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    硅灰石

        硅灰石(wollastonite)成分Ca3〔Si3O9〕。三斜晶系。通常呈片狀、放射狀或纖維狀集合體。白色微帶灰色。玻璃光澤,解理面上珍珠光澤。硬度4.5~5.0。解理平行{100}完全,平行{001}中等,兩組解理面交角為74°。密度2.78~2.91克/立方厘米。主要產于酸性侵入巖與石灰巖的接觸變質帶,為構成矽卡巖的主要礦物成分。此外,還見于某些深變質巖中。用作:造紙、陶瓷、水泥、橡膠、塑料等的原料或填料;氣體過濾材料和隔熱材料;冶金的助熔劑等。

    基本介紹

    英文名

      wollastonite

    組成

      CaSiO3或CaOSiO2,含SiO251.75%、CaO48.25%。常含鐵、錳、鎂。

    性質

      硅灰石是一種三斜晶系,細板狀晶體,集合體呈放射狀或纖維狀。顏色呈白色,有時帶淺灰、淺紅色調。玻璃光澤,解理面呈珍珠光澤。硬度4.5~5.5,密度2.75~3.10g/cm3。完全溶于濃鹽酸。一般情況下耐酸、耐堿、耐化學腐蝕。吸濕性小于4%。吸油性低、電導率低、絕緣性較好。硅灰石是一種典型的變質礦物,主要產于酸性巖與石灰巖的接觸帶,與符山石、石榴石共生。還見于深變質的鈣質結晶片巖、火山噴出物及某些堿性巖中。硅灰石是一種無機針狀礦物,其特點無毒、耐化學腐蝕、熱穩定性及尺寸穩定良好,有玻璃和珍珠光澤,低吸水率和吸油值,力學性能及電性能優良以及具有一定補強作用。本公司的硅灰石產品,纖維長而易分離,含鐵量低,白度高。該產品主要用作高聚物基復合材料的增強填料。如塑料、橡膠、陶瓷、涂料、建材等行業。

    基本特點

      硅灰石屬于一種鏈狀偏硅酸鹽,又是一種呈纖維狀、針狀。由于其特殊的晶體形態結晶結構決定了
      

    其性質,硅灰石具有良好的絕緣性,同時具有很高的白度、良好的介電性能和較高的耐熱、耐候性能。因硅灰石廣泛地應用于陶瓷、化工、冶金、造紙、塑料、涂料 等領域。。

    基本分類

    涂料級硅灰石粉

      具有一種良好的補強性,既可以提高涂料的韌性和耐用性,又可以保持涂料表面平整與及良好的光澤度。而且提高了抗洗刷和抗風化性能,還可減少涂料與油墨的吸油量并保持堿性,具有抗腐蝕能力。可以得到高質量顏色明亮的涂料,并具有良好的均涂性和抗老化性能。使涂料可以得到更好的機械強度、增加耐久性、增強粘附力和抗腐蝕性能。還有良好的覆蓋率、附著力。

    塑料橡膠級硅灰石

      具有獨特的針狀纖維,具有良好的絕緣性、耐磨性,以及較高的折光率。是塑料、橡膠制品較好的填充材料。特點與性能:硅灰石粉可以提高沖擊強度、增強流動性以及改善抗拉強度、沖擊強度、線性拉伸及模收縮率。

    摩擦級硅灰石粉

      是一種特殊的針狀結構,同時硅灰石獨有的物理機械效能。大大增強了成品的耐摩擦性、耐熱性。當產品填充到里面,可以提高摩擦靈活性與及穩定性等特點

    造紙級硅灰石粉

      經過特殊加工工藝后仍能保持其獨特的針狀結構,使添加了硅灰灰石粉的白板紙,提高其白度,不透明度(面層遮蓋度),平整度,平滑度,適應性, 減少定量橫差和紙板濕變形,提高印刷適應性,并且可大幅度降低其他各種原材料的使 用量,從總體上降低紙制品成本。

    建材級硅灰石粉

      是一種無毒、無味、無放射性等優點逐漸取代了對人體健康有害的石棉,成為新世紀環保建材的新原料。經過特殊加工工藝后仍能保持其獨特的 針狀結構,使添加了硅灰石針狀粉的硅鈣板、防火板等材料的抗沖擊性、抗彎折強度、耐磨強度均大大提高。在建筑材料領域,硅灰石將被更加廣泛的應用!

    陶瓷級硅灰石粉

      在陶瓷原料中加入適量的硅灰石粉,可以大幅度降低燒成溫度,縮短燒成時間,實現低溫快速一次燒成。大量節約燃料,明顯降低產品成本;同時提高產品的機械性能、減少產品的裂縫和翹曲、增加釉面光澤、提高胚體強度,進而提高產品的合格率。

    硅灰石應用領域

      硅灰石可制剎車片、陶瓷釉面等,廣泛應用于汽車、冶金、陶瓷、塑料等工業生產中。其中,目前世界上硅灰石消費前景最看好的領域是工程塑料行業,硅灰石作為塑料橡膠工業的填料和補強劑,在工業制成品中越來越多地替代金屬部件,市場對其需求增長迅速。
      由于加工方法的改進,超細粒物質的獲得,潛在的新用途正陸續被發現,使硅灰石的用途日漸廣泛。據國外專家預測,未來硅灰石應用領域所占比例如下:陶瓷工業及有關部門6%;涂料、塑料和裝飾材料22%;石棉替代品5%;El常生活絕緣物品用絕緣陶瓷泡沫12%;建筑用絕緣陶瓷泡沫6%;耐火絕緣層陶瓷泡沫2%;鑄造生產用陶瓷泡沫4%;礦渣混凝土砌塊面層涂料3%;造紙生產40%。

    產量分布

      世界硅灰石資源較豐富,資源總量估計在8億t以上,但分布很不均衡。目前僅有20多個國家發現硅灰石礦床,主要分布于亞洲的中國、印度、哈薩克斯坦、烏茲別克斯坦、塔吉克斯坦和美洲的墨西哥、美國等國,探明儲量3億t;此外,芬蘭、土耳其、納米比亞、南非、蘇丹、加拿大和南斯拉夫等國也發現了硅灰石礦床。
      中國和印度是世界上硅灰石資源最豐富的國家。雖然中國硅灰石地質找礦工作起步較晚,但自1975年開始,20年來已取得很大進展,在17個省、自治區發現礦產地百余處,估計資源量近2億t。截至1996年底止,在14個省、自治區中已有探明儲量的礦產地31處,保有礦石儲量13265萬t,位居世界前列。保有儲量最多的是吉林省,占全國總保有礦石儲量的40%;其余依次為云南、江西、青海、遼寧4省,共占全國保有礦石儲量的49%;浙江、湖南、安徽、內蒙古、廣東5省區共占全國保有儲量的10%;江蘇、廣西、湖北、黑龍江4省區共占全國保有礦石儲量的1%。
      在全國保有儲量的31個礦產地中,保有礦石儲量據其品位換算成礦物儲量后,按全國礦產儲量委員會《硅灰石地質勘探規范》(試行)中硅灰石礦床規模劃分標準,屬于特大型礦的6處,大型礦12處,中型礦5處,小型礦8處。其中:已開采利用的礦產地18處,包括特大型礦4處、大型礦8處、中型礦2處、小型礦4處,共計占用保有礦石儲量7661萬t,占全國保有礦石儲量的58%;可供近期利用的礦產地10處,包括特大型礦2處、大型礦3處、中型礦1處、小型礦4處,共計保有礦石儲量4816萬t,占全國保有礦石儲量的36%;由于與其他礦產共生而難以采選及開采條件差等原因,近期難以利用的礦產地有3處,包括大型礦1處、中型礦2處,共計保有礦石儲量788萬t,占全國保有礦石儲量的6%。

    作用用途

      涂料級硅灰石粉具有一種良好的補強性,既可以提高涂料的韌性和耐用性,又可以保持涂料表面平整與及良好的光澤度。而且提高了抗洗刷和抗風化性能,還可減少涂料與油墨的吸油量并保持堿性,具有抗腐蝕能力。可以得到高質量顏色明亮的涂料,并具有良好的均涂性和抗老化性能。使涂料可以得到更好的機械強度、增加耐久性、增強粘附力和抗腐蝕性能。還有良好的覆蓋率、附著力。
      塑料橡膠級硅灰石具有獨特的針狀纖維,具有良好的絕緣性、耐磨性,以及較高的折光率。是塑料、橡膠制品較好的填充材料。特點與性能:硅灰石粉可以提高沖擊強度、增強流動性以及改善抗拉強度、沖擊強度、線性拉伸及模收縮率。
      摩擦級硅灰石粉是一種特殊的針狀結構,同時硅灰石獨有的物理機械效能。大大增強了成品的耐摩擦性、耐熱性。當產品填充到里面,可以提高摩擦靈活性與及穩定性等特點造紙級硅灰石粉經過特殊加工工藝后仍能保持其獨特的針狀結構,使添加了硅灰灰石粉的白板紙,提高其白度,不透明度(面層遮蓋度),平整度,平滑度,適應性, 減少定量橫差和紙板濕變形,提高印刷適應性,并且可大幅度降低其他各種原材料的使 用量,從總體上降低紙制品成本。
      建材級硅灰石粉是一種無毒、無味、無放射性等優點逐漸取代了對人體健康有害的石棉,成為新世紀環保建材的新原料。經過特殊加工工藝后仍能保持其獨特的 針狀結構,使添加了硅灰石針狀粉的硅鈣板、防火板等材料的抗沖擊性、抗彎折強度、耐磨強度均大大提高。在建筑材料領域,硅灰石將被更加廣泛的應用!
      陶瓷級硅灰石粉在陶瓷原料中加入適量的硅灰石粉,可以大幅度降低燒成溫度,縮短燒成時間,實現低溫快速一次燒成。大量節約燃料,明顯降低產品成本;同時提高產品的機械性能、減少產品的裂縫和翹曲、增加釉面光澤、提高胚體強度,進而提高產品的合格率。

    我國硅灰石發展前景

      目前,我國的硅灰石產量和出lZl量均居世界第一位。我國硅灰石行業年產量55萬t,產品出口到日本、韓國及東南亞等亞洲國家和德國、西班牙等歐洲國家,出15量達20萬t,占國際市場的70%。我國硅灰石產品出口的主要市場在歐洲,出口量約l5萬t/a。出15日本及韓國的產品主要是超細針狀粉。雖然目前硅灰石行業實現了整體盈利,但利潤仍很低,特別是人民幣升值及出15退稅率由8%降為0,壓縮了企業的利潤空間,加之采礦準人項目增多,費用增大,采礦與加工成本提高,這些給企業盈利帶來了不小的壓力。因此,專家預測,2007年硅灰石產品的價格將有小幅提升,出15日本和韓國的產品價格漲幅約為5%~8%。
      2010年硅灰石需求量為50萬t,2020年需求量為60萬t。由于國內外硅灰石市場需求增長勢頭不減,價格逐步提高,一些國際大公司高度關注我國的市場和資源優勢,試圖以合資、并購等方式搶占我國的優質硅灰石資源,進而壟斷市場。國內企業及資源所屬地區的政策部門,要審慎對待外資的介入,合理、妥善地利用資源,確保行業和企業的健康發展。
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