A Circular Economy Process for Co-production of Waste Brine, Magnesium, Potassium, Salt and Alkali from Brackish Water Desalination

A technology for desalination of brackish water and waste salt water, which is applied in the field of circular economy technology, can solve problems such as circular salinization of land, and achieve the effects of no three wastes discharge, reasonable product scheme, and innovative process flow

Active Publication Date: 2019-08-02
CHINA LIGHT IND INT ENG CO LTD +2
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The known brackish water desalination by-product waste brine containing salt, magnesium sulfate, potassium chloride and other components is usually discharged into the sea, but this method is only applicable to coastal areas. It is not suitable to produce waste brine, which will cause the situation of circulating salinized land

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
  • A Circular Economy Process for Co-production of Waste Brine, Magnesium, Potassium, Salt and Alkali from Brackish Water Desalination

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: take 1000m 3 Brackish water desalination by-product waste brine (containing NaCl 30.00g / l, MgSO 4 15.00g / l, KCl 1.00g / l) as raw materials, the waste brine was evaporated (evaporating temperature 25°C) to obtain 125m 3 Concentrated mother liquor (containing NaCl 240g / l, MgSO 4 120g / l, KCl 8.0g / l) add 10 tons of caustic soda (NaOH) and carry out normal temperature reaction (reaction time 2 hours) obtain 7.25 tons of magnesium hydroxide products and 125m 3 Magnesium mother liquor (NaCl 240g / l, Na 2 SO 4 142g / l, KCl 8.0g / l); 125m 3 Magnesium-making mother liquor is mixed with circulating salt-making mother liquor and circulating two-step mother liquor and adds 13.875 tons of potassium chloride and water to carry out one-step double decomposition normal temperature reaction (reaction time 2 hours) and obtains 48.9375 tons of potassium mirabilite intermediate product and one-step mother liquor; One-step mother liquor mixes high-temperature evaporation ( ...

Embodiment 2

[0022] Embodiment 2: take 1000m 3 Brackish water desalination by-product waste brine (containing NaCl 150.00g / l, MgSO 4 75.00g / l, KCl 5.00g / l) as raw materials, the waste brine was evaporated (evaporating temperature 105°C) to obtain 625m 3 Concentrated mother liquor (containing NaCl240g / l, MgSO 4 120g / l, KCl 8.0g / l) add 50 tons of caustic soda (NaOH) and carry out normal temperature reaction (reaction time 2 hours) obtain 36.25 tons of magnesium hydroxide products and 625m 3 Magnesium mother liquor (NaCl 240g / l, Na 2 SO 4 142g / l, KCl 8.0g / l); 625m 3 Magnesium making mother liquor is mixed with circulating salt making mother liquor and circulating two-step mother liquor, and 69.375 tons of potassium chloride and water are added to carry out one-step double decomposition normal temperature reaction (reaction time 2 hours) to obtain 244.6875 tons of potassium Glauber's salt intermediate product and one-step mother liquor; One-step mother liquor is mixed and evaporated at ...

Embodiment 3

[0023] Embodiment 3: take 1000m 3 Brackish water desalination by-product waste brine (containing NaCl 90.00g / l, MgSO 4 45.00g / l, KCl 3.00g / l) as raw materials, the waste brine was evaporated (evaporating temperature 25°C) to obtain 375m 3 Concentrated mother liquor (containing NaCl 240g / l, MgSO 4 120g / l, KCl 8.0g / l) add 30 tons of caustic soda (NaOH) and carry out normal temperature reaction (reaction time 2 hours) obtain 21.75 tons of magnesium hydroxide products and 375m 3 Magnesium mother liquor (NaCl 240g / l, Na 2 SO 4 142g / l, KCl 8.0g / l); 375m 3 Magnesium mother liquor is mixed with circulating salt-making mother liquor and circulating two-step mother liquor, and 41.625 tons of potassium chloride and water are added to carry out one-step double decomposition normal temperature reaction (reaction time 2 hours) to obtain 146.8125 tons of potassium mirabilite intermediate product and one-step mother liquor; One-step mother liquor is mixed and evaporated at high tempera...

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

No PUM Login to view more

Abstract

The invention discloses a cyclic economy technology for co-producing magnesium, potassium, salt and alkali products from brackish water desalination effluent brine. Brackish water desalination byproduct effluent brine is taken as a raw material, caustic soda is added to concentrated mother liquor obtained through evaporation of the effluent brine for a reaction, and magnesium hydroxide and magnesium production mother liquor are obtained; the magnesium production mother liquor, salt production mother liquor and two-step mother liquor are mixed with potassium chloride and water for a one-step double decomposition normal-temperature reaction, and a glaserite intermediate product and one-step mother liquor are obtained; the one-step mother liquor is mixed and evaporated at the high temperature, and sodium chloride and salt production mother liquor are obtained; the glaserite intermediate product is mixed with potassium chloride and water for a two-step double decomposition normal-temperature reaction, and a potassium sulfate product and two-step mother liquor are obtained; the salt production mother liquor and the two-step mother liquor are circulated to the one-step double decomposition normal-temperature reaction; sodium chloride is used for production of caustic soda, the produced caustic soda is used for reaction of the concentrated mother liquor obtained through evaporation of the effluent brine, and the magnesium hydroxide product and the magnesium production mother liquor are obtained. The cyclic economy technology has the cyclic economy characteristics that the technological process is innovative, the product scheme is reasonable, the raw material adaptability is high, the cost and energy consumption are low, no three wastes are emitted, closed cycle is realized and the like.

Description

technical field [0001] The invention relates to the technical field of inorganic chemical industry, in particular to a NaCl-MgSO 4 -KCl-H 2 The desalination by-product waste brine of O system brackish water is a circular economic process for producing magnesium hydroxide, potassium sulfate, sodium chloride and caustic soda as raw materials. Background technique [0002] The known brackish water desalination by-product waste brine containing salt, magnesium sulfate, potassium chloride and other components is usually discharged into the sea, but this method is only applicable to coastal areas. It is not suitable to produce waste brine, which will cause the situation of circulating salinized land. The desalination by-product waste brine of brackish water containing salt, magnesium sulfate, potassium chloride and other components in these areas needs to solve the problem of separating salt, magnesium sulfate, potassium chloride and other inorganic salts. Therefore, it is very ...

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 Patents(China)
IPC IPC(8): C01F5/22C01D7/02C01D3/06C01D1/04
CPCC01D1/04C01D3/06C01D7/02C01F5/22
Inventor 彭赛军刘绍山冯逸仙朱晓峰柴朝辉
Owner CHINA LIGHT IND INT ENG CO LTD
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