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      2. 相關脫水技術
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        選礦廠尾礦處理-21

        時間: 2018-01-21 00:00:00瀏覽次數:19536

        一、選礦廠尾礦處理的意義:

        原礦進入選礦廠經過破碎、磨礦和選別作業之后,礦石中的有用礦物分選為一種或多種精礦產品。尾礦則以礦漿狀態排出。精礦產率較小,有色金屬選礦廠精礦產率一般只有10%~20%;尾礦數量很大,產率一般為80%~90%;甚至還要大些。如果一座日處理為100噸的小型選礦廠,每天排放的尾礦量可達80~90噸 以上;原礦品位高,精礦產率大,則尾礦量少。大量的尾礦若不妥善處理,危害甚大。選礦廠排出的尾礦水中常含有大量的藥劑及有害物質。其來源為選礦過程中加 入的浮選藥劑以及礦石中的金屬元素,常見的有氰化物、黃藥、黑藥、松油、銅離子、鉛離子、鋅離子,個別情況下還可能有砷、酚汞等。尾礦水中這些有害物質達 不到排放標準時,對人體、牲畜、魚類及農田均有害。因此選礦廠尾礦不能任意排放。從而帶來一系列的嚴重問題,并影響企業的發展。

        另 一方面,尾礦的概念是相對的,尾礦中含有大量的有用成分。在目前的技術水平下,有些貴重金屬、稀有金屬不能回收,但隨著科學技術的進步,尾礦中的有用成分 可以重新開發利用。尾礦資源得到綜合利用國內外已有許多實例,如湖北省銅錄山礦選礦廠尾礦中含有豐富的金、銀、銅、鐵等有用成分,近年來隨著選礦技術的發 展,1985年該礦采用弱磁-強磁選技術對尾礦再造,每年從尾礦中回收了數萬噸鐵精礦,價值數萬元,現正在進一步將尾礦再磨再選,使尾礦中的金、銀、銅、鐵等有用礦物得到充分回收利用,從而礦山經濟效益大為提高。

        可見,尾礦不能隨意丟棄,尾礦處理不僅涉及到環境保護、資源合理利用的問題,還與法律方面的問題有關。因此,對選礦廠尾礦進行妥善處理有著十分重要的義。

        二、尾礦綜合利用途徑:

        根據選礦方法的不同,更主要的是尾礦性質的差異。對尾礦處理也就有著不同的方法。國內外目前對尾礦資源的綜合利用可以概括為下列幾種途徑:

        1、首先要盡量做好尾礦資源的有用組分的綜合回收利用,采用先進技術和合理工藝對尾礦進行再選,較大限度地回收尾礦中的有用組分,這樣可以進一步減少尾礦數量。有的選礦廠向無尾礦方向發展。

        2、 尾礦用作礦山地下開采采空區的充填料,即水砂充填料或膠結充填的集料。尾礦作為采空區的充填料使用,較理想的充填工藝是全尾礦充填工藝,但目前仍處于試驗 研究階段。在生產上采用的都是利用尾礦中的粗粒部分作為采空區的充填料。選礦廠的尾礦排出后送尾礦制備工段進行分級,把粗砂部分送井下采空區,而細粒部分 進入尾礦庫堆存。這種尾礦處理方法在國內外均已得到應用。

        3、用尾礦作為建筑材料的原料:制作水泥、硅酸鹽尾砂磚、瓦、加氣混凝土、鑄石、耐火材料、玻璃、陶粒、混凝土集料、微晶玻璃、溶渣花磚、泡沫玻璃和泡沫材料等。

        4、用尾砂修筑公路、路面材料、防滑材料、海岸造田等。

        5、在尾礦堆積場上覆土造田,種植農作物或植樹造林。

        6、把尾礦堆存在專門修筑的尾礦庫內,這是多數選礦廠目前較廣泛采用的尾礦處理方法。

        三、尾礦處理技術:

        尾礦處理是礦山生產的重要環節,也是選礦廠建設和運營的重要組成部分。近年來,迫于環境和安全的壓力,改革傳統的尾礦地表堆存處理方法存在的環境、安全和占用土地等諸多問題,不斷開發安全、高效的尾礦處理新技術,逐步得到了工業化應用

        尾礦濃縮脫水是尾礦處理的重要環節,通常采用的尾礦脫水方法為重力?沉降法(或加絮凝劑的重力沉降法), 由于重力沉降法的顆粒沉降速度低、傳統重力沉降設備結構方面的原因,造成重力沉降法的濃縮效率低、產物濃度低。針對傳?統的重力沉降法存在的問題,近年來 國內外在提高尾礦濃縮效率和提高尾礦濃度方面進行了廣泛的探索,從提高脫水速度、降低作業費用角度,開發了一些尾礦濃縮的新工藝和新裝備。

        綠豐牌帶式壓濾機、帶式濃縮壓濾脫水機、帶式污泥脫水機等尾礦脫水專用設備在尾礦處理方面,脫水效果好、適應性強、壓濾脫水后尾礦的處理方式靈活,近年來在礦山尾礦處理中得到了廣泛應用,在冶金礦山尾礦處理中也有應用報道。

        綠豐公司堅持走技術創新之路,不斷以市場為導向,以選進的產品為依托。自主研制了系列高品質、高質量的污泥脫水先進設備,為滿足礦山用戶在尾礦脫水方面需求,在原來的尾礦脫水工藝上,引進了新技術,開發了新產品----分體式帶式濃縮壓濾機和分體式雙層濃縮壓濾機,采用分體式結構,可根據污泥的含水率和用戶的需求,濃縮機的長度可在較大范圍內變動,以達到更好的脫水效果,處理量比普通機型提高了50%以上,濾餅含水率低10%,運行、成本低30%,,雙層濃縮壓濾機比單層濃縮壓濾機多一層濃縮脫水段,處理量特別大,比單層濃縮脫水機增加30%-40%,特別適用于大型礦山尾泥脫水使用。

        上一條: 沒有了
        綠豐環保專注于脫水技術解決方案

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