Thaum cov nitrogen cov ntsiab lus nyob rau hauv interificial graphite lossis roj av cuam tshuam rau cov khoom siv, nws yuav cuam tshuam ntau dhau, nws yuav cuam tshuam ntau dua, thiab cov ncauj lus hauv qab no:
Cuam Tshwm Rau Cov Khoom Siv Khoom
Firstly, conductivity thiab thermal ruaj khov yog txo. Nitrogen doping tuaj yeem cuam tshuam cov qauv kev ua qauv ntawm cov qauv ntawm cov nyom ntawm graphite, nce tiv taus. Yog tias tsis muaj peev xwm ntawm cov duab cuav nce los ntawm 10% mus rau 30%, nws yuav cuam tshuam ob qho hluav taws xob thiab thermal ua haujlwm. Thaum lub sij hawm high-kub metallurgy, nitrogen-muaj cov tebchaw muaj feem cuam tshuam oxidative decomposition, nrawm cov ntaub ntawv poob.
Cov kev tsis zoo ntawm cov ntawv thov nqes qis
Thaum siv los ua tus neeg sawv cev carburizing hauv kev sib tw, nitrogen yuav yaj mus rau hauv cov hlau tsis zoo thiab ua rau muaj cov khoom siv loj heev xws li cov ntaub pua tsev muaj zog thiab cov ntawv loj. Hauv txhuas electrolysis, yog tias graphite anode muaj ntau cov nitrogen ntau dhau, nws tso pa roj av, paug cov pa roj hmab txhuas thiab txo cov purity ntawm aluminium. Cov ntsiab lus nitrogen hauv aluminium tshaj 50 ppm yuav ua rau muaj teeb meem zoo. Hauv kev lag luam thiab kev lag luam refractory tuaj yeem hnov mob nrog oxygen ntawm cov pa roj kub kom muaj cov pa roj teeb zoo li nox, nce ib puag ncig cov nqi kho mob. Hauv cov ntawv thov xws li graphite crucibles thiab refractory cib, nitrogen impurities yuav txo cov khoom siv tau tawm tsam thiab kub lub zog.
Cov teeb meem hauv cov txheej txheem ntau lawm
Graphitization efficiency decreases as nitrogen may inhibit the orderly arrangement of carbon atoms during the graphitization process, prolonging the process time. The graphitization temperature needs to be increased by 50-100℃ to compensate for nitrogen interference, increasing energy consumption, with electricity consumption rising by 5%-15% and carbon emissions. If the raw petroleum coke itself has a high nitrogen content (e.g., >{{0 {0}} Yog tias nitrogen yog siv los ua kev tiv thaiv kev tiv thaiv, cov txheej txheem tsis yuav tsum tau tswj hwm ntawm infiltrating cov ntaub ntawv, yog li nce qhov nyuaj ntawm raw khoom thiab kev tswj cov txheej txheem.
Kev daws teeb meem thiab cov qauv kev lag luam
Yog li ntawd, nyob rau hauv raw cov ntaub ntawv xaiv thiab pretreatment, tsawg-nitrogen roj av coke yuav tsum tau xaiv, nrog cov roj av zoo ntawm cov ntsiab lus nitrogen ntawm<0.3% or volatile nitrogen-containing compounds should be decomposed through calcination at temperatures above 1300℃. Additionally, acid washing of the raw materials can remove some nitrogen impurities. Process optimization can also be conducted, such as controlling the atmosphere in the graphitization furnace: replacing nitrogen with argon protection in the later stages of graphitization to reduce nitrogen doping; Adjusting the heating curve, extending the holding time at critical temperatures of 2000-2500℃ to promote the escape of nitrogen elements.
