Slags from the production of high‐alloyed steel contain both chemically bound chromium (mainly as Cr2O3) in the mineral fraction and elemental chromium in the metallic remainders. Thermochemical post treatment of the slag in an electric arc furnace under reducing conditions enables the nearly complete recovery of the total amount of …
Slag produced as a byproduct in industrial processes, contains considerable metals contents, which need to be recovered to avoid environmental contamination. In present review, the types,...
Viscous behavior of slags during iron recovery from nickel slag by aluminum dross has been studied from 1773 to 1873 K. Additionally, the evolution of viscosity and structure in early and later periods of reduction process has been discussed, respectively. The following conclusions can be drawn based on the experimental results.
To improve the efficiency of iron recovery from steel slag and reduce the wear-and-tear on facilities, a new method was proposed by adding a secondary screen sizer to the magnetic separation process according to grain size distribution of magnetic iron (M-Fe) in the slag. The final recycling efficiency was evaluated by calculating the …
A novel technology, modified roasting in CO–CO 2 mixed gas and magnetic separation, was presented to recover iron from copper slag. The effects of various parameters such as dosage of flux (CaO), gas flowrate of CO and CO 2, roasting temperature, roasting time, particle size of modified slag and magnetic flux density on …
Iron/steel slag is composed mainly of CaO and SiO 2. In addition, blast furnace slag contains Al2O 3, MgO, and S, and steelmaking slag contains iron oxides (FeO, Fe2O 3), …
Synthetic (binary and ternary slag system) as well as industrial steelmaking slags were used in the experiments. Analysis of the reaction products was carried out using X-ray diffraction method. A possibility to transform the non-magnetic iron bearing compounds to magnetite in the steelmaking slag by oxidation has been confirmed.
Abstract The state of the art for the recovery of metals from steel industry by-products using hydrometallurgical processes is reviewed. The steel by-products are different slags, dusts, and sludges from a blast furnace (BF), basic oxygen furnace (BOF), electric arc furnace (EAF), and sinter plant, as well as oily mill scale and pickling sludge. The review …
A novel aluminothermic smelting reduction (ASR) process was investigated for cleaning waste copper slag; this process is not only able to recover valuable iron, but also eliminates hazardous elements from the end-of-life slag product.The effect of adding Al on the reduction of iron oxide and subsequent iron recovery from waste copper slag at …
Furthermore, copper slag is mainly composed of the fayalite (2FeO⋅SiO 2) phase, which means that iron could potentially be recovered from waste copper slag.Thus, we proposed adding a reduction stage as an additional step to the conventional copper smelting process in order to achieve both removal of hazardous elements and recovery …
To recover iron from water-quenched nickel slags, CaO was added. Thermodynamic analysis showed that CaO promotes the reaction between fayalite (Fe2SiO4) and O2. Phase diagrams of the …
When n C/n O=0.8, and reduction-melting time is 60 min at 1320°C, the recovery rate of iron is greater than 86.1%, and the mass fraction of iron in iron nugget is about 94.8%. Read more Article
A detailed evaluation of the cost and benefits of any heat recovery method is necessary based on the slag type and rate, target by-products, energy value to the plant and consumers, and processing costs. For example, the limitations of dry granulation could be the inability to recover iron from steel slags, post granulation.
Therefore, BOF slag crushing-free to recover iron resources is the goal. In the future research, iron recovery from BOF slag without crushing by adjusting the physical phase composition was intended. To reduce the energy consumption in the actual production. At the same time, the iron recovery rate was improved to increase the …
Granulated steelmaking dust with reducer (coal dust) was the input material. The products of the process are zinc oxide, iron alloy and slag, with properties meeting high ecological requirements. The technology does not generate solid waste. Zinc recovery is over 99% and iron recovery over 98%.
With the purpose of recovering the metal values, in this study the copper slag was reduced by coke and biochar at 1250 °C in an argon gas atmosphere using the isothermal reduction/drop quenching technique. The phase compositions of metal, matte, and slag were determined using electron probe microanalysis (EPMA). The effects of …
In this work, a new and carbon-free reductant, i.e., secondary aluminum dross, is used to replace coal to recycle valuable metals from copper slag by smelting reduction. The influence of substitution ratio on slag properties and metal recovery was investigated. The results show that the metal recovery is mainly determined by the …
recovery of iron from nickel slags. MATERIALS AND METHODS Materials Nickel slag is a by-product of nickel smelting and was collected from a plant in China. It was crushed to particle sizes of less than 0.096 mm. The compo-sition of the raw nickel slag in …
Innovative approach to recovery of iron from steelmaking slags A. Semykina1,2, V. Shatokha*1 and S. Seetharaman2 The present work is aimed at the development of a new sustainable method for the utilisation of valuable elements from the steelmaking slag. In the framework of the innovative concept earlier proposed by the authors for utilisation ...
This study explored the recovery of valuable metal elements in the lead smelting water-quenching slag using the method of "roasting–grinding–magnetic separation" at a roasting temperature of 1250 °C, coal dosage of 12.5%, roasting time of 90 min, …
To produce low phosphorus iron from steel slag, a smelting reduction method was used with secondary aluminum dross (SAD) as a new reductant. The effects of …
Steelmaking slags are usually processed for iron recovery by dry magnetic separation. The recovered iron-rich products are recycled back into the ironmaking and steelmaking processes to replace high-cost steel scrap and iron ores. However, current slag processing is far away from optimum conditions, especially for slag fines with small …
Iron and steel slags are valuable raw materials that are obtained during the pig iron and crude steel production processes. Two main production methods are involved (Fig. 1). In the iron ore-based process, pig iron is produced from oxidic iron ores in a blast furnace. ... In Europe, EUROSLAG records the production and slag recovery quantities ...
Abstract. The response characteristics of iron smelting reduction of copper slags were studied in this paper. With the molten slag basicity of 1·4, the γ (FeO) takes nearly a maximum value equalling to 4·27. The diffusion of (FeO) through the molten slag boundary layer to the molten slag–iron interface is found to be the rate-limiting step …
The iron element in electric arc furnace (EAF) slag is extremely difficult to recycle due to the low specific magnetic susceptibility of the RO phase (a solid solution of FeO, MgO, CaO, and MnO). Landfilling EAF slag is strictly forbidden for environmental consideration because of poisonous Cr6+ leaching. The original RO phase could be …
The iron recovery of the oxidation slags is calculated from the recorded grade and mass of magnetic slag by Eq. (4), as shown in Fig. 10 . (4) Recovery % = Q m × α m Q × α × 100 % Where Qm is the mass of the magnetic slag, αm is the grade of the magnetic slag, Q is the mass of the corresponding initial slag, and α is the grade of the ...
Furthermore, these slags contain up to 2% zinc, which is lost. Other processes like RHF, PRIMUS, OXYCUP, OXYFINES and Ausmelt [1,13,18,19,20] are less significant. These processes are intended for either zinc or iron recovery. ... It also allows recovery of iron in the form of an alloy suitable for further processing. It should also be ...
RECOVERY OF IRON FROM COPPER FLASH SMELTING SLAGS D Busolic1, F Parada1, R Parra1, J Palacios2, M Hino3, F Cox4, A Sánchez4 and M Sanchez5 1 Departament of Metallurgical Engineering, Universidad de Concepción, Chile Departament Metallurgical Engineering, Universidad de Atacama, Chile 3 Department of Metallurgy, …
To determine the iron recovery, a novel triangular material balance diagram, which represents the balance among the reduced iron ingot, the reduced iron …
the reformed slags with CaO additives, various solid-phases ... it was confirmed that reduction smelting by carbon at temperatures above 1400°С is possible to recover pig iron containing copper ...