Comprehensive utilization method for Bayer red mud

A technology of Bayer red mud and red mud, which is applied in the direction of chemical instruments and methods, alkali metal compounds, process efficiency improvement, etc. It can solve the problems affecting the performance of building materials such as cement and limit the application of red mud, and achieve low cost and high purity. high effect

Pending Publication Date: 2020-05-12
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Sodium ions are finally accumulated in red mud due to the formation of desilication products such as nacryptite, cannonite, and sodalite. The existence of which limits the application of red mud in building materials, mainly due to the sodium ions in concrete It will cause the "frost" effect of alkali aggregate, which will affect the performance of building materials such as cement

Method used

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  • Comprehensive utilization method for Bayer red mud

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Effect test

Embodiment 1

[0030] A method for comprehensive utilization of Bayer red mud, mixing Bayer red mud with concentrated sulfuric acid, using sulfuric acid to completely salinize Bayer red mud under low temperature conditions to obtain sulfated red mud; Muffle furnace roasting, roasting time 40min, soak the roasted product in water, water immersion temperature 50°C, time 30min, and then separate solid and liquid to obtain red mud oxidation clinker rich in sodium and low iron and high iron; add sodium carbonate to the leachate , the pH of the solution was adjusted to be 9, and the solution was left to stand for 30 minutes at 50° C., and then the solution was filtered, and the obtained filtrate was evaporated and crystallized to obtain sodium sulfate crystals. The purity of sodium sulfate in this example was 98.4%; the red mud The oxidized clinker and NaOH solution are reacted after mixing in a ratio of 8:1; the reaction temperature is 150°C; the constant temperature time is 120min; the concentrat...

Embodiment 2

[0032] A method for comprehensive utilization of Bayer red mud, mixing Bayer red mud with concentrated sulfuric acid, using sulfuric acid to completely salinize Bayer red mud at low temperature to obtain sulfated red mud; Muffle furnace roasting, roasting time 40min, soak the roasted product in water, water immersion temperature 50°C, time 30min, and then separate solid and liquid to obtain red mud oxidation clinker rich in sodium and low iron and high iron; add sodium carbonate to the leachate , adjust the pH of the solution to be 9, let it stand for 30min under the environment of 50°C, then filter the solution, and evaporate and crystallize the obtained filtrate to obtain sodium sulfate crystals. The purity of sodium sulfate in this example is 98.2%; the red mud The oxidized clinker and NaOH solution are reacted after mixing in a ratio of 8:1; the reaction temperature is 150°C; the constant temperature time is 120min; the concentration of the NaOH solution is 190g / L; Dry and...

Embodiment 3

[0034] A method for comprehensive utilization of Bayer red mud, mixing Bayer red mud with concentrated sulfuric acid, using sulfuric acid to completely salinize Bayer red mud under low temperature conditions to obtain sulfated red mud; Muffle furnace roasting, roasting time 40min, soak the roasted product in water, water immersion temperature 50°C, time 30min, and then separate solid and liquid to obtain red mud oxidation clinker rich in sodium and low iron and high iron; add sodium carbonate to the leachate , adjust the pH of the solution to be 8, let it stand for 30min under the environment of 50°C, then filter the solution, and evaporate and crystallize the obtained filtrate to obtain sodium sulfate crystals. The purity of sodium sulfate in this example is 97.9%; the red mud The oxidized clinker and NaOH solution were mixed in a ratio of 7:1 and then reacted; the reaction temperature was 150°C; the constant temperature time was 120min; the concentration of the NaOH solution ...

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Abstract

The invention provides a comprehensive utilization method for Bayer red mud, belonging to the technical field of metallurgy and chemical engineering. The method comprises the following steps: firstly,mixing the Bayer red mud with concentrated sulfuric acid, and conducting complete salinization under a low-temperature condition to obtain sulfated red mud; then, roasting the prepared sulfated red at a temperature of 600-900 DEG C, subjecting a roasted product to water leaching, and then conducting solid-liquid separation to obtain a sodium-rich low-iron leachate and high-iron red mud oxidized clinker; and finally, adding sodium carbonate into the leachate, carrying out solid-liquid separation, and carrying out evaporative crystallization on a filtrate to obtain sodium sulfate crystals. Thehigh-iron red mud oxidation clinker can be used for extracting aluminum. According to the method, high-purity sodium sulfate can be prepared, and aluminum can be extracted, so the waste is turned intowealth, and harm caused by direct accumulation of the red mud is eliminated.

Description

technical field [0001] The invention relates to the technical field of metallurgy and chemical industry, in particular to a method for comprehensive utilization of Bayer red mud. Background technique [0002] Bayer red mud is the waste produced during the extraction of alumina from bauxite in the Bayer process. It gets its name because it is rich in iron and has a reddish-red mud shape. For every ton of alumina produced, about 1.0 to 2.0 tons of red mud are produced. There are many kinds of valuable elements in Bayer red mud, such as iron, aluminum, sodium, titanium, calcium and rare and precious metal elements. The red mud produced in our country is as high as tens of millions of tons every year, but the utilization rate is very low, resulting in hundreds of millions of tons of red mud piled up. [0003] Red mud contains iron, aluminum, sodium and other valuable metals, and has high comprehensive utilization value. The realization of its comprehensive utilization must b...

Claims

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Application Information

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IPC IPC(8): C01D5/00C22B1/02C22B7/00C22B21/00
CPCC01D5/00C01P2006/80C22B1/02C22B7/001C22B7/006C22B21/0007C22B21/0023Y02P10/20
Inventor 宗燕兵赵成玉刘召波
Owner UNIV OF SCI & TECH BEIJING
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