Method for purifying brine by using mixed liquid of ammonia alkali waste residues and waste liquids and flue gas

A technology for purification of ammonia-alkali waste slag and brine, which is applied in the fields of alkali metal halide purification, alkali metal chloride, energy input, etc., can solve problems such as unreasonable distribution of industrial layout, extended product transportation distance, etc., and improve brine recovery rate , reduce the content of sulfate ions, and reduce the effect of treatment costs

Inactive Publication Date: 2020-02-04
JIANGXI JINGHAO SALINIZATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The waste liquid problem of the ammonia-soda plant greatly limits the regional distribution of the soda plant, which makes the transportation distance of products and raw materials longer, and the distribution of industrial layout is unreasonable. With the increase of environmental protection pressure, many enterprises can only continue to increase a lot of cost to deal with waste residue waste liquid

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  • Method for purifying brine by using mixed liquid of ammonia alkali waste residues and waste liquids and flue gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] S1. Separating the waste slag and waste liquid mixed liquid from the soda ash ammonia distillation process through the cyclone sand separator, and sieving out the alkali slag with a particle size greater than 1.2mm;

[0041] S2. After sand separation, the high-temperature waste residue and waste liquid mixture first enters the waste heat power generation process to cool down, then enters the flash barrel for vacuum flashing, and then cools down to below 68°C. After cooling, the waste residue and waste liquid mixture enters the mixing machine with a stirring device Temporary storage of liquid storage tanks;

[0042] S3. Transport the mixed liquid of waste slag and waste liquid in the above S2 to the storage tank of the mine through two pipelines by a slurry pump for temporary storage, and continuously and fully stir;

[0043] Wherein the pipeline is a corrosion-resistant, abrasion-resistant, temperature-resistant, smooth non-metallic pipeline.

[0044] Wherein the transpo...

Embodiment 2

[0050] S1. Separating the waste slag and waste liquid mixed liquid from the soda ash ammonia distillation process through the cyclone sand separator, and sieving out the alkali slag with a particle size greater than 1.2mm;

[0051] S2. After sand separation, the high-temperature waste slag and waste liquid mixture first enters the waste heat power generation process to cool down, then enters the flash tank for vacuum flashing, and then cools down to below 68°C. After cooling, the waste slag and waste liquid mixture enters the mixing machine with a stirring device Temporary storage of liquid storage tanks;

[0052] S3. Transport the mixed liquid of waste slag and waste liquid in the above S2 to the storage tank of the mine through two pipelines by a slurry pump for temporary storage, and continuously and fully stir;

[0053] Wherein the pipeline is a corrosion-resistant, abrasion-resistant, temperature-resistant, smooth non-metallic pipeline.

[0054] Wherein the transportatio...

Embodiment 3

[0060] S1. Separating the waste slag and waste liquid mixed liquid from the soda ash ammonia distillation process through the cyclone sand separator, and sieving out the alkali slag with a particle size greater than 1.2mm;

[0061] S2. After sand separation, the high-temperature waste slag and waste liquid mixture first enters the waste heat power generation process to cool down, then enters the flash tank for vacuum flashing, and then cools down to below 68°C. After cooling, the waste slag and waste liquid mixture enters the mixing machine with a stirring device Temporary storage of liquid storage tanks;

[0062] S3. Transport the mixed liquid of waste slag and waste liquid in the above S2 to the storage tank of the mine through two pipelines by a slurry pump for temporary storage, and continuously and fully stir;

[0063] Wherein the pipeline is a corrosion-resistant, abrasion-resistant, temperature-resistant, smooth non-metallic pipeline.

[0064] Wherein the transportatio...

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Abstract

The invention provides a method for purifying brine by using a mixed liquid of ammonia alkali waste residues and waste liquids and flue gas. The method comprises the following specific steps: S1, screening off sand of a mixed liquid of soda ash waste residues and waste liquids; S2, firstly cooling the sand screened high-temperature mixed liquid of soda ash waste residues and waste liquids througha waste heat power generation procedure, performing vacuum flash, and further reducing the temperature to 68 DEG C or lower; S3, conveying the mixed liquid of soda ash waste residues and waste liquidsto a mine through a pipeline; S4, performing solid-liquid two-phase fluid injection on the mixed liquid of soda ash waste residues and waste liquids, and performing a reaction in a rock salt ore solution chamber; S5, injecting flue gas, performing underground brine purification, and performing brine extraction so as to obtain low-nitrate brine; and S5a, after brine extraction, injecting flue gas,purifying on-ground brine, so as to obtain low-nitrate brine. By adopting the method provided by the invention, calcium and magnesium ion impurities in the brine can be effectively removed, sulfate ions in the brine can be also effectively reduced, and low-nitrate brine that can be used for alkali making can be obtained. The pollution caused by waste residues and wastewater discharge in the traditional alkali making industry can be also solved, the greenhouse effect caused by carbon dioxide emission can be also reduced, and the brine purification treatment cost and the soda raw material processing cost can be also reduced.

Description

technical field [0001] The invention relates to the field of industrial waste recycling, in particular to a method for purifying brine by using ammonia-alkali waste residue waste liquid mixture and flue gas. Background technique [0002] Salt is known as the "mother of chemical industry", and its derivative products amount to more than 15,000 kinds, which are widely used in industry, agriculture, animal husbandry, construction, transportation, medicine, national defense and other fields. At the same time, as a necessity for human survival, salt is a basic condiment on the table, known as the "king of all flavors", and plays a pivotal role in the daily life of the national economy. [0003] The brine after water solution mining of mineral salt also contains Ca 2+ , Mg 2+ The existence of these impurities has a great impact on product quality and production process. During the salt production process due to Ca 2+ , Mg 2+ The existence of ions will be precipitated on the e...

Claims

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Application Information

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IPC IPC(8): C01D3/16C01D3/06
CPCC01D3/06C01D3/16Y02P20/129
Inventor 胡景李春林万李应虎
Owner JIANGXI JINGHAO SALINIZATION
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