CN106630993A - 加钙铁红预烧料的制备方法 - Google Patents

加钙铁红预烧料的制备方法 Download PDF

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CN106630993A
CN106630993A CN201611254463.6A CN201611254463A CN106630993A CN 106630993 A CN106630993 A CN 106630993A CN 201611254463 A CN201611254463 A CN 201611254463A CN 106630993 A CN106630993 A CN 106630993A
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iron oxide
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蒲光文
李国胜
刘泽贵
谢德富
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Panzhihua Gangcheng Group Co Ltd
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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

加钙铁红预烧料的制备方法
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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