Unlock instant, AI-driven research and patent intelligence for your innovation.

Process and device for recycling oily and emulsion wastewater from cold rolling

A technology of emulsion and wastewater, which is applied in the direction of descaling and water softening, water/sewage treatment, chemical instruments and methods, etc. It can solve the problems of high treatment cost, large floor area, and poor effluent quality, so as to reduce the treatment cost , Improve calorific value, optimize water resources

Active Publication Date: 2021-06-01
武汉钢铁有限公司
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, conventional treatment technologies include physical methods, chemical methods, physicochemical methods and biological methods, that is, the current gravity separation, air flotation, chemical flocculation, adsorption, biological treatment, membrane separation, electrolytic oxidation, membrane bioreactor and these conventional methods However, these conventional treatment methods have problems such as high treatment cost, high energy consumption, poor adaptability, large floor area, secondary pollution, poor effluent quality and high treatment cost.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Process and device for recycling oily and emulsion wastewater from cold rolling
  • Process and device for recycling oily and emulsion wastewater from cold rolling
  • Process and device for recycling oily and emulsion wastewater from cold rolling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A process for recycling oily and emulsion wastewater from cold rolling, comprising the following steps:

[0032] 1) Pretreatment of oily and emulsion wastewater from cold rolling: pump oily and emulsion wastewater from cold rolling into the regulating tank, which is equipped with steam heating pipes, and the heat source comes from the low-pressure waste heat steam (≤2Mpa) of the steel mill. Heat to about 50-60°C. Use the waste acid (hydrochloric acid, sulfuric acid, nitric acid) demulsifier of the rolling mill to throw into the regulating tank, adjust the pH value to about 4, and the hydraulic retention time is 2h, and collect and recycle the slick oil in the regulating tank through the oil slick collection device, and carry out resources are utilized.

[0033] 2) Flocculation and sedimentation treatment: the oily / emulsion wastewater after oil recovery pretreatment is sent to the flocculation and sedimentation tank for further treatment. First add NaOH and Na 2 CO 3...

Embodiment 2

[0040] A process for recycling oily and emulsion wastewater from cold rolling, comprising the following steps:

[0041] 1) Pretreatment of oily and emulsion wastewater from cold rolling: pump oily and emulsion wastewater from cold rolling into the regulating tank, which is equipped with steam heating pipes, and the heat source comes from the low-pressure waste heat steam (≤2Mpa) of the steel mill. Heat to about 50-60°C. Use the waste acid (hydrochloric acid, sulfuric acid, nitric acid) demulsifier of the rolling mill to throw into the adjustment tank, adjust the pH value to about 4, and the hydraulic retention time is 3h, and collect and recycle the slick oil in the adjustment tank through the oil slick collection device. resources are utilized.

[0042] 2) Flocculation and sedimentation treatment: the oily / emulsion wastewater after oil recovery pretreatment is sent to the flocculation and sedimentation tank for further treatment. First add NaOH and Na 2 CO 3 The medicamen...

Embodiment 3

[0049] A process for recycling oily and emulsion wastewater from cold rolling, comprising the following steps:

[0050] 1) Pretreatment of oily and emulsion wastewater from cold rolling: pump oily and emulsion wastewater from cold rolling into the regulating tank, which is equipped with steam heating pipes, and the heat source comes from the low-pressure waste heat steam (≤2Mpa) of the steel mill. Heat to about 50-60°C. Use the waste acid (hydrochloric acid, sulfuric acid, nitric acid) demulsifier of the rolling mill to throw into the regulating tank, adjust the pH value to about 4, and the hydraulic retention time is 4h, and collect and recycle the slick oil in the regulating tank through the oil slick collection device. resources are utilized.

[0051] 2) Flocculation and sedimentation treatment: the oily / emulsion wastewater after oil recovery pretreatment is sent to the flocculation and sedimentation tank for further treatment. First add NaOH and Na 2 CO 3 The medicamen...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
hardnessaaaaaaaaaa
Login to View More

Abstract

The invention discloses a cold-rolled oily and emulsion waste water reuse process and its device. The process includes the following steps: 1) pretreatment; 2) flocculation and sedimentation treatment; 3) reuse: the cold-rolled oily and emulsion waste water after flocculation Emulsion waste water and dedusting circulating water are mixed at a mass ratio of 1:10-20 and corrosion inhibitor is added as converter gas washing water to wash the gas. The dedusting circulating water is recycled; the dosage of the corrosion inhibitor is 5-10g / m 3 . The process and device of the present invention not only greatly reduce the cost of wastewater treatment, but also realize the zero discharge of cold rolling oily wastewater and emulsion wastewater; cold rolling oily wastewater and emulsion wastewater are pyrolyzed and decomposed into The small molecule gas compound not only improves the calorific value of converter gas, but also realizes the resourceful and harmless reuse of iron and steel organic oily wastewater.

Description

technical field [0001] The invention relates to waste water treatment technology, in particular to a process and device for recycling oily and emulsion waste water from cold rolling. Background technique [0002] On the one hand, cold rolling oily and emulsion wastewater is one of the most difficult to treat high-concentration and refractory wastewater. It has the characteristics of large discharge, large water quality changes, good chemical stability, and difficult treatment. It is a kind of wastewater that is difficult to treat in the wastewater system. At present, conventional treatment technologies include physical methods, chemical methods, physicochemical methods and biological methods, that is, the current gravity separation, air flotation, chemical flocculation, adsorption, biological treatment, membrane separation, electrolytic oxidation, membrane bioreactor and these conventional methods However, these conventional treatment methods have problems such as high trea...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C10K1/02
CPCC02F1/02C02F1/5245C02F1/56C02F1/66C02F5/105C02F9/00C10K1/02Y02P20/129
Inventor 张垒王丽娜魏琨吴高明刘璞刘尚超付本全
Owner 武汉钢铁有限公司