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bold;">石墨</span>提純?yōu)楦呒兪姆椒ê芏啵?jīng)過化學方法提純主要有4種途徑：<br> 1、氯化焙燒法。氯化焙燒法低的焙燒溫度和較小的氯氣消耗量使石墨的出產(chǎn)本錢有較大的降低，一起石墨產(chǎn)品的含碳量與用氫氟酸法處理后的恰當，相比之下氯化焙燒法的回收率較高。但因氯氣有毒，腐蝕性強，對設(shè)備操作要求較高，需求嚴峻密封，對尾氣有必要妥善處理，所以在必定程度上約束了其推行運用。<br> 2、堿酸提純法。堿酸法提純后的<span style="font-weight: bold;">石墨</span>含碳量可達99%以上，具有一次性出資少、產(chǎn)品層次較高、工藝適應性強等特征。而且還具有設(shè)備慣例、通用性強（除石墨外，許多非金屬礦的提純都可以選用堿酸法）等利益，堿酸法是現(xiàn)在在我國運用最廣泛的方法；其缺陷則是能量消耗大、反應時間長、<span style="font-weight: bold;">石墨</span>丟掉量大以及廢水污染嚴峻。<br> 3、氫氟酸法。氫氟酸法最主要的利益是除雜效率高，所得產(chǎn)品的層次高、對石墨產(chǎn)品的功用影響小、能耗低。缺陷是氟氫酸有劇毒和強腐蝕性，出產(chǎn)進程中有必要有嚴峻的安全防護方法，關(guān)于設(shè)備的嚴峻要求也導致本錢的升高，其他氫氟酸法產(chǎn)生的廢水毒性和腐蝕性都很強，需求嚴峻處理后才調(diào)排放，環(huán)保投入也使氫氟酸法本錢低的利益大打折扣。<br> 4、高溫法的最大利益是產(chǎn)品的含碳量極高，可達99。995%以上，缺陷是須專門規(guī)劃建造高溫爐，設(shè)備貴重，一次性出資多，其他，能耗大，高額的電費增加了出產(chǎn)本錢。而且嚴苛的出產(chǎn)條件也使這種方法的運用范圍極為有限，只要國防、航天等對石墨產(chǎn)品純度有特殊要求的場合才考慮選用該方法進行石墨的小批量出產(chǎn)，工業(yè)上還無法結(jié)束推行。<br></p>  </div> <div id="dzrzftz" class="navs clearfix"> <div id="dzrzftz" class="pre"> <span>上一篇：</span> <a 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