Study On Integrated Process Of Beneficiation And Smelting Technology Of The Titanium Polymetallic Lean Ore In Xinjiang

The northwest of hongliugou mining area in Xinjiang has been found to be rich in titanium-bearing polymetallic ore.The preliminary exploration area is about 1 square kilometer,and the ore reserves in the surface regolith are up to more than 100 million tons.The mineral analysis found that the main phase in the mine was SiO2 with a grade of 46.9%,in addition,the grade of Al2O3 was 11.6%,the grade of Fe2O3 was 10.6%,and the grade of TiO2 was 2.0%.It can be seen that this mine belongs to low-grade and inferior titanium ore,therefore,to find an economic and reasonable treatment technology is the key to realize the efficient and clean utilization of this kind of poor and heteropoly polymetallic ore.In view of the high degree of wind-induced separation of the mineral surface in this area,a new green idea of combined beneficiation and smelting technology was proposed.The titanium-bearing polymetallic ore was divided into three minerals by gradient magnetic separation:low magnetic concentrate(iron concentrate),high magnetic concentrate(titanium concentrate)and high magnetic tailings(quartz tailing).then three kinds of mineral obtained by separation carbothermal reduction melting produc ferrosilicon alloys with low titanium content,ferrosilicon,aluminum-silicon alloy with a high silicon content.Thus,the high-value comprehensive utilization of ti-bearing polymetallic ore in Xinjiang is realized.In this paper,chemical analysis,XRD,SEM and other means were used to study the process mineralogy of titanium-bearing polymetallic ores in Xinjiang,and then single factor test was used to study the process of gradient magnetic separation and reduction smelting.The main conclusions of this paper are as follows:(1)The process mineralogy analysis results of the raw ore show that the mineral facies of titanium-bearing polymetallic ore in Xinjiang are composed of sodium feldspar,calcium feldspar,quartz and hematite.SEM-EDS analysis showed that the wind dissociation degree of raw ore was high,and the silicon-containing phase was SiO2 phase,which was mainly enriched with sodium and aluminum.Titanium is enriched with calcium and iron components to form the perovskite and ilmenite phases,as well as the weathering and dissociated Fe2O3 phase.(2)The results of gradient magnetic separation showed that:after grinding the raw ore to the particle size of 0.25 mm,the low magnetic concentrate composed of Fe2O3 61.44%,TiO22.21%,SiO2 20%and Al2O3 10.00%,Iron concentrate containing titanium,and the high magnetic concentrate composed of Fe2O3 16.12%,TiO2 5.19%,SiO2 40.00%and Al2O316.30%,the strong magnetic tailings composed of Fe2O3 5.47%,TiO2 0.89%,SiO2 51.00%and Al2O3 18.30%,the quartz ore,could be obtained through the gradient magnetic separation of 500 GS and 4000 GS.(3)The results of thermodynamic analysis show that the reduction difficulty of Fe2O3,K2O,Na2O,SiO2,TiO2,MgO,CaO and Al2O3 increases successively in the process of carbon thermal reduction.The stable region of Si in the Si-O-C reduction melting system increases with the increase of reduction temperature.The stable region of Fe in Fe-O-C reduction melting system is large,indicating that the reduction of Fe2O3,is easy In Ti-O-C reduction melting system,the reduction of TiO2 at low temperature is complicated,and the stable region of Ti is small.There is a large stable region of Al2O3 phase in the reduction melting system of Al-O-C,and the Al can only be reduced after the melting temperature exceeds 1973K.(4)The suitable melting conditions for the carbon-thermal reduction melting test of the low magnetic concentrate are:the melting temperature is 1800℃,the melting time is 0.5 h,the carbon distribution coefficient is 0.9,and the metal and slag is separated well.Under this condition,the reduction rate of metal is 78%.The titanium-containing ferrosilicon prepared is Si 19.28%,Fe 70.74%,Ti 3.10%,Al 2.13%and C 1.40%.(5)The suitable melting conditions for the carbon-thermal reduction melting test of high magnetic concentrates are as follows:distribution coefficient of carbon is 1.0,the CaO content is 5%of the ore,the melting temperature is 1800℃,and the melting time is 20 min.The alloy chemical components obtained by smelting are:Al 0.28%,Si 43.30%,Fe 53.17%,TiO2 66.00%,and C 0.18%.However,the slag viscosity in the process of reduction smelting of strong magnetic concentrate is large,and the separation effect of metal and slag is not good.(6)The suitable melting conditions for the carbon-thermal reduction melting test of the high magnetic tailings are as follows:distribution coefficient of carbon is 1.0,the CaO mixing amount is 20%of the ore,the waste aluminum mixing amount is 180 g,the melting temperature is 1800℃,and the melting time is 30 min.The chemical components of metal obtained by smelting are:Al 15.10%,Si 55.457%,Fe 19.17%,Ti 2.21%,and C 0.16%.