SU1541293A1 - Charge composition for producing manganese sinter cake - Google Patents

Abstract

The invention relates to the preparation of manganese-containing raw materials for the production of ferroalloys. The purpose of the invention is to increase the mechanical strength, moisture resistance and performance. Dehydrated alumina enrichment wastes are additionally introduced into the mixture in the following ratio, wt.%: Flux 2 - 40

solid fuel 6-12

dehydrated alumina enrichment waste 5-25

manganese concentrate else. 1 tab.

Description

The invention relates to ferrous metallurgy and can be used in the production of manganese sinter for the smelting of ferromanganese in blast furnaces or electric furnaces.

The aim of the invention is to increase the mechanical strength, moisture resistance and performance.

To confirm the choice of the boundary values of the charge components, a comparative analysis of the properties of the agglomerate obtained from the proposed and known charge is carried out.

Manganese concentrate of composition is used for sintering,%: Mp 42.3; 810g, 16.7; CaO 4.7; MgO, 1.22; Feosw 0.82, fraction 10 mm, humidity 8-12%, coke breeze (-3 mm), known for shell rock composition,%: 810 g 1.3; CaO 49.4; MgO 1.6; Rev | Ts1,0, fractions 3-0 mm and waste enrichment of alumina composition, JJ:

 YU; MgO

,, 32; CaO 23;

Fez °,

1.5; Si02 5.

Experimental sintering of sinter was carried out on a semi-industrial installation with a sintering area of 1.0 m2. The height of the layer in all experiments is 400 mm, the initial vacuum under the grate is 850 mm water column, the duration of ignition is 1.5-2 minutes at 120 ° C. The yield from the cake is determined by the content of the fraction + 10 mm after a single drop of the agglomerate cake from a height of 2 m.

The mechanical strength of the agglomerate is determined according to GOST. The steam and moisture resistance of the agglomerate is determined by the content of the fraction + 5 mm after steaming for 90 min. Samples of the agglomerate of the fraction 10-80 mm weighing 1 kg.

The composition of the experimental fir and the results of industrial semi-industrial sintering

four

Isd

WITH

with

31541

manganese sinter is given in the table.

From the table it follows that the sintering of manganese sinter from the mixture of the proposed structure with the additional introduction of dehydrated

alumina (iron flux) enrichment courses allows an increase in the yield of class +10 mm by 26%, class strength +5 mm by 39.6%, and moisture resistance by 47%. After the reduction of CO and H2, the yield will increase from 52-54 to 94%, and the specific productivity - from 0.46-0.48 to 0.7 t / m2, h.

five

2934

Claims (1)

Invention Formula The mixture for producing manganese sinter, including manganese materials, solid fuel and flux, characterized in that, in order to increase mechanical strength, moisture resistance and productivity, the mixture additionally contains dehydrated alumina enrichment waste in the following ratio of ingredients, wt.%: Flux Solid fuel Dehydrated alumina enrichment waste Manganese materials 20-40 6-12 5-25 Rest Composition and properties Indicators for the charge Famous riZLIi ninirXiTIZI Content of components,%: manganese concentrate60 known to-known limestone-shell 32 dolomite- solid fuel (coke breeze) 8 enrichment waste alumina- Yield (class +10 mm),% 62 Durability of sinter (class +5 mm),% 56 Steam moisture resistance (class +5 mm) after steam treatment,% 51 Yield after recovery of CO and Ng at 1000-1100 С (class +5 mm),% 54 Specific productivity, t / m2.1 0, Proposed 68.7 95 98 94 74.3 86 94 88 0.54. 0.62 0.7 0.6 48.3 51.4 0.45