Preparation method of strontium carbonate for production of glass substrate

A glass substrate, strontium carbonate technology, applied in the direction of strontium carbonate, calcium carbonate/strontium/barium, etc., can solve the problems of inability to meet high consistency requirements, poor product quality consistency, low resource utilization, etc., to reduce the chance of aggregation and sintering , good consistency, the effect of process environmental protection

Active Publication Date: 2019-01-22
SOUTHWEAT UNIV OF SCI & TECH
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main production method of strontium carbonate in my country is the carbon reduction method. Because this method has low ore requirements, it is very suitable for the existing ore quality in my country. The product quality basically meets the requirements of domestic and foreign users, and the cost is low. Serious, low resource utilization rate, low purity, high content of harmful elements, especially sulfur, quality does not meet the requirements of high-purity strontium carbonate for flat panel display glass substrates
Due to ore grade fluctuations, the product quality consistency of the Strontium ore thermal reduction method is poor, and it cannot meet the high consistency requirements of the product requirements of this project.

Method used

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  • Preparation method of strontium carbonate for production of glass substrate

Examples

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Embodiment 1

[0027] A method for preparing strontium carbonate for producing glass substrates, comprising the following steps:

[0028] Step 1: Add 20kg of strontium chloride to 80kg of distilled water, stir to dissolve, then add 0.5kg of ammonia and 1kg of hydrogen peroxide, and stir for 10 minutes; filter, add 0.5kg of dilute sulfuric acid to the filtrate, stir for 10 minutes, filter, and use sodium hydroxide to dissolve the filtrate Adjust the pH to 9, heat the filtrate to 100°C, keep it warm for 10min, and then filter to obtain the impurity-removed strontium chloride solution;

[0029] Step 2, get 20kg ammonium bicarbonate and add in 80kg distilled water, stir and dissolve, obtain ammonium bicarbonate solution;

[0030]Step 3. Take strontium chloride solution and ammonium bicarbonate solution with a volume ratio of 1:1 and add them to the crystallization reactor with multi-zone feeding and multi-zone reaction, and then add the crystal form control agent. , stirred and reacted for 1h; ...

Embodiment 2

[0035] A method for preparing strontium carbonate for producing glass substrates, comprising the following steps:

[0036] Step 1: Add 50kg of strontium chloride into 100kg of distilled water, stir to dissolve, then add 1kg of ammonia water and 2kg of hydrogen peroxide, stir for 30 minutes; filter, add 1.5kg of dilute sulfuric acid to the filtrate, stir for 30 minutes, filter, use ammonia water to adjust the pH of the filtrate to 12, heat the filtrate to 100°C, keep it warm for 10min, and then filter to obtain a strontium chloride solution;

[0037] Step 2, get 50kg ammonium bicarbonate and add in 100kg distilled water, stir and dissolve to obtain ammonium bicarbonate solution;

[0038] Step 3. Take strontium chloride solution and ammonium bicarbonate solution with a volume ratio of 1:2 and add them to the crystallization reactor with multi-zone feeding and multi-zone reaction, and then add the crystal form control agent. , stirred and reacted for 3h; obtained reaction materi...

Embodiment 3

[0042] A method for preparing strontium carbonate for producing glass substrates, comprising the following steps:

[0043] Step 1: Take 30kg of strontium chloride and add it to 90kg of distilled water, stir to dissolve, then add 0.6kg of ammonia and 1.5kg of hydrogen peroxide, stir for 20min; filter, add 1kg of dilute sulfuric acid to the filtrate, stir for 30min, filter, and use ammonia to adjust the pH Adjust to 10, heat the filtrate to 100°C, keep it warm for 10 minutes, and then filter to obtain a strontium chloride solution;

[0044] Step 2, get 30kg ammonium bicarbonate and add in 90kg distilled water, stir and dissolve, obtain ammonium bicarbonate solution;

[0045] Step 3: Take strontium chloride solution and ammonium bicarbonate solution with a volume ratio of 1:1 and add them to a crystallization reactor with multi-zone feeding and multi-zone reaction, then add a crystal form control agent, at a temperature of 50°C , stirred and reacted for 2h; obtained reaction mat...

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Abstract

The invention discloses a preparation method of strontium carbonate for producing a glass substrate. The preparation method comprises the steps of adding a purified strontium chloride solution and an ammonium bicarbonate solution into a multi-zone feeding and multi-zone reaction crystallization reaction kettle, adding a crystal form control agent for reaction, separating reaction materials, rinsing a solid, and adding the rinsed solid into a drum-type multiple temperature zone roasting furnace for roasting to form strontium carbonate for producing the glass substrate. According to the method, the crystal form control agent is added in a reaction; the aggregation problem of crystals can be solved; the change of a product from a club-shaped crystal form to a spherical crystal form can be achieved; and the particle size uniformity of the product is improved. The multi-zone feeding and multi-zone reaction crystallization reaction kettle is adopted; the multi-zone feeding is achieved; at the same time, the reaction kettle is internally provided with multiple reaction zones; a matrix supersaturation degree in a reaction process is sufficiently reduced; the reaction crystallization performance is improved; and the crystal form optimized product is obtained.

Description

technical field [0001] The invention relates to a preparation method of strontium carbonate, in particular to a preparation method of strontium carbonate used for producing glass substrates. Background technique [0002] The flat-panel TV represented by LCD can be regarded as the most popular consumer electronics product in current sales. If you want to ask what is the most critical component, it is undoubtedly the glass substrate (Glass Substrate) - not only two glass substrates are included in each flat panel display panel, but also a large number of processing processes must be completed on the glass substrate; When the panel production line is updated, it is even more necessary for the glass substrate manufacturer to provide the glass substrate used in the new generation production line, otherwise everything is empty talk. There are many strict standards and requirements for glass substrates for flat panels in terms of thermal stability, optical and chemical properties,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/18
CPCC01F11/187C01P2004/61C01P2006/80
Inventor 竹文坤段涛姚卫棠范勇军汤明松王茜
Owner SOUTHWEAT UNIV OF SCI & TECH
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