| 摘要 |
<p>PURPOSE: A byproduct collecting method is provided to prevent environmental pollution by collecting BaSO4(Barium Sulphate) from slag which is generated in a dephosphorization process and additionally collect byproducts such as CaCO3(Calcium Carbonate) from residue solution after collecting BaSO4. CONSTITUTION: A byproduct collecting method comprises the following steps: a step of eluting Ba which is contained in slag by soaking the slag into a solvent(S110); a step of separating a residue and solution from which Ba is eluted(S112); a step of injecting an additive which contains SO42- into the solution, reacting Ba2+ in the solution with SO42-, and producing BaSO4(S114); and a step of collecting BaSO4(S118). The slag is produced in the process of the dephosphorization of ferromanganese using the dephosphorization material which contains Ba. A process of crushing slag is prior to the process of soaking slag into the solvent. The solvent is water. The additive is one of H2SO4, a metal sulfide, and treated water of Sox gas and blast furnace slag. The molar concentration ratio of Ba2+ in the solution and SO42- in the additive is one or less. The collecting rate of Ba contained in slag is 10~100%. [Reference numerals] (S110) Eluting water-soluble Ba in slag; (S112) Separating the solution and the residue; (S113) Processing the residue; (S114) Injecting an additive which contains SO4^(2-) into the solution; (S116) Separating precipitates and the remaining solution; (S117) Processing the remaining solution; (S118) Collecting BaSO4</p> |
