Abstract
Recovery of Na2CO3 from the sodium containing slag was studied. The experimental plant process consisted of several unit operations, such as dissolving of the slag in the aqueous solution, removal of Si and P from the solution, separation of the precipitate and the residue from the solution, crystallizing of Na2CO3 hydrate from the solution and drying the Na2CO3 hydrate. The plant could process the slag and produce Na2CO3 at the rate of 120 kg/h and80 kg/h, respectively. The slag obtained in the continuous refining of hot metal with Na2CO3 was used as the raw material. By examining for more than ten days, the following results were obtained. 1) Small particles (1.3mm dia.) of Na2CO3were obtained and the yield was 82.5%. The contents of impurites (P, Si, and S) in the recovered Na2CO3 were lower than the ranges which were unfavarable for the refining of hot metal. 2) The plant was operated without difficulties and treatment of the byproducts such as insoluble material and precipitate of dephosphorization presented no problem.
