【摘要】：多晶硅廢渣是生產(chǎn)多晶硅過(guò)程中產(chǎn)生的固體廢棄物。目前國(guó)內(nèi)多晶硅廢渣主要以堆存和簡(jiǎn)易填埋的方式處理,不僅嚴(yán)重環(huán)境污染環(huán)境,而且占用了大量土地資源,同時(shí)也會(huì)加大企業(yè)運(yùn)營(yíng)成本。本文在蒸壓條件下通過(guò)堿激發(fā)原理,研究以多晶硅廢渣為主要原料制備新型墻體材料(MU10和MU25多晶硅廢渣蒸壓磚)的關(guān)鍵技術(shù)。這將對(duì)我國(guó)固體廢棄物的資源化利用、環(huán)境保護(hù)和新型墻體材料開發(fā)具有十分重要意義。本文系統(tǒng)研究了不同原材料摻量、成型工藝、消化時(shí)間和蒸壓工藝等關(guān)鍵參數(shù)對(duì)多晶硅廢渣蒸壓磚的力學(xué)性能作用規(guī)律；探索了多晶硅廢渣蒸壓磚強(qiáng)度產(chǎn)生的機(jī)理；測(cè)試和分析多晶硅廢渣蒸壓磚的耐久性能。研究結(jié)果表明：1.以多晶硅廢渣、石灰、砂子和水為原材料,經(jīng)過(guò)攪拌、消化、壓制成型、蒸壓等工藝制備了MU10多晶硅廢渣蒸壓磚,經(jīng)優(yōu)化的最佳配比為,多晶硅廢渣：石灰：河砂=40：10：50,水料比為15%,消化3h,成型壓力17MPa,蒸壓溫度為180℃,蒸壓時(shí)間為6h,可制得平均抗壓強(qiáng)度為11.5MPa的制品,滿足GB11945-1999《蒸壓灰砂磚》中MU10等級(jí)的各項(xiàng)力學(xué)指標(biāo)。2.為了提高力學(xué)強(qiáng)度,在MU10多晶硅廢渣蒸壓磚研究的基礎(chǔ)上,嘗試用粉煤灰作為活性增強(qiáng)相,系統(tǒng)研究了以多晶硅硅廢渣、粉煤灰、石灰和砂子為原材料,經(jīng)過(guò)輪碾攪拌、消化、壓制成型、蒸壓等工藝制備MU25多晶硅廢渣蒸壓磚的技術(shù),經(jīng)優(yōu)化的最佳配比為,多晶硅廢渣：粉煤灰：石灰：河砂=13：27：10：50,水料比為22.1%,消化時(shí)間為5h,成型壓力15MPa,蒸壓溫度為170℃,蒸壓時(shí)間為5h,可制得平均抗壓強(qiáng)度為27.8MPa的制品,滿足GB 11945-1999《蒸壓灰砂磚》中MU25等級(jí)的各項(xiàng)力學(xué)指標(biāo)。3.MU10多晶硅廢渣蒸壓磚平均密度為1450kg/m3,吸水率為27.3%,軟化系數(shù)為0.68,抗凍融性較差；MU25多晶硅廢渣蒸壓磚的平均密度為1700kg/m3,吸水率為22.5%,軟化系數(shù)為0.84,抗凍融性優(yōu)異;MU10和MU25多晶硅廢渣蒸壓磚,碳化后強(qiáng)度均有提高,均無(wú)石灰爆裂與泛霜現(xiàn)象。4.多晶硅廢渣中的單質(zhì)硅與Ca(OH)2在高溫高壓條件下能夠發(fā)生發(fā)應(yīng),生成納米纖維狀產(chǎn)物,其紅外特征吸收峰為981cm-1,推測(cè)為非晶態(tài)。5.MU25多晶硅廢渣蒸壓磚的水化產(chǎn)物主要為托勃莫來(lái)石、硬鈣硅石和鈣沸石。
[Abstract]:Polysilicon residue is a solid waste produced during the production of polysilicon. At present, the domestic polysilicon waste residue is mainly treated by storage and simple landfill. It not only seriously pollutes the environment, but also occupies a large amount of land resources, but also increases the operation cost of enterprises. Polysilicon residue is the key technology for the preparation of new wall materials (MU10 and MU25 polysilicon residue autoclave). This will be of great significance to the resource utilization, environmental protection and new wall material development of solid waste in China. This paper has systematically studied the content, molding process, digestion time and autoclave of different raw materials. Process and other key parameters on the mechanical properties of the polysilicon residue autoclaved brick; the mechanism of the strength of the polysilicon residue autoclaved brick was explored and the durability of the polysilicon residue autoclaved brick was tested and analyzed. The results showed that 1. with the polysilicon residue, lime, sand and water as raw materials, it was stirred, digested and pressed. MU10 polysilicon residue autoclave was prepared by the process of autoclave. The optimal optimum ratio is: polysilicon waste residue: Lime: river sand =40:10:50, water material ratio 15%, digestion 3h, molding pressure 17MPa, autoclave temperature 180, 6h, and the average compressive strength 11.5MPa products, satisfying GB11945-1999< autoclave sand brick > MU1 In order to improve the mechanical strength of the 0 grade.2., in order to improve the mechanical strength, on the basis of the research of MU10 polysilicon residue autoclave, the fly ash is used as the active phase. The polysilicon waste, the pulverized coal ash, the lime and the sand are used as the raw material to prepare the MU25 polysilicon waste by wheel milling, digestion, pressing molding and autoclaving. The best optimum ratio of slag autoclave is polysilicon waste: Fly Ash: Lime: Lime: river sand =13:27:10:50, water material ratio is 22.1%, digestion time is 5h, molding pressure 15MPa, autoclave temperature 170, and autoclave time 5h, the average compressive strength is 27.8MPa, satisfies GB 11945-1999< autoclaved sand brick > MU25. The average density of the.3.MU10 polysilicon residue autoclave is 1450kg/m3, the water absorption rate is 27.3%, the softening coefficient is 0.68, the freezing thawing resistance is poor, the average density of the MU25 polysilicon residue autoclave is 1700kg/m3, the water absorption rate is 22.5%, the softening coefficient is 0.84, the freezing thawing resistance is excellent, MU10 and MU25 polysilicon residue steamed brick, carbonization The post strength can be improved, no lime blowout and frosting phenomenon.4. polysilicon and Ca (OH) 2 can occur at high temperature and high pressure, which can produce nanofiber products and its infrared characteristic absorption peak is 981cm-1. It is speculated that the hydration products of non crystalline.5.MU25 polysilicon waste residue autoclave are mainly tobro mullite and hard calcium. Silica and calcium zeolite.
【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TU522.1

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