Method for regenerating amorphous iron oxide hydroxide and desulfurizer containing amorphous iron oxide hydroxide as active component

1. A method for regenerating amorphous iron oxide hydroxide after being used as a desulfurizer, the method comprising the following steps:

(1) grinding a waste mixture into waste powder, wherein the waste mixture results from use of the amorphous iron oxide hydroxide as a desulfurizer;

(2) preparing the waste powder into a suspension and charging the suspension with a gas comprising oxygen to obtain a slurry comprising the amorphous iron oxide hydroxide and elemental sulfur; and

(3) placing the slurry or a solid resulting from filtering the slurry into a container and charging the slurry or the solid with air so that the elemental sulfur floats and the amorphous iron oxide hydroxide precipitates.

2. The method of claim 1 , wherein prior to grinding, the waste mixture is washed with water.

3. The method of claim 1 , wherein the floated elemental sulfur is separated after step (3).

4. The method of claim 1 , wherein the weight proportion of the waste powder in the suspension is 5-30%.

5. The method of claim 4 , wherein the weight proportion of the waste powder in the suspension is 10-15%.

6. The method of claim 1 , wherein the gas comprising oxygen is air.

7. The method of claim 1 , wherein an auxiliary agent is added to the container to accelerate the floating of the elemental sulfur in step (3).

8. The method of claim 7 , wherein the auxiliary agent is water glass and kerosene.

9. The method of claim 1 , wherein the container in step (3) is a flotation tank.

10. The method of claim 1 , wherein the waste mixture is ground into particles of size 100-400 mesh in step (1).

11. The method of claim 10 , wherein the waste mixture is ground into particles of size 200 mesh.

12. The method of claim 1 , wherein the method is used to regenerate a desulfurizer comprising amorphous iron oxide hydroxide as an active ingredient after the desulfurizer is used to remove sulfur through formation of iron sulfide.

13. A method of regenerating amorphous iron oxide hydroxide after being used as a desulfurizer, the method comprising the following steps:

(a) grinding a waste mixture into a waste powder, wherein the waste mixture results from use of the amorphous iron oxide hydroxide as a desulfurizer;

(b) preparing the waste powder into a suspension and charging the suspension with a gas containing comprising oxygen to obtain a slurry comprising the amorphous iron oxide hydroxide and elemental sulfur; and

(c) filtering the slurry to yield a solid and extracting the elemental sulfur from the solid with a solvent to yield the amorphous iron oxide hydroxide.

14. The method of claim 13 , wherein prior to grinding, the waste mixture is washed with water.

15. The method of claim 13 , wherein the elemental sulfur is separated after the solvent is concentrated.

16. The method of claim 13 , wherein the weight proportion of the waste powder in the suspension is 5-30%.

17. The method of claim 16 , wherein the weight proportion of the waste powder in the suspension is 10-15%.

18. The method of claim 13 , wherein the gas comprising oxygen is air.

19. The method of claim 13 , wherein the solvent is a non-polar solvent.

20. The method of claim 19 , wherein the non-polar solvent is carbon tetrachloride or carbon disulfide.

21. The method of claim 13 , wherein the waste mixture is ground into particles of size 100-400 mesh.

22. The method of claim 21 , wherein the waste mixture is ground into particles of size 200 mesh.

23. The method of claim 13 , wherein the method is used to regenerate a desulfurizer comprising amorphous iron oxide hydroxide as an active ingredient after the desulfurizer is used to remove sulfur through formation of iron sulfide.