Unlock instant, AI-driven research and patent intelligence for your innovation.

A method for iron strengthening red mud dealkalization and separating and recovering iron

A technology for separation and recovery of red mud, which is applied in the field of comprehensive utilization of resources to achieve high desulfurization efficiency, low energy consumption, and improved dealkalization capacity.

Active Publication Date: 2020-11-20
KUNMING UNIV OF SCI & TECH
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no method to use iron to strengthen red mud dealkalization and recover iron. Therefore, it is necessary to develop a technology to strengthen red mud dealkalization and flue gas desulfurization for comprehensive utilization of flue gas desulfurization and red mud.

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 iron strengthening red mud dealkalization and separating and recovering iron

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Grind and pulverize the red mud, the grinding particle size is 150 mesh, and then put it in the red mud pre-soaking tank and add water to make slurry. The liquid-solid ratio of red mud and water in the red mud pre-soaking tank is 2:1. The temperature in the medium is 40°C; then pass through the sulfur dioxide containing the initial concentration of 3000mg / m 3 At the same time, the red mud slurry in the red mud prepreg tank is aerated and oxidized, in which the aerated oxygen and the introduced SO 2 The volume ratio is 1: 3, and the 2 The flow rate of the flue gas is: 40mL / min; after the pre-soaking of the red mud mixture is completed, filter to obtain the leaching solution and the red mud leaching residue after dealkalization, take the leaching solution and adjust its pH to 12, at this time Fe(OH) 3 Precipitation filtration; Fe(OH) obtained by filtration 3 Precipitation, 1 / 3 Fe(OH) 3 The precipitate is washed 5 times with distilled water and returned to the red mud ...

Embodiment 2

[0048] Grind and pulverize the red mud, the grinding particle size is 200 mesh, and then put it in the red mud presoak tank and add water to make slurry. The liquid-solid ratio of red mud and water in the red mud presoak tank is 3:1, and control the The temperature in the medium is 50°C; then pass through the sulfur dioxide containing the initial concentration of 3000mg / m 3 At the same time, the red mud slurry in the red mud prepreg tank is aerated and oxidized, in which the aerated oxygen and the introduced SO 2 The volume ratio is 1: 5, and the SO 2 The flow rate is: 40mL / min; after the red mud mixture is pre-soaked, filter to obtain the leaching solution and red mud leaching residue after dealkalization, take the leaching solution and adjust its pH to 13, at this time Fe(OH) 3 Precipitation filtration; Fe(OH) obtained by filtration 3 Precipitation, 1 / 3 Fe(OH) 3 The precipitate is washed 7 times with distilled water and returned to the red mud presoak tank in step (1) fo...

Embodiment 3

[0050] Grind and pulverize the red mud, the grinding particle size is 230 mesh, and then put it in the red mud pre-soaking tank and add water to slurry. The liquid-solid ratio of red mud and water in the red mud pre-soaking tank is 4:1. The temperature in the medium is 60°C; then pass through the sulfur dioxide containing the initial concentration of 2500mg / m 3 At the same time, the red mud slurry in the red mud prepreg tank is aerated and oxidized, in which the aerated oxygen and the introduced SO 2 The volume ratio is 1: 7, and the SO 2 The flow rate is: 40mL / min; after the red mud mixture is pre-soaked, filter to obtain the leaching solution and red mud leaching residue after dealkalization, take the leaching solution and adjust its pH to 13, at this time Fe(OH) 3 Precipitation filtration; Fe(OH) obtained by filtration 3 Precipitation, 1 / 3 Fe(OH) 3 The precipitate is washed with distilled water for 9 times and returned to the red mud presoak tank in step (1) for red mud...

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 discloses a method for iron-reinforced red mud dealkalization and iron separating and recovering. According to the method, red mud is firstly grinded and smashed and then placed in a redmud pre-dip tank, a certain amount of water is imported into the red mud pre-dip tank, an excessive amount of SO2 is imported, and aeration and oxidization are carried out on the red mud pre-dip tank; after the pre-dip of the red mud mixed liquor is finished, the red mud mixed liquor is filtered to obtain leachate and alkali removed red mud residue, the leachate is taken, the pH of the leachate is adjusted in a certain alkaline environment, and at the time, Fe(OH)3 can be precipitated and filtered; and a part of the Fe(OH)3 precipitate obtained by filtration is washed with distilled water andthen added to the red mud pre-dip tank for red mud dealkalization strengthening, and the residual Fe(OH)3 precipitate can be recovered to obtain Fe metal. The method can realize the desulfurization and the comprehensive utilization of red mud at the same time, and has the characteristics of being simple in treatment process, high in desulfurization efficiency, complete in red mud dealkalization and low in energy consumption.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of resources, and in particular relates to a method for iron-strengthening red mud dealkalization and separating and recovering iron. Background technique [0002] my country is rich in bauxite resources and the alumina industry is well developed. In recent years, while the alumina industry has continuously brought economic benefits to the society, it has also brought some problems to our environment. in. Every time 1 ton of alumina is produced, 1.0 to 2.0 tons of red mud will be produced. The alkali content in the red mud is relatively high, the pH value is 10.29-11.83, and the pH value of the leachate is 12.1-13.0, so the red mud belongs to strong alkaline soil. Due to the high alkalinity of red mud, on the one hand, its discharge will cause great pollution to the environment, such as polluting underground plants, marine organisms, the atmosphere, etc. On the other hand, its...

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): C22B1/00C22B3/44C21B15/00B01D53/50B01D53/80
CPCB01D53/50B01D53/80B01D2251/102B01D2251/602B01D2258/0283C21B15/00C22B1/005C22B3/44Y02P10/20
Inventor 黄建洪宁平田森林陈珊
Owner KUNMING UNIV OF SCI & TECH