Method of producing tungstic acid by closed type hydrochloric acid decompose tunstite

A scheelite and closed technology, which is applied in the field of tungstic acid production, can solve the problems of high consumption of raw and auxiliary materials, large environmental pollution, and low productivity, and achieve the effects of high quality, good water permeability, and improved efficiency

Inactive Publication Date: 2003-04-30
ZIGONG CEMENTED CARBIDE CORP
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  • Summary
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Problems solved by technology

Therefore, there are disadvantages such as large consumption of raw and auxiliary materials, high energy consumption, large environmental pollution, and low productivity in this method.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] In this embodiment, the volume is 3m 3 The anti-corrosion pressure reactor lined with EPDM rubber and equipped with agitator and steam injection pipe is used as the decomposition reaction device. Its production method is:

[0014] A. Material preparation: firstly, the WO 3 550kg of 65% raw scheelite concentrate powder is placed in a ball mill and ground into a fine powder with a particle size of 55 μm to 45 μm for use; 800 L (liter) of industrial hydrochloric acid with a concentration of 31% is used for use;

[0015] B. Decomposition treatment: Add the above-mentioned hydrochloric acid to the reaction kettle, heat it to 55°C in a closed manner, start the agitator and add 550kg of concentrate powder to be used, and decompose and react at 120°C and a pressure of 0.2Mpa for 70 minutes;

[0016] C. Washing and filtering: the feed liquid after the above-mentioned decomposition treatment is decompressed and discharged into a square vacuum filter, filtered and washed with ho...

Embodiment 2

[0019] In this embodiment, the volume is 5m 3 , The reaction kettle lined with polytetrafluoroethylene is used as the decomposition reaction device, and the WO 3 68% artificial scheelite pulp is used as raw material, and the pulp density is 2.1. Its production method is:

[0020] A. Raw material preparation: First, 2400L (liter) of industrial hydrochloric acid with a concentration of 31% is measured for use, and at the same time, 1.8m of the above-mentioned ore pulp is 3 warm up;

[0021] B. Decomposition treatment: add the above-mentioned hydrochloric acid and the preheated pulp into the reaction kettle at the same time, and decompose and react in a closed manner at 120°C and a pressure of 0.2Mpa for 80 minutes;

[0022] C. Washing and filtering: use 90°C hot water to filter and wash for 85 minutes, and the rest of the process and parameters are the same as in Example 1.

[0023] The decomposition rate of this embodiment reaches 99.73%, and the product has uniform particl...

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Abstract

A process for preparing tungstic acid from scheelite by decomposing it by hydrochloric acid in sealed condition includes such steps as adding hydrochloric acid and powered scheelite to reactor, sealing, thermal decomposing reaction while stirring, filter and washing to obtain H2WO4. Its advantages are high productivity, less consumption of hydrochloric acid and energy, and less environmental pollution.

Description

technical field [0001] The invention belongs to a method for producing tungstic acid in tungsten hydrometallurgy, in particular to a method for producing tungstic acid directly from scheelite or artificial scheelite (CaWO 4 ) by decomposing hydrochloric acid to prepare tungstic acid. The tungstic acid prepared by this method can be used in the production of subsequent deep-processing products with tungsten as the main component. Background technique [0002] In the process of tungsten hydrometallurgy, due to the depletion of wolframite resources, tungsten hydrometallurgy will also turn to scheelite and artificial scheelite as the main raw materials. The production of tungstic acid by using scheelite (powder) and artificial scheelite slurry is one of the key processes, and it is also an important process for subsequent deep-processing products with tungsten as the main component. The traditional method of producing tungstic acid from scheelite is to directly add excess hydr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/08
CPCY02P10/20
Inventor 苏连发孙林基张正枢
Owner ZIGONG CEMENTED CARBIDE CORP
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