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A method of alkaline treatment of high-iron red mud deep dealkalization and iron enrichment

A high-iron red mud and deep dealkalization technology, which is applied in sludge treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problems of high energy consumption, poor economy, and few industrial applications, and achieve reduction The effect of production energy consumption, saving production cost and shortening the process flow

Inactive Publication Date: 2016-10-05
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using the above method to recover iron from high-iron red mud is not difficult technically, but it generally consumes high energy and has poor economic efficiency, so there are few industrial applications

Method used

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  • A method of alkaline treatment of high-iron red mud deep dealkalization and iron enrichment

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Using the method of the present invention to treat high-iron red mud, taking the Bayer process high-iron red mud of a factory in Guangxi as an example, the composition (wt%) of the Bayer process high-iron red mud is as follows:

[0020]

[0021] Its processing steps are:

[0022] Mix the high-iron red mud and NaOH solution with a concentration of 550g / L and put it in the reaction kettle. The mixed product of alkali red mud, after the mixed reaction product is cooled to 100°C, the liquid and solid are separated to obtain crude alkali liquor and dealkalized red mud. After analysis, the content of sodium oxide in the dealkalized red mud is 0.87%, and the content of iron oxide is 43.25%. The crude lye is recycled after desiliconization and purification.

Embodiment 2

[0024] Mix the high-iron red mud with a NaOH solution with a concentration of 700g / L and place it in a reaction kettle. The mixed product of dealkalized red mud, after the mixed reaction product is cooled to 100°C, the liquid and solid are separated to obtain crude lye and dealuminated dealkalized red mud. After analysis, the content of sodium oxide in dealkalized red mud is 0.57%, and the content of iron oxide is 48.7%. The crude lye is recycled after desiliconization and purification.

Embodiment 3

[0026] Mix high-iron red mud with NaOH solution with a concentration of 300g / L and place it in a reaction kettle. The mixed product of alkali red mud, after the mixed reaction product is cooled to 100°C, the liquid and solid are separated to obtain crude alkali liquor and dealkalized red mud. After analysis, the content of sodium oxide in the dealkalized red mud is 1.31%, and the content of iron oxide is 40.77%. The crude lye is purified and recycled after desiliconization.

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Abstract

The invention discloses a method of treating high-iron red mud by alkaline process for deep dealkalization and iron enrichment. The method comprises the following steps: mixing the high-iron red mud with a strong alkali solution of which the concentration is 300-700g / L to perform dissolution treatment under the conditions that the volume and mass ratio of the alkali solution to the high-iron red mud is (4 to 1)-(20 to 1) (ml / g), the dissolution temperature is 200-300 DEG C, and the reaction time is 10-60 minutes; performing liquid-solid separation to obtain a crude alkali solution and dealkalized high-iron red mud after dissolution, and washing dealkalized high-iron red mud slag to obtain iron-enriched slag, wherein the sodium oxide content in the iron-enriched slag is not more than 1%, and the iron oxide content in the iron-enriched slag is more than 40%, thus the iron-enriched slag can be directly used for blast furnace iron-making. The method is relatively low in dissolution temperature and pressure and good in dealkalization effect, and can not generate secondary pollution in the dissolution process.

Description

technical field [0001] The invention relates to a method for treating high-iron red mud by an alkali method to carry out deep dealkalization and recovery of alumina, and at the same time obtain a method for obtaining iron-rich final slag that can be directly used in blast furnace ironmaking. Background technique [0002] Red mud is a solid industrial waste formed when bauxite is leached by strong alkali in the alumina production process, and impurities such as iron and titanium in the ore and most of the silicon are insoluble. For every 1 ton of alumina produced, 1.0-1.8 tons of red mud will be produced. By the end of 2012, the national alumina output will be about 37.7 million tons, and the annual discharge of red mud will be about 50 million tons. The long-term stacking of red mud not only takes up a lot of land, but also consumes a lot of manpower and material resources for the management and maintenance of the yard. Moreover, red mud is an alkaline substance, and the sew...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/00C22B7/00
CPCY02P10/20
Inventor 马淑花丁健王月娇郑诗礼张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI