Pretreatment Process on Refractory Gold Ores with As

Nan, Xinyuan; Cai, Xin; Kong, Jun

doi:10.2355/isijinternational.54.543

Cited by 28 publications

(11 citation statements)

References 8 publications

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“…This leaching was obtained when As was dissolved with water. However, if the gold concentrate is simply roasted at a temperature of 700 • C or higher, almost 100% of As can be removed; that said, arsenic is released as As 2 O 3 and becomes an air pollutant [7,[30][31][32].…”

Section: Discussionmentioning

confidence: 99%

Sulfuric Acid Baking—Water Leaching for Gold Enrichment and Arsenic Removal from Gold Concentrate

et al. 2021

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During the roasting of gold concentrate to improve gold recovery, arsenic is released into the air and valuable elements such as Fe, Cu, Zn, and Pb are converted into oxide minerals. In this research, we evaluated the release of As and the loss of valuable metals during the acid baking and hot water leaching processes used for gold concentrate. The acid bake tests were conducted for gold concentrate using an electric furnace by applying various concentrations of H2SO4 solution under different baking times. The water leaching process was enacted using 70 °C water for the baked samples. Chemical and mineral compositions of the raw and treated samples were analyzed using AAS and XRD, respectively. The results show that soluble metal sulfates, such as rhomboclase and mikasite, were formed in the baked samples, and that the leaching of valuable metals (Fe, Cu, Zn, and Pb) was accelerated during the hot water leaching procedure. During acid baking, arsenic was partially removed by volatilization, and the rest of the arsenic-containing minerals were converted to soluble minerals. The soluble arsenic-containing mineral resulted in a dissolution that was 60 times higher than in the roasted sample. The maximum gold grade of solid residues increased up to 33% through the acid baking–water leaching process. It was confirmed that acid baking with H2SO4 prevented As release into the air, as well as the recovery of valuable metals through hot water leaching, such as Fe, Cu, Zn, and Pb, which were formerly discarded in the tailings.

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Section: Discussionmentioning

confidence: 99%

Sulfuric Acid Baking—Water Leaching for Gold Enrichment and Arsenic Removal from Gold Concentrate

et al. 2021

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“…The gold, which occurs in association with pyrite, is hardly extracted by cyanide leaching. Therefore, several technologies for the recovery of gold include flotation of a sulphide concentrate, and roasting at 500 to 700°С [13][14][15][16]. The roasting liberates the gold, making it more amenable to dissolution in the molten copper, and produces sulphur dioxide and trioxide.…”

Section: Desulphurization Roasting Of the Gold Flotation Concentratementioning

confidence: 99%

Gold recovery from flotation concentrate from gold mine tailings using dissolve smelting

Erdenebold

Sung

Wang

2019

J min metall B Metall

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Gold flotation concentrate may contain relatively high concentrations of valuable metals such as iron, copper, and zinc, and occasionally, even precious metals such as gold. The major components of the concentrate are SiO 2 , Fe 2 O 3 , and Al 2 O 3 , but it also contains reactive sulphide minerals such as pyrite. The sulphides in the flotation concentrate are fully converted into an oxide form during oxidative roasting, therefore, the chemical composition of the roasted concentrate is considered to be a copper slag. High temperature smelting with additives to dissolve Au from the gold concentrate into a molten copper was used in the research. Gold greatly dissolved at 1600°С under a CaO/SiO 2 ratio of 1.25, suggesting the increase in the dissolution of gold into molten copper with decreasing viscosity of the molten slag-like concentrate at high temperatures.

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“…16)을 질산농도에 대하여 함께 도시한 결과 왕수분해보다 fire assay 에서 더 많은 금이 나타났다 (Fig. 18) (Habashi, 1973;Huang and Rowson, 2002;Nan et al, 2014). 방출되는 NO 가스에 산소(O 2 )를 반응시켜 NO 2 를 생성하고, 다시 NO 2 에 물(H 2 O)을 반응시켜 질산 (nitric acid, HNO 3 )을 재생시키는 Nitrox process 를 수행하면 질산소비를 감소시킬 수 있을 것이다 (Fair et al, 1987;Fair and Basa, 1989;Droppert and Shang, 1995).…”

Section: Gold Nanoparticleunclassified

A Study on the Removal of Penalty Elements and the Improvement of Gold Contents from Gold Concentrate Using Microwave-nitric Acid Leaching

Kim¹,

Purev²,

Park³

2019

J. Miner. Soc. Korea

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요약 : 본 연구는 금 정광에 함유된 비소(As) 및 비스무스(Bi)와 같은 페널티 원소(penalty elements)를 제 거하기 위한 목적으로 마이크로웨이브-질산침출을 이용하였다. 또한, 금 정광 시료로부터 금 함량을 증가시키고자 하였다. 침출조건은 페널티 원소의 제거를 향상시키기 위해 질산농도, 침출시간 그리고 고액비를 변화하였다. 실험결과 고체-잔류물에서 시료무게 감소율, 비소와 비스무스의 제거율 그리고 금 함량은 질산농도와 침출시간이 증가할수록 그리고 고액비가 감소할수록 증가하였다. 최대 비소와 비스무스 제거율 및 금 함량이 얻어지는 침출조건은 질산용액의 농도 6 M, 침출시간 5분이었다. 이 때, 고체-잔류물 시료의 무게 감소는 87 %, 비소 제거율은 98.23 %, 비스무스는 거의 제거(100 %)되었 고 금 함량은 81.36 g/t에서 487.32 g/t으로 증가하였다. 고체-잔류물을 XRD로 분석한 결과, 질산농도 가 증가할수록 황철석 피크들은 사라지고 반면에, 원소 황의 피크들이 증가하였다.주요어 : 페널티 원소, 마이크로웨이브-질산침출, 비소, 비스무스, 금 ABSTRACT : This study used microwave-nitric acid leaching with the aim of removing penalty elements such as As and Bi. Moreover, enhanced gold content from the gold concentrate sample. The leaching conditions were changed: leaching time, nitric acid concentrations and solid-liquid ratio; In order to improve the removal of penalty elements. As a result of the experiment; sample weight loss rate, As and Bi removal rate and gold content in the solid-residues have been increased when the nitric acid concentration and leaching time were increased while the solid-liquid ratio was decreased. The leaching conditions for the maximum As and Bi removal and gold content were: leaching with a 6.0 M nitric acid solution doing 5 min. At these, the solid-residue sample weight loss was 87 %. As removal rate was 98.23 % and Bi was completely removed (100 %). Furthermore, gold content increased from 81.36 g/t to 487.32 g/t. The XRD of the solid residue showed that pyrite disappeared as the nitric acid concentration was increased, whereas sulfur peaks was increased, too.

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Pretreatment Process on Refractory Gold Ores with As

Cited by 28 publications

References 8 publications

Sulfuric Acid Baking—Water Leaching for Gold Enrichment and Arsenic Removal from Gold Concentrate

Sulfuric Acid Baking—Water Leaching for Gold Enrichment and Arsenic Removal from Gold Concentrate

Gold recovery from flotation concentrate from gold mine tailings using dissolve smelting

A Study on the Removal of Penalty Elements and the Improvement of Gold Contents from Gold Concentrate Using Microwave-nitric Acid Leaching

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