Oxidation Behavior of Copper Concentrate, Gold Concentrate, and Their Mixtures Between 1173 K (900 °C) and 1373 K (1100 °C)

Choi, Kyungsob; Kim, Sookyung; Kim, Min-seuk; Park, Hyun-Sik

doi:10.1007/s11663-019-01575-3

Cited by 10 publications

(3 citation statements)

References 28 publications

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“…As the name suggests, the atom transfer step is key in the ATRP process and it enables the polymer to have uniform chain length and structure. [8][9][10][11][12][13][14][15][16][17][18] In this study, we investigated the electrical properties of PEDOT:PSS especially, electrical conductivity prepared using PSSA having different molecular weight distributions. To conrm this hypothesis, we prepared PSSA having different molecular weight distributions.…”

Section: Introductionmentioning

confidence: 99%

Effect of molecular weight distribution of PSSA on electrical conductivity of PEDOT:PSS

Kim

Park

et al. 2019

RSC Adv.

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Section: Introductionmentioning

confidence: 99%

Effect of molecular weight distribution of PSSA on electrical conductivity of PEDOT:PSS

Kim

Park

et al. 2019

RSC Adv.

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“…The results of determining the reaction model show that the limiting step of all elementary oxidation reactions of the studied ore is nucleation and crystal growth. The examples of the application of the JMAEK model to describe the mechanism of oxidation of sulfides (in particular, chalcopyrite and pyrite concentrates) should be mentioned [41,67,88]. The values of the Avrami exponent (n r j) obtained in this work are in the range from 1 to 1.7, which allows us to draw the following conclusions regarding the details of the mechanism and morphological features of the process: i) crystallization of the products of elementary reactions is accompanied by an increase in the number of nuclei;…”

Section: Resultsmentioning

confidence: 99%

Kinetics of solid-state oxidation of iron, copper and zinc sulfide mixture

2023

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The kinetics of solid-state oxidation by air of iron, copper and zinc sulfide natural mixture, which is typical of the pyritic copper ores, is investigated. Using the high-temperature X-ray powder diffraction, thermogravimetry and differential scanning calorimetry, it was found that the process can be represented by five exothermic elementary reactions, corresponding to intensive burning of iron, copper and zinc sulfides, and two endothermic ones, associated with decomposition of copper and iron sulfates. Kinetic analysis is performed by Kissinger and Augis–Bennett methods, the model-free function mechanism was determined from y(α) master plots and iterative optimization of the kinetic parameters. The limiting steps of these reactions are nucleation and crystal growth, and the values of activation energy, pre-exponential factor and Avrami exponent are in the ranges of 140–459 kJ·mol–1, 1.41·104–3.49·1031 s–1, and 1.0–1.7, respectively. Crystallization is followed by an increase in the number of nuclei, which may be formed both at the interface and in the bulk of the ore particles, and crystal growth is one-dimensional and controlled by a chemical reaction at the phase boundary or diffusion. The results of the work can contribute to the development of theoretical ideas about the physicochemical transformations of pyritic ores and concentrates during pyrometallurgical operations.

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“…       ×         log     log     , below 1 kHz 한국군사과학기술학회지 제23권 제6호(2020년 12월) / 561 한 실험을 통한 전달손실 모델 [4] 및 한국해역에서의 측정을 기반으로 한 주변소음모델 [5,6] 화 모델을 적용하였고 [4] , 어뢰소나의 표적신호 탐지 준위에 감쇄요인이 되는 잡음신호 모델링에서는 주파 수대역에 따른 영향성을 갖는 주변환경 잡음 이론을 한국 해역에 접목시킨 근사화 모델 [5,6] 석, [10] 연구를 통하여 향후 지속 발전시켜나간다면 잠 수함 운용군의 역량 향상에 기여할 수 있는 활용이 기대된다.…”

Section: 주변환경 잡음 모델unclassified

A Study on the Torpedo Sonar Simulation for Combat System by Modeling Target and Noise

Kim¹,

You²,

Kim³

et al. 2020

J. KIMS Technol

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In environment of torpedo firing, underwater acoustic signal is generated by target and noise. Sound wave which is generated from acoustic signal is propagated by seawater and it is received through the sonar(sound navigation and ranging) system mounted on torpedo. In the ocean, acoustic signal or sound wave from target that is generated by the spread of broadband can be attenuated by ambient noise and can be lost by medium and environment. This research is designed to support teamwork training in Naval operations by constructing a simulation system that is more similar to the real-world conditions. This paper attempts to research the modeling of target detection and to develop the simulation of torpedo sonar(TOSO). In order to develop the realistic simulation, we researched the broadband sound modeling of target and noise source, the modeling of acoustic transmission loss by chemical component of seawater, and the modeling of signal attenuation by ambient noise environment which is approximated by experimental measurements in seawater surrounding the Korea Peninsular and by experience of Navy's actual torpedo firing. This research contributed to constructing more practical simulation of torpedo firing in real time and the results of this research were used to develop a teamwork training system for the Navy and their education.

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Oxidation Behavior of Copper Concentrate, Gold Concentrate, and Their Mixtures Between 1173 K (900 °C) and 1373 K (1100 °C)

Cited by 10 publications

References 28 publications

Effect of molecular weight distribution of PSSA on electrical conductivity of PEDOT:PSS

Effect of molecular weight distribution of PSSA on electrical conductivity of PEDOT:PSS

Kinetics of solid-state oxidation of iron, copper and zinc sulfide mixture

A Study on the Torpedo Sonar Simulation for Combat System by Modeling Target and Noise

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