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A method for selectively leaching rhenium from molybdenum concentrate roasting soot

A molybdenum concentrate and selective technology, applied in the field of comprehensive recovery and utilization of rare elements, can solve problems such as poor cost performance, large disturbance in the main process of molybdenum smelting, and doubts about the economics of industrial implementation.

Active Publication Date: 2022-04-05
ZHENGZHOU MINERALS COMPOSITIVE UTILIZATION RES INST CHINESE GEOLOGICAL ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this technical route is theoretically feasible, it is less cost-effective in practical engineering applications. The reason is that the production of existing molybdenum concentrates is oxidative roasting, and the molybdenum in the oxidative roasting soot also has the value of recovery, but To build a liquid recovery production line for the solution rich in molybdenum and rhenium, because it involves a new process route, the main process of molybdenum smelting is greatly disturbed, and many enterprises cannot accept it. The economics of its industrial implementation are doubtful. Therefore, at present, most The practice of most enterprises is still to return the oxidized roasting soot to the molybdenum concentrate roasting system to realize the recovery of molybdenum

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  • A method for selectively leaching rhenium from molybdenum concentrate roasting soot

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The method for selectively leaching rhenium from molybdenum concentrate roasting soot of the present invention, such as figure 1 shown, including the following steps:

[0032] 1) Take 1 kg of molybdenum concentrate roasting soot, put it in a tube furnace, and use an oil-free vacuum pump to pump air. When the pressure in the corundum tube reaches 30Pa, start to heat up to 400°C at a rate of 5°C / min, and maintain the temperature for 30 minutes. , then naturally cooled to room temperature, the cooling process pressure was controlled at 100Pa, and then the vent valve was opened to take out the roasted soot. Some samples were taken for analysis and testing, and the calculated S removal rate was 31.01%, the Re loss rate was 1.74%, and the Mo loss rate was 1.23%.

[0033] 2) Take deionized water, add the roasted soot obtained in step 1), keep the liquid-solid ratio at 5:1, and stir and leach for 240 minutes at room temperature. The pH of the system during the leaching process...

Embodiment 2

[0036] The method for selectively leaching rhenium from molybdenum concentrate roasting soot of the present invention comprises the following steps:

[0037] 1) Take 1kg of molybdenum concentrate roasting soot, put it in a tube furnace, and use an oil-free vacuum pump to pump air. When the pressure in the corundum tube reaches 80Pa, start to heat up to 200°C at a rate of 5°C / min, and maintain the temperature for 60min , then naturally cooled to room temperature, the cooling process pressure was controlled at 100Pa, and then the vent valve was opened to take out the roasted soot. Some samples were taken for analysis and testing, and the calculated S removal rate was 6.35%, the Re loss rate was 1.36%, and the Mo loss rate was 0.84%.

[0038] 2) Take deionized water, adjust the pH value to 3 with hydrochloric acid, add step 1) to obtain roasted soot, keep the liquid-solid ratio at 4:1, stir and leaching at room temperature for 240min, the pH of the leaching process system is betw...

experiment example 3

[0041] The method for selectively leaching rhenium from molybdenum concentrate roasting soot of the present invention comprises the following steps:

[0042] 1) Take 1kg of molybdenum concentrate roasting soot, put it in a tube furnace, and use an oil-free vacuum pump to pump air. When the pressure in the corundum tube reaches 50Pa, start to heat up to 600°C at a rate of 5°C / min, and maintain the temperature for 90min , then naturally cooled to room temperature, the cooling process pressure was controlled at 100Pa, and then the vent valve was opened to take out the roasted soot. Some samples were taken for analysis and testing, and the calculated S removal rate was 46.35%, the Re loss rate was 4.07%, and the Mo loss rate was 3.54%.

[0043] 2) Take deionized water, adjust the pH value to 5 with nitric acid, add the above-mentioned roasted soot, keep the liquid-solid ratio at 6:1, stir and leach at room temperature for 240 minutes, and keep the pH of the system between 3-4 duri...

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Abstract

The invention belongs to the technical field of comprehensive recovery and utilization of rare elements, and in particular relates to a method for selectively leaching rhenium from molybdenum concentrate roasting soot. The method comprises the following steps: 1) roasting molybdenum concentrate roasting soot at a low temperature of 200-600° C. to remove sulfur oxides adsorbed in the molybdenum concentrate roasting soot; 2) adding the obtained product in step 1) to water or an acidic solution Roasted molybdenum concentrate roasted soot is leached by adding an oxidizing agent, the pH of the leaching process control system is 1.5-5, and the solid and liquid are separated to obtain a rhenium-rich leaching solution and leaching slag; the acidic solution and oxidizing agent do not contain sulfur. The invention pre-removes the acid gas in the soot by low-temperature roasting, realizes the selective leaching of rhenium by controlling the pH condition, avoids a large amount of leaching of molybdenum, and finally realizes the technology that the leaching rate of rhenium is >60% and the leaching rate of molybdenum is lower than 2%. index.

Description

technical field [0001] The invention belongs to the technical field of comprehensive recovery and utilization of rare elements, and in particular relates to a method for selectively leaching rhenium from molybdenum concentrate roasting soot. Background technique [0002] Rhenium is a rare element and one of the rarest elements in the earth's crust. Its main purpose is to prepare high-temperature alloys and petroleum hydrogenation catalysts. Rhenium plays an irreplaceable role in high-temperature nickel-based alloys for aeroengine turbofans and steam turbine blades. . Rhenium has no independent deposits, and is mainly associated with molybdenite or copper-molybdenum ore, and is often recovered as a by-product of molybdenum smelting and copper smelting. In the field of molybdenum smelting, the eluent and soot produced during the roasting process of molybdenum concentrate are the most important raw materials for recovering rhenium. At present, the technology of recovering rhe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/02C22B1/02C22B61/00C22B34/34
CPCC22B7/02C22B7/007C22B1/02C22B61/00C22B34/34Y02P10/20
Inventor 刘红召张博王威柳林曹耀华王洪亮
Owner ZHENGZHOU MINERALS COMPOSITIVE UTILIZATION RES INST CHINESE GEOLOGICAL ACAD