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Collinear preparation method for strontium hydrate and strontium carbonate

A technology of strontium hydroxide and strontium carbonate, applied in the direction of calcium carbonate/strontium/barium, calcium/strontium/barium oxide/hydroxide, etc., can solve the problems of difficulty in recycling, environmental pollution, and high content

Inactive Publication Date: 2010-05-12
GUIZHOU REDSTAR DEVING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this preparation method introduces a large amount of sodium ions, which need to be separated after multiple recrystallizations, and the content of sodium and barium in the recrystallization mother liquor is extremely high, which makes it difficult to recycle, and the recovery cost is very high.
Furthermore, the preparation method produces H 2 S gas must be treated with exhaust gas. The result of the exhaust gas treatment introduced in this method is to produce calcium sulfide precipitation, and a large amount of residue will gradually absorb CO 2 The gas releases hydrogen sulfide gas, causing environmental pollution

Method used

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  • Collinear preparation method for strontium hydrate and strontium carbonate
  • Collinear preparation method for strontium hydrate and strontium carbonate
  • Collinear preparation method for strontium hydrate and strontium carbonate

Examples

Experimental program
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Effect test

Embodiment 1

[0012] Take 1kg of 37% by weight SrS clinker, put it in a 5000ml beaker, add 4000ml of deionized water, stir in an airtight furnace and heat to 85°C in an electric furnace, control the SrS concentration to 110g / L, and leaching for 2 hours. Then use a latex tube to siphon the supernatant into a clean 5000ml beaker, seal the beaker with a plastic bag, put it in cooling water and cool it to 35°C, take it out, and carry out suction filtration and separation. 2 Carbonization to produce common SrCO 3 .

[0013] The crude Sr(OH) after suction filtration 2 ·8H 2 O according to 0.8mol / L [Sr 2+ ] was dissolved in deionized water, and 27.5% by weight of H was added in a ratio of 1.5ml / L 2 o 2 , airtightly heat up and stir, keep boiling slightly for 20 minutes, stop heating, filter with slow qualitative filter paper, discard the filter residue, airtightly cool the filtrate to 40°C and then centrifuge for dehydration, the mother liquor is dehydrated with CO 2 Preparation of low-sulfu...

Embodiment 2

[0015] Take 2kg of 42% by weight SrS clinker, put it in a 5000ml beaker, add 4000ml of deionized water, keep warm and leaching in a boiling water bath at 100°C for 3 hours, the actual leaching temperature is 95°C, and control the SrS concentration to 100g / L, during which every Stir once every 30 minutes, after static settling, absorb the supernatant by siphon method, then add 4000ml deionized water, soak for 3 hours in a boiling water bath at 100°C, combine the second clear liquid and put it in a 10L plastic bucket and cool it down to 45°C Separation by suction filtration, carbonization of mother liquor to prepare ordinary SrCO 3 .

[0016] The crude Sr(OH) separated by suction filtration 2 ·8H 2 O according to 0.7mol / L [Sr 2+ ] Dissolved by heating with deionized water, adding 27.5% by weight of H at a ratio of 1.3ml / L 2 o 2 , electric furnace heating, airtight heating and stirring, after boiling, maintain a slight boiling for 25 minutes, stop heating, filter with slow q...

Embodiment 3

[0018] Take 2kg of 42% by weight SrS clinker, put it in a 5000ml beaker, add 4000ml of deionized water, stir in an airtight furnace and heat to 95°C in an electric furnace, control the SrS concentration to 100g / L, and leaching for 3 hours. After static settling, use the siphon method to absorb the supernatant, then add 4000ml of deionized water, and then leaching for 3 hours, combine the secondary supernatant and put it in a 10L plastic bucket, airtightly cool it to 30°C, and then separate it by suction filtration, carbonize the mother liquor to prepare ordinary SrCO 3 .

[0019] The crude Sr(OH) separated by suction filtration 2 ·8H 2 O according to 0.7mol / L [Sr 2+ ] Dissolved by heating with deionized water, adding 27.5% by weight of H at a ratio of 1.3ml / L 2 o 2 , electric furnace heating, airtight heating and stirring, after boiling, maintain a slight boiling for 25 minutes, stop heating, filter with slow qualitative filter paper, discard the filter residue, seal the f...

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Abstract

The invention relates to a collinear preparation method for strontium hydrate and strontium carbonate, which comprises the following steps: A, performing hot leaching on a SrS clinker aggregate at the temperature between 75 and 95DEG C, and controlling the concentration of SrS solution in a range between 70 and 110g / L; B, sealing the SrS solution, stirring, and cooling to a temperature of between 30 and 45DEG C for suction and filtration separation to obtain Sr(OH)2 8H2O solid; C, dissolving the Sr(OH)2 8H2O solid with water, adding H2O2, heating to boil for 15 to 30 minutes, and filtering; D, sealing the obtained filter liquor, cooling to a temperature of between 35 and 45DEG C, performing centrifugal dehydration, and separating out crystal Sr(OH)2 8H2O; and E, carbonizing mother liquor remained in the step D with CO2 at the temperature of between 75 and 85DEG C to obtain SrCO3. The method for preparing the strontium hydrate and the strontium carbonate has low cost, and no introduction of other metal ions.

Description

technical field [0001] The invention relates to a method for preparing strontium hydroxide and strontium carbonate, in particular to a method for collinearly preparing strontium hydroxide and strontium carbonate by using strontium sulfide. Background technique [0002] Strontium hydroxide is widely used as the parent material of high-purity strontium carbonate, etc., and the commonly used preparation methods include hydrochloric acid liquid alkali method and pyrolysis method. The process cost of the hydrochloric acid liquid alkali method is high, and the process yield is low due to repeated crystallization and purification. The pyrolysis method consumes a lot of energy, and the natural SrCO 3 The ore grade has declined, the reserves have been exhausted, and the mine has basically withdrawn. This requires figuring out ways to produce and process strontium hydroxide from low-grade ores. Regarding the method for preparing strontium sulfide by using celestite, many methods ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/10C01F11/18
Inventor 姜志光华东
Owner GUIZHOU REDSTAR DEVING
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