8th International Symposium on High Temperature Metallurgical Processing: Alloys and Materials Preparation
Sponsored by: TMS Extraction and Processing Division, TMS: Pyrometallurgy Committee
Program Organizers: Jiann-Yang Hwang, Michigan Technological University; Tao Jiang, Central South University; Mark Kennedy, Proval Partners SA; Onuralp Yücel, ITU; P. Chris Pistorius, Carnegie Mellon University; Varadarajan Seshadri, Universidade Federal de Minas Gerais; Baojun Zhao, The University of Queensland; Dean Gregurek, RHI AG; Ender Keskinkilic, Atilim University
Tuesday 2:00 PM
February 28, 2017
Location: San Diego Convention Ctr
Session Chair: Onuralp Yücel, ITU; James Cox, UTRS Inc.
2:00 PM Introductory Comments
Development of a Novel, Low-cost Titanium Extraction Process for Bulk or Powder Applications: James Cox1; Chanaka De Alwis1; Benjamin Kohler1; Mike Lewis1; Matthew Call1; Julia Kluck1; Amelinda Olson1; Marc Snyderman1; 1UTRS Inc.
UTRS Inc. has developed a novel two-step method to extract commercially viable titanium alloys (patent pending no. 20130164167). This approach has proven its potential to produce a variety of titanium alloys (Ti-6Al-4V, TixAly, etc.,) and has demonstrated a number of advantages over the current commercial titanium production process. Additionally the UTRS process operates without producing CO2 and eliminates the use of TiCl4. Step 1: Aluminothermic reduction makes available many types of ores that could otherwise not be used. Due to the aluminothermic reduction technique and the composition of the ore, metal extracted from this step will inherently contain non-titanium elements. Step 2: Electro-refining removes undesirable elements from the thermally extracted titanium. This refined metal has a dendritic morphology with a wool-like appearance that is referred to as “titanium wool”. This new morphology of titanium allows it to have a diversity of end product types from titanium powder to bulk titanium.
Evolution of Non-metallic Inclusions in Solid Fe-Al-Ti-N Alloy during Heating: Hiroyuki Matsuura1; Wonjin Chio1; Gen Kamimura1; 1The University of Tokyo
Control of non-metallic inclusions in terms of morphology, number density or composition is essential to produce steel products having the desired mechanical properties. Though many studies have been conducted to clarify various properties and evolution mechanisms of inclusions at steelmaking temperature, it has been reported that the states of inclusions in final products are significantly different from those in crude steels for some steel grades.The present study has focused on the evolution of oxide and nitride inclusions in solid Fe–Al–Ti–N alloys during heating to increase the understanding of inclusion evolution in a simplified metal system. Compositional and morphological change of initial inclusions, as well as precipitation and growth of new inclusions have been observed even when the alloy was in a solid state. This behavior has been observed due to the change of thermodynamic stability and solubility of existing phases in inclusions.
Preparation of Low-carbon Ti2O3 by Carbonthermal Reduction of the Mixture of Titanium Dioxide and Activated Carbon under Vacuum Condition: Kejia Liu1; Yaowu Wang1; Yuezong Di1; Jianping Peng1; Xinzhong Deng1; Naixiang Feng1; Yi Zhang2; 1Northeasten University; 2Institute of Process Engineering, Chinese Academy of Sciences
Low-carbon Ti2O3 was prepared by carbonthermal reduction of the mixture of titanium dioxide and activated carbon at a vacuum condition. The kinetics and phases evolution of the Ti2O3 formation process were investigated using X-ray diffraction and gravimetric analysis and the microstructure by SEM. The only intermediate phase detected is Ti3O5.The duration of completely reduction shorted sharply to 4h when the temperature raising to 1300oC. The best molar ratio of activated carbon and TiO2 is 0.6 to 1. At this condition, the content of Ti2O3 in slag is up to 95.63 wt% and the content of the carbon element is below 0.004 wt%, which meets the requirements for the further preparation of metal Ti by FFC Cambridge process. At the same time, the microstructure of Ti2O3 generated presented porosity, which will promote the electro-deoxidation process extremely.
Pyrometallurgical Studies for Manganese Extraction Using Turkish Ore Reserves: Ender Keskinkilic1; 1Atilim University
Pyrometallurgical studies conducted for Mn extraction using Turkish Mn-ore reserves were reviewed. Turkish Mn-ores are low-grade ones having ~30%Mn. The most important Mn ore reserve in Turkey is Denizli-Tavas region, where more than 2 million tons of proven reserve was reported. Mining rights of Denizli-Tavas manganese belongs to Eregli Iron and Steel Works Co.(ERDEMIR). The ore is usually charged to the blast furnaces of ERDEMIR during hot metal production. So far, nearly 20 MS. Thesis studies have been conducted for the analysis of manganese extraction in Turkey. In the scope of present work, only pyrometallurgical and pyrometallurgical related (i.e. ore beneficiation, calcination, etc.) ones were examined. Among these, the ones dealing with treatment of a specific ore were reviewed.
3:25 PM Break
A Recommendation of a New Method of Ti and Ti-Al Alloy Production by Aluminum Reduction Na2TiF6: Feng Naixiang1; KUN ZHAO1; Jianping Peng1; 1Northeastern University
This paper presents a review of traditional Ti and Ti-Al alloy production methods, gives a new technology of Ti and Ti-Al alloy production by aluminum reduction Na2TiF6 and compares with traditional method. It is concluded that the new technology is a favorite with Ti and Ti-Al alloy production.
Trace Elements Behavior during the Oxidation of Liquid SiMn Alloy: Yan Ma1; Ida Kero2; Sarel Gates3; Gabriella Tranell1; 1Norwegian University of Science and Technology; 2SINTEF Materials and Chemistry; 3University of Pretoria
During the tapping and casting of manganese ferroalloys, fumes are generated and released to the working environment. The fumes are mostly composed of metallic oxides generated by reactions between high temperature molten metal and ambient oxygen in the air. From an HSE perspective, it is important to limit these emissions. However, to do so, it is important to understand fuming mechanisms and kinetics as well as their influence on fume composition, i.e element behavior during the oxidation process of liquid manganese ferroalloy. Silicomanganese are composed of a minimum of 65wt% Mn and 17wt% Si, 2wt% C as well as minor and trace elements. These elements include Fe, Ca, S and other elements originating from ore and reductants. Trace elements behavior from liquid silicomanganese alloy under an impinging air jet in temperature range of 1400-1700°C has been investigated in this work. Thermodynamic and kinetic conditions governing the generation mechanisms are discussed.
Effect of Microalloy Elements V And Mg on Organization at High Heat Input Welding Shipbuilding Structure Steel: Wang Yan1; Han Yihua1; Zhu Liguang1; Zhang Qingjun1; Wang Shuoming1; Zhang Caijun1; 1North China University of Science and Technology
An industrial test on 210t converter-LF-CC production line on high heat input welding shipbuilding structure steel DH36 has been taken in a factory in north China, the effect of adding microalloy elements V and Mg on casting billet microstructure has been researched, and it was found that when the composition of V was between 0.03%-0.05% and the composition of Mg is between 0.002%-0.005%, as-cast organization with a large number of acicular ferrite formed a net structure. The inclusions size which induced intra-granular ferrite are mainly less than 4 μm, especially those between 2 ~ 3 μm account for 50.80%, in these inclusions the composite inclusions mixed with Mg accounted for more than 60%.
Sintering Performance of Blends Containing High Proportion of Limonite Iron Ore Fines: Feng Zhang1; Deqing Zhu1; Jian Pan1; 1Central South University
Sintering performance of a series of sinter blends with high ratio of limonite iron ore fines was investigated. The metallurgical performance and mineralogy of product sinter were also examined. The results show that good sintering performance could be obtained when the ratio of limonite was below 43% in the blends of iron ore fines, while good microstructure and metallurgical properties were achieved under optimum sintering conditions. In contrast, sintering performance will rapidly deteriorate when the ratio of limonite is elevated up to 63% in the blends.