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第二十七届中国控制会议

作者： Berrios rodrigo Nuez Felipe Cipriano Aldo paredes rodrigo Department of Electrical Engineering Pontificia Universidad Catolica de Chile

In this paper we discuss the components and design of each part of an expert system for fault detection and diagnosis in the refrigeration process of a hydraulic power *** a minimum group of measurements,it is possible to extract behavior patterns for the whole *** knowledge base is obtained by simulating the dynamic behavior of the *** expert system was designed for a 580MW power plant called Central Pehuenche,located in *** system shows a 96%of detection effectiveness under different operation conditions.

关键词： Fault detection Diagnosis Expert system Hydraulic power plant Refrigeration process

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Pyrometallurgical Removal of Arsenic from Electrostatic Precipitators Dusts of Copper Smelting

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Journal of Minerals and Materials Characterization and Engineering 2021年第6期9卷 545-565页

作者： Hector Henao Ignacio paredes rodrigo Diaz Javier Ortiz Metallurgy Engineering Department Technical University Federico Santa María Av. Espa&#241 a 1680 Postal Code 2340000 Valparaíso Chile CODELCO Ministro Hales Division 48739 Antofagasta Chile

This work describes the experimental results of pyrometallurgical removing of arsenic from the dust collected in the electrostatic copper precipitators within the gas cleaning system of a Copper Flash Smelting Furnace. The generation of dust in the copper smelting worldwide ranges from 2 - 15 wt% per ton of a copper concentrate. In Chile, copper smelters produce approximately 110 kt/y of dust with a concentration of arsenic between 1 and 15 wt%. The dust is a complex of metals oxides and sulfurs with copper concentrations greater than 10 wt% and relatively high silver concentrations. Since its high arsenic concentration, it is difficult to recover valuable metals through hydrometallurgical processes or by direct recirculation of the dust in a smelting furnace. Thus, the development of pyrometallurgical processes aimed at reducing the concentration of arsenic in the dust (<0.5 wt%) is the main objective of this study, giving particular attention to the production of a suitable material to be recirculated in operations of copper smelting. The work provides a detailed characterization of the dust including the Quantitative Evaluation of Minerals by Scanning Electron Microscopy (QEMSCAN), Scanning Electron Microscope-Energy Dispersive X-ray Analysis (SEM/EDS), X-Ray Diffraction (XRD), the elemental chemical analysis using Atomic Adsorption (AAS), and X-Ray Fluorescence (X-RF). By considering that arsenic volatilization requires a process of sulfidation-decomposition-oxidation, this work seeks to explore the roasting of mixtures of copper concentrate/dust, sulfur/dust, and pyrrhotite/dust. By the elemental chemical analysis of the mixture after and before the roasting process, the degree of arsenic volatilization was determined. The results indicated the effects of parameters such as roasting temperature, gas flow, gas composition, and the ratio of mixtures (concentrate/dust, sulfur/dust, or pyrrhotite/dust) on the volatilization of arsenic. According to the findings, th

关键词： Copper Smelter Dust Electrostatic Precipitators of Copper Removal of Arsenic Sulfidation Roasting Process

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Characterization and Pyrometallurgical Removal of Arsenic from Copper Concentrate Roasting Dust

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Journal of Minerals and Materials Characterization and Engineering 2021年第6期9卷 609-620页

作者： Hector Henao Ignacio paredes rodrigo Diaz Javier Ortiz Metallurgy Engineering Department Technical University Federico Santa María Valparaíso Chile CODELCO Ministro Hales Division Antofagasta Chile

This paper describes the experimental results of removing arsenic from the dust collected in electrostatic precipitators of a fluidized bed roasting furnace (RP dust). The fluidized bed roasting process generates 600 kilotons of copper concentrate per year with 3 - 6 wt% of concentration of arsenic, producing a roasted product with a low content of arsenic below 0.3 wt%. The process generates 27 kilotons of RP dust per year with a concentration of arsenic of the order of 5 wt% and copper concentration of around 20 wt%. Subsequently, the dust collected in the electrostatic precipitators is treated by hydrometallurgical methods allowing the recovery of copper, and the disposition of arsenic as scorodite. This work proposes to use a pyrometallurgy process to the volatilization of arsenic from RP dust. The obtained material can be recirculated in copper smelting furnaces allowing the recovery of valuable metals. The set of experiments carried out in the roasting of the mixture of copper concentrate/RP dust and sulfur/RP dust used different ratios of mixtures, temperatures and roasting times. By different techniques, the characterization of the RP dust determined its size distribution, morphology, and chemical and mineralogical composition. RP dust is a composite material of small particles (<5 μm) in 50 μm agglomerates, mostly amorphous, with a complex chemical composition of sulfoxides. The results of the roasting experiments indicated that for a 75/25 weight ratio of the mixture of the copper concentrate/PR dust under 700℃, 15 minutes of roasting time with injection of air, the volatilization of arsenic reached 96% by weight. The arsenic concentration after the roasting process is less than 0.3% by weight. For a 5/95 mixture of sulfur/RP dust, at 650℃, the volatilization of arsenic reached a promissory result of 67%. Even that this study was carried out for a particular operation, the results have the potential to be extended to dust produced in the roasting of concen

关键词： Copper Smelter Dust Electrostatic Precipitators of Copper Removal of Arsenic Sulfidation Roasting Process Fluidized Bed Roasting

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