Papers by Author: Yi Min Zhu

Abstract: Nano-Fe₃O₄ powders were prepared by chemical co-precipitation method. The granularity, morphology and absorbing properties of the magnetite nanoparticles were characterized by XRD, SEM, TEM and complex permeability. The effects of organic additives to the granularity, morphology and microwave absorption property of nanosized magnetic Fe₃O₄ were studied. The results show that the organic additives have great influence on the morphology of nano-Fe₃O₄ particles. Spherical nano-Fe₃O₄ is prepared by oxalic acid. And the absorption property of nano-Fe₃O₄ is better.

Abstract: In this paper, uses composite template, through the hydrothermal synthesis of mesoporous zeolite, and N2 adsorption specific surface area measurement instrument, scanning electron microscopy ( SEM ) on mesoporous zeolite pore size, morphology characterization, the crystallization pressure, crystallization temperature, crystallization time on mesoporous zeolite pore size, specific surface area, morphology of the impact. The results show that : the selection of P123 composite beer yeast as template agent, under the condition of high pressure crystallization ( control crystallization pressure 2.3MPa ), crystallization temperature of 110°C, the crystallization time is 72h, prepared by 10nm, specific surface area pore size of 400m2 / g mesoporous zeolite.

Abstract: In this paper, the natural zeolite as raw material, zeolites was prepared by organic amines hydrothermal synthesis. The results are characterized by SEM and nitrogen adsorption / de-commanded test,and study the influence of the aging time, crystallization temperature and crystallization time on zeolite crystallization. The results showed that using natural zeolite as raw material and butylamine as templating agent, average pore size of 0.77nm, the relative crystallinity of 96.34% of the zeolite was prepared in the hydrothermal system. Optimal aging time is 12h, crystallization time is 48h, crystallization temperature is 170 °C.

Abstract: The infrared absorption behaviors of nano-MgO with different sizes have been investigated based on XRD and IR data. The blue shifts of infrared absorption peaks with the decrease of the particles size have been analyzed by constructing one-dimensional vibration model. Adopting the quantum physics analyzed method, we provide the reasonable explanations for the red shifts of infrared absorption peaks as the average particle size of nano-MgO powder is down to less than 50 nm.

Abstract: In this paper, the preparation of mesoporous zeolite by template method is studied that the mesoporous zeolite is made up of pure silica source and pure aluminum source. The synthesis mechanism of mesoporous zeolite is investigated according to the characterization results of FTIR, SEM and N2 adsorption-desorption. The results shows that the water glass and sodium aluminate as the partial raw materials of synthesis process, P123 as the template, reaction at 42°C for 20h, aging at 54°C for 48 h, calcining at 550°C for 5 h. The average pore size of prepared mesoporous zeolite is 6.4nm and the specific surface area is 394.65m2/g. The FTIR shows that the microstructure of the prepared samples is similar to zeolite ore, and the SEM result indicates that the micromorphology of the product is uniform and pore size is within the mesoporous range.

Abstract: Selective grinding of bauxite with ratio of Al2O3/SiO2(A/S) 4.4 at ball mill were studied in order to investigate the effect of grinding media characteristics on selective grinding of bauxite. Results show that when diameter of ball media is Φ15mm, selective grinding effect is best and at this moment A/S of the product at -0.5+0.28mm granularity is up to 7.5. Ball/powder weight ratio, charge rate, and size composition of grinding media have little influences on particle size composition of powder product, but have great influences on the A/S at different granularity powder product. At condition of size composition of grinding media Φ30mm:Φ20mm:Φ15mm＝20%:50%:30% and charge rate 40%, the grinding results are best and at the moment ωAl2O3/SiO2 is up to 7.5, yield 27%, and Al2O3 recovery 30%.

Abstract: Nano-MgO powders with different size form 30 to 100 nm are prepared and measured by XRD and IR. FTIR results show that nano-MgO powder has abnormal infrared absorption behaviors compared with that of micron scale; and there exist blue shifts of infrared absorption peaks with the decrease of the particles size. But when the average particle size of nano-MgO powder is down to less than 50 nm, there are red shifts of infrared absorption peaks. The aim of the paper is to analyze the mechanism of IR absorption characteristic of MgO Nano-powder by a single- dimensional chain vibration model.

Abstract: Due to lignite is a kind of coal with low degree of coalification, low heat value, high moisture content, and prone to weathering and spontaneous combustion, it is not easy for long distance transport. The briquette technology is an effective way to resolve this question. In this study, the lignite from Huolinhe Coalmine was taken as the raw material. By drying it and adding agglomerant into it and letting it go through the physiochemical process, a lignite briquette with improved heat value and some strength was produced, which solved the problems like heat value reduction and the environmental pollution caused by weathering during the lignite transport process, and increased the economic and social benefit of lignite utilization. This study used the agglomerant cold-press molding technique to prepare the briquette, the obtained briquette went through the tests of ash content, heat value, compressive strength, surface behavior etc., and the test results then were analyzed. Meanwhile, this article discussed the acting force types of the particles inside briquette and influencing factors of lignite molding from the point of agglomerating mechanism. The optimal agglomerant type and blending ratio of the agglomerant was determined, which will provide basic consideration for the industrial production of the briquette.

Abstract: Aimed at the status in China there are still some people who drink the water with excessive concentration fluorine, what may seriously threat to human health. For example Fuxin is an important production base in Liaoning province, which products aromatic compounds of fluorine. We found that the wastewater had large fluorine ion by testing the wastewater from the plant. It was polluted XiHe River and harmed to people’s health. So we chose the fly ash of Fuxin Plant as the agent to eliminate fluoride，then studied the mechanism of fluorine-removal and the physical properties of fly ash. Eventually we adopted the activation methods and combined the dynamic experiment and static experiment to research the mechanism to eliminate the fluorine with fly ash. The results of the experiment showed that the technology route was feasible which used the modified fly ash to get rid of the fluoride in the wastewater and reached the national emission standards.

Abstract: A precipitation-pyrolysis process was used for the synthesis of cubic nano-MgO powder. The main effect factors on the size and shape of nano-MgO powder such as mechanical stirring rate, organic reagent, and calcinations of the process were investigated. XRD and TEM were used to study on composition, morphology and size of nano-MgO powder. The results indicate that at the condition of mechanical stirring rate 510 rmp, glycol as organic crystal controller, calcination time 3 h, cubic nano-MgO powder was prepared with average size of 35 nm. FTIR results show that cubic nano-MgO powder has abnormal infrared absorption behaviors compared with that of micron scale.