Table of Content

13 June 2021, Volume 37 Issue 3

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Risk Assessment of Smelting Operation Based on AHP-LEC Method

LU Ping, ZHANG Jinliang, LIN You, NIE Qi, CHENG Yong

2021, 37(3):  1.  doi:10.3969/j.issn.1009-0479.2021.03.001

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Smelting is a high-risk industry in which there are many potential safety hazards. If a safetyaccident occurs, it will bring serious consequences to the life and property of enterprises and individualsIn order to improve the scientificity and objectivity of smelting operation in safety evaluation, function andanalytic hierarchy process (AHP) are introduced to amend the evaluation method based on the traditiona.LEC. After revising the values of L, E, C and D, they are applied to the risk assessment of aluminumand iron production in a smelting enterprise. The results show that the value of D calculated by the meth.od of AHP-LEC can better reflect the safety state of actual working conditions, which plays an effectiveguiding role in actual production.


Effect of Different Laser Energies and Zr/Ti Ratio on the Crystalization Quality of PZT Thin Film Prepared by PLD Method

LI Yingjuan, TENG Yu, SONG Qunling, YANG ZhihongCAI Chuanxiong, ZHANG Jinliang

2021, 37(3):  7.  doi:10.3969/j.issn.1009-0479.2021.03.002

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Pb(Zr_0.52,Ti_0.48)O₃, is a typical piezoelectric material. It can be used to prepare all kinds of piezoelectric devices because of its excellent properties, and it has been widely concerned by many researchers. PZT thin films with different compositions were prepared on SrTiO₃(100)single crystal sub-strate by PLD method. The effects of laser energies and Zr/Ti ratio on the crystallization quality of Pb(Zr_0.52,Ti_0.48)O₃, thin films were discussed. The optimum conditions for the growth of PZT films were obtained. The rocking curves of (002) were analyzed. The results show that the Pb(Zr_0.52,Ti_0.48)O₃, filmswith uniform surface and small root mean square roughness are obtained, reflecting better crystallization quality. The grain size of the film prepared in the 2 to 6 nm range according to the formula can be used indevice fabrication.

Effect of Plastic Deformation on Microstructure and Properties of Sintered Pure Titanium with Titanium Hydride Powder

LIU Jie, ZHANG Wenli, LI Yuexiwei

2021, 37(3):  13.  doi:10.3969/j.issn.1009-0479.2021.03.003

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Using TiH₂ powder as raw material, pure titanium with relative density more than 95% can beobtained through forming and one-step sintering. The elongation is 6. 67% and reduction of area is 2. 97%. In order to improve its plasticity index, the pure titanium bar with diameter of 5mm was pre-pared by rotary forging from the sintered bar with diameter of 20 mm x 200 mm. The tensile strength, e-longation and area reduction of the annealed bar were 431.26 MPa, 26% and 38.53% respectively. Theplasticity index of the annealed bar was 70% higher than that of the sintered bar, but slightly lower thanthat of the purchased annealed bar. Rotary forging provides a strong three-dimensional compressivestress. The micro pores and micro cracks in the sintered billets are not easy to gather and expand intomacro cracks, and the deformation mode which extends along with the two-way compression is easy to be-come less harmful line defects, and the material shaping is significantly improved.

Slope Stability Analysis of Large Open-Pit Mine with 2 Million t/a in Mankong Limestone Mine

LYU Linhong, XU Jiaqing

2021, 37(3):  18.  doi:10.3969/j.issn.1009-0479.2021.03.004

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Mankong limestone open-pit mine has a large mining depth and poor lithology. The stability ofstope slope is directly related to the normal operation of the mine, and it also affects the rationality of themine's deep extension mining design. Therefore , the analysis and evaluation of its slope stability is very im-portant. According to the engineering geological conditions and rock mass quality evaluation, FLAC andslide 6.0 software are used to establish slope model, calculate and analyze the slope stability of each subar-ea. The slope safety factors are calculated respectively under three working conditions: self weight, selfweight +blasting and self weight + earthquake. The results show that the slope of open pit mine end bound.ary is stable with some security reserve, and slope stability achieves the safety grade and meets require-ments of codes concerned in all working conditions, which illustrates that the slope structure parameters otthe end stope design is feasible and rational to some degree. At the same time, it is suggested that smoothblasting and presplitting blasting should be adopted when the slope is close to the slope design boundary.

Determination of Low Content Indium in High-Iron Sphalerite by Flame Atomic Absorption Method

LI Li, WANG Jinliang, NING Mencui , PENG Li, WU Wenbin

2021, 37(3):  26.  doi:10.3969/j.issn.1009-0479.2021.03.005

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In view of the complex composition of high-iron sphalerite and many interference factors for thedetermination of low-content indium in the ore, a flame atomic absorption method was established to determine the low-content indium in high-iron sphalerite. The detection limit of the method is 0.001 ugmL, and the concentration of indium sample is in the range of 0.01 ~ 10 ug/ml. It represents a linearrelationship with the absorbance value A and the correlation coefficient of the linear equation is 0. 999 93.The recovery rate of different spiked samples is 98. 1% to 101. 4% , and the relative standard deviation ofthe determination results of different content samples is 0. 34% ~0. 84%. The accuracy and precision ofthe method can thus meet the requirements.

Research Progress on Preparation of PbS Colloidal Quantum Dots

ZHAO Yiqun, WU Zhenfen, LI Wei, SUN Chengzhi, HUANG La​n, ZHAO Xudong

2021, 37(3):  30.  doi:10.3969/j.issn.1009-0479.2021.03.006

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In this paper, the preparation methods of PhS colloidal quantum dots are divided into threcategories according to the difference of Pb source and Sulfur source, and the comparison of these threpreparation methods is described. The commonly used modification methods are also described with therequirements of PbS application in different fields. In the end, the possible preparation and modificationmethods of PbS are proposed. t has a certain reference value for the preparation and application of PhSquantum dots.

An Experimental Study on Improving the Beneficiation Indexes of an Iron Ore

PENG Fenlan, ZHANG Hanping

2021, 37(3):  37.  doi:10.3969/j.issn.1009-0479.2021.03.007

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This paper studies on refining iron and reducing impurity of some other metallic minerals suchas magnetite, hematite, limonite and goethite in an iron ore in Thailand. The combined process ofgrinding-weak magnetic separation-high intensiy magnetic separation” can be adopted for the medium.5 mm particle size of the original ore. The final iron concentrate yield is 73. 59% , the iron grade is56.77% ，and the recovery is 81.31%


Application of Light Supported Hydraulic Support in Fully Mechanized Mining Face of Complex Mine Structure

MAO Jianing, LI Hongwei , WANG Shaoliu, GAO Kun

2021, 37(3):  43.  doi:10.3969/j.issn.1009-0479.2021.03.008

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There are some problems in moving house. For example, it is complex and time-consuming asthe traditional fully mechanized working face is parallel to the working face of coal wall or faults with anoblique fall greater than the mining height. Hydraulic support work face with integral roof beam combinedwith suspension will expand and the working face roof pressure will increase when meeting with water incarbonaceous mudstone floor. To effectively solve these problems , the current study replaces the wholetop beam with the light support hydraulic support, which addresses the problems above, and improvesthe technical and economic benefits of the enterprise.

Evaluation and Analysis on Goaf and Surface Stabilityin Yinachang Iron and Copper Mine

NIU Shuhui

2021, 37(3):  50.  doi:10.3969/j.issn.1009-0479.2021.03.009

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Yinachang iron and copper mine has been mined for a long time and a large number of mine goafhave been formed. In order to evaluate the stability of goaf and surface , The FALC3 finite difference numeri-cal software is used to simulate the influence of underground mining on its goaf and surface stability. The sim-ulation results show that because the roof and floor of the mine have good rock properties and the rockmass isstable, the plastic zone produced by the stope roof is limited after the full-scale excavation with retained pil-lars , the plastic zone is not penetrated to the surface, and the overall subsidence deformation of the surfaceand the stope roof is very small, which has no disturbing effect on the surface and meanwhile has certain secu-rity. The surface and goaf surrounding rock are in a stable state , which proves that the mining method has theadvantages of safety and low cost with certain feasibility and rationality. The research results provide a theo-retical basis for the safe and efficient production of the mine. The research results provide theoretical basisand technical guidance for safe and efficient mining of the deep ore body and safety of surface.

Geological Characteristics and Ore-Prospecting Indicators of Baimashan Lead-Zinc Deposit in Yingjiang,Yunnan

Dong Jiangtao

2021, 37(3):  54.  doi:10.3969/j.issn.1009-0479.2021.03.010

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Baimashan lead-zinc mine of Yingjiang is located in Tengchong-Lianghe polymetallic metallo-genic belt of “Sanjiang”in Yunnan Province, The lead-zinc orebody occurs in the fracture zone of thefirst member of Cuanshang formation of Lower Devonian. The shape of the ore body is vein-like and len-ticular, the expansion and shrinkage, reappearance are common phenomenon. The ore body is strictlycontrolled by the strata and structure, especially closely related to interlayer faults. Based on the site in-spection, the author thinks that the Baimashan lead-zinc deposit is a hydrothermal filling vein deposit.The wall rock alterations related to mineralization are skarnization, sericitization , limonite mineralization.carbonation and silicification. Soil geochemical anomaly can also be used asimopor-tant prospecting indi-cator in this mining area.






Development of Static Strength Test Tooling for Large Railway Maintenance Machinery Frame Based on ANSYS

Xiaodong, TENG Yu, WU Lei, TONG iaotian, LIU Jie, CAI Chuanxiong

2021, 37(3):  59.  doi:10.3969/j.issn.1009-0479.2021.03.011

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A tooling for longitudinal tension and compression test with one clamping was developed,sothat the static strength test of all large railway maintenance machinery frame can be completed with verti-cal weights, car lifting machines, etc. Static strength tests of various frames have been completed. Thetest standards of static strength of large railway maintenance machinery frame was analyzed and dis-cussed. The author thinks that the current standard used in our country is too strict and is not apply tothe domestic large railway maintenance machinery.

Power Distribution Parameter Monitoring System for Cigarette Factory Based on ModBus RTU Protocol

XU Liange

2021, 37(3):  64.  doi:10.3969/j.issn.1009-0479.2021.03.012

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According to the requirements of a cigarette factory , the change of distribution system parameters is monitored in real time, so that the problems in parameters can be timely warned. A power distribu-tion parameter monitoring system based on ModBus RTU protocol is proposed in the paper. The systemrealizes the serial communication between MCU and PLC. The MCU receives the data of power parameters and carries on the analysis and processing, then displays the monitored parameters through the multidigit tube to realize the real-time monitoring of the parameter state. The practical application proves thatthe system can monitor all kinds of distribution parameters with stable operation, good real-time performance , simple software.

Design of Multi-channel Steering Gear Network Controller Based on RS422 Bus

ZHONG Zhixian, DING Yu, WU Shili, GUO Yufeng

2021, 37(3):  71.  doi:10.3969/j.issn.1009-0479.2021.03.013

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This paper presents a hardware design and software implementation of a multi-channel servocontroller based on RS422 bus and user-defined communication protocol. Through the PCA module ofC8051F340 MCU and the extension of 74HC595, the drive control of 13 steering gear is realized. Theupper computer can realize the remote control of a single actuator by sending the steering angle controlcommand to the controller. The system has the advantages of simple structure , low development cost,strong expansibility and good use value.


Research on Website Governance for Higher Education

XU Sheng

2021, 37(3):  78.  doi:10.3969/j.issn.1009-0479.2021.03.014

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As an important part of digital campus, website group plays an important role in the manage-ment and maintenance of school website and information security. This paper expounds the importantpractical significance of website governance. This paper studies the website group in terms of system ar-chitecture and technical characteristics, expounds the whole process of website migration, and providessolutions to the problems in university websites management.

Application Research on Sponge Municipal Road Design Based on LID Theory

ZHOU Cheng

2021, 37(3):  83.  doi:10.3969/j.issn.1009-0479.2021.03.015

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Based on the LID theory , this paper expounds the functions of rainwater infiltration and rainwa-ter storage of sunken green belts, permeable pavements and ecological tree pools, and points out that thedesign of these areas in municipal road should be combined with site conditions to calculate rainwater stor-age and infiltration, and check the total runoff control scale and runoff pollution control. Through the caseanalysis , it provides theoretical basis for the application of sunken green belts in municipal road design.

Prediction Model of Highway Bridge Cost in Mountain Areas Basedon GA-PB Neural Network: A Case Study of T-Beam Bridges

CHEN Can, LUO Jingwen

2021, 37(3):  87.  doi:10.3969/j.issn.1009-0479.2021.03.016

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After analyzing the engineering characteristics of highway bridges in mountainous areas, thispaper used intuitionistic fuzzy analysis to find out four engineering characteristics which have greater in-fluence on the construction cost of highway bridges in mountainous areas, which are in turn adopted asthe inputs to the model to construct a prediction model of highway bridge cost in mountain area based onfuzzy logic and GA-BP neural network. It also designed a program with MATLAB neural network toolbox.and select 36 sets of completed engineering data to train, test, and verify the model. The results showthat the prediction precision of the model meets the requirements. By comparing the results of the CA-BPneural network model and the BP neural network model, it shows that the CA-BP neural network modelhas faster convergence speed, higher accuracy and better stability. It has further verified the feasibilitand validity of the model based on fuzzy logic and GA-BP neural network.

Study on Fe/ZSM-5 Heterogeneous Fenton Degradation of Methyl Orange

NING Mencui, LI Li, YAN Cuirong

2021, 37(3):  93.  doi:10.3969/j.issn.1009-0479.2021.03.017

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 Fe/ZSM-5 catalyst was prepared with ZSM-5 molecular sieve as support and Fe(NO₃)₃·9H₂O as Fe source. The heterogeneous Fenton system composed of Fe/ZSM-5 and H,0, was used to de-grade methyl orange. The effects of H₂O₂ dosage, catalyst dosage, pH value , reaction temperature andtime on the degradation of methyl orange were studied. The results showed that the degradation rate ofmethyl orange could reach 93.8% under the optimal conditions of 1. 6 g catalyst, 0. 3 mol/L H,O,, pH 3, 30℃and 60 min.

Experimental Study on Preparation of Calcium Hydrogen Phosphate from Phosphogypsum

LI Dongli, TAN Yanxia, YAO Bo

2021, 37(3):  97.  doi:10.3969/j.issn.1009-0479.2021.03.018

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In order to recover and utilize calcium source in phosphogypsum, feed grade calcium hydrogenphosphate was prepared by the reaction of phosphoric acid with calcium hydrosulfide prepared from phospho-gypsum. The results show that the route of preparing calcium hydrogen phosphate from phosphogypsum is fea-sible; both wet process phosphoric acid and thermal process phosphoric acid can produce feed grade calciumhydrogen phosphate products in line with national standards; compared with the two, wet process phosphoricacid has advantages in cost, while thermal process phosphoric acid has advantages in quality. The experimen-tal results have a certain guiding significance for the comprehensive utilization of phosphogypsum.

Study on Spatial Heterogeneity and Diversity of Intestinal Microbes Based on Extended Taylor Power Law Mode

SHEN Xuzhu

2021, 37(3):  101.  doi:10.3969/j.issn.1009-0479.2021.03.019

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Nutrients in dietary directly influence human health and they can serve as metabolic substrates forintestinal microbiota, while metabolic products of microbes absorbed by guts will affect human's physiologicalfunction. In this study, we reanalyzed a dataset of 16S rRNA sequencing consisting of 95 individuals that is divided into three groups (no diet group, diet with high fat group and diet with low fat group), using the ex-tended Taylor's Power Law method and Hill Number index with the aim to study whether or not the diet patternwould change gut microbiota spatial distribution patterns and diversity characteristics. Our results demonstratedthat the systematic characteristics of gut microbiota were stable in general and gut microbial communities pres-ent aggregate condition with little inter-species and intra-species heterogenety in different groups. Adjusteddiet pattern can not cause an obvious change in the spatial heterogeneity of gut microbiota. The result of HilNumber (g =0, 1) revealed that humans with high fat diet had higher diversity than humans with low fat diet.though no significant differences among all groups were observed in Hill Number when g took other values (g2, 3, 4). Overall, our results show that the diversity characteristics of gut microbiota link to the dietarpattern to some extent, but the spatial distribution of gut microbiota had little relationship with dietary pattern.

Optimization of Manufacturing/Remanufacturing Closed LoopLogistics Network Based on Floyd Algorithm

DUAN Limei, TANG Kesheng, LI Yirong, WANG Yidan

2021, 37(3):  107.  doi:10.3969/j.issn.1009-0479.2021.03.020

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Manufacturing/remanufacturing closed loop logistics network is an integrated network of for-ward logistics and reverse logistics based on remanufacturing. Optimization of the manufacturing/remanu-facturing logistics network is to select a reasonable channel for the flow of each finished product and recy-cled product to minimize the total operating cost. This paper proposes a manufacturing/remanufacturinglogistics network optimized model based on Floyd algorithm, which results in the single-piece operatingcost of logistics facilities and the single-piece cost of transportation, and calculates the minimum cost ofeach distribution channel. Considering the capacity limitation of the forward logistics facilities, we canchoose the appropriate circulation path to minimize the total cost. Finally, we give an example to illus-trate the model.

Exploration on the Teaching Reform of the Course of Prefabricated Concrete Component Production in Higher Vocational Colleges

LIU Xue’e, HAN Changju, YANG Xiaojie, ZHANG Song, ZHAO Yiqun

2021, 37(3):  115.  doi:10.3969/j.issn.1009-0479.2021.03.021

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This paper analyzes the problems encountered in teaching the course of prefabricated concretecomponent production for prefabricated buildings. Based on the learning and teaching conditions, thestudy used virtual simulation software to carry out diversified teaching. Docking job standards are met andthe course-certificate integration is realized. Teaching resource library and training base are built and implemented. The assessment method is reformed, which focuses on the process of assessment and is supolemented by cloud classroom theory testing via virtual simulation software.