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Process and device for treating high-hardness and high-alkalinity strong brine from iron and steel plants

A treatment process, high alkalinity technology, applied in water/sewage treatment, metallurgical wastewater treatment, water treatment parameter control, etc., can solve the problems of poor pretreatment water quality, large floor area, reverse osmosis fouling, etc., to achieve Effects of avoiding pollution, reducing facility footprint, and small concentrated water flow

Pending Publication Date: 2017-02-15
CENT RES INST OF BUILDING & CONSTR CO LTD MCC GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process has problems such as large floor area, long process, poor pretreatment water quality, serious reverse osmosis fouling, short cleaning cycle, and shortened membrane life.

Method used

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  • Process and device for treating high-hardness and high-alkalinity strong brine from iron and steel plants
  • Process and device for treating high-hardness and high-alkalinity strong brine from iron and steel plants
  • Process and device for treating high-hardness and high-alkalinity strong brine from iron and steel plants

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] See the table below for relevant water quality.

[0032] (1) Concentrated salt water with high hardness and high alkalinity first enters the dosing and removing hardness reaction device for two-stage dosing. The first stage adds 100mg / L calcium hydroxide, and the reaction is mixed for 1 minute to keep the pH in the pool above 9.8; Add 100mg / L sodium hydroxide in the second stage, mix and react for 1 minute, and keep the pH in the pool at about 11; (2) The high-hardness and high-alkalinity concentrated brine that has been mixed with the drug enters the concentrated sedimentation tank, and the residence time of the concentrated sedimentation tank is 2 minutes, control the solid content at 0.1%; (3) The mixed solution formed by the high hardness and high alkalinity concentrated brine and the sediment in the concentrated sedimentation tank enters the tubular microfiltration membrane for circulation filtration, and the water after hardness removal enters the pH adjustment (4...

Embodiment 2

[0036] See the table below for relevant water quality.

[0037] (1) Concentrated salt water with high hardness and high alkalinity first enters the dosing and removing hardness reaction device for two-stage dosing. The first stage is to add 2000mg / L sodium hydroxide, and the reaction is mixed for 60 minutes to keep the pH in the pool at about 10.8; Add 2000mg / L sodium hydroxide in the second stage, mix and react for 60 minutes, and keep the pH in the pool at about 12; (2) The high-hardness and high-alkalinity concentrated brine that has been mixed with the drug enters the concentrated sedimentation tank, and the residence time of the concentrated sedimentation tank is 120 minutes, control the solid content at 10%; (3) The mixed solution formed by the high hardness and high alkalinity concentrated brine and the sediment in the concentrated sedimentation tank enters the tubular microfiltration membrane for circulation filtration, and the water after hardness removal enters the pH...

Embodiment 3

[0041] See the table below for relevant water quality.

[0042] (1) Concentrated salt water with high hardness and high alkalinity first enters the dosing and removing hardness reaction device for two-stage dosing. The first stage is to add 810mg / L sodium hydroxide, and the reaction is mixed for 15 minutes to keep the pH in the pool at about 10.3; Add 442mg / L sodium hydroxide in the second stage, mix and react for 15 minutes, and keep the pH in the pool at about 11.3; (2) The high-hardness and high-alkalinity concentrated brine that has been mixed with the drug enters the concentrated sedimentation tank, and the residence time of the concentrated sedimentation tank is For 30 minutes, control the solid content between 4% and 5%; (3) The mixed solution formed by the high hardness and high alkalinity concentrated brine and the sediment in the concentrated sedimentation tank enters the tubular microfiltration membrane for circulation filtration, and passes through the hardness remo...

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Abstract

The invention relates to a process and a device for treating high-hardness and high-alkalinity strong brine from iron and steel plants. The process includes steps of (1), feeding the high-hardness and high-alkalinity strong brine into chemical feeding, hardness removing and reaction devices, separately adding sodium hydroxide into the chemical feeding, hardness removing and reaction devices at two steps, mixing and stirring the high-hardness and high-alkalinity strong brine and the sodium hydroxide and carrying out sufficient reaction; (2), feeding the high-hardness and high-alkalinity strong brine mixed with chemicals into a concentration and sedimentation tank; (3), feeding mixed liquid formed by the high-hardness and high-alkalinity strong brine and sediments in the concentration and sedimentation tank into tube micro-filtration membranes, carrying circulation filtration on the high-hardness and high-alkalinity strong brine and the sediments, feeding hardness-removed produced water into a pH (potential of hydrogen) regulating tank and feeding strong liquor back to the concentration and sedimentation tank; (4), adding hydrochloric acid into strong brine in the pH regulating tank to regulate the pH of the strong brine until the strong brine is neutral, then feeding the strong brine into a reverse osmosis device and concentrating the strong brine; (5), recycling produced water of the reverse osmosis device as new industrial water and delivering concentrated water to the iron and steel plants for carrying out heating stuffing treatment on splashing slag or steel slag. The process and the device have the advantage that the problem of influence on local aquatic ecological environments of enterprises due to the fact that high-hardness and high-alkalinity strong brine only can be treated and discharged at present can be solved.

Description

technical field [0001] The invention relates to a process and device for treating high-hardness and high-alkalinity concentrated brine in an iron and steel plant, that is, the concentrated water is treated by adding medicine to remove hardness-tubular microfiltration membrane-adjusting pH-reverse osmosis concentration-splashing slag or hot stuffiness to absorb concentrated water Brine processes and installations. Background technique [0002] The iron and steel industry is one of the industries that consume the most resources and energy. It needs a large amount of high-quality water resources in production, mainly circulating cooling water. Due to the large amount of water evaporation in the process of circulating cooling water, the concentration of salt and organic matter in the water is caused. Therefore, no matter what treatment, separation or concentration method is adopted, there will always be a part of the water whose salt content is much higher than that of the inco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C21B3/06C02F103/16
CPCC21B3/06C02F9/00C02F2301/046C02F2103/16C02F2209/06C02F2209/08C02F1/52C02F1/66C02F1/444C02F1/441C02F5/02C02F5/06Y02P10/20Y02W30/50
Inventor 逯博特石宇高康乐王海东李红孙玉亮张硕
Owner CENT RES INST OF BUILDING & CONSTR CO LTD MCC GRP
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