Method for preparing fluorescence grade strontium carbonate

A strontium carbonate and fluorescence technology, applied in the directions of calcium carbonate/strontium/barium, chemical instruments and methods, luminescent materials, etc., can solve problems such as low production cost, and achieve the effects of low production cost, significant energy saving, and water resources saving

Active Publication Date: 2006-06-21
CHENGDU CHEMPHYS CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the production cost is low, and the preparation method of fluorescent grade high-purity strontium carbonate with superior performance has not been reported so far.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] with SrCl 2 ·6H 2 O is raw material

[0046] industrial strontium salt SrCl 2 ·6H 2 Dissolve O in pure water at 40-80°C, remove the Fe and Pb impurities contained in the conventional method, and remove the Ba and Ca impurities through one recrystallization to obtain SrCl 2 ·6H 2 O, the SrCl 2 ·6H 2 The O Ca content is 0.027%, the Ba content is 0.029%, the Pb and Ni contents are both 2 ·6H 2 Dissolve O in pure water to obtain a solution with a Sr content of 140g / L, raise the temperature to 65°C, add 150ml of H 2 o 2 , then add 2.3gMn 2+ (introduced as manganese acetate), 2.2gMg 2+ (introduced in the form of magnesium chloride), stirred and reacted for 30min, filtered to obtain SrCl 2 solution. The SrCl 2 Put the solution into a reaction kettle with a volume of 300L, raise the temperature to 75°C, and add NH 4 HCO 3 30.9Kg of NH 4 HCO 3 To purify the solution, slowly add dropwise a lanthanum chloride solution containing La0.22g. Gabby NH 4 HCO 3 soluti...

Embodiment 2

[0050] With Sr(NO 3 ) 2 as raw material

[0051] The strontium nitrate after a recrystallization to remove Ba, Ca and other impurities has a Ca content of 0.025%, a Ba content of 0.031%, a Pb and Ni content of 2 o 2 , then add 11gMn 2+ (introduced as manganese nitrate), 8gMg 2+ (introduced in the form of magnesium chloride), after fully stirring, filter to get Sr(NO 3 ) 2 solution. Then pump it into a reaction kettle with a volume of 1000L, raise the temperature to 65°C, and add the purified NH 4 HCO 3 solution (containing NH 4 HCO 3 100Kg). Adding NH 4 HCO 3 At the same time as the solution, slowly dropwise add a sodium silicate solution containing 10.5g of Si, and add NH 4 HCO 3 And sodium silicate, continue to stir and react for 40min, discharge and filter. Then fully wash the filter cake with 1850 liters of pure water at a temperature of 40-85°C, and then dry the strontium carbonate filter cake obtained through washing at a temperature of 110-200°C to obtain...

Embodiment 3

[0054] With Sr(OH) 2 ·8H 2 O is raw material

[0055] 100kg Sr(OH) obtained by conventional removal of Fe, Pb and a recrystallization 2 ·8H 2 O was dissolved in 650 liters of pure water at a temperature of 90-100°C, and 280 liters of NH were added at a temperature of 80-90°C under stirring conditions. 4 HCO 3 Purification solution (including NH 4 HCO 3 64Kg), while adding MnCl dropwise 2 (Mn 2+ 10.2g), NdCl 3 (Nd 3+ 0.58g), SbCl 3 (Sb 3+ 0.9 g) solution. After the feeding is completed, continue to stir and react for 50 minutes, discharge and filter, then wash the filter cake with 1070 liters of pure water at a temperature of 40-70°C, and then dry the strontium carbonate filter cake obtained by washing at a temperature of 100-220°C. That is, 53.4Kg of fluorescent grade strontium carbonate product was obtained.

[0056] This product contains SrCO 3 99.0%, containing 0.019% of Ca, 0.028% of Ba, 0.0001% of Pb, 0.017% of Mn, 0.001% of Nd, and 0.0015% of Sb.

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PUM

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Abstract

The invention discloses the method for preparation of fluorescence strontium carbonate, comprising the following steps: removing the metal impurities, such as Fe, Pb, and Ba, Ca impurities, adding the significance component into strontium saline solution and NH4HCO3 solution, carrying out synthesis reaction, filtering, washing, drying and getting the product. The SrCO3 content of fluorescence strontium carbonate is only 95-99.5%, but when the fluorescence strontium carbonate is used in super long persistence luminescent material, the running quality is good. So the product can be used to produce high grade rare earth long persistence luminescent material whose initial brightness is above 25000mcd/m2, and after glow brightness is above 80mcd/m2. so the product has high capability/price ratio.

Description

technical field [0001] The invention relates to a preparation method of strontium carbonate, an inorganic chemical product, in particular to a preparation method of fluorescent-grade strontium carbonate used for producing rare earth ultra-long afterglow light-storing luminescent materials. Background technique [0002] High-purity strontium carbonate (SrCO 3 ) is an important inorganic chemical product. With the rapid development of electronics, information and other industries, the use of high-purity strontium carbonate is increasing year by year, and generally speaking, its purity requirements are also getting higher and higher. The main applications of high-purity strontium carbonate are fluorescent materials and electronic components. Electronic grade high-purity strontium carbonate usually requires its average particle size D 50 <1μm; Fluorescent grade high-purity strontium carbonate has slightly different formulas and processes from various manufacturers of rare ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65C01F11/18
Inventor 刘述平
Owner CHENGDU CHEMPHYS CHEM IND
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