Slag design and iron capture mechanism for recovering low-grade Pt, Pd, and Rh from leaching residue of spent auto-exhaust catalysts

Zheng, Huandong; Ding, Yunji; Wen, Quan; Zhao, Shizhen; He, Xuefeng; Zhang, Shengen; Dong, Chaofang

doi:10.1016/j.scitotenv.2021.149830

Cited by 36 publications

(14 citation statements)

References 46 publications

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“…The origin of the remaining matrix elements should be the small amount of Paper JAAS impurities that did not migrate into the slag phase but into the alloy phase during the capture of PGMs. 8,9,35 However, the total content of PGMs was only about 2.18%, which implied that PGMs were vulnerable to interference from matrix elements during testing. Pd appeared in higher amounts in the alloy, while Pt and Rh were less than 0.12%.…”

Section: Chemical Composition Analysis Of Fe-pgms Alloymentioning

confidence: 99%

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Investigation and mathematical correction of the matrix complexity effect on platinum group metals using inductively coupled plasma optical emission spectrometry determination

Liu

Zhao

Tian

et al. 2023

J. Anal. At. Spectrom.

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Section: Chemical Composition Analysis Of Fe-pgms Alloymentioning

confidence: 99%

“…Strikingly, obtaining Fe-PGMs by iron capture is a very attractive technology, featuring low cost and environmental friendliness. 9,10 Therefore, the quantitative analysis of Pd, Pt, and Rh in Fe-PGMs is of great importance, especially for pyrometallurgical enrichment and subsequent extraction and separation processes.…”

Section: Introductionmentioning

confidence: 99%

Investigation and mathematical correction of the matrix complexity effect on platinum group metals using inductively coupled plasma optical emission spectrometry determination

Liu

Zhao

Tian

et al. 2023

J. Anal. At. Spectrom.

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“…The high-alumina iron ore is also employed as the raw material in the ironmaking process [11][12][13][14][15]. Furthermore, the high-alumina slag is used to recover platinum group metals (PGMs) from alumina-based spent catalysts with metals collection methods [16][17][18]. Moreover, a tremendous amount of slag with high Al 2 O 3 is produced during the ferronickel alloy and ferrochromium alloy production process [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Effects of Basicity and Al2O3 Content on Viscosity and Crystallization Behavior of Super-High-Alumina Slag

et al. 2022

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The CaO-SiO2-MgO-Al2O3 slags with high alumina content are widely applied in various pyrometallurgical processes. However, for super-high-alumina slags, especially for those with alumina content of more than 25 wt%, there is a lack of relevant studies about the properties of slag. The melting behavior, viscosity, structural property, and crystallization behavior of high-alumina slag with the fixed MgO content of 11.13 wt% and Al2O3 content from 27.61 wt% to 40 wt% were investigated. The results revealed that the liquidus temperatures and complete solidification temperatures of slag increased with the increasing binary basicity and Al2O3 content. The melting temperature and viscosity of the CaO-SiO2-11.13wt%MgO-Al2O3 slag system increased with the increasing basicity from 0.8 to 1 and Al2O3 content from 27.61 wt% to 40 wt%. The increase in Al2O3 caused the formation of high-crystallinity and high melting point materials in the slag, such as spinel and Åkermanite. A large number of non-uniform phases could quickly crystallize out of the solids present in the slag melt, thereby increasing the slag viscosity and deteriorating the fluidity of the slag.

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“…e high temperatures lead to the reduction of silicon and the formation of iron-silicon alloys. Although iron-silicon alloys are difficult to dissolve, silicon is easily generated, resulting in less efficient recovery of PGMs [17]. In recent years, matte capture has also been commonly used to recover PGMs [18].…”

Section: Introductionmentioning

confidence: 99%

Recovery and Enrichment of Platinum from Spent Al2O3 Carrier Catalysts by Matte Smelting-Acid Leaching Process

Sun

Jiang

Huang

et al. 2022

Advances in Materials Science and Engineering

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Recovery of platinum from spent catalysts can meet the comprehensive recycling of secondary resources. Recovery and enrichment of platinum from the spent Al2O3 carrier catalyst using matte smelting for the pyrite-acid leaching process were studied. In melting process, the effects of pyrite, CaO, quartz sand, and Na2B4O7 dosage on the recovery rate of Pt were investigated. In leaching process, the effect of H2SO4 concentration, temperature, time, and liquid/solid (L/S) ratio on Pt enriching efficiency was also investigated. The slag, iron matte, and leaching residue were analyzed using XRD. The molten platinum content in the slag was measured using an atomic absorption spectrometer. The experimental results showed that 98% recovery of platinum was obtained under the following optimum conditions: 1400°C temperature, 50 min smelting time, 1 : 2 mass ratio of pyrite to spent catalysts, 0.5 : 1 ratio of CaO to spent catalysts, and 2 : 1 ratio of quartz sand to the raw material with optimum conditions, which include 15% dosage of Na2B4O7. Moreover, the acid leaching was more efficient under the following optimum conditions: H2SO4 concentration of 1.8 mol/L, time of 70 min, temperature of 60°C, and L/S ratio of 10 : 1. The enrichment and recovery of Pt were achieved at the disappearance of FeS during the acid-leaching process.

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Slag design and iron capture mechanism for recovering low-grade Pt, Pd, and Rh from leaching residue of spent auto-exhaust catalysts

Cited by 36 publications

References 46 publications

Investigation and mathematical correction of the matrix complexity effect on platinum group metals using inductively coupled plasma optical emission spectrometry determination

Investigation and mathematical correction of the matrix complexity effect on platinum group metals using inductively coupled plasma optical emission spectrometry determination

Effects of Basicity and Al2O3 Content on Viscosity and Crystallization Behavior of Super-High-Alumina Slag

Recovery and Enrichment of Platinum from Spent Al2O3 Carrier Catalysts by Matte Smelting-Acid Leaching Process

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