SU651045A1 - Method of preparing charge for producing manganese ferroalloys - Google Patents

Description

45-65 fractions 3-1 mm

20-30 fractions of 1-0.1 mm

15-25 fractions -0.1 mm and additionally naktayut on the surface of the formed granules 15-30% by weight of the concentrate, pig manganese slag with a particle size of less than O, 1 mm.

The method can be carried out as follows.

The mixture, consisting of thin concentrates, solid fuel, flux, return, and pig grades, is mixed in a drum mixer. At the same time, slag grains of 3-1 mm in size are the centers of granule formation; a mixture of concentrate with slag of a finer granulometric composition (1-0 mm) rolls over them. On the granules formed, in the second part of the drum-pelletizer, the fine slag fraction ({0.1 mm) is laid. .). Since the slag is mainly represented by silicates, the melting point of which is lower than the ore part of the charge, a melt will form inside the granules, which promotes the consolidation of the concentrate grains. The surface layer of granules: containing 15-30% of finely ground slag, during sintering will also soften and facilitate bonding of the granules to each other.

Experiments have shown that the best results in the distribution of slag in the bulk of the charge are achieved when. its granulometric composition is represented by fractions: 3-1 mm 45-65%; 10, 1 mm is 20-ZO%, and less than 0.1 mm is 1525%, and its amount in the charge is 2 ~ 4% by weight of the concentrate.

It is established that the amount of slag. in the charge before pelletizing above that presented, as well as the content of the fraction of 3–1 mm in the slag in excess of 65% is not allowed; tBit is a high-quality pelletizing process. Empirically also determine 45

It was said that the highest yield of agglomerate is obtained by rolling an additional 15-30% of pig slag onto the surface of the formed granules.

The content of the return in the composition of the mixture can be reduced from 40-45% to 2025%, thereby increasing the yield of the finished sinter.

The amount of pig slag introduced into the charge should ensure that an agglomerate is obtained (in terms of the phosphorus content) suitable for one-stage conversion.

Example. Manganese flotation concentrate containing,%: Mn-42.5 (02-11. CaO - 3.5, P - O, 3 toxic, return, low-phosphorous redox slag containing.%: Mn - 43.5, SiO - 28 , CaO - 5.6, P - O, 025, mixed in the following respect, parts by weight:.

45 20

Manganese concentrate

Return

7

Coxy

35

Pulp slag

including in charge:

2O 15

additionally to the surface of the granules

The resulting granules are seyl in agglomerate. For Comparison of speckled agglomerate from charge without inclusion of low-phosphorus slag and slag into it, is represented by a captured fraction of 10-O mm.

The test results are shown in the table.

The proposed method of preparing SHIKH1Y for the production of manganese ferroalloys provides, in comparison with the known methods, the possibility of sintering thin manganese concentrates with a significant increase in the productivity of sintering machines, leaving usable and improving the quality of sinter.

20

36

25

30 23 45

100

4.5

88

8.5

75 62

90 75 16 5 of the invention. Method of preparation of the charge for the production of manganese ferroalloys, including preliminary joint pelletizing of thin manganese concentrates with manganese pig slag, sintering of the pelletized charge, characterized in that, in order to improve the performance of the sinter machine, the yield is good and the quality is improved. before agglomerate, before pelletizing, OO-40% of the weight of the concentrate of low-phosphorous manganese slag redite fraction of 31 mm 45-65%, 1-O, 1 mm 2O-ZO%, less than 0.1 mm 15-25% and additionally roll forward Grade manganese slag with a particle size less than OD mm is supplied to the surface of the formed granules 15-ZO% by weight of the concentrate. Sources of information taken into account in the examination 1.S6, Manganese, № 1-2, 1975, P.91-1OO. 2. Japan Patent No. 883О, class 10 HI, 1G56.