Highly efficient recovery of molybdenum from spent catalyst by an
Among the hydrometallurgical processes, solvent extraction was considered as an efficient method to recover molybdenum, it is widely used in practical production due to its simple operation, low cost, good selectivity, ... the leaching efficiency of valuable metals can be greatly improved after calcination process. Then the calcined spent ...
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Extraction Separation of Molybdenum by Means of …
The well-known method used in nitric acid technology for processing low-grade molybdenite concentrates [1–10], which ensures the transfer of all molybdenum into solution, …
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Extraction of molybdenite concentrates by leaching
Alternative processes such as oxidative pressure leaching, gained increasing utilization in Mo production. Currently, ammonium molybdate is mainly reached by the ammonia leaching method [1]. This involves roasting molybdenite at high temperatures to obtain molybdenum calcine, which consists mainly of MoO 3 [2-4]. Subsequently, ammonium
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A Novel Technology of Molybdenum Extraction from Spent HDS …
The molybdenum in roasted spent HDS catalysts can be leached by pressure Na2CO3 liquor with a molybdenum leaching of 95.4%. Methyl ctyl ammonium carbonate (N263) can effectively separate molybdenum from the leach liquor, and the extraction and stripping of Mo were 99.8% and 99.5%, respectively. ... alkali leaching is a popular method, …
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Molybdenum Metallurgy
In the sodium hypochlorite leaching method, sodium hypochlorite solution is used to oxidize molybdenite to transfer molybdenum into the solution in the form of sodium molybdate. ... Powder metallurgic method: Molybdenum powder is pressed into strips or briquettes, and the strips are presintered and then sintered at high temperature by using a ...
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Extraction and response surface methodology optimization of …
The sodium roasting–leaching method of pyrometallurgy combined with hydrometallurgy involves leaching by introducing alkali metal Na reagents and reacting ... Figure 5 shows the leaching results using conventional heating methods. Overall, the molybdenum leaching rate was higher than that of tungsten, exceeding 96%, almost achieving complete ...
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Leaching molybdenum from a low-grade roasted molybdenite …
A technique for leaching molybdenum from low-grade roasted molybdenite concentrate was proposed by the aqueous solution containing sodium chlorate and sodium carbonate.
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A fundamental study of leaching kinetics and mechanisms of …
The mechanical activation was applied as a pre-treatment method to improve molybdenite (MoS 2) leaching.The effects of grinding ball size, ball to powder mass ratio, milling speed and time, molar ratio of mineral to oxidants, as well as the influence of solution pH, temperature and leaching time were investigated in detail.
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Treatment method of copper-containing molybdenum concentrate
The invention relates to a processing method of copper-containing molybdenum concentrate, which is characterized in that the copper-containing molybdenum concentrate is ground to obtain mineral powder; uniformly mixing mineral powder and water according to the mass ratio of 1:3-5, carrying out primary oxygen pressure leaching, and carrying out solid-liquid separation to …
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Stepwise separation and recovery of molybdenum, vanadium, …
Various methods including chemical precipitation, ion exchange, and solvent extraction have been developed to separate Ni, Mo, or V from diverse effluents. ... (P204) and tri-n-octylamine (TOA) to separate molybdenum from the acidic leaching solution, and more than 97.5% of Mo was selectively extracted from the solution containing Al and Ni ...
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Molybdenum recovery from acid leaching solution of copper …
In this study, the OFAT method was used to study the process parameters of extraction and stripping of N235 from acid leaching solution of copper smelting dust. And a sustainable method for recovering molybdenum from copper smelting dust was proposed. The composition of the molybdenum extraction complex was determined by the slope method and …
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US9057119B2
A method for leaching molybdenum and/or rhenium from a sulfide ore and/or concentrate containing such, the method comprising the steps of: Exposing the ore and/or concentrate to an aqueous solution of chlorine-based oxidizing species in which the sum of the concentrations of hypochlorite and hypochlorous acid is at least 10 mol % of the chlorine …
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Recovery of vanadium and molybdenum from spent …
The study of the leaching of vanadium (V) and molybdenum (Mo) from spent petrochemical catalysts in sodium hydroxide (NaOH) medium was performed using two approaches, namely, conventional leaching and microwave-assisted leaching methods. The influence of microwave power, leaching time, leaching temperature, and NaOH concentration …
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CN101920997A
The invention relates to a method for purifying molybdenum disulfide by leaching molybdenum concentrate with chlorate, belonging to the field of wet-process metallurgy. The method comprises the steps of: removing metal sulfide impurities in the molybdenum concentrate used as raw material by heating a leaching solution, wherein the leaching solution is a mixed solution of …
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Investigation of Leaching Kinetics of Molybdenum from MoO
In this study, the trial procedure includes oxidation roasting, ammonia/ammonium nitrate optimization for roasted molybdenum concentrate leaching, and the effects of other …
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(PDF) Selective Electro-Oxidation of Molybdenum Leaching
In this paper, a new alternative for the copper elimination from molybdenite concentrates containing chalcopyrite by sulfidation of the molybdenite concentrate and subsequent pressure …
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WO2010090478A2
the method for leaching the impurities of the molybdenum oxide concentrate according to the present invention is carried out using a leaching solution containing ammonium chloride and hydrochloric acid, copper, lead, iron and zinc contained in the molybdenum oxide concentrate ( leaching zinc). At this time, since the dissolution of molybdenum is suppressed, the …
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WO2012065191A2
The acid or alkali leaching methods have many disadvantages because of the involvement of several steps, increased safety requirements and huge loss of chemicals at the end. On the other hand, ... The method that molybdenum and nickel are extracted from acrylonitrile dead catalyst CA3068071C (en) * : : Central America Nickel ...
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Rapid spectrophotometric measurement with a microplate reader …
Meanwhile, P leaching is the main factor causing eutrophication of water if over P fertilizer was applied to soil [1, 2]. The P ... The flow chart of soil Olsen-P determinations using the 48-well and 96-well microplate with the molybdenum blue-ascorbic acid method (MA) and the malachite green (MG) colorimetric method. The area rectangled with ...
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Enhanced molybdenum extraction and purification from acidic …
Solvent extraction with organophosphorus extractants has potential as a low-cost method for efficient Mo recovery for acidic leaching solutions. ... of Mo(VI) with H 3 PO 4 to form soluble H 3 PMo 12 O 40, and simultaneously introduced H 2 SO 4, achieving efficient one-step leaching of complex molybdenum calcine [5]. The focus of this study is ...
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Selective leaching of molybdenum from spent …
In this work, our aim was to study the alkaline leaching of spent HDS catalysts to selectively dissolve Mo using environmentally friendly techniques (namely ultrasound- and …
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Selective Leaching of Molybdenum from Bulk …
This paper proposes selective leaching of molybdenum from Mo/Cu complex bulk concentrates in a 5 M NaCl solution using the electro-oxidation method. Here, the effects of several factors such as pH, pulp …
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Molybdenum recovery from acid leaching solution of copper …
This study developed a process for efficient recovery of molybdenum from an acid-leaching solution of copper smelting dust, which is of great significance to the recovery and …
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Evaluation of molybdenum recovery from sulfur removed spent …
In this article a new spent catalyst sample preparation method was implemented for the purpose of molybdenum leaching in a single step. Further molybdenum and vanadium in …
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Extraction of molybdenite concentrates by leaching
leaching method [1]. This involves roasting molybdenite at high temperatures to obtain molybdenum calcine, which consists mainly of MoO 3 [2-4]. Subsequently, ammonium …
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Preparation of sodium molybdate from molybdenum concentrate …
The process of preparing sodium molybdate by alkali leaching of molybdenum calcine was investigated, the optimal leaching conditions include a solution concentration of 2.5 mol/L, a liquid-to-solid ratio of 2 mL/g, a leaching temperature of 60°C, and leaching solution termination at pH 8. ... Adsorption of phosphate from aqueous using iron ...
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Leaching molybdenum from a low-grade roasted molybdenite
In our present study, we studied the effect of the molar ratio of sodium chlorate to molybdenum (mol/mol) ranging from 0 to 18 on the leaching efficiency of the roasted molybdenum. The effect of sodium chlorate concentration on leaching rate was shown in Fig. 2. When the molar ratio of sodium chlorate to …
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(PDF) Molybdenum Recovery from Spent Catalyst
In this article a new spent catalyst sample preparation method was implemented for the purpose of molybdenum leaching in a single step. Further molybdenum and vanadium in the leach liquor were separated and their concentrations were enriched using ... M. Extraction of molybdenum and vanadium from the spent diesel exhaust catalyst by ammonia ...
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Utilization of molybdenum tailings in subgrade materials: …
Molybdenum tailings (MoT) are solid waste generated during the production process of metallic molybdenum, posing significant potential hazards to the surrounding environment during storage. ... (EA NEN7375) is a commonly used method to determine the leaching amount and mechanism of pollutants in solid block waste (Liu et al., 2022a, Liu et al ...
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A novel method to leach vanadium, molybdenum and nickel from …
Selective leaching of molybdenum from spent hydrodesulphurisation catalysts using ultrasound and microwave methods Hydrometallurgy, 129–130 ( 2012 ), pp. 19 - 25, 10.1016/j.hydromet.2012.08.008
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