COMBAT D751 Industrial Grade Chelating Resin for Metals Removal

Description

Combat D751 is an iminodiacetic acid chelating cation exchange resin with high selectivity for calcium, magnesium and strontium in chloralkali brines. Combat D751 also exhibits high selectivity for heavy metal cations over alkali metal ions found in various process and waste streams. Selectivity is achieved by the iminodiacetic acid functionality chemically bound to a macroreticular resin matrix. Because of the high preference of Combat D751 for metals and excellent kinetic performance, this resin can remove metals from solutions even in the presence of high concentrations of sodium or calcium salts, with very low metal leakage. The macroreticular structure of Combat D751 is highly resistant to osmotic shock and has excellent physical stability. The typical properties of Combat D751 are shown below.

Typical Properties

These properties are typical but do not constitute specifications.

[1] Contractual value test methods are available on request

Suggested Operating Conditions

* 1 BV (Bed Volume) = 1 m3 solution per m3 of resin

Selectivity

The apparent selectivity of any ion exchange resin for a given metal depends upon concentration, the presence of other species and pH. This makes absolute selectivities very difficult to determine, especially for waste treatment applications. Because of this, laboratory testing is essential when a resin is required to remove one or more types of metal ions selectively. In general, the selectivity follows the following order:

Na⁺<^{2+2+2+2+2+2+2+2+ 2+2+3+}

The affinity for H+ at pH 4 is situated between Pb2+ and Cu2+. Consequently, for the metals with selectivities less than Cu²⁺, the resin should be in the salt form (for example in the Na⁺ form) to minimize metal leakage. At a pH of 2, the resin will be extensively in the H+ form and will only efficiently remove Fe3+, Cu²⁺ and Hg²⁺. 

Applications

Combat D751 is used in the following special applications:

z Purification of brine in the chloralkali industry

z Electronics industry (printed wiring boards)

z Purification of process streams containing trace metals

z Electroplating industry

z Recovery of heavy metals from hydrometallurgical leach streams

Limits of Use

Combat D751 is suitable for industrial uses. For specific applications such as pharmaceutical, food processing or potable water applications, it is recommended that all potential users seek advice from Combat-Tech in order to determine the best resin choice and optimum operating conditions.

All our products are produced in ISO 9002 certified manufacturing facilities.