本文選題：氧化鎂微粉 + 有機(jī)助磨劑��； 參考：《武漢科技大學(xué)》2010年碩士論文

【摘要】： 機(jī)械粉碎法是一種傳統(tǒng)的粉體加工過程,具有成本低、產(chǎn)量高及制備工藝簡(jiǎn)單易行等特點(diǎn),廣泛用于制備和改性各種微粉體。然而同時(shí)其又具有效率低,能耗大的缺點(diǎn),生產(chǎn)中多作為其它制粉法的補(bǔ)充手段。因此提高粉磨效率、降低能耗,對(duì)機(jī)械粉碎法具有很重要的意義。MgO微粉作為耐火材料用微粉之一,具有耐火度高(2800℃)、抗侵蝕性優(yōu)良的特點(diǎn),其充當(dāng)結(jié)合劑不僅能夠提高材料強(qiáng)度,而且能夠減小耐火材料氣孔使其致密化,促進(jìn)燒結(jié),但因氧化鎂微粉容易團(tuán)聚和水化影響了其大范圍的使用。本文擬采用機(jī)械粉碎法制備氧化鎂微粉,在粉磨過程中通過添加自制有機(jī)助磨劑以提高球磨機(jī)粉磨效率,降低粉磨時(shí)間,以達(dá)到節(jié)能的目的；同時(shí)所添加的助磨劑通過對(duì)所得粉體表面改性起到改善其水化性能的效果,能夠有效的解決氧化鎂微粉制備和存放過程中的粘球、粘罐、團(tuán)聚和水化的問題。 基于Rehbinder的強(qiáng)度削弱理論、Mardulier的顆粒分散理論及氧化鎂微粉表面電性能,選擇合適表面活性劑并配置得到了實(shí)驗(yàn)所需助磨劑。為了研究帶有不同官能團(tuán)的表面活性劑對(duì)氧化鎂粉助磨作用的大小,分別配置了含有酰胺鍵、羥基、羧基和醚鍵的四種助磨劑。通過對(duì)所得粉體激光粒度分析結(jié)果知,高能球磨法制備氧化鎂微粉過程中,所添加助磨劑通過在顆粒裂紋及新生表面吸附改變顆粒間作用力,能夠起到有效的助磨作用,提高了粉磨效率,但因配方中所含官能團(tuán)的不同,其助磨作用的大小也略有不同；在水平方向做行星轉(zhuǎn)動(dòng)的行星球磨機(jī)與依靠球磨罐的上下振動(dòng)粉磨的振動(dòng)磨相比,行星磨所得粉體更加容易結(jié)塊于球磨罐底部,不利于長(zhǎng)時(shí)間的粉磨,而振動(dòng)磨則可以通過更大范圍的調(diào)節(jié)球料比來得到更細(xì)粒度的粉體,降低粉磨時(shí)間。 通過對(duì)氧化鎂微粉水化性能測(cè)試結(jié)果分析知,所添加助磨劑中的改性劑疏水基鏈段通過在球磨罐中不斷的攪拌和翻轉(zhuǎn),能夠有效的吸附于氧化鎂微粉表面使其抗水化性能得到提高。但是當(dāng)其添加量過大時(shí),游離的疏水基鏈段將與已吸附在固體表面上的表面活性劑疏水基鏈相互作用,使得粉體表面呈現(xiàn)親水性,從而使粉體抗水化性能降低。通過對(duì)氧化鎂微粉Zeta電位結(jié)果進(jìn)行分析發(fā)現(xiàn),(NaPO3)6與改性后氧化鎂在溶液中ζ絕對(duì)值為30mV,而添加Na5P3O10為20.62 mV,添加FS僅為9.64 mV。因此,使用本文所制氧化鎂微粉作為耐火材料澆注料結(jié)合劑使用時(shí),最佳分散劑為(NaPO3)6,其次為Na5P3O10,而FS20則不宜作為分散劑與改性后氧化鎂共同使用。 為進(jìn)一步研究MgO微粉在澆注料中使用性能,將制備得到氧化鎂微粉與SiO2微粉混合(質(zhì)量比4：1)作為鎂質(zhì)結(jié)合劑用于鎂質(zhì)澆注料中,與SiO2微粉結(jié)合的鎂質(zhì)澆注料性能進(jìn)行對(duì)比。由實(shí)驗(yàn)結(jié)果知,鎂質(zhì)結(jié)合劑由于含二氧化硅的量較少,在低溫條件下產(chǎn)生較少M(fèi)gO-SiO2-H2O超細(xì)粉凝聚結(jié)合,在高溫條件下,由于含有更多的氧化鎂微粉促進(jìn)燒結(jié),因此鎂質(zhì)結(jié)合劑結(jié)合鎂澆注料的中溫、高溫強(qiáng)度較SiO2微粉結(jié)合鎂質(zhì)澆注料大。
[Abstract]:Mechanical pulverization is a traditional process of powder processing with low cost, high production and easy preparation. It is widely used in the preparation and modification of various micropowders. However, it has the disadvantages of low efficiency and high energy consumption. It is used as a supplementary means of other pulverizing methods in production. Therefore, the efficiency of grinding and energy consumption are reduced. Mechanical pulverization is of great significance to.MgO powder as one of the micro powder used in refractories. It has high refractoriness (2800 C) and excellent corrosion resistance. It can not only improve the strength of the material, but also reduce the porosity of the refractory material and promote the sintering, but it is easy to be reunited and hydrated by the Magnesium Oxide micro powder. Magnesium Oxide micro powder was prepared by mechanical pulverization. In the process of grinding, a self-made organic grinding aid was added to improve the grinding efficiency of the ball mill and reduce the grinding time to achieve the purpose of saving energy. At the same time, the added grinding agent improved its hydration performance through the surface modification of the obtained powder. The effect can effectively solve the problem of sticking, sticking, reassembling and hydration of Magnesium Oxide powder in the process of preparation and storage.
Based on the strength weakening theory of Rehbinder, the particle dispersion theory of Mardulier and the surface electrical properties of Magnesium Oxide micro powder, the suitable surfactants were selected and the required grinding agents were obtained. In order to study the effect of the surfactant with different functional groups on the grinding effect of magnesia powder, the amide bonds, hydroxyl groups and carboxyl were arranged respectively. Four kinds of grinding aids with base and ether bonds. Through the results of particle size analysis of the powders obtained, it is known that in the preparation of Magnesium Oxide micropowder by high energy ball milling, the added grinding agent can improve the grinding efficiency by changing the intergranular force on the particle crack and the new surface, and improves the grinding efficiency, but the functional group contains the functional group. The size of the grinding aid is slightly different, and the planetary ball mill in the horizontal direction is more likely to be more easily caked at the bottom of the ball mill than by the vibratory mill that depends on the upper and lower vibrational grinding of the ball mill, which is not conducive to long grinding, while the vibratory mill can be used to regulate the ball in a larger range. It is better to get finer grained powder and lower grinding time.
Through the analysis of the test results of the Hydration Performance of Magnesium Oxide micro powder, it is found that the hydrophobic group of the modifier in the added grinding agent can be effectively adsorbed on the surface of Magnesium Oxide powder to improve its hydration resistance by stirring and turning over the ball mill, but when the addition amount is too large, the free hydrophobic chain segment will be absorbed. The hydrophobicity of the surface active agent attached to the surface of the solid makes the surface of the powder present hydrophilicity, thus reducing the hydration resistance of the powder. Through the analysis of the Zeta potential results of Magnesium Oxide micropowder, the absolute value of the zeta of (NaPO3) 6 and the modified Magnesium Oxide in the solution is 30mV, and the addition of Na5P3O10 is 20.62 mV, and the addition of FS is only 9.. 64 mV., therefore, the best dispersant is (NaPO3) 6, followed by Na5P3O10 when using the Magnesium Oxide micro powder as the binder of refractory castable, while FS20 should not be used as a dispersant and the modified Magnesium Oxide.
In order to further study the performance of MgO micro powder in castable, the properties of magnesia castable which is combined with SiO2 powder in magnesia castable by mixing Magnesium Oxide micro powder and SiO2 powder (mass ratio 4:1) as magnesia binder for magnesia castable are compared. It is known from the experimental results that the magnesia binder is low at low temperature because of the amount of silica containing less. Under the conditions, less MgO-SiO2-H2O ultrafine powder condensation is produced. Under the high temperature conditions, more Magnesium Oxide micro powder is used to promote sintering. Therefore, the magnesia binder combined with magnesium castable is higher at middle temperature and higher at high temperature than that of SiO2 powder.

【學(xué)位授予單位】：武漢科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2010
【分類號(hào)】：TB383.3

【引證文獻(xiàn)】

相關(guān)期刊論文 前1條

1 顧華志;張文杰;;不定形耐火材料節(jié)能化研究進(jìn)展[J];耐火材料;2012年03期

相關(guān)會(huì)議論文 前1條

1 顧華志;張文杰;;不定形耐火材料節(jié)能化研究進(jìn)展[A];2011全國(guó)不定形耐火材料學(xué)術(shù)會(huì)議論文集[C];2011年

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本文編號(hào)：1895693