Method for removing copper from copper-containing solution and synthesizing copper sulfide crystals

Abstract

This invention relates to a method for removing copper from a copper-containing solution and synthesizing copper sulfide crystals. This method not only efficiently removes copper ions from water but also reduces the use of chemical reagents. Water quality conditions are adjusted, including the molar ratio of sulfide ions to copper ions, hydraulic retention time, reflux ratio, and initial copper concentration. A fluidized bed homogeneous crystallization system is used to synthesize copper sulfide crystal particles to remove copper ions from wastewater.

Claims

1. A method for removing copper from a copper-containing solution and synthesizing copper sulfide crystals, comprising: A fluidized bed reactor is provided, comprising a lower section and an upper section. The lower section is provided with a solution inlet and a reagent inlet, and the upper section is provided with a water outlet. A reflux pipe is provided between the lower section and the upper section. A copper-containing solution and a reagent are separately introduced into the fluidized bed reactor through the solution inlet and the reagent inlet for mixing, wherein the reagent is a sulfide precipitant containing sulfur ions. The copper-containing solution mixed with the reagent flows from the lower section of the reactor to the upper section of the reactor. The copper-containing solution containing the reagent is refluxed to the next section via the reflux pipeline for circulation, so that the copper ions in the copper-containing solution react with the sulfur ions in the reagent to produce copper sulfide particles. The pH value of the reactor is controlled between 2.5 and 3.5, the molar ratio of sulfur ions in the reagent to copper ions in the copper-containing solution is controlled between 0.75 and 1.50, the hydraulic residence time of the reactor is controlled between 40 and 80 minutes, and the reflux ratio of the reactor is controlled between 35.0 and 50.

0.

2. The method as described in claim 1, wherein the reagent is sodium sulfide.

3. The method as described in claim 1, wherein the initial copper concentration is controlled between 750 mg / L and 1250 mg / L.

4. The method as described in claims 1, 2 or 3, wherein the pH of the reactor is controlled between 2.7 and 3.

3.

5. The method as described in claims 1, 2 or 3, wherein the molar ratio of sulfur ions in the reagent to copper ions in the copper-containing solution is controlled between 0.75 and 1.

25.

6. The method as described in claims 1, 2 or 3, wherein the hydraulic residence time of the reactor is controlled between 46 and 80 minutes.

7. The method as described in claims 1, 2 or 3, wherein the reflux ratio of the reactor is controlled between 40.0 and 50.

0.

8. The method as described in claims 1, 2 or 3, wherein the molar ratio of sulfur ions in the reagent to copper ions in the copper-containing solution is controlled between 0.75 and 1.25, the hydraulic residence time of the reactor is controlled between 46 and 80 minutes, and the reflux ratio of the reactor is controlled between 40.0 and 50.

0.

9. A method for removing copper from a copper-containing solution and synthesizing copper sulfide crystals, comprising: A fluidized bed reactor is provided, comprising a lower section and an upper section. The lower section is provided with a solution inlet and a reagent inlet, and the upper section is provided with a water outlet. A reflux pipe is provided between the lower section and the upper section. A copper-containing solution and a reagent are separately introduced into the fluidized bed reactor through the solution inlet and the reagent inlet for mixing, wherein the reagent is a sulfide precipitant containing sulfur ions. The copper-containing solution mixed with the reagent flows from the lower section of the reactor to the upper section of the reactor. The copper-containing solution containing the reagent is refluxed to the next section via the reflux pipeline for circulation, so that the copper ions in the copper-containing solution react with the sulfur ions in the reagent to produce copper sulfide particles. The pH value of the reactor is controlled between 2.5 and 3.5, and the molar ratio of sulfur ions in the reagent to copper ions in the copper-containing solution is controlled between 0.75 and 1.

50.

10. The method as described in claim 9, wherein the reflux ratio of the reactor is controlled between 35.0 and 50.0.

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