Papers by Author: Jie Lu

Abstract: This paper analyzed the grade of iron and sulfur of cobalt concentrate in an iron in the past decade. The utilization of the magnetic separation technology for treating cobalt concentrate was carried out the techno-economic analysis. It was indicated that the cobalt concentrate quality had been improved significantly after magnetic separation; the grade of cobalt has been increased for 0.08 percentage points higher and the sulfur 3 percentage points higher. The recovery operations of cobalt and sulfur were 83.1% and 80.6% respectively, and the product yield of the magnetic was 27.85%, the grade of iron was 42.63% and the sulfur was 17.76%. According to the actual production data in 2009 and the experimental data of magnetic treatment of cobalt concentrate, the benefits of treating cobalt concentrate were calculated. The results showed that 5.342 million was increased for the sales and more than 4.6 million was increased for net returns by the magnetic treatment of cobalt concentrate.

Abstract: A binary Cu–Ni alloy (69.93 wt. % Ni+Co) has been investigated as a potential inert anode in a laboratory electrolysis cell. When the electrolyte temperature, electrolyzing time and polar distance were set to be 960 °C, 4 h and 3 cm respectively, the corrosion resistance of Cu-Ni alloy materials in aluminum electrolyte was studied in the electrolyte composed of synthetic cryolite, alumina, aluminum fluoride, magnesium fluoride, calcium fluoride and aluminum by changing the molecular ratio of electrolyte, the concentration of alumina and current density of electrolyte, respectively. The results shows that the Cu-Ni alloy materials could reduce material loss when the electrolyte is with the optional conditions of the content of alumina in electrolyte approaching to 6 wt. %, the molecular ratio at about 2.2 and current density near to 0.5A/cm². Thus the corrosion ratio of Cu-Ni alloy per year was measured to be 1.27cm/a.

Abstract: In this study, eight water-quality indices, such as temperature, pH, colority, DO, BOD5, CODMn, NH3-N and TP, were monitored based on the water environment of Yulong River- the only landscape river in the central area of Zibo city. The water quality assessments of each individual parameter were performed. Results showed that Yulong River had already been eutrophicated. According to the current water qualities and environmental characteristics of Yulong River, an ecological complex filter plan was proposed to remedy Yulong River.

Abstract: Anaerobic sludge were cultured and acclimated by adding different co-metabolism substrates under six operating conditions, using chloroform as model contaminant in an anaerobic environment. The microorganisms obtained with chloroform biodegradability were concentrated and cultured before adding into the simulated decontaminating apparatus. The results showed that the chloroform could be degraded by the microorganisms under the anaerobic condition, and the addition of co-metabolism substrates could improve the biodegradation efficiency. Moreover, the biodegradation efficiency varied with different co-metabolism matrix. The removal efficiency of pollutants could reach 75% using the microorganisms acclimated with glucose and methanol as co-metabolism substrates.

Abstract: In this study, a comparison of appearance surface and fracture surface of mechanical plating was made, respectively formed by spherical Zn powders and Zn-Al compounding flake powders. It is found that the spherical particles are deposited and embedded on Zn plating. The deformation of granular Zn powders on coating superficial is relatively large, but there is little distortion of globe grain inside the coating, mainly with spheroidicity distorted. Besides, there are obvious gaps between the particles in Zn coating. In contrast, the flake structure granules of Zn-Al plating are densely and compactly laid out with small space. After contacting with air, the plating coat expands owing to aluminum oxidation, leading to the higher position of the plating coat on the cross section than the matrix metal. We then did salt mist test to verify the corrosion resistance of Zn-Al compounding flake coating. It was found that the Zn-Al compounding flake coating was superior to that formed by globe Zn powder. Results show that the addition of layers of flakes has a better shielding action resisting corrosive medium, leading to the decrease of the osmosis from corrosive medium to the coatings. And the coating can repair naturally after being damaged. We further passivate plating with molybdate to improve the anticorrosion of the coating.

Abstract: By using SnSO4 water solution to activate global granular Zn powders of 325 screen mesh, Zn-Sn composite coverage is formed under the action of mechanical impact of the tiny glass beads and work pieces. During and after the formation of coating, acid water liquor will react with metal basal body, and hydrogen gas is bound to emit from the pathway and form micro pores. In addition, there are bond areas between the new and the primary coverage, which may lead to the emergence of micro crack on the coating owing to such causes as too big or uneven impact during plating process, little distortion of global granular zinc dust inside the plating coat, less tight coalescent of the zinc dust flecks. These problems can be confirmed by SEM scanning coating surface and cross section pictures of plating coat. In our study, methyl hydrogen silicone fluid, titanium isopropoxide and benzinum are used as the basal components. This compound has such features as better osmosis for micro pores and cracks formed in the process of dual coverage, strong adhesive force, anti-contraction, high transparence and water proof property. The impact of titanium isopropoxide dosage on the solidifying speed of methyl hydrogen silicone fluid, and that of mechanical plating zinc coating on corrosion proof are studied. Through tests, the proper compound ratio is determined as 11:10:79 of methyl hydrogen silicone fluid to titanium isopropoxide to benzinum(90-120 Centigrade degree). Experiments indicate that when the coating thickness is 0.2 micron, the emergence time of white corrosion on the plating coat doubles, accordingly, that of red rust prolongs, this shows that the anticorrosion of the coverage can be significantly improved through superficial pore sealing in zinc plating coat.