Table of Content

27 October 2020, Volume 36 Issue 5

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Evaluation and Analysis of the Uncertainty of the Compressive Strength Value of Iron Pellets for Blast Furnace

DUAN Jiahua, WU Guangyao, YAN Hai, CAO Zhong

2020, 36(5):  1.  doi:10.3969/j.issn.1009.0479.2020.05.001

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According to CB/T14201--2018 determination of compressive strength of iron pellets for blastfurnace and direct reduction, the paper measures therepeatability , testing machine , standard dynamome-ter and uncertainty of each component of computer acquisition system. The compressive strength of ironpellets is measured by the pellet compression tester, and the measurement results are evaluated accordinto JJF1059.1-- 2012 evaluation and expression of measurement uncertainty. The results show that themeasurement uncertainty is Ugs( P) = 3. 2% , k =2. The results show that through the evaluation and a-nalysis of the measurement uncertainty of each component, the measurement repeatability component hasthe greatest influence on the measurement uncertainty: the detection reproducibility of this method is bet-ter than that of the existing methods: a lot of operation time is saved.

Study on the Application of Large Diameter and Deep Hole SideCaving and Subsequent Filling Method in a Metal Mine

WU Shangrong

2020, 36(5):  4.  doi:10.3969/j.issn.1009-0479.2020.05.002

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The paper uses the large-diameter deep hole side caving and subsequent filling method to testmining methods based on the mining techniques and conditions in a certain area of a metal mine. Accord-ing to the stability and cavern support of the roof cutting and side wall after the mining method test, thestability of the roof and side wall after the mining blasting in the stope is analyzed in order to study thejoint structure in the stope and the ore control fault in the upper and lower walls for subsequent filling ofthe empty stope. The influence of filling method can provide basis for selecting mining method and designing structural parameters of mining method in deep mine.

Study on the Control Scheme of H2 Landslidein the West of Xiushuihe Mine

LIU Bingfeng, GENG Xiangwan

2020, 36(5):  9.  doi:10.3969/j.1009-0479.2020.05.003

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This paper takes Xiushuihe mine as the engineering project, the formed H2 landslide as theresearch object, and evaluates the stability of three conditions ( the natural state, rainstorm and earthquake) by using the transfer coefficient method. Based on the analysis of the formation mechanism of thelandslide , the paper puts forward the prevention and control scheme of clearing and cutting the slope , andtakes the load increasing counter-pressure at the foot of a platform slope of 2 397 m. The total clearingvolume is 115. 23 x 10' m’, and the total back pressure rock volume is 6 881. 16 m’. Through the reason-able construction design guiding the engineering practice, the mine eliminated the hidden danger and achieved good results.


Leak Detection Analysis and Maintenance of Gas Extraction Pipeline Based on Pressure Gradient Method

MAO Jianing, RUAN Jin, LIU in, WANG Shaoliu

2020, 36(5):  15.  doi:10.3969/j.issn.1009-0479.2020.05.004

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By Changling coal mine gas extraction efficiency, extraction system for the estimation, basedon the gas pressure gradient method, the application of numerical simulation method is the principle ofpressure gradient method to detect pipeline leakage , pipeline segment negative pressure monitoring method adopted for mine gas extraction system are analyzed in leak detection , and has carried on the confirmation to pipeline leak at the scene and maintenance. The results show that using pressure gradient methodto detect the leakage of gas extraction pipeline can effectively and accurately solve the leakage problem ofpipeline, effectively improve the gas extraction efficiency of Changling coal mine, and is of great significance to mine safety and efficient production.


Study on the Surrounding Rock Stability of an Underground Iron Mine Based on FLAC^3D 

LIYi

2020, 36(5):  20.  doi:10.3969/j.issn.1009-0479.2020.05.005

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The paper adopts the point-pillar upward layered filling mining method on the basis of thecharacteristics of an iron mine such as inclined orebody, thick ore body , high-bench , rockmass stabilityand protection need to the surface. It also illustrates the mining technology of as designed. To ensure thereliability and rationality of safe use of the mining method, the stope structure parameters are as follows :the stope length is 40 m, the inter pillar 4 m wide, the spot pillar 5 m x5 m, and the net spacing betweenthe point pillars 8. 5 m. Stability of the stope with this structural parameter is simulated by FLAC3D soft-ware. Simulation results show that the stope structural parameters have certain feasibility , rationality andsecurity in the case of filling; the height of plastic zone produced by slicing operation is small, and thesurface subsidence deformation is very small, which indicates that the safety of mining with point-pillaiupward layered filling mining method will not present safety risks to the surface. lt is also proved that themining method has the advantages of high efficiency and low cost. The research results provide a theoreti-cal basis for the safe and efficient production of the mine.

Application of High-Resolution Scanning Electron Microscope and Energy Dispersive Spectrometer for Mineral Analysis of Shale Reservoir

LU Ping , CHENG Yong, ZHANG Jinliang , NIE Qi , WEN Yiming

2020, 36(5):  26.  doi:10.3969/j.issn.1009-0479.2020.05.006

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High resolution Scanning Electron Microscope ( SEM) can directly observe the surface mor-phology and mineral composition of the samples, and Energy Dispersive Spectrometer ( EDS) can conductquantitative or semi-quantitative composition analysis. The combination of SEM and EDS plays an important role in mineral composition identification. In this paper, the mineral composition of paleogene shalereservoir in Liaozhong Sag was studied by argon ion polishing technology , field emission scanning electronmicroscope and energy spectrum analysis. The results show that the Backscattered Electrons ( BE) arenot as good as the secondary electrons in reflecting the surface morphology details of the sample whenstudying the mineral in shale reservoir by sem, but the BE can show the difference of chemical composition or atomic number in the microregion, and the mineral can be preliminarily identified by gray scaledifference and mineral morphology characteristics. Therefore , for minerals with similar morphology and little difference in the gray scale of backscattered electron images, they can be distinguished according to theelement composition and atomic ratio analyzed by energy spectrum. For unusual minerals, the composition and distribution of elements can be inferred from energy spectrum.

Experimental Study on Gravity Seperation and Waste Disposal in Lead-Silver Ore

PENG Fenlan, LIU Jin

2020, 36(5):  34.  doi:10.3969/j.issn.1009-0479.2020.05.007

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For a lead-silver ore , a simple and reasonable gravity separation process was used to study thegravity separation and waste disposal of a lead-silver ore. The lead concentrate containing 53. 71% Pband Ag2 757.80 g/t was obtained when the lead ore contained 41. 76% Pb and 1 915. 77 g/t Ag, therecovery rate of lead is 89. 03% and that of silver is about 91. 98%.

Analysis of Hidden Disaster-Causing Factors in a Coal Mine

LIU Cong, WANG Lianxu, LIU Yuxin, SHEN Yuan

2020, 36(5):  37.  doi:10.3969/j.issn.1009-0479.2020.05.008

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lt is one of the most effective ways for coal mine enterprises to carry out hidden disaster-cau-sing factors analysis,which embodies safety first, prevention first and comprehensive treatment, and isalso an important measure to effectively prevent serious and catastrophic accidents in coal mines. Takinga coal mine as the research object, this paper analyzes the hidden disaster-causing factors such as flood.gas, fire and power. By using the method of transient electromagnetic geophysical exploration and drilling.this paper analyzes the disaster-causing factors of goaf and old kiln, and puts forward corresponding prevention and control measures.

Designing of Electric Control System for a Company's Technological Transformation Project

XING Yupeng, ZHOU Minhui, XIE Ying

2020, 36(5):  42.  doi:10.3969/j.issn.1009-0479.2020.05.009

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This paper combines the characteristics of the curent electrical control systems PLC and DCSin the pharmaceutical, tobacco and other process industries. In a company's electrical control systemtransformation project, it proposes the overall design and configuration of two sets of electrical control system, forming a bottom-up fully integrated automation architecture including sensor , actuator and control.ler and host computer. Through the actual application verification, the design fully meets the technical requirements of the project, which can save costs for the enterprise.

Design of Failure Alarm Device for Control Circuit of Automobile Fog Lamp

LI Yuan

2020, 36(5):  47.  doi:10.3969/j.issn1009-0479.2020.05.010

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Automobile fog lamp is an important external lighting device for automobile. In the case of badweather, the light penetration of fog lamp is strong, which can improve the visibility of the car and thesurrounding traffic, to warn the drivers and help avoid the occurrence of traffic accidents. However, thecircuit of fog lamp indicator and the control circuit of fog lamp are not necessarily in series , which makesthe fog lamp malfunction and the fog lamp indicator still works normally. Based on the analysis of theworking principle of the automobile fog lamp and the existing hidden danger of the automobile fog lampsystem, this paper improves the branch of the automobile fog lamp and adds a relay to it. When thebranch of the automobile fog lamp malfunctions , the indicator light of the fog lamp will not work , and thiscan solve the problem when the automobile fog lamp system fails to work.

Application of Emergency Communication Network Based on Cluster Cooperative Spectrum Sensing

SONG Hao, CHEN Yunchuan, ZHAO Ye, HU Cunlin

2020, 36(5):  51.  doi:10.3969/j.issn.1009-0479.2020.05.011

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In the case of sudden disaster accidents, the emergency communication network plays a veryimportant role in the disaster relief because of its reliable and stable network carrying capacity, which caneffectively solve the prominent problems such as the reduction of frequency spectrum detection rate in thesevere environment. In this paper, a cluster based cooperative spectrum sensing algorithm for emergency communication is proposed. In order to reduce the influence of channel attenuation and improve the accu.racy of spectrum perception, the nodes in the network are divided into several clusters, and the data fu.sion of two-level multi-user collaboration is completed within and among the clusters. Finally , the detec-tion rate, effectiveness and applicable environment of the algorithm are analyzed and compared, and itsfeasibility is tested by Matlab software.

Application and Hidden Dangers of Artificial Intelligence in Computer Network Technology in the Era of Big Data

LIANG Ying, DONG Xu, XIE Wanyu

2020, 36(5):  56.  doi:10.3969/j.issn.1009-0479.2020.05.012

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The ushering of big data has brought huge impact on and changes to mankind's life and workComputer network technology has become even more intelligent especially with the development of artifcial intelligence. The paper expounds related theories of big data and artificial intelligence , analyzes therelationship between big data and artificial intelligence, and proposes the application of artificial intelli-gence in system security technology, intelligent management system, garbage filtering technology and oth-er computer network technologies. lt also discusses about the issues about impact of privacy protectioncaused by big data on artificial intelligence.

Classroom Intelligent Wireless Security Alarm SystemBased on STC MCU and LabVIEW

ZHONG Zhixian, LIU Jun, BAO Aimin, JIANG Wei, MIAO Rui

2020, 36(5):  60.  doi:10.3969/j.issn.1009-0479.2020.05.013

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The paper designed a simple intelligent wireless security alarm system for classroom to solvethe problem in the extensive security management in classroom. The hardware is divided into terminalwireless data acquisition module, host coordinator and PC. The terminal transmits the enyironmental in-formation of the classroom to the host, which is connected to the host computer through RS232 serial bus.The host computer applies LabVIEW to complete the data analysis and processing, and realizes the hu.man-computer interaction monitoring display interface of the classroom security alarm svstem. The svstemhas lots of advantages such as simple structure, convenient installation and maintenance of the wirelesstransmission，good expansibility and applicationvalue.

Environmental Risk Analysis & Assessment and Prevention & Control Measures Undertaken by Zinc and Indium Smelting Enterprises

WANG Jinliang, LI Li, CHEN Gang, AN Kangfa, LI Zhihua

2020, 36(5):  66.  doi:10.3969/j.issn.1009-0479.2020.05.014

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Based on the environmental risk analysis and assessment of a typical zinc and indium smeltingenterprise in Yunnan Province, the paper proposes some environmental risk prevention and control coun-ermeasures and measures in the enterprise environmental risk management and the production process.which are in correspondent with relevant national standards and requirements. To provide reference andreference for similar enterprises to carry out environmental risk analysis, assessment and formulate envi-ronmental risk countermeasures and measures.

Study on Preparation of Food Grade Silica by Fractional Precipitation of Inorganic Acid

ZHANG Jinliang, LU Ping, ZHANG Fengxia, HUANG Hui

2020, 36(5):  73.  doi:10.3969/j.issn.1009-0479.2020.05.015

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In this paper, food grade silica was prepared by fractional precipitation process of prophasesulfuric acid precipitation and late carbonization precipitation. The influences of the end point pH of sulfuric acid precipitation, Na,Si0, concentration, reaction temperature and PEC 6000 addition amount onthe properties of silica were investigated. The results showed that the optimum conditions for the fraction-al precipitation of inorganic acid were: pH value of the end point of sulfuric acid precipitation was 9.5the concentration of Na,Si0, was 40 g/L, the reaction temperature was 80°C , and the additive PEC 6000was 2 g/L. Under this condition, the specific surface area and DBP oil absorption value of the productare 232. 7 m'/g and 2.87 cm’/g respectively, which meet the requirements of national food grade silica.

Analysis on the Application of Conditioners in Aerobic Composting of Sludge

TAN Yanxia, LI Dongli, LI Fenrui, CHEN Wentong

2020, 36(5):  79.  doi:10.3969/j.issn.1009-0479.2020.05.016

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The paper introduces the characteristics of municipal sludge and the principle of aerobic sludgecomposting, and expounds the importance of conditioner in the process of composting. Secondly, the characteristics of all kinds of conditioners are clarified by summarizing the types of conditioners. Finally, theeffect of conditioner on aerobic composting of sludge was discussed. The purpose of this paper is to providetheoretical support and reasonable suggestions for the application of sludge aerobic composting conditioner.

Study on the Adsorption of Acid Red by CTS/Al₂O₃ Microspheres

NING Mencui, LI Li, ZHU Hongwei

2020, 36(5):  83.  doi:10.3969/j.issn.1009-0479.2020.05.017

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CTS/Al₂O₃ microspheres were prepared to study the adsorption performance of CTS/Al₂O₃ microspheres for acid red. The adsorption mechanism of acid red by CTS/Al₂O₃ microspheres wasdiscussed,and the relevant kinetic parameters were obtained, indicating that CTS/Al₂O₃ microsphere ad-sorbent has a good effect on acid red removal and is a promising dye wastewater treatment agent.

Optimization of Experimental Conditions for Simultaneous Generation of Electricity from Simulated Domestic Wastewater by Single Chamber Air Cathode Fuel Cell

XIE Leilei, CHEN Lisheng, LI Ran, WU Wenbin

2020, 36(5):  87.  doi:10.3969/j.issn.1009-0479.2020.05.018

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The microbial fuel cell was made with the activated sludge as a simulated domestic wastewaterfrom the anaerobic tank of one reclaimed water treatment station. The paper applies microbial fuel cell totreat domestic wastewater and generates electricity, which can realize the recovery and utilization of ener-gy while treating wastewater. The results show that when the glucose concentration is controlled at10 mmol · L^-1 and the temperature is at 35 °C , it has the best electrochemical performance. The outputvoltage is 0. 326 V, the holding time is 1 120 min, the maximum output power density is 846. 87, the internal resistance is 240 Ω , and the COD removal rate is 46. 11% .

Application of 3D GIS Surface Analysis to Highway Construction and Engineering

LUO Shaoqian

2020, 36(5):  91.  doi:10.3969/j.issn.1009.0479.2020.05.019

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The current highway design software based on CAD all use average area method to calculatethe amount of earthwork, such as Hint Soft, Hard, Hong Ye Road, Route Master, etc. However, inthe process of road construction and engineering, part gorge or abrupt spur region, there are many errorsin the amount of earthwork and stonework. This aticle uses a three-dimensional ClS surface analysismodel to analyze and calculate the amount of earthwork and stonework for local sections. The resultproves that this method has guiding significance for the checking of the filling and excavating earthworkquantity in the process of highway construction.