Geological Characteristics And Application Research Of Limestone Deposit In Lishanping Of Dazhu County

Limestone,a carbonate rock,is mainly composed of calcium carbonate.It can be used in many industries such as metallurgy,construction,chemical industry,medicine,agriculture,forestry,fishery,environmental protection and so on.With the development of industrializations,limestone has become more and more widely used.Dazhou Shanli Building Materials Co.,Ltd.currently owns the limestone prospecting rights of Lishanping in Dazhu County,and has established a quicklime production line.Due to its poor economic efficiency,it is necessary to carry out industrial transformation to increase the economic benefits of limestone deposits.In order to realize the economic value of the limestone deposit,it is necessary to consider further processing and utilization of limestone on the basis of the quicklime production line.Taking the limestone deposit in Lishanping,Dazhu county as the research object,the field geological survey was carried out,and the mining geological,ore body and orel characteristics were ascertained through various test and analysis techniques.In order to improve the economic value of the mineral deposits,systematic sampling was conducted,samples were tested and analyzed,and calcination process tests were conducted.A production line of 50,000 tons of calcium hydroxide and light calcium carbonate per year was designed.The limestone deposit of Lishanping,Dazhu,is deposited in the stratum of the third member of Feixianguan Formation in the Lower Triassic and is a product of shallow marine sediments.The occurrence is consistent with the occurrence of the strata,and is distributed continuously along the strike.The ore body is controlled to a length of 2000m and the thickness of the ore body tends to increase from north to south.The main types of ore are oolitic limestone and microcrystalline limestone.The chemical compositions of the ore are CaO:51.20%to 54.76%,Si O₂:1.00%to 4.58%,Mg O:0.56%to 0.94%,K₂O:0.03%to 0.35%,Na₂O:0.021%to 0.035%and SO₃:0.015%to 0.56%.It is suitable for open pit mining,and the mining technical conditions are medium and complicated.The transportation is convenient,water and electricity is also convenient,it is easy to carry out construction.The samples used for the limestone calcining process test have a CaO content of51.08%to 54.57%,an average of 53.55%,a Si O₂ content of 0.74%to 4.56%,and a Mg O content of 0.7%to 0.94%.In addition,Al₂O₃,Fe₂O₃,Na₂O,K₂O,P₂O₅,Ti O₂,SO₃ content is very low.The main mineral composition is calcite,dolomite and quartz.The optimum calcination temperature and calcination time for different limestones are different,mainly related to the CaO content and the amount of impurities.According to the calcining results of each sample,the calcining process of 1050?and 60min was selected.With the same digestion conditions,the calcined lime was calcined after the homogeneous mixing of the limestone samples,and the conversion rate of lime was up to 93.58%when the water cement ratio(mole ratio)was 2.Finally,two schemes are provided for the construction of the mine,namely the design of the production line of 50,000 tons of calcium hydroxide and the design of the production line of 50,000 tons of light calcium carbonate.About the annual output of 50000 tons of calcium hydroxide production line,the investment value of 7.888million yuan,the factory covers an area of about 800 m²,water costs RMB 61000 per year,electricity costs 2.69 million yuanper year,annual production cost is 17.878million yuan.According to the market sold an average of 500 yuan/t,the annual net profit of 2.154 million yuan,net profit of 43 yuan per ton,the investment recovery period is about 3.66 years.About the annual output of 50000 tons of light calcium carbonate production line,the investment value of 17.939 million yuan,the factory covers an area of about 1000 m²,the annual water cost is 452 thousand yuan,the annual electricity cost 331.2 yuan,the annual production cost is 18.9486 million yuan.According to the market average 600 yuan/t,the annual net profit is 4 million 463thousand and 600 yuan,the net profit of each ton is 89.3 yuan,the investment recovery period is about 4.02 years.