Method for removing chloride ions in waste alkaline residues

A waste alkali residue and chloride ion technology, applied in chemical instruments and methods, magnetic separation, solid separation and other directions, can solve the problems of inability to achieve large-scale comprehensive reuse, large chloride ion content, etc., and achieve low energy consumption, Simple process and equipment, high dechlorination efficiency

Active Publication Date: 2015-11-11
唐山睿壕科技有限公司
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0006] The invention provides a method for removing chloride ions in waste caustic slag, so as to solve the proble...

Method used

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  • Method for removing chloride ions in waste alkaline residues

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Effect test

Embodiment 1

[0022] The waste alkali slag is pretreated by mechanical rolling, so that more than 90% of the waste alkali slag has a particle size of ≤1mm. Mix the waste caustic slag and magnetic iron powder evenly according to the mass ratio of 100:1, add a static magnetic field of 4000Gauss, add water 4 times the mass of the spent caustic soda slag, fully stir for 0.5h, carry out water elution of chlorine, and then stand for separation to obtain Precipitate and supernatant, the precipitation is air-dried for 4 days until the water content is <10%, and the magnetic iron powder is removed with a magnet to obtain the dechlorinated alkali slag.

Embodiment 2

[0024] The waste alkali slag is pretreated by mechanical rolling, so that more than 90% of the waste alkali slag has a particle size of ≤1mm. Mix the waste caustic slag and magnetic iron powder evenly according to the mass ratio of 100:1.2, add a static magnetic field of 5000Gauss, add water 5 times the mass of the spent caustic slag, fully stir for 0.5h, carry out water washing to remove chlorine, and then stand for separation to obtain Precipitate and supernatant, the precipitation is air-dried for 5 days until the water content is <10%, and the magnetic iron powder is removed with a magnet to obtain the dechlorinated alkali slag.

Embodiment 3

[0026] The waste alkali slag is pretreated by mechanical rolling, so that more than 90% of the waste alkali slag has a particle size of ≤1mm. Mix the waste caustic slag and magnetite evenly according to the mass ratio of 100:1.2, add a static magnetic field of 4000Gauss, add water 4 times the mass of the spent caustic slag, fully stir for 0.5h, carry out water washing to remove chlorine, and then stand and separate to obtain Precipitate and supernatant, the precipitation is air-dried for 4 days until the water content is <10%, and the magnetite is removed with a magnet to obtain the dechlorinated alkali slag.

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Abstract

The invention discloses a method for removing chloride ions in waste alkaline residues. The method specifically includes the steps that the waste alkaline residues and magnetic substances are evenly mixed according to the mass ratio of 100:0.1-1.5; water with the mass three to six times that of the waste alkaline residues is added; the mixture is fully stirred, water elution, dechlorination and solid-liquid separation are conducted, and then deposits and supernate are obtained; the deposits are dried; and the magnetic substances are removed through a magnet, and then dechlorinated alkaline residues with 90-93% of chloride removed is obtained. The method has the beneficial effects that the settling velocity of the alkaline residues is high, the alkaline residue dechlorination efficiency is high, and the water content of the dechlorinated alkaline residues is low. Meanwhile, the process and equipment are simple, operation is easy, and energy consumption is low. By means of the method, the waste alkaline residues in soda production by the ammonia-soda process are applied to broader fields in a large scale.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of waste slag produced by ammonia soda method, and in particular relates to a method for removing chloride ions in waste soda slag. Background technique [0002] At present, there are three methods of producing soda ash in the world, namely the ammonia soda method, combined soda method and trona method. Most of the large enterprises use the ammonia-alkali method for production, accounting for more than 60% of the total production. However, the ammonia-soda method has been in existence for more than 130 years. Due to the production process, a large amount of alkaline waste liquid and waste residue have been produced. For every 1 ton of soda ash produced, 1 ton of solid alkali residue with a water content of 30-60% needs to be discharged. Due to its high pH value and chlorine content High and hygroscopic. At present, there is no effective large-scale disposal method at home and abroad. Most...

Claims

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Application Information

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IPC IPC(8): B09B3/00B03C1/02
Inventor 孙晓然张秀凤李光跃尚宏周
Owner 唐山睿壕科技有限公司
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