| In recent decades, China has accelerated the process of industrial construction, along with the rapid development of the steel industry, and therefore the demand for iron ore rose year by year. The iron ore is the main raw material of the steel industry and it is a very important resource of the country. Nearly2billion tons of high phosphorus iron ore reserves in yunnan province in China, but have not been able to get good development and utilization, in order to stability and sustainable development of iron and steel industry in our country, the comprehensive development and make good use of high-phosphorus iron ore resources, with existing resources advanced technology to economic development, which will be the effective use of our resources and play a vital role in the national economic construction.Huimin iron ore in Yunnan Province has a rich reserve, easy to exploit, but due to the low grade ore, fine grain size, the complex composition and high phosphorus content, so that it is very difficult to choose, for a long time there has been no exploitation and utilization.In this paper, through the use of multi-element analysis, X-ray diffraction, precision impedance analysis, scanning electron microscopy and electron spectroscopy and other comprehensive measures to study the characteristics of Yunnan process mineralogy of iron ore. Obtained the chemical composition of the iron ore, mineral composition and some important physical parameters provides a theoretical and practical basis for the rational development and utilization of the iron ore. And analyzed the reasons for this Yunnan Huimin high phosphorus iron ore that using a common processing methods can not get to the good results seen its ore, iron ore scanning electron microscopy and X-ray analysis (SEM-EDX) Figure showed that the phosphorus content is high, in the element composed of randomly selected points in the phosphorus content is1.42%,0.91%,0.52%,0.64%,0.73%,0.35%respectively, iron content:40.06%,62.61%,15.72%,51.50%,65.25%,72.32%respectively.As can be seen from the ore surface maps of Al and Fe element distribution in the region as a whole, but mainly concentrated in the SEM image of the white areas, white areas of high Fe content Al element distribution pattern is not obvious, the entire region containing Si element distribution law, mostly in the SEM image(Fig2.5) of a gray area, the distribution of phosphorus in the iron ore is very unsatisfactory, almost distributed throughout the region, there is no regularity at all, the degree of concentration is very low, the Ministry of phosphorus embedded in the edge of the particles of iron oxide minerals, or carbonate minerals, the main crystal acicular or loose granular distribution of iron minerals and gangue minerals, fine-grained, very difficult to separate to the beneficiation drop phosphorus bring difficult, and this is the iron ore has been difficult to develop the use of the main reasons.This study also uses oxygen-enriched top-blown smelting reduction techniques to deal with Yunnan Huimin high phosphorus iron ore, explores an important factor to affect the smelting effect (smelting temperature, alkalinity, Moore rate, oxygen-enriched content and time), and eventually get the experimental studies smelting conditions that is temperature of the experiment:1400-1500℃, alkalinity:1.3,moore rate:1.0, the time:30minutes, oxygen-enriched content of about90%, obtained the phosphorus content is preferably0.2%in pig iron. This paper also studied the phosphorus behavior of the smelting process.The results showed that phosphorus in addition to the most disseminated distribution of phosphorus iron, phosphorus is the form of aluminum phosphate and magnesium phosphate exist in Huimin iron ore, after smelting, phosphorus is the form of AlPO4and Mg3(PO4)2and Ca3(PO4)2exist in the samples.at the same time, a small part of phosphorus and phosphorus-containing substances by flue gas discharge in the smelting process. |
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