Aluminothermic production of titanium alloys (Part 2): Impact of activated rutile on process sustainability
Aluminothermic production of titanium alloys (Part 2): Impact of activated rutile on process sustainability
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DOI：
10.30544/100
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发表时间：
2015-06
影响因子：
0.9
通讯作者：
S. Hassan-Pour;C. Vonderstein;M. Achimovičová;V. Vogt;E. Gock;B. Friedrich
中科院分区：
文献类型：
--
作者：
S. Hassan-Pour;C. Vonderstein;M. Achimovičová;V. Vogt;E. Gock;B. Friedrich
铝热法通过还原TiO 2并随后通过电渣重熔进行精炼，提供了一种降低成本的钛和钛合金的生产方法。铝热法涉及高加热速率、高温和短反应时间，并结合反应的自蔓延行为。通过将TiO2与五氧化二钒等合金元素的氧化物共还原，可以直接合成钛合金。使用金红石精矿进一步减少了工艺步骤。为了对金红石矿进行装料，需要进行复杂的热力学计算，同时考虑各种副组分的焓输入。铝热还原通常通过基于KClO4还原的高供热反应来增强。为了最大限度地减少氯基产品的使用，进行了广泛的研究，以调查使用机械活化的金红石作为铝热法的输入材料的可行性。由于机械活化，反应的本征焓增加，因此促进了具有减少量的KClO4的过程。一个主要的挑战是确定低活化持续时间和减少KClO4量之间的折衷。为了定义工艺窗口参数，如本征化学能（反应混合物的焓）、平衡温度和物理性质
The aluminothermic process provides a cost-reduced production method for titanium and titanium alloys by reduction of TiO2 with subsequent refining by electroslag remelting The aluminothermy involves high heating rates, high temperatures and short reactions times combined with a self-propagating behaviour of the reaction. By co-reduction of TiO2 and oxides of alloying elements such as vanadium pentoxide, direct synthesis of a titanium alloy is possible. The use of rutile ore concentrates causes a further reduction of process steps. In order to charge rutile ore complex thermodynamic calculations are required taking enthalpy input of various bycomponents into account. The aluminothermic reduction is conventionally enhanced by a highly heatproviding reaction based on the reduction of KClO4. In order to minimize the use of chlorine-based products extensive studies are made to investigate the feasibility of using mechanically activated rutile as input material for the aluminothermic process. Due to the mechanical activation the intrinsic enthalpy of the reaction is increased thus facilitates a process with reduced amount of KClO4. A major challenge represents the determination of a compromise between low activation duration and reduced KClO4 amount. In order to define the process window parameters like intrinsic chemical energy (enthalpy of the reaction mixture), equilibrium temperature and physical properties