Recently several techniques for leaching Mo and V from spent HDS catalysts have been developed which are mainly divided into acid or alkali leaching [10] As an efficient and environment friendly method acid leaching attracted the considerable attention of numerous researchers [11] How to selectively stepwise separate and recover Mo and V
An improved analytical procedure has been described for the spectrophotometric determination of colloidal silica in leaching solution by means of adding fluoride to convert colloidal silica into reactive silica The method is a variation of the classical molybdenum blue method and the optimal wavelength temperature ratio of H3BO3/NH4F pH
molybdenum in a copper molybdenum plant as well as among the general population living in an area with high molybdenum and copper contents in soil and vegetables [13 14] For comprehensive utilization of resource and avoiding the negative effect of molybdenum on human health the oxygen pressure water leaching residue of Ni Mo ore can be
The chemical leaching is typically categorized into two main methods acid leaching and alkali leaching The alkali leaching technique has gained widespread acceptance due to its selective extraction ability for molybdenum effectively separating it from other impurities found in spent catalyst waste such as Ni Fe and Co
The effect of leaching parameters including solid liquid ratio leaching duration and temperature on the leaching efficiency of cobalt and molybdenum was investigated By varying these parameters it was possible to assess their individual and combined effects on the leaching process and to identify optimal conditions for achieving high
A new spent catalyst sample preparation method was implemented for the purpose of molybdenum leaching in a single step and the solvent extraction followed by the stripping technique was found to be excellent as the concentration of vanadium and molyBdenum enriched In this article a new spent catalyst sample preparation method was implemented for the
The molybdenum blue method is a spectrophotometric assay which is a simple and cost effective technique used to determine silicic acid levels [44]
molybdenum extraction and reduce acid consumption The optimum conditions obtained were 300 g/L nitric acid 100 g/L sulfuric acid 90°C temperature and 2 hours leaching time in the single stage leaching which extracted % molybdenum The two stage leaching under optimized conditions allows the extraction of % molybdenum in solutions
To improve leaching efficiency and enable the efficient utilization of various metals such as vanadium and molybdenum from spent HDS catalysts different oxidants including O 2 oxygen microbubble Fe 2 O 3 assisted oxygen microbubble and H 2 O 2 were examined More detailed experimental conditions are listed in Table S1
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
molybdenum blue Murphy and Riley 1962 The molybde num blue method is generally used to measure phosphate from particle leaching when the final matrix does not inter fere with colored complex formation The solution that results from 1 mol L21 HCl or H 2SO 4 leaching and total resi due dissolution are acidic In such solutions P can be ana
Spent hydrodesulphurisation HDS catalysts from petroleum refineries mostly constituted by aluminium Al molybdenum Mo nickel Ni and cobalt Co are classified as hazardous wastes and disposal is restricted by environmental regulations; thus the recovery of valuable metals is the most attractive option in the processing of these residues Selective Mo
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
To systematically discuss how to realize the high efficiency utilization of the complex non ferrous metals resources with the high pressure oxygen leaching method the present article reviews the current research progress of the technology performed in the separation and extraction of valuable metals from low grade polymetallic complex ores
Molybdenite is the most important molybdenum concentrate which is mainly recovered as a by product from porphyry copper deposits Due to the low efficiency of purification processes such as flotation in the reduction of copper content of molybdenum concentrate to a standard level less than wt % further purification by a hydrometallurgical method is
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
oxidation method [43] bioleaching [40] pressure oxidative leaching [11] alkali leaching and acidic leaching ferric sulfate ferric chloride leaching sulfuric acid leach ing H 2 SO 4 hydrochloric acid HCl nitric acid leaching HNO 3 and cyanide leaching processes have been used for copper removal from molybdenum concentrates
High chromium vanadium residue HCVR HCVR high chromium vanadium residue is an important secondary resource of valuable metals such as vanadium V chromium Cr and molybdenum Mo The mainstream technology for the utilization of HCVR the Na2CO3 assisted roasting water leaching method usually requires roasting temperatures of more than
Molybdenum is a transition metal of strategic and industrial importance due to its numerous uses The main applications are an alloying agent in steels cast iron reactor vessels special
Molybdenum sulfide and oxidized copper molybdenum and uranium ores as well as secondary raw materials are the sources for molybdenum production In 1940 1970 the pyro metallurgical methods Zelikman 1970 were used for molybdenum breakdown from sulfide ores and concentrates These methods are environmental dangerous and do not allow to isolate
The innovative method of oxalic acid precipitation was used to recover nickel from the raffinate achieving selective extraction of nickel from the solution containing a high concentration of aluminum Pinto ISS Soares HMVM 2012 Selective leaching of molybdenum from spent hydrodesulphurisation catalysts using ultrasound and microwave
The optimal leaching conditions were achieved to obtain the maximum recovery of Mo Ni and V metals and the effect of the mixture of multi ammonium salts on the metal extraction showed an adverse effect for Ni and V while marginal improvement was observed for Mo leaching Expand
Abstract 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 in fluence of microwave power leaching time leaching temperature and NaOH concentration on
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