| 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.With Sichuan Liang Shan height phosphorus roe shape, haematite, the limonite bring out a problem and cross-examine in court descending studying a marriage partner miscellaneous miscellaneous, That ore Fe grade is 38.13% , P contents are 0.604%, Mineralogy studies the secondary handicraft starting off , the experiment having carried out a series studies. Have made a thorough investigation of main ore utensil roe acinose structure, roe granule contents are in 55 80% or so about in the ore , iron in ore is that the form with haematite and the limonite outputs mainly, extremely, the haematite monomer size fine, is just like under 0.004 mm. Most haematite and few parts limonite are that the form with roe granule outputs in the ore, among 75% retinue of about all haematite haematite outputing with roe granule , the cement becoming the dip dyeing shape other scattering in the limonite. The main phosphorus form with the apatite in ore outputs, the apatite becomes its granular, most shape size mostly thinner , distribute the core part that few headquarters distribute among roe granule room cement, in roe granule mainly. Size change is bigger , size is in 0.002-0.2mm, part the shape being smaller than 0.002 mm, often becoming dip dyeing scatters. By the fact that weak magnetism of run of mine chooses an experiment, strong magnetism of run of mine chooses an experiment, the run of mine is opposing flotation, deoxidation torrefaction- magnetism elects , chlorinating separation- magnetism elects, the acid baking-magnetism selections- soaks deoxidation , the magnetism baking- magnetism selections-opposing the flotation experiment , reaching deoxidation torrefaction chooses deoxidation opposing flotation effect, economy feasibility is all fairly good.The condition carrying out deoxidation torrefaction by the fact that the selections baking magnetism to deoxidation opposes flotation tests a problem , condition and technological process that magnetism chooses test that, the magnetism deoxidation is baked- chooses a selected mine opposing flotation condition and technological process testing that the selections testing condition, reaching a run of mine baking magnetism course restoring opposes flotation handicraft finding out the best. The run of mine breaks to pieces～C till 3 mm the following queens , in 1000 , the reducer is that coke (size 1 mm following) dosages are 5% , restore 15 mins baking time being 12.5 mins～, the run of mine restores to 200 eyes account for 90% baking queen segment of mill ore , By that twice weak magnetism electing ,the grade is 59.35% , contains the phosphorus 0.476% or so iron selected mine .magnetism chooses a selected mine twice sweeping selections process grinding an ore being in progress till 300 eyes take up 60% ~ 70% queen, by that twice weak magnetism elects, the selected mine Fe grade is 60.53%, P contents are 0.235%, coefficient of recovery> 60%'s index. |
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