Advanced Materials Research Vols. 396-398

Abstract: The crystallization behavior of potassium vanadate from highly concentrated potassium hydroxide aqueous solution was investigated. The effect of various parameters including KOH concentration, V₂O₅ concentration, final crystallization temperature, cooling rate, stirring speed and additive amount of seed were examined. The optimal experimental conditions for K₃VO₄ crystallization were obtained as follows: KOH concentration 800850 g/L, KOH-to-V₂O₅ mass ratio 8~9, stirring speed 200 r/min, crystallization temperature from 80°C to 40°C with natural cooling, and seed addition 2% wt. Under optimal conditions, the K₃VO₄ crystallization yield of 87% was obtained, and the purity of crystals was about 90%.

Abstract: On the basis of low permeability exploiting statement, “Exploding in fracture” is present in this paper and the feasibility and safety of this technology is also analyzed. It is found that the rock damage and fracture by shock wave in “Exploding in Fracture” can be simulated by the experiment of exploding on the surface of the cement sample in deep water. The damage and fracture of the cement sample, and the wave propagation proceed, and the damage and fracture mechanism are described qualitatively. It is found that the micro-fractures and compacted wave have an intimate relationship with the initial damage of the sample. The numerical simulation result is accordant with the experiment result. It also concluded that the qualitative explanation of rock damage and fracture mechanism is right. The compacted damage zone has definite permeability, which has an important means to “Exploding in Fracture” technology.

Abstract: The flow in the burner is impacted by many factors, including the big bulk of the modern hot-blast stove, complex pipeline and too many valves. The length-width ratio of internal-combustion hot blast stoves is so high that non-uniform velocity distribution is easily brought forth along its length. Considering a real burner, a 1:5 scale model is established in this paper. The impact of the deflector on the velocity distribution of the nozzle exit is analyzed in the experiment, providing a basis for practical engineering design.

Abstract: The component fluxes and separation factors of the two binary systems CO2/CH4 and n-butane/isobutane through a defect-free silicalite-1 membrane were measured and modeled by the generalized Maxwell-Stefan (GMS) equations. For a mixture of CO2 and CH4 through the zeolite membrane, the GMS equations in combination with the Ideal Adsorbed Solution (IAS) theory for the mixture adsorption appropriately describe the component fluxes. On the other hand, this model cannot predict the permeation behavior of a mixture of butane isomers. In the current study, the proposed model based on the GMS equations combined with the Binary Dual-site Langmuir (BDSL) for the adsorption of butane isomers on silicalite-1 successfully simulates the permeation fluxes and separation factors.

Abstract: The running of the two centrifugal fans is widely used in the industry process. Based on the tested performance of the signal fan, the experiment study on the two fans in series is carried out. According to the experiment, the paper gets the characteristic curves between flow and total pressure、between flow and power、between flow and efficiency, It can provide the experimental basis for the parameter selection of the fans in series.

Abstract: The evaporation rate of histidine-water system was measured and the influence of pressure, temperature, His concentration, pH value of solution and the existence of NH4Cl salt was investigated. The results showed that operating pressure and temperature have significant influence on evaporation rate. Increasing vacuum and temperature could increase the rate. In contrast, the rate value was insensitive to the change of concentration of His, solution pH value and the existence of NH4Cl salt at the operating pressure and temperature. In connection with the operating conditions, properties of the research system and evaporation vessel geometry factors, a new mass transfer coefficient model, based on the dimensional analysis of experimental data, was proposed with relative error of ±10%. Check results showed that agreement between model predictions and experimental data is quite reasonable. The results obtained appear to be used to predict evaporation rate of histidine-water system for industrial reference.

Abstract: In order to satisfy the actual needs of training for employees in mine enterprises, finger oral focuses on accurate position operation and safety confirmation and can effectively solve the problems such as inadequate enthusiasm in training and low training effects. On the one hand, this paper discussed the rationality of adopting finger oral in employee’s internal training from three aspects such as operability, applicability and economic benefits. On the other hand, from psychological stability and standard and rigorous movements’ point of view, this paper demonstrated the actual effects of finger oral in mine industry. In addition, based on propaganda, comprehensive survey and field direction, this paper gave a systematic analysis of the implementation measures of figure oral in mine industry.

Abstract: The numeric method of the total quantity of ineffective reflux on tower top of binary batch distillation of total reflux and top accumulation under and ideal operation conditions is introduced. Energy consumption of binary batch distillation under total reflux and top accumulation is analyzed using the calculated results of examples，and a conclusion that, for the separation task that the low-efficiency energy consumption is large in proportion to its total energy consumption , its total energy consumption is visibly reduced by making a reduction in the mixing level of flowing liquid in top vessel.

Abstract: Using coal fly ash from one thermal power plant in Ningxia, China as the raw material, aluminum hydroxide powder was successfully extracted by pre-desilication , calcination, dissolution and carbonation precipitation processes. The research results indicated that the mullite, Quartz and glass phase in the coal fly ash could be changed into NaSiO3, NaAlO2 and Na2CaSiO4 after the coal fly ash was treated by desilication and calcination. The SiO2and Al2O3 components in the coal fly ash were mainly separated by dissolving the calcined sample using water. The dissolution rate of Al2O3 from the calcined sample is 91%. The aluminum hydroxide powder extracted from the coal fly ash is bayerite with the particle size of more than 50m. The extraction rate of the aluminum hydroxide from the coal fly ash can be up to 83%.

Abstract: Wavelet neural network(WNN) was applied to predicate the cortisol solubility. The model consists of a multilayer feedforward hierarchical structure, and the flow of information is directed from the input to the output layer by using wavelet transforms to achieve faster convergence. By adaptively adjusting the number of training data involved during training, an adaptive robust learning algorithm is derived for improvement of the efficiency of the network. The neural network was trained and simulated cortisol solubility with different input and output parameters. Simulation results confirmed that this approach gave more accurate predictions solubility.