Recycling manganese slag for cement rotary kiln technology introduction

Cement rotary kiln can be used during inexpensive manganese slag to partially replace the raw materials, can reduce production investment purposes. Because the chemical composition of manganese slag and cement siliceous raw materials are similar, without any direct manner can do siliceous cement raw material.

The practical test confirmed: the active manganese slag calcination after desulfurization activity as a cement mix index of greater than 73%, chemical and physical cement testing the indicators fully qualified, manganese slag as a cement raw material or a mixture of all kinds of indicators in full compliance GB3040485- 2013 GB.

Manganese slag as a raw material into the cement kiln firing points to note:

1. The ratio limits: due to the sulfur dioxide content of manganese slag caused by too high a sulfur base imbalance clinker and clinker to limit the sulfur dioxide, mixing in cement raw materials can add up to 4% manganese slag.

2. Modification of electrolytic manganese residue after removal of ammonia instead of gypsum used as cement retarder, cement batching fully meet the requirements, do not affect the physical properties of cement, cement dosage 7%.

3. manganese slag cement rotary kiln by desulfurization, sulfur trioxide cement batching and removal of all the ammonium sulfate, silica, aluminum oxide, ferric oxide, calcium oxide as the main component of cement ingredients can be adding cement raw ingredients around 10%, does not affect the characteristics of raw materials and an increase in raw material burnability.

In order to improve the production process, can be discarded cement rotary kiln firing generated during recycling, which includes a high concentration of sulfur dioxide and sulfur trioxide produced by the kiln gases, they can be re-treated for manganese metal production .