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Method and device for reducing impurities in roasted molybdenum concentrate

A molybdenum concentrate and roasting technology, applied in chemical instruments and methods, molybdenum compounds, process efficiency improvement, etc., can solve problems such as low efficiency and environmental problems, achieve high cost efficiency, low labor intensity, and eliminate precipitation K the dangerous effect of

Pending Publication Date: 2022-08-02
몰리메트벨지엄엔브이
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A disadvantage of the method described in US4643884 is that the removal of potassium is achieved by using a solution containing nitric acid and ammonium nitrate, which can create environmental problems if they become part of the wastewater as nitrate, and moreover, ammonium nitrate is are potentially explosive and therefore require additional safety measures during production
Another disadvantage of the method described in US4643884 is that several leaching steps are required, so this is generally inefficient on an industrial scale, and several separation steps are required to separate the molybdenum trioxide from the leach, resulting in a A more energy- and labor-intensive method for potassium removal

Method used

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  • Method and device for reducing impurities in roasted molybdenum concentrate
  • Method and device for reducing impurities in roasted molybdenum concentrate
  • Method and device for reducing impurities in roasted molybdenum concentrate

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Embodiment approach

[0013] According to a preferred embodiment of the present invention, the method comprises the step of adding a predetermined amount of water prior to the step of adding at least a portion of the first treated suspension to the acid solution to form the second treated suspension to the first reactor, the first series of reactors, the second reactor or the second series of reactors such that the temperature of at least a portion of the first treated suspension is below 70°C. In addition to the advantages of the previous embodiments, another advantage of this embodiment is that the temperature of at least a portion of the first treated suspension can be lowered to the desired temperature more easily and faster than by natural convection cooling . In addition, the leaching efficiency of potassium can be unaffected, while the leaching efficiency of other impurities can be improved.

[0014] According to a preferred embodiment of the present invention, in step a., the temperature o...

Embodiment A

[0060] 400 g of RMC was placed in 1050 ml of water to form a slurry. Initially, the temperature of the slurry was set to about 75°C and maintained at this temperature throughout the reaction time (ie 2.5 hours). After 2.5 hours, the filter cake was filtered and washed on the filter with 1050 ml of water. from figure 1 It can be seen that the impurities of potassium are mostly leached, while the impurities of iron and copper are poorly leached.

Embodiment B

[0062] 400 g of RMC was placed in 1050 ml of water to form a slurry. At the beginning, the temperature was set at 75°C and did not change throughout the reaction time, and also from the beginning, a solution of hydrochloric acid was added to the slurry to bring the pH of the slurry to about 1.9. Different concentrations of hydrochloric acid can be used. The reaction time was 2.5 hours. After 2.5 hours, the filter cake was filtered and washed on the filter with 1050 ml of water. from figure 1 It can be seen that most of the potassium impurities are leached out, and compared with Example A, the iron and copper impurities in Example B are leached better.

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Abstract

The present invention provides a method of reducing impurities in roasted molybdenum concentrate (RMC) comprising the steps of: subjecting a portion of RMC to a first treatment in a first reactor to form a first treated suspension, the first treatment comprising adding a portion of RMC to an aqueous solution wherein the temperature of the first treated suspension is from 10 DEG C to 100 DEG C, and the first treated suspension comprising a second treatment comprising adding a portion of RMC to the aqueous solution; and having a first pH value of from 2.1 to 5.0; subjecting a portion of the first treated suspension to a second treatment in a second reactor, the second treatment comprising adding the portion of the first treated suspension to an acid solution to form a second treated suspension, where the portion of the first treated suspension has a temperature lt; 70 DEG C, and wherein the second treated suspension has a second pH between 1.5 and the first pH; and separating a portion of the second treated suspension from the reactor.

Description

technical field [0001] The present invention relates to a method for reducing impurities in roasted molybdenum concentrate (RMC) and compositions obtained therefrom, and an RMC treatment unit suitable for carrying out the method. Background technique [0002] In nature, molybdenum is mainly composed of molybdenum ore molybdenite (MoS 2 ) in the form of. In many applications of molybdenum, molybdenite is oxidized to molybdenum oxide, which is then mainly used to produce molybdenum-containing alloys and catalysts. Molybdenite (MoS 2 ) can be oxidized to molybdenum oxide in two ways. The first and most common oxidation method is the roasting of molybdenum ore in a roaster in the presence of air. It is well known that ores or concentrates, preferably molybdenum (MoS 2 ) concentrate, which can be processed into roasted molybdenum concentrate by roasting the molybdenum-containing ore or concentrate. A second option to obtain higher purity molybdenum oxide is to oxidize molyb...

Claims

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Application Information

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IPC IPC(8): C01G39/02C22B3/02C22B3/08C01G39/00
CPCC01G39/02C01P2006/80C22B3/02C01G39/00C22B34/22C22B1/00Y02P10/20C22B1/005C22B34/34C22B9/103C01G39/003C22B3/00
Inventor G·普罗沃斯特D·兰根德里斯
Owner 몰리메트벨지엄엔브이