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浅析石灰石在釉面砖坯体中的主要作用

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    2019-6-7 14:30
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    [LV.6]常住居民II

    发表于 2019-5-24 19:53:46 | 显示全部楼层 |阅读模式
    石灰石是绝大多数釉面砖坯体配方中必用的重要原料,其主要成份为CaCO₃。

    CaCO₃,主要存在于石灰石和方解石两种矿物,都在900-950℃间分解,CaCO₃,Ca0+CO2。

    一般说来,石灰石的纯度低,适用于坯体;方解石的纯度高,适用于釉料。



    石灰石在釉面砖坯体中的主要作用如下:

    (1)分解前在坯体中起瘠性料作用;
    (2)加热分解后起熔剂作用,与坯体中的粘土和石英在较低的温度下反应,缩短烧成时间;
    (3)提高坯体的膨胀系数,利于坯釉结合;
    (4)提高坯釉中间层的生成量;
    (5)减少制品的烧成收缩,利于提高产品的规整度;
    (6)可使坯体漂白,提高产品的白度;
    (7)减少坯体的吸湿膨胀。

    石灰石在坯体中的用量一般在10%左右。与其它原料配合使用时,适当增减其用量;如同时使用透辉石、硅灰石,可以减少石灰石用量,甚至可以不用。

    我国的石灰石资源极为丰富,全国各地分布广泛,用作坏体一般都合适。白云石与石灰石的性能相似,可以代替石灰石使用。由于白云石中同时含有氧化钙和氧化镁,产品的抗龟裂性能更好。

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    发表于 2020-9-4 16:55:22 | 显示全部楼层

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    发表于 2020-9-8 16:30:33 | 显示全部楼层

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    If you’re crumbling enough to retain Kesha’s “Tik Tok,” you may not be “time-worn” by the type precision—the ado not came discernible in 2009—but you’re very likely still too ancient to cognizant of with reference to the other TikTok, the app of the that having been said name. Teenagers and young people are the first-class users of the app, which can loosely be described as a social network with a view dilettante music videos (users can rush at their own as cooked through as even-handed on one's guard for all else’s). If you know yon it at all, it influence be by its late name, Musical.ly. So why is it called something else now? What distinguishes it from the other apps that teens are obsessed with? Is it extremely value a billion dollars? And are amateur music videos any good?
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    发表于 2020-9-9 00:05:30 | 显示全部楼层

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    If you’re old reasonably to about Kesha’s “Tik Tok,” you may not be “expert” by the standard explication—the ado contrariwise came discernible in 2009—but you’re probably noiseless too old to certain regarding the other TikTok, the app of the yet name. Teenagers and minor people are the first-class users of the app, which can loosely be described as a social network for amateur music videos (users can along their own as cooked through as even-handed watch everyone else’s). If you distinguish there it at all, it muscle be nearby its late name, Musical.ly. So why is it called something else now? What distinguishes it from the other apps that teens are obsessed with? Is it really value a billion dollars? And are unpaid music videos any good?
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    发表于 2020-9-9 07:02:26 | 显示全部楼层

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