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Method for extracting tungsten trioxide and molybdenum trioxide by pretreating tungsten-molybdenum concentrates with concentrated acid

A technology of tungsten trioxide and molybdenum trioxide, applied in the direction of improving process efficiency, can solve the problems of failure to achieve the leaching purpose, large loss of tungsten and molybdenum, low tungsten grade, etc., and achieves a short process, high recovery rate and simple process. Effect

Inactive Publication Date: 2010-09-08
范颖
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  • Abstract
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Problems solved by technology

In the process of treating oxidized ore with the method invented by Yang Huipeng et al., because this type of oxidized concentrate contacts strong acid or strong dilute acid, a large number of bubbles are generated, and the generation of such bubbles will take a large amount of leaching liquid out of the reactor. A normal operation will overflow one-third or one-half of the leaching solution, thus failing to achieve the purpose of leaching, and the loss of tungsten and molybdenum is too large
In the treatment method of tungsten and molybdenum concentrates described in the Handbook of Nonferrous Metal Extraction and Metallurgy, tungsten is mainly tungsten ore, and its molybdenum content is low; molybdenum is mainly molybdenite concentrate, and the tungsten grade is extremely low, so it is not suitable for processing this kind of oxidation. type concentrate

Method used

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  • Method for extracting tungsten trioxide and molybdenum trioxide by pretreating tungsten-molybdenum concentrates with concentrated acid

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Effect test

Embodiment 1

[0020] Embodiment 1: the present invention makes MoO 3 The technological process includes four steps of concentrated acid pretreatment, leaching, molybdenum precipitation, and roasting. The process is as follows:

[0021] A. Concentrated acid pretreatment: In an acid-resistant enamel kettle, put 100kg of tungsten-molybdenum ore powder containing 3.5% molybdenum and 3.5% tungsten trioxide, and add 1.5-3.5 times the theoretical amount of acid to completely react with the contained calcium molybdate. Concentrated acid (HCl or HNO 3 ) or mixed acid, stir evenly, and pretreat at room temperature for 0.5-2.5 hours.

[0022] B. Leaching: After the mineral powder is pretreated with concentrated acid, the solid-to-liquid ratio is controlled at 1:2, the pH value of the solution is 0.1-0.5, the reaction temperature is 15°C-95°C, and the reaction time is 0.5h-5.5h. After the reaction, the solid and liquid were separated, and the solid obtained was 36 kg of tungsten concentrate with impr...

Embodiment 2

[0026] Embodiment 2: This invention makes MoO 3 The process includes four steps of concentrated acid pretreatment, leaching, molybdenum precipitation, and roasting. The process is as follows:

[0027] A. Concentrated acid pretreatment: Put 100kg of tungsten-molybdenum ore powder containing 8% molybdenum and 8% tungsten trioxide into an acid-resistant enamel kettle, and add a little water to moisten the ore powder. Add concentrated acid (HCl or HNO) that is 1.5 to 2.5 times the theoretical amount of acid and calcium molybdate reaction 3 ) or mixed acid, stirred evenly, and pretreated at room temperature for 1.5h.

[0028] B. Leaching: After concentrated acid pretreatment, control the solid-to-liquid ratio of 1:3, adjust the pH value of the solution to 0.25, the reaction temperature is 50-85°C, and the reaction time is 4h. After the reaction, the solid and liquid were separated, and the solid obtained was 34 kg of tungsten concentrate with improved grade, the liquid contained ...

Embodiment 3

[0032] Embodiment 3: This invention makes MoO 3 The process mainly includes four steps of concentrated acid pretreatment, leaching, molybdenum precipitation and roasting. The process flow is as follows:

[0033] A. Concentrated acid and pretreatment: Put 100kg of tungsten-molybdenum ore powder containing 12% molybdenum and 12% tungsten trioxide into an acid-resistant enamel kettle, and add 2 to 4 times the theoretical amount of acid and calcium molybdate reaction while stirring. Concentrated acid (HCl or H 2 SO 4 ) or mixed acid, pretreatment for 1.5h after adding concentrated acid.

[0034] B. Leaching: After concentrated acid pretreatment, control the solid-to-liquid ratio of 1:3.5, adjust the pH of the solution to 0.1, the reaction temperature is 70°C, and the reaction time is 6h. Stirring, solid-liquid separation after leaching, the obtained solid is 33kg of tungsten concentrate with improved grade, the liquid contains 34.1g / L of molybdenum, and the molybdenum leaching ...

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Abstract

The invention relates to a method for extracting tungsten trioxide and molybdenum trioxide by pretreating tungsten-molybdenum concentrates with a concentrated acid, which comprises eight flows of pretreatment with the concentrated acid, lixiviation, molybdenum precipitation, the preparation of MoO3 by roasting, ammonia leaching, concentration, cooling for crystallization, and the preparation of WO3 by roasting. The flows have the advantages that: 1, the recovery rate is high, the process is simple, the flows are short, the total recovery rate of molybdenum is between 95 and 98.5 percent, and the total recovery rate of the WO3 is between 96 and 97.5 percent; and 2, the separation of tungsten and the molybdenum is realized, in the process flows, the solubility of the molybdenum and the tungsten in the acid is different, and thus, according to the principle, the tungsten content of the molybdenum trioxide is less than or equal to 0.4 percent, the molybdenum content of leaching residues (tungsten concentrates) is less than or equal to 0.3 percent, so that the separation of the tungsten and the molybdenum is realized. Tungsten-molybdenum concentrate resources are utilized fully, so the method has excellent social and economic benefits.

Description

technical field [0001] The invention belongs to non-ferrous metal hydrometallurgy technology, and specifically relates to a method for preparing tungsten trioxide and molybdenum trioxide from tungsten-molybdenum ore. Background technique [0002] There are more than 20 kinds of minerals in our country which have a dominant position in the world. Minerals with global advantages include rare earths, tungsten, tin, molybdenum, antimony and other minerals, which not only have considerable proven reserves, but also have high-quality resources and good conditions for development and utilization. They have obvious advantages and strong competitiveness in the international market. [0003] In recent years, the improvement and improvement of dressing and smelting technology have reached a certain level of enrichment of oxidized tungsten-molybdenum ore. For example, in Gansu, Qinghai, Xinjiang, Inner Mongolia and other provinces, the content of tungsten trioxide is 3-8%, and the conte...

Claims

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Application Information

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IPC IPC(8): C22B3/08C22B3/14C22B34/30
CPCY02P10/20
Inventor 范颖邹贵田
Owner 范颖
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