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Self-balancing method and system of evaporative crystallization mother liquor reflux based on gypsum seed crystal process

A technology of evaporative crystallization and evaporative crystallizer, which is applied in chemical instruments and methods, water softening, water/sewage multi-stage treatment, etc., can solve problems such as increasing production costs, system impact, polluting product salt, etc., to reduce pollution, Reduce system operating costs and the effect of reducing operating costs

Active Publication Date: 2019-12-31
BEIJING GUODIAN FUTONG SCI & TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The former will cause impurities to accumulate continuously in the evaporator, polluting the product salt
The latter will pollute the environment, and at the same time cause resources to be unrecoverable and increase production costs
In addition, the salty wastewater in industrial production fluctuates greatly, which will impact the system and affect equipment operation and product quality

Method used

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  • Self-balancing method and system of evaporative crystallization mother liquor reflux based on gypsum seed crystal process

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0034] The evaporative crystallization mother liquor reflux self-balancing system based on the gypsum seed crystal process in the present embodiment includes:

[0035] evaporative crystallizer;

[0036] A pretreatment device connected to the evaporative crystallizer;

[0037] A mother liquor clarification device connected with the evaporation crystallizer and the pretreatment device.

[0038] The reflux self-balancing method of the evaporative crystallization mother liquor based on the gypsum seed crystal process of the present invention comprises the following steps:

[0039] 1) The salty wastewater enters the pretreatment device for evaporation and crystallization. The calcium ion of the salty wastewater is 800mg / L, the salt content of magnesium ion is 5000mg / L, and the water volume is 30m 3 / h; when the system starts, add Ca(OH) to the pretreatment device 2 15g / L, Na 2 SO 4 9g / L, the magnesium ion content after pretreatment is less than 100mg / L, and the molar ratio o...

Embodiment 2

[0043] The evaporative crystallization mother liquor reflux self-balancing system based on the gypsum seed crystal process in this embodiment includes:

[0044] evaporative crystallizer;

[0045] A pretreatment device connected to the evaporative crystallizer, the pretreatment device includes a first pretreatment device and a second pretreatment device;

[0046] A mother liquor clarification device connected with the evaporation crystallizer and the pretreatment device.

[0047] The method for reflux self-balancing of evaporative crystallization mother liquor based on gypsum seed crystal process of the present invention comprises the following steps:

[0048] 1) The salty wastewater enters the pretreatment device for evaporation and crystallization. The salty wastewater has a calcium ion of 2000mg / L, a magnesium ion salt content of 10000mg / L, and a water volume of 30m 3 / h; when the system starts, the first pretreatment device adds Ca(OH) 2 30g / L, add Na to the second pretr...

Embodiment 3

[0053] The evaporative crystallization mother liquor reflux self-balancing system based on the gypsum seed crystal process in this embodiment includes:

[0054] evaporative crystallizer;

[0055] A pretreatment device connected to the evaporative crystallizer, the pretreatment device includes a first pretreatment device and a second pretreatment device;

[0056] A mother liquor clarification device connected with the evaporation crystallizer and the pretreatment device.

[0057] The method for reflux self-balancing of evaporative crystallization mother liquor based on gypsum seed crystal process of the present invention comprises the following steps:

[0058] 1) The salty wastewater enters the pretreatment device for evaporation and crystallization, the salty wastewater has a calcium ion of 800mg / L, a magnesium ion salt content of 20000mg / L, and a water volume of 30m 3 / h; when the system starts, the first pretreatment device adds Ca(OH) 2 15g / L, add Na to the second pretr...

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Abstract

The invention discloses a reflow self-balance method and system thereof for evaporative crystallization mother liquor based on a gypsum crystal seed technology, and belongs to the field of wastewater treatment. The method comprises the following steps of (1) enabling saliferous wastewater to enter an evaporative crystallization pretreatment device, and adding excess medicaments capable of removing calcium-magnesium ions to the pretreatment device so as to reduce the hardness of the saliferous wastewater; (2) enabling saliferous wastewater after pretreatment to enter an evaporative crystallization machine through a circulating pipe, and outwards draining mother liquor quantitatively so that a certain ion concentration is maintained in the evaporative crystallization machine; and (3) clarifying the outwards-drained mother liquor, enabling solid salt to return to the evaporative crystallization machine for recovering, and enabling a supernatant to reflow to the pretreatment device to form self-balance of the medicaments in the system. Through the adoption of the method disclosed by the invention, the pollution caused by draining the mother liquor can be effectively reduced, secondary utilization of effective components in the mother liquor can also be realized, and the operating cost of the system is reduced.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a self-balancing method and system for reflux and self-balancing evaporation crystallization mother liquor based on a gypsum seed crystal process. Background technique [0002] In the evaporation crystallization system, in order to prevent the hardness in the brine from being too high, causing scaling in the evaporation equipment, and affecting the quality of the product salt, it is necessary to pre-treat the raw brine with chemicals to remove the hardness. In the evaporator, as the concentration proceeds, the concentration of each ion index will increase continuously. In order to maintain the concentration of each ion in the evaporator within a safe range, it is necessary to continuously discharge the concentrated mother liquor. This part of the mother liquor is usually discharged directly, which not only pollutes the environment, but also cannot be recycled becaus...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10
CPCC02F1/048C02F1/52C02F1/58C02F1/62C02F5/02C02F5/06C02F9/00C02F2301/08
Inventor 樊兆世赵崇李若征滕济林马文明杨万强张培林李星伟
Owner BEIJING GUODIAN FUTONG SCI & TECH DEV