Among restored silica fume manufacturers, Swedish companies stay in the forefront. As early as 1911, Sweden began to use silicon ore and mixtures of coke and limestone for steelmaking in the ring kiln. This technology began to be applied in powder metallurgy and welding industry in 1936.

With the continuous improvement and expansion of silica fume, there are higher requirements for quality of restored silica fume. So metal powder supplier made the hydrogen secondary fine reduction treatment ...