ソーダスラグからの Na_2CO_3 回収についての基礎的研究

概要

論文の詳細を見る
Chemical reactions for the recovery of Na_2CO_3 from the slag obtained in the refining of hot metal with Na_2CO_3 were studied. The process for the Na_2CO_3 recovery consisted of three main unit operations. 1) Dissolving of the slag in the circulating aqueous solution. 2) Removal of residue and impurities (Si, P) from the solution. 3) Recovery of Na_2CO_3 from the solution. More than 90% of Na, P, V and 40 to 50% of S, Si contained in the slag dissolved in the solution and main ion species in the solution were proved as Na^+, V^<5+>, OH^-, CO^<2->_3, SiO^<2->_3, PO^<3->_4, S^<2->, S_2O^<2->_3 and SO^<2->_4. With the addition of CO_2, OH^-/CO^<2->_3 ratio in the solution turned to nil and Si concentration in the solution reduced to 2 g/l because of hydrolysis of SiO^<2->_3 ion. Addition of Ca(OH)_2 in the solution caused reduction of P concentration to less than 3 g/l, due to the formation of Ca_3(PO_4)_2. Removal of V and S ion were also studied. From these experiments, a process-flow for the Na_2CO_3 recovery from the slag was proposed.
社団法人日本鉄鋼協会の論文
1983-06-01