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Red mud slurrying multistage circulating dealkalization method

A technology of red mud and slurry, applied in chemical instruments and methods, inorganic chemistry, cement production, etc., can solve the problems of land occupation, low cost, environmental pollution, etc., save soil resources, save implementation costs, and solve environmental pollution and the effects of land occupation

Inactive Publication Date: 2011-09-07
TIANJIN URBAN CONSTR COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The dealkalized red mud can be recycled and utilized. This method can solve the environmental pollution and land occupation problems caused by the red mud, and realize the comprehensive utilization of the red mud with low cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The red mud is pre-homogenized by the stacking method at the end of the rectangular raw material field; the alkali content of the red mud is 4.23%, and 207 kg of wet red mud is put in a container, and the solid content is 44%; 1 kg of carboxylic acid superplasticizer and 1 kg of expanded perlite, stir and mix evenly, add water until the ratio of solid matter to water in the slurry is 44:56, continue to stir evenly, and wet grind quickly and lightly for 5 minutes to obtain the material slurry, keep the temperature of the slurry at 60°C and age for 10 minutes. Dry and separate with a vacuum dryer, and collect the separated filtrate in an enamel tank. The red mud separated by drying was determined to have an alkali content of 2.85%, a water content of 10%, and a mass of 94 kg.

[0030] The separated red mud was mixed with 6.51 kg of CaO, 0.93 kg of polycarboxylate superplasticizer and 0.93 kg of expanded perlite, and the above-mentioned processes of slurry preparation, ag...

Embodiment 2

[0035] The wet red mud after pre-homogenization was taken, and the measured solid content was 56.3%, and the alkali content was 4.23%. According to the mass fraction, take 90% red mud, 8% CaO, 1.2% polycarboxylate superplasticizer, and 0.8% expanded perlite, and mix them evenly; add water until the ratio of solid matter to water in the slurry is 56.3: 43.7; The temperature of the slurry is controlled at 70°C and aged for 10 minutes. Red mud quality is calculated by solid content.

[0036] When extracting the sodium bicarbonate in the filtrate, keep the filtrate temperature at 70°C.

[0037] The rest of the operations are the same as in Example 1, and the red mud alkali content after three-stage separation is 1.46%.

Embodiment 3

[0039] The wet red mud after pre-homogenization was taken, and the measured solid content was 59.5%, and the alkali content was 4.23%. Take 85% of red mud, 12.5% ​​of CaO, 1.7% of polycarboxylate superplasticizer, and 0.8% of expanded perlite according to the mass fraction, stir and mix evenly; add water until the ratio of solid matter to water in the slurry is 59.5: 41.5. Red mud quality is calculated by solid content.

[0040] The slurry temperature was controlled at 80°C and aged for 10 minutes.

[0041] When extracting the sodium bicarbonate in the filtrate, keep the filtrate temperature at 80°C.

[0042] The rest of the operations are the same as in Example 1, and the red mud alkali content after three-stage separation is 1.23%.

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Abstract

The invention discloses a red mud slurrying multistage circulating dealkalization method which comprises the following steps: dealkalizating by slurrying red mud, filtering the red mud slurry to separate alkali, recovering the alkali from the dealkalization solution, and the like. The invention effectively treats the solid waste red mud discharged in alumina industry, and implements comprehensiveutilization; and since no three wastes are discharged, the method does not generate secondary environmental pollution and has the advantages of simple technique and low cost.

Description

technical field [0001] The invention relates to a treatment method for red mud, which is industrial waste residue discharged from the alumina industry, and in particular to a combined treatment method for red mud pulping, multistage circulation dealkalization and alkali recovery. Background technique [0002] In recent years, my country's alumina industry has grown rapidly. In 2010, my country's alumina output may reach 30 million t / a. With the rapid development of alumina industry, the problem brought about is the treatment of tailings; red mud is a kind of red muddy waste, the main component is SiO 2 , CaO, Fe 2 o 3 、Al 2 o 3 、Na 2 O, TiO 2 、K 2 O, etc., also contain trace amounts of non-ferrous metals. The harm of red mud to the environment is mainly concentrated in that it contains a large amount of strong alkaline chemical substances, which makes it impossible to use large-scale resources. After being diluted 10 times, the pH value is still 11.25-11.50. The ext...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B09B5/00C04B7/14C01D7/00
CPCY02P40/10
Inventor 杨久俊罗忠涛张磊李建伟严亮周爱华
Owner TIANJIN URBAN CONSTR COLLEGE
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