钛:元素符号Ti,原子序数22,原子量47．88,在元素周期表中位于第4周期ⅣB族。钛是地壳中分布最广和丰度最高(6320×10~(-6))的元素之一,占地壳重量的0．61%,列居第9位;而钛资源则仅次于铁、铝、镁而列居第4位,是制取钛渣、人造金红石、钛白、海绵钛、钛金属及钛材、焊条涂料的重要原料。由于金属钛呈银白色,具有熔点高(1727℃)、比重轻(4．5)、机械强度高(5)、耐低温 Titanium: The elemental symbol Ti, atomic number 22, atomic weight 47.88, is located in the fourth cycle group IVB in the periodic table. Titanium is one of the most widely distributed and abundant (6320 × 10 -6) elements in the earth’s crust, accounting for 0.61% of the total crust weight, ranking the 9th. Titanium is second only to iron, Aluminum, magnesium and ranked No. 4, is the preparation of titanium slag, synthetic rutile, titanium dioxide, titanium sponge, titanium and titanium, welding rod coating an important raw material. As the titanium metal is silver white, with high melting point (1727 ℃), light weight (4.5), high mechanical strength (5), low temperature