Titanium dioxide (TiO₂) might have wider applications in our daily life than you think. It has been applied in daily products, such as paints, toothpaste, food additive, dyes, sun creams, varnishes, textiles, paper and plastics. Another important application of TiO₂ is as a semiconductor. It has the function to purify air, water and soil polluted with various hazardous chemicals.

It is found that tantalum (Ta) and niobium (Nb) in concentrate of wolframite ((Fe,Mn)WO4) has been wasted: some of it goes to the insoluble residue after ammonium-leaching of the tungstic acid slurry; most of it goes to the solution of ammonium tungstate when (Fe,Mn)WO4 concentrate was digested by hydrochloric acid and the slurry of tungstic acid obtained was leached in ammonia. When the ammonium paratungstate (APT) was crystallized from the solution of ammonium tungstate, Ta and No were almost completely left in the mother liquor and their content reached up to 16 g/litre.

Tungsten carbide cobalt (WC-CO) is an alloy of a hard ceramic phase, tungsten carbide (WC) and a ductile metallic phase, the cobalt (Co). Significant properties of WC-Co are hardness, strength, high breaking and beating ductility as well as high electrical and thermal conductivity. By varying the cobalt content between 0 and 20 mass per cent, hard metals can cover a hardness range from tempered steel to super-hard alloys. From hard metals, mainly tools are produced for chipping (turning, milling, drilling) or non-chipping shaping (drawing, rolling, spinning), as well as for cutting or breaking of metals, wood, stone, and ores. Applications of WC-Co in life include surgery equipment, nozzles or reinforcements, small balls in ball pens, hard metal driller, and hard metal coated circular saw blades.

Ammonium paratungstate (APT), as a significant starting material for tungsten, which can be derived into the majority of tungsten products. Wolframite or scheelite (CaWO₄) concentrates are the two common materials are APT. There are two important steps in production of metallic tungsten from APT. The first step is thermal reduction of APT powder by heating at 400–900 °C, which leads to ammonia and water elimination as well as the crystallization of tungsten trioxide (W0₃). In the second step, an even higher temperature is required. WO₃ powder was heated under H₂ at 600–1100 °C, and metallic tungsten is then prepared.