Method for removing bromine from copper powder resources

Abstract

This invention provides a method for removing bromine from copper powder resources, comprising the following steps: providing a copper powder resource containing a bromine compound; providing a nano-zero-valent iron sulfide, the nano-zero-valent iron sulfide having a multilayer structure, wherein from the inside out are a zero-valent iron layer, an iron oxide layer, and an iron sulfide layer, the iron sulfide layer being composed of ferrous sulfide, the chemical formula of which is FeS; and subjecting the copper powder resource to a thermal decomposition process, wherein the iron sulfide layer adsorbs the bromine compound, and the bromine compound reacts with the zero-valent iron layer to generate ferric bromide, and the ferric bromide is removed to obtain a debrominated copper resource. This method can reduce the generation of bromodioxins in copper powder resources during the thermal decomposition process.

Claims

1. A method for removing bromine from copper powder resources, comprising the following steps: providing a copper powder resource containing a bromine compound; providing a nano-sized zero-valent iron sulfide, the nano-sized zero-valent iron sulfide having a multilayer structure, wherein from the inside out are sequentially a zero-valent iron layer, an iron oxide layer, and an iron sulfide layer, the iron sulfide layer being composed of ferrous sulfide, the ferrous sulfide having the chemical formula FeS; and subjecting the copper powder resource to a thermal decomposition process, wherein the iron sulfide layer adsorbs the bromine compound, and the bromine compound reacts with the zero-valent iron layer to generate ferric bromide, and the ferric bromide is removed to obtain a debrominated copper resource; wherein... The weight ratio of the copper powder resource to the sulfide nano-zero valent iron is 10:1 to 100:

1.

2. The method for removing bromine from copper powder resources as described in claim 1, wherein, The particle size of this sulfide nano-zero valent iron ranges from 0.96 to 1.21 μm.

3. The method for removing bromine from copper powder resources as described in claim 1, wherein, The hydrophilic contact angle of this sulfide nano-zero valent iron is between 140 and 153 degrees.

4. The method for removing bromine from copper powder resources as described in claim 1, wherein, The process temperature of the pyrolysis process is between 630 and 670°C, and the holding time of the pyrolysis process is between 10 and 60 minutes.

5. The method for removing bromine from copper powder resources as described in claim 1 further includes processing the debrominated copper resources into a recycled copper material using a post-processing process, wherein the purity of the recycled copper material is not less than 2N, and the post-processing process is pyrometallurgical smelting and / or electrolytic refining.

6. The method for removing bromine from copper powder resources as described in claim 1, wherein, The method for manufacturing the sulfide nano-zero valent iron includes the following steps: Ferrous sulfate is dissolved in an alcohol solution to obtain a first solution; Sodium borohydride is used as a reducing agent in the first solution, and zero-valent iron is obtained by reduction in the first solution; and the zero-valent iron is subjected to a sulfidation modification reaction with sulfur powder to produce the sulfidated nano-zero-valent iron with a hydrophobic surface.

7. The method for removing bromine from copper powder resources as described in claim 6, wherein, The weight ratio of the sulfur powder to the zero-valent iron is 10:

1.

8. The method for removing bromine from copper powder resources as described in claim 6, wherein, The process temperature for this sulfidation modification reaction is between 20 and 40°C.

9. The method for removing bromine from copper powder resources as described in claim 6, wherein, The volume of the first solution is 500 ml, and the content of sodium borohydride in it is between 0.5 and 5 g.

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