Production of ferrous powder by oxidative roast of copperas, a byproduct of titanium pigment was introduced, and optimum process for the transformation of sulfur to sulfur trioxide was studied.
2
白粉墙村灯班第三、四两代花灯传人迥然不同的经济现状，提醒我们这个变化的实际开始。
The thoroughly different current economic situations of the third and the fourth generation of Festival Lantern successors in Baifenqiang Village remind us that the change is already beginning.
3
钛白粉作为白色颜料和填料已成为世界上第三大无机化工产品，仅次于合成氨和磷酸。
Titanium dioxide pigment white, used as coatings, fillers for plastic and paper, has been the third most important raw material in chemical industry, following ammonia and phosphoric acid.
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