High-salinity coal mine water standard treatment and resource utilization device and use method thereof

Abstract

The invention relates to a high-salinity coal mine water standard treatment and resource utilization device and a use method thereof. The device comprises a homogenizing adjusting tank, a high-densityclarification tank, a gravity type filter tank, a sodium bed device, an ultrafiltration device, a reverse osmosis device, a recycled water tank, an ozone reaction tank, a concentrated water high-density clarification tank, a multi-media filter, a concentrated water weak acid resin bed, a concentrated water ultrafiltration device, a nanofiltration device, a nanofiltration produced water reverse osmosis device, a strong brine tank, a nanofiltration produced water evaporation concentration device, a sodium carbonate decahydrate freezing crystallization device, a sodium chloride evaporation crystallization device, an impure salt crystallization device, a nanofiltration concentrated water tank, a nanofiltration concentrated water evaporation concentration device, a sodium sulfate decahydrate freezing crystallization device, a resin regeneration waste liquid storage tank, a calcium sulfate settling tank, a calcium sulfate dehydrator and the like. The device has the advantages that the structural design is reasonable, consumption of softening agents for mine water desalination treatment is reduced, the system reliability is improved, the additional value of salt products is increased, and maximum utilization of resources is achieved.

Description

technical field [0001] The invention relates to the technical field of coal mine water treatment, in particular to a high-salinity coal mine well water standard treatment and resource utilization device and a use method thereof. Background technique [0002] A large amount of mine water will be produced in coal mine production. The sources of coal mine water in my country are different. According to the characteristics of pollutants in mine water, it can generally be divided into: clean mine water, mine water containing suspended matter, and high salinity mine water. , acidic mine water, alkaline mine water, etc. Among them, high salinity mine water refers to the salt content in water > 1000mg / L. Most of the coal mines in my country are low organic matter and high salinity, and the salinity content is mostly 1000 Between -3000mg / L, a small amount of more than 4000mg / L, the salt content in water mainly comes from Ca 2+ 、 Mg 2+ 、 Na + , SO 4 2- 、 Cl - 、HCO 3 - Plas...

AI Technical Summary

Problems solved by technology

[0004] 1. The consumption of softening agent is large, the cost is high, and the amount of sludge generated is large. During the softening process, considering the price of the agent, a large amount of lime is usually added, which will lead to the generation of a large amount of CaCO 3 and Mg(OH) 2 Precipitate

For permanent hardness, it is often necessary to increase the supplementary Na 2 CO 3 , while for negative hardness, it is necessary to increase the CaCl 2 or CaSO 4 Increase the hardness in water or remove it by adding acid to neutralize + degassing, and both will bring SO 4 or Cl - ions, increase the system load of evaporative crystallization, and the former will also increase the amount of sludge

In addition, caustic soda is sometimes used in softening agents, but the high price of caustic soda will greatly increase the operating cost of the system (lime price 500-800 yuan / ton, solid caustic soda price 2500-3000 yuan / ton), so caustic soda is generally used as lime It is used in occasions where there is a certain requirement for the supplementation of sludge or there is a certain limit on sludge production

[0005] 2. The design of the membrane system is complex. In addition to the previous reverse osmosis concentration and nanofiltration salt separation, the concentrated water of nanofiltration needs to be further concentrated by membrane. The design of the membrane system is complicated, and the material balance is not easy to grasp;

[0006] 3. For water quality fluctuations, especially SO 4 The ratio fluctuation of / Cl is relatively sensitive, and once SO 4 Large fluctuations in / Cl will directly affect the treatment effect of subsequent salt separation, secondary concentration and evaporation crystallization

[0007] 4. The system is complicated and the investment is high, but the added value of the finished salt is too low. The system can only produce sodium sulfate and sodium chloride products. The general market price is only 100-300 yuan / ton. The price is too low and basically not economical. The benefits can be said, but in some specific areas, salt also has sales problems. For example, sulfate is generally used in industries such as soda sulfide, detergent, printing and dyeing, and papermaking. However, there are few enterprises of this type in Inner Mongolia and Northwest China. Shipping from other provinces is strictly managed and the shipping costs are high, so the gains outweigh the losses

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