本文選題：轉(zhuǎn)爐鋼渣 + 鋼渣組成　； 參考：《安徽工業(yè)大學(xué)》2015年碩士論文

【摘要】：鋼渣微粉化是目前實(shí)現(xiàn)鋼渣綜合利用的有效途徑之一,但是常見鋼渣,如轉(zhuǎn)爐鋼渣、不銹鋼電爐渣等難磨、難粉化,是鋼渣微粉化的重要制約因素。要實(shí)現(xiàn)鋼渣高效利用,對(duì)鋼渣粉化方式和影響條件的研究是十分必要的。常見鋼渣的主要礦相為硅酸三鈣(即C_3S),硅酸二鈣(即C_2S),鐵鋁酸鈣(即Ca2(Al,Fe)2O5)及鎂鐵相固溶體(即MgO2Fe0)等。其中C_2S在725℃時(shí)會(huì)發(fā)生β-C_2S向γ-C_2S的晶型轉(zhuǎn)變,這個(gè)過程伴隨著約11%的體積膨脹,產(chǎn)生的強(qiáng)烈內(nèi)應(yīng)力可使C_2S粉化。若鋼渣中大量發(fā)生此類晶型轉(zhuǎn)變將能實(shí)現(xiàn)鋼渣的自粉化,這是一種簡單、低耗、有效的鋼渣粉化方式。本論文在前期鋼渣自粉化實(shí)驗(yàn)的基礎(chǔ)上,利用XRD全譜擬合精修方法,結(jié)合Factsage熱力學(xué)相平衡計(jì)算,研究了實(shí)際鋼渣中含有的Cr、P等元素對(duì)β-C_2S向7-C_2S晶型轉(zhuǎn)變的影響,具體分析了Cr、P含量變化對(duì)p-C_2S向y-C_2S的晶型轉(zhuǎn)變率以及鋼渣自粉化的影響,確定了鋼渣實(shí)現(xiàn)自粉化時(shí)渣中Cr、P的含量限制范圍,為鋼渣自粉化提供了理論依據(jù)和渣成分條件,對(duì)提高鋼渣易磨性、實(shí)現(xiàn)鋼渣綜合利用有積極的現(xiàn)實(shí)意義。本論文的研究結(jié)果表明：(1)對(duì)于純C_2S的自粉化實(shí)驗(yàn),當(dāng)Cr_2O_3含量為0.5%時(shí),高溫冷卻后,C_2S中p-C_2S占比盡管達(dá)到68.8%,但C_2S仍能發(fā)生自粉化,p-C_2S向γγ-C_2S的晶型轉(zhuǎn)變產(chǎn)生的自粉化效應(yīng)顯著；當(dāng)純C_2S中Cr_2O_3含量為1%時(shí),冷卻后,C_2S中晶型轉(zhuǎn)變得到的γ-C_2S占比已小于18.4%,C_2S不會(huì)出現(xiàn)粉化現(xiàn)象,此含量Cr_2O_3的摻入抑制了p-C_2S的晶型轉(zhuǎn)變,影響C_2S的自粉化。當(dāng)純C_2S摻入P_2O_5時(shí),若P_2O_5的含量小于1%,則對(duì)β-C_2S晶型轉(zhuǎn)變的影響并不明顯,高溫冷卻后,C_2S仍有自粉化；當(dāng)P_2O_5的含量達(dá)到1.25%時(shí),冷卻后C_2S中有a'H-C_2S出現(xiàn),而生成的γ-C_2S占比小于20.6%,試樣也不再出現(xiàn)自粉化。熱力學(xué)分析表明,純C_2S中摻入Cr_2O_3或P_2O_5能促進(jìn)C_2S中液相的生成,使Cr3+、P5+外摻離子向C_2S中的固溶,從而影響β-C_2S向γ-C_2S的晶型轉(zhuǎn)變,減弱了C_2S的自粉化效果。純C_2S摻雜Cr_2O_3或P_2O_5的自粉化實(shí)驗(yàn)結(jié)果也表明,當(dāng)C_2S中Cr_2O_3含量大于1%或P_2O_5含量大于1.25%時(shí),高溫冷卻后,C_2S中γ-C_2S占比均小于20.6%,此時(shí)β-C_2S向γ-C_2S晶型轉(zhuǎn)變不充分,體積膨脹效應(yīng)導(dǎo)致的自粉化內(nèi)應(yīng)力不足,C_2S將不會(huì)出現(xiàn)自粉化現(xiàn)象。(2)對(duì)于轉(zhuǎn)爐鋼渣的自粉化實(shí)驗(yàn),采用了CaO 45%-SiO2 18%-MgO 10% Fe2O3 27%的四元合成轉(zhuǎn)爐渣,分別計(jì)算了渣中C_2S的生成量,分析了不同含量Cr_2O_3或P20s摻入時(shí)轉(zhuǎn)爐鋼渣的自粉化效果。當(dāng)鋼渣中摻入Cr_2O_3時(shí),少量Cr_2O_3對(duì)渣中p-C_2S晶型轉(zhuǎn)變的影響較小。當(dāng)渣中Cr_2O_3含量在0.25%-2%范圍內(nèi)時(shí),其影響p-C_2S晶型轉(zhuǎn)變的能力并沒有隨著摻量的增加發(fā)生明顯的變化,轉(zhuǎn)爐鋼渣仍呈現(xiàn)出完全自粉化的狀態(tài)：當(dāng)Cr_2O_3含量達(dá)到3%時(shí),其影響p-C_2S晶型轉(zhuǎn)變的能力明顯增加,渣中生成γ-C_2S占C_2S生成總量小于35.7%,鋼渣沒有出現(xiàn)自粉化。當(dāng)鋼渣中摻入P_2O_5時(shí),若P_2O_5含量為0.25%,則鋼渣仍能完全自粉化；當(dāng)P_2O_5含量為0.5%時(shí),轉(zhuǎn)爐鋼渣中β-C_2S晶型轉(zhuǎn)變受到抑制,生成γ-C_2S的占比小于35.3%,鋼渣沒有出現(xiàn)自粉化現(xiàn)象；隨著P20s含量的進(jìn)一步增加,渣中生成γ-C_2S的占比進(jìn)一步降低,鋼渣均不再自粉化。并且當(dāng)轉(zhuǎn)爐鋼渣中P_2O_5含量達(dá)到1.5%時(shí),渣中開始有α'H-C_2S出現(xiàn)。上述結(jié)果表明,要實(shí)現(xiàn)轉(zhuǎn)爐鋼渣的自粉化,則渣中Cr_2O_3含量必須低于3%,或渣中P20s含量必須低于0.5%,此時(shí)轉(zhuǎn)爐鋼渣內(nèi)γ-C_2S占C_2S生成總量均小于35.3%,才能達(dá)到鋼渣自粉化的效果。特別是對(duì)實(shí)際轉(zhuǎn)爐鋼渣中P含量要嚴(yán)格控制,渣中過高P含量將會(huì)抑制鋼渣的自粉化,達(dá)不到提高鋼渣易磨性的效果。
[Abstract]:The micro powder of steel slag is one of the effective ways to realize the comprehensive utilization of steel slag at present. But the common steel slag, such as the slag of converter steel, the slag of stainless steel electric furnace and so on, is an important restriction factor for the micro powder of steel slag. It is necessary to study the method of slag powder and the influence conditions for the high efficiency utilization of steel slag. The phase is three calcium silicate (C_3S), calcium silicate two (that is, C_2S), calcium ferric aluminate (Ca2 (Al, Fe) 2O5) and magnesium iron phase solid solution (MgO2Fe0). In which C_2S is at 725 degrees C, the crystalline transformation of beta -C_2S to gamma -C_2S will occur. This process is accompanied by a volume expansion of about 11%, and the strong internal stress can make C_2S powder. If a large number of such crystals occur in steel slag, a large number of such crystals occur. This paper is a simple, low consumption and effective method for slag pulverization of steel slag, which is a simple, low consumption and effective method for slag pulverization. In this paper, on the basis of the experiment of self powdering of steel slag, this paper studied the transformation of Cr, P and other elements containing Cr, P and other elements in the actual steel slag to the 7-C_2S crystal form in the actual steel slag on the basis of the experiment of the self powdering of steel slag. The influence of the change of Cr and P content on the transformation rate of p-C_2S to y-C_2S and the self powdering of steel slag is analyzed. The limit range of Cr and P content in slag is determined, which provides the theoretical basis and slag composition conditions for the self powdering of steel slag. It has a positive realistic meaning for improving the grinding property of steel slag and realizing the comprehensive utilization of steel slag. The research results of this thesis show that: (1) for pure C_2S, when the content of Cr_2O_3 is 0.5%, the p-C_2S occupation ratio in C_2S is 68.8%, but the C_2S can still be self powdering, and the effect of p-C_2S to the crystal form of gamma ray -C_2S is obvious. When the Cr_2O_3 content is 1% in the pure C_2S, the cooling, C_2S The ratio of gamma -C_2S to crystal transformation is less than 18.4%, and C_2S will not be powderizing. The addition of Cr_2O_3 inhibits the crystal transformation of p-C_2S and affects the self pulverization of C_2S. When pure C_2S is added to P_2O_5, if P_2O_5 content is less than 1%, the effect on the transformation of the crystal form is not obvious, and C_2S is still self powdering after high temperature cooling; when P is in the P P_2O_5 When the content of _2O_5 reaches 1.25%, a'H-C_2S appears in C_2S after cooling, and the ratio of the generated gamma -C_2S is less than 20.6%, and the sample is no longer in powder. The thermodynamic analysis shows that the addition of Cr_2O_3 or P_2O_5 in pure C_2S can promote the formation of the liquid phase in C_2S, and make the Cr3+ and P5+ doped ions to the solid solution in C_2S, thus affecting the crystal form of the beta -C_2S. The self powdering effect of C_2S is weakened. The results of self powdering of pure C_2S doped Cr_2O_3 or P_2O_5 also show that when Cr_2O_3 content in C_2S is greater than 1% or P_2O_5 content is greater than 1.25%, the proportion of gamma -C_2S in C_2S is less than 20.6% after high temperature cooling, and at this time, the transformation of beta -C_2S to gamma -C_2S crystal is not sufficient and the volume expansion effect is in the self powdering. When the stress is insufficient, C_2S will not be self powderizing. (2) for the self powdering experiment of converter steel slag, four meta converter slag of CaO 45%-SiO2 18%-MgO 10% Fe2O3 27% is used to calculate the formation of C_2S in the slag, and the self powdering effect of the steel slag with different content of Cr_2O_3 or P20s is analyzed. When the slag is added to the slag, the slag is added to the slag. A small amount of Cr_2O_3 has little effect on the transformation of p-C_2S crystal in the slag. When the content of Cr_2O_3 in the slag is within the range of 0.25%-2%, the ability to influence the transformation of p-C_2S crystal is not obviously changed with the increase of content. The converter steel slag still presents a state of complete self pulverization. When the content of Cr_2O_3 reaches 3%, it affects the transition of the p-C_2S crystal. The capacity of the slag is obviously increased, the production of gamma -C_2S in the slag is less than 35.7%, and the slag of steel is less than 35.7%. The slag has no self powdering. When the content of P_2O_5 is 0.25%, the slag can be completely self powdered when the content of P_2O_5 is 0.25%. When the content of P_2O_5 is 0.5%, the transformation of the beta -C_2S crystal form in the converter steel slag is suppressed, the ratio of the generated gamma -C_2S is less than 35.3%, and the slag is no more than the slag. With the further increase of the P20s content, the proportion of gamma -C_2S in slag is further reduced and the slag is no longer self powdering. And when the P_2O_5 content of the converter slag reaches 1.5%, the slag begins to appear in the slag. The results show that the Cr_2O_3 content in the slag must be lower than that of the slag in the slag. 3%, the content of P20s in the slag must be less than 0.5%. At this time, the total amount of gamma -C_2S in the slag of converter steel slag is less than 35.3%, in order to achieve the effect of slag self pulverization. Especially, the P content in the slag of the actual converter steel slag should be strictly controlled. The high P content in the slag will inhibit the self pulverization of steel slag, and the effect of improving the grinding property of steel slag can not be achieved.
【學(xué)位授予單位】：安徽工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：X757

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