LIU Haipei, LI Zhong, SHEN Yuesong, et al. Effects of different admixtures on performance of titanium-based ceramics prepared by waste denitrification catalyst[J]. Thermal power generation, 2017, 46(7): 66-71.
DOI:
LIU Haipei, LI Zhong, SHEN Yuesong, et al. Effects of different admixtures on performance of titanium-based ceramics prepared by waste denitrification catalyst[J]. Thermal power generation, 2017, 46(7): 66-71.DOI:
Effects of different admixtures on performance of titanium-based ceramics prepared by waste denitrification catalyst
摘要
我国每年产生大量的废弃脱硝催化剂
其安全处置和资源化利用迫在眉睫。钒钛脱硝催化剂中的TiO_2含量较高
以其作原料制备陶瓷
可实现高附加值利用。本文以包头某火电厂的蜂窝式废弃钒钛脱硝催化剂为原料
选取CuO、硼砂、Nb_2O_5 3种外加剂用于制备钛基陶瓷
通过样品体积密度、吸水率、抗压强度、抗弯强度、维氏硬度和有毒元素浸出率测试
研究3种外加剂对钛基陶瓷性能的影响。结果表明:CuO的掺杂不利于样品的致密化
掺杂2%硼砂可大幅度提高样品硬度;掺杂2%Nb_2O_5的样品综合性能最佳
有毒元素浸出率达到国家标准;利用以废弃钒钛催化剂为原料高温焙制陶瓷的方法
对有毒V元素的浸出起到了明显的固化效果。
Abstract
Large amount of abandoned denitration catalysts are produced in China every year
the safety dispose and resource utilization of them becomes urgent. The TiO_2 content in vanadium titanium denitration catalyst is critically high
which could be used as raw material for ceramic preparation to realize high value-added utilization. In this paper
the waste vanadium titanium denitration catalyst from a coal-fired power plant in Baotou was used for raw materials for preparation of titanium base ceramic
and the CuO
borax and Nb_2O_5 were used as admixtures. Through the tests of volume density
water absorption
compressive strength
bending strength
Vickers hardness and leaching rate of toxic elements
the influence of admixtures was studied. The results show that
the CuO doping went against the samples' densification
doping borax with concentration of 2% improved the sample hardness sharply
the 2% Nb_2O_5 doped samples performed the best
of which the leaching rate of toxic elements reached the national standard. The high temperature heated method using waste vanadium titanium denitration catalyst as raw materials has an obvious effect in solidification of the toxic V elements.