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A method of mechanically decomposing calcium-based raw materials to prepare soluble sodium salt

A mechanical force and soluble technology, applied in the field of basic chemistry, can solve problems such as complex process flow, equipment corrosion, environmental pollution, etc., and achieve the effect of simple reaction conditions, wide application range and simple process

Inactive Publication Date: 2017-09-29
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process is complex and costly. At the same time, equipment corrosion is severe under high temperature and high acidity conditions, and heat loss is large. Although the process has been continuously improved, the problem has not been fundamentally improved or solved. In the production operation and equipment There are still major safety hazards in maintenance; in addition, hydrogen fluoride is highly corrosive and highly toxic, and once it escapes, it will undoubtedly cause huge pollution to the environment

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  • A method of mechanically decomposing calcium-based raw materials to prepare soluble sodium salt
  • A method of mechanically decomposing calcium-based raw materials to prepare soluble sodium salt

Examples

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Effect test

Embodiment 1

[0039] A method for mechanically decomposing calcium-based raw materials (calcium tungstate) to prepare soluble sodium salt (sodium tungstate), comprising the steps of:

[0040] 1) By means of mechanical grinding, 1.3209g of calcium tungstate (CaWO 4 ), 0.4405g sodium hydroxide (NaOH) and 0.2386g aluminum hydroxide (Al(OH) 3 ) mixed, and put into a 50mL zirconia grinding pot, add 70g of zirconia balls with a diameter of 15mm, the ball-to-material ratio is 35, put it in the mill and set the speed to 600rpm, the grinding time is 120min, 240min respectively, and the grinding After the completion, the powder product can be obtained, and the decomposition process of calcium tungstate can be realized.

[0041] 2) Rinse the powder product obtained in step 1) with 400mL distilled water, perform magnetic stirring, and stir at a stirring speed of 500rpm at 25°C for 20min to fully dissolve the sodium tungstate; recover the supernatant to obtain the sodium tungstate solution, Sodium tun...

Embodiment 2

[0048] A method for mechanically decomposing calcium-based raw material (scheelite concentrate) to prepare soluble sodium salt (sodium tungstate), comprising the steps:

[0049] 1) Using mechanical grinding means, 1.3282g scheelite concentrate (CaWO 4 The content is 90.63%, containing a small amount of impurities such as hematite, quartz), 0.4683g sodium hydroxide (NaOH) and 0.2174g aluminum hydroxide (Al(OH) 3 ), and put into a 50mL steel grinding pot, add 98g of steel balls with a diameter of 15mm, the ball-to-material ratio is 49, place the rotating speed in the mill at 600rpm, and the grinding time is 240min. After the grinding is completed, a powder product is obtained, namely The decomposition process of calcium tungstate can be realized.

[0050] 2) Rinse the powder product obtained in step 1) with 400mL distilled water, perform magnetic stirring, and stir at a stirring speed of 500rpm at 25°C for 20min to fully dissolve the sodium tungstate; recover the supernatant to...

Embodiment 3

[0056] A method for mechanically decomposing calcium-based raw material (calcium fluoride) to prepare soluble sodium salt (sodium fluoride), comprising the steps of:

[0057] 1) By means of mechanical grinding, 0.625g of calcium fluoride (CaF 2 ), 0.959g sodium hydroxide (NaOH) and 0.416g aluminum hydroxide (Al(OH) 3 ) mixed, and put into a 50mL zirconia grinding pot, add 50g of zirconia balls with a diameter of 15mm, the ball-to-material ratio is 25, put the mill in the mill and set the speed to 800rpm, and the grinding time is 120min. After the grinding is completed, The powder product can realize the decomposition process of calcium fluoride.

[0058] 2) Rinse the powder product obtained in step 1) with 400 mL of distilled water, perform magnetic stirring, and stir at a stirring speed of 500 rpm at 25°C for 20 min to fully dissolve the sodium fluoride; recover the supernatant to obtain a sodium fluoride solution, After subsequent evaporation, crystallization, and drying (...

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Abstract

The invention discloses a method for preparing soluble sodium salt by decomposing calcium-based raw materials under mechanical force. The calcium-based raw materials, an alkaline source and an alkali-based calcium fixing agent are mixed by a mechanical force grinding means and then put in a grinding machine to be ground, the ball material ratio is controlled at 25-50, the grinding speed is 400-800 rpm, the grinding time is 60-240 min, and powdery products are obtained; then, the powdery products are placed in water to be sufficiently stirred and dissolved, a liquid supernatant is recovered, sodium salt solids are obtained through evaporation, crystallization and drying. According to the method, the recovery rate of useful elements is high, the process is simple, the reaction condition is mild, and the method is environment-friendly, can be applied to the fields of chemical engineering and wet metallurgy and is suitable for popularization and application.

Description

technical field [0001] The invention belongs to the field of basic chemistry, and in particular relates to a method for mechanically decomposing and decomposing calcium-based raw materials to prepare soluble sodium salts. Background technique [0002] The high strength and excellent heat resistance of tungsten make it widely used in industry, and its main sources are wolframite and scheelite; however, with wolframite ([Fe, Mn]WO 4 ), the gradual consumption of scheelite (CaWO 4 ) has become the main source of tungsten at present. The metallurgical process of scheelite is divided into acid method and alkali method. At present, the most common process is the sodium hydroxide stirring method. This method is to control the temperature at about 200°C at a certain stirring speed, and realize the decomposition of calcium tungstate by adding a large excess of sodium hydroxide and controlling the low liquid-solid ratio. Although this method has achieved good industrial application...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D3/02
CPCC01D3/02C01P2002/72
Inventor 张其武陈敏李钊
Owner WUHAN UNIV OF TECH