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Control method for crystallizing process of producing small-size ammonium paratungstate crystals

A technology of ammonium paratungstate and a control method is applied in the control field of the crystallization process of producing ammonium paratungstate crystals with small particle size, and achieves the effects of obvious effects, increasing the number of crystal nuclei precipitated, and shortening the crystal growth time.

Active Publication Date: 2017-10-27
江西省修水赣北钨业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the development of existing crystallization technology is more focused on the reduction of energy consumption in the crystallization process, the automatic control of the process, and the influence of the speed of stirring speed on the crystals, and little attention is paid to the solution after changing the stirring speed in different periods during the entire crystallization process. Changes in properties of crystals precipitated in the crystallizer

Method used

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  • Control method for crystallizing process of producing small-size ammonium paratungstate crystals
  • Control method for crystallizing process of producing small-size ammonium paratungstate crystals
  • Control method for crystallizing process of producing small-size ammonium paratungstate crystals

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Experimental program
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Effect test

Embodiment 1

[0037] Will be 8m 3 Add 10m of ammonium tungstate solution 3 In the crystallizer, evaporative crystallization is carried out according to the following stepwise evaporation and crystallization step one, and the specific steps of the stepwise evaporation and crystallization step one are:

[0038] a. Heat the ammonium tungstate solution to 60°C;

[0039] b. Control the temperature at 60℃, set the stirring speed to 45r / min, and keep it for 1.5 hours;

[0040] c. Control the temperature at 65℃, set the stirring speed to 45r / min, and keep it for 1.5 hours;

[0041] d. Control the temperature at 70℃, set the stirring speed to 45r / min, and keep it for 1.5 hours;

[0042] e. Control the temperature at 60°C, set the stirring speed to 45r / min, and keep it for 1.5 hours.

[0043] Take the evaporated crystal and dry it to obtain ammonium paratungstate crystal 1.

Embodiment 2

[0045] Will be 8m 3 Add 10m of ammonium tungstate solution 3 In the crystallizer, evaporative crystallization is carried out according to the following stepwise evaporation and crystallization step two, the specific steps of the stepwise evaporation and crystallization step two are:

[0046] a. Heat the ammonium tungstate solution to 60°C;

[0047] b. Control the temperature at 60℃, set the stirring speed to 15r / min, and keep it for 1.5 hours;

[0048] c. Keep the temperature at 65℃, set the stirring speed to 25r / min, and keep it for 1.5 hours;

[0049] d. Control the temperature at 72℃, set the stirring speed to 35r / min, and keep it for 1.5 hours;

[0050] e. Control the temperature at 62°C, set the stirring speed to 45r / min, and keep it for 1.5 hours.

[0051] Take the evaporated crystal and dry it to obtain ammonium paratungstate crystal 2.

Embodiment 3

[0053] Will be 8m 3 Add 10m of ammonium tungstate solution 3 In the crystallizer, evaporative crystallization is performed according to the following step three of stepwise evaporation and crystallization, and the specific steps of step three are:

[0054] a. Heat the ammonium tungstate solution to 60°C;

[0055] b. Control the temperature at 60℃, set the stirring speed to 45r / min, and keep it for 0.8 hours;

[0056] c. Control the temperature at 62℃, set the stirring speed to 40r / min, and keep it for 0.6 hours;

[0057] d. Control the temperature at 65°C, set the stirring speed to 35r / min, and keep it for 1.3 hours;

[0058] e. Control the temperature at 68°C, set the stirring speed to 30r / min, and keep it for 1 hour;

[0059] f. Control the temperature at 72℃, set the stirring speed to 25r / min, and keep it for 0.7 hours;

[0060] g. Control the temperature at 64℃, set the stirring speed to 20r / min, and keep it for 0.5 hours;

[0061] h. Control the temperature at 62°C, set the stirring s...

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Abstract

The invention discloses a control method for a crystallizing process of producing small-size ammonium paratungstate crystals. The control method is characterized by adding an ammonium paratungstate solution into a crystallizer for carrying out fractional evaporative crystallization; the fractional evaporative crystallization comprises the specific steps in the description; through steps a to h, the fractional evaporative crystallization of producing the small-size ammonium paratungstate crystals is completed by combining four stages of preliminary concentration, crystal nucleus separation, crystal growth and crystal aging during a solution crystallization process and seven time segments in steps b to h. The control method disclosed by the invention is simple and practical, and meanwhile, the effect is obvious; crystal growth is accurately affected just by controlling stirring time, the stirring speed and the stirring temperature, so that the purpose of controlling final crystal performance is achieved, production of the small-size ammonium paratungstate crystals is realized, and produced small-size ammonium paratungstate crystals are good in consistency.

Description

Technical field [0001] The invention belongs to the field of tungsten smelting and processing, and specifically relates to a method for controlling the crystallization process of producing small-diameter ammonium paratungstate crystals. Background technique [0002] Tungsten is a metal element with an atomic number of 74 and an atomic weight of 183.84. Elemental tungsten is steel gray or silver-white, with high hardness and high melting point, and is not corroded by air at room temperature; its main purpose is to manufacture filaments, high-speed cutting alloy steels and super-hard molds, as well as optical instruments and chemical instruments. [0003] Tungsten is a non-ferrous metal and an important strategic metal. Tungsten ore was called "heavy stone" in ancient times. In 1781, the Swedish chemist Karl Wilhelm Scheler discovered scheelite and extracted a new element acid-tungstic acid. In 1783, it was discovered by the Spanish De Purya that wolframite also extracted tungstic a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G41/00B01D9/02B01D1/26B01D1/00
CPCB01D1/0082B01D1/26B01D9/0018B01D9/0031B01D2009/0086C01G41/00
Inventor 李军丁伟邱友红夏瑜夏金龙
Owner 江西省修水赣北钨业有限公司