DF-640
重金属沉淀剂
DF-640 是二甲基二硫代氨基甲酸钠 ((CH3)2NCS2Na) 水溶液的专有混合物。
它可以有效地从工业废水中沉淀出低浓度的金属离子。
推荐使用 DF-640 作为处理含有 1 至 500 ppm 总金属离子的废水的化学品。还应考虑对具有任何金属浓度的精矿进行批处理。
根据具体应用，DF-640 可以将金属去除至 0.1 ppm 以下。即使在含有络合或螯合铜的溶液中，DF-640 也能极其有效地沉淀铜。它还对其他金属有效，包括镉、铬 (+3)、金、铁、镁、汞、镍、银和锌。DF-640 对去除铝、铬 (+6) 和钼无效。
沉淀反应为： 2[(CH 3 ) 2 NCS 2 -Na + ]+ M +2 ------> 2[(CH 3 ) 2 NCS 2- ]M +2 + 2Na +
应用
所需的 DF-640 量因每种金属和每种废物流而异。对于含有混合金属的溶液，必须为每种金属添加 DF-640 剂量。DF-640 在很宽的 pH 范围内（4.0 到 11.0）都有效。建议进行实验室评估以确定使用 DF-640 的最佳条件。Duraflow LLC 将很乐意提供现场技术支持以协助可处理性研究。
好处
- 沉淀低浓度的金属离子
- 高效沉淀铜
物理数据（典型）
外观：黄绿色至琥珀色液体
密度：9.6 lbs/gal
pH：11.8
水中溶解度：完全
蒸气压：13 mm Hg @ 25CC
冰点：20°F
闪点：> 200F
粘度：23 cps @ 72°F
DF-640
Heavy Metal Precipitant
DF-640 is a proprietary blend of an aqueous solution of sodium dimethyldithiocarbamate ((CH3)2NCS2Na).
It is effective in precipitating low concentrations of metal ions from industrial aqueous effluents.
DF-640 is recommended as a treatment chemical for effluents containing 1 to 500 ppm total metal ions. It should also be considered for batch treatment of concentrates with any metal concentration.
Depending on the specific application, DF-640 can remove the metals to below 0.1 ppm. DF-640 is extremely effective in precipitating copper even in solutions containing complexed or chelated copper. It is also effective on other metals including cadmium, chromium (+3), gold, iron, magnesium, mercury, nickel, silver and zinc. DF-640 is not effective for removal of aluminum, chrome(+6) and molybdenum.
The precipitation reaction is: 2[(CH3)2NCS2-Na+]+ M+2 ------> 2[(CH3)2NCS2-]M+2 + 2Na+
Applications
The amount of DF-640 that is needed varies for each metal and each waste stream. For solutions containing mixed metals, the DF-640 dosage must be added for each metal. DF-640 is effective over a wide pH range (4.0 to 11.0). Laboratory evaluation is recommended to determine the optimum condition for the use of the DF-640. Duraflow LLC will gladly provide onsite technical support to assist with the treatability study.
Benefits
- Precipitates low concentration of metal ions
- Highly effective in precipitating copper
Physical Data (Typical)
Appearance: Yellow-green to amber liquid
Density: 9.6 lbs/gal
pH: 11.8
Solubility in water: Complete
Vapor pressure: 13 mm Hg @ 25CC
Freeze point: 20°F
Flash point: > 200F
Viscosity: 23 cps @ 72°F
