Advanced Materials Research Vol. 968

Abstract: The effect of ZnO dosage, iron remover and the time duration of neutralization and iron-precipitation on iron removal percentage was investigated to find out the optimal parameters in the technique of ZnO pressurization, neutralization and iron removal, and the residual acid from pressurization lixiviation and neutralization was assayed by using ZnO ore to neutralize and remove iron from lixiviated mineral pulp containing residual acid 20 g/l by simulation of Zn concentrate pressurization and lixiviation in a 2 L autoclave, in order to simplify Zinc pressurization process. The result showed that when Zn lixiviation percentage is higher than 98 %, up to 99.74 % of iron in the lixiviation fluid could be precipitated and the lixiviated fluid contains iron at the level of 20 mg/l, meeting the requirement on pre-purification fluid. Keywords: Zinc Sulfide Concentrate; Pressurization and Lixiviation; ZnO Ore; Neutralization and Iron Precipitation

Abstract: By FEA method, the bending of the copper alloy thin-plates by continuous laser forming (CLF) and pulse laser forming (PLF) was studied. Based on the analysis of dynamic change and steady distribution for the fields of temperature, stress/strain and displacement, the forming mechanism and rule of copper alloy by different laser modes were revealed. The whole deformation of PLF was the additive effect of all impulse action, while CLF mainly was the result of thermal stress. To get the same deformation, laser pulse energy is about 6 times of the continuous laser，CLF is suitable for larger deformation demands, and PLF is more seemly for micro-forming.

Abstract: This paper analyzed the deoxidation principle of new-type compound deoxidizer, Si-Al-Fe alloy during stainless steel refining, summarized related studies on deoxidizer behavior, deoxidation products, alloying treatment by workers in the metallurgical in recent years, analyzed to solve a series of problems caused by deoxidation product with high melting point, and pointed out that it was a trend for large-scale production of "zero" inclusions steel or rendering inclusions harmless and functional.

Abstract: A simplified model is developed to predict axial gas and product temperatures along tunnel kiln with neglecting cooling zone. The plate tunnel kiln is simplified as a counter current heat exchanger. The model is solved by Finite Difference Method. Mass and energy balance equations of gas and solid in elements are derived, which consider convective and radiative heat transfer from gas to solid. Equations of elements are solved continuously from kiln ending to beginning, in which two boundary conditions are adiabatic combustion temperature and product sintering temperature in the last element. The results of a standard case and a fitting case are discussed and compared with data from an existed kiln. The standard case proves Lorenz’s Nusselt function is more accurate than infinite flat plate Nusselt function for convection description in plate tunnel kiln. The fitting case proves this simplified model is available.

Abstract: Yellow reactive dyes containing the benzimidazolone group were synthesized by a diazo-coupling process based on 5-aminobenzimidazolone and 2,4-diaminobenzenesulfonic acid. These reactive dyes were subsequently used for cotton dyeing. The structures of the dyes were confirmed by mass spectrometry, Fourier-transform infrared spectroscopy, and proton nuclear magnetic resonance spectroscopy. The dyes demonstrated satisfactory light stability when exposed to simulating light. The results of cotton dyeing showed that the exhaustion and fixation of dyes were reasonably effective and acceptable as ‘low-salt-dyeing’ dyes.

Abstract: High gravity technology is an efficient process intensification technology. Its applications in the chemical, materials and other industries have been relatively mature. The basic principles, characteristics and development of this technology are firstly summarized in this paper. And then, its basic theory researches and engineering applications are comprehensively analyzed. Finally, aiming at the liquid extraction problems in metallurgy industry, the application prospects and problems to be solved were put forward.

Abstract: Nowadays, steel industry develops rapidly. However, lots of iron ore needed by China’s steel industry are imported from abroad. China’s dependence on foreign iron ore exceeds 70%. As a result, not only have large amounts of foreign currencies been spent but also a potential threat has been posed to the economic development of our country. Therefore, it is necessary for China to serve its economic production with lots of low grade iron ore. Since traditional beneficiation methods can cause serious environmental problems, High gradient magnetic separation(HGMS) is discussed in this paper. It can recycle tailings when disposing of low grade iron ore as well as solve the environmental problems caused by tailings and arising during the production process. Besides, high gradient magnetic separator can also raise the processing efficiency of low grade iron core. Therefore, high-gradient magnetic separation can not only increase economic returns but also protect ecological environment. With the maturity of super-conduction high gradient magnetic separation technology, super-conducting high gradient magnetic separation will produce better production effects.

Abstract: Regarding to a Low-grade refractor copper ore，this paper investigates the property of run-of-mine ore，and based on the characteristic of raw ore，mineral process experimental study is implemented. It can realize the copper concentrate grading at 15.84%with a 87.04% recovery through the bulk flotation with Cu-S separation process.

Abstract: A representative gold ore sample subjected in this work was taken from Guangnan gold mine, Wenshan municipality, Yunnan province, China. The ore sample assays 2.21 g/t Au, and the gold element exists in oxides, sulfides and silicates. Detailed tests as flotation and leaching were conducted in order to make good use of the valuable element. A flotation concentrate which assays 19.48 g/t Au is obtained through a flotation process of one rougher, two scavengers and two cleaners under the grinding fineness of 90% -0.074mm. The flotation concentrate with rich Au content is a high quality feed for metallurgy. And the flotation tailings were subjected to leaching. After 24 hours, the leaching rate reaches 90%.

Abstract: A tailings assaying 0.4% Sn is taken from a flotation process which is used to recover Cu, Pb and Zn. The cassiterite in the tailings is of fine dissemination and complex composition, which leads to difficulties to recover by traditional gravity concentration. In order to enhance the recovery of Sn and make good use of the tailings, particle size analysis and chemical analysis were conducted. Test results show that different flotation index under different size range can be obtained, and the flotation behavior of different size range was investigated. As a result, a reasonable process of gravity concentration and flotation after classification is proposed, which can enhance the Sn recovery remarkably.