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CN1189414C - 高硫硅酸盐水泥及其生产方法 - Google Patents

高硫硅酸盐水泥及其生产方法 Download PDF

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CN1189414C
CN1189414C CNB021388857A CN02138885A CN1189414C CN 1189414 C CN1189414 C CN 1189414C CN B021388857 A CNB021388857 A CN B021388857A CN 02138885 A CN02138885 A CN 02138885A CN 1189414 C CN1189414 C CN 1189414C
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sulfur
clinker
controlled
portland cement
cement
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CN1396135A (zh
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范基骏
王永域
韦文谦
周龙昌
廖伟雄
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Guangxi University
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00Hydraulic cements
    • C04B7/02Portland cement
    • C04B7/04Portland cement using raw materials containing gypsum, i.e. processes of the Mueller-Kuehne type
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00Hydraulic cements
    • C04B7/36Manufacture of hydraulic cements in general
    • C04B7/361Condition or time responsive control in hydraulic cement manufacturing processes
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00Hydraulic cements
    • C04B7/36Manufacture of hydraulic cements in general
    • C04B7/364Avoiding environmental pollution during cement-manufacturing
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00Hydraulic cements
    • C04B7/36Manufacture of hydraulic cements in general
    • C04B7/43Heat treatment, e.g. precalcining, burning, melting; Cooling
    • C04B7/44Burning; Melting

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Organic Chemistry (AREA)
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  • Health & Medical Sciences (AREA)
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  • Thermal Sciences (AREA)
  • Silicates, Zeolites, And Molecular Sieves (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

一种高硫硅酸盐水泥,其熟料的氧化物中SO3为1.5~3.0%,CaO为63~68%,矿物成分中CaSO4为2.6~5.1%。生产过程中四大率值分别控制在以下范围:KH:0.92~1.00;n:1.90~2.50;p:1.00~1.80;SR:0.18~0.32;其中:
Figure 02138885.7_AB_0
MgO控制在0.5~2.0%,煅烧温度控制在1350~1400℃。这种高硫硅酸盐水泥生产过程中不用加石膏,排出有毒废气少。产品强度高,性能优良,且生产成本下降,实施容易,利于环境保护。

Description

高硫硅酸盐水泥及其生产方法
                             技术领域
本发明属水泥技术领域。
                             背景技术
硅酸盐水泥在建筑工程中已得到广泛应用,我国也有了自己的国家标准。在标准中对熟料的三氧化硫含量无具体规定,一般为1%左右,最大为1.2~1.3%。标准还规定了在粉磨熟料时必须加入石膏,以保证其缓凝作用。也早已有人发现:提高水泥熟料中三氧化硫含量有利于缓凝,且一些工厂采取了用高硫煤烧制熟料的方法,以求达到加大熟料中三氧化硫含量的目的,但采用这种方法时,煤中硫相当部分成为氟硫复合矿化剂的一个组分,最后在熟料中形成硫铝酸盐和氟硫酸盐,而形成硫酸钙的量较少,导致水泥熟料凝结时间不正常。同时,生料中的煤首先要满足烧制熟料所需的热耗,形成硫酸钙却是次要的,致使熟料中生成硫酸钙量不稳定,达不到予期要求,煅烧时还排放较多二氧化硫,污染环境。本发明人曾在“水泥”杂志1999年第二期上发表过<生料中添加柠檬酸渣烧制高硫水泥熟料的试验研究>一文,介绍使用柠檬酸渣烧制高硫水泥熟料,其中提到该试验所用柠檬酸渣的成分为:%:SiO2 0.41,Al2O3 0.27,Fe2O3 0.12,CaO 31.99,MgO 0.24,SO 46.00。试验结果表明:生料中添加柠檬酸渣可使CaCO3分解提前,降低熟料液相出现温度,改善熟料性能,降低生产成本,但未公开关键工艺参数。
                                   发明内容
本发明要解决的技术问题是提高硅酸盐水泥熟料中三氧化硫含量,制备水泥时不再添加石膏。
本发明以如下技术方案解决上述技术问题:高硫硅酸盐水泥熟料的氧化物中有三氧化硫1.5~3.0%,CaO 63~68%,矿物成分中CaSO4为2.6~5.1%。
生产高硫硅酸盐水泥的方法是:在整个工艺过程中,将四大率值控制在以下范围:
         石灰饱和系数KH: 0.92~1.0
         硅率SM(n):      1.90~2.50
         铝率IM(p):      1.0~1.8
         硫率 SR         0.18~0.32   S &OverBar; R = SO 3 A l 2 O 3 + Fe 2 O 3
         Mgo控制为0.5~2.0%,煅烧温度1350~1400℃
本发明的高硫硅酸盐水泥,熟料中含有较高的硫酸盐,凝结时间正常,把它粉磨制备水泥时不用加石膏,生产出的水泥产品标号可达425~725,并利用了柠檬酸生产过程中的废渣,利于环保,降低了水泥成本。
                                具体实施方式
本发明的高硫硅酸盐水泥,其熟料中主要氧化物含量范围是:CaO 63~68%;SiO220~24%;Al2O3 3~6%;Fe2O3 2.6~5.0%;SO3 1.5~3.0%;相应的主要矿物成分为硅酸三钙(3CaO·SiO2)、硅酸二钙(2CaO·SiO2)、铝酸三钙(3CaO·Al2O3)铁铝酸四钙(4CaO·Al2O3·Fe2O3)和硫酸钙(CaSO4)。其物理性能和用途与一般硅酸盐水泥相同。
本发明的高硫硅酸盐水泥生产方法是:
将按比例配好的生料粉磨混合:
        石灰石       78~80%  (质量百分比,以下同)
        粘土         8~14%
        铁矿石       4~7%
        柠檬酸渣     4~6%
粉磨细度控制在7~10%(筛余),再在水泥窑炉中煅烧成水泥熟料,如果用立窑煅烧混合生料,还要把煤按照熟料能耗配入生料中成球,再输送到立窑中燃烧;如果用回转窑煅烧,可以直接把混合生料输送到窑内,用重油或煤煅烧。
煅烧温度控制在1350~1400℃范围,在生产过程中,最佳石灰饱和系数KH值控制在0.92~1.00,硅率SM(n)控制在1.9~2.50,铝率IM(p)控制在1.00~1.80,硫率SR控制在0.18~0.32,MgO控制在0.5~2.0%,
硫率 SR定义为 SO 3 Al 2 O 3 + Fe 2 O 3
碱总量K控制在0.25~1.00%
                         
烧成熟料放入磨机磨成水泥成品,粉磨中可加入混合材以制成不同品种水泥。柠檬酸渣中有数种类型石膏,矿化作用后,同时形成的熟料硫酸钙又具有缓凝作用。由于利用了柠檬酸渣的“双剂作用”,提高了生料的易烧性,降低了碳酸钙的分解温度和液相粘度,增加液相量,煅烧温度可降至1400℃以下,并促进了硅酸盐矿物尤其是A矿的形成,提高了水泥熟料的强度。矿化作用后形成的熟料硫酸钙,具有缓凝作用,使熟料凝结时间正常,磨制水泥时不须加入石膏,煅烧过程中排放的二氧化硫量较少,甚至可达零排放。
以下为三个具体实施例:
各实施例均在实验室内进行。向混合生料加水10%(质量%)成型为¢30×5mm小圆饼,放入马弗炉内煅烧。原料取自工厂。使用的试验和检测方法及使用的仪器按国标要求进行。各试样的煅烧温度分别在1350℃、1380℃、1400℃。
                                      表1三个混合生料试样化学成分和率值
  编号                                      化学成分/%                 率值
  Loss   SiO2   Al2O3   Fe2O3   CaO   MgO   SO3    ∑   KH     n     p
  1   34.10   13.85   3.35   2.28   43.23   0.56   1.90   99.27   0.952   2.46    1.47
  2   34.84   13.69   3.01   2.15   43.43   0.48   2.28   99.88   0.984   2.65    1.40
  3   35.12   12.63   2.98   2.16   43.21   0.91   2.26   99.27   1.06   2.46    1.38
注:Loss-烧失量
                         表2相应熟料化学成分和率值
  编号                                            化学成分/%                  率值     Vso3/%
  Loss   SiO2   Al2O3   Fe2O3   CaO   MgO   SO3   f-c     ∑     KH    n     p    SR
  1   2.92   20.31   5.10   3.91   63.74   0.84   2.92   4.39   99.84   0.949   2.25   1.30   0.32     未检出
  2   3.14   20.34   4.66   3.86   64.56   0.87   2.16   1.04   99.59   0.975   2.39   1.21   0.25     38.1
  3   1.56   19.85   5.18   3.40   65.84   1.37   2.72   1.80   99.92   0.943   2.31   1.52   0.31     21.9
注:f-c一游离CaO    Vso3-SO3挥发量
                    表3相应熟料物理性能

Claims (3)

1、一种高硫硅酸盐水泥,其熟料的氧化物中,主要成份是CaO、SO3、SiO2、Al2O3、Fe2O3、MgO,以质量百分比表示各成分时,其中SiO2为20~24%,Al2O3为3~6%,Fe2O3为2.5~5.0%,SO3为1.5~3.0%,CaO为63~68%,MgO为0.5~2.0%。
2、一种生产如权利要求1所述的高硫硅酸盐水泥的方法,将生料粉磨后煅烧成熟料,再粉磨成水泥,其特征是:
生料中各组分的质量百分比为:含有柠檬酸渣为4~6%、石灰石为78~80%、粘土为8~14%、铁矿石为4~7%;
整个工艺过程中将四大率值控制在以下范围:
石灰饱和系数KH:0.92~1.0
硅率SM(n):     1.90~2.50
铝率IM(p):     1.0~1.8
硫率SR:        0.18~0.32
其中: S &OverBar; R = SO 3 Al 2 O 3 + FeO 3
煅烧温度1350~1400℃。
3、如权利要求2所述的高硫硅酸盐水泥的生产方法,其特征是碱总量K值控制在0.25~1.00%。
CNB021388857A 2002-08-02 2002-08-02 高硫硅酸盐水泥及其生产方法 Expired - Fee Related CN1189414C (zh)

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Publication number Priority date Publication date Assignee Title
CN104446056A (zh) * 2014-12-11 2015-03-25 重庆市铜梁区杰明奥水泥制品有限公司 一种水泥栏杆的制作方法
CN108117282A (zh) * 2017-12-25 2018-06-05 葛洲坝宜城水泥有限公司 一种硅酸盐水泥熟料及其制备方法
WO2023165977A1 (en) 2022-03-01 2023-09-07 Südbayerisches Portland-Zementwerk Gebr. Wiesböck & Co. GmbH Method and plant for treating raw-meal in a cement clinker manufacturing process
EP4238948A1 (en) * 2022-03-01 2023-09-06 Südbayerisches Portland-Zementwerk Gebr. Wiesböck & Co. GmbH Method and plant for treating raw-meal in a cement clinker manufacturing process

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