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,. <br /> <br />Even though the U.V. effect is generally considered to be negligible, by using <br />CyTox even this possibility is removed. In addition, this same soluble Fe is <br />removed, permanently from solution. <br />CyTox is used as a site specific chemical to precipitate a stable CN compound, <br />unaffected by pH changes. It does so by producing a compound of the type MZ <br />Fe(CN)8 and this is best explained by illustration with two hypothetical <br />examples. <br />Example 1. Where tailings contain free CN but no ionized metals (or virtually <br />none), one uses a high-zinc CyTox as follows: <br />6NaCN+3[(0.66~Zn.0.33~Fe)S0~.7Hz0)->ZnZFe(CN)e+3NaZSO4+21HZ0 <br />Example 2. Where tailings contain free CN and ionized metals, e. g. Zn, Cu., one <br />uses a low-zinc CyTox as follows: <br />6NaCN+1.4ZnZ*+O.SCuZ'+O.1FeZ*+(0.1Zn.0.9Fe)S0~.7HZ0-> <br />->1.5Zn.0.5Cu.Fe(CN)e+NaZS0~+4Na(OH)+7H2O+4H' <br />The above are perfect examples, but the principal is illustrat@d. <br />The stability of these MZFe(CN)e compounds (with the exception of M=Fe) are well <br />understood. However, a study of their stability was conducted at both Skyline <br />and Hazen laboratories under the direction of BEI. The products of reaction (the <br />"insoluble" compounds) of, <br />non-stoichionatric { <br />FeS0~.7Hz0+CN = FezFe(CN)e <br />(ZnFe)S0~.7HZ0+CN = ZnZFe(CN)8 <br />were themselves put into aqueous suspension at pH's 7,6,5 and 4 and their <br />dissolution rates measured. A simple summary is presented in Fig. 1, where it <br />can be seen that Fe2Fe(CN)e is unstable at the higher pH and ZnZFe(CN)e is <br />completely stable over the range of pH tested. <br />With this data in mind, it is the intent of Battle Mountain to eliminate its <br />free-CN problem at San Luis, CO. <br />3. Solution to Battle Mountain (San Luis) Problem <br />We at Battle Mountain approach the resolution of the free CN' problem as a 2- <br />stage process. <br />A. Stage 1. <br />At the moment free CN' exists in our ponds and is, obviously, continually <br />generated in our process. Our first step is to remove free CN' from our <br />ponds and omni-present tailings production by using high-levels of CyTox. <br />2 <br />