• 유통과학연구
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• 제21권7호
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• pp.41-50
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• 2023

Purpose: The purpose of the research is identified factors influencing the competitiveness of the copper industry in Kazakhstan. Research design, data and methodology: A few studies are dedicated to the analysis in developing countries, particularly Kazakhstan. The algorithm was chosen for research provision: statistical and comparative analysis, correlation, and regression analysis. The data of 1999-2021 obtained from the World Bank, Bureau of National Statistics, National Bank of Kazakhstan. Results: The obtained results demonstrate the trends in the development of the industry since 2000. The development of the copper industry is strongly influenced by the distribution and state of the business environment, economic situation, and trends in the global commodity markets. Conclusions: According to econometric modeling, there is a correlation between the profitability of the copper industry, GDP, copper prices, liquidity, and energy resource prices. Trends in global commodity and energy markets have a significant impact on the state of the industry. Further research should be conducted to include an analysis and forecast of internal factors that may affect the development of the industry, such as copper reserves, condition of fixed assets, government programs, etc. It is also important to examine the correlation with the trends in the development of the global green economy and the revival of the Chinese market.

• Membrane and Water Treatment
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• 제6권2호
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• pp.103-112
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• 2015

In India, recycling of treated effluent plays a major role in the industry. Particularly in copper industry, recycling techniques for treated effluents adopt conventional technologies which are not energy efficient and recovery of high quality process water, free flowing salts and sludge's is very low. This paper presents an overview of enhanced modern technology for treated effluents in copper industry making it more efficient with high recovery of high quality process water and free flowing salts. Life cycle cost (LCC) would be 15-20% lower than the conventional technologies. The conventional technology can be replaced with this proposed technique in the existing and upcoming copper industries.

• 자원리싸이클링
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• 제10권6호
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• pp.15-21
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• 2001

구리를 포함하는 산성 염화동 폐액으로부터 입자형상이 제어된 고순도의 산화동을 중화법을 사용하여 제조하였다 PCB(Printed Circuit Board)제조 산업은 구리 소재를 이용한 전자 부품 가공 산업으로서 제조 공정인 부식 과정에서 다량의 구리가 함유된 에칭 폐액이 발생한다. 환경과 경제적인 측면에서 폐액으로부터 구리성분을 재회수하는 기술의 개발은 매우 중요하다. 본 연구에서는 폐액으로부터 산화동을 회수하는 공정 중 반응 온도를 조절하여 생성물의 입자 크기와 형상을 제어하였다. $40 ^{\circ}C$미만에서 회수한산화동은 입자모양이 침상이었으며 $40^{\circ}C$이상에서 회수한 산화동은 판상을 보여 주었다. 생성물의 물리적 특성을 SEM, XRD, TGA그리고 원자 흡수 분광기를 사용하여 분석하였다.

• 자원리싸이클링
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• 제12권2호
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• pp.3-10
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• 2003

PCB (Printed Circuit Board) 산업에서 배출되는 산성 염화동 폐액으로부터 농약원제로 사용이 가능한 고순도의 copper oxycloride를 제조하였다. PCB제조 산업은 구리 소재를 이용한 전자 부품 가공 산업으로서 제조 공정인 부식 과정에서 다량의 구리가 함유된 에칭 폐액이 발생한다. 환경과 경제적인 측면에서 폐액으로부터 구리성분을 재회수하는 기술의 개발은 매우 중요하다. 본 연구에서는 가성소다로 폐액을 중화하여 copper oxychloride를 회수하는 공정의 반응 조건을 확립하였다. 반응 온도 2$0^{\circ}C$-4$0^{\circ}C$, pH 5-7 사이에서 순수한 copper oxychloride제조가 가능하였고 이때 수득율은 95% 이상이었다. 생성물의 물리적 특성을 SEM, XRD, TGA, ICP 그리고 원자 흡수 분광기를 사용하여 분석하였다.

• 한국환경과학회지
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• 제19권9호
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• pp.1119-1127
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• 2010

The behavior of copper throughout the whole process of wastewater treatment plant that uses the activated sludge process to treat the wastewater of petrochemical industry that contains low concentration of copper was investigated. Total inflow rate of wastewater that flows into the aeration tank was $697\;m^3$/day with 0.369 mg/L of copper concentration, that is, total copper influx was 257.2 g/day. The ranges of copper concentrations of the influent to the aeration tank and effluent from the one were 0.315 ~ 0.398 mg/L and 0.159 ~ 0.192 mg/L, respectively. The average removal rate of copper in the aeration tank was 50.8 %. The bioconcentration factor (BCF) of copper by microbes in the aeration tank was 3,320. The accumulated removal rate of copper throughout the activated sludge process was 71.3%, showing a high removal ratio by physical and chemical reactions in addition to biosorption by microbes. The concentration of copper in the solid dehydrated by filter press ranged from 74.8 mg/kg to 77.2 mg/kg and the concentration of copper by elution test of waste was 2.690 ~ 2.920 mg/L. It was judged that the copper concentration in dehydrated solid by bioconcentration could be managed with the control of that in the influent.

• 한국산업융합학회 논문집
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• 제16권2호
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• pp.35-39
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• 2013

This paper synthesized the new copper removal agent(PW-2001) and investigated removal efficiency of copper, COD, calcium, SS and sludge amounts. Removal efficiency of copper were 96.1% and 99.1% with the lime and PW-2001, respectively while COD removals reached up to 38% and 69.6% with the use of lime and PW-2001. The concentrations of calcium and SS with PW-2001 were decreased 2.68 and 4.95 times lower than those with lime. Amount of sludge with PW-2001 was 60% smaller than lime. Quantity of PW-2001 needed for coagulation only reached 58.7, compared to lime standard quantity(100), and total cost of copper removal with PW-2001 was saved 25% more than lime.

• 수산경영론집
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• 제52권2호
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• pp.33-54
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• 2021

This study is aimed to analyze the economic feasibility of yellowtail culture using the copper alloy net cage in Gyeongsangbuk-do. First of all, in order to evaluate the copper alloy net cage on yellowtail culture, I review the trend on the yellowtail culture industry and research the concept of copper alloy net cage. The copper-alloy net cage is now recognized as an advantages of its system stability, recycling, antibiosis and food safety. The results were summarized as follows: first, there was significant meaning of the profit model of yellowtail culture by the price difference. Second, I analyzed in the economic feasibility of yellowtail culture using the copper alloy net cage, internal rate of return (IRR) was 51.58%, a benefit-cost ratio was shown to be 2.27 and net present value (NPV) was 1,087,337 thousand won, which indicates the economic feasibility of yellowtail culture using the copper alloy net cage is profitable. Finally, in order to improve the economic valuation, it is necessary to focus more on the developing of technology and cost reduction strategy on the copper alloy net cage.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2001년도 가을 학술발표회 논문집
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• pp.99-104
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• 2001

Slag product has the possibility as alternative aggregate and sand under the circumstance of natural resource shortage. Copper slag is the by-product produced in process of copper industry. Recycling the slag in construction industry could give positive effects on the environmental preservation. This study presents that the fundamental properties of high strength concrete which used copper slag as alternative sand. Testing factors are concrete's slump, bleeding, air contents and compressive strength. The results of this study are as follows. (1) Mixing of W/C 30%, substitution rate 25% shows the best slump. As substitution rates are going up, concrete slump is uprising and air contents are downsizing. (2) The bleeding of concrete becomes more serious as substitution rates are going up. (3) The best compressive strength of copper slag concrete is achieved in mixing of W/C 30%, substitution rate 25%.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2000년도 봄 학술발표회 논문집
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• pp.263-268
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• 2000

Recently, the recycling of the by-products was attempted to various fields. One of the major industry, the copper manufacturing industry produced a lot slags. in this study, the copper smelting slag was used to use practically application for the aggregate of concrete. To find the optimum mixing ratio of mortar with the copper smelting slag as substitution for sand, the mixing ratio was increased 1:2 to 1:5 step by step and every mixture was contained 5 steps sand substitutive ratio. The substitutive ratio of sand was increased 25% st대 by step from 0% to 100%. The result of this study was shown as follows. 1. In the every mixture, as the substitutive ratio was increased, the flow was decrease 3.64% from 18cm, and the unit content weigth was increased 5.5% in average. 2. The property of the strength was judged that it was more affected W/C and mixing ratio than the copper smelting slag.

• 한국정보통신설비학회:학술대회논문집
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• 한국정보통신설비학회 2008년도 정보통신설비 학술대회
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• pp.513-515
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• 2008

Due to the rapid development of telecommunication industry, most telecom operators are investing to upgrade their access networks by using optical cables instead of copper cables. Building new telecom ducts for optical cable installation requires so huge capital expenses that most telecom operators need to remove unused copper cables in order to secure enough space to in-stall optical cables. In this paper, we will present a alternative method to extract copper from removed copper cables.