Red mud modification method

A red mud modification technology, applied in the field of industrial waste residue modification, can solve the problems of affecting red mud soil, affecting the aesthetics of buildings, and high red mud bulk density

Pending Publication Date: 2021-04-09
CHINESE NONFERROUS METAL SURVEY & DESIGN INSTITUE OF CHANGSHA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using red mud as raw material to prepare building materials can reduce the preparation cost, but due to the high salt content in red mud, salts will be precipitated, resulting in "frost" phenomenon, which will not only affect the aesthetics of buildings, but also precipitated salts in After being washed by rainwater, it will flow into the surrounding soil or water body with the rainwater, which will have an adverse impact on the surrounding environment
Valuable metal elements are recovered from red mud, and the recovery rate and leaching rate of organic metals are relatively high. However, due to the complicated extraction process, the extraction of rare metals in red mud is basically done by acid leaching, which is easy to corrode equipment. The consumption of acid is large and the cost is high
[0004] Stacking of red mud, due to its strong alkalinity, high salinity, lack of organic matter and nutrients required by various plants, and high metal toxicity, will affect the soil where the red mud is piled up, so it is not suitable for planting seedlings or sowing in the later stage
The steps of the current red mud improvement method are relatively complicated, and the stability of the modified red mud is not very good, and the bulk density of the modified red mud is still relatively high, which is not conducive to the planting of later vegetation and sustainable development. ecological improvement

Method used

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preparation example Construction

[0037] The mushroom compost can be obtained commercially or prepared. In order to further improve the structural stability of the red mud and increase the microbial activity and species abundance in the red mud, preferably, the preparation method of the mushroom compost comprises:

[0038] (1) mixing straw with livestock and poultry manure and water so that its water content is 40-50% by weight;

[0039] (2) mixing gypsum powder with the mixture obtained in step (1) to obtain base material;

[0040] (3) performing a primary fermentation on the base material to obtain a primary fermentation product;

[0041] (4) performing secondary fermentation on the primary fermentation product to obtain the mushroom compost;

[0042] Wherein, the dry weight ratio of the straw, the livestock manure and the gypsum powder is 1:0.2-2:0.2-2.

[0043] In order to further improve the structural stability of the red mud and increase the microbial activity and bacterial species abundance in the r...

preparation example 1

[0078] (1) Mix 5kg of corn stalks, 2kg of cow dung and 3kg of sheep dung evenly, then pour 8kg of water therein and mix evenly to obtain a mixture;

[0079] (2) Mix 5kg of gypsum-1 with the mixture obtained in step (1) to obtain base material;

[0080] (3) Start the fan so that the wind pressure of the primary fermentation tunnel is 2800Pa, place the base material obtained in step (2) in the primary fermentation tunnel for fermentation, and when the temperature rises above 70°C, keep it for 3 days. During the process, keep the temperature of the base material below 80°C, and then turn the fermentation product once to lower the temperature below 40°C;

[0081] (4) Move the primary fermentation product to the secondary fermentation tunnel for fermentation. When the temperature rises above 55°C, keep it for 10 hours. During this process, keep the temperature of the primary fermentation product below 60°C. After cooling down to below 35°C Decompose for 3 days to get Mushroom Comp...

preparation example 2

[0083] (1) Mix 5kg of corn stalks, 1kg of chicken manure and 1.5kg of sheep manure evenly, then pour 5kg of water therein and mix evenly to obtain a mixture;

[0084] (2) Mix 2.5kg of gypsum-2 with the mixture obtained in step (1) to obtain base material;

[0085] (3) Start the fan so that the wind pressure of the primary fermentation tunnel is 2500Pa, place the base material obtained in step (2) in the primary fermentation tunnel for fermentation, and when the temperature rises above 70°C, keep it for 3 days. During the process, keep the temperature of the base material below 80°C, and then turn the fermentation product once to lower the temperature below 40°C;

[0086] (4) Move the primary fermentation product to the secondary fermentation tunnel for fermentation. When the temperature rises above 55°C, keep it for 8 hours. During this process, keep the temperature of the primary fermentation product below 60°C. After cooling down to below 35°C Decompose for 5 days to get Mu...

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Abstract

The invention relates to the technical field of industrial waste residue modification, and discloses a red mud modification method. The red mud modification method comprises the following steps that (1), a red mud modifier is provided, and the red mud modifier is prepared from acidic organic residues, gypsum and mushroom compost; and (2), the red mud is uniformly mixed with the red mud modifier, standing and aging are carried out. The modified red mud has good structural stability, and the volume weight of the red mud can be effectively reduced.

Description

technical field [0001] The invention relates to the technical field of modification of industrial waste residues, in particular to a red mud modification method. Background technique [0002] Red mud is an insoluble waste residue obtained by extracting alumina from bauxite using the Bayer process. Every ton of alumina produced will produce 1-25 tons of red mud. [0003] At present, there are two ways to deal with red mud: stacking and recycling. Among them, there are three main directions of recycling: preparation of building materials, extraction of valuable metal elements in red mud, and application of them in environmental governance. Using red mud as raw material to prepare building materials can reduce the preparation cost, but due to the high salt content in red mud, salts will be precipitated, resulting in "frost" phenomenon, which will not only affect the aesthetics of buildings, but also precipitated salts in After being washed by rainwater, it will flow into the...

Claims

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Application Information

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IPC IPC(8): A01G24/10A01G24/22A01G24/27A01G24/20C05G1/00C05F17/70
CPCA01G24/10A01G24/22A01G24/27A01G24/20C05D3/02C05F17/70Y02W30/40
Inventor 张嘉超王密曹楚彦彭川罗程
Owner CHINESE NONFERROUS METAL SURVEY & DESIGN INSTITUE OF CHANGSHA
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