A cut-off grade for gold and gallium in coal

Wang, Wenfeng; Sang, Shuxun; Hao, Weiduo; Wang, Ran; Zhang, Jie-Fang; Duan, Piaopiao; Qin, Yong

doi:10.1016/j.fuel.2015.01.066

Cited by 24 publications

(10 citation statements)

References 21 publications

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“…e content of Pt and Pd in fly ash is 0.10 g/t and 0.05 g/t, respectively. e typical geological characteristics of the ash can be further proved with the discovery of Pt group elements [3]. Besides the Pt group elements, the content of Cu and Ni can reach 0.15%.…”

Section: Discussionmentioning

confidence: 87%

“…e analysis for the specific gravity and the specific surface was carried with the true density tester (G-DenPyc2900, Beijing) and the surface area and porosity analyzer (micromeritics, USA). Table 1, the specific gravity of fly ash is 1.85 g/cm 3 , and the specific surface area is 3180 cm 2 /g respectively. e Ca content in fly ash is 11%, and it is the low calcium content ash.…”

Section: Discussionmentioning

confidence: 99%

“…ese metal elements enriched in y ash can reach 4-10 times of the coal [4]. According to Wang et al [3], the content of Au and Ga in y ash was 1 μg/g and 50 μg/g, respectively, which has a certain comprehensive recovery value. However, the conventional utilization rate of y ash was less than 50% [5], and utilized y ash was still stored in the ash yard of power plants.…”

Section: Introductionmentioning

confidence: 98%

“…Its type is mainly related to coal strata. rough the analysis of the metal elements of di erent ore deposits, it is found that Ca, Ge, Au, Pt, Sc, and other rare metal resources are contained in coal [3]. ese metal elements enriched in y ash can reach 4-10 times of the coal [4].…”

Section: Introductionmentioning

confidence: 99%

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Mineralogy Characteristic Study and Exploration on the Valuable Metals Enrichment of Coal Fly Ash

Chen

Yan

et al. 2019

Advances in Polymer Technology

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The separation and enrichment can be targeted to enrich in fly ash and reduce the cost of leaching and recovering of fly ash. Regarding their different properties, the single-component separation was used to obtain uncompleted burned carbon, glass microbeads, minerals, and other characteristic components from the ash. Also, the mineral composition of each component was analyzed by electron microscopy. The metal minerals were mainly concentrated in the mineral components. Besides, the electron probe microanalysis shows that the Pt content in the minerals of fly ash was significantly correlated with the metal contents of Ni and Cu. After the obtainment of the characteristics of fly ash metal enrichment, the heavy minerals with Cu, Ni, Pt, Pd, and other target metal elements were enriched by gravity separation and flotation. The enrichment coefficients of Cu, Ni, Pt, and Pd were 1.45, 1.33, 1.90, and 1.60, respectively, and the recovery rates were 77%, 81%, 97%, and 88%, respectively. Since the yield of heavy minerals obtained by separation was 62.24%, it indicated the physical separation method could significantly reduce the cost of leaching and recovering of fly ash metal resources.

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Section: Discussionmentioning

confidence: 87%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Mineralogy Characteristic Study and Exploration on the Valuable Metals Enrichment of Coal Fly Ash

Chen

Yan

et al. 2019

Advances in Polymer Technology

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show abstract

“…Its type is mainly related to coal strata. Through the analysis of the metal elements of different ore deposits, it is found that Ca, Ge, Au, Pt, Sc, and other rare metal resources are contained in coal [3]. These metal elements enriched in fly ash can reach 4-10 times the coal content after coal combustion [4].…”

Section: Introductionmentioning

confidence: 99%

Mineralogy Characteristic Study and Exploration on the Valuable Metals Enrichment of Coal Fly Ash

Chen

Yan

et al. 2019

Preprint

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The separation and enrichment can be targeted to enrich the rare and precious metals in fly ash and reduce the cost of leaching and recovering of fly ash. Regarding their different properties, the single-component separation was used to obtain uncompleted burned carbon, glass microbeads, minerals, and other characteristic components from the ash. Also, the mineral composition of each component was analyzed by electron microscopy. The metal minerals were mainly concentrated in the mineral components. Besides, the electron probe micro-analysis shows that the Pt content in the minerals of fly ash was significantly correlated with the metal contents of Ni and Cu. After the obtainment of the characteristics of fly ash metal enrichment, the heavy minerals with Cu, Ni, Pt, Pd, and other target metal elements were enriched by gravity separation and flotation. The enrichment coefficients of Cu, Ni, Pt, and Pd were 1.45, 1.33, 1.90 and 1.60, respectively, and the recovery rates were 77%, 81%, 97% and 88% respectively. Since the yield of heavy minerals obtained by separation was 62.24%, it indicated the physical separation method could significantly reduce the cost of leaching and recovering of fly ash metal resources.

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Potentially useful elements (Al, Fe, Ga, Ge, U) in coal gangue: a case study in Weibei coal mining area, Shaanxi Province, northwestern China

Wang

2018

Environ Sci Pollut Res

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Coal gangue has become one of the largest industrial solid waste in China, but it is also a kind of reserve resources. Representative coal gangue samples from different coal mines (mainly in Permo-Carboniferous and Jurassic) in Weibei area in Shaanxi Province are collected, and potentially useful elements (Al, Fe, Ga, Ge, U) in coal gangue are analyzed. The results show that the reserves of Al and Fe in Chinese coal gangue are 262 million tons and 196 million tons, respectively, based on the geometric mean values of AlO (15.18%, weight percent) and FeO (6.24%, weight percent). Meanwhile, the crude reserves estimation of Ga, Ge, and U are 55,282, 6867, and 32,981 tons, respectively, based on the weighted mean contents of Ga, Ge, and U in coal gangue at 17.55, 2.18, and 10.47 mg/kg, respectively. Furthermore, Ga and Al contents in quite a large number of coal gangue mines exceed the cutoff value, which has a prospect of development and utilization from coal gangue. The policy implications from this study may include that (1) recycling of useful elements in Chinese coal gangue should be treated as an integral part of sustainable development with professional legislations and (2) establishing a basic database of coal gangue and authoritative system with relevant departments for solid waste management may effectively improve comprehensive utilization of coal gangue in the future.

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A cut-off grade for gold and gallium in coal

Cited by 24 publications

References 21 publications

Mineralogy Characteristic Study and Exploration on the Valuable Metals Enrichment of Coal Fly Ash

Mineralogy Characteristic Study and Exploration on the Valuable Metals Enrichment of Coal Fly Ash

Mineralogy Characteristic Study and Exploration on the Valuable Metals Enrichment of Coal Fly Ash

Potentially useful elements (Al, Fe, Ga, Ge, U) in coal gangue: a case study in Weibei coal mining area, Shaanxi Province, northwestern China

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