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A method of dealkalizing red mud with flue gas combined with alkaline material

A technology of alkaline materials and red mud, which is applied in the field of comprehensive utilization of resources and can solve problems such as complex processes

Active Publication Date: 2017-02-08
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention deals with dealkalization of red mud, and the alkali content of red mud can be reduced to less than 1%, but the process is complicated, and the intermediate process requires sintering and high-temperature equipment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0015] The first step is to grind and pulverize the red mud. After grinding, the particle size of the red mud is 160 mesh. Mix it with water. The weight ratio of the Bayer process red mud to water is 1:3. Add alkaline material calcium carbide slag / lime to react. CaO in active materials and Na in red mud 2 The mass ratio of O is 5%, the reaction temperature is 60°C, and the time is 1h to obtain a solid-liquid mixture ①; the second step is to pass flue gas / simulated flue gas into the first step solid-liquid mixture ① for acidification reaction, and pass Into CO 2 The flow rate is 0.8L / min, SO 2 The flow rate is 60mL / min, the reaction temperature is 80°C, and the time is 2h; the solid-liquid mixture ② is obtained; the third step, the solid-liquid mixture ② obtained after the second step treatment is separated by suction filtration, and the residue after separation is used for recovery Aluminum, iron or mass are used for building materials. The alkali content in the low-alkali ...

example 2

[0017] The first step is to grind and pulverize the red mud. After grinding, the particle size of the red mud is 180 mesh, and mix it with water. The weight ratio of the Bayer process red mud to water is 1:5. Add alkaline material calcium carbide slag / lime to react. CaO in active materials and Na in red mud 2 The mass ratio of O is 10%, the reaction temperature is 80°C, and the time is 1h to obtain a solid-liquid mixture ①; the second step is to pass flue gas / simulated flue gas into the first step solid-liquid mixture ① for acidification reaction, and pass Into CO 2 The flow rate is 0.6L / min, SO 2 The flow rate is 40mL / min, the reaction temperature is 60°C, and the time is 1h; the solid-liquid mixture ② is obtained; the third step, the solid-liquid mixture ② obtained after the second step treatment is separated by suction filtration, and the residue after separation is used for recovery Aluminum, iron or mass are used for building materials. The alkali content in the low-al...

example 3

[0019] The first step is to grind and pulverize the red mud. After grinding, the particle size of the red mud is 180 mesh, and mix it with water. The weight ratio of the Bayer process red mud to water is 1:7. CaO in active materials and Na in red mud 2 The mass ratio of O is 12%, the reaction temperature is 100°C, and the time is 1h to obtain a solid-liquid mixture ①; the second step is to pass flue gas / simulated flue gas into the first step solid-liquid mixture ① for acidification reaction, and pass Into CO 2 The flow rate is 0.4L / min, SO 2 The flow rate is 40mL / min, the reaction temperature is 70°C, and the time is 2h; the solid-liquid mixture ② is obtained; the third step, the solid-liquid mixture ② obtained after the second step treatment is separated by suction filtration, and the residue after separation is used for recovery Aluminum, iron or mass are used for building materials. The alkali content in the low-alkali red mud was detected by conventional methods, and th...

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Abstract

The invention discloses a method for dealkalizing red mud by uniting smoke and a basic material. The processing method comprises the following steps: grinding and smashing bayer's process red mud, wherein the particle size of the smashed red mud is 160-200 meshes; mixing the red mud and water to form a solid-liquid mixture, wherein the weight proportion of the red mud to the water is (1:3) to (1:10); adding a certain proportion of basic material (acetylene sludge or lime) to react, wherein the reaction temperature is 60 DEG C-100 DEG C and the time is 1-2h; introducing the smoke / simulated smoke to the solid-liquid mixture for acidizing reaction after reaction, wherein the flow of the introduced CO2 is 0.2-1L / min, the flow of SO2 is 20-60mL / min, the reaction time is 60 DEG-80 DEG C, and the time is 1-2h; and carrying out suction filtration on the obtained solid-liquid mixture to separate after the reaction is completed. Separated and processed residual can be used for recycling aluminum and iron and used as a building material with a large scale, the situation that scumming is generated by application of non-dealkalized red mud is solved, and the method provides a solving way for wide application of red mud in building material prospect.

Description

technical field [0001] The invention relates to a treatment method for dealkalization of red mud, which belongs to the technical field of comprehensive utilization of resources. Background technique [0002] my country is a big producer of alumina, and the Bayer process red mud is the waste in the process of aluminum production according to the Bayer process route. At present, the comprehensive utilization rate of red mud in my country is relatively low. As my country's alumina production increases year by year and the grade of bauxite gradually decreases, the stockpiles of red mud will continue to increase. Most of the alumina factories at home and abroad transport the red mud to the storage yard, and build a dam for wet storage, which causes soil alkalization, swamping, and pollutes surface and groundwater sources; another common method is to dry and dehydrate the red mud and dry it after evaporation. Stockpile, and still need to occupy land, and at the same time there i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/00
CPCC02F11/00
Inventor 张以河王新珂吕凤柱陆荣荣胡攀蒋绍宾
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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