Advanced Materials Research Vols. 712-715

Abstract: The purpose of this paper is to simulate the residual field of laser brazing by FEM of ANSYS. The 2-D coupled field element is elected to create finite element model. The brazing experiments have been done by means of 45steel which is the matrix and Ni-Cr solder and the residual stress of the diamond wheel has been measured by Raman method. The results of measure show that the maximum stress value is less strength of diamond. The residual stress distribution is basically identical between the results of simulation and experiment. According to this paper, it is possible to decrease the costs of study by selecting reasonable processing parameters on laser brazing.

Abstract: Oolitic hematite is one of the most refractory iron ores with complicate mineral compositions and abundant reserves in China. The hematite and limonite in the ore integrate closely with fine particles of collophanite, quartz, chamosite, calcite and chalcedony to form concentric ring structure, making the separation of the minerals extremely difficult. Since the tiny hematite crystal can not be liberated during the grinding of the ore the beneficiation can only be accomplished by recovering iron minerals aggregate with hematite as the major component. The previous research results showed that reverse flotation with fatty acid collectors could remove liberated phosphate minerals but not the quartz, chlorite and silicate minerals. This was because the gangue minerals such as quartz were contaminated by iron on the surface and there were high content of iron in some silicate minerals and high content of silicon in iron minerals, causing the floatability difference between the silicon and the iron minerals very small and thus the separation efficiency very low. Experiments were conducted to beneficiate the ore by reverse flotation with different cationic collectors. The results indicated that the flotation separation efficiency with most cationic collectors such as dodecylamine, ether amine, GE601 or GE609 was not satisfactory. However, a novel cationic collector for silicon removal, EM506 was found to be specifically selective to separate the gangue minerals from the iron ore with an increase of TFe grade from 49% to more than 58% and a recovery of TFe greater than 96%, which provided a promising approach for the beneficiation of the refractory oolitic hematite ore.

Abstract: The technology, device current situation , theory ,applied prospect of cross-flow solid-liquid separation have been summarized. It has been studied to making several cuneiform slots on the rotator of traditional crossflow filter, allowing the rotator forms convergence space with canister's inside wall. When suspending liquid fill into the cuneiform convergence space, it will cause kinetic press and improve the efficiency of filtrating. .

Abstract: According to the distribution of void fraction in water model of continuous casting mold, the influences of bubble size, water flow rate, and air flow rate on distribution of void fraction were studied by quasi single-phase model. The results indicated the distribution of void fraction generally showed a garlic shape. Both of the bubble diameter and the water flow rate have great influence on the distribution range of void fraction. Specifically the distribution range of void fraction increased with water flow rate and decreased with bubble diameter. And the gas flow rate has little effect on the distribution range of void fraction. The experiment results verified the authors model.

Abstract: It is known that oxidation is one of the most common ways for penlandite to be introducted into tailing during traditional coarse-particle sulfide flotation. However, it could become much more complicated and challenging problems for the low-grade, fine-disseminated Cu-Ni sulfides containing Pt and Pd in Yunnan Mine, accompanied with more than 75% of the content of MgO in the ore sample is. Direct flotation tests had been conducted to extract the metallic values as much as possible by adding traditional depressants and collectors, such as carboxylmethyl cellulose, starch, sodium silicate, butyl xanthate, (BX), butyl ammonium dithophosphate (BA) and etc., the relatively satisfied recoveries of Cu, Ni, Pt and Pd in the concentrate from bench flotation tests were obtained, however, more than 30% of metallic values still lost in the slime. In this study, bench flotation tests for the ore sample fromYunnan Mine, micro-flotation tests of serpentines and pentlandite from Jinchuan Mine and their settling rate tests were conducted to figure out how the oxidation influence the recovery of the ultra-fine nickel sulfide. All the tests results pointed to the presence of over-oxidation on the ultra-fine nickel sulfide surface and lead to the loss of Ni containing Pt and Pd in the slime tailing. Some methods which tried to slow the speed of oxidation on mineral surface during grinding and flotation were introduced in order to recover the values before over-oxidation of sulfides; however, the slime coating of serpentines also may play an important role in disturbing the floatability of ultra-fine sulfide.

Abstract: The low-grade feldspar from kyanite tailings were studied through the magnetic - Anti-flotation purification method. The ore grade of iron was decraded from 0.98% to 0.09% and e the various factors in the test was studied.

Abstract: Determine the best formula of the double excitation inorganic adjustable plugging agent: 15% slag + 0.8% activator + 4% dispersant + 2.5% retarder, with a curing time of 32h, and a curing strength over 1.4Mpa. The initial viscosity of adjustable plugging agent is 36mPa.s, and after curing for eighteen hours in 85 degrees Celsius , viscosity is less than 320mPa.s. For cores with different permeability, the water plugging rate of adjustable plugging agent is more than 90%.

Abstract: This paper tries to sum up every development indicator of the deep oil profile control and displacement effect evaluation in the oilfield, through the study of evaluation method in terms of the deep profile control and displacement effect, it establishes a set of index systems as for the deep oil displacement effect evaluation, including the injection well and production well and blocks these three aspects. It aims to make up the software for the deep flooding effect evaluation, H-12 Well is tracing software with the help of software, and the results show that the flooding effect of H-12 Well is obvious.

Abstract: Germanium technology chain is technically interdependent between germanium intra-industry and industry, as a technical interface between the "chain", it's a series of processes between germanium intra-industry and related industries for the products or services of the final transaction the germanium. Yunnan has initially formed set germanium mining, deep processing, research and development of more complete integration of germanium technology chain. But Yunnan downstream processing technology chain only extended to the end products, accessories production. And the high value-added end products do not yet have the production technology to build a competitive technology chain. Therefore, Yunnan has to improve the technical level of the prior art chain, integrated innovation of technology chain, the introduction of the end-product technology chain, vigorously develop the build germanium manufacturing technology chain, development germanium reverse reuse, recycle, recycling and environmentally friendly processing technology chain positively .So that Yunnan technology chain can be developed and improved very well.

Abstract: Directional solidification is one of the most important processes to purify the impurities in the metallurgical grade silicon. A lot of factors could influence the result of directional solidification. In this paper, we researched cooling water flow which could influence the result of directional solidification. We have studied three data of cooling water flow which influenced the results of the removal efficiency of the impurities. Experimental results showed that cooling water flow can influence the density of dislocations and twins in the ingot. The metal impurities of Al, Fe and Ca were concentrated in the middle of the silicon ingot mostly. It was inferred that the bigger cooling water flow was better to the efficiency of the purification in the experiment.