The flotation process for treating tailings tin mud is generally carried out by degreasing and desulfurization and other degreasing processes, and then through the flotation process to obtain tin concentrate and tailings.
Qiu Yunhua et al. studied the tailings resources of the tailings reservoir in the history of Yunxi Company for a long time. From the analysis of tailings properties, combined with the tailings ore dressing test process research and production practice experience, a tailings coal tin tailings Pre-classification, sand and mud sorting, pre-stage selection by staged grit sand, rotary spiral chute pre-selection, shaker re-election, etc., finally using Φ250mm cyclone for pre-classification, grit grinding twice, shaker twice Different, staged overflow centrifuge pre-selection, belt chute selection process. The test obtained the inclusion of 0.18% tin, the grit produced 8.60% of tin containing tin concentrate, the tin recovery rate was 41.12%; the mud ore produced 5.56% of tin-rich ore, the tin recovery rate was 5.22%.
Lead zinc white and so were flying cow factories, mines and flotation tailings process were studied tin float. First, the tailings are re-elected to recover tin. Due to the fine grain size of the tin in the tailings, the recovery rate of the shaker is low, and the effect is not satisfactory. It is considered to recover the tin ore by flotation. BY29 is the collector , P86 is the auxiliary collector, BY25 and sodium carbonate are the gangue inhibitors. Once the floating tin can obtain the tin grade 8.56%, the recovery rate is 61.61% of the tin coarse concentrate, and the tin coarse concentrate re-floats. The grade of tin concentrate reached 53.58%, and the operation recovery rate was 81.35%. High-grade tin concentrate was obtained twice in floating tin, and the total tin recovery was 50.12%.
In order to improve the selection index of the copper street selection plant of Hualian Zinc and Indium Company, Tu Yuguo conducted the desulfurization condition test, the shaker re-election test of the tin after desulfurization and the fine grain by using the tailings of the flotation zinc plant as the test raw ore. Recovery test for tin. The sulfur recovery rate in the sulfur concentrate obtained in the desulfurization test was 52.32%, and the tin tin concentrate quality in the shaker re-election test was 23.11%, and the recovery rate was 59.82%.
Yan Kefei et al. conducted an experimental study on tailings in the tailings pond of the Xianghualing mining area in Hunan Province. Xianghualing tailings tailings as the principal metallic minerals cassiterite, sphalerite, pyrite, chalcopyrite mineral. The gangue minerals are quartz , ill mica , topaz , chlorite, calcite , dolomite, fluorite, and the like. Except for cassiterite, most of the other elements are present in the tailings with sulfide ore. It is difficult to obtain tin concentrate by flotation treatment of tailings, but the sulfur-containing components in tailings can be removed by flotation to create conditions for the enrichment and sorting of cassiterite. The result is a tin concentrate with a grade of 53%–55% and a recovery of more than 52%.
In the study of the comprehensive recovery of tin minerals in a certain cassiterite-polymetallic sulphide tailings, Ren Liuyan explored the flotation conditions and chemical system of tin minerals, and proposed the comprehensive recovery of tin in the tailings. Selection process. Since the content of sulfur in the ore is very high, in order to separate the tin, sulfur is first removed by using sulfuric acid. According to the study of mineral properties, cassiterite is mainly present in the fine-grain grade, and the tin grade in the coarse-grained grade is low. The coarse fraction should be removed first to improve the recovery of fines. In the floating tin test, several drugs were compared and selected, and finally BY29 was used as a collector, and sodium carbonate was used as an inhibitor for the floating tin test. The crude concentrate obtained from the primary float tin was further floated with tin. The tin concentrate contained 48.76% of tin and the operation recovery rate was 81.35%. The total recovery rate of tin in the first and second stages of float tin was 49.88%.
Based on the process mineralogy of tailings reservoir coarse, fine tailings and fresh fine tailings, Zhou Yongcheng applied the coagulation roasting-magnetic separation method to the treatment of oxidized vein tin tailings for the first time, and developed a new synchronous recovery of tin-iron. Process; from tin tailings with 0.15%–0.38% tin and 8.87%–22.42% iron, the tin rich mines with grade and recovery rates of 4.01%–4.56% and 61.93%–63.80%, respectively. The iron concentrates with grade and recovery rates of 62.17%–66.58% and 84.65%–87.47%, respectively, and the content of tin and iron in the tailings were less than 0.02% and 1.00%, respectively, which was significantly better than the conventional process. Sorting indicators. The thermodynamic calculation of the reaction that may occur through the coagulation roasting process and the XRD and SEM-EDS studies of the calcination reveal the separation of the tin-iron mineral from the gangue mineral and the mechanism of separation and simultaneous recovery of tin-iron, ie, the redness of the fine particles. The limonite is condensed and reduced into coarse-grained triiron tetroxide, and the liquid tin formed by the reaction is agglomerated. The gangue minerals such as carbonate are not reduced or decomposed, and their occurrence state is not changed. The key to efficient separation from gangue minerals; the pores and cracks created between the mineral interfaces cause the cassiterite and iron minerals to be easily dissociated, creating conditions for the separation of tin and iron minerals.
Sun Aihui and other studies have shown that the tin and sulfur grades in a shaker re-election tailings are 0.41% and 4.31%, respectively. More than 80% of tin and sulfur are distributed in the -38μm class of slime. The removal of sulfur in the re-selected tailings will have a greater impact on the subsequent flotation of tin, so pre-desulfurization is taken. The addition of a small amount of P86 can reduce the cost of the drug while ensuring the index. After pre-desulfurization-floating tin process, the grade and recovery of tin in tin concentrates reached 3.58% and 81.93%, respectively.
The tin-silver flotation tailings tin grade of Yunxi Gejiu Kafang Company is 0.35%. The main tin-containing mineral cassiterite not only has a fine grain size, but also closely relates to the gangue mineral inlay, and the floatability or density is also related to the gangue mineral. Closer, resulting in a single re-election process in the field can only obtain tin concentrate with a tin grade of about 6% and a tin recovery of about 50%. In order to efficiently recover the tin resources in the tailings, Yao Jianwei and others conducted a beneficiation test using a flotation-re-election process. Through a coarse and two fine three sweep test, a flotation tin concentrate with a tin grade of 8.26% and a tin recovery of 83.51% can be obtained; the flotation tin concentrate can be re-selected by a shaker to obtain a tin grade of 40.70%. The re-election concentrate with a recovery rate of 68.95% and a re-selected tailings with a tin grade of 1.72% and a recovery rate of 14.56% can be used as a raw material for the recovery of tin from the smouldering process.
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