The process of adjusting the composition of the titanium liquid alloy during the production of the titanium rod is called alloying, which includes the alloying of the titanium liquid in the electric furnace process and the fine-tuning of the alloy composition of the titanium liquid in the late stage of the refined process. The alloying of titanium rods produced by traditional electric furnaces in metallurgical engineering is generally pre-alloyed in the late oxidation and early recovery stages, and the alloy composition is fine-tuned in the late recovery, before titanium extraction, or during titanium extraction. The alloying of titanium rods produced by modern electric furnaces generally ends in the titanium package during the titanium extraction process. When the titanium is extracted, the alloying in the titanium package is pre-alloyed, and the accurate adjustment of the alloy composition ends in the refined furnace. The alloying operation mainly refers to the time and number of alloy participation.
alloy participation time. The general principles for metallurgical engineering to participate in ferroalloys are: elements with high melting point and not easy to be oxidized can be added early, such as nickel can participate with the charge, the yield is still above 95%; low melting point, easy to oxidize late participation, such as iron boron When participating in the titanium bag during the titanium extraction process, the recovery rate is only about 50%.
In addition, the deoxidation operation and alloying operation can not be separated. Generally speaking, the deoxidation element is added first, and the alloying element is added later; the deoxidation ability is relatively strong, and the more expensive alloy element should participate in the excellent degassing of the titanium liquid. For example, the participation order and purpose of oxidizable elements should be: adding aluminum to deoxidize 2 to 3 minutes before titanium extraction, adding titanium to fix nitrogen, adding boron during titanium extraction, and advancing boron recovery rate. In this case, the yields of the three are 65%, 50%, and 50%, respectively.
Number of participants. The chemical composition of metallurgical engineering has a great influence on titanium M and its function. On the spot, the amount of alloy participation is quickly and accurately calculated according to the type of titanium rod produced by smelting, the amount of titanium liquid in the furnace, the composition of the furnace, the composition of the alloy, and the yield of the alloy.
The ingredients of electric furnace adopt high carbon distribution, and its main purpose is:
In the melting stage of metallurgical engineering, when blowing oxygen to promote flux, carbon oxidizes before iron, and then reduces iron burning loss.
Carburizing can reduce the melting point of waste titanium and accelerate the melting.
(3) The carbon-oxygen reaction constitutes a molten pool agitation, which promotes the slag-titanium reaction and is beneficial to early de-disc.
(4) During the quintessential heating period, the vivid carbon-oxygen reaction expands the slag-titanium interface, which is conducive to further dephosphorization, the homogenization of the titanium liquid composition and temperature, and the floating of gas and inclusions.
(5) The vivid carbon-oxygen reaction contributes to the formation of foam slag, advances the heat transfer power, and accelerates the temperature increase process.
The amount of carbon and the method of participating in carbon, the method of blowing oxygen, the strength of oxygen supply, and the power of the furnace are very large.