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.

Fungal Bioleaching of Spent Hydroprocessing Catalyst: Effect of Decoking and Particle Size

2009 ◽  
Vol 71-73 ◽  
pp. 665-668 ◽  
Author(s):  
M. Islam ◽  
Yen Peng Ting
Keyword(s):  
Heavy Metals ◽  
Particle Size ◽  
Aspergillus Niger ◽  
Chemical Analysis ◽  
Fungal Growth ◽  
Spent Catalyst ◽  
Edx Analysis ◽  
One Step ◽  
Catalyst Effect ◽  
Leaching Efficiency

. This work reports on the bioleaching of spent NiMo catalyst using Aspergillus niger. As-received and decoked catalysts of various sizes (as-received, 180-120 µm, 120-45 µm and <45 µm) were examined. Chemical analysis of the spent catalyst confirmed the presence of heavy metals including Al (38.2%), Ni (3.36%), and Mo (12.9%). SEM-EDX analysis revealed a change in the metal distribution within the spent catalyst following the decoking process. In one-step bioleaching where the fungus was inoculated together with the catalyst, fungal growth was not observed. In 2-step bioleaching where the catalyst was added three days after the start of the fungal incubation, the highest Mo (87.3%) and Al (17.20%) leaching efficiencies were obtained from the catalyst of smallest particle size (i.e. decoked grounded; <45µm) while the highest Ni leaching efficiency (94%) was achieved from the as-received spent catalyst.

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.

scholarly journals Hydrometallurgical process development to recycle valuable metals from spent SCR deNOX catalyst

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Jong Hyuk Jeon ◽  
Ana Belen Cueva Sola ◽  
Jin-Young Lee ◽  
Rajesh Kumar Jyothi
Keyword(s):  
Process Development ◽  
Spent Catalyst ◽  
Water Leaching ◽  
Scr Catalyst ◽  
Silicon Compounds ◽  
Valuable Metals ◽  
Spent Catalysts ◽  
Increasing Demand ◽  
Leaching Efficiency ◽  
And Tungsten

AbstractSpent catalyst, containing vanadium and tungsten oxide in a TiO2 glass fiber matrix, pose a risk of environmental contamination due to the high toxicity of its metal oxides if leached into the soil when disposed in landfills. Due to the increasing demand of metals and the continuous depletion of primary resources there is an growing necessity for recycling and reprocessing of spent catalysts and other secondary metal sources for environmental and economical reasons. Study of spent SCR catalyst soda roasting process with dissolved NaOH compared with the usual NaOH dry roasting and its influence in the subsequent water leaching. After optimization, the ideal parameters are roasting using a 0.4 ratio of NaOH/spent SCR catalyst in solution for 2 h at 973 K and de-ionized water leaching for 30 min, at 298 K with a pulp density of 30%. The research results show an important reduction of the roasting temperature and leaching time during the processing of spent SCR catalyst obtaining a 95.4% W and 80.2% V leaching efficiency liquor. Silicon compounds are one of the main impurities leached alongside the valuable metals and in this work, the silicon compounds leached are reduced significantly with the aim of avoiding the de-silication post-processing of the leach liquor. The main advantage of the proposed process is the increase of the leaching efficiency of vanadium and tungsten with a minimization of silicon impurities in a shorter time regardless of the leaching temperature.

scholarly journals Vanadium removal from spent sulfuric acid plant catalyst using citric acid and Acidithiobacillus thiooxidans

2020 ◽  
Vol 20 (4) ◽  
Author(s):  
Bartosz Mikoda ◽  
Anna Potysz ◽  
Harry Kucha ◽  
Ewa Kmiecik
Keyword(s):  
Particle Size ◽  
Sulfuric Acid ◽  
Citric Acid ◽  
Acid Leaching ◽  
Copper Smelter ◽  
Pulp Density ◽  
Acidithiobacillus Thiooxidans ◽  
Acid Plant ◽  
Spent Catalyst ◽  
Sulfuric Acid Plant

Abstract Spent catalysts being considered hazardous wastes exhibit a high metal content in mobile forms. In addition, growing demand for circular economy policy applications requires proper utilization of these wastes. This study aimed at the assessment of vanadium leaching from spent desulfurization catalyst derived from sulfuric acid plant dump located nearby a copper smelter. Chemical and phase composition of the catalyst has been characterized. The extraction has been performed using chemical (0.1-M and 1-M citric acid) and biological (biotic solution with Acidithiobacillus thiooxidans) methods, using different experimental parameters (pulp density, particle size, leaching time) to observe V leaching behavior and kinetics. The results revealed that both citric acid and bacteria carried out the extraction process well. The optimal parameters for acid leaching were < 0.2-mm particle size and 2% pulp density, which allowed to leach out 95% of V from spent catalyst within 48 h. The bacterially mediated extraction resulted in 93% V leached out within 21 days with 2% pulp density. The experiments showed that V present in the catalyst is susceptible to bioleaching and organic acid leaching with the latter being a quicker process.

Role of Magnesium Salts in Coal De-Ashing by Flotation

2021 ◽  
Vol 58 (1) ◽  
pp. 51-58
Author(s):  
Rawya Gamal ◽  
Nader A.A. Edress ◽  
Khaled A. Abuhasel ◽  
Ayman A. El-Midany ◽  
Salah E. El-Mofty
Keyword(s):  
Particle Size ◽  
Strong Interaction ◽  
Statistical Design ◽  
Ash Content ◽  
The Other ◽  
Pulp Density ◽  
Statistical Design Of Experiments ◽  
Coal Flotation ◽  
Magnesium Salts

Abstract The most frequently investigated salts in coal flotation are chlorides. However, seawater contains additional salts such as sulfates. In coal flotation, magnesium chlorides showed the best results in terms of higher yield and lower ash content compared to the other magnesium salts studied. Therefore, two magnesium salts were tested in this investigation, namely magnesium chloride and magnesium sulfate. The effect of the magnesium salts as well as the optimization of coal flotation were investigated by statistical design of experiments in terms of pulp density, particle size, conditioning time and different dosages of MgCl2 and MgSO4. The flotation results obtained by statistical design show that the ash content was lowest at 8.2% when a mixture of 2 kg/t MgSO4 and 2 kg/t MgCl2 has been used, with pulp density 20%, particle size 400 lm and conditioning time 15 min. The particle size plays an important role in reducing the ash content when the conditioning time has been extended and pulp density has been reduced. The strong interaction between the salts hinders the reduction of the ash content to less than 8.2%.

Leaching Behavior Analysis of Valuable Metals from Lithium-Ion Batteries Cathode Material

2018 ◽  
Vol 775 ◽  
pp. 419-426 ◽  
Author(s):  
Wei Sheng Chen ◽  
Hsing Jung Ho
Keyword(s):  
Cathode Material ◽  
Lithium Ion Batteries ◽  
Acid Leaching ◽  
Lithium Ion ◽  
Activation Energies ◽  
Mass Ratio ◽  
Solid Mass ◽  
Environmental Technology ◽  
Valuable Metal ◽  
Valuable Metals

The paper concerns an approach about using environmental technology and hydrometallurgical process to the recovery of valuable metal from waste cathode material produced during the manufacture of lithium-ion batteries. It is noteworthy that the content of nickel, manganese and cobalt from cathode material are in the extraordinary large proportion. In the acid leaching step, the essential effects of H2SO4 concentration, H2O2 concentration, leaching time, liquid-solid mass ratio and reaction temperature with the leaching percentage were investigated. The cathode material was leached with 2M H2SO4 and 10 vol.% H2O2 at 70 °C and 300 rpm using a liquid-solid mass ratio of 30 ml/g and the leaching efficiency of cobalt was 98.5%, lithium was 99.8%, nickel was 98.6% and manganese was 98.6% under optimum conditions. Kinetic study demonstrates the activation energies for those analyzed metals with Arrhenius equation and manifests the data with hybrid reaction control mechanism. The process was proved from activation energies ranged from 27.79 to 47.25 kJ/mol. Finally, the valuable metals will be leached in sulfuric acid effectively.

Investigations on a Novel Process to Recycle Valuable Metals from Spent Al2O3-Based Catalyst

2013 ◽  
Vol 634-638 ◽  
pp. 3222-3226
Author(s):  
Yan Hai Shao ◽  
Ming Ming Li ◽  
Xiong Tong
Keyword(s):  
Sodium Aluminate ◽  
Leach Liquor ◽  
Spent Catalyst ◽  
Water Leaching ◽  
Calcination Process ◽  
Aluminate Solution ◽  
X Ray ◽  
Sodium Aluminate Solution ◽  
Valuable Metals ◽  
Leaching Residue

Based on X-ray phase analysis and exploratory experiments, a novel process was proposed to recycle multiple valuable metals like Al, V, Mo, Ni and Co from spent Al2O3-based catalyst. The spent catalyst was roasted by adding sodium carbonate with certain mol ratio, after water leaching, Al, V and Mo could be extracted into leach liquor, whereas Ni and Co were enriched in the leaching residue. V and Mo were precipitated in step from leach liquor by adding CaO and BaAl2O4, respectively. After removal of V and Mo, Al(OH)3 was prepared from sodium aluminate solution with carbonation decomposition process, and the purity of Al2O3 is 99.98%. With sodium bicarbonate leaching-purification-precipitation-calcination process, V2O5 could be prepared from V-bearing residue. Ni and Co were leached from water leaching residue with sulfuric acid. Recoveries of Al, V, Mo, Ni and Co from spent catalyst are 87.0%, 88.7%, 92.1%, 97.8% and 98.6%, respectively.

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.

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