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Harmless treatment and resource utilization method for alkaline residue of soda ash prepared by ammonia-alkali process

A technology of ammonia-soda method and alkali slag, which is applied in the field of harmless treatment and resource utilization of alkali slag in the production of soda ash by ammonia-soda method, and can solve the problems of easy recovery into paste, unfavorable comprehensive resource utilization of alkali slag, pollution, etc. problem, to achieve the effect of easy pulverization and non-sticky, easy resource utilization, and reduced use cost

Active Publication Date: 2021-03-26
李开春 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The alkali slag itself has a high viscosity and is easy to form agglomerates, so that reagents such as flocculants and curing agents cannot be evenly wrapped, so that the effect of adding reagents for flocculation and curing treatment is not good.
In addition, even after this type of alkali residue is dehydrated and dried, the formed dry residue is still relatively viscous and has strong hydrophilicity, which makes it easy to return to a paste when dry-frying meets water, and its strength is very low, which is not conducive to the comprehensive resource of alkali residue utilization
[0011] 2) Pollutants cause alkali slag to be unable to be used as resources
[0012] Due to the high alkalinity and Cl in the alkali slag - , and NH 3 and heavy metals, etc., when the dry slag after dehydration is utilized as a resource, the leaching water will pollute the groundwater, and at the same time, the high alkalinity and Cl - It will also cause corrosion to the buildings and structures after resource utilization
And besides high alkalinity is easy to adjust PH treatment, Cl - and NH 3 It is difficult to remove and the processing cost is high
[0013] At present, for the above characteristics, it is difficult to dehydrate and harmlessly treat alkali slag, and there is no existing technology to propose a treatment and resource utilization plan

Method used

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  • Harmless treatment and resource utilization method for alkaline residue of soda ash prepared by ammonia-alkali process
  • Harmless treatment and resource utilization method for alkaline residue of soda ash prepared by ammonia-alkali process
  • Harmless treatment and resource utilization method for alkaline residue of soda ash prepared by ammonia-alkali process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] Embodiment 1: Treatment of highly alkaline, high ammonia nitrogen, high salinity, high water content alkali slag

[0070] The alkali slag aimed at in this embodiment has the following characteristics: high alkalinity, high ammonia nitrogen, high salinity, high water content (pH>9, ammonia nitrogen content 64-97mg / L, water content 30-80%, chloride ion content 22-27% ), in addition, it also has the characteristics of strong colloid, high viscosity, more bound water, and strong hydrophilicity.

[0071] This embodiment adopts figure 1 The method shown is used for treatment, and the system includes a mixed concentration section, a physicochemical reaction section and a mechanical dehydration section connected in sequence.

[0072] The mixing and concentrating section includes a dissolving and mixing tank and a first concentrator connected in sequence.

[0073] The physical-chemical reaction section includes a physical-chemical reactor, a catalytic redox reactor, a second c...

experiment example 1

[0102] Component analysis after experimental example 1 alkali slag treatment of the present invention:

[0103] The soda slag in this experiment example is the soda slag produced by the ammonia-soda method soda plant, which mainly has the following characteristics: high alkalinity, high ammonia nitrogen, high salinity, and high water content. In addition, it also has strong colloidal properties, high viscosity, bound water Many, hydrophilic characteristics.

[0104] 1. Composition analysis of original alkali slag

[0105] According to relevant national standards and local standards of Jiangsu Province, after a comprehensive analysis of the production process of alkali slag, its main pollution sources are mainly concentrated in pH and ammonia nitrogen. For safety reasons, heavy metal pollution was also tested.

[0106] Laboratory tests show that the solid pH and ammonia nitrogen content in the alkali slag pool exceed the standard, which is the main control item. The details a...

experiment example 2

[0162] Experimental example 2: Evaluation of the properties of alkali slag after treatment as filling soil for engineering sites

[0163] According to the characteristics of alkali slag and the local environment and economic situation of resource utilization, it is planned to use the treated alkali slag as the filling soil of the project site for resource utilization. As a general engineering site fill, according to the standard specifications and construction experience, it should meet a certain bearing capacity, and its corrosion characteristics, freeze-thaw characteristics, reinforcement characteristics, hydrolysis and water softening and disintegration characteristics should be evaluated.

[0164] The specific test results are as follows:

[0165] 1. Carrying capacity

[0166] Alkali slag is used as backfill soil, and the characteristic value of bearing capacity after absorbing water and deliquescence saturation is not less than 80kPa.

[0167] For this reason, the treat...

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Abstract

The invention belongs to the technical field of comprehensive treatment of industrial waste, and particularly relates to a harmless treatment and resource utilization method for alkaline residue of soda ash prepared by ammonia-alkali process. Directed at the characteristics of high salinity, high ammonia nitrogen, high chloride ions, high viscosity and high moisture content of alkaline residue generated by soda ash preparation by an ammonia-alkali process, harmless and resourceful treatment is very difficult at present. The invention provides the harmless treatment method for alkaline residueof soda ash prepared by ammonia-alkali process, and the method comprises the following steps of: concentrating alkaline residue generated by soda ash prepared by the ammonia-alkali process and / or adding water to a mean value, sequentially adding a composite physicochemical treatment agent and a flocculating agent, and conducting concentrating and dehydrating to obtain treated harmless, reduced andrecycled alkaline residue and reuse water or standard water. The method is suitable for treating the alkaline residue generated in the process of preparing soda ash by the ammonia-alkali process, andparticularly aims at treatment and resource utilization of the alkaline residue with high alkalinity, high ammonia nitrogen, high salinity, high water content, high colloid property, high viscosity,much bound water and high hydrophilicity.

Description

technical field [0001] The invention belongs to the technical field of comprehensive treatment of industrial waste, and in particular relates to a method for harmless treatment of alkali slag of soda ash produced by ammonia-soda method and resource utilization method thereof. Background technique [0002] Soda ash is one of the most important raw materials of basic chemical industry, and its output and consumption are one of the important indicators to measure the level of national industrial development. The method of producing soda ash is the ammonia-soda method, which has been around for more than 130 years. The ammonia-alkali method uses raw salt and quicklime as raw materials, melts the raw salt into saturated brine, removes calcium and magnesium impurities in brine and brine, then absorbs ammonia to form ammonia brine, and then carbonizes to obtain sodium bicarbonate with low solubility (also weighed Alkali), filtered and burned, that is, soda ash. Filter the mother ...

Claims

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Application Information

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IPC IPC(8): A62D3/30A62D101/45A62D101/43A62D101/49
CPCA62D3/30A62D2101/45A62D2101/43A62D2101/49A62D2203/02
Inventor 李开春魏常枝
Owner 李开春
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