Cement Bypass Dust as an Ecological Binder Substitute in Autoclaved Silica–Lime Products

Abstract

The cement industry is one of the most developed industries in the world. However, it consumes excessive amounts of natural resources and can negatively impact the environment through its by-products: carbon dioxide (CO2), cement clinker dust (CKD) and cement bypass dust (CBPD). The amount of dust generated in the cement clinker production process depends largely on the technology used. It typically ranges from 0 to 25% by weight of the clinker, and a single cement plant is capable of producing 1000 tons of CBPD per day. Despite practical applications in many areas, such as soil stabilisation, concrete mix production, chemical processing or ceramic and brick production, the dust is still stored in heaps. This poses an environmental challenge, so new ways of managing it are being sought. Due to the significant content of free lime (>30%) in CBPD, this paper uses cement bypass dust as a binder replacement in autoclaved silica–lime products. Indeed, the basic composition of silicate bricks includes 92% sand, 8% lime and water. The investigation shows that it is possible to completely replace the binder with CBPD dust in the autoclaved products. The obtained results showed that all properties of produced bricks were satisfactory. The study concluded that many benefits could be achieved by using cement bypass dust in the production of bricks, including economic bricks for building, reducing the dependency on natural resources, reducing pollution and reducing negative impacts on the environment.

Recycling of bypass cement kiln dust in the production of eco-friendly roof tiles

“…The bypass cement kiln dust has two types the first type that produced in the cold section of the furnace while the other type that produced after adding limestone to avoid clogging the ducts. These types have different chemical and physical properties according to the type of raw materials, the technology used for clinker burning, the using fuel and the method used in dust removal [1].…”

Characteristics Analysis of Chlorine Bypass Dust and Water- washed Residue

“…의 재활용을 추진하고 있다 [2][3][4][5] . 염소 바이패스 분진의 주 성분은 칼슘, 알칼리 및 염소 성분으로 구성되어 있으며, 일부 미량의 중금속 성분이 포함되어 있다 6,7) .…”

Recycled Materials in Civil Engineering Application

“…Waste materials were also used to produce other building materials, including autoclaved bricks and ballast mixtures. Bork et al [7] used cement bypass dust (CBPD) to produce autoclaved bricks. It has been shown that the amount of CBPD dust used in autoclaved products depends on the chemical composition of the dust and, in particular, on the content of free CaO.…”