Acid washing and centrifugal dewatering technique of silicon carbide
A centrifugal dehydration, silicon carbide technology, applied in the direction of silicon carbide, carbide, other chemical processes, etc., can solve problems such as affecting the level of abrasive mechanization and unfavorable modern management
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Embodiment 1
[0028] A pickling centrifugal dehydration process for silicon carbide, comprising steps:
[0029] 1) Put clean water into the pickling bucket, turn on the mixer, and put in the mixture of silicon carbide abrasive and sodium hydroxide to be washed;
[0030] 2) under stirring state, add concentrated acid solution, make the acid concentration in the bucket be 8%;
[0031] 3) Continue to stir, send in steam, make the water temperature reach 70°C, and cook for 2 hours;
[0032] 4) Rinse with water for 2 hours;
[0033] 5) Centrifuge and dehydrate at 2000r / min for 50s.
[0034] The mixing ratio of silicon carbide abrasive and sodium hydroxide in the step 1) is 4:1 by mass.
[0035] The concentrated acid in the step 2) is a mixture of concentrated nitric acid and concentrated hydrochloric acid.
[0036] The volume ratio of the concentrated nitric acid to concentrated hydrochloric acid is 1:3.
[0037] The pH value after washing with clear water in the step 4) is 7.
Embodiment 2
[0039] A pickling centrifugal dehydration process for silicon carbide, comprising steps:
[0040] 1) Put clean water into the pickling bucket, turn on the mixer, and put in the mixture of silicon carbide abrasive and sodium hydroxide to be washed;
[0041] 2) Keep stirring, add concentrated acid solution, so that the acid concentration in the barrel is 10%;
[0042] 3) Continue to stir, send in steam, make the water temperature reach 75°C, and cook for 2.5 hours;
[0043] 4) Rinse with water for 3 hours;
[0044] 5) Centrifuge and dehydrate at 2500r / min for 60s.
[0045] The mixing ratio of silicon carbide abrasive and sodium hydroxide in the step 1) is 4.5:1 by mass.
[0046] The concentrated acid in the step 2) is a mixture of concentrated nitric acid and concentrated hydrochloric acid.
[0047] The volume ratio of the concentrated nitric acid to concentrated hydrochloric acid is 1:4.
[0048] The pH value after washing with clear water in the step 4) is 7.
Embodiment 3
[0050] A pickling centrifugal dehydration process for silicon carbide, comprising steps:
[0051] 1) Put clean water into the pickling bucket, turn on the mixer, and put in the mixture of silicon carbide abrasive and sodium hydroxide to be washed;
[0052] 2) under stirring state, add concentrated acid solution, make the acid concentration in the bucket be 12%;
[0053] 3) Continue to stir, send in steam, make the water temperature reach 80°C, and cook for 3 hours;
[0054] 4) Rinse with water for 4 hours;
[0055] 5) Centrifuge and dehydrate at 3000r / min for 70s.
[0056] The mixing ratio of silicon carbide abrasive and sodium hydroxide in the step 1) is 5:1 by mass.
[0057] The concentrated acid in the step 2) is a mixture of concentrated nitric acid and concentrated hydrochloric acid.
[0058] The volume ratio of the concentrated nitric acid to concentrated hydrochloric acid is 1:5.
[0059] The pH value after washing with clear water in the step 4) is 7.
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