SU800229A1 - Charge for smelting low-phosphate slag - Google Patents

Description

The invention relates to ferrous metallurgy, namely to electrometallurgy of ferroalloys, and can be used in the smelting of low-phosphorous manganese slag. The known charge for smelting low-phosphorous slag containing manganese concentrate, dump manganese slag slag, quartzite, and toxic ij. The disadvantage of the known composition of the charge is that it produces low-phosphorus slag with high silica loading (29–31%) and phosphorus (Jurassic (0, 018–0, O2%) with a comparatively low technical economic indicators of smelting). The most famous is the charge OLA of smelting low-phosphorous slag 2 J, with the following ratio of chefs, wt.%: Ma {) gantz concentrate 8O Quartzite9 Coxic6 Steel (cast iron) chips5 The disadvantage of the composition of the mixture is the use of quartzite as a powder, which leads to a decrease qualities of low phosphorus soda ash zhaniyu manganese, silica and phosphorus. Melted low-phosphorus slag has the following chemical composition, wt.%: M 41-43,5; SiOj 29-31; Р О, О14-О, О2. The high ratio of silica to manganese (tO, 7) in the slag does not allow for its redistribution to achieve deep extraction of manganese, and the high modulus of phosphorus (, OOO35). required quality of the metal content of phosphorus in it. This causes an increased consumption of slag, and with it electricity and other blended materials. The use of low-quality slag in the smelting of low-phosphorus grades of silico-manganese and ferromanganese is sharply worse than the economic indicators of their production. Smelting low-phosphorus slag with a reduced silica content using the fine composition of the charge because of the high viscosity of the melt and entanglement of the associated metal in it. Silica addition is economically unprofitable, since the slag multiplicity at the last stage of its use in the smelting of metallic manganese increases sharply (to 3.2-3.4), which leads to significant losses of manganese with waste slag containing, by virtue of ensuring uniform composition, about 15-17% manganese. Extraction of manganese in metall in the smelting of low-phosphorus grades of manganese alloys does not exceed 64%. The purpose of the inventions is to improve the quality of slag, increase the extraction of manganese, reduce the specific consumption of electric power, and involve sulfur dioxide in the production of waste. The goal is achieved by the additional introduction of iron-carbon material into the known composition of the mixture in the following ratio of components, wt.%: Manganese sinter 83-91 Cox4.2-6-6 Iron shavings0.3-2 Flat sulfur 4, W / red blend composition It is explained by the chemical composition of manganese concentrate, as well as the results of tests in the rudothermic electric furnace during the smelting of low-phosphorous slag. The selected ratio of the components of the mixture ensures the production of low-phosphorus slag with a composition of a following. % MP 41.7-42.4; 51Ol 28-29} P 0, O10, O12; S 1.5-3; At less than 4.5 wt.% Content of iron-sulphide carbon material, the necessary reduction in the viscosity of the slag is not achieved, which makes it difficult to separate particles of highly phosphorous associated metal and low-phosphorous slag by specific weight. This impairs slag quality. Studies have shown that at more than 9% by weight of the iron-sulphide material in the charge, the viscosity of the low-phosphorus slag is at the same level. The selected ratio of components, shikty allows to improve the quality of low-phosphorus slag and technical and economic indicators of the process. The extraction of manganese increased by 2–4% with a decrease by the same amount of consumption of the electrical act and. The increase in the extraction of manganese and the improvement of the main indicators of smelting is explained by the more favorable physicochemical properties of the proposed charge. Iron-carbon material is a waste product enriched with .- - NIN sulfur dioxide and has the following chemical composition,%: He 44-46; 3 42-45; C 8-10; (AggO.), 1-2; The presence of sulfur in the charge makes it possible to achieve the necessary viscosity of the slag without the use of quartzite, and the iron and carbon of the additionally added material contribute to the acceleration of the interaction and the reduction of phosphorus. The increased sulfur content in low-phosphorus slag has a positive effect and in the smelting of low-phosphorus grades of manganese ferroalloys. In tab. Figure 1 shows the results of testing the mixture of the proposed composition in the OKB-616 semi-industrial electric furnace during the smelting of low-phosphorus slag. In tab. 2 - the results of testing the mixture of the proposed composition in the industrial furnace RKZ-16.5 at the head of low-phosphorous slag. .

Table 1

Oven power, kW

Pr veaenva upvl a proieVoak without T / 1OOO ifiT.4

Waffle flow. Approved to ke, excluding slag crusts:

agglomerate. kg / bas.t of coke breeze, kg / bae.g chips, kg / bas.t carbonaceous pyrite, kg / bas.t alektrovergnn kWh / bae.t

Extraction of manganese,%

Sulfur Weighted Slag

World

Cao

13.444 12, EZO 1O, 750

Oi83 Oh, 919 0.850

42.4

41.7

0.011 O, O12 4.36.3 Comparatively, the furnace power is low in the second emergency state of the furnace.

The analysis of these data shows that the use of sulfur-containing coal enrichment waste in the mixture makes it possible to significantly improve the quality of slag by the content of phosphorus and silica in it. Thus, the slag yield with a specific concentration of phosphorus (% P) (% Mn) -2.5 3, according to the experimental variant, was 48%, and according to the current technology, 24%. Improving the quality of the obtained low-phosphorus slag made it possible to reduce the specific consumption of the reducing agent in the melting point of its smelting by 10.6%. At the same time, the slag yield {furnace productivity) significantly increased, the specific consumption of charge materials and electric power decreased (SO kW kWh / bt). Extraction of manganese in the slag increased by 4%.

Claims (2)

1.Ryss MA Production of ferroalloys, M., Metallurgists, 1975, with. 141. 2. Khitrik, S.I., et al. Electrometallurgists of Manganese Ferroalloys, Kiev, Technika, 1971, p. 136. option explained