Method for producing iron ore concentrate by using Bayer process red muddy sand

A technology of red mud sand and iron concentrate, applied in the direction of alumina/hydroxide, etc., can solve the problems of low iron recovery rate, complex process flow, high investment and operation costs, etc., to reduce iron content, reduce production costs, and increase market capacity big effect

Active Publication Date: 2010-09-15
GUIZHOU BRANCH CHINA ALUMINUM IND
View PDF3 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a method for producing iron ore concentrate by using Bayer process red mud sand to solve the disadvantages of complex tec

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 producing iron ore concentrate by using Bayer process red muddy sand
  • Method for producing iron ore concentrate by using Bayer process red muddy sand

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] In this embodiment, the total iron content of the red mud sand is 45%. First, the red mud sand is dried, crushed, and ground and graded so that the particle size of the red mud sand after grinding and classification is controlled at 30 microns; After the red mud sand and caustic soda solution are mixed at a mass ratio of 1:3, the dissolution reaction is carried out at 160°C and 0.3Mpa for 0.5 hours, and solid-liquid separation is carried out after the reaction is completed, wherein the content of sodium oxide in the caustic soda solution is 200g / L; finally, use distilled water for the solid obtained after solid-liquid separation, wherein the solid mass ratio of distilled water and solid-liquid separation is 3:1, and wash at 95°C until Na in the washing liquid obtained by washing 2 After the O content is less than 0.3%, wet magnetic separation is carried out under a magnetic field with a magnetic field strength of 7000 gauss to obtain iron concentrate and non-magnetic sl...

Embodiment 2

[0036]In this embodiment, the total iron content of the red mud sand is 47%. First, the red mud sand is dried, crushed, and ground and classified, so that the particle size of the red mud sand after grinding and classification is controlled at 70 microns; After the red mud sand and caustic soda solution are mixed at a mass ratio of 1:5, the dissolution reaction is carried out at 130°C and 0.5Mpa for 2 hours, and solid-liquid separation is carried out after the reaction is completed, wherein the content of sodium oxide in the caustic soda solution is 400g / L; finally, use distilled water for the solid obtained after solid-liquid separation, wherein the mass ratio of distilled water and solid-liquid separation obtained after solid-liquid separation is 5:1, and wash at 70°C until Na in the washing liquid obtained by washing 2 After the O content is less than 0.3%, wet magnetic separation is carried out under a magnetic field with a magnetic field strength of 13000 gauss to obtain ...

Embodiment 3

[0038] In this embodiment, the total iron content of the red mud sand is 50%. First, the red mud sand is dried, crushed, and ground and classified, so that the particle size of the red mud sand after grinding and classification is controlled at 50 microns; After the red mud sand and caustic soda solution are mixed at a mass ratio of 1:4, the dissolution reaction is carried out at 150°C and 0.4Mpa for 1.5 hours, and solid-liquid separation is carried out after the reaction is completed, wherein the content of sodium oxide in the caustic soda solution is 300g / L; finally, use distilled water to obtain the solid after solid-liquid separation, wherein, the mass ratio of distilled water and solid-liquid separation is 4:1, and wash at 80°C until Na in the washing liquid obtained by washing 2 After the O content is less than 0.3%, wet magnetic separation is carried out under a magnetic field with a magnetic field strength of 11000 gauss to obtain iron concentrate and non-magnetic slag...

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 relates to a method for producing an iron ore concentrate by using Bayer process red muddy sand. The method comprises the following steps of: drying, crushing, grinding and grading the red muddy sand; mixing the red muddy sand after grinding and grading with solution of sodium hydrate, then performing dissolution reaction on the mixture, and performing solid-liquid separation after finishing the reaction; and washing a solid obtained after the solid-liquid separation by using distilled water, and then performing wet magnetic separation to prepare the iron ore concentrate. In the method for producing the iron ore concentrate by using the Bayer process red muddy sand, the effective utilization ratio of the iron element can be over 90 percent, the Al2O3 content in the finally prepared iron ore concentrate is reduced to 2.0 percent, and the SiO2 content in the iron ore concentrate is less than 2.0 percent; and the method can realize continuous production of the process, utilize discharged red muddy sand to the utmost extent, promote the product added value, reduce the production cost and protect the environment.

Description

technical field [0001] The invention relates to a production of iron ore concentrate, in particular to a method for producing iron ore concentrate by using Bayer process red mud sand. Background technique [0002] Red mud is the waste produced in the process of extracting alumina from bauxite. It is named for its red mud. With the continuous development of the bauxite industry, the discharge of red mud in my country is more than 15 million tons per year, and with the new production and the increase and transformation of old equipment, the total amount of red mud has an upward trend. Most alumina plants in the world pile up or pour red mud into the deep sea. The storage of red mud not only takes up a lot of land and farmland, but also consumes more yard construction and maintenance costs, and the remaining lye in the red mud can Seep into the ground, causing groundwater pollution. In addition, the dust formed by the red mud in the storage yard is flying everywhere, damaging...

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): C22B21/02C01F7/02C21B13/00
Inventor 高建阳陈玉海刘福刚张爱民郑霞邹继承王国昌宋来峰姚毅
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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