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1、連鑄和熱軋含油濁環(huán)水處理研究[摘要]連鑄、熱軋濁環(huán)水回水中含有高濃度懸浮物、油污等,容易引起噴淋系統(tǒng)噴嘴堵塞、過(guò)濾器濾料板結(jié)和偏流,使冷卻水供水不足或供水不均,造成鑄坯、軋件出現(xiàn)缺陷,以至次品。國(guó)內(nèi)許多生產(chǎn)廠家的濁環(huán)水處理工藝中,存在著各種各樣不足,供水水質(zhì)差、運(yùn)行條件惡化。在已有處理設(shè)施不變的情況下,通過(guò)配合使用化學(xué)助劑,使?jié)岘h(huán)水供水水質(zhì)得到很好的改善,解決了系統(tǒng)存在噴嘴堵塞和過(guò)濾器濾料板結(jié)的隱患,滿(mǎn)足了生產(chǎn)高質(zhì)量鑄件和精軋產(chǎn)品的需要。[關(guān)鍵詞]連鑄;熱軋;連軋;濁環(huán)水;水處理;結(jié)垢;腐蝕;微生物繁殖;含油
2、廢水ResearchonTheTreatmentofContinuousCastingandHot-rolledTurbidRecirculatingWaterWuXinguo1,DunShichao1,YiLongxin1,WangShifu(TianjinResearch&DesignInstituteofChemicalIndustry,Tianjin300131China;2.TianjinSteelTubeCo,Ltd,Tianjin300301,China)Abstract:Highconcent
3、rationofsuspendedsubstanceandgreasydirtetc.inthecontinuouscastingandhot-rolledturbidrecirculatingwatercanleadtotheblockingofmuzzleinthegushandshowersystem.Itmaycausethehardeningofthematerialinthefilterandproduceinclinedflow,whichmayresultintheinsufficientor
4、improperdivisionofcoolingwatersupply,thusproducingdefectsiningotblankandrolledpiece,orevensubstandardproducts.Therearevariousdefectstoturbidrecirculatingwatertreatmenttechniqueofmanydomesticfactories,suchasthewatersupplyisnotsatisfactoryandtheoperationcondi
5、tionsdeteriorate.Withoutchangingthepresenttreatmentfacilitiesandwiththehelpofchemicalassistant,thehiddentroubleofblockingmuzzlesandhardeningthematerialinthefilterinthesystemcanbesolvedandthewatersupplyqualityofturbidrecirculatingwatercanbesignificantlyimpro
6、ved,thereforetoalargeextentmeetingtheneedofproducinghigh-qualitycastingsandfinishrollingproducts.KeyWords:ContinuousCasting;Hot-rolled;Continuous-rolled;TurbidRecirculatingWater;WaterTreatment;Scale;Corrosion;MicroorganismPropagation;OilinessWasteWater6連鑄濁環(huán)
7、水來(lái)自二冷噴淋系統(tǒng),用于對(duì)鑄坯、切割輥道和出坯跨等的直接冷卻;熱軋濁環(huán)水主要用于粗、精軋機(jī)、軋輥冷卻、加熱爐水封及主軋線所有設(shè)備的直接冷卻。兩種濁環(huán)水有很多共性,在生產(chǎn)運(yùn)行過(guò)程中,均與被冷卻對(duì)象(連鑄濁環(huán)水與鑄坯、連鑄機(jī);熱軋濁環(huán)水與軋件、軋機(jī)、輥道等)直接接觸,被大量的氧化鐵皮、金屬粉塵、油污等雜質(zhì)污染。連鑄和熱軋濁環(huán)回水中高濃度的油污、懸浮物等的存在,使水系統(tǒng)產(chǎn)生腐蝕、結(jié)垢和微生物繁殖等故障,最終導(dǎo)致噴淋系統(tǒng)噴嘴堵塞和過(guò)濾器濾料板結(jié)、偏流,導(dǎo)致冷卻水供水不足或供水不均。隨著連鑄、熱軋工藝的進(jìn)步和對(duì)產(chǎn)品質(zhì)量
8、要求的提高,對(duì)濁環(huán)水質(zhì)的要求也逐漸提高。良好的水處理措施是高品質(zhì)連鑄、熱軋工藝實(shí)施的保證、也是生產(chǎn)高質(zhì)量鑄坯和精軋產(chǎn)品的必要條件。1.連鑄、熱軋濁環(huán)水水質(zhì)特點(diǎn)及其危害6聯(lián)鑄、熱軋濁環(huán)水在循環(huán)過(guò)程中與鑄坯、軋件及軋機(jī)、輥道等直接接觸,水中含有很高濃度的氧化鐵皮、懸浮物、油污等[1-3]。它們的存在,為濁環(huán)水系統(tǒng)的正常運(yùn)行帶來(lái)了諸多危害[4,5]。1.1金屬腐蝕濁環(huán)水系統(tǒng)為敞開(kāi)式循環(huán),幾近飽和的溶解氧容