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A method of using industrial waste to reduce the alkalinity of red mud

A technology of industrial waste and red mud, which is applied in the field of environmental protection, can solve the problems of high cost of alkaline regulation of red mud and unsatisfactory effect, so as to increase permeability and water storage capacity, improve the prevention of red mud crusting, The effect of simple equipment

Active Publication Date: 2020-05-26
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a method for reducing the alkalinity of red mud by using industrial waste to solve the problems of high cost and unsatisfactory effect of red mud alkalinity control

Method used

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  • A method of using industrial waste to reduce the alkalinity of red mud
  • A method of using industrial waste to reduce the alkalinity of red mud

Examples

Experimental program
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Effect test

Embodiment 1

[0033] The method for reducing the alkalinity of red mud by using industrial waste described in this embodiment comprises the following steps:

[0034] (1) Air-dry the red mud from the Bayer process at room temperature, and pass it through a 10-mesh sieve after grinding; use a filter membrane to filter the ammonia-nitrogen waste liquid in the fertilizer industry to obtain ammonia-nitrogen waste water; then NH 4 + Ammonia nitrogen wastewater with a concentration of 80mmol / L was added to the red mud, and the liquid-solid ratio was kept at 3:1, mixed evenly, and stirred for 1 hour with a magnetic stirrer at a speed of 60r / min.

[0035] (2) The red mud slurry in step 1) is naturally settled in a settling tank for solid-liquid separation, and the filtrate is returned to step 1) to obtain red mud filter residue.

[0036] (3) Add the red mud filter residue separated in step 2 to broken phosphogypsum, the mass ratio of phosphogypsum to red mud filter residue is 1:100, keep the field ...

Embodiment 2

[0042] The method for reducing the alkalinity of red mud by using industrial waste described in this embodiment comprises the following steps:

[0043] (1) Air-dry the red mud from the Bayer process at room temperature, and pass through a 10-mesh sieve after grinding; use a filter membrane to filter the ammonia nitrogen waste liquid in the petroleum industry to obtain ammonia nitrogen wastewater, and then NH 4 + Ammonia nitrogen wastewater with a concentration of 90.0mmol / L was added to the red mud, and the liquid-solid ratio was kept at 2:1, mixed evenly, and stirred for 3 hours with a magnetic stirrer at a speed of 80r / min.

[0044] (2) Settling the red mud slurry in step 1) naturally in a settling tank for solid-liquid separation, and returning the filtrate to step 1) to obtain a filter residue.

[0045] (3) The red mud filter residue separated in step 2) is added to the broken phosphogypsum, the mass ratio of phosphogypsum to the red mud filter residue is 1:50, and the fiel...

Embodiment 3

[0048] The method for reducing the alkalinity of red mud by using industrial waste described in this embodiment comprises the following steps:

[0049] (1) Air-dry the red mud from the Bayer process at room temperature, pass through a 10-mesh sieve after grinding; use a filter membrane to filter the ammonia nitrogen waste liquid in the chemical industry to obtain ammonia nitrogen wastewater, and then NH 4 + Ammonia nitrogen wastewater with a concentration of 95mmol / L was added to the red mud, and the liquid-solid ratio was kept at 3:1, mixed evenly, and stirred for 2 hours with a magnetic stirrer at a speed of 80r / min.

[0050] (2) Settling the red mud slurry in step 1) naturally in a settling tank for solid-liquid separation, and returning the filtrate to step 1) to obtain a filter residue.

[0051] (3) The red mud filter residue separated in step 2) is added to the crushed phosphogypsum, the mass ratio of phosphogypsum to the red mud filter residue is 1:50, and the field wa...

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Abstract

The invention provides a method for reducing the alkalinity of red mud by utilizing industrial wastes. The method comprises the following steps of (1) mixing filtered ammonia-nitrogen wastewater and the red mud, and then stirring to obtain a red mud slurry, wherein the mass ratio of the ammonia-nitrogen wastewater to the red mud is 2 to 4:1; (2) carrying out sedimentation and solid-liquid separation on the red mud slurry obtained in the step (1) to obtain a filter liquor and a filter residue; and (3) adding crushed phosphogypsum into the filter residue obtained in the step (3), then adding water, and cultivating at the room temperature so as to obtain the low-alkalinity red mud, wherein the mass ratio of the phosphogypsum to the filter residue is 1 to 5:100. The method provided by the invention has the characteristics of simplicity in process and low cost; and the Bayer process red mud can be treated in a large scale, the treated red mud can be recycled, the storage yard plants are reconstructed, and favorable social benefit and economic benefit are produced.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a method for reducing red mud alkalinity by using industrial waste. Background technique [0002] Red mud is industrial solid waste produced during the production process of alumina industry. The main disposal method is to build dams and stockpile, which takes up a lot of land and consumes manpower and financial resources. The attached liquid produced in the stockyard is prone to infiltration, polluting farmland soil, surface and groundwater The red mud on the surface is easy to form alkaline dust, which pollutes the atmosphere. In the rainy season, the storage yard is prone to dam failure, which threatens the safety of surrounding residents and the environment. Environmental governance of the red mud storage yard is imminent. [0003] At present, the comprehensive utilization of red mud is mainly concentrated in three major areas: recovery of valuable metals, su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00B09B5/00
CPCB09B3/00B09B5/00
Inventor 薛生国李义伟朱锋吴川吴玉俊
Owner CENT SOUTH UNIV
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