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A high recovery process for treating mine water with high sulfate and high hardness

A high-sulfate, high-recovery technology, applied in mining wastewater treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. , to prevent sulfate scale formation, reduce turbidity, and prolong service life

Active Publication Date: 2017-08-11
NANJING JIUSI HIGH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of low recovery rate of the current mine water treatment process, difficulty in meeting the discharge standard, insufficient stability of the technology, and high cost.

Method used

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  • A high recovery process for treating mine water with high sulfate and high hardness
  • A high recovery process for treating mine water with high sulfate and high hardness
  • A high recovery process for treating mine water with high sulfate and high hardness

Examples

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Effect test

Embodiment 1

[0032] The water gushing out of an iron mine in Anhui belongs to SO4 2- -Ca 2+ Type water, rich in a large amount of sulfate and hardness, is used for industrial circulating cooling water after treatment, and the treated water volume is 450m³ / h. After the mine is adjusted by the primary sedimentation tank, it enters the ultrafiltration membrane system. A tubular ceramic ultrafiltration membrane with an average pore size of 100nm is used to remove bacteria and reduce turbidity through ultrafiltration. Cross-flow filtration is used. The transmembrane pressure difference is 0.5 MPa. Use ultrafiltration and ultrafiltration product water to carry out backwashing by automatically adding 5 mg / L NaClO. The backwashing sequence is air intake (air scrubbing)—drainage—upper backwash (simultaneous air intake)—lower backwash—forward washing, The backwash interval is 30min, the upper backwash time is 20s, the intake pressure is 0.25MPa, and the intake air volume is 5Nm 3 / h, water intake ...

Embodiment 2

[0036] Mine gushing water of an iron mine in Anhui and part of surface dust removal sewage are treated for general domestic water or public utility water. The treated water volume is 810m³ / h. According to the process, the primary sedimentation is adjusted first, and the filter cloth filter is used to filter out suspended solids. The primary sedimentation adjustment tank is uniformly distributed and mixed by hydraulic means. The filter cloth filter is a mobile vertical sheet type. The pore size of the filter cloth is about 10 μm. The operation is fully automated and can be continuously filtered. The SS removal rate is 80%. The effluent from the primary sedimentation tank enters the self-cleaning filter, and the effluent enters the hollow fiber ceramic ultrafiltration membrane with an average pore size of 50nm. Cross-flow filtration is used, the transmembrane pressure difference is 0.3 MPa, and ultrafiltration product water is used for backwashing by automatically adding 5 mg / L N...

Embodiment 3

[0040] The mine water of a large iron mine in Anhui gushes out, and after treatment, it is used for ore dressing and cooling water for mining equipment. The water volume of the pretreatment system is 1000m³ / h. According to the process, it is first adjusted by primary sedimentation, and then adjusted to pH 6.7 before entering the self-cleaning filter. The effluent is filtered by a hollow fiber polyvinylidene fluoride ultrafiltration membrane with an average pore size of 30nm. Cross-flow filtration is used, the transmembrane pressure difference is 0.08 MPa, and ultrafiltration product water is used for backwashing by automatically adding 6 mg / L NaClO. Intake)—bottom backwash—forward wash, the backwash interval is 50 minutes, the upper backwash time is 60s, the intake pressure is 0.2MPa, and the intake volume is 7Nm 3 / h, water intake 120L / m 2 • h, the backwash time is 80s, and the backwash time is 25s. The ultrafiltration effluent enters the special membrane system after addin...

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Abstract

The invention relates to a high-recovery process for treating mine water with high sulfate and high hardness. The process includes an ultrafiltration membrane system and a special membrane system. A pretreatment system is provided before the ultrafiltration membrane system. sink regulation system. After the mine water is treated by the pretreatment system such as the primary sedimentation adjustment system, the effluent enters the ultrafiltration membrane system, the ultrafiltration effluent is added with a membrane protective agent and enters the special membrane system, and the ultrafiltration concentrated water is returned to the primary sedimentation adjustment system. The complex salts and other substances in the water are removed, the effluent enters the deployment system for reuse, and the concentrated water undergoes deep recovery treatment. The mine water reuse process of the invention has strong selectivity, can process mine water of different water quality, realizes the recovery of water resources in the mining industry, and the recovery rate is over 70%.

Description

technical field [0001] The invention relates to the reuse treatment of mine water, in particular to a high-recovery recovery process for mine water containing high sulfate and high hardness, and belongs to the field of mine water reuse. Background technique [0002] With the rapid development of my country's economy and society, the demand for metal mines and coal mines is also increasing. In the process of large-scale resource development, the geological environment and ecological system of the mining area are also affected, mainly manifested in the depletion of shallow groundwater resources and water pollution, resulting in serious water shortages in the mining area. In order to meet normal production needs, mine water can be recycled, which not only protects the safety of mining production and water supply in mining areas, but also protects the surrounding environment. Mine water includes underground gushing water, mining equipment dust washing, mining staff domestic wat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F103/10
Inventor 丁晓斌周利跃王家旺王成
Owner NANJING JIUSI HIGH TECH
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