公开(公告)号：US11292718B2

公开(公告)日：2022-04-05

申请号：US16618937

申请日：2018-12-27

Applicant: SHANDONG UNIVERSITY

Inventor： Chunyuan Ma ,  Xiao Xia ,  Lin Cui ,  Liqiang Zhang ,  Xiqiang Zhao ,  Jun Li ,  Tai Feng ,  Shizhen Zhang

IPC: B01D1/28 ,  B01D39/12 ,  B01D39/20 ,  B01D53/50 ,  B01D53/56 ,  B01D53/80 ,  B03C3/16 ,  C01B17/04 ,  C01B17/05

Abstract: The present invention discloses a process for preparing sulfur from reduction of sulfate/nitrate by iron-carbon and recovering desulfurization/denitration agents. High-concentration SO2 flue gas produced by calcination of a sulfate and NOx produced by heating decomposition of a nitrate can be directly reduced to elemental sulfur vapor and N2 through reaction with an iron-carbon material at a high temperature. Then, after dust removal, cooling and fine dust removal, sulfur is recovered by a sulfur recovery device, and metal oxides can replace alkaline mineral resources such as limestone as raw materials of desulfurization (denitration) agents. This process can recycle the desulfurization and denitration agents.

公开(公告)号：US11286162B2

公开(公告)日：2022-03-29

申请号：US16613840

申请日：2018-08-31

Applicant: SHANDONG UNIVERSITY

Inventor： Chunyuan Ma ,  Xiao Xia ,  Xiqiang Zhao ,  Tai Feng ,  Jun Li ,  Shizhen Zhang

IPC: C01B17/04 ,  B01D53/50 ,  B01D53/83 ,  B01D53/96 ,  C22B15/00

Abstract: A system and method for recovering sulfur in a copper smelting process includes removing fine dust from high-concentration SO2 flue gas from a matte smelting furnace, introducing the flue gas into a fluidized bed carbothermic reduction tower to be reduced by a carbon-based reducing agent to obtain reducing gas, passing the reducing gas through a high temperature separator to separate down unsaturated powder coke contained in the reducing gas, and condensing the reducing gas to obtain sulfur. The saturated powder coke entrained in the reducing gas enters a desorption tower to desorb SO2 gas therein, and the desorbed powder coke enters a fluidized bed sulfur reduction tower to continue to participate in the reduction reaction. Part of the SO2 gas discharged from the desorption tower is discharged to the fluidized bed carbothermic reduction tower to produce sulfur, and the other part enters a desulfurization tower.