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SINTERING BEHAVIOUR OF WHEAT STRAW ASH WITH ADDITION OF ADDITIVE UNDER ELEVATED TEMPERATURE

机译:高温下小麦秸秆灰的烧结行为及添加剂的添加

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In this work, the use of one non-commercial additive to reduce the wheat straw ash sintering tendencywas investigated at elevated temperatures. Sewage sludge was blended with wheat straw in different mass ratios.Laboratory sintering tests were performed on the wheat straw and mixtures in the temperature range from 550℃ to1000℃. The ash from the wheat straw and mixtures with sewage sludge addition were producted under differentashing temperatures and characterized with XRF, XRD and SEM/EDX analysis. Wheat straw ash has high sinteringtendency with formation of alkali chlorides and alkali silicates at low ashing temperature, which presented asamorphous phase in large amount. SEM/EDX analysis showed that the wheat straw ash started to sinter andaggmolerate even at temperature for 750℃ with presence of sylvite. Sewage sludge was proven to decrease the wheatstraw ash sintering temperture in this work. The crystalline phases in wheat straw ash changed to potassiumaluminum silicates and aluminum oxides with addition of sewage sludge. All of these phases have high meltingpoints and contributed to the lower sintering tendency of wheat straw ash. The dilution effect from the sewage sludgeis considered the other reason related with the decrease of sintering for wheat straw ash. In addition, adsorption ofpotassium chlorides and sulfates on the sewage sludge particle surfaces was also observed with SEM/EDX analysis.Results from the SEM/EDX analysis had good agreement with XRD analysis and offered more supportinginformation with BSE image and spot elements quantification.
机译:在这项工作中,研究了在高温下使用一种非商业添加剂来减少麦草灰的烧结趋势。将污泥与麦秸按不同质量比混合。在550℃至1000℃的温度范围内对麦秸和混合物进行实验室烧结试验。在不同的灰化温度下生产小麦秸秆的灰分和添加污水污泥的混合物,并通过XRF,XRD和SEM / EDX分析对其进行表征。麦草灰的烧结性高,在低灰化温度下会形成碱金属氯化物和碱金属硅酸盐,并大量呈现非晶态相。 SEM / EDX分析表明,即使在存在钾盐的情况下,即使在750℃的温度下,小麦秸秆灰也开始烧结和团聚。在这项工作中,污水污泥被证明可以降低麦秸灰的烧结温度。小麦秸秆灰分中的结晶相增加了污水污泥,变为硅酸铝钾和氧化铝。所有这些相均具有较高的熔点,并有助于降低小麦秸秆灰的烧结趋势。污水污泥的稀释作用被认为是与减少小麦秸秆灰烧结有关的另一个原因。 SEM / EDX分析也观察到氯化钾和硫酸钾在污水污泥颗粒表面的吸附。SEM/ EDX分析的结果与XRD分析吻合良好,并为BSE图像和斑点元素定量提供了更多的支持信息。

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