Study On Comprehensive Utilization Of Valuable Elements In Ludwigite

China is a country which have many boron resources,and boron reserves ranked fifth in the world.The boron ore resources in China are mainly distributed in Liaoning area and Tibet area.The boron ore resources in Liaoning area are mainly ludwigite,and accounting for 60%of the total boron ore reserves of China.Compared with other countries,boron mineral resources in China have the characteristics of low grade and hard to transportation.Boron industry in China is using raw material to produce boric acid and borax.The by-product is Magnesium Sulfate.In China,the natural grade of ludwigite is getting lower and lower,and the increasing demand of China makes the resource of boron become more and more tense.The boron content of China's boromagnesite and ludwigite is lower than other country's,and most of the enterprises in China now use sulfuric acid method to dispose boron ore powder to produce boric acid,which not only pollutes the environment,but also wastes the boron resources.And this is unreasonable in economy and technology.In contrast,foreign boron ore resources have high grade,advanced boron production technology,good product quality,high scale efficiency and very competitive.China is also a big consumer of boron,so it is of great significance to make rational use of boron resources,especially ludwigite resources in China.This experiment is mainly divided into three stages to explore the comprehensive utilization of ludwigite.(1)Enrichment of valuable elements in ludwigite.The iron element was separated from other elements by carbon thermal reduction,and boron rich slag and boron containing cast iron were obtained,and the content of B was detected respectively.Boron containing cast iron with B content of 0.42%and boron rich slag with B2O3 content of 14.44%can be obtained at 1400? and 2 h reduction time;(2)The growth of suanite phase grain in boron rich slag.Explore the relationship between the different experimental conditions and the growth degree of the grain of suanite phase in boron rich slag,TiO2 and mineral quality added is 2:100,with the 0.5?·min-1 cooling rate,from 1400? to 1200?,the size of suanite phase grain in boron rich slag can reach 62 ?m;(3)The separation of suanite phase with other phase in boron rich slag.The floatability of different phases are different in boron rich slag.Using the different flotation conditions to separate suanite phase from boron rich slag.Under the experimental conditions of sodium oleate as collector that the dosage of sodium oleate is 5 kg·t-1 and calgon as inhibitor that the dosage of calgon is 1.5 kg·t-1 and pH as 8-9.The B2O3 content of product can reach 15.79%.Through the treatment of ludwigite and boron rich slag,the high grade boron minerals and the qualified boron containing cast iron have been obtained,and the three elements of B,Mg and Fe in B have been fully utilized.