Effect of the calcinations temperatures of phosphate washing waste on the structural and mechanical properties of geopolymeric mortar

Abstract

h i g h l i g h t s Phosphate washing waste is one of phosphate sub product. The calcined phosphate washing waste was used as geopolymer precursors. The performance and the formed phases after alkali activation depend with calcination temperature.

Mineralogical and chemical investigation of Tunisian phosphate washing waste during calcination

“…As mentioned in the previous work [26], the phosphate washing waste presents an important amount of silica SiO 2 42%, calcium CaO 25.5%, phosporous P 2 O 5 10% and alumina Al 2 O 3 9.77%. The PWW was characterized by a major population of grain size equals to 7.5 lm and a less dominant population with a particle size equals to 100 lm.…”

“…The results obtained from the thermal behavior of the PWW Fig. 2 are presented in the previous work [26]. The TG curve shows three mass losses, respectively, from 30 to 140°C, from 200°C to 500°C and from 650°C to 770°C with a total mass loss approximately 17%.…”

“…Discussing the case of the phosphate sludge, this waste was generating with quantity about 1 ton for the production of 1 ton of phosphate [2,6,[16][17][18] which is deposited in large pond and causes a serious problem to the environment. Therefore, the phosphate sludge has been a question in the latest 10 years of great interest in a wide range of fields: to control acid mine drainage [17], in ceramic [4,17,19,20], as aggregate [17,21,22], as a natural absorbent for phosphorous removal from aqueous solutions [15,16,23], as a membrane [24,25] and as a precursor for geopolymeric materials [26,27].…”

Binding Properties of Mechanically Activated Nepheline Containing Mining Waste

“…The advantages of geopolymer binders for replacing traditional Portland cement in particular are supported by the fact that in various industries there are many by-products that are suitable for use as raw materials for geopolymers [17][18][19]. In recent years, there has been an increasing number of studies on the use of mining waste in the preparation of geopolymer materials both as a component of an alkali-activated binder and as an aggregate [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34]. Geopolymer materials display special physical-mechanical and technical properties: high durability and strength, particularly bending strength; resistance to chemical aggressive environments, and high temperatures.…”

Geopolymer Synthesis Using Garnet Tailings from Molybdenum Mines

“…Consequently, some natural minerals or mine tailings that have a rich silico-aluminate composition are a potential resource for the fabrication of geopolymers [17][18][19]. During the past two decades, there has been an increasing number of studies on the fabrication of geopolymers using mine tailings as the main sources, such as iron ore tailing [20,21], volcanic ash [22][23][24], red mud [25], fly ash [26][27][28], phosphate sludge [29,30] and vanadium tailings [31,32].…”