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

A kind of calcification-carbonization one-step processing method for Bayer process red mud

A technology of Bayer red mud and step method, which is applied in the production of alumina/hydroxide, cement, etc., can solve the problem of not completely solving the problem of energy consumption in the production process of red mud containing alkali, and achieve the reduction of mine consumption and energy consumption. Consumption and operating costs, the effect of low production energy consumption

Active Publication Date: 2018-03-13
NORTHEASTERN UNIV LIAONING
View PDF8 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned patented technologies are all aimed at energy saving and consumption reduction in the alumina production process and the harmless utilization of red mud, but none of them have achieved the goal of completely solving the alkali content in red mud and greatly reducing the energy consumption in the production process.

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 kind of calcification-carbonization one-step processing method for Bayer process red mud

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The method for processing Bayer process red mud by calcification-carbonization one-step method specifically comprises the following steps:

[0043] Step 1, Calcification Transformation

[0044] (1) Mix Bayer process red mud, lime and clear water to form a mixed slurry with a ratio of liquid volume to solid mass of 2:1; wherein, according to m 1 :m 2 = 0.5;

[0045] (2) Carry out calcification transformation under the condition that the temperature of the mixed pulp is 80°C and the reaction time is 20 minutes;

[0046] In step 1, the main reaction of the calcification transformation process is (1);

[0047] Step 2, carbonization transformation

[0048] (1) In the slurry system formed after calcification transformation, add clear water to adjust the ratio of liquid volume to solid mass in the slurry system to 3:1;

[0049] (2) Into the adjusted pulp system, feed CO 2 Component gas, CO 2 The gas partial pressure is 0.4MPa, and the carbonization transformation is car...

Embodiment 2

[0055] The method for processing Bayer process red mud by calcification-carbonization one-step method specifically comprises the following steps:

[0056] Step 1, Calcification Transformation

[0057] (1) Mix Bayer process red mud, lime and water to form a mixed slurry with a ratio of liquid volume to solid mass of 3:1; wherein, according to m 1 :m 2 = 1;

[0058] (2) Carry out calcification transformation under the condition that the mixed ore pulp is at a temperature of 90°C and a reaction time of 40 minutes;

[0059] In step 1, the main reaction of the calcification transformation process is (1);

[0060] Step 2, carbonization transformation

[0061] (1) In the slurry system formed after calcification transformation, add clear water to adjust the ratio of liquid volume to solid mass in the slurry system to 4:1;

[0062] (2) Into the adjusted pulp system, feed CO 2 Component gas, CO 2 The gas partial pressure is 0.6MPa, and the carbonization transformation is carried ...

Embodiment 3

[0068] The method for processing Bayer process red mud by calcification-carbonization one-step method specifically comprises the following steps:

[0069] Step 1, Calcification Transformation

[0070] (1) The Bayer process red mud, lime and Na 2 Sodium hydroxide solution with O mass concentration ≤ 40g / L is mixed to form a mixed slurry with a ratio of liquid volume to solid mass of 4:1; wherein, according to m 1 :m 2 = 2;

[0071] (2) Carry out calcification transformation under the condition that the temperature of the mixed pulp is 100°C and the reaction time is 60 minutes;

[0072] In step 1, the main reaction of the calcification transformation process is (1);

[0073] Step 2, carbonization transformation

[0074] (1) Add Na to the slurry system formed after calcification transformation 2 O sodium hydroxide solution with mass concentration ≤ 40g / L, adjust the ratio of liquid volume to solid mass in the slurry system to 5:1;

[0075] (2) Into the adjusted pulp system...

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 one-step calcification-carbonization method for treating Bayer process red mud, and belongs to the field of environmental protection. This method first mixes Bayer process red mud, lime and transformation liquid phase, in which the transformation liquid phase is clean water or a solution with Na2O mass concentration ≤ 40g / L, and the mixed slurry is calcified; the transformation slurry is directly processed without solid-liquid separation. Add pressurized gas containing CO2 components to the reaction system to perform the carbonization transformation reaction; the slurry after carbonization transformation is separated from liquid and solid to obtain tailings and liquid phase, and the tailings are extracted with aluminum hydroxide through aluminum-dissolving mother liquor The liquid phase is returned to the Bayer process system as raw material for the cement industry or for soil formation. This technology can achieve alkalinization of red mud and recovery of alumina through a one-step transformation process of calcification-carbonization. It is an energy-saving and environmentally friendly short-process treatment method of Bayer red mud.

Description

Technical field: [0001] The invention relates to the technical field of environmental protection, in particular to a one-step calcification-carbonization method for processing Bayer process red mud. Background technique: [0002] Since 2007, China's aluminum industry has entered a stage of rapid development. In 2014, my country's alumina production capacity reached about 50 million tons, twice that of 2007 (about 7 times that of 2004), and the discharge of red mud also reached 50 million tons. Tons, production capacity and emissions accounted for about 50% of the world. High-alkali red mud is the solid waste with the largest discharge in the aluminum industry. Every ton of alumina produced will produce 1-1.4 tons of red mud. At present, the total stockpiles in my country have reached about 400 million tons. The pH value of Bayer red mud is 11.0-12.0, which is highly corrosive to organisms and metal materials. The alkalinity of red mud attached liquid is as high as 26348mg / L...

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): C01F7/02C04B7/14
CPCC01F7/02C04B7/14Y02P40/10
Inventor 张廷安吕国志刘燕豆志河解立群王艳秀张子木赵秋月张伟光
Owner NORTHEASTERN UNIV LIAONING
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