NOUFERROUS METALLURGICAL EQUIPMENT

Abstract:An intelligent plant for copper rod continuous casting and rolling by SCR process is being constructed by integrating new information technologies, such as Internet of Things, big data, AI, edge computing and 5G, etc., deeply into traditional copper processing enterprises, with digital and intellectualized transformation as a breakthrough, to promote equipment automation, intelligent production, management informatization and networked markets. Relying on the application and innovative development in the context of big data, it can be realized that value chain climbs to the high-end from low-end lock-in and enterprises enter a green and high-quality development stage.

Abstract:Neutral grounding operation mode in power system is a very complex issue. It is related to voltage level, single-phase grounding short-circuit current, overvoltage level and protection configuration, and it can directly affect insulation level, reliability and continuity of system power supply, communication interference and many other aspects. Combined with the design case of an overseas project, this paper introduces the selection process of neutral grounding mode and the parameter calculation of related grounding elements.

Abstract:A management and emergency rescue system for tailings dam with centerline embankment based on 3D scanner is put forward in this paper. With 3D scanner as the measuring device, refined management on tailings classification and embankment process, and integrated management on emergency command and rescue can be realized. The system can enhance the safety of tailings dam, reduce cost of tailings classification and embankment, and serve as strong support to tailings dam emergence rescue, risk elimination and reinforcement, etc.

Abstract:The 32m² fuming furnace introduced in this paper is now the largest one in the world. In this paper, the design difficulties faced by fuming furnace upsizing are analyzed, and the final solution is given. The smooth operation and application of 32m² fuming furnace verified the success of the upsizing design. At the same time, it is believed that fuming furnace enlargement will become a trend, where more and more large fuming furnaces will be applied.

Abstract:In this paper, an electrochemical process and its supporting equipment for producing high purity gold are introduce. The whole process can be divided into electrochemical dissolution and electrochemical precipitation. By using special tank structure and ion permselective membrane, crude gold dissolution and precipitation of gold are done in two tanks, and ion permselective membrane can cut off the passing of [AuCl₄]-to enable the enrichment of Au[Ⅲ] in the anode chamber of the electrochemical dissolution tank. Upon completion of dissolution, the pregnant solution in the anode chamber of the electrochemical dissolution tank is transferred to the cathode chamber of the electrochemical precipitation tank for its precipitation on the cathode plate. Going through the process twice, crude gold can be processed into high purity gold that meets national standards. The whole process is an advanced technology with the advantages of less pollution and no electrolyte pressure comparing with electrolysis or chemical method. The whole set of equipment is simple to operate with automatic control, high reliability and safety.

Abstract:Based on the case of frame filter press in the dewatering process of copper concentrate in slag separation system of copper smelter, the working principle and performance characteristics of frame filter press are analyzed, and the issues to which attention should be paid in production are summarized. Production practices indicate that the frame filter press has a good filtering effect on the copper concentrate of slag separation system, and the moisture content of filter cake is stable at about 10%, which can meet the requirements of smelting technology.

Abstract:High purity quartz is an important raw material for the production of quartz glass and integrated circuit board, which is of great value and irreplaceable in the high-tech industry. With the continuous decrease of natural crystal resources, the research on high purity synthetic quartz has gaining more and more attention. This paper introduces the characteristics, synthesis technology and research status of high purity quartz in a comprehensive manner, besides, the important applications of high purity synthetic quartz are given in this paper. It is considered that the preparation of high purity quartz by liquid hydrolysis of SiCl4, a by-product of polycrystalline silicon production, is a technology that meets the requirements of sustainable development and has potential production value.

Abstract:The 2m² Shaft furnace shell is made of steel plate by rolling and welding, and it needs to be annealed after welding for stress relief. By formulating a reasonable annealing process and taking effective anti-deformation measures, the shaft furnace shell shows an excellent performance after welding and annealing, with the deformation living up to the requirements, and the product quality complying with the requirements of the drawings and technical agreement.

Abstract:This paper expounds and analyzes the issues in the use of the rotating shaft support mechanism of the rectangular support frame of the electric control cabinet of the electric drive hydraulic trolley. The existing issues are effectively solved through the technical transformation, and the actual use test has been successful, It is worth popularizing and applying in the same type of equipment.

Abstract:Local spalling of refractory lining at the roof poses a significant hazard for the stability and safety of the 109m² fluidized roaster for Zn smelting. By local protective maintenance, the stability of roof structure is restored, ensuring safe and reliable operation. It solves the technical problem that damaged roof lining was difficult to repair locally in the Zn roaster in a timely manner during service, and provides a method for repairing the roof lining of Zn roaster, which can be widely applied in the industry.

Abstract:With the rapid development of Chinese electrolytic aluminum industry and the continuous progress of automation and automatic control technology, frequency converters have been widely applied in electrolytic units. In a decade of application, many users have reported that during equipment operation, the damage of the frequency converter causes failure of single-phase grounding or the cable between the frequency converter and the motor, resulting in single-phase grounding on the output side of the frequency converter and eventually simultaneous burning of multiple frequency converters, and no reasonable solution has been found. This paper conducts a detailed theoretical analysis on the problems raised, and introduces the working principle of the frequency converter and the special technology of the electrolytic unit related to the fault. Combined with the field situation, the reason for the centralized burning of the frequency converter is found, based on which a solution is provided through voltage monitoring in the design. And the solution is proved by field test and long-term operation, showing good results.

Abstract:American electrical standard is widely used in North America. It is essential for engineering companies or consulting companies who want to undertake engineering projects in North America to understand and be familiar with the standard. This paper briefly introduces the composition of American electrical standard system, arranges and summarizes the commonly used electrical product standards and engineering design standards, analyzes and compares some commonly used standards and national standards, and lists the differences.

Abstract:In this paper, the basic situation of a copper mine is briefed, and the advancing schedule and stoping schedule prepared by Chinese and foreign parties are briefly described respectively. The Chinese version is prepared according to Chinese standards, while the foreign version adopts western standard. The process and format of the preparation are similar. In this paper, the differences of design ideas and methods between the two versions are analyzed. There are also differences in the consistence between the outcome of the advancing & stoping scheduling and the life cycle of the mine. For overseas projects, it is suggested to integrate foreign common design model into the Chinese design.

Abstract:This paper presents the production principles of aluminum electrolytic cells and the meaning of extending cell liner service life. The 400kA graphitized aluminum electrolytic cell of a company is taken as an example to analyze the characteristics of graphitized cathode and corrosion mechanism and put forward reasonable and suitable technical conditions for electrolysis, as well as innovative materials and methods for repairing corrosion pits, which can slow down the flow rate of molten aluminum and increase heat dissipation. When the bottom of the furnace is relatively cold, a protective layer will grow on and repair the bottom of the furnace to protect the cathode and prolong the service life of the cell. The annual benefit can be increased by 199.92 million RMB, and the solid hazardous waste can be reduced by 15960t, achieving good economic and environmental benefits.

Abstract:As one of critical steps in alumina production, seed precipitation adopts the core equipment, seed precipitation tanks inside which flow field distribution is a key factor influencing sedimentation, scaling and stirring power. This paper has used Fluent, Realizable κ-ε model of RANS, Eulerian multi-phase model and multi-reference frame (MRF) method to conduct numerical simulation of flow field inside seed precipitation tanks and study the influence of stirring speed, distance between blade and the bottom as well as blade diameter on solid particle distribution pattern of aluminum hydroxide. The analysis of concentration field and velocity field shows that on the premise of a fixed stirring power, blades with higher speed and larger diameter are beneficial to suspension of particles, while blades with a too small or too large distance to the bottom can affect suspension of particles.

Abstract:With large-scale electrolytic cells developed in recent years, 500kA aluminum electrolytic cells have gradually become prevalent in new electrolytic aluminum projects and their busbar configuration is mainly divided into self-compensation and external compensation. The magnetic field and cost-effectiveness of these two compensation methods are analyzed so as to provide guidance for new projects on selecting busbar configuration method. This paper has simulated the magnetic field of self-compensating and external compensating busbar configuration in 500kA aluminum electrolytic cells, compared calculation results, and analyzed strengths and shortcomings of these two compensation methods. In addition, this paper has further analyzed the cost-effectiveness of these methods and drawn a conclusion based on busbar consumption and plant footprint in actual project construction.

Abstract:The challenges of global mining project management are superimposed on the new crown epidemic, which has brought more difficulties to project management. Based on the MIM+ solution, ENFI built a digital integrated project execution system, which was successfully applied in the Kamoa-Kakura Concentrator Project. Chinas solution is provided to improve the management and control level of global mining projects.