The complex processing of titanomagnetite concentrates of the Gremyakha-vyrmes deposit with extraction of vanadium and titanium

Titanomagnetites are a complex raw material with a high content of valuable components: iron (35–65 %), vanadium (0.5–1.5 %) and titanium (2–14 %). Today, titanium–magnetite concentrates are processed in two ways: blast furnace (Russia, China) and using electric smelting (South Africa). The blast–furnace method is applicable only for low–titanium titanomagnetites. In the case of using titanomagnetite concentrates with a titanium dioxide content of more than 4 %, the method of electric smelting with preliminary reduction is applicable. Both technologies aim to recover the two components iron and vanadium, while titanium is not recovered. In this regard, the development of a complex technology for processing titanomagnetite concentrate to obtain iron in granular form, vanadium pentoxide and titanium is urgent.

Silica removal from waste of ilmenite concentrate pyrometallurgical processing

The article presents the study results for alkaline leaching of fine ilmenite concentrate dusts from electric smelting. The physical and chemical properties of the dusts were studied using chemical and instrumental analysis methods. The dust composition was determined, X-ray phase analysis showed that the dust sample substance is in the X-ray amorphous state, iron is present in the trivalent state, and silicon is bound to magnesium. The dust sample study using a scanning electron microscope showed that part of the titanium is bound in a hard-to-disclose anasovite encapsulated in amorphous silicon oxide. The leaching study of electric smelting dust with sodium hydroxide solutions included the study of the effect of sodium hydroxide concentration, process duration, temperature, S: L ratio. The optimal conditions for dust leaching from electric smelting of ilmenite concentrate have been established: temperature 80-90 °C, duration 90-120 min, ratio S: L = 1: 5, the concentration of sodium hydroxide solution 110-115 g/dm3. The silicon extraction degree into the solution under these conditions was 77.7%. The behavior of accompanying components of chromium, zinc, iron, and manganese during dust leaching was also studied. X-ray phase analysis of the cake after leaching shows almost complete amorphization of the leached product, the main phase is a solid solution of Fe2O3·TiO2.

Extraction Kinetics of Silicon, Aluminum, and Calcium from Dubersay Basalt by Electric Smelting

This article presents experimental results of extraction of silicon, aluminum into ferrous alloys and calcium into calcium carbide by electric smelting of basalt from Dubersay deposit. The studies were performed using thermodynamic simulation and electric smelting in arc furnace. The thermodynamic simulation was performed using HSC-5.1 software based on the principle of minimum Gibbs energy. The studied blend was smelted in one-electrode lined arc furnace. The experimental results of extraction of silicon, aluminum, and calcium from Dubersay basalt demonstrated that under equilibrium conditions, interaction of basalt with carbon and iron was accompanied by formation of CaSiO3 , Al2SiO3 , FeSi, SiO2 , SiC, CaSi, Na2SiO3 , SiO(g), Si(g), CaC2 , CaO, Ca(g), Al2O3 , Al, Al(g). During electric smelting of basalt it was detected that without lime silicon and aluminum were maximally extracted into alloy, and calcium into calcium carbide – in 30-45 min, herewith, the maximum extraction rate (76.5%) was observed for silicon extraction into alloy, and the minimum rate (65.3%) – for calcium extraction into carbide; when 25% of lime were added to basalt, the rate of calcium extraction into calcium carbide increased to 87.3% with simultaneous decrease in the rates of silicon and aluminum extraction into alloy to 71.4% and 60%; respectively; in order to achieve the rate of silicon and aluminum extraction into alloy of 76.1-76.8% and 70.0-72.4%, respectively, and of calcium into calcium carbide of 77-79.4% with production of calcium carbide of 235-239 dm3 /kg, the electric smelting of basalt should be performed with 7.3-11.2% of lime from basalt weight in 36.2-33.9 min.

Development of Metallurgical Processing Technology the Titanomagnetite Concentrate of the Tebinbulak Deposit

The approach to solving the problem of processing iron ore raw materials of Tebinbulak titanomagnetite deposit (Uzbekistan) is offered. It can provide high-quality steel products. The two schemes of processing of Tebinbulak ore are shown. The choice between the proposed schemes of the Tebinbulak ore processing: variant of "blast furnace – converter" and variant of "metallization – electric smelting" should be made after thorough analysis based on many factors.

Ferroalloy production from ferrosilicon manganese dusts

The article presents the results of studies on the influence of time, the amount of steel shavings and coke on the electric melting of ferrosilicon manganese dusts to obtain a ferroalloy. The research was carried out by the method of rotational planning of the second order (Box-Hunter plans) and by electric smelting of dust in laboratory ore-thermal arc furnace. Dust from the production of ferromanganese by LLP Taraz Metallurgical Plant, coke and steel shavings were used during the research. It was determined that to achieve αSi≥70%the process must be carried out in the presence of 25% coke and 8.1-9% steel shavings from the mass of dust for 55.8-60 minutes, to achieve αMn in an alloy of 80-85% the process must be carried out in the presence of 25% coke, 5.7-9.0% steel shavings for 41.2-54.4 minutes. When melting the charge containing 75.2% of dust, 18.8% of coke, 6% of steel shavings, within 60 minutes the weight of the ferroalloy was 258 g (38.8% of the weight of the charge or 51.6% of the weight of dust). The degree of extraction of manganese into the alloy was 82.3%, silicon - 66.1%. The resulting ferroalloy belongs to ferrosilicon manganese of the FeMnSi12 grade.