Salt preparing method and system

A salt crystal and saturation technology, which is applied in the field of salt production system, can solve the problems of increased cost and increased processing technology, and achieve the effects of reduced cleaning frequency, high purity, and prolonged growth time

Active Publication Date: 2018-11-02
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The additives mentioned in it will introduce new substances into the raw water, requiring additional subsequent treatment processes, resulting in increased costs

Method used

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  • Salt preparing method and system

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Effect test

Embodiment 1

[0055] Synthetic brine-containing simulated raw material water is prepared in a buffer tank, wherein the brine is a mixed solution of sodium sulfate and sodium chloride at 10°C (the temperature of the brine is determined by preparing the brine and the crystallization effluent obtained from the subsequent crystallization separation process) heat exchange treatment to control), the massfraction of sodium sulfate is 8%, and the massfraction of sodium chloride is 2%. According to the Phreeqc simulation, the temperature when the sodium sulfate in the brine is saturated is 10°C, so the brine is a saturated solution of sodium sulfate at this time, and there is no salt precipitation. Add solid sodium sulfate to the brine in a buffer tank to obtain a buffer solution, wherein, based on 1L of buffer solution, the amount of sodium sulfate seed crystals added is 1000mg, and the buffer solution is pumped at a flow rate of 3m / s while stirring. Pour into a coil-type stainless steel heat excha...

Embodiment 2

[0057] Synthetic brine-containing simulated raw material water was prepared in a buffer tank, wherein the brine was a mixed solution of sodium sulfate and sodium chloride at 25°C, the mass fraction of sodium sulfate was 10%, and the mass fraction of sodium chloride was 2%. According to the Phreeqc simulation, there is no salt precipitation in the brine at 25°C. Add the solid-liquid mixed saturated solution of the sodium sulfate crystalline salt that subsequent crystallization separation process obtains to this containing brine in buffer tank, obtain buffer solution, wherein, in 1L buffer solution, the addition amount of sodium sulfate seed crystal is 800mg, while While stirring, pump the buffer solution at a flow rate of 4 m / s into a coiled stainless steel heat exchanger with a pipe diameter of 6 mm for cooling. The refrigerant in the heat exchanger is 20% by weight ethylene glycol solution at 0°C. After the buffer solution is cooled by a heat exchanger, the temperature drops ...

Embodiment 3

[0059] Synthetic brine-containing simulated raw material water was prepared in a buffer tank, wherein the brine was a sodium sulfate solution at 20° C., and the mass fraction of sodium sulfate was 9%. According to the Phreeqc simulation, there is no salt precipitation in the brine at 20°C. Add solid sodium sulfate to the brine in a buffer tank to obtain a buffer solution, wherein, based on 1L of buffer solution, the amount of sodium sulfate seed crystals added is 1500 mg, and the buffer solution is pumped at a flow rate of 5 m / s while stirring. Pour into a coil-type stainless steel heat exchanger with a pipe diameter of 6mm for cooling, and the refrigerant of the heat exchanger is frozen brine at -2°C. After the buffer solution is cooled by a heat exchanger, the temperature drops to 2° C. (at this temperature, the degree of saturation of sodium sulfate is 6% by weight), and the cooled buffer solution enters the crystallization tank for crystallization separation. The residence...

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Abstract

The invention relates to the field of water treatment, and discloses a salt preparing method and system. The method comprises the following steps: (1) adding bivalent anionic salt seed crystals to rawwater to obtain a buffering solution; (2) cooling the buffering solution; and (3) separating crystals of the cooled buffering solution to obtain bivalent anionic salt crystal salt, wherein the raw water contains dianionic salt and random single valence anion; the mass concentration of the dianionic salt in the raw water is less than the saturability of the dianionic salt under the cooling temperature in step (2); the solubility of the dianionic salt under the temperature of 0-32.4 DEG C decreases as the temperature decreases, and the average solubility of the dianionic salt within the temperature range of 0-32.4 DEG C is decreased at the rate exceeding 0.03g / DEG C. With the adoption of the method, scaling in a tube pass or on the wall of a heat exchanger in the process of cooling high-concentration saline water can be effectively reduced; and moreover, high-purity and high-average-particle-size crystal salt can be obtained; and subsequent separation is conveniently carried out.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a salt production method and a salt production system capable of effectively slowing down heat exchanger fouling. 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 crystal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/00B01D9/02
CPCB01D9/0009C01D5/00C01P2004/61C01P2006/80
Inventor 马瑞熊日华何灿霍卫东钟振成刘捷卫昶
Owner CHNA ENERGY INVESTMENT CORP LTD
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