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Method for removing alkaline dross chloride ions through surfactant

A surfactant and chloride ion technology, applied in the field of comprehensive utilization of alkali slag, can solve the problems that alkali slag cannot be recycled on a large scale and chloride ions are reduced, and achieve the effect that large-scale regeneration cannot be used, the effect is good, and the process is simple

Inactive Publication Date: 2018-04-20
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method draws on the mechanism of dispersion of chemical admixtures, uses water as the dechlorination treatment agent, uses the active dispersant to disperse the aggregate particles in the alkali slag, and then uses water washing and filtration technology to significantly reduce the chloride ions in the alkali slag, which is simple and easy It is feasible and the removal effect of chloride ions is obvious, which provides a new method for the removal of chloride ions in alkali slag, and is conducive to solving the problem that alkali slag cannot be recycled on a large scale

Method used

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  • Method for removing alkaline dross chloride ions through surfactant

Examples

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Comparison scheme
Effect test

Embodiment 1

[0023] Utilize surfactant to remove alkali slag chloride ion, specifically comprise the following steps:

[0024] (1) After mixing the mixture of alkali slag, sodium hexametaphosphate and sodium citrate (sodium hexametaphosphate: sodium citrate=4:1, w / w) and water in a mass ratio of 100:2:300, Put it into a mixer and stir for 15 minutes at a speed of 76 rpm to prepare a uniform slurry;

[0025] (2) Then the slurry is filtered through a filter press for 10 minutes at a pressure of 0.2 MPa, the filter cake is taken out, and the filter cake is put into an oven to dry to a constant weight to obtain a chlor-alkali removal slag.

[0026] The chlorine removal effect of alkali slag is shown in Table 1.

Embodiment 2

[0028] Utilize the method for removing alkali slag chlorine ion by surfactant, specifically comprise the following steps:

[0029] (1) After mixing the mixture of alkali slag, sodium hexametaphosphate and sodium citrate (sodium hexametaphosphate: sodium citrate=4:1, w / w) and water in a mass ratio of 100:4:300, Put it into a mixer and stir for 10 minutes at a speed of 80 rpm to prepare a uniform slurry;

[0030] (2) Filter the slurry through a filter press for 30 minutes at a pressure of 0.1 MPa, take out the filter cake, put the filter cake in an oven and dry it to a constant weight to obtain a chlor-alkali removal slag.

[0031] The chlorine removal effect of alkali slag is shown in Table 1.

Embodiment 3

[0033] Utilize surfactant to remove alkali slag chloride ion, specifically comprise the following steps:

[0034] (1) The mixture of alkali slag, sodium ethylenediamine tetramethylene phosphonate and sodium tripolyphosphate (sodium ethylenediamine tetramethylene phosphonate: sodium tripolyphosphate=3:1, w / w) and After the water is mixed evenly according to the mass ratio of 100:10:400, it is put into a mixer and stirred for 15 minutes at a speed of 84 rpm to prepare a uniform slurry;

[0035] (2) Filter the slurry through a filter press for 20 minutes at a pressure of 0.3 MPa, take out the filter cake, put the filter cake in an oven and dry it to a constant weight to obtain a chlor-alkali removal slag.

[0036] The chlorine removal effect of alkali slag is shown in Table 1.

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Abstract

The invention discloses a method for removing alkaline dross chloride ions through surfactant. The method comprises the following steps of after alkaline dross, the surfactant and water are mixed according to the mass ratio of 50: (1-10): (150-300), stirring the materials completely till uniform slurry is obtained; then, conducting filter pressing through a filter press, so that filter cakes are obtained; and conducting drying, so that dechlorinated alkaline dross is obtained, and removal of the chloride ions in the alkaline dross is completed. The method for removing the alkaline dross chloride ions is simple in process and good in effect; energy is saved, and environment protection is achieved; the surfactant is mixed to the alkaline dross, so that an agglomeration structure in the alkaline dross is destroyed, and thus the accumulation volume of the alkaline dross is reduced; after filter pressing is completed, the content of the chloride ions in the alkaline dross is further lowered; the obtained dechlorinated alkaline dross can be massively applied to building materials, and thus the problem of alkaline dross disposal is effectively solved; and the problem that the alkaline dross cannot be regenerated and reused on a large-scale can be solved conveniently.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of alkali slag, relates to the field of chlorine ion removal of alkali slag, and particularly relates to a method for removing chloride ion of alkali slag by using a surfactant. Background technique [0002] my country is the largest soda ash producer in the world, and the soda ash production in my country is dominated by the ammonia-soda method, and the industrial waste and alkali slag produced by the ammonia-soda method is as high as 3 million tons every year. Due to its high alkali value and high chloride ion content, there is no effective method to deal with it in large quantities at home and abroad. Therefore, most alkali slag production enterprises mainly use stockpiling or reclamation treatment, which not only causes great environmental problems, At the same time, it also restricts the sustainable development of ammonia-soda process enterprises. [0003] Current research ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00
CPCB09B3/00
Inventor 郭文瑛蔡燕飞米浚荣廖镜明陈珊珊林焕杰杨医博王恒昌
Owner SOUTH CHINA UNIV OF TECH
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