New method for decolorizing and whitening phosphogypsum
A phosphogypsum, a new method of technology, applied in the direction of calcium/strontium/barium sulfate, etc., can solve the problems of phosphogypsum decolorization and whitening that are rarely reported in literature, and achieve good whitening effect, simple operation process and low operation cost Effect
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Example Embodiment
[0018] Example 1:
[0019] The decolorization and whitening method of phosphogypsum in this embodiment is as follows:
[0020] a, calcination
[0021] Weigh 20 g of the ground phosphogypsum in a calcination crucible, place it in a muffle furnace at 550°C, calcinate at high temperature for 60 minutes, cool, and set aside.
[0022] b, acid leaching
[0023] Weigh 10g of the calcined phosphogypsum obtained in step a into a single-neck flask, add 40g of 30wt% sulfuric acid solution, keep the temperature at 90°C, stir and react for 180min, after the reaction, filter and separate, wash, dry, and grind to obtain decolorization and whitening treatment After the phosphogypsum sample, its whiteness was measured to be 87.1%.
Example Embodiment
[0024] Example 2:
[0025] The decolorization and whitening method of phosphogypsum in this embodiment is as follows:
[0026] a, calcination
[0027] Weigh 20g of the ground phosphogypsum in a calcination crucible, place it in a muffle furnace at 400°C, calcinate at a high temperature for 40 minutes, cool, and set aside.
[0028] b, acid leaching
[0029] Weigh 10g of the calcined phosphogypsum obtained in step a into a single-necked flask, add 40g of 35wt% hydrochloric acid solution, keep the temperature at 85°C, stir and react for 150min, after the reaction, filter and separate, wash, dry, and grind to get decolorization and whitening treatment The whiteness of the latter phosphogypsum sample was 79.8%.
Example Embodiment
[0030] Example 3:
[0031] The decolorization and whitening method of phosphogypsum in this embodiment is as follows:
[0032] a, calcination
[0033] Weigh 20 g of the ground phosphogypsum in a calcination crucible, place it in a muffle furnace at 650°C, calcinate at high temperature for 70 minutes, cool, and set aside.
[0034] b, acid leaching
[0035] Weigh 10g of the calcined phosphogypsum obtained in step a into a single-necked flask, add 40g of 25wt% nitric acid solution, keep the temperature at 90℃, stir and react for 120min. After the reaction, filter and separate, wash, dry, and grind to obtain decolorization and whitening treatment After the phosphogypsum sample, its whiteness was measured to be 81.9%.
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