Tungstic acid is obtained by wet chemical methods from the flotation concentrate. Starting materials for the production of metallic tungsten powder are:

Ammonium paratungstate
Tungstic acid
Tungsten trioxide and
Tungsten blue oxide

These materials are reduced to tungsten powder in hydrogen at a temperature around 1000℃.

Following screening and homogenizing, the tungsten powder is pressed into rods, plates and shapes of different geometry and dimensions by conventional or isostatic pressing. The pressed compacts are then sintered in high purity hydrogen at temperatures of about 2500℃.

By forging, swaging or rolling at temperatures of 1500-1600℃, the sintered tungsten bars and blocks are heavily worked. With increasing degree of deformation, the working temperatures can be lowered. Forgings, rods, sheets of different thicknesses, ribbons, foils and wires are made in this manner.

Zhengzhou Sanhui Co., Ltd is one diversified company which deals with R&D, production and sale. Sanhui has passed the ISO9001:2000 quality control certificate since 2005. Sanhui provides products for customers in strict accordance with the requirements of international quality certification system. Our main products involve tungsten, molybdenum, nickel and other nonferrous metals and their alloy products. Sanhui has accumulated almost 25 years of production and export experience.

Welcome to visit us.