Sulfur fixation method of roasting low-grade molybdenite concentrate through lime method

A molybdenum concentrate, low-grade technology, applied in the field of molybdenum metallurgy, can solve problems such as poor sulfur fixation effect, and achieve the effects of reducing dosage, improving sulfur fixation efficiency, and inhibiting molybdenum grade depletion

Active Publication Date: 2015-12-02
CENT SOUTH UNIV +1
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  • Description
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Problems solved by technology

[0008] Aiming at the defect that the sulfur fixation effect of low-grade molybdenum concentrates is relatively poor in the existing technology of lime method roasting-acid leaching process, the purpose of the present invention is to provide a sulfur fixation agent suitable for low-grade molybdenum concentrates , and at the same time construct a reasonable low-grade molybdenum concentrate pellet structure to achieve not only improving the oxidation efficiency of molybdenite, but also reducing the SO in the roasting process. 2 method of escape

Method used

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  • Sulfur fixation method of roasting low-grade molybdenite concentrate through lime method

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Embodiment 1

[0026] For the molybdenum concentrate with a molybdenum grade of 39.27wt% and a sulfur content of 29.73wt% (the chemical composition of raw materials is shown in Table 1), the molybdenum concentrate is divided into two parts according to the mass ratio of 4:6; 200ml 4N-HCl , Quicklime with a particle size of 100% less than 0.074mm, the molar ratio of Ca / S in the mixture is 1:1, and the mass fraction of the mixture is 4% MnO 2 ;Add 300ml of activity to the second part of molybdenum concentrate 4N-HCl , 100% of particle size is less than quicklime of 0.074mm, make the molar ratio of Ca / S in the mixture be 1.5:1, and add NaOH accounting for 2% of the mixture mass fraction; put the first part of the mixture in the disc pelletizer Prepare a 6mm spherical core, and then add the spherical core to the second disc pelletizer, and perform secondary pelletizing together with the second part of the mixture to obtain core-shell structure molybdenum concentrate pellets; molybdenum concentr...

Embodiment 2

[0029]For the molybdenum concentrate with a molybdenum grade of 44.13wt% and a sulfur content of 33.70wt% (the chemical composition of raw materials is shown in Table 1), the molybdenum concentrate is divided into two parts according to the mass ratio of 6:4; 250ml 4N-HCl , Quicklime with a particle size of 100% less than 0.074mm, the molar ratio of Ca / S in the mixture is 0.5:1, and the mass fraction of the mixture is 2% MnO 2 ; Add activity to the second part of molybdenum concentrate is 330ml 4N-HCl 100% quicklime with a particle size of less than 0.074mm, the molar ratio of Ca / S in the mixture is 2:1, and the addition of 5% Na 2 CO 3 ;Prepare the first part of the mixture into a 4mm ball core in the disc pelletizer, then add the ball core to the second disc pelletizer, and carry out secondary pelletizing together with the second part of the mixture to obtain the core Shell structure molybdenum concentrate pellets; the molybdenum concentrate pellets are distributed on the...

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Abstract

The invention discloses a sulfur fixation method of roasting a low-grade molybdenite concentrate through a lime method. The sulfur fixation method comprises the steps that the low-grade molybdenite concentrate is divided into two parts; one part is mixed with quick lime and MnO2 for pelletizing; obtained pellets, the other part of the low-grade molybdenite concentrate, high-activity quick lime and NaOH or Na2CO3 are mixed for secondary pelletizing, and low-grade molybdenite concentrate pellets of core-shell structures are obtained; the obtained low-grade molybdenite concentrate pellets are dried and roasted in sequence, and reactions including molybdenite concentrate oxidation and sulfur fixation occur. By means of the sulfur fixation method, the concentration of SO2 in roasting flue gas can be reduced to below 200 mg / Nm<3>, the requirements for flue gas emission are met, and it is guaranteed that the molybdenum leaching rate through calcining and acid leaching reaches over 98%.

Description

technical field [0001] The present invention relates to a sulfur-fixing method for low-grade molybdenum concentrate roasted by lime method, in particular to combining molybdenum concentrate with a suitable sulfur-fixing agent and preparing it into pellets with reasonable structure, so that it can be roasted in molybdenum concentrate by lime method. The method realizes molybdenite oxidation and high-efficiency sulfur fixation in the process; it belongs to the technical field of molybdenum metallurgy. Background technique [0002] Molybdenum is a rare metal with high strength, high melting point, abrasion resistance, corrosion resistance, etc. It is widely used in metallurgy, aerospace, optoelectronic materials and other fields. With the continuous mining of molybdenum ore resources, high-grade molybdenum resources are increasingly scarce, and high-quality resources are far from meeting market demand. Therefore, poor, fine, miscellaneous and other refractory ores have graduall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B34/34
Inventor 甘敏范晓慧张麟姜涛邱冠周邓琼王勇陈许玲李光辉曾祥龙程志华李伟汤雁斌袁礼顺王送荣汪国靖
Owner CENT SOUTH UNIV
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