40results about How to "Act as a reducing agent" patented technology

The invention discloses a reduction method based on a reduction pretreatment process and used for the iron oxide scale of hot-rolled strip steel. The reduction method comprises the following steps: rapidly heating the hot-rolled strip steel to 400-550 DEG C at a speed of 80-150 DEG C / s; carrying out isothermal reduction for 30-600s, wherein the reduction product is multigap sponge iron; after intermediate cooling, heating to 700-1100 DEG C at a speed of 80-150 DEG C / s; and carrying out isothermal reduction for 30-600s, wherein iron particles in the multigap sponge iron are mutually bound, thecrystal grains grow, the gaps, air holes and crystal boundaries in the reduction product are gradually reduced through material transfer, the total volume is reduced, a compact multi-crystal pure ironlayer with a microstructure is formed, and reduction for the iron oxide scale is completed. The reduction method is capable of remarkably increasing the reduction efficiency for the iron oxide scaleof the hot-rolled strip steel in a continuous annealing furnace, and capable of obtaining lots of reduced pure iron in a short reduction time, so that the influence of the residual of the iron oxide scale on the formability and adhesivity of the subsequent plated layer is avoided, and then the industrial promotion of a pickling-free reduction annealing hot-galvanizing prototype technology is ensured.

The invention relates to a blister copper blowing process in the technical field of blister copper smelting, which comprises mixing copper-containing waste and copper-containing waste treatment tailings, adding them to a side-blowing melting and incinerator, and adding a cosolvent, a reducing agent, and a fuel, At the same time, oxygen is blown in, and mixed blowing is carried out at 1200-1250°C; finally, blowing tailings, blister copper and flue gas are discharged separately, and the flue gas is discharged after treatment. Limestone has a low melting point, which can promote the melting of quartz stone and iron oxide and improve fluidity. Iron, molybdenum, magnesium, calcium, silicon, etc. in the furnace charge are oxidized in an oxygen-rich environment to form oxides, which combine with quartz stone to form tailings, and realize the separation of non-copper metal elements from copper. Iron oxide can convert copper oxide and copper in copper sulfide Reduction, increase copper content, semi-coke as fuel, high fixed carbon, sufficient energy for combustion, high chemical activity, and can also function as a reducing agent; the combination of these can increase the reduction rate of copper.