Method for separating chromium ions and iron ions in multicomponent solution

A technology of chromium ions and iron ions, applied in the direction of chromium sulfate and the improvement of process efficiency, can solve the problems of long process flow and technical limitations, and achieve the effect of short process flow

Inactive Publication Date: 2011-02-16
NORTHEASTERN UNIV
View PDF2 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the preparation process of chromium salt mostly uses chromite as raw material, adopts calcification roasting process, not only the process is long, but also a large amount of Cr 6+ waste residue, and this waste residue has been listed as the top priority of s...

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 separating chromium ions and iron ions in multicomponent solution
  • Method for separating chromium ions and iron ions in multicomponent solution
  • Method for separating chromium ions and iron ions in multicomponent solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The process of separating chromium ions and iron ions from the multi-component solution is as follows.

[0020] The mixed solution of chromium sulfate and ferric sulfate after sulfuric acid leaching of chromite is used as raw material, and the content of chromium ion is 7% and the content of iron ion is 4% in terms of mass percentage.

[0021] Use the extraction method to remove iron, add an extractant to the mixed solution of chromium sulfate and ferric sulfate for extraction, the extractant is selected from octadecyl dimethyl tertiary amine, and the amount of the extractant added is 30% of the volume of the mixed solution of chromium sulfate and ferric sulfate , the non-organic phase obtained after extraction is a chromium sulfate solution, and the organic phase is obtained as an extractant and iron sulfate, and then the organic phase is back-extracted with a sodium hydroxide solution with a mass concentration of 10%, and the amount of the sodium hydroxide solution con...

Embodiment 2

[0025] The process of separating chromium ions and iron ions from the multi-component solution is as follows.

[0026] The mixed solution of chromium sulfate and ferric sulfate after sulfuric acid leaching of chromite is used as raw material, and the content of chromium ion is 12% and the content of iron ion is 6% in terms of mass percentage.

[0027] Adopt extraction method to remove iron, add extractant to chromium sulfate and ferric sulfate mixed solution to extract, extractant selects octadecyl tertiary amine, the amount of extractant added is 50% of the volume of chromium sulfate and ferric sulfate mixed solution, after extraction Obtaining the non-organic phase is chromium sulfate solution, obtaining the organic phase is extractant and ferric sulfate, and then using a mass concentration of 15% sodium hydroxide solution to back-extract the organic phase, and controlling the addition of sodium hydroxide solution to the volume of the organic phase 3%, adjust the pH value to...

Embodiment 3

[0031] The process of separating chromium ions and iron ions from the multi-component solution is as follows.

[0032] The mixed solution of chromium sulfate and ferric sulfate after sulfuric acid leaching of chromite is used as raw material, and the content of chromium ion is 3% and the content of iron ion is 1% in terms of mass percentage.

[0033] Use extraction method to remove iron, add extractant to the mixed solution of chromium sulfate and ferric sulfate for extraction, the extractant is selected from dioctadecyl tertiary amine, the amount of extractant added is 10% of the volume of the mixed solution of chromium sulfate and ferric sulfate, extract Obtaining the non-organic phase at last is chromium sulfate solution, obtains organic phase and is extraction agent and ferric sulfate, then with the sodium hydroxide solution that mass concentration is 5%, the organic phase is back-extracted, the add-on of control sodium hydroxide solution is organic phase 8% of the volume,...

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 separating chromium ions and iron ions in a multicomponent solution, comprising the following steps of: with a mixed solution of chromic sulfate and ferric sulfate, generated by leaching out chromite by using sulfuric acid, as a raw material, adding an extractant to carry out extraction; obtaining an inorganic phase of a chromic sulfate solution and obtaining organic phases of the extractant and the ferric sulfate after extraction; then carrying out back extraction on the organic phases by using a sodium hydroxide solution and regulating a pH value to be 9-10 to obtain ferric hydroxide, a sodium sulfate solution and an extractant; recycling the extractant, and preparing the chromic sulfate by utilizing the extracted chromic sulfate solution and adopting a direct crystallization method; and preparing iron oxide red pigment by utilizing the ferric hydroxide as a raw material through a high-temperature crystallization method. Compared with the traditional technology for removing iron from the mixed solution of the chromic sulfate and the ferric sulfate, the invention has the most remarkable advantages that a process flow is short without three waste emission and extractant is recycled. Iron oxide red as a by-product does not contain hexavalent chromium and can be applied to industries of buildings, coatings, vehicles and the like.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and relates to the processing technology of chromite, in particular to a method for separating chromium ions and iron ions in a multi-component solution. Background technique [0002] At present, the preparation process of chromium salt mostly uses chromite as raw material, adopts calcification roasting process, not only the process is long, but also a large amount of Cr 6+ waste, and this waste has been listed as the top priority of solid waste management by countries all over the world. However, the process of preparing chromium salt by sulfuric acid method is affected by the separation of chromium and ferric ions in the solution, which limits the technology of preparing chromium salt by sulfuric acid method. The separation techniques of chromium ions and iron ions in the solution are as follows: [0003] (1) Ferrous sulfate crystallization method. Chromium sulfate and ferric sulf...

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): C22B3/28C01G37/08C22B34/32
CPCY02P10/20
Inventor 史培阳刘承军姜茂发
Owner NORTHEASTERN 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
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap