硫酸法金红石型二氧化钛用无机盐类进行表面处理后，形成疏松多孔的海绵状包膜，提高了它在平光乳胶漆膜中的干遮盖力。

The rutile TiO_2(sulfate process) was treated with inorganic salts to form a porous coated film that increases its dry hiding power in matt emulsion coating films.

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This is titanium sponge that comes out of the bottom of this reactor, and it subsequently re-melted in a vacuum arc furnace.

海绵状的钛,从反应器的底部出来，随后在真空炉中重新熔炼。

麻省理工公开课 - 固态化学导论课程节选