Red mud-based ferrate mixture soil remediation agent and its preparation method and application

A soil remediation agent and ferrate technology, which is applied in the field of soil remediation agent preparation, can solve the problems of rising construction costs, alumina production costs, environmental pollution, waste of resources, etc., so as to save iron resources, reduce alkaline environmental pollution, increase The effect of efficiency

Active Publication Date: 2022-02-01
SHANDONG UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

In 2010, the annual output of red mud in my country was about 30 million tons. As of 2015, the cumulative accumulation of red mud has reached 350 million tons, causing great environmental pollution and waste of resources.
A huge amount of red mud is mainly stored in the open air, which takes up a lot of land
In addition, the construction cost and maintenance cost of red mud storage yard also cause the increase of alumina production cost

Method used

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  • Red mud-based ferrate mixture soil remediation agent and its preparation method and application
  • Red mud-based ferrate mixture soil remediation agent and its preparation method and application

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preparation example Construction

[0026] In a first aspect, the present invention provides a method for preparing a red mud-based ferrate mixture soil remediation agent, comprising the steps of:

[0027] Mix and grind the dried red mud and alkali metal peroxide in proportion;

[0028] The mixed solid powder is calcined to prepare the red mud-based ferrate mixture soil repair agent.

[0029] In the aluminum industry, the red mud, the waste discharged after extracting alumina from bauxite, contains about 10% of valuable iron elements, and most of its occurrence forms are Fe 2 o 3 , a small amount of FeO is present. Fe contained in red mud 2 o 3 As a raw material, it is mixed with an alkali metal peroxide and calcined to obtain a red mud-based ferrate mixture soil remediation agent through a thermochemical oxidation method.

[0030] The reaction mechanism is: red mud (Fe 2 o 3 )+Na 2 o 2 →Na 2 FeO 4 +Na 2 O.

[0031] In some embodiments, the moisture content of the dried red mud is less than 0.1%.

...

Embodiment 1

[0049] Take by weighing 8.992g of the waste red mud of the aluminum making industry, put it into a tube furnace and close it, and feed it into a flow rate of 100ml / min. 2 Dry at 180°C for 1 hour, quickly weigh 8.679g after cooling, and quickly weigh 8.690g according to the mass ratio of 1:1 (considering the loss caused by the transfer process) Na 2 o 2 Mix it with the dried red mud, stir and grind it fully so that there are no obvious lumps in the mixture, quickly put it into the tube furnace and close it, and pass in O at a flow rate of 200ml / min. 2 The temperature was raised to 700° C. at a rate of 6° C. / min and then calcined for 1 hour. After the reaction was completed, the product was taken out after the tube furnace was cooled to room temperature, sealed and stored, and a small amount of product was taken to analyze its phase composition by XRD. The results were as follows: figure 2 As shown, the curves from bottom to top are the XRD patterns of the red mud, the produc...

Embodiment 2

[0051] Compared with Example 1, the heating rate of calcination was 5° C. / min, and the others were the same as Example 1. Ferrate (Na 2 FeO 3 and Na 4 FeO 5 ) content is about 7.7%, of which Na 4 FeO 5 The content is about 3.5%.

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Abstract

The invention discloses a red mud-based ferrate mixture soil repair agent and its preparation method and application. The preparation method comprises the following steps: mixing and grinding the dried red mud and alkali metal peroxide in proportion; mixing the mixed The uniform solid powder is calcined to prepare the red mud-based ferrate mixture soil restoration agent. Combining the characteristics of ferrate and red mud, using red mud as raw material and adding alkali metal oxides, the iron oxide contained in it is converted into ferrate with strong oxidizing properties through the thermochemical oxidation of ferrate. A red mud-based ferrate mixture soil remediation agent is prepared, which can achieve good soil remediation and improvement effects when used for soil improvement and remediation.

Description

technical field [0001] The invention belongs to the technical field of preparation of soil remediation agents, in particular to a red mud-based ferrate mixture soil remediation agent and its preparation method and application, in particular to a method of extracting alumina from bauxite in the aluminum industry and then discharging it The waste red mud is used as a raw material, and the red mud-based ferrate mixture soil remediation agent is prepared by a thermochemical oxidation method. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] At present, the soil pollution situation in my country is not optimistic. The soil pollution of cultivated land is serious, and the rate of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/02B09C1/08A01B79/02C01G49/00C09K109/00
CPCC09K17/02B09C1/08A01B79/02C01G49/0081C01G49/0027C09K2109/00B09C2101/00
Inventor 赵希强周兴王文龙宋占龙孙静毛岩鹏
Owner SHANDONG UNIV
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