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Zero-discharge treatment method and system for high-carbonate mine water

A treatment method, mine water technology, applied in the field of water treatment, can solve the problem of high salt content in wastewater, and achieve the effect of simple process flow, high stability and high value

Pending Publication Date: 2020-12-22
CHINA COAL TECH & ENG GRP HANGZHOU ENVIRONMENTAL PROTECTION INST
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Problems solved by technology

This device greatly reduces the adhesion damage of high-temperature molten salt to the furnace wall, but the salt content in the treated wastewater is still high and needs further treatment

Method used

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specific Embodiment approach 1

[0053] The core of the present invention is to provide a zero-discharge treatment method for high-carbonate mine water, a process flow chart of a specific embodiment is shown in figure 1 , which is referred to as the first embodiment, the method includes the following steps:

[0054] Step a, decarbonization; the mine water is preheated to a temperature of 85°C ± 5°C, and enters the decarbonization tower for stripping and decarbonization to obtain high-salt water and CO-containing salt water with sodium carbonate and sodium chloride as the main components. 2 mixed steam;

[0055] Step b, evaporation and concentration; the effluent in step a passes through the buffer tank, mixes with the effluent of the primary evaporator, and then enters the primary heat exchanger, and the superheated material after heat exchange enters the primary evaporator for flash evaporation to obtain an evaporation concentrate and secondary steam, the temperature of the evaporated concentrate is control...

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Abstract

The invention relates to a high-carbonate mine water zero-emission treatment method and system. The system comprises: a decarburization unit for converting bicarbonate radicals in high-carbonate minewater into carbonate radicals and removing CO2 dissolved in the mine water; an evaporation and concentration unit for evaporating and concentrating the decarburized mine water to obtain an evaporationand concentration solution containing sodium chloride with the mass concentration of 9-11.8% and sodium carbonate with the mass concentration of 18-20.5%; a cooling crystallization unit for cooling,crystallizing and centrifugally separating the evaporation and concentration solution to obtain sodium carbonate decahydrate and a frozen mother liquor; an evaporative crystallization unit for evaporating, concentrating and centrifugally separating the frozen mother liquor to obtain sodium chloride and an evaporated mother liquor; and a drying unit for drying the evaporated mother liquor discharged by the evaporative crystallization unit to obtain miscellaneous salt. According to the method, sodium carbonate and sodium chloride in high-carbonate mine water can be recycled with low cost and high efficiency, the environmental protection pressure of enterprises is reduced, the treatment cost of the high-salt mine water is reduced, and comprehensive utilization of wastewater resources is realized.

Description

technical field [0001] The invention relates to a method and system for treating mine water, in particular to a method and system for treating high-carbonate mine water with zero discharge, and belongs to the technical field of water treatment. Background technique [0002] With the rapid development of the coal industry, a large amount of wastewater is discharged in the process of mining coal. If it is discharged directly without treatment, it will inevitably cause serious pollution to the environment and cause a large waste of resources. Because this kind of wastewater contains a lot of salt, in order to improve the recovery rate of industrial wastewater, combined treatment processes such as pretreatment, ultrafiltration membrane, and reverse osmosis membrane are generally used to produce product water (accounting for about 90% of the influent) and high-salt wastewater. (accounting for about 10% of the influent water) two kinds of effluent water quality, in which the produ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C01D3/06C01D3/14C01D7/22C01D7/24C01D7/12
CPCC02F9/00C01D3/06C01D3/14C01D7/22C01D7/24C01D7/12C02F1/048C02F1/041C02F1/20C02F2001/5218C02F1/38C02F2301/08C02F2209/02C02F2209/03
Inventor 郭中权毛维东杨久利肖艳周如禄高杰张军
Owner CHINA COAL TECH & ENG GRP HANGZHOU ENVIRONMENTAL PROTECTION INST
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