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 PDF

Info

Publication number
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
Authority
CN
China
Prior art keywords
calcining
reduction method
kaolin
reductive agent
powder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN 94101859
Other languages
English (en)
Inventor
李学东
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Building Material Science Research & Design Academy Guangxi Zhuang Nationality
Original Assignee
Building Material Science Research & Design Academy Guangxi Zhuang Nationality
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Building Material Science Research & Design Academy Guangxi Zhuang Nationality filed Critical Building Material Science Research & Design Academy Guangxi Zhuang Nationality
Priority to CN 94101859 priority Critical patent/CN1093694A/zh
Publication of CN1093694A publication Critical patent/CN1093694A/zh
Pending legal-status Critical Current

Links

Landscapes

  • Silicates, Zeolites, And Molecular Sieves (AREA)

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。
CN 94101859 1994-02-14 1994-02-14 还原法煅烧高岭土新工艺 Pending CN1093694A (zh)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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)

Application Number Priority Date Filing Date Title
CN 94101859 CN1093694A (zh) 1994-02-14 1994-02-14 还原法煅烧高岭土新工艺

Publications (1)

Publication Number Publication Date
CN1093694A true CN1093694A (zh) 1994-10-19

Family

ID=5030391

Family Applications (1)

Application Number Title Priority Date Filing Date
CN 94101859 Pending CN1093694A (zh) 1994-02-14 1994-02-14 还原法煅烧高岭土新工艺

Country Status (1)

Country Link
CN (1) CN1093694A (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
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

Cited By (1)

* Cited by examiner, † Cited by third party
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

Similar Documents

Publication Publication Date Title
CA2320155A1 (en) Process for preparing lithium transition metallates
AU569631B2 (en) Production of iron oxide catalyst
CN1093694A (zh) 还原法煅烧高岭土新工艺
JPS6461301A (en) Production of hydrogen gas
EP0189889A3 (en) Process for producing cement clinker
El-Shobaky et al. Solid-solid interactions between ferric oxide and lithium carbonate and the thermal stability of the lithium ferrites produced
AU727893B2 (en) Sulphur compounds coated with a zinc compound for use as pigments
KR100218662B1 (ko) 굴패각을 이용한 분말형 담체의 제조방법
US4045205A (en) Method for the manufacture of soil modifiers from waste material of the manufacture of titanium dioxide
GB2159805A (en) Method of producing a sinterable gamma -LiAlO2 powder
Liu et al. In Situ Synthesis of Yttria‐Stabilized Tetragonal Zirconia Polycrystal Powder Containing Dispersed Titanium Carbide by Selective Carbonization
US3793036A (en) Method of producing rapid-hardening cement
JPS5466314A (en) Manufacture of reduced pellets
JPS6236061A (ja) セラミツクス用着色剤
JPS54136587A (en) Production of exhaust gas cleaning catalyst
Itoh Role of CuO for the decarbonation of BaCO 3 and CaCO 3 in the solid-state reaction of CuO with BaCO 3 and that of CuO with CaCO 3.
JPS55121993A (en) Producing non-porous alumina-based single crystal abrasive grain
Wang et al. Synthesis and characterisation of MgAl2O4 spinel ceramic precursor
Navio et al. Thermal evolution of (Zr, Ti) O 2 gels synthesized at different basic pH
KR870001439B1 (ko) 경소 마그네시아의 제조방법
JPS56145119A (en) Preparation of chromia-alumina type oxide
JPS6445725A (en) Production of titanium oxide burned product
Masood et al. THERMOGRAVIMETRIC STUDY OF KINETIC PARAMETERS OF DECARBONATION OF LIMESTONES OF JAMMU AND KASHMIR
JPS6445726A (en) Production of titanium oxide burned product
Svatovskaya et al. “ALUMPHS”-NEW SPECIAL COMPOSITE BINDERS FOR DESIGNS

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C01 Deemed withdrawal of patent application (patent law 1993)
WD01 Invention patent application deemed withdrawn after publication