Preparation of Autoclaved Water Permeable Brick from Ferronickel Slag

The water permeable bricks with good performance were prepared with ferronickel slag and quicklime as raw materials.Rupture strength,permeability coefficient,abrasion resistance and frost resistance of samples were studied.The results showed that the addition of quicklime and slag powder could improve rupture strength,frost resistance and abrasion resistance of the samples,but reduce the permeability coefficient.With the increase of autoclave temperature and processing time,rupture strength,abrasion resistance and frost resistance of the samples increased gradually,while the permeable coefficient decreased gradually.The industrial trail test indicated that the performance of products met standard of GB/T 25993-2010,when the ferronickel slag raw materials (84%),quicklime (16%),slag powder (20% of ferronickel slag raw materials) and gypsum (2%) were mixed as raw materials and autoclaved at 190 ℃ for 6 h.