Method for removing sulfur from sulfur-containing solution and synthesizing manganese sulfide crystals

Abstract

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

Claims

1. A method for removing sulfur from a sulfur-containing solution and synthesizing manganese sulfide crystals, comprising: A fluidized bed reactor is provided, comprising a lower section and an upper section. The lower section has a solution inlet and a reagent inlet, and the upper section has a water outlet. A reflux pipe is provided between the lower and upper sections. A sulfur-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 manganese-based metal precipitant containing manganese ions. The sulfur-containing solution mixed with the reagent flows from the lower section of the reactor to the upper section of the reactor. The sulfur-containing solution mixed with the reagent is refluxed back to the lower section through the reflux pipe for circulation, so that the sulfur ions in the sulfur-containing solution react with the manganese ions in the reagent to produce manganese sulfide particles. The pH of the reactor is controlled between 7.5 and 9.0, and the feed molar concentration ratio of manganese ions in the reagent to sulfur ions in the sulfur-containing solution is controlled between 0.8 and 1.

2.

2. The method as described in claim 1, wherein the reagent is manganese chloride or manganese dioxide.

3. The method as described in claim 1, wherein the reflux ratio of the reactor is controlled between 19.5 and 27.

0.

4. The method as described in claims 1, 2 or 3, wherein the reactor contains a support of manganese sulfide crystal particles and the static bed height of the particles is controlled between 0.3 and 0.8 times the length of the lower section of the tube.

5. The method as described in claim 4, wherein the hydraulic residence time of the reactor is controlled between 20 and 80 minutes.

6. The method as described in claims 1, 2 or 3, wherein the feed molar concentration ratio of manganese ions in the reagent to sulfur ions in the sulfur-containing solution is controlled between 0.8 and 1.

1.

7. The method as described in claims 1, 2 or 3, wherein the pH of the reactor is controlled between 7.5 and 8.

5.

8. The method as described in claims 1, 2 or 3, wherein the cross-sectional load of the sulfur-containing solution is controlled between 0.96 and 1.53 kg-m-2h-1.

9. The method as described in claims 1, 2 or 3, wherein different weights of manganese sand are added to the fluidized bed reactor as a support, and the manganese dioxide in the manganese sand is used as an oxidant to remove unprecipitated sulfides.

10. The method as described in claims 1, 2 or 3, wherein the cross-sectional load of the agent is controlled to be less than 3.27 kg-m-2h-1.

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