SU1696530A1 - Method of agglomeration of charge - Google Patents

Abstract

The invention is intended for the forging of a mixture containing oily and non-oiled components and in the permeate. The aim of the invention is to increase the strength of the pellets. The method includes pelletizing and subsequent unburnt hardening, the oily component is first pelleted, and the hydraulically hardening agent is mixed with an oil-free material, and the mixture is rolled onto an oleaginous component. 1 tab.

Description

The invention relates to the field of ferrous metallurgy and can be used in the disposal of metallurgical wastes.

The purpose of the invention is to increase the strength of the pellets.

In the proposed method, at first, only an oily component is pelleted, and the hydraulically hardening substance is mixed with an oil-free material, and the mixture is rolled onto an oily component.

This technique allows you to limit the harmful effects of oil on the hydration of the substance, flowing in the mass of the charge that does not contain oily components.

Raw pellets are strengthened by known unburned methods (normal, accelerated, hardening, autoclaving).

The method is carried out as follows.

As an oily component, mill scale is used with an oil content of 10%. The same scale, calcined at 900 ° C to remove the oil, was used as a component that did not contain oil, and the magnetic concentrate was used as calcining. Portland cement clinker (PCC) and cupola slag mixed with lime in a 1: 1 ratio were tested as a binder. The chemical composition of the components of the mixture is given in the table. The ore part of the charge contained 90% fr. -74 microns, crushed to the ground to a specific surface of 400 m2 / g.

Granules with a grain size of 7–8 mm were obtained from the oily scale, onto which a mixture of an oil-free component was rolled, and a slurry, the content of which was 15% by weight of this mixture. The ratio of oily and non-oiled parts of the charge in the pellets was maintained at a level of 1: 1. Raw pellets

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strengthened: by the method of accelerated hardening (UT) - steaming at 90-95 ° C for 9 h and subsequent drying at 150 ° C and by the method of normal hardening (NT) - holding in a humid atmosphere for 28 days at 20-22 ° C .

Example 1. In accordance with a known method, all the components of the charge (2 kg of oily and 2 kg of calcined scale, 300 g of P CK) were mixed and pelleted with water to form pellets of 10-11 mm in size. The strength of the finished pellets was, daN / OK: UT 7; NT 5.

Example 2. In contrast to example 1, the CCP was replaced with a slag-and-limestone into the void. The strength of the finished pellets was daN / ok: UT 4; NTZ.

Example In accordance with the method, oily scale was preliminarily pelleted to a particle size of 7–8 mm, then pelletizing was continued with the supply of a charge that did not contain an oily component (calcined scale + 15% CCP). The consumption of materials was 2 kg of oily, 2 kg of calcined dross and 300 g of ACC. The strength of the finished pellets with a diameter of 10-11 mm was, daN / ok: UT 48; HT 54.

Example 4. In contrast to example 3, the CCP was replaced with a slag lime in the grip. The strength of the pellets was, daN / ok: UT35; NTZZ.

Example 5. In accordance with the method, an oily scale was precoated, then the pelletizing was continued with the supply of the charge consisting of 85% calcined magnetic concentrate and 15% PCR. The consumption of materials was 2 kg of oily scale, 2 kg of concentrate and 300 g of PCR. The strength of the finished pellets with a diameter of 10-11 mm was; daN / ok; UT53; HT42

Thus, the proposed method allows to increase the strength of the pellets in more than 5 cuts.

The increased strength of the pellets leads to an increase in the yield of the graded product by reducing the amount of fines produced (fr. 0–5 mm). As shown by the test, the amount of fines decreased by 13% (abs,) compared with the known method.

Claims (1)

Invention Formula The method of agglomeration of a mixture containing oily and non-oiled components and hydraulically hardening into a binder, including pelletizing and subsequent hardening of the pellets with unburned methods, characterized in that, in order to increase the strength of the rolls, they first pelletize the oily component, and hydraulically hardening into baking mixture. unsaturated component and the resulting mixture is rolled on the oil-containing pelletized component.