• Title, Summary, Keyword: copper leaching

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Effect of Copper Retention on Copper Leaching in Wood Treated with Copper-based Preservatives

  • Ra, Jong-Bum;Kang, Sung-Mo;Kang, Shin-Kwon
    • Journal of the Korean Wood Science and Technology
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    • v.37 no.5
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    • pp.421-425
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    • 2009
  • This research investigates the effect of copper retention on copper leaching in wood treated with copper-based preservatives. Radiata pine (Pinus radiata D. Don) sapwood samples were ground in a Wiley mill equipped with a 20-mesh screen. The ground wood was vacuum-treated with various concentrations of alkaline copper quat (ACQ), bis-(N-cyclohexyl-diazeniumdioxy)-copper (CB-HDO), and copper azole (CUAZ). The treated samples were conditioned at $70^{\circ}C$ and 100% RH for 72 hours. The samples were leached by using the distilled water for four weeks, and the copper contents in each sample were measured by X-ray spectroscopy. As expected, the copper leaching was increased with increasing of copper retention. The copper leaching from the ACQ and CB-HDO treated samples were gradually decreased with increasing copper retention: however, the copper losses from the CUAZ treated samples appeared to be proportionally increased with the increase in copper retention in all retention levels tested. The results indicate that at the conditions of the same copper retention ACQ and CB-HDO treated wood have a better leaching resistance compared to CUAZ treated wood.

A Study on Bacterial Leaching of Low-Grade Copper Mineral(V) (저품위 동광석의 세균침출에 관한 연구 5)

  • 민봉희;박원구;이강순
    • Korean Journal of Microbiology
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    • v.12 no.1
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    • pp.25-30
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    • 1974
  • It was convinced that with a relatively small capital investment and with a low operating cost, appreciable amounts of cement copper could be produced from low-grade minerals by the application of a bacterial leaching method. For the recovery of cement copper from the impure pregnant solution, direct precipitation of copper with tin plates by a bacterial leaching method was feasible. The results obtained were as follows: 1)In order to remove the cement copper from the reducing metal, aeration and agitation method were more effective and economic than shaking method. 2)The rate of copper recovery from the pregnant solution was accerelated according to increasing quantities of reducing metal. However, the excess of reducing metal reduced the grade of cement copper. 3)Among the comparative experiments of copper recovery at each reaction temperature of $10^{\circ}C$, $20^{\circ}C$, and $30^{\circ}C$, the recovery rate of copper at $30^{\circ}C$from the pregnant solution was highest. 4)Direct cementation method on iron-containing metal was an excellent method for the recovery of cement copper in bacterial leaching.

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A Study on Bacterial Leaching of Low-Grade Copper Mineral(IV) (저품위 동광석의 세균침출에 관한 연구 4)

  • 박원구;이강순
    • Korean Journal of Microbiology
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    • v.11 no.4
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    • pp.189-195
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    • 1973
  • With the gradual expansion of copper demands, the utilization of enormous tonnages of waste copper mineral containig up to 0.5% copper becomes available. In order to investigate the possibilities on the application of bacterial leaching method to waste dumps or abandoned mines, the authors had carried out microbial leaching of copper minerals by F.ferrooxidans isolated from the Dalsung copper mine water. The results obtained were as follows : 1. The copper extraction rate from the Dalsung chalcopyrite has been a little accerelated by using flasks in place of percolators. 2. The percentage of copper extracted from the Dalsung chalcopyrite sample was 100% in 30 days in the presence of iron-oxidizing bacteria F.ferrooxidans while 9.27% in the absence of bacteria. 3. F.ferroxidans was capable of producing sufficient quantities of ferric sulfate and sulfuric acid from ferrous iron to bring about the dissolution of 100% of copper from the Dalsung chalcopyrite.

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A Study on the Selective Leaching of the Copper Component by Sulfation Process (황산화 배소법에 의한 구리성분의 선택적 침출연구)

  • Kim, Woo Jin;Kim, Joon Soo;Kim, Myong Jun;Tran, Tam;Lee, Jin-Young;Shin, Shun-Myung
    • Journal of the Korean Institute of Resources Recycling
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    • v.25 no.5
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    • pp.57-63
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    • 2016
  • This study were carried out sulfation roasting and selective leaching test for the effective recovery of copper component in concentrate obtained by froth floatation of Autrallian low grade copper ore. The optimum conditions of sulfation roasting were temp. $450^{\circ}C$, $Na_2SO_4$ 2 mole ratio and time 1.5 h, and then selective leaching were room temperature and $H_2O$ or 1M $H_2SO_4$ solutions. Leaching efficiency of optimum sulfation product were 90 wt.% of copper, 20 wt.% of iron and 15wt.% of nickel elements. In this results, it was possible to selective decomposition leaching of the copper component under optimum conditions in this research.

Development of Ammoniacal Leaching Processes; A Review (암모니아 침출공정(浸出工程) 기술개발(技術開發) 동향(動向))

  • Yoo, Kyoungkeun;Kim, Hyunjung
    • Journal of the Korean Institute of Resources Recycling
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    • v.21 no.5
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    • pp.3-17
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    • 2012
  • Selective leaching processes for copper, gold, nickel, and cobalt have been investigated because there is an advantage of ammoniacal hydrometallurgy that metal such as copper could be selectively extracted restricting the dissolution of iron or calcium. In the present article, the studies for selective ammoniacal leaching of copper from motor scraps and waste printed circuit boards (PCBs), for ammoniacal leaching of gold to decrease the amount of cyanide used or to substitute cyanide by thiosulfate, and for ammoniacal leaching to recover nickel and cobalt from nickel oxide ore and intermidiate obtained from manganese nodule treatment process were summarized and further studies were proposed for domestic technology development for ammoniacal hydrometallurgy processes.

Recovery of Copper Powder from MoO3 Leaching Solution (MoO3 침출공정 폐액으로부터 동분말의 회수기술)

  • Hong, Hyun-Seon;Jung, Hang-Chul;Kim, Geun-Hong;Kong, Man-Sik
    • Journal of Korean Powder Metallurgy Institute
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    • v.16 no.5
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    • pp.351-357
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    • 2009
  • A two-step recovery method was developed to produce copper powders from copper chloride waste solution as byproducts of MoO$_3$ leaching process. The first step consisted of replacing noble copper ions with external Fe$^{3+}$ ions which were formed by dissolving iron scraps in the copper chloride waste solution. The replaced copper ions were subsequently precipitated as copper powders. The second step was cementation of entire solution mixture to separate (pure) copper powders from aqueous solution of iron chloride. Cementation process variables of temperature, time, and added amount of iron scraps were optimized by using design of experiment method and individual effects on yield and efficiency of copper powder recovery were investigated. Copper powders thus obtained from cementation process were further characterized using various analytical tools such as XRD, SEM-EDS and laser diffraction and scattering methods.Cementation process necessitated further purification of recovered copper powders and centrifugal separation method was employed, which successfully yielded copper powders of more than 99% purity and average 1$\sim$2$\mu$m in size.

Direct Acid Leaching of Zinc from Marmatite Ores 3 Acid Leaching of Marmatite Ores and the Electrode Potential Behavior of Sulfides (Marmatite 鑛의 直接酸浸出에 關한 硏究 (第3報) Marmatite 鑛의 酸浸出과 黃化物의 電極電位에 關한 硏究)

  • Kim Jae Won
    • Journal of the Korean Chemical Society
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    • v.11 no.1
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    • pp.38-43
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    • 1967
  • In order to explain the positive catalytic action of copper compound for the rate of leaching of zinc sulfide minerals, the electrode and redox potentials of both synthetic and natural sulfides were measured at various conditions of temperatures and pressures. The potentials of Chalcopyrite and copper sulfide were considerably higher than that of zinc sulfide, whereas lead sulfide and Galena had slightly lower potentials than that of zinc sulfide. At elevated temperatures and pressures, the same tendency was obtained. By means of comparing the calculated and measured values of potentials for sulfides, it was suggested that the electrode potentials in acid solution were generated by oxidation of sulfur ion. As a result, it was concluded that the catalytic action of copper compound in the leaching of synthetic zinc sulfide should be arised from the galvanic action between sulfides keeping intimate contact one another in which copper sulfide worked as cathodic and zinc sulfide as anodic part analogous to the metal corrosion under galvanic action.

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Ultrasonic-assisted leaching kinetics in aqueous FeCl3-HCl solution for the recovery of copper by hydrometallurgy from poorly soluble chalcopyrite

  • Yoon, Ho-Sung;Kim, Chul-Joo;Chung, Kyung Woo;Lee, Jin-Young;Shin, Shun Myung;Kim, Sung-Rae;Jang, Min-Ho;Kim, Jin-Ho;Lee, Se-Il;Yoo, Seung-Joon
    • The Korean Journal of Chemical Engineering
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    • v.34 no.6
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    • pp.1748-1755
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    • 2017
  • We studied the ultrasonic effect on the leaching of copper from poorly soluble chalcopyrite ($CuFeS_2$) mineral in aqueous $FeCl_3$ solution. The leaching experiment employed two methods, basic leaching and ultrasonic-assisted leaching, and was conducted under the optimized experimental conditions: a slurry density of 20 g/L in 0.1 M $FeCl_3$ reactant in a solution of 0.1 M HCl, with an agitation speed of 500 rpm and in the temperature range of 50 to $99^{\circ}C$. The maximum yield obtained from the optimized basic leaching was 77%, and ultrasonic-assisted leaching increased the maximum copper recovery to 87% under the same conditions of basic leaching. In terms of the leaching mechanism, the overall reaction rate of basic leaching is determined by the diffusion of both the product and ash layers based on a shrinking core model with a constant spherical particle; however, in the case of ultrasonic-assisted leaching, the leaching rate is determined by diffusion of the ash layer only by the removal of sulfur adsorbed on the surface of chalcopyrite mineral.

Recovery of Copper Powder form MoO3 Leaching Solution Using Cementation Reaction System (MoO3 침출공정 폐액으로부터 치환반응 시스템을 이용한 구리 분말 회수에 대한 연구)

  • Kim, Geon-Hong;Hong, Hyun-Seon;Jung, Hang-Chul
    • Journal of Korean Powder Metallurgy Institute
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    • v.19 no.6
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    • pp.405-411
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    • 2012
  • Recovery of copper powder from copper chloride solution used in $MoO_3$ leaching process was carried out using a cementation method. Cementation is a simple and economical process, necessitating less energy compared with other recovery methods. Cementation utilizes significant difference in standard reduction potential between copper and iron under standard condition. In the present research, Cementation process variables of temperature, time, and added amount of iron scraps were optimized by using design of experiment method and individual effects on yield and efficiency of copper powder recovery were investigated using bench-scale cementation reaction system. Copper powders thus obtained from cementation process were further characterized using various analytical tools such as XRF, SEM-EDS and laser diffraction and scattering methods. Cementation process necessitated further purification of recovered copper powders and centrifugal separation method was employed, which successfully yielded copper powders of more than 99.65% purity and average $1{\mu}m$ in size.

Chemical Leaching of Co, Cu, Ni, Al, Fe by Organic acid from Cobalt Concentrate (코발트 정광(精鑛)으로부터 유기산(有機酸)을 이용(利用)한 Co, Cu, Ni, Al, Fe의 화학적(化學的) 침출(浸出))

  • Ahn, Jae-Woo;Ahn, Hyo-Jin;Kim, Meong-Woon
    • Journal of the Korean Institute of Resources Recycling
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    • v.20 no.6
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    • pp.63-70
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    • 2011
  • Enviromental friendly leaching process for the recovery of cobalt and copper from the cobalt concentrate was investigated by organic acids as a leaching reagent. The experimental parameters, such as organic acid type, concentrations of leachant, time and temperature of the reaction as well as the solid to liquid ratio were tested to obtain the optinum conditions for the leaching of cobalt and copper. The results showed that citric acid was the most effective leaching reagent among the organic acids used in this experiment. About 99% of cobalt, 95% of copper and 70% of nickel was dissolved by 2.0 M of citric acid. Addition of 3.0 vol.% of hydrogen perioxide was effective to enhance the leaching efficiency and the optinum temperature was found to be about $70^{\circ}C$.