Common mixtures include sodium citrates, sodium borohydride (also used to bleach wood pulp) and ammonium compounds, all of which can be toxic to humans and the environment.
Sodium carbonate for example, is recovered from black liquor in soda pulp mills.
以碳酸钠微粒，是从纯碱纸浆厂的黑色液体中回收的。
3
The prospect of application for sodium molybdate, particularly the application in the corrosion inhibitor bleaching of chemical pulp and cleaning industry etc. were described briefly.