Figure - available from: High Temperature Materials and Processes
This content is subject to copyright. Terms and conditions apply.
Source publication
In order to recycle the phosphorus in P-bearing converter slag and make it used as slag phosphate fertilizer, the effect of MgO and MnO in P-bearing steelmaking slag on phosphorus existence form, P2O5 solubility and magnetic separation behavior were researched systematically. The results show that the phosphorus in slag is mainly in the form of n2C...
Similar publications
Steel slag from an electric arc furnace (EAF) may contain significant amounts of oxides of valuable metals. The recovery of iron and other metals from the EAF slag using smelt-reduction process was studied with coal as the reductant. A pig iron phase with high carbon and a final slag depleted of the valuable metals were generated. SEM-EDS and ICP a...
Citations
... Their experimental results confirmed that under the optimal conditions, an oxide with a nearly equivalent composition of phosphorus-rich solid-solution phase was collected at a 62% recovery ratio from the ground steelmaking slag. The effect of slag composition on the magnetic separation behavior was investigated [42,43]. The addition of FetO, MnO, and MgO had little effect, but the addition of 10 mass % of SiO 2 or Al 2 O 3 increased the recovery ratio to approximately 80%. ...
Steelmaking slag is artificially produced to remove, among others, the phosphorus from molten steel; approximately 120 kg of slag is formed per ton of steel. At present, steelmaking slag is mostly used for road construction and civil engineering materials. However, the slag cannot be sold at a high price and, in advanced countries, its market for civil work is shrinking and regulations to protect the environment are becoming more severe. There are two solutions to the problem of steelmaking slag: one is to decrease the generation of slag, and the other is the development of reuse methods. In this paper, the measures to decrease slag formation are first discussed based on the mass-balance calculation, and then the present and future states of slag valorization in Japan are reviewed. In the first part, the importance of the hot-metal dephosphorization process and the recycling of decarburized slag is clarified. In the second part, as a new field of slag valorization, the use of slag in marine environments is explained. Several studies to extract phosphorus and manganese from slag were also introduced.
Due to their biocompatibility, superelasticity, and corrosion resistance, binary and ternary NiTi (NiTiNOL) shape memory alloys (SMAs) are at the forefront of materials research for biomedical applications. The first half of the study reviews the biocompatibility and uses of NiTi SMAs. Traditional machining techniques have difficulty dealing with binary and ternary NiTi SMAs. The second half of the research discusses the literature review of unconventional SMA machining techniques from laser beam to wire electrical discharge machining (Wire EDM). Significant output responses, such as surface roughness and material removal rate, are also investigated as a function of numerous non-traditional machining process input factors. The conclusion outlines the few areas of research that remain to be done on the subject of NiTiNOL SMAs' machinability.
During oxygen refining of steel, the slag undergoes large variations in terms of its composition, temperature, and oxygen partial pressure. This paper presents a study of the state of CaO–FeOx–P2O5 and CaO–FeOx–SiO2 based slags under various process conditions by means of thermodynamic calculations using a newly developed thermodynamic database. The database is developed in the scope of the European project BOF DePhos (RFSR‐CT‐2014‐00005) for the purpose of investigating different thermodynamic aspects of phosphorous containing steelmaking slags in the composition, temperature, and oxygen partial pressure ranges relevant for the industrial process. The non‐ideal associate solution model is used for the description of the Gibbs energy of the liquid phase and the compound energy formalism (CEF) for the description of the Gibbs energy of the solid solution phases. By means of coupling the thermodynamic database to the Software FactSage™, the state of the quasi‐ternary oxide systems CaO–FeOx–P2O5 and CaO–FeOx–SiO2 systems relevant to low and high phosphorus refining processes, respectively, is investigated. The results of the calculations are compared with reported experimental data in the literature and indicate that the incorporation of the effect of oxygen partial pressure p(O2), and thus that of the oxidation state of FeOx, is crucial for a proper modeling and assessment of the state of industrial BOF slags. With an increase in p(O2), a considerable increase in lime saturation for both quasi‐ternary systems is observed and a shrinkage in the silicate saturation regions for the CaO–FeOx–SiO2 system occurs. The consequences of the findings for the industrial process are discussed. Mathematical descriptions of the dependency of lime saturation on temperature and oxidation state of FeOx in the ternary systems are provided.
