Method for promoting formation of Bayer-process red mud macro aggregates

A Bayer process red mud, body shape technology, applied in chemical instruments and methods, fertilizers made from biological waste, preparation of organic fertilizers, etc., can solve problems such as environmental pollution of Bayer process red mud heaps, and accelerate the formation of large aggregates , raw materials and methods are simple and easy to realize, and the effect of solving pollution

Active Publication Date: 2018-05-11
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The object of the present invention is to provide a method to promote the formation of large aggregates of Bayer proc

Method used

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  • Method for promoting formation of Bayer-process red mud macro aggregates
  • Method for promoting formation of Bayer-process red mud macro aggregates
  • Method for promoting formation of Bayer-process red mud macro aggregates

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1) Preparation of vermicompost

[0030] Mix the materials cow dung, straw, garden soil and sawdust according to the mass percentage of 60:15:10:10, adjust the carbon-nitrogen ratio to 2:3, add water, adjust the moisture content of the material to 50%, and carry out the Heap rot without compaction, and cover the surface of the material with straw, and then cover it with plastic sheeting to prevent dryness and moisture; when the temperature of the material heap rises by 60°C, turn the heap, and bury the surrounding unfermented materials into the heap , turn the pile once every 4 days, and turn the pile 4 times in total to make the material fully fermented, then rinse the material with tap water, adjust the pH of the material to 6.5 and separate the black water at the bottom of the material to obtain feed.

[0031] The feed was put into a three-dimensional breeding box, and earthworms were evenly put into the feed according to the mass ratio of earthworms and feed of 1:40,...

Embodiment 2

[0054] 1) Preparation of vermicompost

[0055] Mix the materials cow dung, straw, garden soil and sawdust according to the mass percentage of 62:10:7:5, adjust the carbon-nitrogen ratio to 2:3, add water, adjust the moisture content of the material to 65%, and carry out the Heap rot without compaction, and cover the surface of the material with straw, and then cover it with plastic sheeting to prevent dryness and moisture; when the temperature of the material heap rises by 50°C, turn the heap, and bury the surrounding unfermented materials into the heap , turn the pile once every 6 days, and turn the pile 3 times in total to make the material fully ferment, then rinse the material with tap water, adjust the pH of the material to 7.5 and separate the black water at the bottom of the material to obtain feed.

[0056] Put the feed into a three-dimensional breeding box, put earthworms evenly into the feed according to the mass ratio of earthworms and feed to 1:120, and cultivate t...

Embodiment 3

[0062] 1) Preparation of vermicompost

[0063] Mix the materials cow dung, straw, garden soil and sawdust according to the mass percentage of 60:12:5:7, adjust the carbon-nitrogen ratio to 2:3, add water, adjust the moisture content of the material to 45%, and carry out the Heap rot without compaction, and cover the surface of the material with straw, and then cover it with plastic cloth to prevent dryness and moisture; when the temperature of the material heap rises by 70°C, turn the heap, and bury the surrounding unfermented materials into the heap , turn the pile once every 5 days, and turn the pile 5 times in total to make the material fully fermented, then rinse the material with tap water, adjust the pH of the material to 7 and separate the black water at the bottom of the material to obtain feed.

[0064] Put the feed into a three-dimensional breeding box, put the earthworms evenly into the feed according to the mass ratio of earthworms and feed to 3:40, and cultivate t...

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Abstract

The invention discloses a method for promoting the formation of Bayer-process red mud macro aggregates. The method comprises the following steps that 1, red mud is subjected to air-drying and sieving,and then gypsum and earthworm manure are added into red mud and evenly mixed, wherein the mass ratio of the gypsum to the earthworm manure to the red mud is (1-6):(2-10):100; 2, water is added into the mixed gypsum, earthworm manure and red mud in the step 1, the field water holding rate of the mixture is kept within 60-80%, culture is conducted at room temperature, and the formation of the red mud macro aggregates is promoted. By means of the method, the content of exchangeable sodium salt in the Bayer-process red mud is reduced through the gypsum, through the utilization of microorganisms and organic matter in the earthworm manure, the formation of the Bayer-process red mud macro aggregates is effectively accelerated, and the red mud is converted into a substrate similar to the soil; the vegetation reconstruction in a red mud storage yard is further achieved; the adopted raw materials are simple and easy to obtain, the method is simple and easy to implement, the Bayer-process red mud can be treated in a large scale, and the problems can be effectively solved that a large amount of mud is stored up and red mud storage causes pollution to the environment.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a method for promoting the formation of large aggregates of Bayer process red mud. Background technique [0002] Red mud is a highly alkaline solid waste produced in the alumina production process. For every 1 ton of alumina produced, about 1.0 to 2.0 tons of red mud will be produced. The stockpiles exceed 4 billion tons, and the stockpiles of red mud in China exceed 600 million tons. The Bayer method is a common process for preparing alumina. Compared with the traditional sintering method, it has the characteristics of low energy consumption and good benefits. However, the red mud produced by the Bayer method after production has high alkalinity, large output, and the active ingredient 2CaO˙SiO 2 Due to the low content of active ingredients, traditional storage and landfill methods will cause serious pollution to the surrounding environment and affe...

Claims

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Application Information

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IPC IPC(8): C01F7/06C05G3/00C05F17/00
CPCC01F7/066C05D9/00C05F17/05C05G3/00C05F3/00C05F5/002C05F11/00Y02W30/40
Inventor 薛生国吴川王琼丽朱锋叶羽真
Owner CENT SOUTH UNIV
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