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Continuous salt making method and continuous salt making system

A nanofiltration and concentrated water technology, applied in the field of water treatment, can solve the problems of crystalline salt color and purity, high investment and energy consumption, etc., to improve heat utilization efficiency, reduce energy consumption and investment costs, and increase recovery rate Effect

Active Publication Date: 2017-08-04
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method not only has the disadvantages of high investment and energy consumption, but also the color and purity of the obtained crystalline salt are seriously affected in the presence of organic matter

Method used

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  • Continuous salt making method and continuous salt making system
  • Continuous salt making method and continuous salt making system
  • Continuous salt making method and continuous salt making system

Examples

Experimental program
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Effect test

Embodiment 1

[0074] to combine figure 1 , This embodiment is used to illustrate the continuous salt production method of the present invention.

[0075] In this example, the nanofiltration separation unit is a one-stage one-stage nanofiltration system composed of six GE SWSR-400 nanofiltration membrane elements connected in series. The crystallization separation unit includes a 1.5m 3 Stainless steel container and centrifugal separation device, the feed water flow rate of raw water is 3.3m 3 / h, the specific process is as follows:

[0076] (1) Set the flow rate to 3.3m 3 / h, the temperature is 32.4 ℃ synthetic brine shown in table 1 as raw material water and the flow rate from step (5) is 2.7m 3 / h, the temperature of 16 ° C reflux crystallization effluent is mixed, and the mixed nanofiltration influent is obtained and 6.0m 3 The total flow rate per hour and the temperature of 25°C were supplied to the nanofiltration separation unit, and the nanofiltration separation treatment was perf...

Embodiment 2

[0088] This embodiment is used to illustrate the continuous salt production method of the present invention.

[0089] In this example, the nanofiltration separation unit is a one-stage one-stage nanofiltration system composed of six GE SWSR-400 nanofiltration membrane elements connected in series. The crystallization separation unit includes a 2.0m 3 Stainless steel container and centrifugal separation device, the feed water flow rate of raw water is 3.75m 3 / h, the specific process is as follows:

[0090] (1) Set the flow rate to 3.75m 3 / h, the temperature is that the synthetic brine shown in table 2 of 30 ℃ is as raw material water and the flow that obtains from step (6) is 3.25m 3 / h, heated up to 30°C and mixed with reflux crystallization effluent to obtain mixed nanofiltration influent and 7.0m 3 The total flow rate per hour and the temperature of 30°C were supplied to the nanofiltration separation unit, and the nanofiltration separation treatment was performed at 30°...

Embodiment 3

[0103] This embodiment is used to illustrate the continuous salt production method of the present invention.

[0104] In this example, the nanofiltration separation unit is a one-stage one-stage nanofiltration system composed of six GE DSL NF8040 nanofiltration membrane elements connected in series. The crystallization separation unit includes a 0.75m 3 Stainless steel container and centrifugal separation device, the inflow flow rate of raw water is 3.125m 3 / h, the specific process is as follows:

[0105] (1) Set the flow rate to 3.125m 3 / h, the temperature is 18.1 ℃ synthetic brine shown in table 3 as raw material water and the flow from step (5) is 1.375m 3 / h, the temperature is 8 ℃ reflux crystallization effluent is mixed, and the mixed nanofiltration influent is obtained and 4.5m 3 The total flow rate per hour and the temperature of 15°C were supplied to the nanofiltration separation unit, and the nanofiltration separation treatment was performed at 15°C. Among them...

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Abstract

The invention relates to the field of water treatment and discloses a continuous salt making method and a continuous salt making system. The continuous salt making method comprises the following steps: (1) carrying out nanofiltration separation on salt-containing water to obtain nanofiltration producing water and nanofiltration concentrated water; (2) carrying out heat exchange on the nanofiltration concentrated water and crystallization producing water in step (4) to obtain the nanofiltration concentrated water subjected to temperature reduction and the crystallization producing water subjected to temperature rise, and dividing the crystallization producing water subjected to the temperature rise into backflow crystallization producing water and system concentrated water; (3) cooling the nanofiltration concentrated water subjected to the temperature reduction to obtain cooled nanofiltration concentrated water; and (4) carrying out crystallization separation on the cooled nanofiltration concentrated water to obtain the crystallization producing water and a crystalline salt, wherein the salt-containing water is prepared from raw material water and the backflow crystallization producing water, a relationship that R1 is smaller than X / (5-X) is satisfied when the mass content X% of bivalent anionic salt in the raw material water is smaller than 5 percent, and R1 is a volume flow ratio of the system concentrated water to the nanofiltration producing water. By adopting the method and the system provided by the invention, a high-purity single component salt can be continuously produced, and the energy consumption and the investment cost can be greatly lowered.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a continuous salt production method and a continuous salt production 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 an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/14C01D5/16
CPCC01D3/14C01D5/16C01P2006/80
Inventor 熊日华卫昶霍卫东马瑞何灿
Owner CHNA ENERGY INVESTMENT CORP LTD
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