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Ferrous sulfate solution to remove the cyanide

The presence of alkaline solution,[link widoczny dla zalogowanych], sediment may contain a small amount of precipitation of soluble Prussian blue, which can be under these conditions Na slightly higher sediment components to prove it. \ Mouth JIO Fu tgx-'Head 7 contacts with different p solution Po 2 hours Houpulushi infrared spectra of the blue precipitate Huan Lu B ± blue police in the Shen sly bit solution with different pH 2 hours after exposure to meta-analysis of sediments capsule 10. 00330.716.58.82.440.00633.314.59.33.260.01634.614.56.04. M. 170.63Z. 59.47.26.180.684,9.38.93.611722.290.153.54. i2.817.3n0.5253.14.93.3 ¨. 91 workers 0.3056.15.82.818.4l30.1862.8L00.326.6t1.8Fel 【Fe (CN) 6jB - 045.525.229.30-NaFe [Fe (CN) e] - 7 .938.42 '. 8Z8.90-F: Os - 069.90043.0-Fe (OH) la 06Z. 10035.6-PeO ・ 0H} a 062.10018.0 a natural solution after precipitation pH-l | --- with a different solution 2 hours after exposure to infrared spectra of the precipitate shown in Figure 7. pH 6 and less than 6 contacts precipitate the solution is not changed substantially. And pH 6 to 9 of the solution in contact with the sediment to maintain a strong CmN 2084cm wavelength extension, however, in 1140,1056 and 996cm the three characteristics of bands began to disappear. At pH 10 and 13:00, 2084cm bands began to disappear,[link widoczny dla zalogowanych], Prussian blue started to decompose. At high pH, the appearance of other bands may be due to Fe: O ・ nHO due to the different forms. Sediment under different pH x-ray diffraction patterns of a comparison is shown in Figure 8. And the pH value of 1 to 8 of the solution contact with the sediments show only the FeEFe (CN) e). The x-ray diffraction (XRD) characteristics of bee value. At high pH values,[link widoczny dla zalogowanych], these peaks decrease in intensity, which is due to the strong Y-FeOa the sake of change on the increase. x of a ray diffraction (XRD) 』Fcl0% ∞ 57545I'34. 3530 Figure 8 Xi Lu ± blue precipitate in the solution with different pH until 2 hours after exposure to x- ray diffraction pattern of a technique sensitive only to the crystalline compounds,[link widoczny dla zalogowanych], which means not detected in the IR spectrum instantaneous form of FeO. ・ NHzO may be non-crystalline form of the. Conclusion The environmental requirements of all cyanide solution should be reduced to a prescribed level, not the solid cyanide. Therefore, the method must be optimized to form ferrous sulfate precipitate of Prussian blue, rather than generate soluble ferrous cyanide complex. And FeSO by Prussian blue reaction of cyanide in the best conditions to remove the following; pH5 .5 to 6.5FeICN than 0.5 drum into the oxygen or ammonia are harmful to the removal of cyanide oxidation result t of oxygen in the solution generated in the ferrous cyanide and iron cyanide | ammonia solution led to the formation of ferrous cyanide. Ferrous cyanide ion is unstable in acidic solution, not the formation of five-iron cyanide complex ion Fe (CN) ・ H. O, is the rapid oxidation of iron cyanide Fe (CN): one. In the pH value is less than 4 of these reactions occur. CN in excess of a reaction of FeSO and sediment generated mainly insoluble Prussian blue, FeEFe (CN)..). Prussian blue precipitate in the range pH1 ~ 7 is stable, but in alkaline solution is unstable, decomposing rapidly in alkaline solution into Fe (CN) l entered the solution. At pH greater than 7, it produces a variety of insoluble iron oxides Fe2O. ・ NH2O (n = 1 ~ 3). References (omitted) (Dian Ming Shan female in transition) ■ Published : Head, Ore Dressing BU disc a \ 1 switch B4 ¨, 6416, IL Salt: M16 Wong Biography: 2225B9BGRIMMCN Organizer: JI: Beijing General Research Mining Ba ■ India: India ● Beijing ■ ■ plant per square total circulation: Nang pro- press re-earners ■ Order: base re-Lu to subordinates Uruguay ■ ad business license to fly holding manganese: West Beijing Youth workers set B,[link widoczny dla zalogowanych], Pan 0, ostrich turned No. unified cN {1-18.2 ~ 2 \ ∞ din ■ I - \ ~
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