SU1235962A1 - Method of smelting metal manganese - Google Patents

Description

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

The purpose of the invention is to improve the quality of metallic manganese, to increase the extraction of manganese from the concentrate and to ensure the possibility of slag utilization.

Example 1. Smelting manganese metal limestone method

For melting, a calcium chloride concentrate containing,%: 87, CaO 7, CaCl, 4, SiOj 0.3, 0.1, PjOj — traces, S — traces; silicomanganese, contents,%: Si 26.7, Mp 71.17, Fe 2.73, A1 0.3, C 0.18, P 0.03, S 0.02; dolomite containing,%: CaO 51.5, MgO 33.85, SiO., 2.54, AljO, 1.69, 1.86, FjOy 0.078, SO, 05 (ppt 8.5 %) and lime containing,%: CaO 85.07, MgO 2.5, SiOj 2.17, 1.67, 1.84, 0.08, S 0.1 (item 6.7 %).

The furnace melts the charge, kg: Concentrate 53.7

Silikomanganese 21.0 Dolsmit11,3

Lime14,0

After the melt of the melt is melted, 48.5 kg of briquettes containing kg are loaded onto the surface of the melt:

Concentrate17,6

Silikomanganese 22.3 Alnzminy I 5

Dolomit3.9

Lime2,9

Binding0.4

The result is 62 kg of metal composition,%: Mp 96.5; Fe 2.59, Si 0.68; P 0.031; S 0,018, and 85 kg of Sclac containing,%: SiOj 29} Mp 14,5; CaO 32; MgO 12. 0.02 kg of phosphorus (including from silicon-manganese 66 and fluxes 34), 0.011 kg of sulfur (including from silico-manganese 75 and fluxes 25%), 1.6 kg of iron (including silicomanganese 73, from fluxes 23, concentrate 2%).

The beneficial use of silicon and aluminum in cyswe for the reduction of manganese oxides (from Mn, 0 to Mn in slag and to Mn in metal) is 91.4%.

Extraction of manganese in the alloy 79.5%, including the extraction of manganese from the concentrate 65.4%. Slag

five

0

five

it is distinguished by a high SiOj content (29%) and em either to the dump or to the sintering of iron ore at a price of 6-8 rubles / ton.

Example 2. Smelting of manganese metal by the proposed method.

The experiments were carried out in a furnace with a coal heater. In the furnace, heated to 1550 ° С, a crucible is placed into which a well-mixed mixture consisting of calcium chloride and aluminum is loaded. After the mixture is expanded, briquettes consisting of calcium chloride, aluminum, manganese-aluminum alloy, lime and a binder are loaded onto the melt mirror. After melting the briquettes, they make a five-minute exposure, the crucible is removed from the furnace, and the metal and the donkey are poured into a mold. It is then reloaded into the kiln and treated with briquettes consisting of calcium chloride concentrate, aluminum, taken with a large excess, lime and a binder BjOj. The composition of the concentrate and lime is the same as in the known method.

The test results of smelting manganese metal using aluminum as a reducing agent at different ratios between the components of the charge to produce a melt, at different briquette composition for its processing, as well as at different composition and consumption of briquettes for nmaica treatment (before reduction) are listed in Table. 1-4, respectively.

In tab. 1 and 2 use briquettes of the following composition,%:

Concentrate40

A1 powder 17,5

Alloy Mn-A110

Lime31

Binding1,5

From the obtained results it can be seen that in the proposed method of smelting manganese metal is characterized by a very low content of harmful impurities - phosphorus and sulfur. The phosphorus content in comparison with the known has decreased by 4.0-6.8 times, the sulfur content is 4.5-9.0 times. The content of the dressing was also reduced (1.5-2.5 times).

3

The through extraction of manganese from the concentrate due to the treatment (before reduction) of pshak with briquettes increased to 91-93%. On average, manganese extraction increased 1.40- 1.43 times. The useful use of aluminum is 92-96%. Its yield ranges from 470 kg / ton.

From table 4 it can be seen that the resulting final putty consists mainly of calcium oxides and alkyne oxides and contains the minimum amount of manganese. Such pshak can be used to process steel in a ladle. To do this, before entering it into the steel, add 160–220 kg / ton of lime.

Thus, the proposed method of smelting in comparison with the known method allows to improve the quality of the alloy in terms of the content of harmful impurities - phosphorus, sulfur and iron. Soder5

five

0

Sulfur content, in comparison with the manganese metal grades L1 and Mp 2, decreases by a factor of 10, and in comparison with the marks obtained by the aluminothermic one-step process, by a factor of 100. The consumption of alkaline and charge components is also reduced; x. Only by reducing the consumption of aluminum, the cost of the alloy is reduced by 60-70 rubles / ton. In addition, the extraction of manganese in the metal increases by at least 8-10%, and the through extraction of manganese from the concentrate - by 25-30%. Compared to the aluminothermic one-step melting, the consumption of the concentrate is reduced by 500 kg / t, and compared to known way - at 250-280 kg / t. The resulting slag is practically free of silicon oxides, which allows it to be used as synthetic slag for treating steel in a ladle, as well as for producing frost-resistant varieties of cement.

T "0lnts" 1

0,0041,0518,4385,7687,3993,4

0,0011,9537,8487,6189,0793,15

0,0031,7326,1590,0291,2194,60

0.0010.1456, 1591.3496.2

0,0010,2955,991,1692,2595,67

1235962 Table

Table 3

0,0030,2592,08 93,16,00

0,0041,06290,11 91,336,13

0,0031,45289,09 90,387,01

0.0031., 58187.1 G 88.457.95

0,0032,05286,1.87,388,53

n

30.583.0 16.94 0.06 81.67 2.332.054.0It, 7,168.5 29.7 78.33 21.55 0.12 87.3 2.6535.552.879.03 162.1

28.679.3 20.6 0.1 87.8 2,4234,356,56,78160.8

"26, 3 76.3 23.48 0.22 82.66 3.2337.155.24.47 156.8

22.3 74.5 25.21 0.29 75.37 6.1332.556.15.27159.7

1235962

12, Table

Claims (6)

1. METHOD FOR Smelting METAL Manganese, including dosing, loading and melting a mixture of calcium chloride concentrate and a reducing agent, treating ore melt with briquettes of calcium chloride concentrate, reducing agent, lime and a binder, holding the melt and separating the metal from slag, characterized in that, with the aim of increasing the quality of metallic manganese, increasing the extraction of manganese from the concentrate and providing the possibility of utilizing slag; aluminum is used as a reducing agent for melting the charge; after separation from the treated metal briquettes, where the reducing agent is used as aluminum, thereby obtaining a manganese-aluminum alloy, its separation from the slag, by cooling, grinding and use as a mixture with aluminum as the reducing agent in the processing of ore briquettes to melt. 2. The method according to claim 1, characterized in that the mixture is melted in the following ratio of components, wt.%: Calcium Chloride Concentrate 89.5-90.5 Aluminum 9.5-10.5 3. The method according to PP. 1 and 2, which includes the fact that the briquettes for processing ore melt in the ratio 38.5- 42.0 a S 9.0-11.0 '17.0-18.5 29.5- 31.5 1.0-2.0 4. The method according to PP. 1-3, characterized in that the briquettes for processing ore melt are used in an amount of 1.5-1.7 t / t of molten charge. 5. The method according to PP. 1-4, characterized in that the briquettes for; slag processing is used in the following ratio of components, May.%: use with the following components, wt.%: Calcium Chloride Concentrate Manganese Aluminum Alloy Powder Aluminum Lime Binder Calcium Chloride concentrate 54.5-58.0 Aluminum 33.0-34.0 Lime 7.0-10.5 Binder 1.0-2.0 6. The method according to PP. 1-5, characterized in that the briquettes for processing slag are used in an amount of 0.45-0.5 t / t of molten mixture. SU 1235962 A1