Method for preparing calcium sulfate whiskers by utilizing sulfate radical in acid-precipitated lignin black liquor
A calcium sulfate whisker and acid-precipitated lignin technology, which is applied in chemical instruments and methods, single crystal growth, crystal growth, etc., can solve the problems affecting the transformation process and the difficulty of calcium sulfate whiskers, and achieve high economic value and realize The effect of resource utilization and relieving the pressure of sewage treatment
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Embodiment 1
[0049] Take 2L of the lignin suspension produced in the paper industry and vacuum filter it with a 300-mesh polypropylene filter cloth to obtain lignin black liquor. The obtained black liquor was ultrasonicated for 10 min, and 5wt% H was pumped dropwise using a peristaltic pump. 2 SO 4 , keep stirring during the process, just at room temperature, adjust the pH to 2.5, make the lignin settle, and keep the pH not higher than 2.5 and continue to stir for 2 hours; then use an ultracentrifuge to separate solid-liquid at 12000rpm for 10 minutes, and obtain The supernatant liquid of polysulfate ion (recording sulfate content is 30g / L), slowly add a small amount of calcium hydroxide solid powder, the process keeps stirring fully, after the pH is stable, continue to add calcium hydroxide powder, until the pH is stable Between 5.5 and 7.0, continue to stir for 1h to make it fully react. Then add lactic acid with a mass fraction of 0.1%, and after fully stirring, the slurry is directly...
Embodiment 2
[0052] Take 2L of the lignin suspension produced in the paper industry and vacuum filter it with a 300-mesh polypropylene filter cloth to obtain lignin black liquor. The obtained black liquor was ultrasonicated for 20min, and 30wt% H was pumped dropwise using a peristaltic pump. 2 SO 4 , keep stirring during the process, just at room temperature, adjust the pH to 1.5, make the lignin settle, and keep the pH not higher than 1.5 and continue to stir for 2h; then use an ultracentrifuge to separate solid-liquid at 12000rpm for 15min, and obtain The supernatant liquid of polysulfate ion (recording sulfate content is 45g / L), slowly adds a small amount of calcium oxide solid powder, and the process keeps stirring fully, and after the pH is stable, continue to add calcium oxide powder until the pH is stable at 5.5 Between ~7.0, continue to stir for 1h to make it fully react. Then add citric acid with a mass fraction of 0.3%, and after fully stirring, transfer the slurry directly to ...
Embodiment 3
[0055] Take 2L of the lignin suspension produced in the paper industry and vacuum filter it with a 300-mesh polypropylene filter cloth to obtain lignin black liquor. The obtained black liquor was ultrasonicated for 20min, and 50wt% H was pumped dropwise using a peristaltic pump. 2 SO 4 , keep stirring during the process, adjust the pH to 1.0, make the lignin settle, and keep the pH not higher than 1.0 and continue to stir for 1h; then use an ultracentrifuge to separate solid-liquid at 14000rpm for 20min, and obtain a product containing more sulfate ions. The supernatant liquid (the measured sulfate content is 55g / L), slowly add a small amount of calcium hydroxide solid powder, the process is kept fully stirred, after the pH is stable, continue to add calcium hydroxide powder until the pH is stable at 5.5 to 7.0 Between, continue to stir 2h, make it fully react. Then add malic acid with a mass fraction of 0.5%, and after fully stirring, transfer the slurry directly to a stain...
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