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Continuous salt production method and system

A nanofiltration and concentrated water technology, applied in the purification of alkali metal sulfite/sulfate, calcium/strontium/barium sulfate, alkali metal halide purification, etc., can solve the problem of high investment and energy consumption, chromaticity of crystal salt and purity effects, to achieve the effects of reducing operating costs, improving heat utilization efficiency, and improving recovery rates

Active Publication Date: 2018-01-23
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 production method and system
  • Continuous salt production method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] combine figure 1 , This embodiment is used to illustrate the continuous salt production method of the present invention.

[0079] In this example, the nanofiltration unit is a one-stage one-stage nanofiltration system composed of six GE SWSR-400 nanofiltration membrane elements connected in series, and the crystallization separation unit includes a 1.5m 3 The stainless steel container and centrifugal separation device, the barium denitrification crystallization unit includes a volume of 0.3m 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:

[0080] (1) Set the flow rate to 3.3m 3 / h, the temperature is the synthetic brine shown in Table 1 of 32.4 ℃ as raw material water and the flow rate from step (5) is 2.7m 3 / h, the reflux low temperature crystallization effluent at 16°C is mixed, and the mixed nanofiltration influent is obtained and 6.0m 3 The total flow rate p...

Embodiment 2

[0093] This embodiment is used to illustrate the continuous salt production method of the present invention.

[0094] In this example, the nanofiltration unit is a one-stage one-stage nanofiltration system composed of six GE SWSR-400 nanofiltration membrane elements connected in series, and the crystallization separation unit includes a 2.0m 3 The stainless steel container and centrifugal separation device, the barium denitrification crystallization unit includes a volume of 0.7m 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:

[0095] (1) Set the flow rate to 3.75m 3 / h, temperature is the synthetic brine shown in table 2 of 30 ℃ 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 refluxed low-temperature crystallization effluent to obtain mixed nanofiltration influent and 7.0m 3 The total flow rate per hour and ...

Embodiment 3

[0110] This embodiment is used to illustrate the continuous salt production method of the present invention.

[0111] In this example, the nanofiltration unit is a one-stage one-stage nanofiltration system composed of six GE DSL NF8040 nanofiltration membrane elements in series, and the crystallization separation unit includes a 0.75m 3 The stainless steel container and centrifugal separation device, the barium denitrification crystallization unit includes a volume of 0.15m 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:

[0112] (1) Set the flow rate to 3.125m 3 / h, temperature is the synthetic brine shown in Table 3 of 18.1 ℃ as raw material water and the flow rate from step (5) is 1.375m 3 / h, the reflux low temperature crystallization effluent at a temperature of 8°C is mixed, and the mixed nanofiltration influent is obtained and 4.5m 3 The total flow rate per hour and ...

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Abstract

The invention relates to the field of water treatment, and discloses a continuous salt production method and system. The method comprises: (1) performing nanofiltration separation to salt-containing water to obtain nano-filtered product water and nano-filtered concentrated water; (2) performing heat transfer between the nano-filtered concentrated water and low-temperature crystallization product water obtained from the step (4) to obtain cooled nano-filtered concentrated water and warmed crystallization product water, and dividing the warmed crystallization product water into reflux crystallization product water and low temperature crystallization water product water concentrated water; (3) cooling the nano-filtered concentrated water; (4) performing low temperature crystallization separation to the cooled nano-filtered concentrated water to obtain crystallization product water and crystallization salt, and when the content X% of divalent anion salt in raw water is less than 5wt%, allowing R1<X / (5-X) to be satisfied, wherein R1 is the volume flow ratio of the low temperature crystallization water product water concentrated water to the nano-filtered product water; and (5) performing denitration crystallization to the low temperature crystallization water product water concentrated water through a barium method. The salt-containing water contains raw water and reflux crystallization product water. The method allows high-purity single-component salt to be continuously produced and is low in energy consumption and cost.

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): C01D3/14C01D5/16C01F11/46
Inventor 何灿卫昶熊日华霍卫东马瑞
Owner CHNA ENERGY INVESTMENT CORP LTD
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