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A kind of one-step alkali leaching method of molybdenum calcined sand

A technology of alkali leaching and molybdenum calcination, which is applied in the field of non-ferrous metal smelting, can solve the problems of lengthy process and low comprehensive recovery rate of molybdenum, and achieve the effects of efficient leaching, shortening the smelting process and reducing processing costs

Active Publication Date: 2020-02-18
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the lengthy traditional metallurgical process of molybdenum, the comprehensive recovery rate of molybdenum becomes low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Using industrial molybdenum calcine as raw material, the molybdenum content is 45.6%, of which low-priced molybdenum oxide (MoO 2 ) is 5% of the total molybdenum. First, take by weighing molybdenum calcined sand 500g, and add 1000mL water to adjust slurry; Then add bleaching powder (available chlorine content is 35%) 48.3g, and place 3h at normal temperature, allow the low-valent molybdenum incomplete oxidation wherein to be fully oxidized ( without filtering).

[0025] (2) Carry out ammonia leaching to the fully oxidized molybdenum calcined slurry obtained in step (1), the amount of ammonia water with a mass fraction of 24% is about 504mL, the leaching temperature is 75°C, and the leaching time is 5h.

[0026] (3) Add ammonium phosphate compound to the solution after the reaction in step 2), continue leaching for 2 hours and then filter, the free phosphate concentration in the filtrate is 20g / L.

[0027] After detection and analysis, the leaching rate of molybden...

Embodiment 2

[0029] (1) Using industrial molybdenum calcine as raw material, the molybdenum content is 45.6%, of which low-priced molybdenum oxide (MoO 2 ) is 5% of the total molybdenum. First, weigh 1000g of molybdenum calcined sand and add 3000mL of water to adjust the slurry; then add 242.6g of bleaching powder (available chlorine content is 35%) and place it at room temperature for 2 hours to fully oxidize the incompletely oxidized low-valent molybdenum.

[0030] (2) The fully oxidized molybdenum calcined sand was leached with sodium hydroxide, the amount of sodium hydroxide was 456g, the leaching temperature was 85°C, and the leaching time was 2h.

[0031] (3) Add a small amount of sodium phosphate to the solution after the reaction in step 2), continue leaching for 1 hour and filter, the free phosphate concentration in the filtrate is 10g / L.

[0032] After detection and analysis, the leaching rate of molybdenum is 99.2%.

Embodiment 3

[0034] (1) Using industrial molybdenum calcine as raw material, the molybdenum content is 45.6%, of which low-priced molybdenum oxide (MoO 2 ) is 5% of the total molybdenum. First, weigh 1500g of molybdenum calcined sand, and add 7500mL of water to adjust the slurry; then add 261g of bleaching powder (with an available chlorine content of 35%), and place it at room temperature for 2 hours to fully oxidize the incompletely oxidized low-valent molybdenum.

[0035] (2) The fully oxidized molybdenum calcined sand was leached with sodium hydroxide, the amount of sodium hydroxide was 798g, the leaching temperature was 98°C, and the leaching time was 3h.

[0036] (3) Add a small amount of phosphoric acid to the solution after the reaction in step 2), continue leaching for 1.5h and then filter. The free phosphate concentration in the filtrate is 15g / L.

[0037] After detection and analysis, the leaching rate of molybdenum is 99.3%.

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Abstract

The invention provides a one-step commercial molybdenum oxide leaching method. The method comprises an operation of adding an oxidizing agent, an alkaline leaching agent and a phosphoric acid compoundinto ore pulp with commercial molybdenum oxides in steps under constant pressure so as to realize efficient leaching of commercial molybdenum oxides, wherein the oxidizing agent is sodium hypochlorite or bleaching powder, alkaline is sodium hydroxide or ammonium hydroxide, and the phosphoric acid compound is phosphoric acid, sodium phosphate or ammonium phosphate. According to the one-step alkaline leaching method, the oxidizing agent, the alkaline leaching agent and the phosphoric acid compound are added in steps, so that the original low-price molybdenum which is difficult to leached by alkaline is oxidized into high-price molybdenum which is easy to leach, and adverse effects, on commercial molybdenum oxide leaching, of transition metal impurities are counteracted at the same time, thereby realizing one-step efficient leaching of the molybdenum. Compared with the prior art, the method has the advantages that the smelting procedure is greatly shortened, the processing cost is reduced and the once leaching rate of the molybdenum is above 98%.

Description

technical field [0001] The invention relates to the technical field of nonferrous metal smelting, in particular to a one-step alkali leaching method for molybdenum calcined sand. Background technique [0002] The main chemical composition of molybdenite is MoS 2 Sulfide minerals, in which the sulfides include hexagonal and trigonal crystal structures. Molybdenite is the main mineral raw material for extracting molybdenum and rhenium. For the smelting of molybdenite, the oxidation roasting-ammonia leaching process is widely used at home and abroad. Molybdenum calcined sand is obtained from the oxidation roasting of molybdenite. Its main component is molybdenum trioxide, in addition to some calcium molybdate, Copper molybdate, iron molybdate, and molybdenum dioxide due to incomplete oxidation. [0003] In the oxidation roasting-ammonia leaching process, the stable molybdenum disulfide in molybdenite is first oxidized to soluble molybdenum trioxide through oxidation roasting...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B34/34
CPCC22B34/34
Inventor 李永立赵中伟王德志刘旭恒陈星宇李江涛何利华
Owner CENT SOUTH UNIV
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