Method for producing refined moisture diffusion industrial salt based on underground recycling of waste liquid

A technology for industrial salt and waste liquid, applied in the direction of alkali metal chloride, etc., can solve the problem of restricting the use of mixed condensate water, and achieve the effect of significant water saving, saving purification treatment cost, and speeding up the dissolution rate.

Active Publication Date: 2014-08-06
江苏苏盐井神股份有限公司 +1
View PDF7 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The water quality of the secondary steam condensate has a lot to do with the process control. For the salt production device using the multi-effect evaporation salt production process, the total salt content index in the final effect mixed condensate is usually 500mg / l~1600mg / l l, the index of chloride ion is usually 200mg / l~800mg / l, and the temperature is usually 40℃~70℃. Although there are many ways of recycling, such as supplementary water for circulating cooling water or cooling water for equipment, its relatively high Chloride content and higher temperatures often limit the use of mixed condensate

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for producing refined moisture diffusion industrial salt based on underground recycling of waste liquid
  • Method for producing refined moisture diffusion industrial salt based on underground recycling of waste liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1. CaCl 2 Ammonia-alkali waste liquid with a content of 111g / l is added to salt-making wastewater at a temperature of 60°C, and the blending ratio is controlled to be 1:14, that is, 1 part of ammonia-soda waste liquid is mixed with 14 parts of salt-making wastewater (the pH value of the mixture is about After 12), it is injected into the downhole rock salt solution cavity, and the rock salt is dissolved downhole, and the sulfate and magnesium ions in the original brine are simultaneously removed. 2 SO 4 Content about 10g / l, CaSO 4 Low-nitrate brine with a content of 2.5-2.7g / l.

[0040] 2. Add soda ash to the mined low-nitrate brine, stir to make the soda ash react with calcium sulfate in the low-nitrate brine until the calcium ion content in the brine is detected to be lower than 20mg / l, then add 3g / m 3 The sodium polyacrylate of brine (add in the form of sodium polyacrylate solution of 0.3wt% concentration. The number-average molecular weight of sodium polyacrylate...

Embodiment 2

[0043] 1. CaCl 2 Ammonia-alkali waste liquid with a content of 120g / L is added to salt-making wastewater at a temperature of 60°C, and the blending ratio is controlled to be 1:14, that is, 1 part of ammonia-alkali waste liquid is mixed with 14 parts of salt-making wastewater (the pH of the mixture is about After 11.5), it is injected into the downhole rock salt solution cavity to dissolve the rock salt downhole and remove the sulfate and magnesium ions in the original brine at the same time. After 3 to 5 days of settlement, the NaCl content is 300~312g / l, and the NaCl content is 300~312g / l. 2 SO 4 Content about 8g / L, CaSO 4 Low-nitrate brine with a content of 2.6-2.8g / L.

[0044] 2. Add soda ash to the mined low-nitrate brine, stir to make the soda ash react with calcium sulfate in the low-nitrate brine until the calcium ion content in the brine is detected to be lower than 20mg / l, then add 2g / m 3 The sodium polyacrylate of brine (add in the form of sodium polyacrylate solu...

Embodiment 3

[0047] 1. CaCl 2 Ammonia-alkali waste liquid with a content of 111g / l is added to salt-making wastewater at a temperature of 60°C, and the blending ratio is controlled to be 1:11, that is, 1 part of ammonia-alkali waste liquid is mixed with 11 parts of salt-making wastewater (the pH value of the mixture is about After 11.5), it is injected into the downhole rock salt solution cavity to dissolve the rock salt downhole and remove the sulfate and magnesium ions in the original brine at the same time. After 3 to 5 days of settlement, the NaCl content is 302 to 314g / L, and the NaCl content is 302 to 314g / L. 2 SO 4 Content about 7g / L, CaSO 4 Low-nitrate brine with a content of 2.7-2.9g / L.

[0048] 2. Add soda ash to the mined low-nitrate brine, stir to make the soda ash react with calcium sulfate in the low-nitrate brine until the calcium ion content in the brine is detected to be lower than 20mg / L, then add 3g / m 3 The sodium polyacrylate of brine (add in the form of sodium polya...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
molecular weight distributionaaaaaaaaaa
molecular weight distributionaaaaaaaaaa
molecular weight distributionaaaaaaaaaa
Login to view more

Abstract

The invention discloses a method for producing refined moisture diffusion industrial salt based on underground recycling of waste liquid. The method comprises the following steps: (1) mixing waste water of salt production with ammonia alkali waste liquid in proportion; (2) injecting the mixed waste liquid obtained in step (1) into an underground mirabilite type rock salt cavern; after sufficient reaction and natural sedimentation, extracting low-nitrate brine; (3) injecting the low-nitrate brine obtained in step (2) into a reaction barrel, injecting a sodium carbonate solution into the barrel, and adding a certain amount of sodium polyacrylate as a coagulant aid; then, stirring and standing, and removing calcium ions out of the brine to obtain refined low-nitrate brine; (4) carrying out secondary preheating on the refined low-nitrate brine obtained in the step (3), carrying out evaporation, concentration, crystallization and solid-liquid separation, and carrying out centrifugal separation on underflow salt slurry to obtain a refined moisture diffusion industrial salt product; (5) with liquid obtained by solid-liquid separation and centrifugal separation in the step (4) as the waste water of salt production, supplying the waste water into the step (1), blending the waste water with the ammonia alkali waste liquid in proportion, and injecting the mixture into the underground rock salt cavern as a brine extracting source, thus realizing the recycling of waste liquid.

Description

technical field [0001] The invention belongs to the field of salt products, and in particular relates to a method for producing refined wet industrial salt based on downhole recycling of waste liquid Background technique [0002] In recent years, the production capacity and market demand of my country's two major industries of soda ash and caustic soda have grown rapidly, and China has become the world's largest producer and consumer. As the leading industry of raw salt consumption in my country, the rapid development of the two alkali industries has driven and stimulated the rapid expansion of raw salt production scale. In 2012, the total consumption of raw salt in my country reached 86.6 million tons, of which 70.75 million tons were used in the soda ash and caustic soda industries, accounting for 81.7% of the total national salt consumption. From the perspective of raw salt production capacity, the proportion structure of well mine salt production has continued to increa...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/06
Inventor 刘正友蒋海斌张文广何卉王桂春万子陵
Owner 江苏苏盐井神股份有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap