CN106630993A - 加钙铁红预烧料的制备方法 - Google Patents
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Abstract
本发明加钙铁红预烧料的制备方法,包括以下步骤:将由铁红、碳酸锶、碳酸钙、白炭黑和活性氧化铝组成的原料加入硼酸进行湿法混磨得到浆料;对回转窑进行升温预热,当回转窑内温度达到计划预烧温度并稳定2h后,将步骤a中所得浆料以11~12kg/min的进料量通入回转窑中进行预烧,控制回转窑变频器频率为160~240Hz,回转窑的转速为55~71秒/转;浆料在回转窑内经过1100~1300℃的高温生成预烧料,出窑冷却后利用筛网进行筛分;将预烧料送入干式球磨机进行粉碎处理。本发明对预烧时回转窑的工艺参数进行优化,在保证进料量稳定的前提下,制得的预烧料收缩率稳定、波动范围小,磁特性良好。
Description
技术领域
本发明涉及永磁铁氧体生产领域,尤其是一种加钙铁红预烧料的制备方法。
背景技术
永磁铁氧体的生产一般包括预烧料生产和磁件生产两个过程,其中预烧料的生产过程为初步铁氧化过程,磁件生产为产品成型和最终定型过程;在预烧料生产过程中,产品的铁氧化程度决定了预烧料的质量和收缩率,也影响到磁件产品的质量合格率和成材率。目前,预烧料的磁特性和收缩率为厂家主要考虑的因素,磁特性由Br(剩磁,即剩余磁化强度的简称)、Hcb(磁感矫顽力)和Hcj(内稟矫顽力)三种参数指标进行考量,目前生产工艺所制得的预烧料产品的收缩率总体偏大且波动较大。
发明内容
本发明所要解决的技术问题是:提供一种加钙铁红预烧料的制备方法。
为解决上述技术问题本发明所采用的技术方案是:加钙铁红预烧料的制备方法,包括以下步骤:
a、将由铁红、碳酸锶、碳酸钙、白炭黑和活性氧化铝组成的原料加入硼酸进行湿法混磨得到浆料;
b、对回转窑进行升温预热,当回转窑内温度达到计划预烧温度并稳定2h后,将步骤a中所得浆料以11~12kg/min的进料量通入回转窑中进行预烧,控制回转窑变频器频率为160~240Hz,回转窑的转速为55~71秒/转;
c、浆料在回转窑内经过1100~1300℃的高温生成预烧料,出窑冷却后利用筛网进行筛分;
d、将预烧料送入干式球磨机进行粉碎处理。
进一步的是:步骤a中各原料的主要成分按质量百分比计为:铁红中Fe2O3≥98%、碳酸锶中SrCO3≥97%、碳酸钙中CaCO3≥98%、白炭黑中SiO2≥90%、活性氧化铝中Al2O3≥90%,硼酸中H3BO3≥99%。
进一步的是:步骤a中各原料的粒度为:铁红粒度≤2.0μm,碳酸锶粒度≤3.0μm,碳酸钙粒度≤2.0μm,白炭黑粒度≤2.0μm,活性氧化铝粒度≤2.0μm。
进一步的是:步骤b中回转窑变频器的频率控制为180~200Hz。
本发明的有益效果是:本发明以铁红和碳酸锶为原料,加入碳酸钙、白炭黑、活性氧化铝和硼酸作为添加剂,并对预烧时回转窑的工艺参数进行优化,在保证进料量稳定的前提下,制得的预烧料收缩率稳定、波动范围小,磁特性良好。
具体实施方式
为了便于理解本发明,下面结合实施例对本发明进行进一步的说明。
本发明加钙铁红预烧料的制备方法,包括以下步骤:
a、将由铁红、碳酸锶、碳酸钙、白炭黑和活性氧化铝组成的原料加入硼酸进行湿法混磨得到浆料;
b、对回转窑进行升温预热,当回转窑内温度达到计划预烧温度并稳定2h后,将步骤a中所得浆料以11~12kg/min的进料量通入回转窑中进行预烧,控制回转窑变频器频率为160~240Hz,回转窑的转速为55~71秒/转;
c、浆料在回转窑内经过1100~1300℃的高温生成预烧料,出窑冷却后利用筛网进行筛分,其中筛分出的预烧料球料直径≥20mm的为大块料,直径<2mm的为细颗粒,其余为粗颗粒;
d、将预烧料送入干式球磨机进行粉碎处理。
步骤a中各原料的主要成分按质量百分比计为:铁红中Fe2O3≥98%、碳酸锶中SrCO3≥97%、碳酸钙中CaCO3≥98%、白炭黑中SiO2≥90%、活性氧化铝中Al2O3≥90%,硼酸中H3BO3≥99%。
步骤a中各原料的粒度为:铁红粒度≤2.0μm,碳酸锶粒度≤3.0μm,碳酸钙粒度≤2.0μm,白炭黑粒度≤2.0μm,活性氧化铝粒度≤2.0μm。
实施例1
将3组由铁红、碳酸锶、碳酸钙、白炭黑和活性氧化铝组成的原料加入硼酸进行湿法混磨得到浆料;对回转窑进行升温预热,当回转窑内温度达到计划预烧温度并稳定2h后,将步骤a中所得浆料以11~12kg/min的进料量通入回转窑中进行预烧,控制回转窑变频器频率为160Hz,回转窑的转速为70.3秒/转;预烧完成并进行冷却后,对预烧料进行检验,所得各参数如表1:
表1实施例1各检验参数
实施例2
将3组由铁红、碳酸锶、碳酸钙、白炭黑和活性氧化铝组成的原料加入硼酸进行湿法混磨得到浆料;对回转窑进行升温预热,当回转窑内温度达到计划预烧温度并稳定2h后,将步骤a中所得浆料以11~12kg/min的进料量通入回转窑中进行预烧,控制回转窑变频器频率为180Hz,回转窑的转速为66.8秒/转;预烧完成并进行冷却后,对预烧料进行检验,所得各参数如表2:
表2实施例2各检验参数
实施例3
将3组由铁红、碳酸锶、碳酸钙、白炭黑和活性氧化铝组成的原料加入硼酸进行湿法混磨得到浆料;对回转窑进行升温预热,当回转窑内温度达到计划预烧温度并稳定2h后,将步骤a中所得浆料以11~12kg/min的进料量通入回转窑中进行预烧,控制回转窑变频器频率为200Hz,回转窑的转速为63.2秒/转;预烧完成并进行冷却后,对预烧料进行检验,所得各参数如表3:
表3实施例3各检验参数
实施例4
将3组由铁红、碳酸锶、碳酸钙、白炭黑和活性氧化铝组成的原料加入硼酸进行湿法混磨得到浆料;对回转窑进行升温预热,当回转窑内温度达到计划预烧温度并稳定2h后,将步骤a中所得浆料以11~12kg/min的进料量通入回转窑中进行预烧,控制回转窑变频器频率为220Hz,回转窑的转速为59.7秒/转;预烧完成并进行冷却后,对预烧料进行检验,所得各参数如表4:
表4实施例4各检验参数
实施例5
将3组由铁红、碳酸锶、碳酸钙、白炭黑和活性氧化铝组成的原料加入硼酸进行湿法混磨得到浆料;对回转窑进行升温预热,当回转窑内温度达到计划预烧温度并稳定2h后,将步骤a中所得浆料以11~12kg/min的进料量通入回转窑中进行预烧,控制回转窑变频器频率为240Hz,回转窑的转速为55.6秒/转;预烧完成并进行冷却后,对预烧料进行检验,所得各参数如表5:
表5实施例5各检验参数
由上述5个实施例共15组样本所得检验参数可知,本发明制备方法所得预烧料的收缩率为12.50~13.20%之间,波动范围极小,数值较为稳定;目前我厂所制永磁铁氧体对预烧料的性能参数最佳要求为Br≥4.05KGs、Hcb≥3.25KOe、Hcj≥3.45KOe、收缩率为12.5~13.0%,由上述15组样本可知要得到满足本厂永磁铁氧体制备要求的最佳参数,步骤b中回转窑变频器的频率应控制为180~200Hz。
Claims (4)
1.加钙铁红预烧料的制备方法,其特征在于:包括以下步骤:
a、将由铁红、碳酸锶、碳酸钙、白炭黑和活性氧化铝组成的原料加入硼酸进行湿法混磨得到浆料;
b、对回转窑进行升温预热,当回转窑内温度达到计划预烧温度并稳定2h后,将步骤a中所得浆料以11~12kg/min的进料量通入回转窑中进行预烧,控制回转窑变频器频率为160~240Hz,回转窑的转速为55~71秒/转;
c、浆料在回转窑内经过1100~1300℃的高温生成预烧料,出窑冷却后利用筛网进行筛分;
d、将预烧料送入干式球磨机进行粉碎处理。
2.如权利要求1所述的加钙铁红预烧料的制备方法,其特征在于:步骤a中各原料的主要成分按质量百分比计为:铁红中Fe2O3≥98%、碳酸锶中SrCO3≥97%、碳酸钙中CaCO3≥98%、白炭黑中SiO2≥90%、活性氧化铝中Al2O3≥90%,硼酸中H3BO3≥99%。
3.如权利要求1或2所述的加钙铁红预烧料的制备方法,其特征在于:步骤a中各原料的粒度为:铁红粒度≤2.0μm,碳酸锶粒度≤3.0μm,碳酸钙粒度≤2.0μm,白炭黑粒度≤2.0μm,活性氧化铝粒度≤2.0μm。
4.如权利要求1所述的加钙铁红预烧料的制备方法,其特征在于:步骤b中回转窑变频器的频率控制为180~200Hz。
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