Yunnan, A High Phosphorus Red Limonite Dressing Pilot Study

Along with our country steel industry developing rapidly, Steel yield of our country has exceeded more than 300,000,000 tons in 2005, become the first in the world, but the iron ore resources of our country is absent, the amount of imported iron ore reach to 275,000,000 tons in 2005, the amount which imported iron ore has already shared a half of our country's steel and iron plants needed; Our country has already become the biggest country exceeded Japan in importing iron ore in the world. With incresing the iron ore importing dependence, our country lost the word's power of international mineral price , have become a big hidden trouble of our steel industrial economy safety. Need to depend on technique progress, try our best to explore present iron mine resources, particularly, explore complications mine which separate diffcultly,we can't explore with current technique, increase repertory and increase efficency. Explore the potential production, raise the self-sufficient rate , alleviate pressure of importing iron ore, maintin stability, abundant quantity, superior quality of iron ore raw material's supplying , guarantee steel industry keep a stable development.At present, China have kept a lots of iron mine with more phosphor ,about share 14.86 percent of total amount of iron mine , haven't explored yet, so we need to study a technique which can decline phosphor containing in iron ore, to guarantee raw material supplying for the steel industrial. It is very important to our country.This essay regards elevation quality and decline miscellaneous of iron mine with more phosphor and arsenic in Yunnan as the object of the research, the iron personal status is 49.66%, the research sets out from the craft mineralogy, making a series of experiment .We draw a conclusion, the iron existed with the form hematite and of limonite , the phosphor existed with the form of collophane. We got that the result of chloridizing bake - Magnetic separation is better. And the phosphor in concentration of iron will be debased with adding medications.The experiment to raise the iron grade including the conventional single technology of mineral processing, the joint separation technology and baking magnetic separation technology. In a series of test and under conditions test found that the use of a single mineral processing, the joint other mineral processing, direct oxidation bake technology and reduction baking magnetic technology can not get the better concentrate index. Based on the above test results and process ore mineralogy of nature and theory analysis, Sorting indicators drawn from the low of iron ore mine dump iron ore, which was similar to the oolitic the structure and caused the poor separation results and low separation index.Use the chloride baking magnetic separation technology, the final product is a mixture of single iron and magnetic iron, therefore concentrations grade is high, and in the baking process the phosphorus content was decreased. The iron concentrations after magnetic separation was grinding and then add pharmacy can reduce the phosphorus content of below 0.2% so as to achieve the required standard.