Method for co-producing ammonium molybdate and sulfuric acid through treating molybdenite by oxygen-pressure water soaking process

A technology for molybdenite and ammonium molybdate is applied in the field of oxygen pressure water leaching treatment of molybdenite to co-produce ammonium molybdate and sulfuric acid, which can solve the problems of high cost of valuable components and consumption of sodium hydrosulfide, and achieve a simple process. , Improve production efficiency, good selectivity

Active Publication Date: 2017-03-08
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] CN101775491A discloses an electrolysis method using NaCl as a medium. Although the reaction temperature of this electrochemical leaching method is room temperature, and the reaction medium is cheap and easy to obtain, the current efficiency can only be around 60%.
Because the acidity in the liquid phase after water immersion is relatively strong, using sodium hydrosulfide to adjust the pH, the method of removing impurities will consume a large amount of sodium hydrosulfide, and at the same time cause the sulfuric acid generated by water immersion to be neutralized into by-product sodium sulfate, resulting in the recovery of liquid The cost of valuable components in the phase is too high

Method used

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  • Method for co-producing ammonium molybdate and sulfuric acid through treating molybdenite by oxygen-pressure water soaking process
  • Method for co-producing ammonium molybdate and sulfuric acid through treating molybdenite by oxygen-pressure water soaking process
  • Method for co-producing ammonium molybdate and sulfuric acid through treating molybdenite by oxygen-pressure water soaking process

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Experimental program
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Effect test

Embodiment 1

[0065] In the present embodiment, the molybdenite is prepared and processed to co-produce ammonium molybdate and sulfuric acid by the following method, which specifically includes the following steps (the schematic flow chart is as follows: figure 1 shown):

[0066] (1) Mix molybdenite powder containing 45% molybdenum less than 250 meshes with water evenly at a solid-to-liquid ratio of 1:2 (g:mL) to make molybdenite slurry;

[0067] (2) inject the molybdenite slurry into the pressure reactor, and carry out the oxygen pressure water immersion reaction with the oxidizing gas with a partial pressure of 1MPa at a temperature of 200°C for 1.5h;

[0068] (3) filtering the slurry obtained in step (2) to obtain filter cake and filtrate;

[0069] (4) the filter cake that step (3) is obtained is obtained ammonium molybdate product through ammonia immersion, filtration, crystallization;

[0070] (5) The filtrate obtained in step (3) is subjected to molybdenum removal treatment, the fil...

Embodiment 2

[0075] In the present embodiment, the molybdenite is prepared and processed to co-produce ammonium molybdate and sulfuric acid by the following method, which specifically includes the following steps (the schematic flow chart is as follows: figure 1 shown):

[0076] (1) Mix molybdenite powder less than 250 meshes and containing 58% molybdenum with water evenly at a solid-to-liquid ratio of 1:7 (g:mL) to make molybdenite slurry;

[0077] (2) inject the molybdenite slurry into the pressure reactor, and carry out the oxygen pressure water immersion reaction with the oxidizing gas with a partial pressure of 1.5MPa at a temperature of 180°C for 4h;

[0078] (3) filtering the slurry obtained in step (2) to obtain filter cake and filtrate;

[0079] (4) the filter cake that step (3) obtains makes ammonium molybdate product through ammonia immersion, filtration, crystallization;

[0080] (5) The filtrate obtained in step (3) is subjected to molybdenum removal treatment, the filtrate ...

Embodiment 3

[0084] In the present embodiment, the molybdenite is prepared and processed to co-produce ammonium molybdate and sulfuric acid by the following method, which specifically includes the following steps (the schematic flow chart is as follows: figure 1 shown):

[0085] (1) Mix molybdenite powder less than 100 mesh and containing 47% molybdenum with water evenly at a solid-to-liquid ratio of 1:6 (g:mL) to make molybdenite slurry;

[0086] (2) inject the molybdenite slurry into the pressure reactor, and carry out oxygen pressure water immersion reaction with an oxidizing gas with a partial pressure of 0.5MPa at a temperature of 220°C for 2h;

[0087] (3) filtering the slurry obtained in the second step above to obtain filter cake and filtrate;

[0088] (4) filter cake after washing makes ammonium molybdate product through ammonia leaching, filtration, crystallization etc.;

[0089] (5) The filtrate obtained in the third step above is subjected to molybdenum removal treatment, the...

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Abstract

The invention provides a method for co-producing ammonium molybdate and sulfuric acid through treating molybdenite by an oxygen-pressure water soaking process. The method comprises the following steps: uniformly mixing molybdenite powder and water according to the solid-to-liquid ratio of (1: 2) to (1: 7), so as to prepare molybdenite slurry; injecting the molybdenite slurry into a pressure reactor, so as to subject the molybdenite slurry to an oxygen-pressure water soaking reaction with oxidizing gas; filtering the obtained slurry, so as to obtain a filter cake and filter liquor; subjecting the filter cake to ammonia leaching, filtering and crystallizing, so as to prepare the ammonium molybdate product; and subjecting the filter liquor to molybdenum removing treatment, thereby obtaining the sulfuric acid product. According to the method provided by the invention, the total recovery rate of molybdenum reaches 95% or more and even reaches up to 98% or more, meanwhile, the sulfuric acid with relatively high concentration can be obtained, and environmental pollution is not caused; and the method is simple, efficient and energy-saving and is an environment-friendly hydrometallurgical clean production process for co-producing ammonium molybdate and sulfuric acid through efficiently utilizing the molybdenite, thereby having a good industrialized application prospect.

Description

technical field [0001] The invention belongs to the field of molybdenum chemical industry and hydrometallurgy, and in particular relates to a method for treating molybdenite with oxygen pressure water leaching to co-produce ammonium molybdate and sulfuric acid. Background technique [0002] Molybdenite is the most widely used molybdenum ore in the molybdenum industry, and it is the main raw material for the production of ammonium molybdate and molybdenum oxide. At present, the application of molybdenite oxidation roasting-ammonia leaching process to produce ammonium molybdate is a mature and mainstream application process, but this process will produce a large amount of SO 2 Flue gas, SO produced due to the characteristics of the equipment and process itself 2 Most of the flue gas has a low concentration and cannot meet the requirements for the preparation of sulfuric acid. SO 2 The flue gas is exhausted and pollutes the environment. [0003] Wet treatment of molybdenite ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G39/00C01B17/74
CPCC01B17/74C01G39/00C01P2002/72C01P2004/03C01P2006/80
Inventor 徐红彬付云枫李晓艳肖清贵张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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