Recycling method for waste acid generated during preparation of graphite oxide through liquid-phase chemical method
A chemical method and resource-based technology, applied in chemical instruments and methods, graphene, manganese oxide/manganese hydroxide, etc., can solve the problems of no resource-based comprehensive treatment technology, waste of resources, high acid content, etc., and achieve operating costs Low cost, saving production cost, simple operation effect
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[0030] Example 1
[0031] Use an acid-resistant pump to inject the waste acid into the homogenization tank for homogenization. Pump the homogenized waste acid into the reaction sedimentation tank A, and add the precipitant CaO and Ca(OH)2 to the molar amount of sulfate ions in the waste acid. The mixture is stirred and reacted to form green gypsum (CaSO4·2H2O). After precipitation, the supernatant is pumped to the reaction sedimentation tank B, and the sediment is pumped to the filtration equipment. Solid-liquid separation, the filtrate is discharged into the reaction sedimentation tank B, the filter cake is green gypsum. Add KOH to the reaction sedimentation tank B, adjust the pH value to 9, stir to form Mn(OH)4, then add potassium permanganate to react to form Mn3O4, after precipitation, the supernatant is pumped to the next process, the sediment Pump to filter equipment. Solid-liquid separation, the filtrate is sent to the next process, the filter cake is dried to obtain Mn3...
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[0032] Example 2
[0033] Use an acid-resistant pump to inject the waste acid into the homogenization tank for homogenization. Pump the homogenized waste acid to the reaction sedimentation tank A. Add the precipitant CaO according to the molar amount of sulfate ions in the waste acid, and stir the reaction to form gypsum (CaSO4 ·2H2O), the supernatant after precipitation is pumped to the reaction sedimentation tank B, and the sediment is pumped to the filtration equipment. Solid-liquid separation, the filtrate is discharged into the reaction sedimentation tank B, the filter cake is green gypsum. Add NaOH to the reaction sedimentation tank B, adjust the pH to 10, stir to form Mn(OH)2, then add potassium permanganate to react to form MnO, after precipitation, the supernatant is pumped to the next process, sediment Pump to filter equipment. Solid-liquid separation, the filtrate is sent to the next process, the filter cake is dried to obtain MnO. The collected waste liquid adopts ...
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[0034] Example 3
[0035] Use an acid-resistant pump to inject the waste acid into the homogenization tank for homogenization. Pump the homogenized waste acid into the reaction sedimentation tank A, and add the precipitant CaO and Ca(OH)2 to the molar amount of sulfate ions in the waste acid. The mixture is stirred and reacted to form green gypsum (CaSO4·2H2O). After precipitation, the supernatant is pumped to the reaction sedimentation tank B, and the sediment is pumped to the filtration equipment. Solid-liquid separation, the filtrate is discharged into the reaction sedimentation tank B, the filter cake is green gypsum. Add KOH and NaOH to the reaction sedimentation tank B, adjust the pH to 9.5, stir to form Mn(OH)2, then add sodium hypochlorite and potassium permanganate to form MnO2, after precipitation, the supernatant is pumped to the next channel During the process, the sediment is pumped to the filtration equipment. Solid-liquid separation, the filtrate is sent to the n...
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