Detection Of Sulfide In Complex Ores

Sulfur is widely distributed in nature,and its existing states are natural sulfur,sulfide and sulfate.Among them,more than 350 kinds of sulfide minerals have been proved,and sulfide minerals with sulfur elements are the main ones.Because it is rich in all kinds of metal elements,the content and dissociation degree of sulfide minerals directly correlate with the recovery of valuable metals.With the increasing national demand for metal ores,the number of easy to mine mines is gradually decreasing,and the high-quality ore resources are also gradually decreasing.The utilization of complex ore with complex composition and general quality has become increasingly important.At present,there are mature detection methods for total sulfur and water sulfide.For sulfide in ores,some existing sulfide testing methods can only detect sulfide in simple ores.In the face of complex ores,there is still a lack of better detection methods..Therefore,in the mining and smelting process of complex ore,how to detect sulfide in ore economically,quickly and accurately,so as to guide the mining process optimization of complex ore,reduce the mining cost and improve the added value of ore,has important economic value and practical significance.On the basis of my experience of ore analysis and detection in a mining group in Fujian Province for more than ten years and the on-the-job postgraduate platform of Xiamen University,together with comprehensive analysis of the literature on the detection methods of total sulfur,elemental sulfur and sulfide,this thesis introduces the detection methods of total sulfur,elemental sulfur and sulfide,focus on the study and examination of barium sulfate gravimetric method and infrared absorption method for the detection process of sulfide in many mines owned by the group.After systematic investigating the factors affecting the detection accuracy,a best detection performance were obtained.For sulfide in six mines within the group,the results show that the RSD of barium sulfate gravimetric method is between 0.24%and 1.79%,and that of infrared absorption method is between 0.19%and 3.25%.For the mine samples of the group’s hot pressing project,the infrared absorption method can be used for batch detection of sulfide after sample treatment,which can meet the requirement of a series of sulfide samples from raw ore,gold concentrate to pre acidified slag,flash slag and tailings of hot pressing leaching.Infrared absorption method has fast detection speed,and the whole detection cycle only takes six hours,which can greatly shorten the time of process adjustment and optimization,and realize timely monitoring and guidance of hot pressing production.In view of the limitations of the above two methods in the detection of pyrite,and the shortcomings of infrared absorption method in the accurate determination of special ore samples containing alunite and barite,together with the study of the existing standard methods and literatures,we rebuilt a set of high temperature roasting hydrogen peroxide absorption and sodium hydroxide titration device,and developed a new 580℃ roasting method for the detection of sulfide in some complex ores in the group.The method can be used for the determination of sulfide in pyrite,alunite and barite.This method is accurate and effective for the detection of sulfide in the above special ore samples in a very short time,with a fast detection cycle of only 10 minutes.The precision experiment shows that the RSD of this method is 0.55～1.06%.Through the detection and verification of sulfide in four kinds of ore samples in the group,it shows that the 580℃ roasting method is a good complement of gravimetric method and infrared method.Finally,by using the actual ore samples from several mines in the group for detection and comparison,this thesis summarizes the application scope,advantages and disadvantages of the three sulfide detection methods,and establishs a mature selection scheme for sulfide rapid detection in the mining process.At present,the three methods optimized in this paper are being spreaded to other detection departments of our group.After satisfying thedetection needs of the detection departments of relevant production units and smelting units of our group,higher economic value is created continuously.