Method for preparing Sr (NO3)2
A solution and concentration technology, applied in the direction of calcium/strontium/barium nitrate, etc., can solve the problems of high energy consumption for recrystallization and separation, difficult mother liquor treatment, etc., and achieve stable product quality and facilitate large-scale industrial production.
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Embodiment 1
[0017] Will [Sr 2+ ]0.14mol / L strontium polysulfide 10L is placed in a plastic barrel, cover the mouth of the barrel with a film, and directly stir and carbonize with kiln gas at room temperature in a fume hood, control the flow rate of the kiln gas at about 2.5L / min, until the pH of the solution is 6.5 Stop the carbonization, take out the solution and separate it by suction filtration, return the mother liquor to the SrS leaching process, beat the solid with a small amount of deionized water, add 58% HNO under stirring 3 Reaction, control the feeding amount so that [Sr 2+ ]1.5mol / L, when the pH value is 2, stop adding acid, raise the temperature to boiling (95°C) and maintain it for about 15 minutes, add Sr(OH) 2 ·8H 2 O to adjust the pH of the solution to 7.
[0018] The above solution was subjected to suction filtration and separation, and the filter residue was recovered for sulfur. The filtrate was stirred and evaporated in a beaker, separated by suction filtration, an...
Embodiment 2
[0020] Will [Sr 2+ ] Place 10L of 0.17mol / L strontium polysulfide solution in a plastic barrel, cover the mouth of the barrel with a film, stir and carbonize with kiln gas at room temperature in a fume hood, control the flow rate of the kiln gas at about 3.0L / min, and stop when the pH value of the solution is 6.8 Carbonization, take out and separate by suction and filtration, return the mother liquor to the SrS leaching process, wash the filter cake once with 1:4 deionized water, wash at 80-90°C for 1 hour, separate by suction and filtration, and return to the liquid phase for leaching.
[0021] The above washed filter cake was beaten with a small amount of deionized water, and stirred with 58% HNO 3 response, control [Sr 2+ ] The concentration is 2.2mol / L, stop adding acid when the pH value is 2.5, heat up and boil for about 20 minutes, add Sr(OH) 2 ·8H 2 O to adjust the pH value of the solution to 7.5.
[0022] The above solution was separated by suction filtration, and ...
Embodiment 3
[0024] Will [Sr 2+ ] Place 10L of 0.25mol / L strontium polysulfide solution in a plastic bucket, cover the mouth of the bucket with a film, stir and carbonize with kiln gas at room temperature in a fume hood, control the kiln gas flow rate at about 3.0L / min, and stop when the pH value of the solution is 7.0 Carbonization, take out and separate by suction and filtration, return the mother liquor to the SrS leaching process, wash the filter cake once with 1:4 deionized water, wash at 80-90°C for 1 hour, separate by suction and filtration, and return to the liquid phase for leaching.
[0025] The above washed filter cake was beaten with a small amount of deionized water, and stirred with 58% HNO 3 response, control [Sr 2+ ]2.4mol / L, stop adding acid when the pH value is 3, raise the temperature to 90°C and maintain it for about 20 minutes, add Sr(OH) 2 ·8H 2 O to adjust the pH value of the solution to 7.5.
[0026] The above solution was separated by suction filtration, and su...
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