| The resources of lead and zinc mineral are rich in our country.Lead or zinc ore types mainly include sulphide ore,oxidized ore and the mixed ore etc.;Lead and zinc oxide accounts is about 1/5.in the proven lead-zinc mine resources reserves,They are mainly distributed in the southwest and northwest lead and zinc base.At present,the production of lead and zinc mainly used the sulfide ore concentrate as raw material.But,for low grade oxide ore,because there is no mature beneficiation technology and effective beneficiation reagents,very difficult to sorting or dressing index is not ideal,it's industrial development and utilization degree is extremely low.The effective development and utilization of low grade oxide ore is facing the common technical problems in the lead and zinc industry.A mining company in Shaanxi is the collection of lead and zinc mining,dressing and smelting integration of the non-ferrous metal production enterprise.It's proven oxidized ore?Zn+Pb10%?are about 600000 tons,the recoverable reserves of about320000 tons in the ore-body,Mining stockpiling of zinc oxide has about 80000 tons.In recent years,restricted by industrial policies and environmental protection,the company original sintering-furnace-fuming furnace processing zinc sulfide had to stop production,to reduce loss and improve enterprise economic benefits,how to make use of existing equipment to carry out the new product production has become one of the company's sustainable development key.Based on the analysis of the existing equipment characteristics of fuming furnace,literature and related on the production practice,analyzing the possibility of the treatment directly of low grade zinc oxide ore with fuming furnace.Through the theoretical calculation and partial transformation of the original fuming furnace design,determining the thermal conditions and process parameters of the whole cold material directly processing oxidized ore with fuming furnace and successfully applied in industrial production.The main research contents and results are as follows:?1?Based on thermodynamic analysis of oxidized ore reduction,determining the fuming furnace slag type and ratio of production materials,calculating the material and heat balance calculation of the technology of processing oxidized ore with fuming furnace.?2?In order to meet the production requirements of the whole cold material,the article discussed and design the reform measures of original fuming furnace cooling jacket,wind,measuring the furnace temperature,feed system and dust collecting system etc.?3?For 10 months of industrial trial production with fuming furnace extract zinc from oxidized ore,mainly analysis and research the influence of index on the smoke temperature,time,blast air volume,air pressure,intensity and frequency to coal during this period.On this basis,determining the whole cold material production process parameters.?4?The industrial trial production results:zinc oxide volatile rate is higher in the processing zinc oxide ore with fuming furnace.zinc evaporation rate was 86.51%,lead evaporation rate was 88.95%,the coal rate was 24.8%.Alkaline slag type is reasonable,slag melting point and viscosity is low,liquidity is good,advantageous to the volatilization of lead and zinc,the ratio of CaO/SiO2of fuming furnace slag is about0.647,on average,Pb0.13%,.Zn1.15%.?5?The technical and economic analysis of the industrial trial production.The consumption of oxidized ore are 24770.3 tons,the receive amount of soot are 3452.2tons,the content of zinc metal are 1835.53 tons in the smoke,the content of lead metal are 253.39 tons in the smoke during the industrial trial.The profits are 2.8535 million. |
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