REMOTOX® is a strong, yet relatively inexpensive precipitant for removing a wide range of heavy metals.
Many industries, including metal finishing, printed circuit board manufacturing, pulp and paper, food processing, and mining produce wastewater streams containing significant amounts of metals.
REMOTOX® is commonly used for efficient and practical removal of heavy metal ions and other organic compounds from various wastewater sources.
When mixed with water, REMOTOX® decomposes to form bisulfide, aqueous hydrogen sulfide and other sulfur compounds. Most heavy metal ions are precipitated as metal sulfides by these breakdown products. See Calcium Polysulfide Chemical Reactions. Metal sulfides are much less soluble than metal hydroxides. Metal hydroxides change solubility with changes in pH. Metal sulfides remain insoluble within a wide pH range. In the case of chromium, REMOTOX® reduces hexavalent chromium to trivalent state which then precipitates as chromium hydroxide in a one-step reaction; therefore, no need for bisulfite, metabisulfite, sulfur dioxide or sulfuric acid.
While effective treatment can be achieved over a wide pH range, best results are typically obtained within water system pH 7-10. See pH Guidelines for Treatment of Soluble Metal Streams. Ensuring adequate contact time and thorough mixing is critical to successful treatment. Dewatering the resulting precipitate can be expedited by employing an anionic flocculant.
REMOTOX® is a calcium polysulfide liquid solution consisting of multiple sulfur anions that strongly bond to heavy metals in water.