Other treatment methods for silicon slag

In addition to producing white carbon black, silica slag can also be used as auxiliary material of building materials, cement or ordinary Fire brick after treatment.
The following introduces a method of producing building material cement excipients using silicon slag. This method uses acidic silicon slag with recovered zirconium, which has a moisture content of about 80% and a HCI content of 2% to 3%. It is first mixed with waste alkali water containing about 10% NaOH in production, with a pH value of 6. Then, an appropriate amount of coal ash generated during alkali melting is added, and the calcium slag is neutralized with waste acid. After pressure filtration, dehydration, and drying, medium calcium silicon slag can be obtained. The product can be used for road construction and wall bricks, etc. The process flow is shown in the right figure.
Here is another introduction to a silicon slag treatment method. This method uses the waste heat from high-temperature sintering of zirconium sand and calcination of zirconium oxychloride as the heat source, and sends the silicon slag into a drying furnace to remove the water from the silicon slag. The dry silicon slag can be used as a raw material for refractory materials and glaze materials. This method can fully utilize production waste heat and is simple and convenient. In addition, silicon slag can be used to produce water glass from waste alkali solution.