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462 results on '"Hirajima, Tsuyoshi"'

7. Evaluation of micro powder electrode on sulfide mineral leaching for hydrometallurgical process.

Author

Miki, Hajime, Hirajima, Tsuyoshi, Fukuda, Hiroki, Suyantara, Gde Pandhe Wisnu, Sasaki, Keiko, and Daniyarov, Berdakh

Subjects
*OXIDATION-reduction reaction, *SULFIDE minerals, *MINERALS in water, *MINERAL waters, *WATER purification
Abstract

Electrochemical measurement is essential for hydrometallurgical process for evaluation oxidation and reduction reaction. However, electrochemical measurements for powder sample is not well developed since it is difficult to make powder sample electrode. Authors has developed new electrode system for micro gram order powder sample with relative simple method. This system can obtain high reproducibility and sensitivity compared with conventional electrode. Authors evaluates new powder electrode system for various sulfide mineral to apply various hydrometallurgical process. Powder sample indicated high resolution results which can obtain sharp peak, it can indicates oxidation process can be estimated in detail. This method can be applied not only hydrometallurgical process but also various mineral processing and water treatment system. [ABSTRACT FROM AUTHOR]

Published
2024
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8. Arsenic removal with heat treatment - Magnetic separation from dirty copper conc.

Author

Miki, Hajime, Hirajima, Tsuyoshi, Fukuda, Hiroki, Suyantara, Gde Pandhe Wisnu, Sasaki, Keiko, Ochi, Daishi, and Aoki, Yuji

Subjects
*MAGNETIC separation, *COPPER, *COPPER sulfide, *HEAT treatment, *MAGNETIC properties, *SULFIDE minerals
Abstract

Removal arsenic from dirty (arsenic containing) copper concentrate is one of the most important issues for copper processing. Currently for removal of arsenic copper concentrate roasting is applied, but this method is not good for environment. As alternative method, this research applied low temperature heat treatment (less than 400°C) followed by magnetic separation. Primary copper sulfide minerals such as chalcopyrite and bornite can make magnetic property whereas arsenic containing copper minerals such as enargite and tennantite kept non-magnetic property. Magnetic separation after these heat treatments can separate primary copper minerals as magnetic product and arsenic containing copper minerals as non-magnetic minerals. Magnetic separation has been carried out and results shows that arsenic removal from copper concentrate can be achieved with high separation efficiency. [ABSTRACT FROM AUTHOR]

Published
2024
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9. Utilizing oxidation treatment for arsenic mineral removalin producing a cleaner copper concentrate using flotation.

Author

Suyantara, Gde Pandhe Wisnu, Miki, Hajime, Sasaki, Keiko, Aoki, Yuji, Ochi, Daishi, and Hirajima, Tsuyoshi

Subjects
COPPER, CHALCOPYRITE, FLOTATION, MINERALS, ARSENIC
Abstract

The present investigation suggests an oxidation treatment utilizing hydrogen peroxide to separate chalcopyrite, a copper mineral, and enargite, an arsenic-copper mineral, with flotation. The effectiveness of the oxidation treatment in separating both minerals was evaluated through a series of flotation tests. The results of the pure mineral flotation experiment demonstrate that applying an oxidation treatment utilizing a low concentration of hydrogen peroxide has led to an enhancement in the recoveries of chalcopyrite and enargite when potassium amyl xanthate is present. The recovery of both minerals exhibited a decline as the hydrogen peroxide concentration increased. The experimental results indicate that the flotation process employing a binary combination of chalcopyrite and enargite may effectively achieve the separation of enargite and chalcopyrite through a sequential treatment including oxidation and subsequent application of potassium amyl xanthate. It was found that chalcopyrite was strongly depressed, while enargite remained floatable after the oxidation treatment. The proposed oxidation treatment exhibited a separation efficiency of 64%, in which enargite was recovered at a rate of 87% as froth, while chalcopyrite was recovered at a rate of 77% as tailing. [ABSTRACT FROM AUTHOR]

Published
2024
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