Found outside Baghdad, Iraq in 1936, the Baghdad Battery is a small clay jar containing an iron rod suspended in a copper cylinder which is soldered shut and sealed with asphalt.

We have rivet nuts of more than 400 kinds, including cylinder, hexagon, open end, close end, carbon steel, stainless steel, copper, etc.

The paper introduces briefly the retrofit of the cleaning equipment and the operating results of the cylinder type bag filter in the fluidization systems for the copper smelting flash furnace.