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Technology for dealkalizing red mud

A red mud and dealkalization technology, applied in sludge treatment, process efficiency improvement, solid waste removal, etc., can solve the problems of cumbersome operation and difficult control of required conditions, and achieves the solution of large-scale stockpiling, efficient dealkalization, The effect of realizing economic value

Active Publication Date: 2021-04-30
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Technology for dealkalizing red mud
  • Technology for dealkalizing red mud
  • Technology for dealkalizing red mud

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The raw material is red mud tailings from an aluminum industry in Shandong, and the mass percentage of the main component in the red mud (average particle size is 5 microns) is SiO 2 : 24.35%, CaO: 43.28%, Al 2 o 3 : 4.45%, K 2 O: 0.46%, Na 2 O: 6.75%, MgO: 0.52%, Fe 2 o 3 : 8.78%.

[0031] (1) Stir and mix red mud, concentrated sulfuric acid and water according to the weight ratio of 50:9:15 to make slurry A, and the concentrated sulfuric acid is sulfuric acid with a concentration of 98% by mass.

[0032] (2) Set the slurry A to stand at a temperature of 30 degrees Celsius for 30 minutes.

[0033] (3) Add the dehydrated water into the slurry A according to the solid-to-liquid ratio of 1:3 to obtain the mixture, continue to stir for 15 minutes, and then carry out suction filtration. The stirring speed is 300 rpm, and the temperature of the mixture is controlled at 30 degrees Celsius during stirring.

[0034] (4) Solid-liquid separation, the liquid phase is used t...

Embodiment 2

[0037] The raw material is the red mud tailings of an aluminum industry in Shandong, and the mass percentage of the main component in the red mud (average particle size is 1 micron) is SiO 2 : 25.75%, CaO: 49.65%, Al 2 o 3 : 6.56%, K 2 O: 0.75%, Na 2 O: 1.24%, MgO: 0.82%, Fe 2 o 3 : 8.79%.

[0038] (1) Stir and mix red mud, concentrated sulfuric acid and deionized water according to the weight ratio of 50:12:15 to prepare slurry A. The concentrated sulfuric acid is sulfuric acid with a concentration of 98% by mass.

[0039] (2) Set the slurry A to stand at a temperature of 40 degrees Celsius for 30 minutes.

[0040] (3) Add deionized water into the slurry A according to the solid-to-liquid ratio of 1:3 to obtain the mixture, continue to stir for 15 minutes and then carry out suction filtration, the stirring speed is 300 rpm, and the temperature of the mixture is controlled at 25 degrees Celsius during stirring.

[0041] (4) Solid-liquid separation, the liquid phase is u...

Embodiment 3

[0044] The raw material is the red mud tailings of an aluminum industry in Shandong, and the mass percentage of the main component in the red mud (average particle size is 1 micron) is SiO 2: 26.4%, CaO: 42.75%, Al 2 o 3 : 7.56%, K 2 O: 0.85%, Na 2 O: 1.32%, MgO: 0.88%, Fe 2 o 3 : 8.49%.

[0045] (1) Stir and mix red mud, concentrated sulfuric acid and deionized water according to the weight ratio of 50:3:15 to make slurry A, and the concentrated sulfuric acid is sulfuric acid with a concentration of 98% by mass.

[0046] (2) Set the slurry A to stand at a temperature of 30 degrees Celsius for 30 minutes.

[0047] (3) Add deionized water into the slurry A according to the solid-to-liquid ratio of 1:3 to obtain a mixture, continue to stir for 15 minutes and then perform suction filtration at a stirring speed of 300 rpm, and control the temperature of the mixture to 30 degrees Celsius during stirring.

[0048] (4) Solid-liquid separation, the liquid phase is used to recov...

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Abstract

The invention discloses a method fordealkalizing red mud by adopting an acid mixing process to treat the red mud at normal temperature. The treatment method comprises the following steps: mixing red mud and concentrated sulfuric acid according to a certain ratio, adding a small amount of deionized water to prepare slurry A, allowing the slurry A to stand at a low temperature of 30-40 DEG C for a period of time, adding deionized water into the obtained solution according to a liquid-solid ratio, and continuously conducting stirring at normal temperature for a period of time to form a solid-liquid mixture; and carrying out suction filtration separation on the obtained solid-liquid mixture, adding a certain amount of deionized water in the suction filtration process for washing, and recovering metals such as sodium, calcium and the like from residues obtained after separation treatment. The method is high in dealkalization efficiency, the dealkalization process is simple and controllable, and meanwhile, the problem that solid and liquid are difficult to efficiently separate is avoided; and necessary conditions are provided for high-value comprehensive application of the red mud.

Description

technical field [0001] The invention relates to a fast and simple dealkalization method for red mud, belonging to the technical field of comprehensive and efficient utilization of solid waste. Background technique [0002] Red mud is a strong alkaline solid waste discharged during the alumina production process. my country's annual red mud discharge is nearly 100 million tons, and the total red mud stockpile exceeds 600 million tons. Due to the characteristics of high heavy metal content, strong alkalinity, and high water content in red mud, the accumulation of a large amount of red mud is harmful to human health and nature. The environment can present hazards. Nowadays, damming and dumping of seawater are commonly used at home and abroad to deal with red mud. Damming and stacking will not only occupy a large amount of land resources, but also heavy metals in red mud will penetrate into the soil and surface water during the stacking process, causing water pollution, Soil sa...

Claims

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Application Information

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IPC IPC(8): C02F11/00C22B7/00C22B3/08C22B26/10C22B26/20B09B3/00B09B5/00
CPCC02F11/00C22B7/007C22B26/10C22B26/20B09B3/00B09B5/00Y02W30/91
Inventor 王丽胡广艳唐鸿鹄韩海生孙伟
Owner CENT SOUTH UNIV
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