Abstract. Primary slag formation of the blast furnace ferrous burden was experimentally simulated using synthetic MgO-Al 2 O 3-CaO-SiO 2 slags with FeO, Na 2 O, or FeS additions. The combined effect of FeO and Na 2 O or FeS was also examined. The melting behaviour and viscosity of five different base slags (sinter, pellet, or lump ore) were …
In this report the extraction of V(V) and Cr(VI) from a synthetic feed solution and real leaching solution of the chromium-bearing vanadium slag (V–Cr slag) using primary amine LK-N21 was studied. Detailed fundamental research work was conducted to investigate the primary amine extracting V(V) and Cr(VI).
Primary slag formation of the blast furnace ferrous burden was experimentally simulated using synthetic MgO-Al 2 O 3-CaO-SiO 2 slags with FeO, Na 2 O, or FeS additions. …
The primary slag formation is a significant process in BF smelting, which controls the permeability of burden layer, the quality of molten iron and smooth operation of blast furnace. And the region of primary slag forming is defined as cohesive zone, and …
Steel slag is a by-product of the steel production process, accounting for approximately 15% of the whole crude steel output [1].The accumulation of untreated steel slag not only occupies a significant amount of land but also leads to the leaching of heavy metal ions (such as vanadium, chromium, arsenic, lead, cadmium), polluting surrounding water sources …
tional slag chemistry to manage the drainage properties of the primary slag across the coke column. Moreover, combined with the viscosity studies of BF final slag, the results will help the blast furnace operator extend the selection of low-grade ore and maintain stability. The primary slag is generated from the soften-
Slags produced from metal refinery have been used in Ghana for several purposes including road, building and other constructions. However detailed compositions of these slags used are …
DOI: 10.1002/cjce.24621 Corpus ID: 251856496; Niobium and tantalum recovery from the primary source and from tin slag, an industrial challenge: a review @article{deOliveira2022NiobiumAT, title={Niobium and tantalum recovery from the primary source and from tin slag, an industrial challenge: a review}, author={Juliana Mendes de …
Ghana: Primary school enrollment, percent of all eligible children: The latest value from 2021 is 97.9 percent, an increase from 96.87 percent in 2020. In comparison, the world average is 100.00 percent, based on data from 143 countries. Historically, the average for Ghana from 1971 to 2021 is 78.31 percent. The minimum value, 58.77 percent, was reached in 1972 while the maximum …
Primary slag formation of the blast furnace ferrous burden was experimentally simulated using synthetic MgO-Al2O3-CaO-SiO2 slags with FeO, Na2O, or FeS additions. The combined effect of FeO and ...
To investigate the flow of primary slag bearing TiO2 in the cohesive zone of blast furnaces, experiments were carried out based on the laboratory-scale packed bed systems. It is concluded that the initial temperature of slag dripping increases with decreasing FeO content and increasing TiO2 content. The slag holdup decreases when the FeO ...
The formation process of blast furnace slag is mainly divided into three steps: primary slag, intermediate slag, and tapped slag. (1) Primary slag. It is formed along the top edge of cohesive zone and starts to drip when flowing to the lower edge of cohesive zone. The formation of primary slag includes solid-state reaction, softening, melting ...
In this study, the roles of MgO and Al2O3 in the viscous and structural behavior of CaO-MgO-Al2O3-SiO2-10 mass pct FeO (CaO/SiO2 weight ratio of 1.4) primary slag were investigated.
At present, cost reduction and environmental protection are the mainstream of blast furnace (BF) development and the high lump ore ratio is an effective means. Therefore, it is significant to explore the relationship and mechanism of burden soft-melt dropping and its primary-slag formation behaviors under increasing lump ore ratio. In this paper, the melt–drop test is carried …
Primary slag formation of the blast furnace ferrous burden was experimentally simulated using synthetic MgO-Al2O3-CaO-SiO2 slags with FeO, Na2O, or FeS additions. The combined effect of FeO and ...
Technological procedure of slow cooling slag from primary copper production is applied in the purpose of copper recovery in the level of 98.5% to blister. This technological procedure is divided into two phases, first slow cooling of slag on the air for 24 hours, and then accelerated cooling with water for 48 hours. Within the research following methods were used: …
There are different types of ferrous slags, each one named from the process of which they are generated: blast furnace slag (BF) also called iron slag, basic oxygen furnace slag (BOF),...
The investigation of biomass primary tar reforming over steel slag based catalysts was carried out in a two-stage fixed bed reactor, as shown in Fig. 1. The two-stage fixed reactor was made of quartz with inner of 300 mm and total length of 875 mm. Two sintered porous quartz plates were included in the reactor, which divided the reactor into ...
The free running temperature of the primary-slag decreases from 1285 to 1234 °C, the initial viscosity decreases from 1.13 to 0.92 Pa s, and the high-temperature viscosity decreases from 0.46 to 0.24 Pa s with increasing MgO. The depolymerization of the primary-slag structure enhances with increasing MgO, which has a significant effect on the ...
Slag phases can be divided into interfacial slag and endogenous slag, depending on the formation pathway [12]. In particular, the endogenous slag phases formed within the ore are the basis for the formation of interfacial slag phases [13], [14], [15]. However, cohesive zone slag, called primary slag, is always treated as a whole [16], [17], [18 ...
In the slag, the electrons are replaced by oxide ions. Acidic oxides absorb oxide ions, while basic oxides release oxide ions. Based on this theory, the British scientists J. A. Duffy and M. D. Ingram from 1971–1975 proposed to express the acidity and basicity of oxides in terms of the ratio of the ability to release electrons from various ...
The effects of MgO, Al 2 O 3, C/S (CaO/SiO 2 ) and FeO on the viscosity and the liquidus temperature ( T LQ ) of blast furnace (BF) primary slag were analyzed by using multiphase equilibrium. The results show that the T LQ of primary …
primary slag with more than 60 pct MnO to 15 to 40 pct MnO in the tapped slag, while SiMn charge mixes is reduced from a primary slag with more than 35 pct MnO (as the Mn-sources are mixed with both fluxes and quartz) to around 10 pct MnO tapped at 1600 C.[16] The slag composition will of course be affected by the temperature.
Using the Iron ores-Method for determination of iron reduction softening drippinger performance under load (GB/T34211-2017) 14) to simulate the formation process of slag-iron in the cohesive zone under different atmospheric conditions, the experimental setup is shown in Fig. 1.The sintered ore, pellet, block ore, and coke used are all from the blast furnace production site of a …
Primary completion rates look at children aged 3-5 years older than the entry age for children for the last grade of primary school, so the target population will be children aged 14-16 years who have not completed primary education. In Ghana, 55 per cent of children in the target population are male, therefore 45 per cent have to be .
In this work, a new method for optimisation of blast furnace burdens was studied based on the primary slag formation behaviour because it has significant influence on the formation of the cohesive zone. The results showed that there was obvious interaction between sinter and acid iron ores at high temperature, and the primary slag formation ...
The primary-slags formation behaviors of sinter, lump ores and integrated burdens were studied to explore the high temperature interaction between sinter and lump ores in blast furnace.
The thermodynamic and kinetic properties of the carbothermic reduction of MnO in the five-component slag, MnO-SiO2-CaO-MgO-Al2O3, is critical in the production process of Mn-ferroalloys. While the reduction rate is mainly dependent on the presence of a solid MnO phase in the slag for Mn-Fe-alloys, the rate for the Mn-Si-Fe alloys has two distinct steps, a slow step …