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Preparation method of strontium carbonate

A technology of strontium carbonate and ammonium bicarbonate, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems of the project product with a lot of chlorides, affecting the product purity, focusing on sintering, etc., to reduce the impact, ensure product purity, and prevent aggregation and sintering. Effect

Inactive Publication Date: 2014-04-30
MIANYANG YUANDA NEW MATERIALS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, based on the special requirements of high-purity strontium carbonate for flat panel display glass substrates, such as high purity, high consistency, large particle size, spherical or approximately spherical crystal form, the strontium chloride-ammonium bicarbonate metathesis method is generally used, but there is a large amount of chlorine in the reaction matrix. The formation of ammonium chloride is easy to be wrapped and absorbed by strontium carbonate crystals during the crystallization process, and it is difficult to remove in the subsequent washing and roasting process, resulting in more chlorine radicals in the project product, which directly affects the purity of the product, and is easy to cause in the high-temperature roasting process. Focus on sintering phenomenon, causing damage to the crystal form

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0013] Embodiment 1: at 50 ℃, with 1000g high-purity water, 50g strontium hydroxide is stirred and dissolved in reactor I, is mixed with strontium hydroxide solution, then the ammonium bicarbonate in heating reactor II at 35 ℃, will generate Gas CO 2 and NH 3 Pass it into the reaction kettle I at a flow rate of 50mL / min through the air duct, and at the same time add 10g of dispersant polyacrylamide dropwise at a rate of 8mL / min, and stir and react at 50°C at 40 rpm for 3 hours; The reaction material was centrifuged, and the centrifuged solid was rinsed with high-purity water 8 times, each time for 20 minutes; the rinsed solid was put into a roaster for 90 minutes at 250°C, and then roasted at 600°C for 60 minutes to obtain strontium carbonate.

Embodiment 2

[0014] Embodiment 2: at 30 ℃, with 5000g high-purity water, 500g strontium hydroxide is stirred and dissolved in reactor I, is mixed with strontium hydroxide solution, then the ammonium bicarbonate in heating reactor II at 50 ℃, will generate Gas CO 2 and NH 3 Pass it into the reactor I at a flow rate of 100mL / min through the air duct, and at the same time add 50g of dispersant triethylhexyl phosphoric acid dropwise at a rate of 5mL / min, and stir and react at 40°C at 80 rpm for 5 hours; The completed reaction materials were centrifuged, and the centrifuged solid was rinsed with high-purity water 10 times, each time for 30 minutes; the rinsed solid was put into a roasting furnace for 90 minutes at 250°C, and then roasted at 600°C for 60 minutes to obtain strontium carbonate.

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PUM

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Abstract

The invention discloses a preparation method of strontium carbonate. The preparation method comprises following steps: at a certain temperature, in a reaction vessel I, strontium hydroxide is dissolved in high purity water via stirring, and ammonium hydrogen carbonate in a reaction vessel II is heated; obtained gas CO2 and NH3 are delivered into the reaction vessel I, and a dispersant is added dropwise into the strontium hydroxide solution at a certain speed; an obtained mixture is stirred using a stirrer for reaction at a certain temperature; and an obtained reaction product is subjected to centrifugation, leaching, and roasting so as to obtain strontium carbonate. According to the preparation method, strontium hydroxide and ammonium hydrogen carbonate are taken as raw materials; gas-liquid reaction is adopted; no by-product is obtained; and in addition, the dispersant is added dropwise in reaction processes, and roasting at different temperature is adopted, so that stability of crystal structures and product purity are ensured.

Description

technical field [0001] The invention relates to the technical field of design materials, in particular to a method for preparing strontium carbonate. Background technique [0002] High-purity strontium carbonate is an important inorganic chemical product, mainly used in fluorescent glass, electronic ceramics, magnetic ferrite and other industries and high-tech fields. Among them, based on the special requirements of high-purity strontium carbonate for flat panel display glass substrates, such as high purity, high consistency, large particle size, spherical or approximately spherical crystal form, the strontium chloride-ammonium bicarbonate metathesis method is generally used, but there is a large amount of chlorine in the reaction matrix. The formation of ammonium chloride is easy to be wrapped and absorbed by strontium carbonate crystals during the crystallization process, and it is difficult to remove in the subsequent washing and roasting process, resulting in more chlori...

Claims

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Application Information

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IPC IPC(8): C01F11/18
Inventor 范勇军汤明松张仁达
Owner MIANYANG YUANDA NEW MATERIALS
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