Method for dealkalizing red mud and co-producing sodium salt

A technology of sodium salt and red mud, applied in the directions of alkali metal carbonate, chemical instruments and methods, alkali metal sulfite/sulfite, etc., can solve the problems of complicated operation and difficult control of required conditions, and achieve simple operation. , equipment requirements and reaction conditions require low and high dealkalization efficiency

Pending Publication Date: 2022-05-13
WUHAN UNIV OF TECH
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  • Abstract
  • Description
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Problems solved by technology

However, wet carbonization requires high pressure and has strict requirements on leaching equipment, the conditions are difficult to control, and the operation is cumbersome

Method used

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  • Method for dealkalizing red mud and co-producing sodium salt

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] 1kg red mud powder (of which Na 2 The mass of O is 10%, the particle size is 0.5~200 μm) and 0.1L water are mixed, stirred for 30min, obtains the red mud slurry, at 20 ℃, is passed into the sulfur dioxide of 40L / kg red mud in the described red mud slurry until The pH value of the red mud slurry is 9-10, acidification treatment is carried out for 0.5h, and the stratification is carried out for 12h, and the solid-liquid separation is carried out to obtain the sodium salt solution, and the sodium salt solution is cooled to 0°C to precipitate the sodium salt crystallization Liquid separation, joint production to obtain sodium salt.

Embodiment 2

[0047] The difference from Embodiment 1 is that the red mud slurry is obtained by mixing 1 kg of red mud powder and 10 L of water, and the rest of the content is consistent with that of Embodiment 1.

Embodiment 3

[0049] The difference from Embodiment 1 is that sulfur dioxide is introduced into the red mud slurry for acidification treatment until the pH value of the red mud slurry is 5-6, and the rest of the content is consistent with that of Embodiment 1.

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Abstract

The invention belongs to the technical field of hazardous waste treatment, and particularly relates to a method for dealkalizing red mud and co-producing sodium salt. According to the method, acid gas and free alkali and chemical binding alkali in the red mud are subjected to an acid-base neutralization reaction to generate sodium salt, a sodium salt solution is obtained through solid-liquid separation, then sodium salt is crystallized and separated out, sodium salt is co-produced, and therefore sodium alkali in the red mud is recycled. In the acid-base neutralization process, not only is free alkali in the red mud slurry reacted with the acid gas to generate sodium salt, but also relatively stable chemical binding alkali in the red mud reacts with the acid gas to generate sodium salt, so that the dealkalization efficiency is relatively high. And the acidity of the acidic gas is weaker than that of the strong acid, so that other metal elements (such as iron, titanium, vanadium and zirconium) in the red mud cannot be dissolved out in the acid treatment process, and a sodium salt solution is prevented from being polluted, so that the influence on the recycling of sodium salt is avoided.

Description

technical field [0001] The invention belongs to the technical field of hazardous waste treatment, and in particular relates to a method for dealkalization and co-production of sodium salt from red mud. Background technique [0002] Red mud is an industrial solid waste discharged from the aluminum industry when it extracts alumina. There are three main aluminum smelting processes: Bayer process, sintering process and combined process. Because the Bayer process has lower requirements on raw ore quality, more than 90% of the aluminum smelting processes are Bayer process. Bayer red mud is formed by filtering and separating the components in bauxite that are not dissolved by NaOH solution, and then washed; sintering red mud is sintering bauxite with soda ash and using dilute alkali to dissolve and extract the clinker Obtained from alumina, the anhydrous sodium aluminate formed during the sintering process has a higher solubility, which can extract alumina and recover alkali to a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/06C01D5/00C01D7/02C01D7/00
CPCC01D5/06C01D5/00C01D7/02C01D7/00
Inventor 王发洲张秀贞刘志超
Owner WUHAN UNIV OF TECH
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