Research And Development Of Beneficiation Process Of High - Iron Fine - Grained Copper Oxide

The paper mainly introduces the enrichment of oxidized copper ore, characterized by high content of iron ores and fine dissemination, thereinto, the two respectable gangues are iron mineral and silicon-containing mineral in the run-of-mine with a trace of calcium-magnesium-aluminium gangue, on the contrary, the vast majority of gangues in the regular oxidized copper ore contain calcium and magnesium, and hence it can provide a clue for processing this type of oxidized copper ore.According to the assay of mineralogy research, the results show that:the ore contains1.08%Cu and the oxidation rate of this ore is up to60.92%, the bound-type oxidized copper is low, only accounting for4.44%. The oxidized copper ores are mainly presented in the form of malachite and azurite, copper sulfide ores are mainly presented in the form of chalcocite, copper blue and bornite, the content reaches to38.89%. Another remarkable characteristic is that the iron content is high, accounting for54.17%, but the content of magnetic iron is poor, part of iron exists in red limonite, and the flotation pulp is scarlet. The main gangue mineral is silicon, with a trace of calcium, magnesium and aluminum. The apparent characteristic of ore is dense block and hard texture, but crisp and crisp. The useful minerals of copper and iron crystallization are in fine grain, and the relationship is complex.The focus of the thesis is to solving the problem of the ore resource utilization, the difficulty is recycling of oxidized copper ore, attributed to the following factors: First, it contains vast iron minerals in the run-of-mine, which have an adverse impact on the separation, especially, hematite and limonite, grinding is easy to slime. Second, high oxidation rate, fine dissemination, and the realationship is complex. Thrid, existence of bound-type oxidized copper minerals, although the content is low, but poor recyclability. At last, there is difficulty in grindability for different copper minerals, it is noticeable, due to the existence of38.89%of secondary sulphide copper minerals, which is easily over crushed in the mill.Experiments were conduct based on sulfide minerals flotation, and results of both selective flotation and mixed flotation showed that copper sulfide can be flotated easily, oxidized copper minerals are recoverable. It was convinced that preferential flotation has a better performance than mixed flotation in the enrichment of oxidized copper minerals, comparison to mixed flotation, the negativity of preferential flotation is that the flowsheet is complex. Therefore, mixed flotation was regarded as a reference to conduct exploration tests in the follow-up studies.Depended on a series of tests, it showed that fine-grinding is an indispensable part of the procedure, because copper and iron crystallization are in fine grain. Soda as regulator plays an important role in the improvement of the recovery of Cu, and sodium silicate has an extent impact on it. At last, sodium carbonate and sodium silicate are recommended as the regulators. Actviator tests are show that sodium sulfide can greatly improve the recovery rate of copper mineral, ethylenediamine phosphate combined sodium sulfide have an assistant effect on improving the indexes of concentrate, ammonium salt combined sodium sulfide or ethylenediamine phosphate and sodium sulfide have implicit in activating the ore. Finally, ethylenediamine phosphate and sodium suilfide are recommended as the activator. Butyl xanthate is recommended as collector by test. Both mixtures of regulators soda and sodium silicate and activators ethylenediamine phosphate and sodium sulfide have an good impact on the cleaning, furthermore, secondary sulphide copper minerals are in favor of decrease of reagents, good quality minerals can be floated easily, and beneficial to the entrainment of refractory minerals.Through these researches, eventually the closed-circuit flowsheet was determined, including three roughing, one scavenging and three cleaning, besides, it had the middlings return orderly. Some parameters were determined by relative tests, the grinding fineness-200mesh accounted for90%and-400mesh accounted for69%, reagents including soda and sodium silicate utilized as regulator, with a dosage of1410g/t,940g/t respectively, sodium sulfide and ethylenediamine phosphate as activator with a usage amount of2600g/t,106g/t, butyl xanthate as collector with a dosage of260g/t, the usage of frother terpenic oil110g/t, when the raw ore contains Cu1.14%, copper concentrate containing22.92%Cu at a copper recovery of83.83% can be obtained. And then the tailing from flotation closed circuit was processed by high gradient separation including one roughing and one scavenging, eventually the two concentrates of roughing and scavenging were mixed, to produce a high quality iron concentrate containing61.60%Fe at a iron recovery of89.48%.