Geopolymer Bricks Using Iron Ore Tailings, Slag Sand, Ground Granular Blast Furnace Slag and Fly Ash

Abstract

World is pound with million tonnes of industrial wastes such as ground granulated blast furnace slag (GGBS), flyash and mine tailings as a various industrial waste. The best way to make use of these wastes is to incorporate these materials as structural elements, which in turn minimizes the carbon foot print. In this contest, this study focuses on using iron ore tailings and slag sand as a replacement for clay or natural sand for the production of stabilized geopolymer blocks. Also, in this study geopolymer is used as a stabilizer instead of cement. Development of geopolymer binder based bricks using flyash and ground granulated blast furnace slag has been carried out in this research. The study includes mechanical properties of the geopolymer bricks. Sodium silicate (Na 2 SiO 3) and sodium hydroxide (NaOH) solution have been used as alkaline activators. The ratio of alkaline liquid to aluminosilicate solid ratio and percentage of binder had major influence on the strength of brick. The bricks were casted and cured at ambient temperature. The compressive strength was carried out at 7, 14 and 28 days.

Mine Waste‐Based Next Generation Bricks: A Case Study of Iron Ore Tailings, Red Mudand GGBS Utilization in Bricks

“…Both IOT and RM geopolymer bricks have been confirmed as high-quality bricks.Figure 13 presents that the water absorption for all the mix compositions is less than 20% and the values are as per IS code recommendations. e efflorescence results of all the compositions fulfill the standards of IS: 3495-Part [3]. From Figure 14, it is evident that there is no significant variation of specific gravity for varying percentages of iron ore tailings and red mud.…”

“…Brick manufacture by blending industrial wastes such as fly ash, GGBS, and slag sand with 8M and 10M geopolymer binder were used to produce high-strength bricks of 25.30 Mpa [3]. IOT has also proven to have potential as aggregates in concrete [4][5][6].…”

Synthesis of geopolymers based on mechanically activated low‐calcium iron‐rich fly ash

“…According to the data obtained, this did not decrease [17][18][19] and might even increase 16 the strength of the geopolymer. There was also a positive effect, or at least no negative effect of higher iron content in raw materials on the strength of geopolymers prepared using iron-rich FA, 20,21 iron ore tailings, 22 steel slag, 23 and red tropical soils. 24 In general, it may be noted that many issues regarding the reactivity of FA of various chemical and mineralogical compositions in strongly alkaline media, as well as the role of iron in the geopolymerization processes, are not well understood.…”

Recycling of mining tailings into construction materials such as geopolymer cement.

“…Una forma de hacerlo es utilizarlos como materia prima para la producción de insumos para otras industrias, como la industria de la construcción [6][8] [9][10] [11] [12]. Por otro lado, los estudios han demostrado que los relaves de cobre [13] [14][1] [15], oro [15][14] [16][17] [18] y hierro [19] [20][21] [22][23] mezclados con geopolímeros [19][14] [20] pueden ser utilizados como sustituto parcial del cemento en la construcción de concreto o para fabricar ladrillos de construcción.…”