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</script>  </div> </div> <div class="content"><p>　　斷磚是墻材企業在生產過程中產生的廢品，制品出窯卸磚時呈現出來的半截磚或碎磚塊。一般情況下有1‰～3‰的產生概率屬于常見現象，但有些企業斷磚數量高的驚人，且常年不間斷的出現，讓其蒙受了不小的損失。</p><p>　　造成制品折斷的原因以及防治辦法，在這里做個簡要的分析闡述。</p><p>　　1 制坯泥料</p><p>　　制坯泥料中的成分、性質不妥時，使其坯塊內部結構不太致密，缺乏柔韌性以及強度。比如：骨料與細料的搭配不合理；摻配韌性差的材料過多；缺乏恰當的陳化等。</p><p>　　有些以黏土或跟其性質接近的材料為原料的企業，泥料中因缺乏應有的骨料，斷磚的數量一般是較大的，比如：各類黏土、河道淤泥、鋁冶煉產生的廢料—赤泥等材料?？梢該饺胄┯操|頁巖、煤矸石、爐渣類材料以增加其骨料比例，從既實用又經濟的角度考慮摻入量在15﹪～40﹪之間。這樣不僅對減少斷磚有利，還對緩解干燥裂紋，加快干燥速度方面都有很大的好處。有些企業的內燃材料—粉煤灰摻入量偏大，這不但使坯塊的抗壓、抗折強度變差，而且在焙燒階段火溫偏高時磚塊極易軟化變形，當火度欠缺一點時制品的強度又會變得很差。有些企業制坯的泥料受到設備或人為因素影響，未能使其充分的消解、均化。讓泥料在夾生狀態下進入擠出磚機，內部的密實、柔韌度減少了許多，從而使坯體不同程度的降低了抗壓、抗折的強度。</p><p>　　2 擠出成型</p><p>　　坯塊在擠出成型時含水率過高，或擠出磚機本身的性能欠缺、故障，以及坯垛的超高碼放等，也可導致斷磚率的增加。</p><p>　　在陰雨連綿的日子，制坯泥料受到雨淋而增加了水分，有時在擠出時不再添加一點水分，坯塊的含水率也會超高的。即使在平常擠出時也要控制好兌水量。有的企業擠出磚機機型偏小或性能太差，與坯垛碼放層數不相匹配?；蛘邤D出磚機的真空、攪刀等系統出現了故障。這幾種情況都會導致斷磚的產生。</p><p>　　3 窯車</p><p>　　窯車上平面的問題也可導致斷磚率的增加。當上平面坑洼不平時，坯垛下層的坯塊支撐點就虛實不一，不實之處必然被上面坯塊重壓而折斷。另外當焙燒窯爐運行速度越快時，發熱、發燙的空窯車未來及放置降溫就被碼放上了濕坯塊，底層的坯塊底面被迅速脫水、烘干，繼而收縮后與坯塊中上部的干燥速率沒處在同步階段，斷磚就這樣產生了。有些企業采用延長窯車閑置時間，風機強制降溫或噴灑適量的水等方法，使此類問題得到了緩解。</p><p style="text-align: center;"><img src="/data/upload/image/20210115/1610676485174932.png" title="燒結磚價格.png" alt="燒結磚價格.png" width="823" height="445" border="0" vspace="0" style="width: 823px; height: 445px;"/></p><p>　　4 坯垛</p><p>　　良好的坯垛結構除了有便于烘干又利于焙燒外，還應具有減少或杜絕斷磚的性能。</p><p>　　在碼放時力爭做到上下垂直，坯塊上下層之間受力面積要大而且分布均勻，接觸點要平而穩。人工碼坯時坯垛上部的縱橫牽拉坯塊是易斷對象，在操作中可把它們碼放在上部2～3層處，以此來減少上部坯塊對其的重壓。機械碼坯時坯垛的結構只要合理，大多情況下它的斷磚數量是低于人工碼制的，究其原因是操作時的整層碼放，使各坯塊之間受力、荷載均勻，坯垛的平穩、牢固性也較好決定的。</p><p>　　5 軌道與擺渡</p><p>　　軌道在鋪設時軌與軌的連接處縫隙距離要合理些，高溫、低溫、常溫這三類情況要區別對待。制坯車間里和干燥窯前端因接近常溫軌道縫距要小些，當在夏季受熱膨脹后縫距仍在1.5cm以上時，濕坯車運行至此時的顛簸晃動，會造成一些坯塊折斷。當濕坯車向擺渡車上裝入或推下時，兩處軌道的連接處間隙過大或高低不平，或者牽引坯車時猛拉、急停等，都會造成一些坯塊的折斷。</p><p>　　6 干燥</p><p>　　由于各企業的干燥窯供熱與排潮系統繁雜不一，使用操作狀況也良莠不齊。</p><p>　　當坯塊在干燥初期受熱過早、過猛時，迅速的被迫升溫，繼而軟化后強度變差。即使沒有出現坯垛倒塌的現象，但是斷磚率也是較高的。對此要延遲送熱時間和減少送熱數量，以及降低送熱的溫度，讓坯體升溫、脫水呈梯度式遞進。</p><p>　　當出現了回潮現象時，遇上冬春季節氣溫偏低，低溫（0～18℃）坯塊在周圍濕熱氣體的侵蝕下，氣體凝結為露珠分布在局部坯塊上，露珠由坯塊的外部向內部逐漸的滲透，從而破壞了坯體原有的強度，輕則造成該處坯塊斷裂，嚴重時引起垛體的倒塌。</p><p>　　7 焙燒</p><p>　　坯塊在裝入焙燒窯爐時對含水率的高低是有一定要求的，當大于10﹪時就有可能造成坯垛在窯內的倒塌，即使沒有倒塌但在受到高溫時產生的劇烈反應，可導致預熱不良和較濕坯塊的斷裂，甚至爆炸為碎塊。通過對華東、中原、西北多家易爆裂坯塊的磚廠調研，大多有以下幾種原因造成：</p><p>　?。?）入窯坯塊含水率偏高，水分應控制在6%以內為妥，并且越低越對控制爆裂及提高焙燒速度，改善制品品質，降低能耗等方面有利。</p><p>　?。?）制坯泥料過于細膩使坯體透水、通氣性變弱，坯塊在焙燒窯內的預熱帶階段升溫后內部的某些物質便轉變為氣壓，當這種內脹壓力超過坯體的耐受程度時就會造成緩慢或瞬間釋放，導致坯體碎化為幾塊或十幾塊，如：水分轉變為水蒸氣；內燃中的氫、氮等分子揮發均可引起爆裂?？稍谀嗔现袚饺胗操|頁巖、煤矸石、爐渣等顆粒料，用以增加坯塊的透氣性，從而減少或杜絕了壓力氣體的聚集。</p><p>　?。?）當焙燒窯爐內部的構造或坯垛碼放有缺陷時也會引起坯塊的爆裂，如：窯爐與垛體之間的間隙過大，或垛體中下部密度大，縱向火道尺度不妥等使過多的高溫煙氣過早而且集中炙烤局部垛體，導致坯塊急劇升溫而爆裂。</p><p>　?。?）有些窯爐的總長度偏短或焙燒帶位置放置的靠前，或生產運行中向窯內進坯頻率太高都會加劇坯塊的爆裂。</p><p>　?。?）提閘用風的方式也要以充分利用熱能，逐步讓坯塊預熱升溫為原則。常用的閘型有梯形與橋形兩種，要依據情況區別使用。</p><p>　　無論是何種原因造成的焙燒火度偏高時，磚體軟化后被上部磚塊的重壓而變形折斷。這要在控制好內燃的超量摻配；及時準確的調節局部超高火溫；碼制合理的坯垛結構與布局；外投燃料時要審視準火度，并且注意投入的部位與方式、數量等方面下功夫。</p><p><br/></p></div> <h3 class="tag">本文網址：http://www.boltonphoenixtheatre.com/news/519.html </h3> <h3 class="tag">關鍵詞：<a href="http://www.boltonphoenixtheatre.com/tag/%E7%83%A7%E7%BB%93%E7%A0%96%E4%BB%B7%E6%A0%BC">燒結磚價格</a> </h3> <div 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