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A method for separating molybdenum and rhenium from rhenium-containing molybdenum concentrate

A technology of molybdenum concentrate and concentrate, which is applied in the field of molybdenum metallurgy, can solve the problems that molybdenum concentrate is easily brought into the flue gas, the oxidation rate of rhenium and molybdenum is low, and the recovery rate of molybdenum is low, so as to avoid the formation of by-products , optimize roasting conditions, improve the effect of oxidation efficiency

Active Publication Date: 2016-01-20
DAYE NONFERROUS METALS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] The purpose of the present invention is to solve the problems of insufficient oxidation, low oxidation rate of rhenium and molybdenum when the rhenium-containing molybdenum concentrate is separated by the oxidation roasting method, and the fine-grained molybdenum concentrate is easily carried into the flue gas , while the low flue gas temperature leads to the Re in the flue gas 2 o 7 Easy to be reduced to ReO which is insoluble in water 2 , the problem of low recovery rate of rhenium and molybdenum, providing a method for separating molybdenum and rhenium from rhenium-containing molybdenum concentrate

Method used

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  • A method for separating molybdenum and rhenium from rhenium-containing molybdenum concentrate
  • A method for separating molybdenum and rhenium from rhenium-containing molybdenum concentrate

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Effect test

Embodiment 1

[0031] (1) Add a binder and an oxidant to the rhenium-containing molybdenum concentrate with a molybdenum grade of 40%, a rhenium grade of 0.034%, and a particle size of ≤200 mesh, and then add water with a concentration of 3.0% and stir evenly. It is prepared into rhenium-molybdenum concentrate pellets 1 with a particle size of 3mm and a water content of 12% by using a disc pelletizer; the binder is any one of polyvinyl alcohol or polyacrylamide, which is added The amount is 0.04% of the mass of rhenium-containing molybdenum concentrate; the oxidant is MnO 2 , its addition amount is 3.0% of the mass of the rhenium-containing molybdenum concentrate, and the main active ingredient of the rhenium-containing molybdenum concentrate is molybdenite MoS 2 , rhenium pyroxene ReS 2 ;

[0032] (2) Spread the rhenium-molybdenum concentrate pellets on the grate bed 3 of the grate machine 2 with a cloth thickness of 50mm, and then let the rhenium-molybdenum concentrate pellets enter the ...

Embodiment 2

[0038] (1) Add a binder and an oxidant to the rhenium-containing molybdenum concentrate with a molybdenum grade of 30%, a rhenium grade of 0.02%, and a particle size of ≤200 mesh, and mix well, then add water with a concentration of 2.0% and stir evenly, Use a cylinder granulator to prepare it into rhenium-molybdenum concentrate pellets with a particle size of 4mm and a moisture content of 10%; the binder is any one of polyvinyl alcohol or polyacrylamide, and the amount added It is 0.06% of the mass of rhenium-containing molybdenum concentrate; the oxidant is MnO 2 , its addition amount is 2.0% of the mass of rhenium-containing molybdenum concentrate;

[0039] (2) Spread the rhenium-molybdenum concentrate pellets on the grate bed of the grate machine with a cloth thickness of 60mm, and then let the rhenium-molybdenum concentrate pellets enter the preheating chamber of the grate machine with the Dry for 25 minutes at 185°C and a drying wind speed of 1.5m / s, so that the moistur...

Embodiment 3

[0045] (1) Mix the rhenium-containing molybdenum concentrate with a molybdenum grade of 50%, a rhenium grade of 0.1%, and a particle size of ≤200 mesh with a binder and an oxidant, and then add water with a concentrate mass of 2.5% and stir evenly. It is prepared into rhenium-molybdenum concentrate pellets with a particle size of 5mm and a water content of 11% by using a disc pelletizer; the binder is any one of polyvinyl alcohol or polyacrylamide, and its addition amount It is 0.08% of the mass of rhenium-containing molybdenum concentrate; the oxidant is MnO 2 , its addition amount is 2.5% of the mass of the rhenium-containing molybdenum concentrate, and the main active ingredient of the rhenium-containing molybdenum concentrate is molybdenite MoS 2 , rhenium pyroxene ReS 2 ;

[0046] (2) Distribute the rhenium-molybdenum concentrate pellets on the grate bed of the grate machine with a cloth thickness of 80mm, and then let the rhenium-molybdenum concentrate pellets enter th...

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Abstract

The invention discloses a method for separating molybdenum and rhenium from rhenium and molybdenum-containing concentrate. The method comprises the following steps: adding an adhesive, an oxidant and water in rhenium and molybdenum-containing concentrate to prepare rhenium and molybdenum-containing concentrate pellets with grain size of 3-6mm and moisture of 8-12%, and distributing the concentrate pellets on a chain grate bed of a chain grate machine to carry out drying, oxidizing roasting and cooling, so that molybdenite in the pellets is oxidized into MoO3, and the rhenite is oxidized into Re2O7, which are volatilized to enter smoke and then are recovered by drip washing with water; in above process, the method of oxidizing roasting at two sections is adopted, the oxidizing efficiency of the molybdenite and the rhenite in the concentrate pellets are improved through different air roasting temperatures and air speeds, the Re2O7 concentration in the smoke is improved by circulating roasting smoke in a roasting chamber II to a roasting chamber I, and the smoke is maintained at 300-400 DEG C to effectively inhibit Re2O7 from being reduced by the SO2 so as to increase the recovery rate of the Re2O7; by adopting the roasting method disclosed by the invention, the volatilization rate of rhenium in the roasting process can be not less than 80%, the content of soluble molybdenum in roasted molybdenum is not less than 90%, the molybdenum and the rhenium are efficiently oxidized and separated.

Description

technical field [0001] The invention belongs to the molybdenum metallurgy industry in the field of nonferrous metallurgy, in particular to a method for separating molybdenum and rhenium from rhenium-containing molybdenum concentrate. Background technique [0002] Rhenium is a rare refractory metal. In recent years, the application of its super heat-resistant alloy in the aviation and aerospace industries has been increasing, and the demand has become more and more urgent. So far only rhenium pyroxene (ReS 2 ) and copper rhenium sulfide (CuReS 4 ) Two independent rhenium minerals, rhenium is mostly associated with molybdenum, copper, zinc, lead and other minerals, and the valuable raw material for extracting rhenium is mainly molybdenite MoS 2 , which can be used to extract rhenium as rhenium pyroxene ReS 2 form exists. Since molybdenum and rhenium exist together in isotropic form, to purify and utilize rhenium, molybdenum and rhenium must be separated first. The current...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/244C22B1/02C22B34/34C22B61/00
Inventor 甘敏张麟王勇范晓慧姜涛邱冠周李伟程志华吕重安曾祥龙汤雁斌刘朝辉李晓林邓琼陈许玲
Owner DAYE NONFERROUS METALS