Title:
【発明の名称】低濃度廃硫酸の再生利用方法
Document Type and Number:
Japanese Patent JP2569197
Kind Code:
B2
Abstract:
The approximately 23% strength waste sulphuric acid (DS) produced in the digestion of titanium raw materials is concentrated to about 70% by weight (CS) and is subjected together with precipitated metal salts completely or at least to a large extent to roasting (R). While the metal oxides (MeO) formed are deposited, the sulphur oxide gases produced are reacted with water to give highly concentrated, for example 98% strength, sulphuric acid (HCS), which is recycled into the digestion of titanium raw materials. Since the proportion of recycled metal compounds is substantially reduced in recirculation, a titanium dioxide pigment of higher quality can be produced with less complicated equipment and less energy.
Inventors:
Joseph Mauer
Palmanant Bangsal
Palmanant Bangsal
Application Number:
JP9050190A
Publication Date:
January 08, 1997
Filing Date:
April 06, 1990
Export Citation:
Assignee:
Sulzer-Esher Vis Age
International Classes:
C01B17/50; C01B17/90; C22B34/12; (IPC1-7): C01B17/90; C01B17/50
Domestic Patent References:
| JP49196A | ||||
| JP4027725B1 |
Attorney, Agent or Firm:
Mitsuteru Soga (4 outside)