Method for recovering metal elements from molybdenite

A metal element, molybdenite technology, applied in crucible furnaces, electric furnaces, rotary drum furnaces, etc., can solve the problems affecting molybdenum oxidation, wrapping, and cumbersome recycling processes, and achieve the effect of avoiding the discharge of ammonia nitrogen wastewater and good applicability

Active Publication Date: 2022-07-01
ZHENGZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, in the process of decomposing molybdenite by traditional pressure cooking, most of the molybdenum forms molybdenite precipitates, and the molybdenum acid is a viscous solid, covering the surface of molybdenite ore, which will cause encapsulation of unreacted molybdenite ore. This further affects the oxidation of molybdenum, and the obtained molybdenum acid precipitation also requires the dissolution process of ammonia water or sodium hydroxide. At the same time, a small part of molybdenum remains in the leaching solution, and special molybdenum recovery equipment is required, resulting in very cumbersome subsequent recovery processes.

Method used

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  • Method for recovering metal elements from molybdenite

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Embodiment 1

[0080] A specific embodiment of the present invention discloses a method for recovering metal elements and copper from molybdenite.

[0081] The main components of molybdenite raw materials are calculated in mass percentage: molybdenum 46.1%, copper 1.2%, bismuth 2.42%.

[0082] Step 1. Oxidative roasting of molybdenite to obtain molybdenum calcine.

[0083] Step 2. Take phosphoric acid as leaching aid, the sulfuric acid of 100g / L is leaching agent, the consumption of leaching aid is 0.8 times of molybdenite quality, and the liquid-solid ratio of leaching is 13L / kg, and the temperature is under the condition of 100 ℃ , leaching for 5 hours.

[0084] Step 3. After the leaching is completed, cool to room temperature and filter to obtain a filter residue containing 15.1% of bismuth and a filtrate containing molybdenum and copper.

[0085] Among them, the leaching rate of molybdenum is as high as 98.1%, and the leaching rate of copper is as high as 95.2%.

[0086] Step 4. For t...

Embodiment 2

[0092] A specific embodiment of the present invention discloses a method for recovering metal elements and copper from molybdenite.

[0093] The main components of molybdenite raw materials are calculated in mass percentage: molybdenum 50.2%, copper 1.2%, bismuth 2.42%.

[0094] Step 1. Oxidative roasting of molybdenite to obtain molybdenum calcine.

[0095] Step 2. Take calcium phosphate as leaching aid, the sulfuric acid of 50g / L is leaching agent, the consumption of leaching aid is 0.5 times of molybdenite quality, and the liquid-solid ratio of leaching is 8L / kg, and the temperature is the condition of 90 ℃ leaching for 3 hours.

[0096] Step 3. After the leaching is completed, cool to room temperature and filter to obtain a filter residue containing 16% bismuth and a filtrate containing molybdenum and copper.

[0097] Among them, the leaching rate of molybdenum is as high as 98.5%, and the leaching rate of copper is as high as 95%.

[0098] Step 4. For the filtrate cont...

Embodiment 3

[0104] A specific embodiment of the present invention discloses a method for recovering metal elements and copper from molybdenite.

[0105] The main components of molybdenite raw materials are calculated in mass percentage: molybdenum 48.2%, copper 1.2%, bismuth 2.42%.

[0106] Step 1. Oxidative roasting of molybdenite to obtain molybdenum calcine.

[0107] Step 2. Take phosphoric acid as leaching aid, the sulfuric acid of 200g / L is leaching agent, the consumption of leaching aid is 1.2 times of molybdenite quality, and the liquid-solid ratio of leaching is 10L / kg, and the temperature is under the condition of 80 ℃ , leaching for 2 hours.

[0108] Step 3. After the leaching is completed, cool to room temperature and filter to obtain a filter residue containing 16% bismuth and a filtrate containing molybdenum and copper.

[0109] Among them, the leaching rate of molybdenum is as high as 97.5%, and the leaching rate of copper is as high as 95%.

[0110] Step 4. For the filtr...

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Abstract

The invention relates to a method for recovering metal elements from molybdenite, belongs to the technical field of metal smelting, and solves the problems that in the prior art, ammonia water or sodium hydroxide is used in the molybdenum recovery process, and a large amount of ammonia-nitrogen wastewater is generated; the calcification method is used for roasting to obtain calcified molybdenum calcine, and the intermediate product molybdenum calcine widely generated in molybdenum ore smelting cannot be utilized in the method; and valuable metals in molybdenite are difficult to recover, and the process is tedious. The method for recovering the metal elements from the molybdenite provided by the invention comprises the following steps: roasting the molybdenite to obtain molybdenum calcine; the molybdenite is leached by using a leaching agent under the condition of an auxiliary leaching agent to obtain a leaching solution; the leaching agent is sulfuric acid, and the leaching aid is one or a combination of phosphoric acid and calcium phosphate; filtering to obtain filtrate and bismuth-enriched filter residues; extracting molybdenum from the filtrate to obtain raffinate and molybdenum-containing extract liquor; and back-extracting the molybdenum by using a back-extracting agent to obtain a back-extracting solution containing the molybdenum. And efficient recycling of multiple metal elements in molybdenite is achieved.

Description

technical field [0001] The invention relates to the technical field of metal smelting, in particular to a method for recovering metal elements from molybdenite. Background technique [0002] Molybdenite is a typical sulfide ore, in which many valuable metals such as copper, bismuth, lead, and rhenium are associated. However, the current molybdenite smelting process in the prior art mostly adopts the oxidative roasting-ammonia leaching process, and a large amount of sulfur dioxide flue gas is generated during the oxidative roasting process, and the sulfur element in the molybdenite cannot be effectively recycled. Molybdenite calcine is obtained after molybdenite roasting. Molybdenum calcine is insoluble in strong acid. The reaction between molybdenum calcine and strong acid will generate molybdic acid. resulting in no further dissolution. [0003] In view of the above reasons, technicians began to seek methods for directly treating molybdenite, namely atmospheric decomposit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/34C22B1/02C22B3/08C22B3/38C22B15/00C22B30/06
CPCC22B34/34C22B1/02C22B3/08C22B30/06C22B15/0071Y02P10/20
Inventor 赵中伟李永立
Owner ZHENGZHOU UNIV
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