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Device and method for zinc sulfate wastewater crystal separation treatment

A crystallization separation, zinc sulfate technology, applied in centrifugal separation water/sewage treatment, water/sewage multi-stage treatment, heating water/sewage treatment and other directions, can solve the problems of high energy consumption and complex structure, achieve simple equipment and process short effect

Inactive Publication Date: 2013-05-08
衡阳美仑颜料化工有限责任公司
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0002] With the rapid development of my country's industry, the production of zinc sulfate is accompanied by a large amount of industrial wastewater. How to use advanced technology to treat industrial wastewater, turn waste into treasure, realize clean production and develop circular economy is placed in front of zinc sulfate production enterprises At the same time, the internal wastewater treatment process of the enterprise should be short and reliable, and convenient and feasible as the main goal. At present, most of the zinc sulfate wastewater recovery devices produced after the electrolysis of zinc flow acid are complex in structure and high in energy consumption.

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  • Device and method for zinc sulfate wastewater crystal separation treatment

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Embodiment 1

[0012] Example 1: The pretreated zinc sulfate wastewater is exchanged with the condensed water through a plate heat exchanger to recover the heat of the condensed water, increase the temperature of the raw wastewater entering the tank, and effectively reduce the consumption of steam. The heated raw wastewater is added to the second Two forced circulation evaporators 302, control the temperature of the feed liquid at 90 degrees, and discharge it to the third forced circulation evaporator 303 after evaporation and concentration, control the temperature of the feed liquid at 70 degrees, and discharge it to the fourth forced circulation evaporator 304 after evaporation and concentration. The temperature of the feed liquid is 50 degrees, at this time, potassium chloride is precipitated as the temperature decreases, and the mother liquor of the precipitated potassium chloride is discharged to the first forced circulation evaporator 301, and the temperature of the feed liquid is contro...

Embodiment 2

[0013] Example 2: The pretreated zinc sulfate wastewater is exchanged with the condensed water through a plate heat exchanger to recover the heat of the condensed water, increase the temperature of the raw wastewater entering the tank, and effectively reduce the consumption of steam. The heated raw wastewater is added to the second Two forced circulation evaporators 302, control the temperature of the feed liquid at 60 degrees, and discharge it to the third forced circulation evaporator 303 after evaporation and concentration, control the temperature of the feed liquid at 40 degrees, discharge it to the fourth forced circulation evaporator 304 after evaporation and concentration, control The temperature of the feed liquid is 20 degrees, at this time, potassium chloride is precipitated as the temperature decreases, and the mother liquor of the precipitated potassium chloride is discharged to the first forced circulation evaporator 301, and the temperature of the feed liquid is co...

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Abstract

The invention discloses a device and a method for zinc sulfate wastewater crystal separation treatment. The method comprises the following steps of: preheating raw material, treating the liquid through flash concentration crystallization to separate out the potassium chloride, preheating the crystallized liquid, and concentrating and crystallizing the preheated liquid, separating out sodium chloride, circulating repeatedly, until separating out all the potassium chloride and sodium chloride. The method is simple in process, reliable in operation and very suitable for treatment of wastewater of zinc sulfate factory.

Description

technical field [0001] The invention relates to the technical field of industrial wastewater treatment, in particular to a device and method for crystallization and separation treatment of zinc sulfate wastewater. Background technique [0002] With the rapid development of my country's industry, the production of zinc sulfate is accompanied by a large amount of industrial wastewater. How to use advanced technology to treat industrial wastewater, turn waste into treasure, realize clean production and develop circular economy is placed in front of zinc sulfate production enterprises At the same time, the internal wastewater treatment process of the enterprise should be short and reliable, and convenient and feasible as the main goal. At present, most of the existing zinc sulfate wastewater recovery devices produced after electrolyzing the acid flow zinc are complex in structure and high in energy consumption. Contents of the invention [0003] The purpose of the present inven...

Claims

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Application Information

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IPC IPC(8): C02F9/10C01D3/04C02F1/06C02F1/38
Inventor 王全归邱奕翔李文波肖可良
Owner 衡阳美仑颜料化工有限责任公司