Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A kind of sulfur fixation method of low-grade molybdenum concentrate calcined by lime method

A molybdenum concentrate and low-grade technology, which is applied in the field of molybdenum metallurgy, can solve the problems of poor sulfur fixation effect, achieve the effects of reducing the dosage, strengthening sulfur fixation, and suppressing the depletion of molybdenum grade

Active Publication Date: 2017-12-05
CENT SOUTH UNIV +1
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of sulfur fixation method of low-grade molybdenum concentrate calcined by lime method

Examples

Experimental program
Comparison scheme
Effect test

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention discloses a sulfur fixation method for low-grade molybdenum concentrate roasted by lime method. The method is to divide the low-grade molybdenum concentrate into two parts, one part is mixed with quicklime and MnO2 to make pellets, and the obtained pellets are combined with the other part of low-grade The mixture composed of molybdenum concentrate and high-activity quicklime and NaOH or Na2CO3 is subjected to secondary pelletizing to obtain low-grade molybdenum concentrate pellets with a core-shell structure; the obtained low-grade molybdenum concentrate pellets are sequentially dried and roasted to produce Reactions including molybdenum concentrate oxidation and sulfur fixation. The method can reduce the concentration of SO2 in the roasting flue gas to below 200mg / Nm3, which meets the requirement of flue gas emission, and ensures that the molybdenum leaching rate of calcination acid leaching is above 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com