磷酸鹽含量對廢棄污泥燒製環保水泥之水化特性影響

Influence of Phosphate on the Properties of Eco-cement Made from Waste Sludge

林凱隆(Kae-Long Lin) ； 林忠逸(Chung-Yei Lin) ； 王鯤生(Kuen-Sheng Wang) ； 林家宏(Chia-Hung Lin)

《環境保護》 27卷2期 (2004/12) Pp. 204-217

https://doi.org/10.30017/EP.200412.0005

摘要

本研究係針對淨水污泥灰、下水污泥灰及工業污泥灰之作為水泥生料時，廢棄污泥中磷酸鹽含量之對水化作用影響進行探討。結果顯示，三種環保水泥之重金屬溶出均符合法規值。Ⅰ型環保水泥之C3S與波特蘭水泥相似。Ⅰ型環保水泥漿體之初終凝、抗壓強度與水化程度與波特蘭水泥漿體相似，顯示廢棄污泥可取代20%之生料。而Ⅱ及Ⅲ型環保水泥漿體因含有α-C2S而造成初終凝、抗壓強度及水化程度之延緩。廢棄污泥灰做為水泥原料時，當磷酸鹽大於0.46%，均可能對水泥燒製或水化過程中產生負面的影響。

關鍵字

磷酸鹽 ； 環保水泥 ； 抗壓強度 ； 水化程度

並列摘要

The study focused on influence of phosphate on the hydration characteristics of water purification sludge ash, sewage sludge ash and industry sludge ash, utilized as cement raw material. The results indicated the leaching concentrations of all three types of ecocement clinkers met the regulatory thresholds. The C3S content in the ECO-I clinkers was similar to that in the OPC. The results show that the ECO-I pastes had a similar setting time, final setting time, compressive strength, degree of hydration compared to the OPC pastes. The results indicate that it is feasible to use sludge ashes and ferrate waste to replace up to 20% of the mineral components of raw materials for cement. A delay in the setting time observed in the ECO-Ⅱ and ECO-Ⅲ pastes may be primarily attributed to the larger amounts of α-C2S, which delayed the setting time. In the ECO-Ⅱ and ECO-Ⅲ pastes the amount of α-C2S resulted compressive strength retardation of that early stage. Also, ECO-Ⅱ and ECO-Ⅲ pastes show lower degree of hydration values at all ages of hydration. The main reason for this is that the amounts of α-C2S causes the degree of hydration in the ECO-Ⅱ and ECO-Ⅲ paste to decrease more than that of pure cement. Therefore, waste sludge ash utilized as cement raw material, the interferences of phosphate ＞0.46% might produce adverse effects on cement burning or hydration.

並列關鍵字

phosphate ； Eco-cement ； Degree of hydration