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For the problems of the collophane backwater in the production process, experimental study on the phosphate backwater in Yunnan has been carried. It examined the effect of main ions on the flotation backwater. It found that it will deteriorate collophane flotation index when the content of Ca, Mg, SO4, PO4 too high. In response to this phenomenon, it proposed the wastewater treatment process of phosphate beneficiation. Introduction Backwater using is an important link in the collophane flotation. Due to the complex properties and the extensive use of the flotation agents, this makes the complex composition and more toxic and harmful ingredients in the wastewater of phosphate beneficiation. If it directs emissions, not only pollute the environment, but also waste of water resources. But if it directly to recycling without treatment, it will worsen the sorting index by the organic and inorganic agents, suspended solids and inevitably ions, etc. present the waste water. It shows that the ions which impact the positive flotation were mainly calcium ions, magnesium ions, phosphate ions and sulfate ions, followed by silicate ions and fatty acids ions. It will not be affected by calcium ions, magnesium ions and phosphate ions to anti-flotation. There are a lot of unavoidable ions in the pulp by the minerals dissolved in the process of the phosphate sorting. Some unavoidable ions adsorbed on mineral surfaces so that change the properties of the mineral surface. It reduces the floatability difference between the objective minerals and gangue minerals. It also can worsen the pulp environmental and consume large amounts of anionic collector, so that reduce flotation index. Run-of-mine ore properties We have researched on the run-of-mine ore. The analytic results of multi-element are shown in Table 1. Table 1 Results of multi-element analysis Element P2O5 MgO CaO SiO2 Al2O3 F Content/% 21.98 1.54 32.75 31.34 1.61 1.04 Element Fe2O3 CO2 A.I Else K2O Na2O Content/% 1.33 4.81 38.60 0.94 0.36 0.18 The results of the multi-element analysis from table 1 show that the mainly useful minerals are collophane and the mainly gangue minerals are quartz, calcite and dolomite. This kind ore mainly present in irregular granular disseminated. It is cemented symbiosis between collophane and gangue minerals. International Conference on Materials, Environmental and Biological Engineering (MEBE 2015) © 2015. The authors Published by Atlantis Press 475 Beneficiation wastewater ions source It is generally been divided into kinds about the collophane beneficiation waste water. One is from concentration, which always been acidic. The other is the tailings waste water, which always close to neutral. The mainly ions which depress the phosphate direct flotation in the wastewater as follows: 1) Ca and Mg. It mainly from the dissolution of dolomite and calcite minerals, the excess lime which treatment the wastewater, phosphate and carbonate which been decomposition by the addition of concentrated sulfuric acid in the reverse flotation processes. 2) PO4. It mainly comes from the industrial phosphoric acid. And a small amount are from the phosphate ore which been decomposition by the addition of concentrated sulfuric acid in the reverse flotation process. 3) SO4. It mainly comes from the addition of flotation reagents sulfuric acid. Water treatment process After comparing a variety of methods, it determines using the process of "dual-alkali" + PAM coagulation treatment backwater. The test process shows in Figure 1.

Research on Collophane and Ions of Backwater in Yunnan