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A method for comprehensive utilization of brine and co-production of high-purity water salt

A high-purity water and brine technology, applied in the field of salt chemical industry, can solve the problems of low mass transfer efficiency and low absorption rate, and achieve the effects of increasing mass transfer area, reducing production energy consumption, and improving mass transfer effect

Active Publication Date: 2019-04-05
山东夙沙高科生物有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, membrane separation technology has not been applied industrially in the field of salt chemical technology, mainly because of low mass transfer efficiency and low absorption rate.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] a. Using underground brine as raw material, continuously feed flue gas for decalcification treatment, and then obtain softened brine through clarification, sand filtration, and ultrafiltration operations, and dry the filter cake to obtain solid calcium carbonate.

[0030] b. Add 8 mg / L antiscalant polyacrylic acid to the softened brine, and send it to the nanofiltration device, and obtain nanofiltration concentrated water and refined brine respectively after nanofiltration membrane nanofiltration, and concentrate and crystallize the nanofiltration concentrated water to obtain magnesium sulfate .

[0031] c. Concentrate the refined brine at a flow rate of 0.25m / s through the concentrated membrane assembly to obtain a concentrated feed liquid. The concentrated membrane assembly includes a heat exchange assembly and a microporous membrane assembly. The heat exchange assembly includes a heat-conducting film tube and a membrane shell. The microporous membrane assembly includ...

Embodiment 2

[0035] a. Using underground brine as raw material, continuously feed flue gas for decalcification treatment, and then obtain softened brine through clarification, sand filtration, and ultrafiltration operations, and dry the filter cake to obtain solid calcium carbonate.

[0036] b. Add 10mg / L antiscalant polyacrylic acid to the softened brine, send it into the nanofiltration device, and obtain nanofiltration concentrated water and refined brine after nanofiltration membrane nanofiltration. The number of nanofiltration membranes is 4. , the pressure during nanofiltration is 1.45MPa, Mg 2+ Rejection rate 97.8%, SO 4 2- The rejection rate is 100%, and the nanofiltration concentrated water is concentrated and crystallized to obtain magnesium sulfate.

[0037] c. Concentrate the refined brine through the concentrated membrane assembly at a flow rate of 0.28m / s to obtain a concentrated feed liquid. The concentrated membrane assembly includes a heat exchange assembly and a microporou...

Embodiment 3

[0041] a. Using underground brine as raw material, continuously feed flue gas for decalcification treatment, and then obtain softened brine through clarification, sand filtration, and ultrafiltration operations, and dry the filter cake to obtain solid calcium carbonate.

[0042] b. Add 8mg / L antiscalant polyacrylic acid to the softened brine, and send it to the nanofiltration device. After nanofiltration with nanofiltration membrane, nanofiltration concentrated water and refined brine are obtained respectively. The number of nanofiltration membranes is 4. , the pressure during nanofiltration is 1.42MPa, Mg 2+ Rejection rate 95.9%, SO 4 2- The rejection rate is 100%, and the nanofiltration concentrated water is concentrated and crystallized to obtain magnesium sulfate.

[0043] c. Concentrate the refined brine through the concentrated membrane assembly at a flow rate of 0.30m / s to obtain a concentrated feed liquid. The concentrated membrane assembly includes a heat exchange a...

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PUM

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Abstract

The invention discloses a method for co-producing high-purity water and salt through comprehensive utilization of brine. The method includes the following steps that a, the brine serves as a raw material, flue gas is continuously introduced, and calcium carbonate is obtained after precipitation and drying; b, a scale inhibitor is added into the softened brine, nanofiltration thick water and refined brine are obtained after nanofiltration of a nanofiltration membrane, and the nanofiltration thick water is concentrated and crystallized to obtain magnesium sulfate; c, the refined brine is concentrated through a concentration membrane assembly to obtain concentrated feed liquid; b, the concentration feed liquid obtained through the concentration membrane assembly directly enters a low-temperature steam compression and rectification device and sequentially passes through multiple vacuum flash tanks to obtain salt slurry, and the salt slurry is filter-pressed and dehydrated to obtain sodium chloride; e, condensate water in the step c and flash steam in the step d are condensed and then collected and purified to obtain high-purity water. The method is used for comprehensive utilization of the brine, calcium carbonate, magnesium sulfate, sodium chloride and other chemical products are obtained, a large amount of desalted water is by-produced, the brine is developed and utilized to the maximum degree, production efficiency is improved, and production energy consumption is reduced.

Description

technical field [0001] The invention relates to the technical field of salt chemical industry, in particular to a technology for comprehensive utilization of brine and joint production of high-purity salt. Background technique [0002] Underground brine is a very important mineral resource, which has a prominent position in the economic society of coastal areas. The marine chemical industry formed by relying on the development and utilization of brine resources is a pillar industry of the local economy, which has effectively stimulated the sustainable development of the local economy. Rapid growth. [0003] The salt production step after extracting bromine from brine, at present, most of the salt produced in the northern coastal area of ​​Weifang adopts the sun drying method and the distillation method. The benefit is low. Moreover, the produced salt contains many impurities, so it can only be used for industrial salt or food, and cannot be used as high-purity salt. At pre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/00C01F11/18C01F5/40C01D3/06
CPCC01D3/06C01F5/40C01F11/18C02F1/001C02F1/02C02F1/06C02F1/442C02F1/447C02F5/08C02F9/00
Inventor 王德强王彦玲杨树仁闫雪王慧段升芹
Owner 山东夙沙高科生物有限公司
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