SU1291619A1 - Charge for producing manganese sinter - Google Patents

Abstract

The invention relates to the field of metallurgy, in particular to a mixture for the production of manganese sinter in the production of ferromanganese. The aim of the invention is to improve the quality of the agglomerate by increasing its vapor and moisture resistance and melting temperature. Sintering of the manganese agglomerate from manganese concentrate is carried out in a ratio of CaO + + MgO / Mn and 0.200-0.350 with solid fuel 4-11 wt.% And the return of the agglomerate is 10-40% by weight. Put-; The addition of a manganese concentrate with the specified ratio to the mixture makes it possible to increase the steam and moisture resistance by 29.4% and the melting point by 87 ° C. 2 tab. S (l

Description

eleven

The invention relates to metallurgy and can be used in the production of ferromanganese.

The aim of the invention is to improve the quality of the agglomerate by increasing its vapor and moisture resistance and melting temperature.

To confirm the choice of the boundary values and the optimal ratio of the components of the proposed mixture, a comparative analysis of the properties of the agglomerate obtained from the mixture of the proposed and known compositions is carried out in the laboratory of preparation of the raw material under identical conditions.

To confirm the selected boundary values

Soo + MgO Mn

and

in Margenese

the raw materials are compared with an LIS of the properties of the agglomerate obtained at the proposed mixture, with the optimum ratio of components and different CaO + MgO / Mn ratios and in manganese raw materials.

Experimental sintering of manganese sinter is carried out on a pilot plant with a sintering area of J, 0 m. The depth of the layer in all experiments is 350 mm, the initial vacuum under the wheel is 800 mm water column, the duration of ignition is 1.5-2 minutes at. The yield of sintered cake is determined by the content of the +1 O mm fraction after a single drop of the agglomerate cake with a height of 2 m. The strength of the agglomerate is determined by the content of the fraction.-5 mm after three times. dropping from a height of 2 m, the mechanical strength of the agglomerate - according to GOST. The steam resistance is determined by the content of a fraction of -5 mm after treating the vapors for 90 minutes. Samples of an agglomerate fraction of 10-80 mm, whose weight is 1 kg.

The chemical composition of samples of manganese concentrates used in sintering sinter at a known and 50 proposed charge is given in Table. one ,

As a solid fuel, screenings of coke are used (C, 72.8%).

The composition of the known charge and the proposed composition of fir for the production of manganese sinter, as well as the test results of the sinter are given in Table 2 ,.

0 -5

0

five

0

five

0

five

0

five

19 2

To confirm the selected boundary values, the sintering of the known mixture (options 1 and 2) and the proposed (options 3-7) compositions containing manganese raw materials with an intermediate CaO + + MgO / Mn and Si04 / Mn ratio (0.238 and 0.256) is carried out. that the optimal composition of the proposed mixture is the composition in the following ratio of components, wt.%: solid fuel 7.5 j return sinter 25; manganese concentrate - the rest. According to the results of these experiments, in order to substantiate the proposed boundary values of the CaO + MgO / Mn and SiO- / Mn ratios in the manganese concentrate, experiments 8 and 9 are carried out, and the composition of the charge for sintering the agomerate is taken according to the established optimal values.

The IE data of Table 2 shows that the introduction of manganese concentrate with the ratio of CaO + MgO / Mn and in the range of 0.200-0.350 to the agglomerate makes it possible to increase the yield of sinter in the class of +10 mm on average by 6% {strength in the class of +10 mm - by 37.4%, Parovlagostvo (class -5 mm) - by 29.4%, melting point - 87 C. After the reduction of CO and H, the fines output (class -5 mm) is reduced by 36%.

Studies have also established (options 5, 8, and 9) that when sintering sinter on the optimal composition of the proposed charge for producing manganese sinter, the yield of software grade +10 mm increases by 21.3%, the strength of sinter grade +5 increases by 39, 3%; Steam-moisture resistance of -5 mm class - by 31.5%. The melting point of the agglomerate rises by.

Claims (1)

Invention Formula The mixture for the production of manganese sinter, containing manganese raw materials and solid fuels, is so powerful that, in order to improve the quality of sinter by increasing its steam and moisture resistance and melting temperature, it additionally contains a return of sinter and manganese as a manganese raw material Cdcentre with the ratio of CaO + MgO / Mn and SiOjj / Mn 0,200 - 0,350 in the following ratio of components, wt.%: 43, 7 30, 3 38.6 37.8 40.6 7, 11.6 9.9 13.2 8.2 Indicators niEIirZZZIZnii 78 78 79 79 0.1690.3830.256 0.1650.430.238, 012.0 10,010,012,0 -. 69, 5 63.0 75.0 74.1 33.0 89.0 31.5 40.3 12.0 . 1336 1380 1400 Z 32.8 54.9 8.8 11.0 10 79.0 90.5 6.5  l440 8.3 VNIIPI Order 206/30. Circulation 605 Subscription Prod. pr-tye, Uzhgorod, st. Project, 4 1.6 2.05 1.5 2.3 1.6 0,1690,165 0.3830.43 0,2560,238 0,3490,341 0,2010,204 m l 2 Vnhty composition options eight 56 56 67.5 67.3 9.349 0.203 0.341 0.20 88.0 $ 4.0 4.0 1470 86.5 91.6 5.7 1430 7.5 4.0 3.0 7.5 7.5 25 40 41 23 25 73.2 V6.9 88.1 87.0 83.5 I, O 8.6 4.7 1410 .1490 6.0 7.5 9.0 6.7 .five I47j 6.0