How to choose reducing agent for titanium rod?

The reducing activity of various reducing agents of titanium rods on ilmenite decreases in the following order: charcoal > anthracite > petroleum coke > metallurgical coke. Charcoal has high activity and can make the charge have a greater resistance, but it is expensive and not suitable for use.
Petroleum coke has a high carbon content and low ash content, but has low activity and is expensive. It is not an ideal reducing agent and is only used in small-scale production of high-quality titanium slag. Production practice at home and abroad shows that anthracite is a suitable reducing agent for smelting high-titanium slag. It has high carbon content and activity, low price, and reliable source. After being mixed with ilmenite concentrate, the resistance is relatively large (80 ~340k0/cm3), but low ash, low volatile matter and low sulfur anthracite should be selected.
In principle, all carbon-containing materials, such as coal, petroleum coke, metallurgical coke, charcoal and graphite powder, can be used as reducing agents for smelting high titanium slag.
From the perspective of process and economic rationality, a reducing agent with high activity, low conductivity, low ash, low volatile matter, low sulfur content and cheap should be selected. The high activity of the reducing agent can increase the reduction speed, reduce smelting time, reduce energy consumption and improve production capacity. The reducing agent has low conductivity, which can improve the performance of the charge and ensure a reasonable power supply system. The reducing agent has low ash content, which can reduce its pollution to the high titanium slag of the product. The reducing agent has low volatile content, which can reduce the exhaust volume during the smelting process and is beneficial to the stability of the furnace conditions. As mentioned above, sulfur is a harmful impurity in smelting iron slag. There is no doubt that low-sulfur reducing agents should be selected as much as possible.