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Electric dechlorination method for large-volume alkaline residues

An alkaline residue and electric technology, applied in the field of environmental engineering, can solve the problems of high treatment cost of dehydration technology, increased economic burden on enterprises, and high removal cost, and achieve the effects of eliminating potential threats, improving resource utilization, and improving removal efficiency.

Active Publication Date: 2022-02-25
浙江坤德创新岩土工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, using the electric technology based on this principle to dechlorinate alkali slag faces many problems: 1) the chlorine ions migrated to the electrode will form chlorine gas, which will cause serious pollution to the air; 2) Hydrogen ions will be generated at the anode, which will form a strong acid environment in a large area near the anode, causing the calcium ions in the calcium carbonate we want to keep in the alkali slag to be eroded, making this technology almost impractical Significance; 3) If the traditional electric technology is used to remove chlorine, the chloride and calcium ions formed after CaCl2 dissolve in water will be completely removed; but the harmful components are actually only chloride ions, while calcium The ions are not only harmless, but also the ions needed for subsequent resource utilization; if only chloride ions can be removed while calcium ions are retained, it will not only reduce the removal cost due to the reduced required removal amount, but also increase the beneficial effect. In addition, the alkali slag of the alkali plant is usually discharged as waste slurry with high water content and stored in the waste slag intercepted by the dam body
In order to harmlessly treat or recycle alkali slag, it must be dehydrated; however, there is no suitable dehydration method for large-scale waste slag; However, the processing cost of these dehydration technologies is too high, which adds a huge economic burden to the enterprise.

Method used

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  • Electric dechlorination method for large-volume alkaline residues
  • Electric dechlorination method for large-volume alkaline residues
  • Electric dechlorination method for large-volume alkaline residues

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0116] The alkali slag discharged from the production process of the alkali plant, calcium carbonate 66.4%, calcium chloride 9.8%, sodium chloride 4.9%, moisture content 268%; permeability coefficient 1.15×10 -6 cm / s; pH 11.6. Target value: Chloride ion removal 95%, water content reduced to 100%. It is intended to be used as an industrial raw material after dechlorination, so it is hoped to retain as much calcium ions as possible.

[0117] According to the injection rate of waste slag slurry, the time for injecting a layer of alkali slag matches the time for dechlorination and dehydration of a layer of alkali slag, and the piling rate of alkali slag can ensure the stability of the alkali slag pile. Wide, 35m long, piled up 25m.

[0118] choose Figure 7 to Figure 10 The shown synchronous pressure water injection and drainage electrode is used as the anode electrode; the water injection pipeline 11 is a plastic pipe with a width of 2 cm and a height of 1 cm; a plurality of w...

Embodiment 2

[0136] Alkali slag that is discharged from the production of soda ash. Composition: calcium carbonate 56.8%, calcium chloride 9.2%, sodium chloride 3.8%, calcium oxide 3.5% in dry matter; moisture content 96.4%, pH value 11.2.

[0137] The anode electrode is used as Figure 11 and Figure 12 A water-permeable electrode of the structure shown. Wherein the water-passing pipe 111 is a plastic pipe, the nozzle width is 15cm, and the thickness is 7mm; There are two plastic strips as the positioning frame 113 to fix the position of the conductive strip 112 . Small holes with a diameter of 1 mm are distributed at intervals of 1 cm horizontally and vertically on the pipe wall of the water-passing pipe 111 , and the water-passing pipe 111 is covered with a geotechnical non-woven fabric as a filter layer. The cathode electrode is a conductive plastic plate with a thickness of 14.5 cm and a thickness of 1.5 mm.

[0138] According to the discharge rate of alkali slag from the soda pla...

Embodiment 3

[0147] The alkali slag discharged from the production process of the alkali plant, calcium carbonate 66.4%, calcium chloride 9.8%, sodium chloride 4.9%, moisture content 268%; permeability coefficient 1.15×10 -6 cm / s; pH 11.6.

[0148] Target value: Chloride ion removal 95%, water content reduced to 100%. It is intended to be used as an industrial raw material after dechlorination, so it is hoped to retain as much calcium ions as possible.

[0149] According to the injection rate of the alkali plant waste slurry, the time for injecting a layer of alkali slag matches the time for dechlorination and dehydration of a layer of alkali slag, and the piling rate of alkali slag can ensure the stability of the alkali slag pile. Take 25m wide, 30m long, pile up 25m.

[0150] choose Figure 7 ~ Figure 10 The shown synchronous co-pressure water injection and drainage electrode is used as an anode electrode; The drainage belt 9 is made of plastic and includes a drainage pipe and a drai...

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Abstract

The invention relates to the technical field of environmental engineering, in particular to an electric dechlorination method for large-volume alkaline residues, and solves the current situation that no economical and effective dechlorination and dehydration method is provided for the large-volume alkaline residues. According to the method, two technical obstacles encountered when an electric technology is used for decontaminating a specific substance such as the alkaline residues are solved, namely, a strong acid environment is formed near an anode, calcium ions in calcium carbonate expected to be reserved are corroded, and harmful chlorine is generated at the anode to pollute the environment; according to the technology, harmful chloride ions can be selected for removing the alkaline residues, and beneficial calcium ions are reserved, so that the total amount of substances needing to be removed is reduced, the removal efficiency is improved, and the decontamination cost is reduced; meanwhile, more beneficial substances can be retained, and the resource utilization rate of the waste residues is increased; the volume of the waste residue can be greatly reduced, and the land occupation of a waste residue storage yard is reduced, and the harmless waste residue without pollutants can be recycled as an industrial raw material.

Description

technical field [0001] The invention relates to the technical field of environmental engineering, in particular to an electric chlorine removal method for a large amount of alkali slag. Background technique [0002] Soda slag is the waste slag discharged from the production of soda ash, and 300-600kg of waste slag is discharged for every ton of soda ash produced. An alkali plant can discharge hundreds of thousands of tons of waste slag every year. At present, there is no suitable technology for utilizing alkali slag in the world. The alkali slag is basically piled up in the waste residue yard; the accumulated alkali slag pollutes the environment, and the storage yard is limited, so the storage method is unsustainable, and it is difficult for enterprises to bear the continuous production The huge cost consumption caused by the accumulation and storage of the produced alkali slag. The main components in the alkali slag are CaCO 3 , and a part of CaCl 2 and other soluble sa...

Claims

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Application Information

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IPC IPC(8): B09B3/70
CPCB09B3/00
Inventor 黄新刘钟张楚福吕美东
Owner 浙江坤德创新岩土工程有限公司