典型重金屬離子對(duì)堿礦渣水泥水化及結(jié)構(gòu)形成的影響
發(fā)布時(shí)間：2018-08-22 17:24
【摘要】：隨著我國(guó)經(jīng)濟(jì)的迅猛發(fā)展,環(huán)境污染問題日漸嚴(yán)重,給社會(huì)帶來(lái)了很大壓力,重金屬?gòu)U棄物的處置也越來(lái)越受到重視。目前水泥固化法是處理重金屬?gòu)U棄物的重要方法之一。傳統(tǒng)硅酸鹽水泥基材料固化重金屬?gòu)U棄物存在固化體增容比大、重金屬浸出濃度高、耐久性欠佳、抗酸和抗硫酸鹽性能差等明顯的缺陷。堿礦渣水泥的水化產(chǎn)物主要是低鈣硅比的C-S-H凝膠,能更有效固封有毒重金屬離子,是一種環(huán)境效益和經(jīng)濟(jì)效益顯著的新型低碳型膠凝材料。研究重金屬離子對(duì)堿礦渣水泥水化及結(jié)構(gòu)形成的影響,為深入認(rèn)識(shí)堿礦渣水泥石固結(jié)重金屬離子的機(jī)理提供技術(shù)基礎(chǔ),對(duì)促進(jìn)其應(yīng)用具有重要社會(huì)意義。本文采用水膠比0.3,堿當(dāng)量5%(以Na2O當(dāng)量計(jì))的配比來(lái)研究Cr6+/Pb2+/Zn2+/Cd2+四種重金屬離子對(duì)堿礦渣水泥水化放熱特性、凝結(jié)、硬化及強(qiáng)度等性能影響,結(jié)合孔結(jié)構(gòu)測(cè)試、XRD、FT-IR、SEM等微觀測(cè)試手段,分析了重金屬離子的加入對(duì)其水化產(chǎn)物結(jié)構(gòu)的影響。研究結(jié)果表明:1)Cr6+摻量低于2%條件下,水玻璃為堿組分時(shí),隨著摻量的增加,堿礦渣水泥的水化進(jìn)程延遲,水化熱降低,凝結(jié)時(shí)間延長(zhǎng),抗壓強(qiáng)度先增加后降低。微觀測(cè)試表明水玻璃為堿組分時(shí),Cr6+的摻入使得堿礦渣水泥石中沒有發(fā)現(xiàn)新的晶體生成,其小孔徑孔增多,孔隙增加,孔結(jié)構(gòu)細(xì)化,且水化產(chǎn)物結(jié)構(gòu)部分區(qū)域松散不夠致密,對(duì)水化產(chǎn)物的結(jié)構(gòu)有一定的影響。2)Pb2+摻量低于2%條件下,同Cr6+一樣,水玻璃為堿組分時(shí),隨著摻量的增加,堿礦渣水泥的水化進(jìn)程延遲,水化熱降低,凝結(jié)時(shí)間延長(zhǎng),抗壓強(qiáng)度先增加后降低。微觀測(cè)試表明水玻璃作為堿組分時(shí)Pb2+的摻入對(duì)堿礦渣水泥的孔隙影響不大,水化產(chǎn)物結(jié)構(gòu)裂縫增多變寬,對(duì)水化產(chǎn)物的結(jié)構(gòu)有一定的影響。3)Zn2+摻量低于1%條件下,不同堿組分時(shí),隨著摻量的增加,堿礦渣水泥的水化進(jìn)程延遲,水化熱降低,凝結(jié)時(shí)間明顯延長(zhǎng),抗壓強(qiáng)度逐漸降低。但是當(dāng)水玻璃模數(shù)為2.48時(shí),摻量過(guò)高會(huì)使堿礦渣水泥出現(xiàn)速凝現(xiàn)象。微觀測(cè)試表明水玻璃為堿組分時(shí)摻入Zn2+的堿礦渣水泥沒有發(fā)現(xiàn)新的晶體生成,但其孔隙減少,且其水化產(chǎn)物結(jié)構(gòu)部分區(qū)域松散不夠致密。4)Cd2+摻量低于2%條件下,Na OH為堿組分時(shí),隨著摻量的增加,堿礦渣水泥的水化進(jìn)程延遲,水化熱降低,凝結(jié)時(shí)間延長(zhǎng)。模數(shù)1.5的水玻璃為堿組分時(shí),Cd2+具有促凝作用,模數(shù)2.48的水玻璃為堿組分時(shí),摻量越大,堿礦渣水泥的初凝時(shí)間先略微增加后減少,終凝時(shí)間越長(zhǎng)。Cd2+對(duì)堿礦渣水泥石的抗壓強(qiáng)度的影響不大;水玻璃作為堿組分時(shí)摻入Cd2+的堿礦渣水泥沒有發(fā)現(xiàn)新的晶體生成,其孔隙減少,水化產(chǎn)物結(jié)構(gòu)疏松不夠致密。
[Abstract]:With the rapid development of economy in China, the environmental pollution problem is becoming more and more serious, which brings great pressure to the society, and the disposal of heavy metal wastes is paid more and more attention. At present, cement curing method is one of the important methods to treat heavy metal waste. Traditional silicate cement based materials have some obvious defects such as high capacity ratio of solidified heavy metal, high concentration of heavy metal leaching, poor durability, poor resistance to acid and sulfate, and so on. The hydration product of alkali slag cement is mainly C-S-H gel with low ratio of calcium to silicon, which can effectively immobilize toxic heavy metal ions. It is a new type of low carbon cementitious material with significant environmental and economic benefits. The influence of heavy metal ions on the hydration and structure formation of alkali slag cement is studied, which provides a technical basis for further understanding the mechanism of consolidation of heavy metal ions in alkali slag cement, and has important social significance in promoting its application. In this paper, the effects of Cr6 / Pb _ 2 / Zn _ 2 / CD _ 2 heavy metal ions on the hydration heat release characteristics, condensation, hardening and strength of alkali slag cement were studied by using the ratio of water to binder 0.3 and alkali equivalent 5% (calculated as Na2O equivalent). The effect of the addition of heavy metal ions on the structure of hydration products was analyzed by means of microcosmic measurement of pore structure, such as XRDX FT-IRU SEM. The results show that when the content of Cr6 is less than 2%, the hydration process of alkali slag cement is delayed, the hydration heat decreases, the setting time is prolonged, and the compressive strength increases first and then decreases with the increase of water glass content. The microcosmic test shows that when sodium silicate is alkali component, the addition of Cr6 causes no new crystal formation in alkali slag cement, and the small pore size increases, the pore structure is fine, and the structure of hydration product is loose and not compact enough. The hydration process of alkali slag cement is delayed, the hydration heat decreases and the setting time is prolonged with the increase of the content of water glass, when the content of Cr6 is less than 2%, the hydration process of alkali slag cement is delayed, the hydration heat decreases, and the setting time is prolonged with the increase of the content of water glass. The compressive strength first increases and then decreases. The microcosmic test shows that when sodium silicate is used as alkali component, the addition of Pb2 has little effect on the pore size of alkali slag cement, and the crack of hydration product increases and widens, which has a certain influence on the structure of hydration product (3) when the content of Zn2 is less than 1%, the different alkali components can be obtained. With the increase of the content of alkali slag cement, the hydration process of alkali slag cement is delayed, the hydration heat decreases, the setting time is obviously prolonged, and the compressive strength decreases gradually. However, when the modulus of sodium silicate is 2.48, the rapid setting of alkali slag cement will occur when the content of sodium silicate is too high. Microscopic measurements showed that no new crystal formation was found in alkali slag cement mixed with Zn2 when sodium silicate was alkali component, but the pore size was decreased, and the structure of hydration product was loose and not compact enough.) when the content of Cd2 was less than 2%, the sodium hydroxide was the base component. With the increase of the content of alkali slag cement, the hydration process of alkali slag cement is delayed, the hydration heat decreases and the setting time is prolonged. The sodium silicate with modulus 1.5 has the effect of promoting coagulation. When the water glass with modulus 2.48 is the alkali component, the initial setting time of alkali slag cement increases slightly and then decreases with the increase of the content of water glass with modulus 2.48. The longer the final setting time, the less the effect on the compressive strength of alkali slag cement, but no new crystal formation was found in the alkali slag cement mixed with Cd2 when sodium silicate was used as an alkali component, the porosity was reduced, and the structure of hydration product was loose and not dense enough.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TQ172.1
本文編號(hào)：2197799
[Abstract]:With the rapid development of economy in China, the environmental pollution problem is becoming more and more serious, which brings great pressure to the society, and the disposal of heavy metal wastes is paid more and more attention. At present, cement curing method is one of the important methods to treat heavy metal waste. Traditional silicate cement based materials have some obvious defects such as high capacity ratio of solidified heavy metal, high concentration of heavy metal leaching, poor durability, poor resistance to acid and sulfate, and so on. The hydration product of alkali slag cement is mainly C-S-H gel with low ratio of calcium to silicon, which can effectively immobilize toxic heavy metal ions. It is a new type of low carbon cementitious material with significant environmental and economic benefits. The influence of heavy metal ions on the hydration and structure formation of alkali slag cement is studied, which provides a technical basis for further understanding the mechanism of consolidation of heavy metal ions in alkali slag cement, and has important social significance in promoting its application. In this paper, the effects of Cr6 / Pb _ 2 / Zn _ 2 / CD _ 2 heavy metal ions on the hydration heat release characteristics, condensation, hardening and strength of alkali slag cement were studied by using the ratio of water to binder 0.3 and alkali equivalent 5% (calculated as Na2O equivalent). The effect of the addition of heavy metal ions on the structure of hydration products was analyzed by means of microcosmic measurement of pore structure, such as XRDX FT-IRU SEM. The results show that when the content of Cr6 is less than 2%, the hydration process of alkali slag cement is delayed, the hydration heat decreases, the setting time is prolonged, and the compressive strength increases first and then decreases with the increase of water glass content. The microcosmic test shows that when sodium silicate is alkali component, the addition of Cr6 causes no new crystal formation in alkali slag cement, and the small pore size increases, the pore structure is fine, and the structure of hydration product is loose and not compact enough. The hydration process of alkali slag cement is delayed, the hydration heat decreases and the setting time is prolonged with the increase of the content of water glass, when the content of Cr6 is less than 2%, the hydration process of alkali slag cement is delayed, the hydration heat decreases, and the setting time is prolonged with the increase of the content of water glass. The compressive strength first increases and then decreases. The microcosmic test shows that when sodium silicate is used as alkali component, the addition of Pb2 has little effect on the pore size of alkali slag cement, and the crack of hydration product increases and widens, which has a certain influence on the structure of hydration product (3) when the content of Zn2 is less than 1%, the different alkali components can be obtained. With the increase of the content of alkali slag cement, the hydration process of alkali slag cement is delayed, the hydration heat decreases, the setting time is obviously prolonged, and the compressive strength decreases gradually. However, when the modulus of sodium silicate is 2.48, the rapid setting of alkali slag cement will occur when the content of sodium silicate is too high. Microscopic measurements showed that no new crystal formation was found in alkali slag cement mixed with Zn2 when sodium silicate was alkali component, but the pore size was decreased, and the structure of hydration product was loose and not compact enough.) when the content of Cd2 was less than 2%, the sodium hydroxide was the base component. With the increase of the content of alkali slag cement, the hydration process of alkali slag cement is delayed, the hydration heat decreases and the setting time is prolonged. The sodium silicate with modulus 1.5 has the effect of promoting coagulation. When the water glass with modulus 2.48 is the alkali component, the initial setting time of alkali slag cement increases slightly and then decreases with the increase of the content of water glass with modulus 2.48. The longer the final setting time, the less the effect on the compressive strength of alkali slag cement, but no new crystal formation was found in the alkali slag cement mixed with Cd2 when sodium silicate was used as an alkali component, the porosity was reduced, and the structure of hydration product was loose and not dense enough.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TQ172.1
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