Method for preparing anti-caking high-purity electronic-grade strontium nitrate

A strontium nitrate, high-purity technology, applied in the direction of calcium/strontium/barium nitrate, etc., can solve the problems of affecting the evaporation crystallization process, fine strontium nitrate crystal grains, low product purity, etc., to achieve unique methods, uniform particle size, and impurity The effect of low content

Inactive Publication Date: 2016-04-06
CHANGZHOU JUNCHENG MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem that the present invention mainly solves: in the process of preparing strontium nitrate for the current commonly used strontium ore and witherite method, although the yield of strontium nitrate can be improved, but in the preparation process, due to strontium nitrate at a higher concentration Crystallization in calcium nitrate solution will cause isomorphic substitution, which affects the evaporation crystallization process, resulting in low product purity, fine strontium nitrate crystal grains, and the current situation of easy agglomeration. Add nitric acid to react after crushing and pulping heavy stones to form nitric acid solution, then add sodium hydroxide solution to the nitric acid solution to form calcium hydroxide precipitate, then collect the supernatant by centrifugation, add nitric acid, react, mature, and filter Obtain the filtrate, finally cool and crystallize the obtained filtrate, remove impurities and filter, then evaporate and crystallize, and dry, so as to obtain the preparation method of anti-caking high-purity electronic-grade strontium nitrate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0022]First, take 500g of high-calcium strontite and 700g of witherite, pour them into a crusher for coarse crushing, process for 2 minutes, pass through a 50-mesh sieve, and then put the sieved mixed particles into a high-speed ball mill, and add a particle size of 4mm The stainless steel balls are milled for 10 minutes at a ball milling speed of 500r / min until the particle size is <0.08mm to obtain a mixed powder, and then the mixed powder obtained is poured into a container, and 70% of the powder mass is added to the water, and mixed evenly , to obtain a mixed slurry; then slowly add a nitric acid solution with a mass concentration of 98% of the mixed slurry quality of 35% in the mixed slurry obtained above, stir evenly with a glass rod, and stand for reaction at 30° C. until the pH value of the reaction solution is 2.5 Until the reaction is completed, add 0.5M sodium hydroxide solution to the reactant according to the solid-to-liquid ratio of 2:1, raise the temperature to 3...

example 2

[0025] First, take 55g of high-calcium strontite and 750g of witherite, pour them into a crusher for coarse crushing, process for 2.5 minutes, pass through a 55-mesh sieve, and then put the sieved mixed particles into a high-speed ball mill, and add a particle size of 4.5mm stainless steel balls were milled for 11 minutes at a ball milling speed of 550r / min until the particle size was <0.08mm to obtain a mixed powder, which was then poured into a container, and 75% of the powder mass was added to it with water. Mix evenly to obtain a mixed slurry; then slowly add a nitric acid solution with a mass concentration of 38% of the mixed slurry and a mass concentration of 98% to the mixed slurry obtained above, stir evenly with a glass rod, and stand for reaction at 31°C until the pH of the reaction solution until the reaction is finished, add 0.5M sodium hydroxide solution to the reactant at a solid-to-liquid ratio of 2.5:1, raise the temperature to 34°C, and keep stirring until no p...

example 3

[0028] First, take 600g of high-calcium strontite and 800g of witherite, pour them into a crusher for coarse crushing, process for 3 minutes, pass through a 60-mesh sieve, and then put the sieved mixed particles into a high-speed ball mill, and add a particle size of 5mm The stainless steel balls are milled for 12 minutes at a ball milling speed of 600r / min until the particle size is <0.08mm to obtain a mixed powder, and then the mixed powder obtained is poured into a container, and 80% of the powder mass is added to the water, and mixed evenly , to obtain a mixed slurry; then slowly add a nitric acid solution with a mass concentration of 40% of the mixed slurry quality and a mass concentration of 98% in the mixed slurry obtained above, stir evenly with a glass rod, and leave to react at 32°C until the pH value of the reaction solution is 3.2 Until the reaction is completed, add 0.5M sodium hydroxide solution to the reactant according to the solid-to-liquid ratio of 3:1, raise ...

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Abstract

The invention discloses a method for preparing anti-caking high-purity electronic-grade strontium nitrate and belongs to the technical field of strontium nitrate preparation. Strontianite and witherite are crushed and pulped and then nitric acid is added for reaction, and a nitric acid solution is generated; then, a sodium hydroxide solution is added into the nitric acid solution, and calcium hydroxide precipitate is generated through reaction; then, supernate is collected through centrifugal separation, nitric acid is added, and a filtered solution is obtained through reaction, curing and filtering; finally, the obtained filtered solution is subjected to cooling crystallization, impurity removal, filtering, evaporation crystallization and drying, and the anti-caking high-purity electronic-grade strontium nitrate is obtained. Examples show that operation is easy and convenient, and the isomorphous substitution phenomenon can not occur in the preparation process. Besides, the prepared strontium nitrate is high in purity, low in impurity content, not prone to caking, capable of reducing production and use cost of clients and worthy of large-scale production and application.

Description

technical field [0001] The invention discloses a method for preparing anti-caking high-purity electronic-grade strontium nitrate, which belongs to the technical field of strontium nitrate preparation. Background technique [0002] Strontium nitrate is a white or light yellow cubic crystal; easily soluble in water, insoluble in nitric acid and dilute ethanol; mainly used in liquid crystal glass substrate, optical glass and phosphor industries, and is an important additive for liquid crystal substrate glass. The refractive index and the function of improving various physical and chemical properties are one of the most important raw materials in the production of liquid crystal glass substrates. [0003] At present, the preparation methods of strontium nitrate include carbonate method, strontite and witherite method. [0004] Among them, (1) the carbonate method refers to mixing industrial strontium nitrate and then adding concentrated nitric acid to react to obtain the corres...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/38
CPCC01F11/38C01P2004/60C01P2006/10C01P2006/80C01P2006/82
Inventor 裴俊张帆
Owner CHANGZHOU JUNCHENG MACHINERY
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