Research on Recycling of Phosphorus Tailings Powder in Open-Graded Friction Course Asphalt Concrete

Abstract

The reuse in high-value materials is one of the important resource utilization approaches of phosphorus tailings. At present, a mature technical system has been formed on the reuse of phosphorus slag in building materials, and silicon fertilizers in the extraction of yellow phosphorus. But there is a lack of research on the high-value reuse of phosphorus tailings. In order to make safe and effective utilization of phosphorus tailing resources, this research concentrated on how to solve easy agglomeration and difficult dispersion of phosphorus tailing micro-powder, when it was recycled in road asphalt. In the experimental procedure, phosphorus tailing micro-powder is treated in two methods. One method is to directly add it with different contents in asphalt to form a mortar. Dynamic shear tests were used to explore the effect of phosphorus tailing micro-powder on the high-temperature rheological properties of asphalt influence mechanism of material service behavior. The other method is to replace the mineral powder in asphalt mixture. The effect of phosphate tailing micro-powder on the water damage resistance in open-graded friction course (OGFC) asphalt mixtures was illustrated, based on the Marshall stability test and the freeze–thaw split test. The research results show that the performance indicators of the modified phosphorus tailing micro-powder meet the requirements for mineral powder in road engineering. Compared with standard OGFC asphalt mixtures, the residual stability of immersion and freeze–thaw splitting strength were improved when replace the mineral powder. The residual stability of immersion increased from 84.70% to 88.31%, and freeze–thaw splitting strength increased from 79.07% to 82.61%. The results indicate that phosphate tailing micro-powder has a certain positive effect on the water damage resistance. These performance improvements can be attributed to the larger specific surface area for phosphate tailing micro-powder than ordinary mineral powder, which can effectively adsorb asphalt and form structural asphalt. The research results are expected to support the large-scale reuse of phosphorus tailing powder in road engineering.

Identifying the influence of expanded clay concrete based on a binder from phosphorus slag on the strength of structures from leaked concrete

“…But issues related to the experimental study of efficiency and removal require further study in order to determine the best conditions for TP, taking into account unstable temperature and the presence of other contaminants that can adversely affect removal efficiency in unstable conditions. This approach is used in [2], however, in the chemical industry, on average, about 8-10 % of the cost of the main products produced is spent on waste disposal. At the same time, dumps, as a rule, occupy valuable agricultural land and serve as a source of industrial pollution of the atmosphere and water bodies.…”

“…In [2], the author suggests that reuse in valuable materials is one of the important approaches to the use of phosphorus tailings resources. At present, a mature technical system has been developed for the reuse of phosphorus slag in building materials and silicon fertilizers in the extraction of yellow phosphorus.…”

“…In the analyzed scientific papers [1][2][3][4][5][6][7][8][9][10][11][12][13][14], various aspects of applying a filler to the main material of a structure are studied. An unexplored problem remains, the experimental justification for increasing the strength characteristics of the base material (concrete in our case) by aggregates.…”

Laboratory Evaluation of Porous Asphalt Mixtures with Cellulose Ash or Combustion Soot as a Filler Replacement

“…Some authors attempted to use recycled glass fiber from wind turbine blades in asphalt mixtures, showing that this can provide interesting benefits to the bituminous binder and reduce pavement deformation and rutting effects [25]. Other authors looked for recycled filler alternatives in asphalt mixtures, like phosphorus tailing powder, obtaining interesting benefits in terms of resistance to water damage [26]. Bottom ashes from different industries have been also used in asphalt mixtures with interesting results [10,23,[27][28][29][30][31].…”