Temperature control stepwise conversion method of producing electronic grade aluminum metaphosphate

An aluminum metaphosphate, electronic-grade technology, applied in the field of temperature-controlled step-by-step conversion, can solve the problems of difficult to achieve mass production, error-prone, cumbersome operation steps, etc., achieve high operational stability and safety, and simple and clear operation steps , the effect of high purity

Active Publication Date: 2012-04-11
SICHUAN MINGJING PHOTOELECTRIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the deficiencies of the existing methods for producing aluminum metaphosphate, provide a novel temperature-controlled step-by-step conversion method for the production of electronic-grade aluminum metaphosphate, overcome the cumbersom

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] [Example 1] A temperature-controlled step-by-step conversion method for producing electronic-grade aluminum metaphosphate, which comprises the following steps:

[0018] (1) Add water and phosphoric acid in a weight ratio of 1:1 to the reactor;

[0019] (2) After the reaction is complete, slowly add aluminum hydroxide to the reaction kettle, the weight ratio of the amount of aluminum hydroxide added to the phosphoric acid added in step (1) is 1:2;

[0020] (3) After the reaction is complete, aluminum dihydrogen phosphate is generated, put the generated aluminum dihydrogen phosphate into a box, put it in a heating furnace, and close the heating furnace;

[0021] (4) Raise the temperature of the heating furnace to 80°C, and extract air from the heating furnace, so that the heating furnace is in a negative pressure state, and the air pressure is less than 1mmHg;

[0022] (5) Raise the heating furnace to 280°C and keep it roasting at a constant temperature for 2.5 hours;

...

Embodiment 2

[0026] [Example 2] A temperature-controlled step-by-step conversion method for producing electronic-grade aluminum metaphosphate, which comprises the following steps:

[0027] (1) Add water and phosphoric acid in a weight ratio of 1:1 to the reactor;

[0028] (2) After the reaction is complete, slowly add aluminum hydroxide to the reaction kettle, the weight ratio of the amount of aluminum hydroxide added to the phosphoric acid added in step (1) is 1:2;

[0029] (3) After the reaction is complete, aluminum dihydrogen phosphate is generated, put the generated aluminum dihydrogen phosphate into a box, put it in a heating furnace, and close the heating furnace;

[0030] (4) Raise the temperature of the heating furnace to 120°C, and extract air from the heating furnace, so that the heating furnace is in a negative pressure state, and the air pressure is less than 1mmHg;

[0031] (5) Raise the temperature of the heating furnace to 320°C and keep it roasting at a constant temperatu...

Embodiment 3

[0035] [Example 3] A temperature-controlled step-by-step conversion method for producing electronic-grade aluminum metaphosphate, which comprises the following steps:

[0036] (1) Add water and phosphoric acid in a weight ratio of 1:1 to the reactor;

[0037] (2) After the reaction is complete, slowly add aluminum hydroxide to the reaction kettle, the weight ratio of the amount of aluminum hydroxide added to the phosphoric acid added in step (1) is 1:2;

[0038] (3) After the reaction is complete, aluminum dihydrogen phosphate is generated, put the generated aluminum dihydrogen phosphate into a box, put it in a heating furnace, and close the heating furnace;

[0039] (4) Raise the temperature of the heating furnace to 100°C, and extract air from the heating furnace, so that the heating furnace is in a negative pressure state, and the air pressure is less than 1mmHg;

[0040] (5) Raise the heating furnace to 300°C and keep it roasting at a constant temperature for 3 hours;

...

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Abstract

The invention discloses a temperature control stepwise conversion method of producing electronic grade aluminum metaphosphate, which comprises the following steps of: adding water and phosphoric acid in the weight ratio of 1 : 1 to a reaction kettle; slowly adding aluminum hydroxide after reacting completely,, and controlling the weight ratio of the added aluminum oxide to the phosphoric acid to 1 : 2; placing the produced aluminum dihydrogen phosphate in a box, and placing in a heating furnace, then closing the heating furnace; increasing temperature of the heating furnace, and extracting air to result in negative pressure state in the heating furnace; and carrying out temperature control baking to the heating furnace by three steps to obtain high-purity aluminum metaphosphate, taking out and cooling at room temperature. Using the method of carrying out stepwise conversion to the aluminum dihydrogen phosphate by controlling different temperatures to obtain the high-purity electronic grade aluminum metaphosphate, the characteristics of simple and clear operation steps, high stability and safety of industrial flow operation, high purity of produced aluminum metaphosphate, low production cost and batch production and the like can be realized.

Description

technical field [0001] The invention relates to a temperature-controlled step-by-step conversion method for producing electronic-grade aluminum metaphosphate. Background technique [0002] Aluminum metaphosphate is widely used in industry, mainly used as special optical glass, phosphate glass, fluorophosphate glass and laser nuclear fusion glass additive, etc. Aluminum metaphosphate has better moisture resistance than other metaphosphates in fluorophosphate glass. It is better and has a lower refractive index and a larger Abbe number, so that the dispersion of the ultraviolet part of the glass is lower, and the chemical stability and mechanical strength are good. [0003] For example, patent 200710108995, a method for manufacturing high-purity aluminum metaphosphate, the concentration of each metal impurity in the high-purity aluminum metaphosphate is below 5ppm, and the metal is at least one of iron, chromium, nickel, manganese or copper, The mixture obtained by mixing alu...

Claims

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Application Information

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IPC IPC(8): C01B25/44
Inventor 明添明智明雯明实
Owner SICHUAN MINGJING PHOTOELECTRIC TECH
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