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Saline-alkaline removing and dewatering combined treatment method for waste residue with characteristics of high water content and low permeability

A low-permeability, high-water-content technology, applied in the direction of solid waste removal, etc., can solve the problems that are difficult to meet, occupy a large area of ​​land, occupy waste residue, etc., achieve short processing time, occupy less land, and realize harmlessness Effect

Inactive 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

[0003] At present, there is no economical and effective dehydration method and saline-alkali removal method for this kind of waste residue with large volume, low permeability coefficient and high water content.
In addition, in the process of treating such a large amount of solid pollutants, it usually takes 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.
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 the alkali factory. The composition of the alkali residue: 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 -7 cm / s; pH 10.9. The water content is 232.3%.

[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 at 30° and along the length direction of 5cm ϕ 2 holes. The electrode length is 150m. Lead out a wire at an interval of 20m on the electrode. Apply a stable DC power supply with a voltage gradient of 1.0 V / cm between the positive and negative electrodes.

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

Embodiment 2

[0075] The waste residue is the alkali residue discharged from the production of the alkali factory. The composition of the alkali residue: 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% %, silicon dioxide 2.52%, acid insoluble matter 15.05%; moisture content 324%. Particle fineness 50% 10 -7 cm / s; pH 11.6.

[0076] The construction can be stacked with an area of ​​120m×200m. Each layer of alkali slag is 1.0m thick, and there are 40 layers in total. The cathode is: a PVC water pipe with a diameter of 1cm carbon fiber cable jacket and a diameter of 2cm. The pipe wall is mesh-shaped, and the outermost layer is covered with a layer of non-woven fabric. The anode is a 1cm×0.5cm stainless steel strip, covered with a PVC water pipe with a diameter of 2cm, the pipe wall is mesh, and the outermost layer is covered with a layer of non-woven fabric. Each section of electrod...

Embodiment 3

[0088] The waste residue is the red mud discarded from the production of the aluminum plant. The red mud composition: 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, of which soluble fluorine content 425.1mg / kg; pH=10.9. The moisture content is 116%. Particle fineness: 25% 10 -5 cm / s.

[0089] The construction can be stacked with an area of ​​200×300m. Each layer of alkali slag is 1.0m thick, and there are 45 layers in total.

[0090] Commercially available conductive polymer drainage boards are used as electrodes, each section of electrode is 40m long, and wires are drawn out from the electrodes every 20m. The electrode interval of each layer of electrodes is 1.0m. The voltage gradient between the electrodes is 1.8V / cm, and the power supply mode is intermittent power supply, with power supply for 15 minute...

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Abstract

The invention discloses a saline-alkaline removing and dewatering combined treatment method for waste residue with high water content and low permeability, and belongs to the field of waste residue treatment. The saline-alkaline removing and dewatering combined treatment method is characterized in that a plurality of pipe-like or strip-like electrodes with characteristics of electric conduction and water permeation are horizontally arranged in parallel at a certain interval to form electrode groups, and the electrode groups and waste residue layers are stacked alternately; an appropriate amount of a liquid containing appropriate components is injected through the electrodes; direct current is applied through the electrodes to generate an electric field in the waste residue; 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 from the waste residue; the water in the waste residue migrate to the electrodes so as to be discharged from the water permeation pipelines; and under the pressure of the overlying waste residue, the water in the waste residue is further squeezed to the electrodes so as to be discharged from the water permeation pipelines. According to the present invention, the saline-alkaline removing and dewatering combined treatment method can simultaneously perform saline-alkaline removing and dewatering, and furtherhas characteristics of short treatment time and small construction occupation area.

Description

technical field [0001] The invention relates to a combined treatment method for desalination, alkali and dehydration of waste residue with high water content and low permeability, belonging to the field of industrial waste residue treatment and utilization. Background technique [0002] Some industrial production processes have discharge permeability coefficients lower than 10 -4 cm / s, fine-grained, saline-alkali-containing waste sludge. Usually these waste residue muds are stored in the waste residue storage intercepted by the dam body. Due to the characteristics of low permeability and high salt content of the waste residue, although the water content has decreased after long-term deposition, it is still in a flow plastic state, and its water content can still be as high as 100-380%. 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 s...

Claims

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Application Information

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