本文選題：高鎂石灰石原料　切入點(diǎn)：XDL系統(tǒng)　出處：《西安建筑科技大學(xué)》2015年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：水泥工業(yè)一直是我國(guó)經(jīng)濟(jì)發(fā)展中不可缺少的重要角色,并且隨著水泥工業(yè)的發(fā)展,高品質(zhì)石灰石資源已日趨緊缺,高鎂質(zhì)石灰石因?yàn)檠趸V含量高,影響水泥后期安定性的原因而得不到有效利用,資源危機(jī)越來(lái)越嚴(yán)重。如何充分有效的利用高鎂質(zhì)石灰石資源已成為水泥行業(yè)發(fā)展中亟需解決的難題。因此,通過(guò)對(duì)NSP和XDL煅燒工藝的現(xiàn)場(chǎng)調(diào)研和分析,以及對(duì)NSP和XDL煅燒工藝煅燒所得水泥熟料作系統(tǒng)的對(duì)比研究,找出兩種煅燒工藝煅燒所得熟料的差異性,揭示XDL工藝處理高鎂原料燒制高性能水泥熟料的原因,旨在探索出一條適合高鎂質(zhì)石灰石資源在水泥行業(yè)有效利用的方法,其研究結(jié)果表明:(1)XDL煅燒工藝更有利于MgO在熟料中的固溶,從而減少熟料中方鎂石含量,且熟料質(zhì)量穩(wěn)定。說(shuō)明XDL煅燒系統(tǒng)能更好的適應(yīng)高鎂原料,更有利于高鎂原料的煅燒。(2)與NSP系統(tǒng)相比較,采用XDL系統(tǒng)煅燒高鎂石灰石原料可以將更多的MgO固溶在熟料中,減少熟料中方鎂石含量,有利于水泥后期的安定性;XDL系統(tǒng)煅燒所得熟料中方鎂石含量少,方鎂石平均尺寸不足1.0μm,且熟料中各礦物相與液相量分布均勻,A礦晶粒形狀規(guī)則,尺寸平均值為30μm;NSP系統(tǒng)煅燒所得熟料中的A礦以M3型為主,多為細(xì)小晶體,XDL系統(tǒng)煅燒高鎂石灰石原料能夠?qū)⑹炝现蠥礦更多的穩(wěn)定為M1型;相比NSP系統(tǒng),XDL系統(tǒng)煅燒高鎂石灰石原料所得熟料后期強(qiáng)度增長(zhǎng)迅速,其3~28d強(qiáng)度增幅比NSP系統(tǒng)煅燒的熟料高出7.61MPa。(3)XDL工藝系統(tǒng)具有固硫作用,適當(dāng)?shù)腟O3能夠有效減少高鎂熟料中方鎂石含量,有利于高鎂熟料中氧化鎂的固溶,促進(jìn)C3S晶粒尺寸的增大,并且能夠?qū)⑹炝现蠧3S更多的穩(wěn)定為M1型,提高熟料的力學(xué)性能。
[Abstract]:Cement industry has always been an indispensable role in the economic development of our country, and with the development of cement industry, high quality limestone resources have become increasingly scarce, high magnesia limestone because of the high content of magnesium oxide, The reasons that affect the stability of cement in the later period can not be used effectively, and the resource crisis is becoming more and more serious. How to make full and effective use of high magnesium limestone resources has become a difficult problem in the development of cement industry. Based on the field investigation and analysis of NSP and XDL calcination process, as well as the systematic comparative study on the cement clinker calcined by NSP and XDL calcination process, the differences of clinker between the two calcination processes are found out. In order to find a suitable method for the efficient utilization of high magnesium limestone resources in cement industry, this paper reveals the reason why high magnesium raw material is fired into high performance cement clinker by XDL process, in order to find out a suitable method for the utilization of high magnesium limestone resources in cement industry. The results show that the MgO calcination process is more favorable to the solid solution of MgO in clinker, thus reducing the content of periclase in clinker and the quality of clinker is stable. It shows that the XDL calcination system can better adapt to high magnesium raw material. Compared with NSP system, calcining high magnesium limestone with XDL system can dissolve more MgO in clinker and reduce the content of periclase in clinker. The clinker calcined by XDL system in favor of the later stage of cement has less periclase content, less than 1.0 渭 m average size of periclase, and the distribution of mineral phase and liquid phase in clinker is uniform and the grain shape of ore A is regular. The average size is 30 渭 m NSP system calcined clinker A ore is mainly M3 type, most of which are fine crystal XDL system calcined high magnesium limestone raw materials can stabilize the clinker A ore to M1 type. Compared with the clinker from calcined high magnesium limestone by NSP system, the strength of clinker increased rapidly in 328d, and the increase of clinker strength was 7.61MPa.f3XDL higher than that of clinker calcined by NSP system. Proper SO3 can effectively reduce the content of periclase in high magnesium clinker, which is beneficial to the solid solution of magnesium oxide in high magnesium clinker, promote the increase of grain size of C3s, and can stabilize more C3S in clinker to M1 type, so as to improve the mechanical properties of clinker.
【學(xué)位授予單位】：西安建筑科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TQ172.6

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