The scheelite is often associated with sulfide ores such as copper-lead-zinc ore and calcium-containing gangue minerals such as calcite and fluorite. At present, it is common to separate the sulphide ores and then scheelite.

Tungsten carbide (WC) is a black six party crystal with metallic luster and hardness similar to diamond. It is an important cemented carbide material. In the new field of science and technology, tungsten carbide has the catalytic effect of platinum like (Pt).

Heterojunctions have become an essential element of the modern semiconductor industry, and they play an important role in high-speed electronic devices and optoelectronic devices. Two-dimensional layered materials, including graphene and transition metal disulfide, can serve as a constituent unit of a heterostructure due to their unique electrical and optical properties.

Electrochromism refers to the phenomenon that displayed by some materials of reversibly changing color under the action of an applied electric field. Electrochromic device only needs a small voltage (about 2V) to work, and the original color or fading state can be maintained in the open circuit, so the energy consumption is less.

Industrial wastes containing heavy metals such as copper, nickel, cobalt, manganese, tungsten, and other heavy metals are treated by proper methods, and the valuable components of the industrial waste can be recycled, the harmless and resource utilization of industrial waste can be realized. At present, the method of metal recycling for such industrial wastes is usually used by alkali leaching, using sodium hydroxide or sodium carbonate as leach agents. The tungsten is leached under normal pressure or pressure condition, and tungsten is separated from other metals, and the tungstate solution is obtained by ion exchange and enrichment in the next step, the alkali leaching residue is then soaked in acid. Removal of impurities, separation and purification of copper, nickel, cobalt and manganese products.

In modern industrial production, ultrafiltration membrane is a commonly used filter product. Membrane separation technology is a new and efficient separation technology. It can meet the needs of modern industrial energy saving, improving production efficiency, reusing raw materials and eliminating environmental pollution.

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