scholarly journals Valuable metal recovery from waste tantalum capacitors via cryogenic crushing-alkaline calcination-leaching process

2021 ◽  
Author(s):  
Longgong Xia ◽  
Wei Xue ◽  
Hongjun Wang ◽  
Fengchun Ye ◽  
Zhihong Liu
Keyword(s):  
Metal Recovery ◽  
Valuable Metal ◽  
Leaching Process

Technology and Mechanism of Valuable Metal Recovery from Pyrite Cinder by Chloridizing Roasting

2012 ◽  
Vol 588-589 ◽  
pp. 1671-1676
Author(s):  
Shao Jun Bai ◽  
Shu Ming Wen ◽  
Qi Cheng Feng ◽  
Yu Chen ◽  
Jian Liu
Keyword(s):  
Steel Industry ◽  
New Technology ◽  
Metal Recovery ◽  
Raw Material ◽  
Pyrite Cinder ◽  
Valuable Metal ◽  
Zinc Compounds ◽  
Lead And Zinc ◽  
Chinese Steel Industry ◽  
Iron Bearing

A new technology of pellet production-drying-chloridizing roasting is proposed for valuable metal recovery from pyrite cinder with high content of lead and zinc. The pyrite cinder, containing 60.15% Fe, 2.02% Pb and 2.15% Zn, was pelletized with addition of 2% bentonite in pan pelletizer. Green balls after drying were roasting at 1100 °C for 60 min with 5 wt % of CaCl2 addition in tube furnace. The results demonstrate that pellets with 61.58% of TFe, lead and zinc volatile ratios of 98.02% and 96.83% were obtained. Key technique is that CaCl2 reacts with lead and zinc compounds and the chloride can be volatilized at moderate temperatures. This new technology can recover the valuable metal fully from pyrite cinder and produce qualified concentrate as iron-bearing feed for steel industry, which will help to solve the pollution of pyrite cinder and extend raw material sourcing for Chinese steel industry.

scholarly journals Algorithmic Modelling of Advanced Chlorination Procedures for Multimetal Recovery

Metals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1595
Author(s):  
Lukas Höber ◽  
Roberto Lerche ◽  
Stefan Steinlechner
Keyword(s):  
Metal Recovery ◽  
Small Scale ◽  
Valuable Metal ◽  
Reaction Systems ◽  
Secondary Conditions ◽  
Innovative Process ◽  
Valuable Metals ◽  
Zinc Industry ◽  
Nickel Industry ◽  
Simulation Scheme

In the course of developing an innovative process for CO2-optimised valuable metal recovery from precipitation residues accumulating in the zinc industry or nickel industry, the chlorination reactions were investigated. As the basis of small-scale pyrometallurgical experiments, the selected reaction systems were evaluated by means of thermodynamic calculations. With the help of the thermochemical computation software FactSage (Version 8.0), it is possible to simulate the potential valuable metal recovery from residual materials such as jarosite and goethite. In the course of the described investigations, an algorithmically supported simulation scheme was developed by means of Python 3 programming language. The algorithm determines the optimal process parameters for the chlorination of valuable metals, whereby up to 10,000 scenarios can be processed per iteration. This considers the mutual influences and secondary conditions that are neglected in individual calculations.

Bioleaching of Valuable Metals from Spent Catalyst Using Metabolic Citiric Acid by Aspergillus niger

2020 ◽  
Vol 898 ◽  
pp. 23-28
Author(s):  
Himawan Tri Bayu Murti Petrus ◽  
Hotden Manurung ◽  
Rivky Juarsa Aditya ◽  
Rifani Amanda ◽  
Widi Astuti
Keyword(s):  
Particle Size ◽  
Aspergillus Niger ◽  
Metal Recovery ◽  
Pulp Density ◽  
Spent Catalyst ◽  
Valuable Metal ◽  
Weak Organic Acid ◽  
Valuable Metals ◽  
Calcium Iron ◽  
Leaching Efficiency

Spent catalyst is listed as one of the hazardous wastes. Based on the toxicity characteristic shows that spent catalyst contains some heavy metals at concentration above the regulations limits. This situattion becomes an important issue in nowadays. In this research, fungus Aspergillus niger was investigated to produce weak organic acid (citric acid). Batch experiments were performed to compare the leaching efficiency from spent catalyst of pulp density (2% and 4%) and particle size (212 µm, 150 µm and 75 µm). Result showed that after direct bioleaching process, maximum recovery of valuable metal 24.94%, 7.42%, 1.09%, 3.51%, 4.87% and 1.66% were achieved for aluminum, calcium, iron, copper, silver and platinum respectively at 2% pulp density. Overall data shows that metal recovery at pulp density 2% are higher than 4% pulp density. The maximum recovery based on particle size shows that the smaller particle (75 µm) the higher metal recovery (Al, Ag and Pt) and for some metals was different such as Fe, Cu and Ca.

Sustainable Valuable Metal Recovery from the V–Cr–Fe Ternary Slime via Leaching-Selective Complexation

2019 ◽  
Vol 8 (2) ◽  
pp. 958-965 ◽  
Author(s):  
Yang Zhang ◽  
Xuefeng Peng ◽  
Bingqiang Fan ◽  
Nan Zang ◽  
Shili Zheng ◽  
...  
Keyword(s):  
Metal Recovery ◽  
Valuable Metal ◽  
Selective Complexation

scholarly journals Evaluation of the inhibition process effect “Preg-robbing” for gold recovery (AU)

Veritas ◽  
2020 ◽  
Vol 21 (1) ◽  
pp. 67
Author(s):  
Gregorio Urbano Palma Figueroa ◽  
Javier Alonso Villegas Aragón ◽  
María del Carmen Camiña Pacheco ◽  
Lilia Mary Miranda Ramos ◽  
Antonio Erick Linares Flores Castro ◽  
...  
Keyword(s):  
Acidic Medium ◽  
Complex Structure ◽  
National Society ◽  
Gold Extraction ◽  
Valuable Metal ◽  
Leaching Process ◽  
Extraction Processes ◽  
Extraction Performance ◽  
Inhibition Process ◽  
Gold Mineral

Currently, the National Society of Mining, Petroleum and Energy (SNMPE) states that in recent years the production of gold in Peru has reduced, since in 2016 there was a production of 153 MT, compared to 2005 with a production of 208 MT. Until 2018, a production decrease of 5.4% was established and in 2017 a decrease of 11.3%. Currently there is a need to develop research on gold extraction processes in low recovery minerals with traditionally used processes, due to the complex structure of gold that prevents their extraction. It is necessary to evaluate new processes that are environmentally friendly and that are sustainable in the environmental and economic aspects. In the present work, the applicability of leaching with NaCl and KNO3 in acid medium in a sulphurous gold mineral was evaluated, through the process of leaching with oxidizing salts, which allows to process hydrometallurgy the various forms of gold minerals present in nature. The sample is composed in percentages by Quartz 24%, Carbonates Dolomite 22%, Calcite 6%, Arsenopyrite 19%, Pyrite 5%, Galena 4% and clays associated with traces of Native Au-Electrum, which were interfering with the process of leaching of the sample. A pretreatment by gravimetric concentration was carried out using the Falcón equipment, with the aim of releasing the encapsulated gold and eliminating the interfering agents, facilitating the leaching action of the oxidizing salts. When testing the concentrations of the oxidizing salts, it was found that for the concentrations of 86.86 g/l of NaCl, 21.96 g/l of KNO3 and 125.93 g/l of H2SO4, a maximum recovery of 26.62% gold was obtained. Based on the results from the factorial design, an increase in gold extraction performance was observed; obtaining a maximum recovery of 29.31% of the gold; in the process it was determined that dissolved gold is affected by the presence of clays, producing the "Preg-robbing" effect of the valuable metal and consequently decreasing the recovery of gold after 8 leaching hours. According to the results, it is concluded that the leaching process with oxidizing salts in acidic medium for the type of mineral used, is mainly affected by the presence of coarse gold and electrum associated with clays, establishingconditions of degree of release according to the granulometry in the gold leaching process.

scholarly journals Optimization of Metal Recovery from MSWI Fly Ash by Acid Leaching: Findings from Laboratory- and Industrial-Scale Experiments

Processes ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 352
Author(s):  
Gisela Weibel ◽  
Anna Zappatini ◽  
Mirjam Wolffers ◽  
Stefan Ringmann
Keyword(s):  
Heavy Metals ◽  
Fly Ash ◽  
Acid Leaching ◽  
Waste Incineration ◽  
Metal Recovery ◽  
Industrial Scale ◽  
Mswi Fly Ash ◽  
Gas Cleaning ◽  
Leaching Process

A major part of Swiss fly ashes (FA) from municipal solid waste incineration (MSWI) are treated with the acid fly ash leaching process (FLUWA) in order to recover heavy metals prior to deposition. The FLUWA process uses scrub water from wet flue gas cleaning to leach heavy metals from FA. The leaching efficiency is strongly dependent on the leaching conditions (e.g., pH, Eh, L/S-ratio). This case study presents the optimization of the FLUWA process at the MSWI plant Linth, Switzerland, through determination of ideal process parameters for optimal metal recovery. By means of laboratory- and industrial-scale experiments, the process was adjusted towards a more efficient leaching of Zn, Pb, Cu, and Cd. This included the use of an oxidizing agent (hydrogen peroxide). Laboratory experiments proved to be a powerful tool for simulating process optimizations at industrial scale. An ideal leaching pH of 3.8 was determined and it was observed that the process stability is significantly influenced by the L/S-ratio applied to the leaching process. In the course of the study, the recovery could be improved to 67% Zn, 66% Pb, 30% Cu, and 91% Cd. It can be concluded that for optimal metal recovery the process has to be individually adjusted to the composition of the processed FA and scrub water of each specific FLUWA process.

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