370.0 70.0 56.5 16,2 27.3 .9 100.0 43.5 130.0 56.5 370.0 70.0 56.6 16,4 27.0 ⁵ 1615205 table 2 Way Fineness, mm Consumption solid Slag composition % solid war dogo revolt t stanosis in the 1st furnace inhabitants in the 2nd furnace innovator in 2nd furnace,% of the total CaO sio ₂ A1 ₂ 0 ₃ Famous proposed 3-0. 56.3 17.7 26.0 1 3-0 0-10 52.0 56.4 16.8 26.8 2 3-0 10-15 25.0 56.7 16,2 27.1 3 3-0 10-15 50,0 56.4 16.1 27.3 4 3-0 15-20 55.0 56.6 16,4 27.0