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Effect of Strontium Tailings on Environment and Preparation of Strontium Salts

Author: QuGe
Tutor: XuLongJun
School: Chongqing University
Course: Safety Technology and Engineering
Keywords: Strontium tailings Strontium gangue Strontium slag Environmental Impact Recycling
CLC: TD926.4
Type: Master's thesis
Year: 2008
Downloads: 84
Quote: 2
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Abstract


Papers using chemical analysis method , strontium tailings ( strontium waste rock and strontium slag ) characteristics were analyzed , investigated the stockpiling of the environmental impact of its Comprehensive Utilization . Occupied by strontium tailings stockpiling land, pollution of water bodies , and atmospheric pollution , and damage to the surrounding ecological environment . Strontium waste rock and slag leaching experiment results show that the , soluble strontium gangue strontium , barium dissolution and leaching process in line with the characteristics of fractal dynamics , of strontium residue soluble strontium , barium sulfide dissolution and leaching process are in line with the fractal Kinetics of characteristics. The dissolved strontium waste rock and excessive concentration of strontium in the leaching solution ; barium concentration is not exceeded ; strontium sulfide concentration of strontium slag dissolution and leaching solution is seriously overweight , barium concentration is not exceeded . Chongqing strontium waste rock, slag as the main raw material , to carry out a study of strontium carbonate recycling in the recycling process of strontium chloride and strontium waste rock from strontium slag . The results showed that the optimum conditions for strontium slag into strontium chloride : strontium slag particle size of 0.054mm, and the reaction time of 2 hours , the liquid-solid mass ratio of 3.3 , n ( NH 4 Cl) / n (SrO ) 3.8 . Under this condition from strontium slag recovery of strontium chloride recoveries of up to 96.12% . From the recovery of strontium carbonate, strontium gangue optimum reaction temperature of 90 ° C , the reaction time was 60 min of Na2CO3 concentration of 0.8 mol / L , SrSO4 conversion rate reached 96.51% . The celestine strontium nitrate prepared Process studies have shown that as processing of the conversion agents as Na2CO3 celestite ore, and then nitric acid treatment of the crude strontium carbonate celestite transformed , when the concentration of HNO3 is 3.5 to 4.0 mol / L , n (HNO3) / N ( SrCO3) 2.01 to 2.29 , the liquid to solid ratio of 5.2 to 6.4 , the conversion rate of the strontium carbonate 80 % -93% of to take strontium nitrate prepared by the above method , celestite strontium conversion rate reached 90.91% .

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CLC: > Industrial Technology > Mining Engineering > Beneficiation > Beneficiation processes and methods > Processing after the election > Tailings disposal and comprehensive utilization
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