本文選題：還原料 + 還原度��； 參考：《廣西大學(xué)》2013年碩士論文

【摘要】：本課題主要針對(duì)水泥生產(chǎn)企業(yè)常出現(xiàn)的還原料進(jìn)行探討研究,主要研究還原料與正常氧化料之間的差異性,并提出用以表征水泥熟料還原程度的還原度H。利用過(guò)渡金屬離子-配位體結(jié)構(gòu)在光的激發(fā)下,發(fā)生電子躍遷而產(chǎn)生紫外吸收特性的原理來(lái)分析水泥熟料中的鐵相鹽時(shí)發(fā)現(xiàn)：由于三價(jià)鐵鹽具備紫外吸收特性而使熟料在入=1437nm處產(chǎn)生吸收峰,由于還原氣氛的存在,使得熟料體系Fe3+降低,從而使得還原料的紫外吸收度低于氧化料,這也就是氧化還原料在紫外光譜中的主要差異性。 通過(guò)化學(xué)分析純合成熟料礦物(硅酸鹽、鋁酸鹽和鐵酸鹽),測(cè)定其紫外吸收光譜發(fā)現(xiàn)：這三者之間只有鐵酸鹽具備紫外吸收特性而產(chǎn)生吸收峰,這就表明水泥熟料引起紫外吸收主要是由于鐵相鹽引起。同時(shí),不同冷卻制度的鐵相鹽都能產(chǎn)生紫外吸收,且兩者之間的吸收相差不大。 在水泥熟料體系中,熟料紫外吸收度隨體系Fe3+含量遞增而增加,兩者符合冪函數(shù)關(guān)系,相關(guān)系數(shù)達(dá)0.96。同時(shí),具備類似鐵相鹽結(jié)構(gòu)的Mn4+也能引起紫外吸收特性,使得水泥熟料產(chǎn)生吸收峰,從而表明具備“變價(jià)金屬-配位體“結(jié)構(gòu)是水泥熟料產(chǎn)生紫外吸收的主要原因。 通過(guò)對(duì)還原料進(jìn)行不同溫度的氧化處理時(shí)發(fā)現(xiàn)：在相同時(shí)間下,熟料紫外吸收度隨氧化溫度的提高而增加,但在1200-1300℃區(qū)間內(nèi),紫外吸收度幾乎無(wú)變化,而且在1300℃下延長(zhǎng)煅燒時(shí)間至60min也并不能增加熟料吸收度。同時(shí),在對(duì)1200℃和1300℃下煅燒不同時(shí)間研究中,1300℃下煅燒5min熟料紫外吸收度已無(wú)明顯增加,而1200℃下煅燒11min熟料紫外吸收度依然增加。 利用紫外光譜對(duì)水泥熟料中的鐵相鹽進(jìn)行定量分析表明,熟料鐵相鹽含量正比于紫外吸收度,二者相關(guān)吸收R2=0.970,這為我們利用紫外吸收光譜對(duì)水泥熟料中的鐵相鹽進(jìn)行研究提供了直接的依據(jù)。通過(guò)對(duì)熟料鐵相鹽紫外吸收特性的研究及還原料的氧化處理后,我們提出還原料還原度的評(píng)價(jià)標(biāo)準(zhǔn)及定義。標(biāo)準(zhǔn)：將經(jīng)過(guò)1300℃下煅燒30min的還原料粉磨至全部通過(guò)80μm方孔篩,稱取試樣1.0g,在20MPa下壓制成型,測(cè)定熟料紫外吸收度。定義熟料還原度H等于還原料氧化前后的吸收度差值A(chǔ)A除以氧化后熟料的吸收度。
[Abstract]:This paper mainly focuses on the research of returning raw materials which often appear in cement manufacturing enterprises, mainly studies the difference between returning raw materials and normal oxidizing materials, and puts forward the reduction degree of cement clinker which is used to characterize the degree of reduction of cement clinker. Using the transition metal ion-ligand structure under the excitation of light, When analyzing iron phase salt in cement clinker, it is found that due to the ultraviolet absorption characteristic of trivalent iron salt, the absorption peak of clinker is produced at 1437 nm due to the existence of reducing atmosphere. The Fe3 of the clinker system is reduced, and the UV absorption of the raw material is lower than that of the oxidized material, which is the main difference of the redox material in the UV spectrum. The UV absorption spectra of pure synthetic clinker minerals (silicate, aluminate and ferrate) were determined by chemical analysis. This indicates that the ultraviolet absorption of cement clinker is mainly caused by iron phase salt. At the same time, the iron phase salts of different cooling systems can produce ultraviolet absorption, and the absorption between them is not different. In cement clinker system, the UV absorption of clinker increases with the increase of Fe3 content, and the correlation coefficient is 0.96. At the same time, Mn4 with the structure similar to iron phase salt can also cause ultraviolet absorption characteristics, which makes cement clinker have absorption peak, which indicates that the structure of "variable value metal-ligand" is the main reason for ultraviolet absorption of cement clinker. When the raw materials were oxidized at different temperatures, it was found that the UV absorbance of clinker increased with the increase of oxidation temperature at the same time, but the UV absorption of clinker hardly changed in the range of 1200-1300 鈩，

本文編號(hào)：1882707