Preparation of copper(II)-ammonia complex ion sulfidization activator and sulfidization flotation method for copper oxide ore

Patent metadata

Field	Value
Publication number	US-11618689-B2
Application number	US-202016984079-A
Country	US
Kind code	B2
Filing date	Aug 3, 2020
Priority date	Aug 6, 2019
Publication date	Apr 4, 2023
Grant date	Apr 4, 2023

Abstract

The disclosure relates to mineral processing, and more particularly to a copper(II)-ammonia complex ion sulfidization activator, and its preparation and application. A molar ratio of NH3 to Cu2+ in the active ingredient of the copper(II)-ammonia complex ion sulfidization activator is 2:1-4:1. The preparation method includes: dropwise adding an ammonia solution to a copper salt solution; and adjusting the mixture to pH 6-7.2 with dilute sulfuric acid to obtain the copper(II)-ammonia complex ion sulfidization activator. During the sulfidization flotation for the copper oxide ore, the copper(II)-ammonia complex ion sulfidization activator is added and mixed uniformly with the ore slurry prior to the introduction of the sulfidizing agent.

First claim

What is claimed is:

1. A method of preparing a copper(II)-ammonia complex ion sulfidization activator, the method comprising:
dropwise adding an ammonia solution into a copper salt solution to produce a mixture; and
adjusting the mixture to pH 6-7.2 with dilute sulfuric acid to produce the copper(II)-ammonia complex ion sulfidization activator, wherein a molar ratio of NH 3 to Cu 2+ in an active ingredient of the copper(II)-ammonia complex ion sulfidization activator is 2-4:1.

2. The method of claim 1 , wherein the copper salt solution is selected from the group consisting of copper sulfate solution, copper chloride solution, copper nitrate solution and a combination thereof; and the ammonia solution is selected from the group consisting of ammonium sulfate solution, ammonium chloride solution, ammonium nitrate solution, ammonia water and a combination thereof.

3. The method of claim 1 , wherein a concentration of the copper salt solution is 0.02 mol/L; and a concentration of the ammonia solution is 5-10 mol/L.

4. The method of claim 1 , wherein the ammonia solution is dropwise added to the copper salt solution at a rate of 0.5-2 drops/second.

5. A sulfidization flotation method for a copper oxide ore, comprising:
a) dropwise adding an ammonia solution into a copper salt solution to produce a mixture;
b) adjusting the mixture in step a) to pH 6-7.2 with dilute sulfuric acid to produce the copper(II)-ammonia complex ion sulfidization activator, wherein a molar ratio of NH 3 to Cu 2+ in an active ingredient of the copper(II)-ammonia complex ion sulfidization activator is 2-4:1;
c) introducing the copper(II)-ammonia complex ion sulfidization activator to a slurry of the copper oxide ore followed by mixing uniformly to produce a mixture; and
d) adding a sulfidizing agent solution to the mixture in step c) to perform sulfidization flotation to obtain a slurry; adding a mixed collector and a foaming agent to the slurry obtained in step d) followed by mixing uniformly and skimming to obtain concentrate and tailings.

6. The sulfidization flotation method of claim 5 , wherein the sulfidizing agent solution is selected from the group consisting of sodium sulfide solution, sodium hydrosulfide solution, hydrogen sulfide solution and a combination thereof; and an addition amount of the sulfidizing agent solution is 0.2-1.0 mL per gram of the copper oxide ore.

7. The sulfidization flotation method of claim 5 , wherein a concentration of the mixed collector is 8×10 −4 mol/L and an addition amount of the mixed collector is 0.6-1.5 mL per gram of the copper oxide ore; and the mixed collector is a mixture of benzohydroxamic acid and xanthate.

8. The sulfidization flotation method of claim 7 , wherein the mixed collector is a mixture of benzohydroxamic acid and xanthate in a molar ratio of 1:3.

9. The sulfidization flotation method of claim 7 , wherein the xanthate is butyl xanthate, amyl xanthate or a combination thereof.

10. The sulfidization flotation method of claim 8 , wherein the xanthate is butyl xanthate, amyl xanthate or a combination thereof.

11. The sulfidization flotation method of claim 5 , wherein a copper content in the copper oxide ore is 40-55%.

12. The sulfidization flotation method of claim 5 , wherein an addition amount of the copper(II)-ammonia complex ion sulfidization activator is 0.5-3 mL per gram of the copper oxide ore.

13. The sulfidization flotation method of claim 5 , wherein a concentration of the sulfidizing agent solution is 0.2 mol/L.

14. The sulfidization flotation method of claim 5 , wherein the foaming agent is terpineol oil; and an addition amount of the foaming agent is 0.5-1 μL per gram of the copper oxide ore.

Assignees

• Hunan Res Institute For Nonferrous Metals
• Univ Central South

Inventors

• Chen Daixiong
• Zhang Chenyang
• Sun Wei
• Hu Bo
• Zhu Jianyu
• Liu Mengfei
• Zhou Qiqi
• Dong Yanhong

Classifications

• C01G3/14 Primary

  Complexes with ammonia · CPC title

• B03D1/018

  Mixtures of inorganic and organic compounds · CPC title

• B03D1/01 Primary

  containing nitrogen · CPC title

• B03D2203/02

  Ores · CPC title

• B03D1/012

  containing sulfur · CPC title