SU730844A1 - Method of producing sintering-free pellets - Google Patents

Description

The method is carried out in the following manner.

Initially, only the iron ore component and Portland cement are mixed, the mixture is directed to mechanical expansion, and at this stage the remaining components of the cement binder are introduced, for example, circumcise and mash chloride.

When sintering coking powder, a mixture of sludge from the blast furnace and the open-hearth production of roasting-magnetic enrichment concentrate and some soggy materials, magnesite is used as caustic X1 magnesite (S 29OOO cm g) and caustic

magnesite P class {And 2200 cm g). Magnesium chloride and 1 monium, hydrated lime use the grade of HC, as portlap cement bond - Portland cement clinker, crushed to

specific surface area of about 4000 cm /

The mixture was mixed manually and activated in a 55-liter laboratory rod mill for 3-5 minutes. An activated charge weighing 3.5-4.0 kg per second is charged on a 450 mm diameter drum granulator for 20 minutes. Lumps are usually applied by two methods: sushi (heated to 2 ° C for 2 hours - C) and the method of accelerated hardening (steaming + soup). Parked lead for 2,4,6 h at EO-YuO S (according to P., P., nj

Beimo

duration

subsequent drying at 200 ° C was 1 h (Cj). The diameter of the test pellets 15 + 1 mm

The chemical composition of the ore materials used in the experiments, caustic magnesite and portland cement clinker is presented in the table.

Sludge 42.2 54.0 7.1 46.7 56.6 7.7 Koloshnikov Dust Roasting-Magnetic Concentrate Caustic Magnesite Portpandcement 5.6 62.4 Kligaser

 Example 1 Pellets made from sludge made using a binder of 10% oxide and magnesium sulphide taken in a ratio of 1.5: 1 have strengths of Pt — C mode 1, 67, and 60, respectively,

PRI mme R 2. Pelletized mixture containing 86, O% sludge-a, 5% of Portland cement and magnesium oxide, 4, O%% of magnesium chloride. The components of the mixture are mixed at the same time, with its setting (solidification) noted even before activation. After activation and pelletizing, the strength of the pellets strengthened according to the Pb + C regime. | is 40 kg, and after 2 hours of drying at 2 ° C, 32 kg. I.e. Compared to the prototype, the strength of pellets that have been dried has noticeably increased, and the strength of accelerated hardening pellets even slightly decreased. The rapid setting of the mixture is explained by a high dispersion of 1.0.

sludge (S-ZOOO) and vigorous interaction of oxide and magnesium chloride with the formation of magnesium oxychloride.

Example 3. The mixture of the composition specified in Example 2 is pelleted. However, to reduce the setting time of the mixture, magnesia additives are introduced at the stage of mechanical activation of the mixture.

Below is a good deal - ". necks, kg:

Source P, +

2,48075

As can be seen, the pelletization of the charge using the method of separate introduction of the components of the binder increases the strength of the pellets and shortens the duration of their hardening as compared with the prototype.

Increasing the chloride content in the charge to more than 4% does not reduce the strength of the pellets, however, introducing such a quantity of additives economically doesn’t 3, 5 10.2 4,0 6,7 12,2 4,97,3 3, O 4,68,6 0.25 0.9 6, 2.1 22.1

Lesheobrazno. Use pellets,. determined in the cold state is not more than 5.0%,

Claims (2)

1. Report Development of a technology for accelerated hardening of unburned blast-furnace pellets from slimes and dusts of CMW. Sverdlovsk, Uralmechanobr, 1975 2. Patent Czechoslovakia № 115677 cl. 18a, 1/00, 1965.