usage:

1. in metallurgy industry: as precipitating and separating function for Rare-earth metal.

2.in light industry: polishing for marble, rust-remover, bleaching, dirt-remover, leather-processing, wood

3.in dyeing and printing industry: as reducing agent for dyeing and printing industry, as bleaching agent for textile, substitute for acetic acid, as coloring mordant for fast pigment dyestuff

4.in electron industry: preparation of chemicals raw material for porcelain capacitor, preparation of electron equipment detergent.

5.in other aspects: as analysis reagent, raw material of chemicals.