Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for removing hexavalent chromium in process of preparing cobalt nickel hydroxide from laterite-nickel ore

A technology of nickel cobalt hydroxide and laterite nickel ore, which is applied in the field of metallurgy and can solve problems such as unqualified products

Active Publication Date: 2020-08-07
CHINA ENFI ENGINEERING CORPORATION
View PDF6 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide a method for removing hexavalent chromium in the process of preparing nickel-cobalt hydroxide from laterite nickel ore, so as to solve the problem of nickel-cobalt hydroxide produced by the high-pressure acid leaching process in the prior art due to the hexavalent chromium content. Too high and the product is unqualified

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
  • Method for removing hexavalent chromium in process of preparing cobalt nickel hydroxide from laterite-nickel ore
  • Method for removing hexavalent chromium in process of preparing cobalt nickel hydroxide from laterite-nickel ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Taking a laterite nickel mine in Indonesia as the implementation object, the chromium content in the laterite nickel mine is 1.37%. The laterite nickel ore is made into a slurry with a concentration of 28wt%, and the first reducing agent is added to the laterite nickel ore slurry, specifically a composite agent with a ratio of sulfur to pyrite of 1:1, which is mixed with the total amount of the laterite nickel ore. The mass ratio of chromium is 1:1. Preheat to 200°C, then heat up, and carry out high-pressure acid leaching under the conditions of reaction temperature 250°C, acid ore ratio 200Kg / t, and reaction time 1h. After high-pressure leaching, the concentration of hexavalent chromium is less than 0.5mg / L. The leaching rates were 95.25% and 91.04%, respectively.

Embodiment 2

[0056] The difference from Example 1 is only that the chromium content in the laterite nickel ore is 2.14%, the first reducing agent is sulfur alone, the mass ratio of the first reducing agent to the total chromium in the laterite nickel ore is 1:3, and the content of Ni and Co The leaching rates are 95.81% and 91.45% respectively; the concentration of hexavalent chromium after high pressure leaching is less than 0.5mg / L.

Embodiment 3

[0058] The difference from Example 1 is only that the chromium content in the laterite nickel ore is 2.42%, the ratio of sulfur to pyrite is 4:1, the reaction temperature is 250°C, and the leaching rates of Ni and Co are 97.14% and 96.45% respectively; After high pressure leaching, the concentration of hexavalent chromium is <0.5mg / L.

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 provides a method for removing hexavalent chromium in the process of preparing cobalt nickel hydroxide from laterite-nickel ore. The method comprises the steps that before the high-pressure acid leaching step, laterite-nickel ore pulp is preheated, before the preheating step, a first reducing agent is added into the laterite-nickel ore pulp, and then the laterite-nickel ore pulp added with the first reducing agent is made to enter the high-pressure acid leaching step; wherein the first reducing agent is one or more of pyrite, sulfur and chromite, or organic wastewater; or, a second reducing agent is added into the leachate obtained in the cyclic leaching step, and then the residual ore neutralization step is executed; and the second reducing agent is one or more of sulfite, pyrosulfite, ferrite, thiosulfate, sulfide salt and bisulfite of alkali metal or alkaline-earth metal. By utilizing the method provided by the invention, hexavalent chromium can be removed from the source on the basis of not changing the high-pressure leaching procedure of the laterite-nickel ore, so that the nickel-cobalt hydroxide product is prevented from being carried out, and the original steps are not influenced.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for removing hexavalent chromium in the process of preparing nickel-cobalt hydroxide from laterite nickel ore. Background technique [0002] The preparation of nickel and cobalt hydroxide from laterite nickel ore usually adopts high-pressure acid leaching process, which mainly includes high-pressure acid leaching, circular leaching, residual ore neutralization, pre-neutralization, CCD countercurrent washing, one-stage iron and aluminum removal, two-stage iron and aluminum removal, one-stage Composed of nickel-cobalt immersion, two-stage nickel-cobalt immersion and other processes. Some lateritic nickel ores will produce hexavalent chromium in the high-pressure acid leaching process, and finally produce nickel-cobalt hydroxide products containing hexavalent chromium, and the presence of hexavalent chromium will affect the performance of nickel-cobalt hydroxide products...

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
IPC IPC(8): C01G53/00C01G53/04C22B3/00C22B3/06C22B3/44
CPCC01G53/00C01G53/04C22B3/06C22B3/44C22B23/0415C22B23/0461
Inventor 李勇孙宁磊丁剑刘苏宁林洁媛曹敏彭建华
Owner CHINA ENFI ENGINEERING CORPORATION
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com