Supercharge Your Innovation With Domain-Expert AI Agents!

Method for removing sodium from red mud generated in aluminum oxide industry

A technology of alumina and red mud, which is applied in the fields of alumina/hydroxide, climate sustainability, and sustainable waste treatment. It can solve the problems of poor red mud filtration performance, reduce equipment material requirements, and eliminate environmental pollution. , The effect of reducing the requirements for equipment materials

Inactive Publication Date: 2011-09-21
INST OF PROCESS ENG CHINESE ACAD OF SCI
View PDF2 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The salt method has a high sodium removal rate, but the red mud filtration performance is poor

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 sodium from red mud generated in aluminum oxide industry
  • Method for removing sodium from red mud generated in aluminum oxide industry
  • Method for removing sodium from red mud generated in aluminum oxide industry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] See figure 2 , the device is a schematic diagram of the main reaction device for ammonium chloride pressurized leaching to remove sodium in the red mud produced by the alumina industry. Disassembled, fastened by bolts, airtight can withstand pressure up to 10MPa).

[0042] On the outside of the lid of the electric heating pressure reaction kettle 7, a pressure gauge 9 is installed to show the pressure in the kettle; a thermocouple inserted into the bottom of the electric heating pressure reaction kettle to control the temperature in the electric heating pressure reaction kettle 11. It is connected to the program temperature controller 12 connected to the power supply outside the electric heating pressure reactor; a stirring blade 8 is arranged at the center of the inner bottom of the electric heating pressure reactor, and the stirring blade is connected to the electric heating pressure reactor. The magnetic stirrer 10 on the outside of the reactor cover is connected, ...

Embodiment 2

[0052] Adopt the method and device of embodiment 1, just different reaction conditions are:

[0053] Ratio of materials: Weigh 100g of red mud (broken and finely passed through a 100-mesh sieve, the composition is shown in Table 1), weigh 210g of ammonium chloride, and measure 490ml of deionized water.

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 removing sodium from red mud generated in aluminum oxide industry, particularly a method in which strong acid ammonium salt (ammonium chloride) is used to substitute a strong acid (hydrochloric acid) for removing sodium from red mud generated in aluminum oxide industry. In the invention aiming to treat high-base red mud generated in aluminum oxide industry, strong basicity of the red mud is used to decompose ammonium chloride and release ammonia gas, and sodium element, calcium element, magnesium element and the like in the red mud are converted into soluble chlorides so as to separate from a final residue of the red mud; sodium element and magnesium element in the final residue meet the requirement of a cement additive, thereby utilizing the red mud and eliminating environmental pollution; under the action of ammonia gas released and decomposed from ammonium chloride and added carbon dioxide, magnesium and calcium chlorides generate magnesium hydroxide precipitate and calcium carbonate precipitate, and sodium chloride is converted into low-solubility sodium bicarbonate; after being separated from ammonium chloride, the low-solubility sodium bicarbonate is causticized to return to aluminum oxide production process to be recycled, thus immobilizing carbon dioxide and circularly regenerating ammonium chloride.

Description

technical field [0001] The invention relates to a method for removing sodium from red mud produced by alumina industry, in particular to a method for removing sodium from red mud produced by alumina industry by using strong acid ammonium salt (ammonium chloride) instead of strong acid (hydrochloric acid). technical background [0002] Red mud is the iron-containing solid waste discharged during the alumina smelting process. With the development of the alumina aluminum industry and the decline in ore grades, the amount of red mud is increasing. At present, my country discharges about 20 million tons of red mud every year. Whether Bayer method, sintering method or combined method is adopted, the alkali content in red mud is high (generally higher than 2.5%), because of the excessive sodium content, the utilization rate is low, the red mud is desodiumized, and the waste is turned into treasure. turned into real social problems. A large amount of red mud is piled up in the open...

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): C01F7/02C04B18/12
CPCY02W30/91
Inventor 王云山杨刚张金平
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com