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to the presence of surface oxide film [16]. Moreover, uncontrollable formation of TiAl and TiAl3 intermetallics caused by direct contact of Al and Ti in the solid-state diffusion bonding is a main problem. When... of direct contact of Ti and Al in the process and the higher bonding time compared with TLP bonding, the formation of various intermetallic compounds such as TiAl, TiAl3 and Ti3Al is expected, while in TLP......
]. However, it is usually difficult to synthesize Mg2Si by direct mechanical milling due to the stable oxide films formed on the Mg particles [4]. The present study focuses on the effect of Si addition... lattice strain and crystallite size reduction [15]. The absence of Zn and Si peaks in the XRD pattern could be due to their low concentrations. The peak shifting of Mg reflections to higher 2θ values......
and feldspar in the direct flotation stage would cause some reduction in V2O5 recovery. Besides, hematite of which average size is less than 20 μm is often associated with the fine mica, so it is more... and collector were added. Two-stage flotation experiments were carried out containing reverse and direct flotation. The detailed conditions and process flowsheet are given in Fig. 1. The flotation......
not suit the separation and extraction of molybdenum and nickel from the ore. The traditional process for molybdenum and nickel extraction from Ni-Mo ore is oxidizing roasting and melting reduction... other processes have been proposed to recover molybdenum from Ni-Mo ore, such as direct leaching with NaOH and NaClO [6], oxygen pressure NaOH leaching [7,8], roasting followed by NaOH and Na2CO3......
after reduction 由表8可知,还原渣中三氧化二砷含量达到了98.9%,符合YS/T-99-1997AS2O3-2号产品标准.由图6可知,还原产物为三氧化二砷.由表9可知,滤液中含As,Cu,可返回沉淀处理. 2.5.2 蒸发结晶提取三氧化二砷 每次取含不同硫酸浓度上述滤液200 mL,在搅拌状态下蒸发至50 mL,冷却结晶,过滤,取滤液检测其中成分,所得结果如表10所列. 表10..., CUI Tao. Reduction and deposition of arsenic in copper electrolyte[J]. Transaction of Nonferrous Metals Society of China, 2011, 21(12): 2772-2777. [9] 刘锐平, 李 星, 夏圣骥, 武荣成, 李圭白. 高锰酸钾强化三氯化铁共沉降法去除亚砷酸盐的效......
are fumed off and are collected with particulate matter in the off-gas cleaning system [1,2]. EAFD contains mainly Zn, Fe, Pb and a considerable amount of harmful elements, such as Cd, As, Cr and F.... In pyrometallurgical processes, such as carbothermic reduction, the low-grade zinc in the residue leads to high energy consumption [6], because these processes require high heating of gangue......
), 2009, 40(1): 48-54. ZHENG Ya-jie, LUO Yuan, WANG Yong. Preparation of arsenic trioxide by arsenic trioxide reduction precipitation method[J]. Journal of Central South University(Science and Technology... and Surface A: Physiochemical and Engineering Aspects, 2011, 379(1/3): 116-120. [17] ZHOU Wen-ke, PENG Ying-lin, ZHENG Ya-jie, MA Yu-tian, CUI Tao. Reduction and deposition of aesenic in copper electrolyte[J......
or nitrate ions and the oxygen reduction reaction (ORR) process [8,13,14]. The ROS could cause mineral lattice distortion and cause catalytic oxidation of metal suboxides in the ore. All... are capable of oxidizing the metal suboxides directly. On the other hand, fundamental studies have suggested that the reactive oxygen species (ROS) obtained from oxygen reduction reaction (ORR) in SMS......
using optical metallography (OM, GX71, Olympus, Japan), and scanning electron microscopy (SEM, SU4800, Shimadzu, Japan). The worn surface was observed after 30 min ultrasonic cleaning to remove most... given by Eq. (3). This method could be effective for prohibiting a direct contact between SiC preforms and the Al alloy matrix to form Al4C3. Thin SiO2 layers formed on the SiC preforms are shown in Fig......
minerals. Microorganisms can oxidize metal sulfides via a direct mechanism where electrons are obtained directly from the reduced elements. In this case, cells have to be attached in close contact... are microbially re-oxidized. In this case iron acts as an electron carrier. It was proposed that no direct physical contact is needed for the oxidation of iron [2]. Under acidic conditions metals are extracted from......