CN112250422A - 一种以电熔镁坨脱模料为原料生产重烧镁砂的制备方法 - Google Patents

一种以电熔镁坨脱模料为原料生产重烧镁砂的制备方法 Download PDF

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CN112250422A
CN112250422A CN202011089764.4A CN202011089764A CN112250422A CN 112250422 A CN112250422 A CN 112250422A CN 202011089764 A CN202011089764 A CN 202011089764A CN 112250422 A CN112250422 A CN 112250422A
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程广旭
唐湘海
陈东明
张义先
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Haicheng Zhongxing Magnesium Synthetic Material Co ltd
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Abstract

本发明涉及一种以电熔镁坨脱模料为原料生产重烧镁砂的制备方法，生产原料按重量份：电熔脱模粉65‑80份，菱镁矿石粉15‑20份和重烧镁砂除尘粉15‑20份放入混碾机进行混碾；混碾后输送到压密机内于100‑150MPa初步压制成球，再于300‑350MP压制成原料球；原料球送入烘干塔进行烘干；将干燥后的原料球送进重烧竖窑内，每吨原料球内均匀混合加入60‑70公斤固体燃料进行煅烧，最高煅烧温度控制在1650℃以上，出窑间隔时间控制在3.5‑4小时，出窑深度1200‑1500mm。本发明对于电熔脱模后所产生的大量脱模料进行充分利用，大幅提高了菱镁矿资源的利用率。同时由于压制成原料球的原料灼碱低，有效降低重烧竖窑煅烧中所加入固体燃料的使用量，有利于节约资源。

Description

一种以电熔镁坨脱模料为原料生产重烧镁砂的制备方法
技术领域
本发明涉及镁砂制备技术领域，特别涉及一种以电熔镁坨脱模料为原料生产重烧镁砂的制备方法。
背景技术
目前重烧镁砂是选用天然菱镁矿石，经高温竖窑煅烧而成，它是生产不定型耐火材料的理想原料，制品用于炼钢平炉、电炉炉底和捣打炉衬。然而天然的菱铁矿资源由于不断的开采，商品级的菱镁矿已越来越少，如何加大菱镁矿资源利用率，将菱镁矿到菱镁制品产生的附属资源充分利用，是本发明需要解决的问题。
发明内容
本发明所要解决的技术问题是提供一种以电熔镁坨脱模料为原料生产重烧镁砂的制备方法，对电熔镁坨脱模料进行充分利用，大幅提高了菱镁矿资源的利用率。减少降低重烧竖窑煅烧中所加入固体燃料的使用量。
为实现上述目的，本发明采用以下技术方案实现：
一种以电熔镁坨脱模料为原料生产重烧镁砂的制备方法，包括以下步骤：
步骤一：生产原料按重量份：电熔脱模粉65-80份，菱镁矿石粉15-20份和重烧镁砂除尘粉15-20份放入混碾机进行混碾；
步骤二：混碾后输送到压密机内于100-150MPa初步压制成球，再于300-350MP压制成原料球；
步骤三；原料球送入烘干塔进行烘干；
步骤四；将干燥后的原料球送进重烧竖窑内，每吨原料球内均匀混合加入60-70公斤固体燃料进行煅烧，最高煅烧温度控制在1650℃以上，出窑间隔时间控制在3.5-4小时，出窑深度1200-1500mm。
步骤一中电熔脱模粉的粒度≤10mm，菱镁矿石粉的粒度≤15mm，重烧除尘粉的粒度为150-200目。
步骤一中原料灼减为39-42％。
步骤四中固体燃料为宁夏白煤或者焦炭，热值在6500大卡以上。
与现有的技术相比，本发明的有益效果是：
本发明制得重烧镁砂在性能上达到使用天然菱镁矿为原料生产的重烧镁砂。压制成的原料球代替了天然菱镁矿石作为重烧镁砂原料，可以对于电熔脱模后所产生的大量脱模料进行充分利用，大幅提高了菱镁矿资源的利用率。同时由于压制成原料球的原料灼碱相对于天然菱镁矿石低，可以有效降低重烧竖窑煅烧中所加入固体燃料的使用量，有利于节约资源，同时降低生产成本。
具体实施方式
下面结合实施例对本发明进一步说明：
以下实施例对本发明进行详细描述。这些实施例仅是对本发明的最佳实施方案进行描述，并不对本发明的范围进行限制。
实施例包括实施例1-3，表1是实施例中原料配比：
表1：原料配比(重量份)及原料球灼碱
配料 实施例1 实施例2 实施例3
电熔脱模粉 65份 70份 80份
菱镁矿石粉 15份 20份 10份
重烧镁砂除尘粉 20份 10份 10份
原料球灼碱/％ 31.02 29.54 28.47
三种原料的化学成分如表2所示：
表2：原料化学指标
Figure BDA0002721617470000021
实施例1的以电熔脱模粉为原料生产重烧镁砂的制备方法，具体步骤如下：
步骤一：将电熔脱模粉、菱镁矿石粉、重烧除尘粉三种原料按比例混合后放入混碾机进行混碾；
步骤二：经过充分混碾之后由输送带加入到高压压密机内于100MP下初步压制成球后再经过输送带加入高压压球机内于300MP下压制成球；
步骤三；压制好的球经过输送带送入烘干塔进行烘干；
步骤四；将干燥后的球通过爬斗提升机和旋转布料器进入到重烧竖窑内，每吨原料球内均匀混合加入65公斤固体燃料，按照重烧竖窑生产工艺进行煅烧，最高煅烧温度控制在1670℃，出窑间隔时间控制在4小时，出窑深度1200-1500mm；
步骤五；当料层表面呈锅底状，料面表层变白，窑火变弱出窑，烧结的镁砂经过出炉机出窑，再通过直线筛分级为筛上块料和筛下面料。
实施例2的以电熔脱模粉为原料生产重烧镁砂的制备方法，具体步骤如下：
步骤一：将电熔脱模粉、菱镁矿石粉、重烧除尘粉三种原料按比例混合后放入混碾机进行混碾；
步骤二：经过充分混碾之后由输送带加入到高压压密机内于110MP下初步压制成球后再经过输送带加入高压压球机内于310MP下压制成球；
步骤三；压制好的球经过输送带送入烘干塔进行烘干；
步骤四；将干燥后的球通过爬斗提升机和旋转布料器进入到重烧竖窑内，每吨原料球内均匀混合加入68公斤固体燃料，按照重烧竖窑生产工艺进行煅烧，最高煅烧温度控制在1650℃，出窑间隔时间控制在3.5小时，出窑深度1200-1500mm；
步骤五；当料层表面呈锅底状，料面表层变白，窑火变弱出窑，烧结的镁砂经过出炉机出窑，再通过直线筛分级为筛上块料和筛下面料。
实施例3的以电熔脱模粉为原料生产重烧镁砂的制备方法，具体步骤如下：
步骤一：将电熔脱模粉、菱镁矿石粉、重烧除尘粉三种原料按比例混合后放入混碾机进行混碾；
步骤二：经过充分混碾之后由输送带加入到高压压密机内于130MP下初步压制成球后再经过输送带加入高压压球机内于340MP下压制成球；
步骤三；压制好的球经过输送带送入烘干塔进行烘干；
步骤四；将干燥后的球通过爬斗提升机和旋转布料器进入到重烧竖窑内，每吨原料球内均匀混合加入70公斤固体燃料，按照重烧竖窑生产工艺进行煅烧，最高煅烧温度控制在1680℃，出窑间隔时间控制在4小时，出窑深度1200-1500mm；
步骤五；当料层表面呈锅底状，料面表层变白，窑火变弱出窑，烧结的镁砂经过出炉机出窑，再通过直线筛分级为筛上块料和筛下面料。
对拣选分级后的成品分别进行取样检测，实施例1-3成品的理化指标见表3。
表3：实施例1-3成品的理化指标及单吨镁砂耗煤量
实施例1 实施例2 实施例3
W(MgO)/％ 87 87.5 88
CaO/SiO2(摩尔比) 0.3 0.31 0.32
体积密度/g/cm3 3.2 3.1 3.3
单吨镁砂耗煤量kg 170 165 159
由上表可知，通过以电熔脱模粉为原料生产的重烧镁砂在性能上可以达到以天然菱镁矿石为原料生产重烧镁砂的性能。压制成的菱镁球代替了天然菱镁矿石作为重烧镁砂原料，可以对于电熔脱模所产生的大量脱模粉进行充分利用，大幅提高了菱镁矿资源的利用率。同时由于压制成菱镁球的灼碱相对于天然菱镁矿石要低，可以有效降低重烧竖窑煅烧中所加入固体燃料的使用量，有利于节约资源，同时降低生产成本。

Claims (4)

1.一种以电熔镁坨脱模料为原料生产重烧镁砂的制备方法，其特征在于，包括以下步骤：
步骤一：生产原料按重量份：电熔脱模粉65-80份，菱镁矿石粉15-20份和重烧镁砂除尘粉15-20份放入混碾机进行混碾；
步骤二：混碾后输送到压密机内于100-150MPa初步压制成球，再于300-350MP压制成原料球；
步骤三；原料球送入烘干塔进行烘干；
步骤四；将干燥后的原料球送进重烧竖窑内，每吨原料球内均匀混合加入60-70公斤固体燃料进行煅烧，最高煅烧温度控制在1650℃以上，出窑间隔时间控制在3.5-4小时，出窑深度1200-1500mm。
2.根据权利要求1所述的一种以电熔镁坨脱模料为原料生产重烧镁砂的制备方法，其特征在于，步骤一中电熔脱模粉的粒度≤10mm，菱镁矿石粉的粒度≤15mm，重烧除尘粉的粒度为150-200目。
3.根据权利要求1所述的一种以电熔镁坨脱模料为原料生产重烧镁砂的制备方法，其特征在于，步骤一中原料灼减为39-42％。
4.根据权利要求1所述的一种以电熔镁坨脱模料为原料生产重烧镁砂的制备方法，其特征在于，步骤四中固体燃料为宁夏白煤或者焦炭，热值在6500大卡以上。
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