Industrial steel plant wastewater treatment What are the ways? How many do you know?

The rapid development of modern industry, with the problems one by one from the prominent. Industrial steel plant wastewater treatment What are the methods? For our country's steel industry production process analysis, the choice of steel materials, including sintering, iron making, steel rolling and other production processes and so on the production process. With the resulting steel waste water comes from the production process water and some set water, cooling water, washing water and so on. Indirect cooling water is only polluted by heat in the course of use, and can be reused after being cooled down. Direct cooling water contains contaminants due to direct contact with product materials and the like, and can be recycled or cascaded after being treated.

Mine waste water treatment:

Mine wastewater is characterized by water, water quality changes, the wastewater was acidic. It is necessary to determine the treatment scale of the mine waste water reasonably and to make the water quality of the treated water not unduly fluctuate. It is often necessary to set up the regulating reservoir and regulate the reservoir. The water is collected and treated again. Mine wastewater is sulfuric acid-based wastewater, the general pH value of 1.5 to 6, so low sulfuric acid content, apparently no value of the recovery, it is often used in the treatment method. Acid mine waste water treatment, the general method of lime and.

In view of the fact that Fe (OH) 3 is far superior to Fe (OH) 2 in terms of precipitation and dewatering performance, the ability to treat structures and equipment is reduced by aeration or with nitric oxide Catalytic oxidation, and then lime and can improve the precipitation effect and effluent quality.

Mine acid wastewater treatment is inseparable from the neutralization method, the commonly used neutralizer is limestone and lime, because other neutralizers high price should not be used, so the treated water is often high content of Ca2 or saturated, and then re-use Special attention should be paid to the problem of water quality stability, or cause obstruction of pipes and equipment, resulting in greater loss of production.

Sinter plant wastewater treatment and reuse  

Sintering process is to slag, fuel and solvent according to a certain proportion of ingredients, mix, and then ignite at high temperature combustion, which uses the fuel generated when burning high temperature, so that the local mixture of melting, the bulk material particles bonded into Bulk sinter, as a raw material for ironmaking, removes harmful impurities such as sulfur, arsenic, zinc, lead, etc. during the combustion process. Sinter after cooling, crushing, sieving and 5 ~ 50mm granular material into the blast furnace smelting.

The source of wastewater and water quality, water  

Sinter plant wastewater mainly from wet dust drainage, dilute to the floor water and equipment cooling drainage. Wet drainage in addition to a large number of suspended solids, to be treated before use cascade or recycling, if the discharge must be processed to meet the emission standards; flushing floor water intermittent drainage, high suspended solids content, and containing large particles of material , After purification can be recycled; equipment cooling water, water quality has not been contaminated by dirt, only the water temperature (called thermal pollution), after cooling treatment, the general can be recycled and reused.

Therefore, the waste water pollution in the sintering plant mainly refers to the waste water containing high suspended solids. If untreated, the waste water will be greatly endangered, wasting water resources and a large amount of recyclable useful substances. Sintering plant wastewater concentrated by sedimentation sludge iron content is higher, better recovery value.

Wastewater treatment methods:  

Sinter plant wastewater treatment is the main goal is to remove suspended solids, in other words is the dust, washing waste water treatment. The main technical difficulty of such wastewater treatment is sludge dewatering. Sintering plant waste water after sedimentation sludge iron grade is high, precipitation faster, but due to a certain viscosity, it makes dehydration difficult.

China sintering plant advanced level of process equipment, a great gap between the wastewater treatment process also co-exist. Domestic wastewater treatment process commonly used in the following five: Stratosphere sedimentation tank decentralization process, concentrate concentrated mud bucket treatment process, concentrate concentrated zipper processing technology, concentrated vacuum filter (or filter press) treatment process, focus Concentrated comprehensive treatment process.

Advection sedimentation tank dispersion process :

This is a simple, "ancient" treatment process, mostly for the extension of legacy facilities, which is currently used in some workshops for small and medium-sized or large-scale sinter plants, as well as mechanical equipment such as Chain scraper or mechanical grab crane. Concentrated thick mud bucket treatment process

This process is currently common in small and medium sintering plant process. Sinter plant waste water first into the thickener, the sediment after the bottom sediment by the sand pump sent to the thick bucket for processing, thick bucket bucket is built in the mouth of the return belt structure. Sludge in the thick bucket usually to stand 3 ~ 6d is appropriate, the time is too long, will make the sludge compaction, resulting muddy difficulties; time is too short, will make the sludge aqua aluminum too high.

Mud is done by a screw propeller. Concentrated concentrated mud hopper treatment process is an effective way to deal with the sintering plant wastewater, the current use of small and medium factories in our country, not only to improve drainage water quality, but also recycled useful substances; but not suitable for large-scale sintering plant should be selected Other craft. Concentrated concentrated zipper processing technology This method is characterized by the water quality up to recycled water quality requirements, through the sludge zipper to ensure the continuity of sludge.

Thickened overflow water for recycling. The concentrated bottom sludge is discharged into a zipper machine, re-precipitated in a zipper machine, and the precipitated sludge is transferred to a return belt by a zipper and sent to a mixing batch. Its moisture content can reach 20% ~ 30%, zipper overflow water and then returned to the concentration pool.

Concentrated vacuum filtration (or pressure filtration) process The first part of the concentration of concentrated treatment and basically the same as the previous, and then part of the sludge treatment is the use of vacuum filter (or filter press).

In recent years through industrial testing, belt filter press in the sintering plant sludge dewatering has a good effect, provides a new design choice. Centralized Concentration Comprehensive Treatment Centralized Concentration Comprehensive Treatment is a more advanced process for the treatment of wastewater from a sintering plant. It is characterized by different water quality, respectively, the use of measures to achieve the most effective reuse, reduce efflux of waste water.

Sintering plant wastewater treatment technology and development trend With the development of iron and steel industry, sinter plant technology tend to large-scale belt sintering machine. For large-scale plant dust removal equipment and more use of electrostatic precipitator, thus replacing the wet dust, sintering plant's main wastewater will be fundamentally resolved.

From the actual situation in our country, wet dust removal equipment should be used in a relatively long period and a large area. Therefore, it is still necessary to study new methods and new processes for wastewater treatment. According to the analysis of the situation at home and abroad, the development trend of the sintering plant wastewater treatment technology can be summarized as the following aspects.

Enhanced treatment, the implementation of repeated use of water Wastewater produced by the sintering plant, generally do not contain toxic and harmful pollutants, through cooling, precipitation, can be recycled or cascade use. On the sintering plant wastewater treatment, both to save water, but also the recovery of useful substances, its economic efficiency is very objective. As long as the choice of a good process, so that the production of waste water can reach or close to the goal of zero emissions.

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