Research On Flotation Of Iron Ore In Donganshan Area In New Cationic Collector System

The lack of iron resources in China has become an urgent problem after years of mining, which requires raising the level of comprehensive utilization of iron ore. At this stage, only depending on the conventional separation process has been difficult to meet the requirements of smelting and flotation is becoming more and more important in the beneficiation of iron ore. Reagents are key factors in flotation and determine the effect of flotation. However, the requirement of higher pulp temperature to maintain the activity of fatty acid anionic collectors, which have been widely applied in technological process of iron ores reverse flotation, led to a great deal of energy consumption and result in a greater impact on the environment. Therefore, application of a new type of collector at room temperature could make a great significant difference.The components and characteristics of mixed concentrate of magnetic separation from Donganshan sintering plant are studied by using X-Ray Fluorescence (XRF), X-Ray Diffraction (XRD), chemical and iron phase analyses, particle size distribution and TFe content of all grain levels. Results of the analysis show that useful element was iron, while the main impurity elements is silicon. Through the analyses, it is found that main iron minerals are hematite, limonite, magnetite, andsiderite, while quartz is the essential gangue minerals in ores. The particle size distribution tests of magnetic concentrate, about 93.58% Fe occur in finely disseminated ores which the yield accounted for 85.14% when the grain diameters were under 0.038mm. Based on known results of the mixed concentrate of magnetic separation on Donganshan sintering plan, the synthesis and optimization of a new type of cationic collector DYP is realized. Moreover, tests of single mineral flotation, mixed minerals flotation, actual ores flotation, open-circuit and closed-circuit flotation were carried out to detect the performance of DYP type collector.Test results of single minerals flotation show that the floatability of this three minerals in the flotation system of DYP as follow:quartz, hematite, magnetite. When the dosage of the carboxymethyl starch is 10.00 mg/L, the recovery of quartz had no effect, but the recovery of the hematite and magnetite decreased 46.66% and 31.67%. It proved that the carboxymethyl starch can selectively inhibit hemitate and magnetite, achieve successful separation under certain conditions of the certain amount of the inhibitor.The tests of artificial mixed minerals show that through conditions of pulp pH 6.96> dosage of DYP is 40.00mg/L、the dosage of inhibitor is 10mg/l, we obtain the concentration grade is 67.02%, the recovery is 81.27%, at 25℃.The results show that the DYP collector has a good collecting performance with quartz, the reagent system is simple and it can separate the useful minerals and quartz under the reasonable conditions, with good separation performance.The tests of mixed magnetic concentrate show that through conditions of pulp pH 7.56, the temperature is 25 ℃、the pulp density is 37.5%、the stirring speed is 1992r/min, the dosage of inhibitor is 1400g/t、the dosage of DYP is 180g/t in the rougher flotation and 30g/t in chosen flotation, the dosage of collector and inhibitor are 100g/t and 30g/t in the first sweep election, conduct a rough, a fine, three sweep open-circuit flotation experiment, and closed-circuit flotation experiment. The result of open-circuit flotation experiment obtained the concentration grade is 64.89%, the recovery is 40.86%.The result of closed-circuit flotation experiment obtained the concentration grade is 65.31%,the recovery is 79.24%.By means of modern detecting technology such as Fourier transform infrared spectroscope and ξ-potential measurement, combining the basic theories of flotation solution chemistry, surface chemistry and crystal chemistry etc., the absorption type between mineral and collector has been analyzed. The adsorption of DYP collector in the surface is mainly physical and hydrogen bonding. The adsorption of carboxymenthyl starch with the mineral mainly is the hydrogen bonding, the supplemented is chemisorptions.The experimental show that the new cationic collector DYP of ether amines has a better collecting and strong sorting capability on Donganshan iron ore, not only a simple reagent system, and can get better iron concentrate and recovery targets at room temperature.