Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

A method for efficiently separating and recovering zinc and cobalt from purified cobalt slag

A cobalt slag and high-efficiency technology, applied in the field of comprehensive recovery of hydrometallurgy, can solve the problems of comprehensive recovery and treatment of difficult metal resources, difficult recovery and regeneration of pharmaceuticals, and few metal resource processes, and achieves low cost, easy operation and high recovery efficiency. Effect

Active Publication Date: 2019-12-10
ZHENGZHOU UNIV
View PDF5 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, zinc powder replacement method and organic precipitation method are mostly used in the purification of leaching liquid in zinc hydrometallurgy production. Zinc powder replacement method requires a large amount of zinc powder, which will produce a large amount of purification slag. The purification slag not only contains a large amount of unreacted zinc powder, but also It also contains high-grade cobalt, which has extremely high economic value, but due to the low efficiency of zinc replacement, the content of zinc in cobalt slag is much higher than that of cobalt, and further purification is required to achieve efficient extraction of cobalt
The zinc in the slag is usually recovered by sulfuric acid leaching, and the leached slag also contains rich metal resources such as copper, cobalt, and cadmium, and is usually disposed of in the form of stockpiling or selling as intermediate slag; it is purified by organic compounds When removing cobalt, the cost is high, and the reagents are difficult to recycle and regenerate; in addition, the purified cobalt slag formed by this method is also difficult to comprehensively recycle the metal resources in it.
[0004] In view of the current situation that there are few metal resource processes for the comprehensive recovery and purification of cobalt slag, this patent discloses a process for treating the cobalt slag purified by the zinc powder replacement method, which can effectively realize the separation of zinc and cobalt and the efficient separation of zinc and cobalt step recovery

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method for efficiently separating and recovering zinc and cobalt from purified cobalt slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A method for efficiently separating and recovering zinc and cobalt from purified cobalt slag, the specific steps are as follows:

[0031] Step 1, sulfuric acid leaching process:

[0032] Use sulfuric acid with a concentration of 1mol / L to leaching cobalt slag with a cobalt content of 0.5% in wet zinc smelting. The leaching temperature is 40°C, the leaching time is 40min, and the solid-to-liquid ratio is 5:1. After the reaction is completed, use a filter to filter to obtain zinc-rich , cobalt leaching solution and leaching slag containing copper, zinc, and cadmium. The leaching rate of zinc and cobalt is determined to be over 90% by atomic absorption spectrometry, and the leaching slag is used to recover zinc through the wet zinc smelting process;

[0033] Step 2, leachate neutralization and precipitation process:

[0034] A sodium hydroxide solution with a mass fraction of 45% is used to neutralize the leaching solution, the pH of the solution is adjusted to be 11, the...

Embodiment 2

[0040] Use sulfuric acid with a concentration of 1mol / L to leaching cobalt slag with a cobalt content of 1% by hydro-method zinc smelting. The leaching temperature is 70°C, the leaching time is 20 minutes, and the solid-to-liquid ratio is 5:1. After the reaction is completed, use a filter to filter to obtain zinc-rich , cobalt leaching solution and leaching slag containing copper, zinc, and cadmium. The leaching rate of zinc and cobalt is determined to be over 90% by atomic absorption spectrometry, and the leaching slag is used to recover zinc through the wet zinc smelting process;

[0041] Step 2, leachate neutralization and precipitation process:

[0042] The leaching solution is neutralized with an ammonia solution with a mass fraction of 55%, the pH of the solution is adjusted to be 13, the reaction temperature is 60° C., and the reaction time is 30 minutes. After the reaction is completed, filter with a filter to obtain a zincate solution and high-cobalt slag. Realize the...

Embodiment 3

[0048] Use a concentration of 1.5mol / L sulfuric acid to leaching the cobalt smelting cobalt slag with a cobalt content of 1.5%. The leaching temperature is 55°C, the leaching time is 30min, and the solid-to-liquid ratio is 7:1. After the reaction is completed, filter it with a filter to obtain Zinc and cobalt leaching solution and leaching slag containing copper, zinc and cadmium, the leaching rate of zinc and cobalt is determined to be over 90% by atomic absorption spectrometry, and the leaching slag is used to recover zinc through the wet zinc smelting process;

[0049] Step 2, leachate neutralization and precipitation process:

[0050] A sodium hydroxide solution with a mass fraction of 65% is used to neutralize the leaching solution, the pH of the solution is adjusted to be 15, the reaction temperature is 70° C., and the reaction time is 60 minutes. After the reaction is completed, filter with a filter to obtain zincate solution and high cobalt slag, realize efficient sepa...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention belongs to the technical field of hydrometallurgy comprehensive recycling and relates to a method of efficiently isolating and recycling zinc and cobalt from purified cobalt slag. The method herein comprises: 1) leaching out purified cobalt slag via sulfuric acid to obtain leached slag; 2) using an alkaline solution to neutralize leachate; 3) using sulfuric acid to neutralize zincatesolution to obtain sulfate solution and zinc hydroxide; calcining the cobalt slag under nitrogen protection to obtain finished high-purity cobalt oxide. Efficient separation of zinc and cobalt is achieved by making use of only the alkali solution PH difference of zinc hydroxide and cobalt hydroxide; the zincate solution and cobalt hydroxide slag attained from an alkali precipitation process are treated further respectively to recycle zinc and cobalt, operations are simple, the recycling efficiency is high; the sulfate solution attained herein can be returned to the alkali precipitating procedure, the material consumption and production cost are reduced, and the whole process has no emission of wastewater and waste gas, enables valuable metals to be comprehensively recycled and meets the requirement on clean production.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy comprehensive recovery, in particular to a method for efficiently separating and recovering zinc and cobalt from purified cobalt slag. Background technique [0002] Cobalt is a strategic metal resource that supports the development of high-tech fields. With the popularity of electronic products and the promotion of new energy vehicles, China has become the third largest consumer of cobalt after the United States and Japan. However, my country's reserves only account for 1.1% of the world's total reserves, and its dependence on foreign countries exceeds 90%. Moreover, my country's cobalt ore resources are mainly associated with zinc, copper, and nickel sulfide ores, with an average grade of 0.03-0.2%. Due to the low grade of cobalt resources in my country and the majority of associated ores, deep smelting of cobalt-containing minerals to directly extract cobalt is not only difficult and co...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/04C22B19/30C22B19/20C22B23/00
CPCC22B7/008C22B7/04C22B19/24C22B19/26C22B19/30C22B23/0446C22B23/0453Y02P10/20
Inventor 黄宇坤韩桂洪黄艳芳彭伟军耿阳博曹亦俊范桂侠张永胜
Owner ZHENGZHOU UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Eureka Blog
Learn More
PatSnap group products