Processing of titanium-containing ores together with the extraction of all the major elements is currently an urgent problem for the usage of mineral products. It is shown that none of the existing processing schemes allows the simultaneous extraction of all the major useful elements such as iron, titanium and vanadium from titanium-containing iron ores. This problem can be solved using a selective extraction of these elements based on ideas regarding the electron reduction mechanism. The following has been experimentally studied: the reaction propagation of solid-phase selective iron reduction that is deep in the grain layer of ilmenite concentrate from the surface of its contact with the powder of carbon-containing material. The results are presented for determining the amount of released metal phase depending on the distance from the concentrate–reducing agent contact boundary. Based on the results regarding the amount of the released metal phase, a conclusion was made for the diffusion processes in a layer of concentrate grains that contact only between themselves, thus determining the rate of iron reduction process. It is shown that near the contact surface between the solid reducing agent and the layer of concentrate grains, the rate of iron reduction is higher than the formation rate of the phases with high iron content from ilmenite. Deep in the ilmenite concentrate layer, the process of iron reduction is preceded by the formation of an iron-containing silicate phase from the concentrate grains, where iron is reduced earlier than it is in the ilmenite grains. The formation of iron-containing silicate phase promotes ilmenite grains to be sintered. Thus, upon the concentrate layer contacting with solid reducing agent in the absence of contact between each ilmenite grain and solid reducing agent, the point contact between grains and void presence within the layer do not prevent the reduction process propagation in the grain layer that contact only with each other.

中文翻译：

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钛精矿层中固相铁还原的传播

含钛矿石的加工以及所有主要元素的提取是目前矿产品使用的一个紧迫问题。结果表明，现有的处理方案都不允许从含钛铁矿石中同时提取所有主要有用元素，如铁、钛和钒。这个问题可以通过基于有关电子还原机制的想法选择性提取这些元素来解决。已经通过实验研究了以下内容：固相选择性铁还原的反应传播，从钛铁矿精矿与含碳材料粉末的接触表面开始，它位于钛铁矿精矿颗粒层的深处。给出的结果用于根据距浓缩物-还原剂接触边界的距离确定释放的金属相的量。根据释放的金属相量的结果，得出了在仅相互接触的精矿颗粒层中的扩散过程的结论，从而确定了铁还原过程的速率。结果表明，在固体还原剂与精矿层接触面附近，铁还原速率高于钛铁矿高铁相的形成速率。在钛铁矿精矿层深处，铁还原过程之前是由精矿颗粒形成含铁硅酸盐相，在那里铁比钛铁矿颗粒中的铁更早被还原。含铁硅酸盐相的形成促进了钛铁矿晶粒的烧结。因此，当精矿层在每个钛铁矿颗粒和固体还原剂之间没有接触的情况下与固体还原剂接触时，颗粒之间的点接触和层内存在的空隙不会阻止仅接触的颗粒层中的还原过程传播彼此。