Method for selecting calcium tungsten

Method for selecting calcium tungsten

Calcium tungsten is a common metal material widely used in aviation, aerospace, electronics, chemical and other fields. However, due to the special properties of calcium tungsten, its preparation process is relatively difficult and requires some special methods. This article will introduce several methods for selecting calcium tungsten to help readers better understand the preparation process of calcium tungsten.

1、 Electrochemical method

Electrochemical method is a common method for selecting calcium tungsten. This method is mainly to separate calcium and tungsten on the electrode by electrolysis of calcium Tungstate or Tungstate solution. This method has the advantages of simple operation, high efficiency, and large output, so it has been widely used in industrial production.

The specific operation steps for are as follows:

1. Preparation of electrolyte: Dissolve calcium Tungstate or Tungstate in appropriate amount of water to obtain electrolyte.

2. Preparation of electrodes: Pour the electrolyte into the electrolytic cell, and insert the anode and cathode into the electrolytic cell separately.

3. Start electrolysis: After being energized, the oxygen on the anode will react with calcium tungstate ions or tungstate ions to generate oxygen and water, while the calcium tungsten on the cathode will precipitate.

4. Collection of calcium and tungsten: Collect the precipitated calcium and tungsten, and after subsequent treatment, obtain pure calcium and tungsten.

2、 Thermal reduction method

The thermal reduction method is another common method for selecting calcium tungsten. This method mainly involves reducing calcium tungstate or ammonium tungstate at high temperature to precipitate calcium tungsten in the reduction reaction. This method has the advantages of simple operation, easy availability of raw materials, and low cost, so it has been widely used in small-scale production.

The specific operation steps are as follows:

1. Preparation of raw materials: Add calcium tungstate or ammonium tungstate to the reducing agent and mix evenly.

2. Conduct reduction reaction: Heat the mixture to high temperature to cause a reduction reaction of calcium tungstate or ammonium tungstate, and calcium and tungsten precipitate during the reaction.

3. Collection of calcium and tungsten: Collect the precipitated calcium and tungsten, and after subsequent treatment, obtain pure calcium and tungsten.

3、 Hydrogen reduction method

The hydrogen reduction method is a relatively complex method for selecting calcium tungsten. This method mainly uses hydrogen gas to reduce calcium tungstate or ammonium tungstate, causing calcium tungsten to precipitate during the reduction reaction. This method has the advantages of low reaction temperature and high product purity, so it has been widely used in the preparation of high-purity calcium tungsten.

The specific operation steps are as follows:

1. Preparation of raw materials: Add calcium tungstate or ammonium tungstate to the reactor and add an appropriate amount of hydrogen gas.

2. Conduct reduction reaction: Heat the reactor to an appropriate temperature to cause a reduction reaction of calcium tungstate or ammonium tungstate, and calcium and tungsten precipitate during the reaction.

3. Collection of calcium and tungsten: Collect the precipitated calcium and tungsten, and after subsequent treatment, obtain pure calcium and tungsten.

The above are several common methods for selecting calcium tungsten, each of which has its own applicable occasions and characteristics. In actual production, it is necessary to choose appropriate methods based on different needs to achieve the best production effect.

Method for selecting calcium tungsten