Removal Of Molybdenum Research Articles

Removal of molybdenum by TBP-TRPO extraction in sodium isopolytungstate solution

A new process was proposed for extracting molybdenum from tungsten solutions in acidic tungsten-molybdenum mixed solution. The extraction ratio of molybdenum reached 70 % and the tungsten-molybdenum separation factors reached 400 with the hydrogen peroxide dosage of nH2O2/n(Mo) = 2 (nH2O2/n(W + Mo) = 0.3) for the molybdenum-containing isopolytungstate sodium solution. The experimental conditions resulted in the yield of only 20 % of the traditional method (nH2O2/n(W + Mo) = 1.5–2). The organic phases consisted of 2 % TRPO and 60 % TBP. The saturated extraction capacity of molybdenum was found to be 10 g/L. The solution of 0.3 mol/L sodium bicarbonate was used as the stripping agent. With the temperature of 25 ℃, stripping time of 6 min, and the phase ratio of (O/A)2, the stripping ratio of molybdenum was 90 % and that of tungsten was 70 %. The extraction mechanism of TBP-TRPO and the hydrogen peroxide coordination were analyzed using Raman and infrared analyses. The process has a high industrial potential due to its low hydrogen peroxide dosage, high molybdenum extraction ratio, high separation factor, and low cost.

Effective and sustainable bioremediation of molybdenum pollutants from wastewaters by potential microalgae

Due to industrialization and growing population have greatly affected the quality of natural water resources globally. Molybdenum is a harmful metal that can cause serious health issues when exposed to >10 ppm levels. Several industries routinely discharged it, hence posing the environmental problems. For discharged industrial effluents, there are not any environmentally friendly and sustainable treatment method have developed for removing molybdenum hazards. The objective of this study was to design a green, sustainable approach for removing the molybdenum pollutant and to offset the treatment cost by obtaining values from microalgal by-products. Chlorella sorokiniana TU5 and Picochlorum oklahomensis, two fast-growing microalgal strains, were used for molybdenum treatment. The maximum removal efficiency was 115.65 mg L−1 with biomass and lipid yield of 2.35 g L−1 and 579.3 mg L−1, respectively, after 14 days of growth and further exposure to molybdenum pollutant. The molybdenum removal capacity was further increased by optimizing crucial factors, pH and temperature before removing biomass from the aqueous phase. Zeta potential study helped to determine the pH range that appropriately facilitate the strongest possible ionic bonds, leading to the enhanced molybdenum adsorption. In order to verify molybdenum adsorption and comprehend the dominating and quantitative interactions, FTIR was carried out to analyze the reactive groups in the algal cell surface. The current work analyses to control external parameters for improving the adsorption efficiency during harvesting of microalgal biomass, which efficiently improved the removal of molybdenum (V) from the liquid phase. The proposed technique aims to improve the bioremediation efficiency of molybdenum and other inorganic contaminants at an industrial scale by using microalgal treatment.

Removal of Molybdenum from Contaminated Groundwater Using Carbide-Derived Carbon

In the present work, the removal of Mo from aqueous solutions and real groundwater by using the novel high-surface-area adsorbent carbide-derived carbon (CDC) was performed. The adsorbent was characterized using X-ray photoelectron spectroscopy (XPS), X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDS), Brunauer, Emmett, and Teller (BET) surface area analysis, and Fourier-transform infrared spectroscopy (FTIR). The effect of the operational parameters (contact time, CDC loading, Mo concentration, and pH) on the adsorptive performance of the sorbent in the batch adsorption mode was studied. The experimental work revealed that the adsorption of Mo onto CDC is a very fast process and provides 99% Mo removal in less than 30 min. The adsorption process was pH-dependent, achieving the maximum adsorptive removal at a pH range of 3–5. The highest adsorption capacity corresponded to 16.24 mg/g at a Mo concentration of 10 ppm, adsorbent loading of 0.6 g/L, and pH 3. Four models were used to analyze the adsorption isotherms of Mo onto CDC, which were Freundlich, Langmuir, Temkin, and Sips. The obtained adsorption results were also processed using four adsorption kinetic models: intra-particle diffusion, Elovich, second-order, and pseudo-first-order. The adsorption of Mo onto CDC was found to fit the Freundlich isotherm model, as confirmed by the highest R2 values (0.9118) and lowest SSE (0.4777), indicating the heterogeneous multilayer adsorption of Mo onto CDC. Likewise, the experimental adsorption data were found to be more consistent with the pseudo-second-order model. The main adsorption mechanisms contributing to Mo adsorption were found to be electrostatic interactions and ligand–ligand exchange, in addition to surface complexation or ion exchange between Mo ions and oxygen-containing groups on the CDC’s surface. Moreover, the removal efficiency under acidic conditions (pH: 3) was found to be stable and high (>99%), regardless of the Mo concentration (0.5–10 ppm) due to the characteristic PZC corresponding to CDC (pH 9.9). A performance test of the CDC using both real groundwater and GW spiked with 570 µg/L Mo showed an almost complete removal of Mo from GW. The regeneration tests confirmed that adsorbed Mo can be recovered from CDC by pH adjustment and the regenerated CDC can be reused.

Removal of molybdenum from wastewater using modified amino‐functional framework: A study of the adsorption properties

AbstractHerein, we have employed a convenient method to study kinetic and thermodynamic parameters of the adsorption of molybdenum from wastewater by using modified Zr‐based metal–organic frameworks, UIO‐66‐NH2‐X, as adsorbents. The frameworks were fabricated with a simple and fast method from terephthalic acids and Zirconium metal ions and modified via introduction of aldehyde groups using imine condensation. This is the first report in which MOFs have been utilized as adsorbents in molybdenum adsorption. The prepared adsorbents show high adsorption efficiency, which is representative of an improvement compared to other literature. The adsorption capacity and molybdenum removal for the modified framework are 667 mg/g and 93%, respectively which is a significant and remarkable value among other previously reported articles. The experimental adsorption data could be well interpreted with the pseudo‐second‐order kinetics and the Langmuir isotherm model. Thermodynamic studies illustrated a spontaneous exothermic mechanism for the adsorption process.

A novel method for preparing tungsten and molybdenum peroxy complex solution and its application to tungsten - molybdenum separation

Aiming at the shortcomings of existing separation technology of tungsten (W) and molybdenum (Mo) by hydrogen peroxide (H2O2) complexation, the chemical behaviors of W(VI) and Mo(VI) in aqueous solutions were studied and a new method for preparing W(VI)-Mo(VI)-H2O2 solution was proposed. By using trialkyl phosphine oxide-tributyl phosphate (TRPO-TBP) as a mixed extractant system, the applications of this new method on separation of W and Mo were conducted, including the effect on third phase formation and elimination, satisfactory removal of Mo, and separation efficiency of Mo and W. The results show that the formation and depolymerization of isopoly and heteropoly compounds of W and Mo have an important influence on their separation. The core of the new method lies in the control of pH value when W and Mo begin to complex with H2O2. The formation of metatungstate and heteropoly compounds with high Mo/W atomic ratio could be avoided by adding H2O2 into the mixed solution of tungsten and molybdenum in a high pH range of 5.3–6.5 for complexation. Based on this principle, this method could not only avoid the third phase formation at the source but also effectively improve the satisfactory removal of molybdenum. As the complexation pH value increased from 3.51 to 5.51, after six-stage countercurrent extraction of feed solution containing about 127.8 g/L WO3 and 16.10 g/L Mo, the mass ratio of Mo/WO3 in raffinate decreased from 5.94 × 10−4 to 2.71 × 10−5 and the molybdenum content decreased from 77.50 mg/L to 3.54 mg/L. This study provides a relevant theoretical foundation and feasible improvement for the satisfactory separation of W and Mo from peroxy complex solution system, and is expected to facilitate the industrialization of this technology.

High efficient removal of molybdenum(VI) from aqueous solution by starch-acrylamide/nanohalloysite composite

In this paper, poly(starch-acrylamide/nanohalloysite) [P(St-AAm/NH)] was prepared by grafting acrylamide onto starch using gamma rays as an initiator. Physical characteristics of the newly synthesized nanocomposite were studied using FT-IR, TGA, DTA and SEM. P(St-AAm/NH) was evaluated for adsorption of Mo(VI) radionuclide from aqueous solution using batch sorption experiments. Factors affecting adsorption of Mo(VI) radionuclide, such as pH, contact time, and metal ion concentration were extensively investigated. P(St-AAm/NH) composite shows high sorption capacity of 524 mg g−1 towards Mo(VI) radionuclide. Finally, Mo(VI) radionuclide sorption was best represented by the pseudo-second-order kinetic model. As well, it was best fitted to Langmuir model, which suggests the chemisorption mechanism.

Removal of Molybdenum from Mining-Impacted Water by Sorption onto Manganese-Rich Sludge

Removal of Molybdenum from Mining-Impacted Water by Sorption onto Manganese-Rich Sludge

Adsorption of Molybdenum from Wastewater by Surface Altered Agricultural Solid Waste

The palm fruit husk, an agricultural solid waste does not adsorb Mo(VI). The intent of this endeavor was to estimate the adsorption capacity of the SAPFH towards Mo (VI) in wastewater. Hence the surface was altered using a surface activating group, cetyl trimethyl ammonium bromide (CTAB). The husk of the palm fruit, whose surface was modified, was subjected to evaluate the extent of extracting molybdenum that is present in aqueous solution. The maximal removal of molybdenum occurs at pH 2.0. The adsorbent dose necessary for the maximum adsorption of MoO42- was lesser for wastewater than for pure aqueous solutions. MoO42- took longer time to attain equilibrium at high concentrations. The stability results were suited with Langmuir, Freundlich and Dubinin-Raduskevich adsorption isotherms models. Dynamic investigation revealed that the uptake obeyed pseudo second order kinetic effigy. The adsorption of adsorbates did not change significantly with increase in temperature. Desorption of Mo (VI) showed that it is possible to retrieve Mo (VI) from the spent adsorbent. The influence of accompanying negative ions such as chloride, phosphate, sulphate and chromate on the Mo (VI) uptake was explored and the anions compete with Mo(VI) ions.

Removal of molybdenum(VI) by nanoscale iron sulfide: kinetics and influence factors

Removal of molybdenum(VI) by nanoscale iron sulfide: kinetics and influence factors

Isothermal, Kinetic, and Thermodynamic Studies on the Adsorption of Molybdenum by a Nanostructured Magnetic Material

In this study, the magnetic 3-(trimethoxysilyl) propyl methacrylate (TMSPMA) – poly (4-vinylpyridine) (P4VP) was synthesized and characterized. Removal of Molybdenum (Mo) from aqueous solutions using prepared material as nanosorbent was investigated. The magnetic P4VP was prepared by copolymerization of P4VP with TMSPMA. The prepared adsorbent was characterized by various techniques including the X-ray powder diffraction (XRD), scanning electron microscopy (SEM), and Fourier-transform infrared spectroscopy (FTIR). The batch adsorption technique was applied and the effect of several important parameters such as pH of the aqueous solution, adsorbent dose, initial Mo(VI) concentration, contact time, and temperature was evaluated. Desorption behavior of Mo(VI) and the effect of foreign ions (Cd2+, Ca2+, Co2+, Fe3+, Ba2+ and Pt4+) in real samples were also investigated. Co (II) and Pt (IV) had a greater impact on the adsorption process than other foreign ions. The maximum capacity for Mo(VI) adsorption on the prepared adsorbent was 4.87 mg/g, which was obtained at a temperature of 40°C with an initial concentration of 10 mg/L of Mo(VI). The adsorption isotherms were best fitted with the Weber Van Vliet isotherm model. The kinetic data were fitted well with the pseudo-second-order equation with a high correlation coefficient (R2 > 0.99). Based on the negative standard Gibbs free energy change (ΔG° < 0) and the positive standard enthalpy change (ΔH° > 0), it was found that the adsorption was an endothermic and a spontaneous process in nature.

Preparation and properties of novel activated carbon doped with aluminum oxide and silver for water treatment

Novel activated carbon (AC) composite materials, namely AC doped with aluminum oxide (Al2O3) and AC doped with Al2O3 and silver (Ag) nanoparticles, have been prepared via a one-step thermal decomposition method. The developed composite materials were used to study the adsorptive removal of molybdenum (Mo) and arsenic (As) from contaminated water. Several techniques, including X-Ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron spectroscopy (SEM), energy dispersive X-Ray spectroscopy (EDS), and thermal gravimetric analysis (TGA), were used to characterize the synthesized materials. TGA results show that the material is very stable and decay starts only above 450 °C. The effects of pH on the adsorptive removal of As and Mo on AC-Al2O3 have also been studied. The prepared AC-Al2O3 material showed 94% removal of total As at pH of 6% and 97% removal of Mo at pH 2. The pollutants removal is due to electrostatic attraction and ligand exchange adsorption mechanisms. It was also found that the novel AC-Al2O3-Ag composite materials exhibit notable antibacterial properties towards both Gram-negative (Escherichia coli) and Gram-positive (Bacillus subtilis) bacteria.

Removal of Molybdenum(VI) from Raw Water Using Nano Zero-Valent Iron Supported on Activated Carbon

Traces of Molybdenum (Mo) in drinking water pose potent dangers owing to its harmful effects on the health of humans. This study used nanoscale zero-valent iron (Fe0) supported by activated carbon (NZVI/AC) for removing Mo(VI) from raw water. In an attempt to gain an understanding of the various factors that affect the process, we designed the study to look into the impact of various experimental parameters including pH, adsorption kinetics, and coexisting ions on the Mo(VI) removal using fixed-bed column runs and a batch-adsorption method and for Mo(VI) removal using NZVI/AC. The optimum conditions were found to be pH 4.5 and an equilibrium time of 9 h and 72 h for simulation water (SW) and raw water (RW), respectively. The removal of Mo(VI) was remarkably inhibited by the presence of silicate (SiO42−) and phosphate (PO43−), while the impact of humic acid and some other anions was insignificant. Metal cations such as Fe3+, Al3+, Zn2+, and Ni2+ enhanced the adsorption of Mo(VI). The influent contaminant concentration Mo(VI) in raw water was found to be 0.1603 mg/L, the empty-bed contact time (EBCT) was 3 and 6 min, whereas the breakthrough empty-bed volumes were 800 and 1100 and at the value of 70 μg/L provided by WHO provisional guidelines, respectively.

The adsorptive removal of Mo(VI) from aqueous solution by a synthetic magnetic chromium ferrite nanocomposite using a nonionic surfactant

A magnetic chromium ferrite (CrFe2O4) nanocomposite was prepared through the sonochemical method in the presence of oleic acid as a nonionic surfactant. The produced powder was further characterized using energy dispersive spectroscopy (EDX), X-ray diffraction (XRD), a vibrating sample magnetometer (VSM) technique, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Fourier transform infrared (FTIR) spectroscopy. SEM and TEM images showed the surface morphology and formation of nanosized particles. The removal of molybdenum (VI) from fission products was studied using a magnetic CrFe2O4 nanoadsorbent by the batch adsorption technique. The point of zero charge, pHPZC, of the magnetic ferrite was determined by the solid addition method. Adsorption was successfully described using a pseudo-second-order model. The Langmuir and Toth models were capable of perfectly fitting the equilibrium data. Additionally, the thermodynamic parameters were obtained. The desorption amount of molybdenum ions reached the maximum value (exceeding 99%) when using 1.0 mol/L NaOH. These results suggested that the magnetic CrFe2O4 nanoadsorbent was an adsorbent that could be potentially used for the successful removal of molybdenum (VI) from a mixture of metal ions found in fission products.

Continuous solvent extraction operations for the removal of molybdenum from ammonium tungstate solution with quaternary ammonium salt extractant

The continuous solvent extraction operations for the removal of molybdenum from ammonium tungstate solution was conducted using a solvent extraction system consisting of 10% (v/v) N263 as extractant and 30% (v/v) isooctanol as modifier in sulfonated kerosene for 63 h under optimized conditions in mixer-settlers. The concentration of Mo in raffinate was less than 10 mg/L with mass ratio of Mo/WO3 less than 6.0 × 10−5 and the concentration of Mo in strip liquor reached 30 g/L with mass ratio of WO3/Mo less than 1.0 × 10−2, which was consistent with the results of batch tests. The loaded organic solution and the oxidized organic solution were characterized by infrared spectroscopy and the results demonstrated that molybdenum exists in the form of [Mo2O11(H2O)2]2− in oxidized organic solution. The theoretical calculation of temperature change of the organic solution in oxidation process was conducted. The oxidant of 7 wt% H2O2 was recommended to be used during industrial production and a cooling water system has to be installed around the oxidation tank at the same time.The new process exhibited significant advantages of low overall costs, large value increase due to molybdenum producibility of MSA and environmental friendliness without wastewater and residue generation.

Non-conservative behavior of dissolved molybdenum in hypersaline waters of the Guerrero Negro saltern, Mexico

Trace metal distribution and speciation studies in hypersaline systems are scarce because of the difficulty in measuring low metal concentrations in high salinity (S) waters. In this study, dissolved molybdenum (MoD) was measured in samples collected in the hypersaline Ojo de Liebre Lagoon and evaporation ponds of the Guerrero Negro saltern, Baja California Peninsula, Mexico. MoD was extracted from these hypersaline waters with a modification of a method originally developed to measure this element in natural waters (S < 36). In general, MoD concentrations ranged from 42 to 241 nM along the hypersaline gradient, well below those predicted from simple seawater evaporation, indicating non-conservative behavior of MoD relative to salinity. The magnitude of the removal process was reflected in both the high calculated MoD fluxes toward the sediment/microbial mat (2.2 ton yr−1), and the very short residence time of MoD (4.1 yr) in the water column of the evaporation ponds. These findings suggest that sediments/microbial mats and also gypsum from current hypersaline environments act as important, but as yet unquantified, MoD sinks. Removal of MoD in hypersaline environments may have been especially important during the geological past, when these environments were more prevalent and extensive, and thus capable of influencing the global Mo cycle as well as, indirectly, the nitrogen cycle.

Effect of Boron on Hot Ductility and Room-Temperature Tensile Properties of Microalloyed Steels with Titanium and Niobium.

Effect of boron on the hot ductility and room-temperature tensile properties of Ti-Nb-microalloyed steels containing 0.071 wt.% carbon was studied. The thermal stress and thermal strain of continuous casting billets during cooling were simulated via hot tensile tests at the deformation rate of (6 mm/11,000)/s, and the hot ductility of different microalloyed steels was evaluated according to the area reduction of hot tensile specimens. It was found that boron addition was beneficial to improve the hot ductility of continuous casting billets during straightening, and the reduction of area exceeded 60%. The addition of boron, as well as the removal of molybdenum and vanadium, can effectively lower the austenite-to-ferrite transformation temperature and restrain the formation of intergranular ferrite, so as to avoid the brittle zone. Moreover, the room-temperature tensile properties of the steels were explored at different cooling rates after the rolling process. The results showed that as the cooling rate increased from 0.0094 to 0.13 °C/s, the amount of carbonitride precipitate gradually decreased, such as titanium carbide, leading to the relatively low tensile strength. On the other hand, the addition of boron, as well as the removal of Mo and V, promoted the formation of bainite and acicular ferrite, playing an important role in structure strengthening, and compensated for the decrease of tensile strength caused by the low precipitation strengthening.

Study on removal of molybdenum from ammonium tungstate solutions using solvent extraction with quaternary ammonium salt extractant

A new process for the removal of molybdenum from ammonium tungstate solutions using solvent extraction with quaternary ammonium salt extractant was proposed. The molybdenum can be selectively extracted over tungsten using a solvent extraction system consisting of 10% (v/v) N263 as extractant and 30% (v/v) isooctanol as modifier in sulfonated kerosene. The separation coefficient βMo/W reached 1 × 104.A continuous operation test was conducted using an industrial feed containing 2.2 g/L Mo and 258 g/L WO3. The concentration of Mo in raffinate decreased to <1 mg/L with mass ratio of Mo/WO3 <4.0 × 10−6 in four-stage counter current batch-continuous extraction at an A/O ratio of 3:1. After scrubbing, the loaded organic solution was first oxidized using 7% H2O2 followed by stripping using a mixed solution of 3 mol/L NH4HCO3 and 3 mol/L NH3·H2O in six counter current stages at an A/O ratio of 1:8. The stripping of molybdenum reached almost 100%, resulting in 62.1 g/L Mo and 0.96 g/L WO3 in the strip liquor with the WO3/Mo mass ratio of 0.015.This new process exhibited big advantages of wide adaptability, low tungsten loss, high value of molybdenum products, low cost and environmental friendliness.

Application of the liquid-phase polymer-based retention technique to the sorption of molybdenum(VI) and vanadium(V)

This research is focused on molybdate and vanadate removal from aqueous solutions by the liquid-phase polymer-based retention (LPR) technique. In this technique, a cationic water-soluble polymer based on the ammonium quaternary group poly(diallyldimethylammonium chloride), PDDA, was used as a polymeric sorbent, and a regenerated cellulose ultrafiltration membrane was used as a filter. The removal of molybdenum and vanadium using the LPR technique was analyzed by both the washing and enrichment methods. The removal experiments using the washing method were conducted by varying the pH, polymer/metal molar ratio, concentration of metal ions, pressure and presence of interfering ions. In addition, the enrichment method was used to determine the maximum retention capacity of PDDA. The obtained results showed the highest retention capacity of molybdate (100%, using 30 mg/L in the feed) for PDDA at pH 3 and 9. The optimum molar ratio was 20:1 polymer/Mo(VI). The efficient vanadate retention (approximately 90%) was obtained at pH 6 with 10:1 polymer/V(V) molar ratio. The effect of metal concentration on the retention showed a higher retention of Mo(VI) independent of its concentrations. In the case of V(V), the maximum retention was reached when 60 mg/L of vanadium was used in the feed. The enrichment method showed the maximum retention capacities of 370 mg Mo(VI)/g PDDA and 520 mg V(V)/g PDDA. The presence of interfering ions did not affect the retention capacity of PDDA. These results showed that the combination of PDDA with ultrafiltration membranes could represent an alternative method for the removal of molybdate and vanadate from water.

Removal of molybdenum(VI) from aqueous solutions using nano zero-valent iron supported on biochar enhanced by cetyl-trimethyl ammonium bromide: adsorption kinetic, isotherm and mechanism studies.

A new carbonized pomelo peel biosorbent (MCPP) modified with nanoscale zero-valent iron (NZVI) and cetyl-trimethyl ammonium bromide was prepared and employed for the adsorption of molybdate (Mo(VI)) from aqueous solution. We investigated the effects of various conditions on Mo(VI) adsorption and evaluated the results based on adsorption kinetics models and isotherm equations. The kinetic data fitted to the pseudo-second-order model. The Langmuir model best described the adsorption of Mo(VI) on MCPP. The values of changes in Gibbs free energy, standard enthalpy, and standard entropy revealed that the adsorption process was feasible, spontaneous and endothermal. X-ray diffraction, Fourier transform infrared and X-ray photoelectron spectroscopy measurements suggested that Mo(VI) adsorption occurred via both the reduction and surface adsorption. Thus, biochar, prepared from fruit residue, can be applied to remove Mo(VI) from aqueous solutions. More importantly, our results provide a sustainable approach for Mo(VI) removal from wastewater by means of functional modification.

Molybdenum mineralization related to the Yangtze's lower crust and differentiation in the Dabie Orogen: Evidence from the geochemical features of the Yaochong porphyry Mo deposit

The Dabie Orogen is a world-class case for large amounts of Mo mineralization in that it contains at least 10 porphyry Mo deposits with Mo metal reserves over 3Mt from the time period of 156–110Ma. However, the principal mechanism for the Mo mineralization remains controversial due to the lack of a precise definition of its source and shallow ore-forming process, which is essential to understand these rare large Mo deposits.Detailed geochronology, geochemistry, and isotopic data for ore-related granites and minerals were analyzed in order to place constraints on the massive Mo mineralization in the Dabie Orogen in eastern China. The Yaochong molybdenum orebodies were hosted in the transition belt and alteration zone between the granitic stocks and the Dabie Complex and were characterized as numerous veinlets with potassic, phyllic and propylitic alterations. The buried Yaochong granitic intrusions and associated molybdenum mineralization yield Early Cretaceous ages of magmatic activities at ca. 138Ma and extremely similar Re–Os isotope ages for the corresponding Mo metallogenic event at ca. 137Ma. The Yaochong monzogranite and granite porphyry belong to the highly fractionated I-type granites, which are believed to be derived from the dominantly Yangtze's lower crust mixed with the Northern Dabie Complex due to their geochemical and isotope features. The elemental diversity and isotopic homogeneity suggest that the formation of the Yaochong monzogranite involved the fractionation of biotite, garnet and minor feldspar and accessory minerals combined with a weak crustal assimilation process. In contrast, the granite porphyry was possibly generated by the partial melting of the same mixed lower continental crust via the differentiation process involving the fractionation of feldspar, apatite, and/or titanite. Fractional crystallization processes can significantly elevate the molybdenum concentration in the residual melts. The biotite fractional crystallization results in removal of molybdenum from the vestigial magma since molybdenum is compatible with it, which may account for the barren monzogranite with a low-grade molybdenum mineralization. The ore-bearing granite porphyry has more source materials from the Yangtze's lower crust, which may have contributed most of the molybdenum for the porphyry-related molybdenum deposits in the Dabie metallogenic zone. This porphyry molybdenum aggregation may have been deposited in a post-collision or intracontinental extensional setting.