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Double-membrane liquid salt refining zero-emission production technology

A production process and liquid salt technology, applied in chemical instruments and methods, alkali metal sulfite/sulfite, alkali metal chloride, etc., to achieve the effects of reducing energy consumption, improving production quality, and good economic benefits

Active Publication Date: 2017-03-15
NANJING UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] To sum up, the current traditional salt production process has waste discharge problems such as waste water and salt sludge. With the improvement of environmental requirements, the problem of waste discharge and treatment has become more and more prominent.

Method used

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  • Double-membrane liquid salt refining zero-emission production technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Dissolve mineral salt with water to obtain dissolved brine, pump the brine solution to the reaction tank, add 0.01% of the total mass of sodium carbonate, and at the same time add 0.01% of the total mass of nucleating agent calcium carbonate; after 0.2 hours of reaction, pump it into the ceramic membrane ultrafiltration unit, the operating pressure is 0.1MPa, and the membrane pore size is 1μm. The ceramic membrane ultrafiltration permeate enters the nanofiltration unit; the ceramic membrane ultrafiltration concentrate enters the vacuum filter for dehydration to obtain solid salt mud, the operating pressure is 80kPa (absolute pressure), and the separation material of the filter is a porous plate with a pore size of 0.1mm . The filtrate is returned to the ceramic membrane ultrafiltration unit.

[0024] Add citric acid with a mass ratio of 1% to the salt mud for reaction, and the reaction time is 20 minutes to prepare a desulfurizer.

[0025] The operating pressure of th...

Embodiment 2

[0028] Dissolve mineral salt with water to obtain dissolved brine, pump the brine solution to the reaction tank, add potassium carbonate with a total mass of 2% of the system, and add nucleating agent calcium sulfate with a total mass of 1% at the same time; pump it into a ceramic membrane ultrafiltration unit after reacting for 3 hours , the operating pressure is 0.3MPa, and the membrane pore size is 0.03μm. The ceramic membrane ultrafiltration permeate enters the nanofiltration unit; the ceramic membrane ultrafiltration concentrate enters the vacuum filter for dehydration to obtain solid salt mud. The operating pressure is 1kPa (absolute pressure). The hole diameter is 0.1mm. The filtrate is returned to the ceramic membrane ultrafiltration unit.

[0029] A mixture of adipic acid and metasilicate (1:1 molar ratio) was added to the salt mud for reaction with a mass ratio of 15%, and the reaction time was 120 minutes to prepare a desulfurizer.

[0030] The operating pressure ...

Embodiment 3

[0033] Dissolve mineral salt with water to obtain dissolved brine, pump the brine solution to the reaction tank, add 1.5% of the total mass of sodium hydroxide, and simultaneously add 0.5% of the total mass of nucleating agent calcium carbonate; after 1.5 hours of reaction, pump it into the ceramic membrane supernatant The filter unit has an operating pressure of 0.2 MPa and a membrane pore size of 0.2 μm. The ceramic membrane ultrafiltration permeate enters the nanofiltration unit; the ceramic membrane ultrafiltration concentrate enters the vacuum filter for dehydration to obtain solid salt mud. The operating pressure is 40kPa (absolute pressure). The separation material of the filter is a metal porous plate with a pore size of 0.2 mm. The filtrate is returned to the ceramic membrane ultrafiltration unit.

[0034] Add phthalic acid with a mass ratio of 10% to the salt mud for reaction, and the reaction time is 80 minutes to prepare a desulfurizer.

[0035] The operating pre...

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Abstract

The invention discloses a double-membrane liquid salt refining zero-emission production technology. The technology comprises the following steps: dissolving mineral salt with water to obtain dissolved bittern, and adding a medicament to remove calcium and magnesium ions; removing suspended particles in the system by pottery membrane microfiltration, and letting a ultrafiltration penetrating fluid enter a nanofiltration unit; letting a ultrafiltration concentrate enter a dehydration unit to obtain solid salt slurry, and letting a filtrate return the ultrafiltration unit; modifying the obtained solid salt slurry to prepare a desulfurizer; preparing a liquid salt product from a nanofiltration penetrating fluid which is a sodium chloride solution with low content of impurities; and carrying out evaporative crystallization on a nanofiltration concentrate to obtain an industrial sodium sulfate product, and letting a evaporated condensate return to be used as mineral salt dissolving water. According to the invention, the two-membrane method of ceramic membrane and nanofiltration membrane is used for brine refining, and removal of calcium and magnesium ions, sulfate removal and membrane separation are highly integrated. By modification and activation of solid waste salt slurry, the waste is changed into a valuable thing. The salt slurry is used as a desulfurizer. Thus, reutilization of resources is realized. The technology of the invention has good economic, environmental and social benefits.

Description

technical field [0001] The invention belongs to the field of chemical separation and relates to a zero-discharge production process for refined liquid salt by a double-membrane method. Background technique [0002] Salt is an indispensable necessity in our life and an important element in industrial production. The chlor-alkali and soda ash industries, which use salt as the main raw material, provide the most basic raw materials for economic and social development, which are directly related to the national economy and people's livelihood, and are known as the "mother of industry". Salt is widely used in all aspects of production, such as agriculture, chemical industry, textile, printing and dyeing, papermaking, glass, dyestuff, metallurgy, medicine, military industry, environmental protection, building materials, daily life and other fields. It plays an important role in national economic and social development. very important role. [0003] Traditional industrial salt is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/08C01D5/00
CPCC01D3/08C01D5/00
Inventor 李卫星蔡应康邢卫红陈留平赵营峰
Owner NANJING UNIV OF TECH
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