Chemistry and Mechanism of Interaction Between Molybdenite Concentrate and Sodium Chloride When Heated in the Presence of Oxygen

Aleksandrov, P. V.; Медведев, А. С.; Imideev, V. A.; Moskovskikh, Dmitry

doi:10.1007/s11663-016-0889-1

Cited by 4 publications

(3 citation statements)

References 19 publications

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“…23 Oxidation roasting is further classified into sodium/calcification roasting 24−26 and chlorination roasting. 27,28 Sodium/calcification roasting is currently the most widely used additive roasting process. The main additives used are Na 2 CO 3 , NaNO 3 , Ca(OH) 2 , CaCO 3 , and CaO.…”

Section: ■ Introductionmentioning

confidence: 99%

“…At present, research on the pyrometallurgical process of molybdenite mainly focuses on oxidation roasting, − microwave roasting, − direct pyrolysis, − and reduction roasting . Oxidation roasting is further classified into sodium/calcification roasting − and chlorination roasting. , Sodium/calcification roasting is currently the most widely used additive roasting process. The main additives used are Na 2 CO 3 , NaNO 3 , Ca(OH) 2 , CaCO 3 , and CaO.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of the Roasting Behavior of Mixtures of Molybdenum Trioxide and Molybdenum Concentrates

Zhang

Jiang

Song

et al. 2022

ACS Sustainable Chem. Eng.

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In this paper, a new process of roasting molybdenum concentrates with the addition of molybdenum trioxide (MoO 3 ) was proposed. Using molybdenum disulfide (MoS 2 ) to represent molybdenum concentrates and based on theoretical studies and experimental investigations, the roasting behavior and reaction routes were identified by thermodynamic calculations, thermogravimetric analysis, and characterization of the reaction process and reaction products. The effects of the MoO 3 /MoS 2 ratio, reaction time, and temperature as well as the forming pressure of pellets on the solid−solid reaction of MoO 3 and MoS 2 were investigated, and the products were characterized using X-ray diffraction, scanning electron microscopy, and carbon−sulfur analysis. The optimum MoO 3 /MoS 2 ratio was determined as 6.5, and the optimum reaction conditions were a temperature of 650 °C and a holding time of 60 min. The particle size of MoO 2 increased gradually with the extension of the holding time, and finally, MoO 2 particles with a particle size of 1.1 μm could be obtained. The sulfur content of the product MoO 2 decreased significantly with the increase in the MoO 3 /MoS 2 ratio or reaction temperature, and after this desulfuration process, the minimum sulfur content of the products was 98 ppm. Comparing powder samples with molded samples formed at 50 MPa revealed that a certain pressure promoted the reaction with an efficiency increase of about 14.6%.

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Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation of the Roasting Behavior of Mixtures of Molybdenum Trioxide and Molybdenum Concentrates

Zhang

Jiang

Song

et al. 2022

ACS Sustainable Chem. Eng.

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show abstract

“…The advantages lie in no SO 2 emission but the impurities such as iron, calcium, magnesium, phosphorus and arsenic et al are also dissolved in the leaching solutions. In fact, the advantage of leaching molybdenum under basicity and common temperature and pressure conditions from low-grade roasted molybdenite concentrate is in evidence, although the process lets out the harmful gas but it can be deleted through adding Na 2 CO 3 , NaNO 3 or NaCl in roasting process [23][24][25][26][27], but the main existing methods leaching molybdenum with sodium carbonate or ammonium hydroxide aqueous solution need multi-stage leaching process, following more equipment, longer time and lower leaching efficiency [28,29].…”

Section: Introductionmentioning

confidence: 99%

Leaching molybdenum from a low-grade roasted molybdenite concentrate

et al. 2019

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A technique for leaching molybdenum from low-grade roasted molybdenite concentrate was proposed by the aqueous solution containing sodium chlorate and sodium carbonate. The effect of molar ratio of sodium chlorate to molybdenum, leaching time, liquid-solid ratio, leaching temperature, sodium carbonate concentration and agitating speed on leaching rate of molybdenum was studied. The experimental results showed that the temperature and concentration of sodium carbonate are key factors to influence the leaching efficiency of molybdenum, and leaching rate achieves above 98% when the molar ratio of sodium chlorate to molybdenum is up 13.5, the temperature is 343.15 K, the agitating speed is 500 rpm, the liquid-solid ratio is 10:1 and the concentration of sodium carbonate is above 10 g/L. The leaching process was mainly controlled by chemical reaction and mass transfer. The leaching time is shorter and the heavy metal content in leaching aqueous solution is lower in basicity than those in acid situations.

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Processing of Copper-Containing Molybdenite Concentrates by Roasting with Sodium Salts to Produce Technical Molybdenum Trioxide

et al. 2021

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Chemistry and Mechanism of Interaction Between Molybdenite Concentrate and Sodium Chloride When Heated in the Presence of Oxygen

Cited by 4 publications

References 19 publications

Investigation of the Roasting Behavior of Mixtures of Molybdenum Trioxide and Molybdenum Concentrates

Investigation of the Roasting Behavior of Mixtures of Molybdenum Trioxide and Molybdenum Concentrates

Leaching molybdenum from a low-grade roasted molybdenite concentrate

Processing of Copper-Containing Molybdenite Concentrates by Roasting with Sodium Salts to Produce Technical Molybdenum Trioxide

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