Production of Titanium Powders by the Calciothermic Reduction of TiO2
Production of Titanium Powders by the Calciothermic Reduction of TiO2
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TiO2 热热还原法生产钛粉
DOI：
10.2355/tetsutohagane1955.76.4_568
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发表时间：
1990
影响因子：
0.3
通讯作者：
R. Suzuki
中科院分区：
文献类型：
--
作者：
K. Ono;Tohru Okabe;M. Ogawa;R. Suzuki
根据Ca-CaO共存时钛中氧的平衡浓度的测量，在1273K时的脱氧极限为500ppm。在此基础上，在1273K下用饱和的Ca蒸气、液态的Ca和CaH_2粉末还原二氧化钛，然后在HCl、CH3COOH或NH4Cl的水溶液中洗涤CaO制备钛粉。用饱和钙蒸汽和液态钙还原的钛粉中的氧和钙含量分别不低于2000ppm和1000ppm。这是由于CaO被限制在烧结钛颗粒中，不能暴露在漂洗液中。还原后的二氧化钛-氧化钙混合物产生了1000-2000ppm的剩余氧，因此起始氧化物中CaO的存在对控制还原钛粉之间的烧结是有效的。还原后的钛的粒度为1~10，与过量的CaH_2混合还原，可脱除700ppm以下的氧，接近钙的脱氧极限。
Synopsis : According to the measurements of equilibrium oxygen concentration in Ti under Ca-CaO co-existence, the deoxidation limit is 500 ppm at 1 273 K. On the basis of these data, preparation of Ti powders have been carried out by reduction of TiO2 using saturated Ca vapors, liquid Ca and CaH2 powders at 1 273 K and subsequent rinsing of CaO in the aqueous solution of HCl, CH3COOH or NH4Cl. The oxygen and calcium levels in the Ti powders reduced by the saturated Ca vapors and the liquid Ca were not below 2 000 and 1 000 ppm, respectively. This was attributed to the CaO which were confined inside the sintered Ti particles and could not be exposed to the rinsing solution. Reduction of the TiO2-CaO mixtures has led to the residual oxygen with the range of 1 000-2 000 ppm, thus the presence of CaO in the starting oxide was effective to control the sintering between reduced Ti powders. The particle size of the reduced Ti was 1-10 Reduction of TiO2 by mixing with excess amount of CaH2 powders could eliminate oxygen below 700 ppm which is close to the deoxidation limit for Ti by Ca of activity of unity.