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Saline-alkaline removing method for saline-alkaline waste residue with low permeability

A low-permeability, waste residue technology, applied in the field of waste residue treatment, can solve the problems of no economical and effective removal method for saline-alkali ions, no high efficiency, large-scale engineering application, thick paste mud that is not suitable for separation and treatment costs, etc. Achieve the effects of favorable electrode temperature rise, short processing time and convenient construction

Active Publication Date: 2018-11-30
BEIJING ZHONGYAN DADI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, using alkali slag as raw material can produce silicate bricks, soil improvers, flue gas desulfurizers, cement admixtures, road filling soil (non-arterial roads), etc. Restricted by factors such as difficulty in compounding, viscous paste that is not suitable for separation, and treatment costs, there is no high-efficiency and large-scale engineering application.
[0003] At present, there is no economical and effective removal method for the saline-alkali ions in this kind of waste residue with large volume and low permeability coefficient.
In addition, the process of treating such a large amount of waste residue usually requires a large area of ​​land and takes a long time, and the treated waste residue also needs to occupy a large area of ​​temporary storage yard
These conditions are often difficult to meet

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] The waste residue is the alkali residue discharged from the production of soda ash, with a composition of 57.7% dry matter and 42.3% moisture. In dry matter: calcium sulfate 3%, calcium carbonate 64%, calcium chloride 6, sodium chloride 4%, calcium hydroxide 10%, aluminum oxide 2%. Particle fineness: 50% 10 -5 cm / s; pH 10.9.

[0058] The construction can be stacked with an area of ​​200m×150m. Each layer of alkali slag is 1m thick, and there are 40 layers in total.

[0059] A conductive polymer tube is used as the electrode, with a diameter of 2cm, and the tube wall is distributed along the cross-section of 120° and along the length of 10cm ϕ 4 holes; the length of the electrode is 150m, and a wire is drawn out at an interval of 20m on the electrode. The voltage gradient between the positive and negative electrodes was 1 V / cm.

[0060] The target value of each index: chloride ion removal 90%, sodium ion removal 78%, pH value less than 8.

[0061] Construction meth...

Embodiment 2

[0071] The waste residue is the alkali residue discharged from the production of soda ash. Composition: in dry matter, calcium sulfate 5.59%, calcium carbonate 46.46%, calcium chloride 9.82%, sodium chloride 4.85%, calcium oxide 3.35%, magnesium hydroxide 9.34%, di Silicon oxide 2.52%, acid insoluble matter 15.05%; moisture content 76.4%. Particle fineness 50% 10 -5 cm / s; pH 11.6.

[0072] The construction can be stacked with an area of ​​120m×300m. Each layer of alkali slag is 1.5m thick, and there are 30 layers in total. The cathode is: a PVC water pipe with a diameter of 1cm and a carbon fiber cable with a diameter of 4cm. The anode is a 1.0cm×0.5cm stainless steel strip jacketed with a PVC water pipe with a diameter of 4cm, and the pipe wall is distributed along the cross section at 60° and along the long direction of 10cm ϕ 4 holes, the outermost layer is covered with a layer of non-woven fabric. Each section of electrode is 60m long, and a wire is drawn out at an in...

Embodiment 3

[0087] The waste residue is the red mud discharged from the aluminum plant, the composition: dry matter 52.7%, moisture 57.3%. In dry matter: calcium oxide 40.88%, aluminum oxide 7.48%, silicon oxide 25.36%, iron oxide 1.29%, sodium oxide 3.19%, potassium oxide 1.04%, titanium oxide 1.72%, magnesium oxide 2.12%; fluorine content 3000.3mg / kg, Among them, the soluble fluorine content is 425.1mg / kg; pH=11.1. Particle fineness: less than 50μm, permeability coefficient 1.15 10 -4 cm / s.

[0088] The area of ​​the storage site for construction is 50×30m. Each layer of alkali slag is 1.0m thick, and there are 25 layers in total.

[0089] A commercially available conductive polymer drainage board was used as an electrode, and a wire was drawn out on the electrode at an interval of 15m. The electrode interval of each layer of electrodes is 1.0m. The voltage gradient between positive and negative electrodes is 1.5V / cm, and the power supply mode is intermittent power supply, 15 min...

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Abstract

The invention discloses a saline-alkaline removing method for saline-alkaline waste residue with low permeability, and belongs to the technical field of waste residue treatment. The saline-alkaline removing method is characterized in that a plurality of electrodes with characteristics of electric conduction and water permeation are horizontally arranged to form electrode groups, and the electrodegroups and waste residue layers are stacked alternately; the polarity of a direct current power source connected to any one of the electrodes is opposite to the polarity of a direct current power source connected to at least one of the electrodes surrounding the any one electrode; an appropriate amount of a liquid containing appropriate components is injected through the electrodes; direct currentis applied through the electrodes to generate an electric field in the waste residue; and under the action of the electric field, the soluble ions contained in the saline-alkaline in the waste residue migrate to the electrodes with the opposite polarity, and are carried out by the appropriate liquid through the water permeation pipelines of the electrodes so as to remove the saline-alkaline fromthe waste residue. According to the present invention, the saline-alkaline removing method can perform saline-alkaline removing on a large amount of waste residue, and further has characteristics of short treatment time and small construction occupation area.

Description

technical field [0001] The invention relates to a method for removing salinity and alkali from low-permeability saline-alkali waste residue, which belongs to the technical field of waste residue treatment. Background technique: [0002] Some industrial processes reject moisture with a permeability coefficient lower than 10 -4 cm / s low permeability fine particle waste residue. These waste residues contain a variety of saline-alkali components in relatively high concentrations. For example: the soda slag discharged from the production of soda ash contains a large amount of chloride ions, sodium ions, hydroxide ions and other components. Particles with a particle size smaller than 25 μm can account for up to 98%. Red mud is discarded from the production process of extracting aluminum from bauxite. Its particle size is less than 80μm, which contains fluorine and calcium hydroxide. Due to the large amount of these waste residues, some production plants have stockpiled up to ...

Claims

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Application Information

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IPC IPC(8): B09B3/00
CPCB09B3/00
Inventor 刘兴华刘金龙杨宝森
Owner BEIJING ZHONGYAN DADI TECH CO LTD
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