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Method for reducing strong alkalinity of red mud

A strong alkaline and red mud technology, applied in the field of red mud resource utilization, can solve the problems of great harm, loss of red mud components, strong corrosion of acidic solution, etc., and achieve increased organic nutrients, large specific surface area, and wide source of raw materials Effect

Active Publication Date: 2020-04-10
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Different treatment technologies or methods of red mud must solve the problem of strong alkalinity of red mud. Strong alkalinity is a key issue restricting the comprehensive treatment or resource utilization of red mud. The existing technology generally uses acidic solutions such as hydrochloric acid, sulfuric acid, and nitric acid. Treatment, dealkalization of acidic solution simultaneously destroys the chemical structure of red mud and leaches a large amount of metal elements, resulting in the loss of red mud components; there are problems such as strong corrosion of acidic solution, large amount of waste liquid, and high cost; the generated acidic waste liquid contains a large amount of harmful Metal, hazardous and difficult to handle

Method used

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  • Method for reducing strong alkalinity of red mud
  • Method for reducing strong alkalinity of red mud

Examples

Experimental program
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Effect test

Embodiment 1

[0097] The method for reducing the strong alkalinity of red mud of the present embodiment may further comprise the steps:

[0098] Step S1, adding the biomass raw material (in this embodiment, straw) into the crusher 1, and the crusher 1 crushes the straw into a powder with a particle size of 1 mm;

[0099] Step S2, use the material lifting mechanism 4 to transport the powder into the mixing tank 2 from the first feeding port, and then add water and catalyst (the catalyst is red mud in this embodiment) into the mixing tank 2 through the second feeding port , stirring to obtain a mixture, the stirring speed is 700rpm, the stirring time is 20min, and the mass ratio of powder, water and catalyst is: 0.3:1:0.0025;

[0100] Step S3, adding the mixed material to the autoclave 3, heating the autoclave 3 at 30°C / min, heating to 180°C, and keeping it warm for 20 minutes; then cooling to room temperature to obtain a hydrothermal carbonization product;

[0101] Step S4, performing solid...

Embodiment 2

[0104] The method for reducing the strong alkalinity of red mud in this embodiment adopts the same overall steps as in Embodiment 1, wherein different parameters are as follows:

[0105] Step S1, the biomass raw material is fallen leaves, and the fallen leaves are crushed into powders with a particle size of 1.5 mm;

[0106] Step S2, the catalyst is calcined red mud powder, the stirring speed is 300rpm, the stirring time is 120min, and the mass ratio of powder, water and catalyst is: 0.6:1:0.01;

[0107] Step S3, heat up the autoclave 3 at 50°C / min, heat up to 120°C, and keep it warm for 120min;

[0108] Step S4, the specific surface area of ​​the hydrothermal charcoal is 60m 2 / g, the yield of hydrothermal charcoal is 85%; The mass percentage of humic acid in hydrothermal charcoal is 5%;

[0109] Step S5, the mass percentage of red mud in the mixture of hydrothermal charcoal liquid and red mud is 60%, stirring at a speed of 300rpm for 10h, wherein the pH value of red mud is...

Embodiment 3

[0111] In this example, the modified red mud of Example 1 or 2 is used as a red mud soil matrix. Specifically, straw powder and livestock manure are added to the modified red mud and stirred evenly to obtain a red mud soil matrix. Among them, the mass ratio of modified red mud, straw powder and livestock manure is: 3-7:2-5:1-2.

[0112] The red mud soil matrix is ​​used for planting ryegrass, and the growth is good. It can be seen that the red mud soil matrix of the present application can be better suitable for plant growth.

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Abstract

The invention discloses a method for reducing the strong alkalinity of red mud, belongs to the technical field of red mud utilization, and aims to solve the problems that in the prior art, the using amount of an acidic solution for adjusting the alkalinity of red mud is large, the corrosive property of the acidic solution is strong, the cost is high, a large amount of waste liquid, which is hard to process, is generated, and the recovery rate of red mud is low. The method comprises following steps: grinding a biomass raw material by a crusher to obtain biomass powder; delivering biomass powder, water and a catalyst into a stirring pot, stirring to obtain a mixed material; adding the mixed material into a high pressure reactor, heating the high pressure reactor, maintaining the temperature;then cooling to the room temperature to obtain a hydrothermal carbonization product; subjecting the hydrothermal carbonization product to solid-liquid separation to obtain hydrothermal charcoals anda hydrothermal charcoal liquid; mixing the hydrothermal charcoal liquid and red mud, adding the mixture into a stirring tank, stirring, and carrying out solid-liquid separation then to obtain solid modified red mud with reduced alkalinity. The provided method reduces the strong alkalinity of red mud.

Description

technical field [0001] The application relates to the technical field of red mud resource utilization, in particular to a method for reducing the strong alkalinity of red mud. Background technique [0002] Red mud is an industrial solid waste produced in the alumina production process. According to different production processes, red mud is mainly divided into Bayer red mud, sintering red mud and combined red mud. Due to bauxite raw materials, production processes, etc. Due to different factors, there are certain differences in the composition, properties, and phases of the red mud produced; with the continuous growth of alumina production, the global stock of red mud is also rising, and the global red mud discharge has reached 2.6 billion in 2007. Ton. With the continuous growth of the demand for the development of the aluminum industry in China, the output of alumina has also increased rapidly. It is estimated that the discharge of red mud in my country in 2009 has exceed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B53/02B09B5/00B09B3/00
CPCC10B53/02B09B3/00B09B5/00B09B3/40Y02E50/10
Inventor 王重庆曹亦俊
Owner ZHENGZHOU UNIV
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