Abstract: Vanadium slag is a kind of common furnace slags in the metallurgical field that contains rich vanadium oxides and iron oxides. The high value added utilization of vanadium slag was exploratory studied in this paper. Under the existing experimental conditions, chemical reactions conducted between vanadium slag and concentrated sulfuric acid. Vanadium titanium catalyst was prepared with the lixivium (whose main ingredients were 44.42% of V2O5 and 29.36% of TiO2), which could meet the demand of industrial production; zeolite 4A was prepared creatively with leach residue of vanadium slag for the first time and its feasibility in CO2 capture was verified via detecting the CO2/N2 adsorption capacity. It is feasible to recycle solid wastes efficiently, reduce the environmental pollution and promote the development of CO2 reduction technology by this means.
Abstract: Laterite nickel ore is a kind of abundant and low-cost ore. In order to obtain the cheap and high-performance adsorption material, this paper addresses that Zeolite 4A was synthesized by laterite nickel slag, based on two-step hydrothermal synthesis procedure and alkali-melting process. The crystallization degrees of different kinds of Zeolite 4A were explored under different ratios of the reactants. Optimal condition was found out for synthesis of Zeolite 4A, including the ratios of the reactants. Finally, Zeolite 4A obtained under the optimal condition was tested by XRF, NOVA 1200e physical adsorption analyzer, and SEW separately, which confirmed its high purity and complete crystals. Finally, separation of CO2/N2 by Zeolite 4A using STA409PC Physical adsorption instrument was studied, revealing good adsorption selectivity which became lower with rising temperature.
Abstract: Bi2S3 flowerlike patterns were synthesized via a facile hydrothermal approach without using any surfactant and acid. The morphology, structure, phase composition, of the as-prepared Bi2S3 products were characterized using scanning electron microscopy, X-ray diffraction, high-resolution transmission and electron microscopy, respectively. The experimental results showed that the product possesses good distribution of morphology, well crystallized nanostructure.
Abstract: This paper presents a comparative study of the performance of ferrate (VI) towards wastewater treatment. The effects of solution pH, reaction temperature and amount of ferrate on the eosin removal rate were investigated. Results demonstrated that increasing the amount of ferrate (VI) and low acidity leads to good removal performance of ferrate towards eosin. So ferrate (VI) is an effective reagent for dyes treatment. The reaction temperature, however, has little influence on the removal rate which may be due to the degradation effects of ferrate at elevated temperatures.
Abstract: Under the same cement content, the stabilized soils, made of the soils with similar physical properties, may be significant difference in the strength. In this research, three groups of soils were selected, and the soils in each group are similar in physical properties. Strength and ions concentration in pore solution of the stabilized soils were investigated. The result reveals that calcium hydroxide (CH) concentration in pore solution of the stabilized soils might not reach to saturation due to soil consuming Ca2+ and thus cause calcium silicate hydrates gels (C-S-H) and calcium aluminates hydrates gels (C-A-H) to form less. The cementitious hydrates are the main strength contributors of the stabilized soils. The Strengths of stabilized soils, the soils bearing similar physical properties, were almost identical as long as the CH concentrations in pore solution were saturated. The effect of chemical factors of soil on the strength of stabilized soil can be briefly attributed to the change of CH concentration in pore solution, and be further attributed to the influence of CH concentration on the amount of C-S-H and C-A-H formed in stabilized soils.
Abstract: This article describes the research and development with the international advanced level of the screw separator, mainly used for the cleaner tailings fiber and the wastewater recycling and the use of stand-alone concentrated effect, into the plasma concentration of more than 0.5%, themaximum slurry concentration up to 60%, the device uses a unique control mechanism, without the power consumption will be able to achieve the automatic control of the plasma concentration, can efficiently remove moisture, recycled fiber, conservation of resources.
In pulping process,it will produce a certain amount of waste residue, also known as tailings. The tailings contain a large number of moisture content and fiber. Now, stacked tailings of many enterprises are in the outdoor. Severe pollution caused by a lot of stacked tailings, which don't do process.Loss of water and fiber caused great waste to the enterprise. To draw lessons from foreign advanced technology, it will design and develop the screw separator with advanced level at home and abroad, mainly used for the cleaner tailings fiber and the wastewater recycling. The current domestic pulp manufacturers don't do process tailings, direct discharge away, which is no processing equipment. So the development of the screw separator will fill the domestic blank.
Abstract: The aim of this research is to improve the hot corrosion resistance of In718 superalloy by laser shock processing. Specimens were treated by laser shock processing on the whole surface. The hot corrosion resistance beneath molten Na2SO4 under 900 °C was investigated. The effects of laser shock processing impacts on residual stress, surface microstructure and microstructure after hot corrosion test were investigated. Results show that 3 times laser shock processing can induce-400 MPa compressive residual stress. The microstructure was characterized by highly tangled and dense dislocations and a large number of twins. The average corrosion rate of In718 superalloy treated by laser shock processing is about 50 % lower than that of the untreated superalloy.
Abstract: Fluorene is a basic chemical raw material, which has wide applications.This paper introduces the current fluorene technology of extration and purification from wash oil. Use the after-cut of wash oil as raw material, get fluorene by distillation and solvent crystallization. The content of fluorene is higher than 97%.The total yield is 72.24%, which is higher than current domestic production levels.
Abstract: In2O3 nanopowder was successfully synthesized using microwave-hydrothermal method; by a very simple fast reaction between InCl3 and urea in aqueous solution contain 1% polyethylene glycol. The products were characterized by the techniques of X-ray diffraction (XRD), Scanning electron microscope (SEM) and Fluorescent spectrum. The result shows that as-prepared In2O3 nanopowder is cubic phase, the morphology is square composed of many particles.