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Method for treating circulating water

A treatment method and technology for circulating water, applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. To achieve the effect of reducing corrosion, saving cost and good treatment effect

Inactive Publication Date: 2012-05-02
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

The purpose of the present invention is to overcome the deficiencies of the prior art and solve the problem of unstable water quality of steel slag hot and stuffy circulating water, especially the problem of serious scaling

Method used

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  • Method for treating circulating water
  • Method for treating circulating water
  • Method for treating circulating water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Such as figure 1 As shown, the Jiujiang steel slag hot stuffy circulating water treatment process, the specific steps are as follows:

[0034] Step 1: The backwater in the steel slag hot and stuffy backwater well enters the perforated tube aerator through the centrifugal pump; at the same time, the CO 2 Enter the perforated tube through the pressure reducing valve, control valve and flow meter; the CO 2 For industrial liquid CO 2 , the amount of feed is determined by the amount of return water, water quality and the PH value of the outlet water of the advection sedimentation tank; in this test, CO 2 Concentrations up to 0.25 m 3 Gas / m 3 water;

[0035] Step 2: Mix in CO 2 The backwater enters the flocculation stirring tank for flocculation and sedimentation; the Ca(OH) in the backwater 2 In the flocculation stirred tank, with CO 2 The reaction takes place to generate CaCO 3 Precipitation; CO 3 2- with CO 2 Reacts with water to form HCO 3 - ;

[0036] Step...

Embodiment 2

[0042] Before treatment, the pH index of the backwater from the hot stuffy backwater well was 11.89, the water temperature was 63°C, and the total hardness was 760.32 mg / L, OH - Alkalinity is 584.45 mg / L, CO 3 2- Alkalinity 115.62 mg / L, total dissolved solids 1740 mg / L, electrical conductivity 3400 μs / cm, suspended solids concentration 150 mg / L;

[0043] The method for processing backwater is the same as in Example 1, and CO 2 The concentration is 0.20 m 3 Gas / m 3 Water, settling time 1 h, effluent pH value 10.91, total hardness 144.94 mg / L, OH - Alkalinity is 41.04 mg / L, CO 3 2- The alkalinity was 112.33 mg / L, the total dissolved solids was 365 mg / L, and the conductivity was 749 μs / cm.

Embodiment 3

[0045] Before treatment, the pH value of hot stuffy return water of steel slag was 11.98, the water temperature was 67°C, and the total hardness was 837.64 mg / L, OH - Alkalinity is 675.05 mg / L, CO 3 2- The alkalinity is 183.61 mg / L, the total dissolved solids is 1853 mg / L, the conductivity is 3590 μs / cm, and the concentration of suspended solids is 254 mg / L.

[0046] The method for processing backwater is the same as that in Example 1, the CO 2 The concentration is 0.28 m 3 Gas / m 3 water, settling time 1 h, effluent pH value 10.04, total hardness 84.08 mg / L, CO 3 2- Alkalinity is 21.60 mg / L, HCO 3 - The alkalinity was 32.40 mg / L, the total dissolved solids was 220 mg / L, and the conductivity was 455 μs / cm.

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Abstract

The invention discloses a method for treating circulating water. The method comprises the following steps of: making CO2 gas flow through a perforated pipe aerator, adding into the space between a steel slag hot stifle recharging well and a flocculating and stirring pool, and reacting CO2 with return water in a steel slag hot stifle circulating system to remove precipitates; and regulating the balanced relation between the air-entrapping amount and the water amount in an automatic pH control mode till the water quality of discharged water is stable. By adopting the method, calcium ions in return water in the steel slag hot stifle circulating system can be reduced effectively, the pH is adjusted, and the problem of scaling in the steel slag hot stifle circulating system is solved.

Description

technical field [0001] The invention relates to the treatment technology for the stable water quality of molten steel slag hot and stuffy circulating water in the smelting industry, especially the CO 2 It is a treatment technology for the stable water quality of steel slag hot stuffy circulating water. Background technique [0002] The iron and steel industry is one of the industries that consume the most resources and energy, and a large amount of steel slag is bound to be produced during the smelting process. About 0.34 tons of blast furnace slag is produced for every ton of iron smelted, and about 0.12 tons of steel slag is produced for every ton of steel smelted. With the rapid development of the steel industry, the amount of steel slag has increased accordingly, and the "zero discharge" of steel slag has become an important issue for the steel industry to take the road of circular economy and achieve sustainable development. In recent years, the third-generation steel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
Inventor 邹元龙赵锐锐王海东高康乐李红程小鸥孙玉亮刘静文邱鹏
Owner CENT RES INST OF BUILDING & CONSTR CO LTD MCC GRP
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