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Method of preparing iron and aluminum flocculant by treating red mud by using coupling external field

A flocculant and red mud technology, applied in water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve problems such as reduced resource utilization efficiency, achieve uniform refinement of reaction, improve performance, Simple operation effect

Inactive Publication Date: 2017-09-08
UNIV OF SCI & TECH LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In almost all production processes, a certain amount of pure reagents such as calcium aluminate or hydrochloric acid must be added for reconciliation, resulting in a further reduction in resource utilization efficiency

Method used

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  • Method of preparing iron and aluminum flocculant by treating red mud by using coupling external field
  • Method of preparing iron and aluminum flocculant by treating red mud by using coupling external field
  • Method of preparing iron and aluminum flocculant by treating red mud by using coupling external field

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] In this example, a high-iron red mud and a common coal were used to prepare the polyaluminum ferric chloride flocculant. The chemical composition of the high-iron red mud is shown in Table 1, and the chemical composition of the coal is shown in Table 2. (The composition TFe in Table 1 represents the total iron content, and the conversion is not included in the total amount, while substances such as P and S exist in the phase of the oxide in the form of oxides).

[0036] Table 1 Chemical composition of high-iron red mud (wt / %)

[0037]

[0038] Chemical composition of table 2 coal (wt / %)

[0039]

[0040] The specific operation steps and methods of the preparation process are as follows:

[0041] (1) The red mud raw material is dried and crushed into a powder of less than 1 mm, and the coal selected as a carbon blending agent is also dried and ground to a size of less than 0.1 mm.

[0042] (2) The red mud and coal powder processed in the step (1) are proportioned...

Embodiment 2

[0055] In this example, a low-iron red mud and a common coal were used to prepare polyaluminum ferric chloride flocculant. The chemical composition of low-iron red mud is shown in Table 5, and the chemical composition of coal is shown in Table 6. (The composition TFe in Table 5 represents the total iron content, and the conversion is not included in the total amount, and substances such as P and S exist in the phase of the oxide in the form of oxides).

[0056] Table 5 Chemical composition of low-iron red mud (wt / %)

[0057]

[0058] The specific operation steps and methods of the preparation process are as follows:

[0059] (1) The red mud raw material is dried and crushed into a powder of less than 1 mm, and the coal selected as a carbon blending agent is also dried and ground to a size of less than 0.1 mm.

[0060] (2) The red mud and coal powder processed in the step (1) are mixed with the ratio of adding 86.5 grams of the coal powder per kilogram of red mud (the carbo...

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Abstract

The invention provides a method of preparing an iron and aluminum flocculant by treating red mud by using a coupling external field. Red mud is treated by means of a two-step method, so that industrial waste hydrochloric acid is used for acid leaching to prepare the iron and aluminum flocculant. The red mud is treated in an early stage by microwave carbon thermal reduction, so that excessive iron in the red mud can be effectively extracted from a carbon thermal reduction-magnetic separation process, and the enriched iron oxide can be also used as iron ore concentrate which enters an iron-making step for smelting pig iron. As the iron content in the residual red mud is reduced, the dissolution rate of aluminum is favorably increased; in the acid leaching process, ultrasonic external field treatment is adopted, so that the iron and aluminum dissolution rate and the reaction effect of the red mud are further enhanced.

Description

technical field [0001] The invention relates to the field of comprehensive utilization of metallurgical resources, in particular to a method for preparing an iron-aluminum flocculant by using coupled external field treatment of red mud. Background technique [0002] Red mud is a by-product in the process of smelting alumina, and its annual output is also increasing with the increase in alumina production. In 2016, the cumulative stockpiling of red mud reached 350 million tons. At present, the comprehensive utilization rate of red mud is less than 20%, and the main utilization methods are mostly low value-added products such as cement, road base materials and various unburned bricks. The rest of the large amount of red mud is piled up by various enterprises because there is no effective large-scale industrialized treatment method. When it cannot be utilized, it also causes huge pollution to the environment. Therefore, it is imminent to find a new industrial treatment metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52
CPCC02F1/5236
Inventor 张军红田晨胡国健何志军庞清海湛文龙
Owner UNIV OF SCI & TECH LIAONING
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