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Continuous Reduction Process of Titanium Chloride by Magnesium

镁连续还原氯化钛工艺

基本信息

批准号：
10355031
负责人：
ONO Katsutoshi
金额：
$ 19.14万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A).
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10355031/
关键词：
titanium chloride Magnesium Reduction Fine Powder Niobium chloride Tantalum chloride Molten Salt Magnesium Chloride チタン製造製錬還元反応凝集

项目摘要

A process to produce titanium metal in the molten salt was developed for continuous reduction. Titanium chloride and magnesium, which are used as raw materials for the conventional process, are separated into the two molten layers because of density difference. Titanium chloride gas is blown into the lower molten salt, and reduced by the upper magnesium. Titanium settled in the salt piles up on the vessel bottom, and it is extracted from the molten salt.The salt composition was chosen from KCI, NaCl and LiCl, to separate the molten salt and the reductant. The dense MgO was suitable for the crucible material. The obtained powder was about 1/10 finer than the titanium particle by the Kroll method. The main mechanism of reduction was the reduction by magnesium dissolved in the molten salt, and the reduction in the magnesium layer was additive. Considering this mechanism clarified here, a new technique that titanium chloride is blown without any direct contact with metallic magnesium was proposed. The yield was over 80%.On the other hand, the obtained particles were so small and well isolated that the separation from the salt became difficult. First solution was to adapt the condensification process such as liquid cyclone. The excess reductant adhered to titanium particles and enhanced the corsening. The second solution was to take a two-stepwise reduction. In the first step, the lower titanium chlorides are formed in the molten salt by resolving a part of formed titanium powder. In the second step, these highly concentrated chlorides are reduced by magnesium. This proposal are easily operated continuously, and the coarser particles were recovered easily.Similarly niobium and tantalum chlorides were reduced and their pure metallic powders were obtained. Their fine grain size was suitable for compact large capacity condensers.

开发了一种熔盐连续还原生产金属钛的工艺。传统工艺的原料氯化钛和镁由于密度不同而被分离成两个熔融层。将氯化钛气体吹入下层熔盐中，并被上层镁还原。钛沉淀在熔盐中，堆积在容器底部，从熔盐中提取钛，选用KCl、NaCl、LiCl三种盐组成，分离熔盐和还原剂。致密MgO适合作坩埚材料。所获得的粉末比通过Kroll法得到的钛颗粒细约1/10。还原机理主要是熔盐中溶解的镁的还原，镁层中的还原是加和的。考虑到本文阐明的这一机理，提出了一种在不与金属镁直接接触的情况下吹入氯化钛的新技术。另一方面，由于所得产品颗粒细小，分散性差，与盐的分离变得困难。第一个解决方案是采用冷凝工艺，如液体旋流器。过量的还原剂附着在钛颗粒上，促进了钛颗粒的烧结。第二个解决方案是采取两步减少。在第一步骤中，通过分解一部分形成的钛粉末在熔融盐中形成低级钛氯化物。在第二步中，这些高浓度的氯化物被镁还原。该方法易于连续操作，粗颗粒易于回收，同样也可将氯化铌和氯化钽还原，得到纯净的金属粉末。其晶粒细小，适用于紧凑型大容量冷凝器。