Study on the characteristics of tungsten slag and its properties in the cement solidification system

The basic characteristics of tungsten slag produced in the production of ammonium para tungstate (APT) and its ground tungsten slag powder were investigated. The mechanical strength characteristics and development of cement-solidified tungsten slag cementation system with raw tungsten slag mixed artificial sand as fine aggregate were discussed by cement solidification/stabilization method. The harmful metal content and leaching concentration of tungsten slag and its cement-solidified cementation system were compared. The test results show that the particle-size distribution of ground tungsten slag presents a more uniform characteristic. When the content of the ground tungsten slag is more than 30% as admixture, the strength ratio does not meet the requirements of the specification. In addition, when the raw tungsten slag be used partly as fine aggregate, the mechanical strength of cement-solidified tungsten slag cementation system is fine. Moreover, the cement solidification/stabilization technology can effectively reduce the leaching concentration of arsenic in tungsten slag. The mechanism of solidification/stabilization of arsenic by Portland cement includes adsorption and precipitate to form calcified arsenic insoluble.