Treatment method of acidic chromium-containing electroplating wastewater
A treatment method, chromium electroplating technology, is applied in the field of treatment of acidic chromium-containing electroplating wastewater, which can solve the problems of large dosage of chemicals, incomplete copper and nickel treatment, etc., achieve low operating cost, realize safe reuse, and high operability and the effect of applying the value
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Embodiment 1
[0021] Take 10mL of hydrazine hydrate and mix and dilute with 50mL of water for use; Weigh 8g of ferrous sulfate and 2g of polyferric sulfate to mix, and then dissolve the mixture in 100mL of water to form a composite iron salt solution for use; Weigh 0.1 g Solid polyacrylamide is dissolved in 100 mL of water and prepared into a polyacrylamide solution with a concentration of 0.1% for use.
[0022] Take 10 mL of acidic chromium-containing electroplating wastewater, add 0.6 mL of hydrazine hydrate diluent to adjust the pH of the solution to 8.8, stir well for 20 minutes, then add 0.8 mL of composite iron salt solution, mix well for 5 minutes, then add 0.02 mL of polyacrylamide solution, and mix Let it homogenize for 5 minutes and filter with filter paper. The acidic chromium-containing electroplating wastewater before and after treatment was tested, and the results are shown in Table 1.
[0023] Table 1. Test results of acidic chromium-containing electroplating wastewater before an...
Embodiment 2
[0027] Take 10mL of hydrazine hydrate and mix and dilute with 40mL of water for use; Weigh 8g of ferrous sulfate and 2g of polyferric sulfate to mix, and then dissolve the mixture in 100mL of water to form a composite iron salt solution for use; Weigh 0.1 g Solid polyacrylamide is dissolved in 100 mL of water and prepared into a polyacrylamide solution with a concentration of 0.1% for use.
[0028] Take 10 mL of acidic chromium-containing electroplating wastewater, add 0.6 mL of hydrazine hydrate diluent to adjust the pH of the solution to 8.8, stir well for 20 minutes, then add 0.6 mL of composite iron salt solution, mix well for 5 minutes, then add 0.03 mL of polyacrylamide solution, and stir 2min, filter paper filter. The acidic chromium-containing electroplating wastewater before and after treatment was tested, and the results are shown in Table 2.
[0029] Table 2. Test results of acidic chromium-containing electroplating wastewater before and after treatment in Example 2
[0...
Embodiment 3
[0033] Take 10mL of hydrazine hydrate and mix and dilute with 30mL of water for use; Weigh 8g of ferrous sulfate and 2g of polyferric sulfate to mix, then dissolve the mixture in 110mL of water to form a composite iron salt solution for use; Weigh 0.3 g Solid polyacrylamide is dissolved in 100 mL of water and prepared into a polyacrylamide solution with a concentration of 0.3% for use.
[0034] Take 10 mL of acidic chromium-containing electroplating wastewater, add 0.5 mL of hydrazine hydrate diluent to adjust the pH of the solution to 8.5, stir well for 10 minutes, then add 0.6 mL of composite iron salt solution, mix well for 5 minutes, then add 0.01 mL of polyacrylamide solution, and stir 3min, filter paper filter. The acidic chromium-containing electroplating wastewater before and after treatment was tested, and the results are shown in Table 3.
[0035] Table 3. Test results of acidic chromium-containing electroplating wastewater before and after treatment in Example 3
[0036]...
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