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Salt production method and salt production system

A technology of crystallization salt and crystallization, which is applied in the field of salt production methods and salt production systems, can solve the problems of limited membrane concentration recovery rate and difficult disposal of solid miscellaneous salt, achieve good economic value and use value, increase water recovery rate, reduce load effect

Active Publication Date: 2016-11-09
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Existing zero liquid discharge processes generally have prominent problems such as limited recovery rate of membrane concentration and difficult disposal of solid miscellaneous salts

Method used

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  • Salt production method and salt production system
  • Salt production method and salt production system
  • Salt production method and salt production system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0097] to combine figure 1 , the present embodiment is used to illustrate the salt making method of the present invention.

[0098] The reverse osmosis unit used in this embodiment is a one-stage one-stage reverse osmosis system including 3 parallel membrane shells, and 6 series-connected DOW BW30FR-400 reverse osmosis membrane elements are housed in each membrane shell; the first crystallization separation unit includes A total volume of 12.5m 3 The reaction clarifier and centrifugal separation device; the cation exchange unit is a volume of 0.15m 3 , A cation exchanger filled with DOWEXMAC-3 weak acid cation exchange resin; the evaporation unit is a heat exchange area of ​​20m 2 The mechanical compression evaporator; the second crystallization separation unit includes a heat exchange area of ​​1.0m 2 The forced circulation evaporation crystallizer and centrifugal separation device; the third crystallization separation unit includes a heat exchange area of ​​0.2m 2 The fo...

Embodiment 2

[0111] to combine figure 1 , the present embodiment is used to illustrate the salt making method of the present invention.

[0112] The reverse osmosis unit used in this embodiment is a one-stage one-stage reverse osmosis system including 3 parallel membrane shells, and 6 series-connected DOW BW30FR-400 reverse osmosis membrane elements are housed in each membrane shell; the first crystallization separation unit includes A total volume of 12.5m 3 The reaction clarifier and centrifugal separation device; the cation exchange unit is a volume of 0.15m 3 , A cation exchanger filled with DOWEXMAC-3 weak acid cation exchange resin; the evaporation unit is a heat exchange area of ​​20m 2 The mechanical compression evaporator; the second crystallization separation unit includes a volume of 0.15m with insulation layer 3 stainless steel container and centrifugal separation device; the third crystallization separation unit includes a heat exchange area of ​​1.0m 2 The forced circulat...

Embodiment 3

[0126] According to the method of Example 2, the difference is that in step (6), all the third crystal concentrated water is supplied to the evaporative crystallizer as the system concentrated water for evaporative crystallization treatment, specifically, step (5) and step (6 )for:

[0127] (5) Set the flow rate to 0.06m 3 / h, the concentrated water of the evaporation unit with a temperature of 105°C is cooled to 0°C by a spiral tube heat exchanger, and then supplied to the second crystallization separation unit as the second crystallization feed water, and the cooling crystallization separation process is carried out at 0°C. Because the solubility of sodium sulfate drops sharply at low temperature, part of sodium sulfate is separated out, adopts centrifugal separation device to carry out centrifugation after processing, obtains sodium sulfate crystalline salt (after deducting crystal water, is 11.6kg / h). At the same time, the obtained flow rate is 0.06m 3 / h, the second cry...

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Abstract

The invention relates to the field of water treatment, and discloses a salt production method and a salt production system. The method comprises the following steps: carrying out reverse osmosis treatment on brackish water to obtain reverse osmosis concentrate water and reverse osmosis produced water; carrying out primary crystallizing separation treatment on the reverse osmosis concentrate water to obtain primary crystal salt and primary crystal concentrate water, and dividing the primary crystal concentrate water into primary reflux crystal outlet water and cation exchange inlet water; carrying out cation exchange treatment on the cation exchange inlet water to obtain cation exchange outlet water; carrying out secondary crystallizing separation treatment on the cation exchange outlet water to obtain secondary crystal salt and secondary crystal concentrate water; and carrying out tertiary crystallizing separation treatment on the secondary crystal concentrate water to obtain tertiary crystal salt and tertiary crystal concentrate water. The method and the system are adopted to produce the highly-pure single component salt, and the method and the system have the advantages of high water recovery rate, low cation exchange load, and great reduction of the impurity salt treatment cost, the investment cost and the running cost.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a salt making method and a salt making system. Background technique [0002] With the continuous improvement of environmental protection requirements, contradictions such as insufficient water resources and limited environmental capacity have become increasingly prominent. In the production processes of petrochemical, coal chemical, electric power, steel and seawater desalination, a large amount of salty wastewater will be produced. In order to reduce the amount of external drainage and improve the efficiency of water use, currently salty wastewater is generally treated by reverse osmosis-based membrane method and then reused, which improves the efficiency of water use to a certain extent. Where zero liquid discharge is required, the concentrated reverse osmosis water is further processed by evaporation and crystallization to obtain distilled water and solid miscellaneous salts. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/06C01D5/00C01F11/46C02F9/10
CPCC01D3/06C01D5/00C01F11/46C02F1/04C02F1/441C02F9/00C02F2001/425C02F2301/04C02F2301/08C02F2303/22
Inventor 熊日华卫昶陈权霍卫东
Owner CHNA ENERGY INVESTMENT CORP LTD
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