Abstract
The paper addresses the issue of recycling granulated blast-furnace slag (gBFS) as a source for production of cement-free binder materials for further usage in rare-earth metals production for radioactive waste disposal. The use of the vortex layer activator was provided as main technique allowing to produce high-dispersed chemically activated binders. The paper examines the effect of processing conditions on the physical-chemical and mechanical properties of the resulting BFS-based cement-free materials and gBFS-based concretes.
Highlights
Radioactive waste is a major problem in the production of rare-earth metals
The main aim of the work is developing of energy efficient technology for production of clinker-free materials (CFM) and CFM-based concretes by vortex layer mechanical activation using granulated blast-furnace slag (gBFS) as source materials [9] and investigation of mechanical properties of produced materials depending on preparation conditions
Chemical composition of pristine gBFS is shown in the Table 1
Summary
Burial thorium and its products are extremely important. The easiest way - is cementing slurry containing all the radionuclides, which are contained in the feedstock, with burial in earthen trenches. The disadvantage of this method is significantly higher consumption of expensive cement. The use of waste iron and steel industry may reduce the cost of the process [1]. Typical industrial metallurgical production results in formation of large amount of technological wastes – ash, slag etc. Large amounts of steel slag are wasting soil and water, resulting in high threat to natural resources. Typical yearly production of steel slag in Russia is 5-7 Mton, which makes this problem very important [2]
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