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Composite chrome corundum brick for chemical salt-containing wastewater incinerator and preparation method of composite chrome corundum brick
The invention relates to a composite chrome corundum brick for a chemical salt-containing wastewater incinerator and a preparation method of the composite chrome corundum brick, and belongs to the field of refractory materials. The composite chrome corundum brick is prepared by the following steps: by taking regenerated refractory raw material electro-fused chrome corundum with the particle size of less than or equal to 3mm, electro-fused white corundum with the particle size of less than or equal to 3mm, chromic oxide micro powder with the particle size of less than or equal to 8 microns, hercynite micro powder with the particle size of less than or equal to 31 microns and aluminum oxide micro powder with the particle size of less than or equal to 4 microns as raw materials, adding a binding agent, pressing into a green body, preserving heat in a high-temperature furnace at 1500-1600 DEG C for 3-5 hours, and firing. According to the invention, the regenerated refractory raw material chrome corundum solid solution is adopted as a raw material, the chrome corundum solid solution is generated in situ by using corundum and chromic oxide in the sintering process, hercynite fine powder is introduced into chrome corundum to partially replace Cr2O3, a multi-element solid solution (Al1-x-yCrxFey) 2O3 is generated in situ in the material, the content of Cr2O3 is reduced, the generation of Cr < 6 + > is inhibited, and sintering is promoted; the high-temperature use performance of the chrome corundum brick and the corrosion resistance of the sodium sulfate-containing salt slag are improved, the service life of a chemical salt-containing wastewater incinerator is prolonged, and meanwhile, the cyclic utilization of resources is realized.
本发明涉及一种化工含盐废水焚烧炉用复合铬刚玉砖及其制备方法，属于耐火材料领域。该复合铬刚玉砖由粒径≤3mm的再生耐火原料电熔铬刚玉、粒径≤3mm的电熔白刚玉、粒径≤8μm的氧化铬微粉、粒径≤31μm的铁铝尖晶石微粉、粒径≤4μm的氧化铝微粉为原料，外加结合剂压制为生坯于1500~1600℃高温炉中保温3‑5h烧制而成。本发明采用再生耐火原料铬刚玉固溶体为原料且利用烧成过程中刚玉和氧化铬原位生成铬刚玉固溶体，将铁铝尖晶石细粉引入铬钢玉中部分取代Cr2O3，在材料内部原位生成多元固溶体(Al1‑x‑yCrxFey)2O3，降低Cr2O3含量，抑制Cr6+生成，促进了烧结，提高了铬钢玉砖的高温使用性能和抗含硫酸钠盐渣的侵蚀性，提高了化工含盐废水焚烧炉的使用寿命，同时实现了资源的循环利用。
Composite chrome corundum brick for chemical salt-containing wastewater incinerator and preparation method of composite chrome corundum brick
The invention relates to a composite chrome corundum brick for a chemical salt-containing wastewater incinerator and a preparation method of the composite chrome corundum brick, and belongs to the field of refractory materials. The composite chrome corundum brick is prepared by the following steps: by taking regenerated refractory raw material electro-fused chrome corundum with the particle size of less than or equal to 3mm, electro-fused white corundum with the particle size of less than or equal to 3mm, chromic oxide micro powder with the particle size of less than or equal to 8 microns, hercynite micro powder with the particle size of less than or equal to 31 microns and aluminum oxide micro powder with the particle size of less than or equal to 4 microns as raw materials, adding a binding agent, pressing into a green body, preserving heat in a high-temperature furnace at 1500-1600 DEG C for 3-5 hours, and firing. According to the invention, the regenerated refractory raw material chrome corundum solid solution is adopted as a raw material, the chrome corundum solid solution is generated in situ by using corundum and chromic oxide in the sintering process, hercynite fine powder is introduced into chrome corundum to partially replace Cr2O3, a multi-element solid solution (Al1-x-yCrxFey) 2O3 is generated in situ in the material, the content of Cr2O3 is reduced, the generation of Cr < 6 + > is inhibited, and sintering is promoted; the high-temperature use performance of the chrome corundum brick and the corrosion resistance of the sodium sulfate-containing salt slag are improved, the service life of a chemical salt-containing wastewater incinerator is prolonged, and meanwhile, the cyclic utilization of resources is realized.
本发明涉及一种化工含盐废水焚烧炉用复合铬刚玉砖及其制备方法，属于耐火材料领域。该复合铬刚玉砖由粒径≤3mm的再生耐火原料电熔铬刚玉、粒径≤3mm的电熔白刚玉、粒径≤8μm的氧化铬微粉、粒径≤31μm的铁铝尖晶石微粉、粒径≤4μm的氧化铝微粉为原料，外加结合剂压制为生坯于1500~1600℃高温炉中保温3‑5h烧制而成。本发明采用再生耐火原料铬刚玉固溶体为原料且利用烧成过程中刚玉和氧化铬原位生成铬刚玉固溶体，将铁铝尖晶石细粉引入铬钢玉中部分取代Cr2O3，在材料内部原位生成多元固溶体(Al1‑x‑yCrxFey)2O3，降低Cr2O3含量，抑制Cr6+生成，促进了烧结，提高了铬钢玉砖的高温使用性能和抗含硫酸钠盐渣的侵蚀性，提高了化工含盐废水焚烧炉的使用寿命，同时实现了资源的循环利用。
Composite chrome corundum brick for chemical salt-containing wastewater incinerator and preparation method of composite chrome corundum brick
一种化工含盐废水焚烧炉用复合铬刚玉砖及其制备方法
LI SUPING (author) / ZHANG LIXIN (author) / XU ENXIA (author) / KANG XIN (author) / DENG JUNJIE (author) / FU QIQI (author) / LI TINGTING (author)
2023-08-04
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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