CN1093694A - 还原法煅烧高岭土新工艺 - Google Patents
还原法煅烧高岭土新工艺 Download PDFInfo
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- CN1093694A CN1093694A CN 94101859 CN94101859A CN1093694A CN 1093694 A CN1093694 A CN 1093694A CN 94101859 CN94101859 CN 94101859 CN 94101859 A CN94101859 A CN 94101859A CN 1093694 A CN1093694 A CN 1093694A
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Abstract
本发明提供一种还原法煅烧高岭土用金属粉末
作还原剂的新工艺。本新工艺可在低转化温度下还
原煅烧获得高白度的产品,使产品色泽纯白、比表面
积大、磨损性低。
Description
本发明是还原法煅烧高岭土新工艺,特别是对成份较差为原料提高白度的煅烧高岭土新工艺。
目前、煅烧高岭土是通过对精选后的高岭土加热脱水而得,提高白度的煅烧方法已知有①,在转窑构成的煅烧体系中,用碳或碳水化合物(如:淀粉、木屑)作还原剂,掺入原料中以使原料在氧化性煅烧气氛中,在物料颗粒周围能形成一层还原保护层;②若是推板窑煅烧体系中,则把物料装在密闭的钵体中,在原料中混合以上①所说的还原剂,以保持密闭体的还原气氛。这样,原料在煅烧中铁的颜色被还原淡化而得到白度的产品。其还原的煅烧机理,是利用碳将活性氧除去,见下面反应式:
因此,用碳或碳水化合物作还原剂,煅烧温度在1000℃以上,高于高岭土石的晶形转化温度970℃,对产品有高磨耗,比表面积小的缺点;若煅烧温度低于1000℃,未被还原的三氧化二铁及原来(或生成)的碳黑又会大大降低产品的白度。
本发明的目的,就是提供一种还原法煅烧高岭土新工艺。该工艺中还原法煅烧高岭土用金属粉末作还原剂便可获得高白度的产品。
本发明的目的是这样实现的:在还原法煅烧高岭土体系中,不用碳或碳水化合物作还原剂,避免出现碳黑在低于1000℃以下不反应挥发而污染产品,采用金属粉末,如:铝粉、锌粉(或其氧化物为白色的,可一种或几种同用)作还原剂,掺入量据原料中铁及水的含量定,一般在0.1-10%(以原料烧透为度)。其原理是由于金属粉末有很强的活性,在低温时就能与氧反应使体系中处在中性或还原性气氛中,且高岭土在400-600℃之间脱水生成的水汽也与其反应形成的氢气,同样具有强还原性(而碳与水汽在此温度是不反应的),使在低转化温度下,如:800-900℃之间还原高岭土中的铁而不带入其他颜色,见掺入锌粉或铝粉的反应式如下:
所以,金属粉末为还原剂比用碳或碳水化合物作还原剂更具优越性。
实施例1,用高岭土矿精选土作煅烧原料,放入电炉中,保持氧化气氛,温度为850℃,煅烧3小时,得样品用BDJ型白度计测白度值为79.4度,色泽偏黄;若用0.5%的锌粉掺入原料中,装入有盖的不锈钢杯中,在炉中煅烧条件相同,所得的样品白度值为87.2度,色泽纯白,与前不用金属粉未作还原剂的结果比较,后者白度提高7.8度。
实施例2,用高岭土矿为原料,放入电炉中煅烧,以淀粉(碳水化合物)作还原剂,温度为950℃,煅烧3小时,得样品经测白度值为78.3度,色泽浅灰色(样品中含少量未反应挥发的碳);当用锌粉作还原剂,掺入原料中的量分别为0.5%、1.0%,装入有盖的不锈钢杯中,在炉中煅烧条件相同,所得的样品白度值分别为89.0度、89.9度,与前用碳水化合物作还原剂的结果比较,后者白度值提高10.7度及11.6度。
本新工艺还原法煅烧高岭土,可提高产品的白度,色泽纯白,且可在低于970℃的高岭石向莫来石的转化温度下煅烧,使产品比表面积大、磨损性低。
Claims (2)
1、一种还原法煅烧高岭土新工艺,其特征在于还原法煅烧高岭土体系中,用金属粉末铝粉或锌粉(其氧化物为白色的)掺入原料中作还原剂。
2、如权利要求1所述的新工艺,其特征在于还原剂可以是一种或几种同用,加入量在0.1-10%之间。
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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CN 94101859 CN1093694A (zh) | 1994-02-14 | 1994-02-14 | 还原法煅烧高岭土新工艺 |
Applications Claiming Priority (1)
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CN 94101859 CN1093694A (zh) | 1994-02-14 | 1994-02-14 | 还原法煅烧高岭土新工艺 |
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CN1093694A true CN1093694A (zh) | 1994-10-19 |
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CN 94101859 Pending CN1093694A (zh) | 1994-02-14 | 1994-02-14 | 还原法煅烧高岭土新工艺 |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104787775A (zh) * | 2015-04-16 | 2015-07-22 | 内蒙古师范大学 | 一种大孔径、固定形态高岭土表面改性方法 |
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1994
- 1994-02-14 CN CN 94101859 patent/CN1093694A/zh active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104787775A (zh) * | 2015-04-16 | 2015-07-22 | 内蒙古师范大学 | 一种大孔径、固定形态高岭土表面改性方法 |
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