CN108948792A - 一种适于聚合物生产的微粉碳酸钙的制备方法 - Google Patents
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Abstract
本发明公开了一种适于聚合物生产的微粉碳酸钙的制备方法,包括以下步骤:粗碎和粉碎;蒸汽气流磨进行粉碎;通入蒸汽;气流干燥机中干燥,即得微粉碳酸钙。本发明生产得率高,且能提高大大提高微粉碳酸钙与聚合物的相容性。
Description
技术领域
本发明涉及一种碳酸钙的制备方法,尤其是一种适于聚合物生产的微粉碳酸钙的制备方法。
背景技术
重质碳酸钙,一般是由天然碳酸盐矿物如方解石、大理石和石灰石粉碎而制得,重钙具有白度高、纯度好、色相柔和等特点,因此被广泛用于人造地砖、橡胶、塑料、造纸、涂料、油漆、油墨、电缆、建筑用品、食品、医药、纺织、饲料、牙膏等行业,通常用作填充剂,或者是补强剂。
根据碳酸钙粉体平均粒径(d)的大小,可以将碳酸钙分为微粒碳酸钙(d>5μm)、微粉碳酸钙(1μm<d<5μm)、微细碳酸钙(0.1μm<d≤1μm)、超细碳酸钙(0.02μm<d≤0.1μm)和超微细碳酸钙(d≤0.02μm)。
目前重质碳酸钙一般采用干法生产工艺流程和湿法工艺流程,干法生产工艺流程是先将方解石等原料用破碎机进行粗破碎,再用雷蒙(摆式)磨粉碎得到细石灰石粉,租后用分级机分级,湿法工艺流程是先将干法细粉制成悬浮液置于磨机内进一步粉碎,经脱水、干燥后边制得超细重质碳酸钙。但是上述生产方法得到的碳酸钙具有亲水疏油的性质,与橡胶、塑料制品基体材料的亲和性较差,导致聚合物的材料强度不足、稳定性较差。
发明内容
本发明公开了一种适于聚合物生产的微粉碳酸钙的制备方法,生产得率高,且能提高其与聚合物的相容性。
为实现上述目的,本发明的技术方案为:
一种适于聚合物生产的微粉碳酸钙的制备方法,包括以下步骤:
S1. 对方解石原料进行粗碎和粉碎,得到100~200目的方解石粉体;
S2.将方解石粉体送入蒸汽气流磨进行粉碎,蒸汽气流磨中,过热蒸汽的温度为200℃~235℃、压力为0.8MPa~1MPa,粉碎后分级得粒径为0.3~5μm超微粉体;
S3.将超微粉体放置于蒸汽室中,通入蒸汽3~10min,蒸汽的成分由乙腈、二氧化碳和水组成;
S4.将蒸汽处理后的超微粉体放入气流干燥机中干燥,即得微粉碳酸钙。
优选的,所述步骤S3中,蒸汽的温度为90~100℃。
优选的,所述步骤S3中,乙腈蒸汽的流量为1~5g/min,二氧化碳的流量为5~15/min,水的流量为20~30g/min。更优选的,所述步骤S4中,乙腈蒸汽的流量为2g/min,二氧化碳的流量为6 g/min,水的流量为25g/min。
优选的,所述步骤S4中,气流干燥机中干燥管的温度为100~120℃、气流速度为20~30m/s。
以上所述的适于聚合物生产的微粉碳酸钙的制备方法,具有以下优点:
(1)本发明采用蒸汽气流磨进行粉碎,以水蒸气为介质对方解石粉体进行气流粉碎,粉碎速度快,产品得率高,经筛分99.5%达到粒径要求。
(2)本发明通过通入乙腈、二氧化碳及水蒸汽对粉体进行表面改性,能大大减少碳酸钙在干燥过程中发生团聚现象的几率,且还能进一步改善粉体的吸油性,并使其能与橡胶、塑料制品等聚合物基体材料具有较好的相容性,从而帮助提高下游产品的强度、稳定性。
(3)本发明通过采用气流干燥机对碳酸钙进行干燥,加快了干燥的速度,也能避免干燥过后需再次进行回抖的问题。
具体实施方式
以下将结合具体实施例对本发明作进一步说明,但本发明的保护范围不限于以下实施例。
实施例1
一种适于聚合物生产的微粉碳酸钙的制备方法,包括以下步骤:
S1. 对方解石原料进行粗碎和粉碎,得到100~200目的方解石粉体;
S2.将方解石粉体送入蒸汽气流磨进行粉碎,蒸汽气流磨中,过热蒸汽的温度为220℃、压力为1MPa,粉碎后分级得粒径为0.3~5μm超微粉体;
S3.将超微粉体放置于蒸汽室中,通入蒸汽8min,蒸汽由以下成分组成:乙腈蒸汽的流量为2g/min,二氧化碳的流量为6 g/min,水的流量为25g/min,温度为95℃;
S4.将蒸汽处理后的超微粉体放入气流干燥机中干燥,气流干燥机中干燥管的温度为105℃、气流速度为25m/s,干燥后即得微粉碳酸钙。
实施例2
一种适于聚合物生产的微粉碳酸钙的制备方法,包括以下步骤:
S1. 对方解石原料进行粗碎和粉碎,得到100~200目的方解石粉体;
S2.将方解石粉体送入蒸汽气流磨进行粉碎,蒸汽气流磨中,过热蒸汽的温度为200℃、压力为0.9MPa,粉碎后分级得粒径为0.3~5μm超微粉体;
S3.将超微粉体放置于蒸汽室中,通入蒸汽3min,蒸汽由以下成分组成:乙腈蒸汽的流量为5g/min,二氧化碳的流量为15 g/min,水的流量为30g/min,温度为90℃;
S4.将蒸汽处理后的超微粉体放入气流干燥机中干燥,气流干燥机中干燥管的温度为100℃、气流速度为30m/s,干燥后即得微粉碳酸钙。
实施例3
一种适于聚合物生产的微粉碳酸钙的制备方法,包括以下步骤:
S1. 对方解石原料进行粗碎和粉碎,得到100~200目的方解石粉体;
S2.将方解石粉体送入蒸汽气流磨进行粉碎,蒸汽气流磨中,过热蒸汽的温度为235℃、压力为1MPa,粉碎后分级得粒径为0.3~5μm超微粉体;
S3.将超微粉体放置于蒸汽室中,通入蒸汽10min,蒸汽由以下成分组成:乙腈蒸汽的流量为1g/min,二氧化碳的流量为5 g/min,水的流量为20g/min,温度为100℃;
S4.将蒸汽处理后的超微粉体放入气流干燥机中干燥,气流干燥机中干燥管的温度为120℃、气流速度为20m/s,干燥后即得微粉碳酸钙。
实施例4
一种适于聚合物生产的微粉碳酸钙的制备方法,包括以下步骤:
S1. 对方解石原料进行粗碎和粉碎,得到100~200目的方解石粉体;
S2.将方解石粉体送入蒸汽气流磨进行粉碎,蒸汽气流磨中,过热蒸汽的温度为220℃、压力为1MPa,粉碎后分级得粒径为0.3~5μm超微粉体;
S3.超微粉体放入气流干燥机中干燥,气流干燥机中干燥管的温度为105℃、气流速度为25m/s,干燥后即得微粉碳酸钙。
上述实施例1~3中,干燥后所得的微粉碳酸钙无需回抖,经检测粒径均在0.3~5μm之间,无团聚现象。
上述实施例1~3制得的微粉碳酸钙,与实施例4制得的微粉碳酸钙相比,得到实施例1制备的微粉碳酸钙比实施例4制备的微粉碳酸钙吸油值降低了52.1%,沉降体积降低了66.9%,粘度降低了60.5%,堆积密度降低14.9%;得到实施例2制备的微粉碳酸钙比实施例4制备的微粉碳酸钙吸油值降低了49.6%,沉降体积降低了60.2%,粘度降低了53.9%,堆积密度降低13.1%;得到实施例2制备的微粉碳酸钙比实施例4制备的微粉碳酸钙吸油值降低了50.3%,沉降体积降低了63.7%,粘度降低了58.1%,堆积密度降低13.6%。这说明改性后的微粉碳酸钙与聚合物具有很好的相容性,且堆积密度变小,能证明碳酸钙分散性能好,不易团聚。
Claims (5)
1.一种适于聚合物生产的微粉碳酸钙的制备方法,其特征在于包括以下步骤:
S1. 对方解石原料进行粗碎和粉碎,得到100~200目的方解石粉体;
S2.将方解石粉体送入蒸汽气流磨进行粉碎,蒸汽气流磨中,过热蒸汽的温度为200℃~235℃、压力为0.8MPa~1MPa,粉碎后分级得粒径为0.3~5μm超微粉体;
S3.将超微粉体放置于蒸汽室中,通入蒸汽3~10min,蒸汽的成分由乙腈、二氧化碳和水组成;
S4.将蒸汽处理后的超微粉体放入气流干燥机中干燥,即得微粉碳酸钙。
2.根据权利要求1所述的适于聚合物生产的微粉碳酸钙的制备方法,其特征在于:所述步骤S3中,蒸汽的温度为90~100℃。
3.根据权利要求1所述的适于聚合物生产的微粉碳酸钙的制备方法,其特征在于:所述步骤S3中,乙腈蒸汽的流量为1~5g/min,二氧化碳的流量为5~15/min,水的流量为20~30g/min。
4.根据权利要求1所述的适于聚合物生产的微粉碳酸钙的制备方法,其特征在于:所述步骤S4中,气流干燥机中干燥管的温度为100~120℃、气流速度为20~30m/s。
5. 根据权利要求3所述的适于聚合物生产的微粉碳酸钙的制备方法,其特征在于:所述步骤S4中,乙腈蒸汽的流量为2g/min,二氧化碳的流量为6 g/min,水的流量为25g/min。
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CN101775238A (zh) * | 2010-01-29 | 2010-07-14 | 大连友兰企业集团有限公司 | 活性超细研磨碳酸钙加工方法 |
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CN105348861A (zh) * | 2015-10-23 | 2016-02-24 | 谭乔 | 一种功能碳酸钙粉体及其生产方法 |
CN206652581U (zh) * | 2017-04-11 | 2017-11-21 | 福建弘高石粉综合利用有限公司 | 一种用于对矿石粉体进行粉碎的微粉冲击磨机 |
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CN101775238A (zh) * | 2010-01-29 | 2010-07-14 | 大连友兰企业集团有限公司 | 活性超细研磨碳酸钙加工方法 |
CN104744971A (zh) * | 2015-03-04 | 2015-07-01 | 江西科越科技有限公司 | 湿法超微细改性碳酸钙制备工艺 |
CN105348861A (zh) * | 2015-10-23 | 2016-02-24 | 谭乔 | 一种功能碳酸钙粉体及其生产方法 |
CN206652581U (zh) * | 2017-04-11 | 2017-11-21 | 福建弘高石粉综合利用有限公司 | 一种用于对矿石粉体进行粉碎的微粉冲击磨机 |
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