Ore nature
The ore is taken from the tailings of a zinc-sulfur separation plant where the tin grade is 0.73%. The main minerals are pyrrhotite and pyrite, and a small amount of iron sphalerite, brittle sulphur, and cassiterite. And trace gangue. The tailings have a coarser grain size with a +0.15mm grain-size yield of 46.86%, and a +0.15mm grain-grade tin grade is relatively low, with tin only accounting for 17.71%; -0.074+0.010mm grain grade tin grades are higher, with tin The highest grade is 2.07%; tin is mainly present in the -0.15mm grade.
In order to investigate the dissociation of the cassiterite in the tailings, the degree of monomer dissociation was determined. The results showed that the dissociation degree of the cassiterite was 40.85%, and the cassiterite was mainly associated with pyrite. Pyrrhotite, brittle sulphur and lead are associated, and a small amount is associated with gangue.
Beneficiation method
At this stage, the main method for recovering the tin from the sulphide ore tailings is the desulfurization and flotation-shaker re-selection process, and a few mines use magnetic separation to recover the tin in the tailings. The grain size distribution of the cassiterite mineral in the ore is not uniform, and the dissociation degree of the cassiterite monomer is low; the content of sulfide minerals such as pyrite and pyrrhotite in the impurity minerals is as high as 98%, and some pyrite and toxic sand grains Relatively coarse, plus pyrite and arsenopyrite are inhibited in the separation of zinc and sulphur. If flotation is used to remove sulfide minerals, a large amount of chemicals must be added to float the sulphide minerals and the cassiterite is seriously entrained, resulting in tin recovery. The rate is low. The specific magnetic susceptibilities of the three major minerals, pyrrhotite, pyrite, and cassiterite are respectively 4321.95×10-9m3/kg, 26.98×10-9m3/kg and 0.83×10-9m3/kg, taking into account the magnetic yellow iron. The difference in magnetic susceptibility between the minerals, pyrite and cassiterite, combined with the conditions of the concentrator, focuses on the magnetic separation of the tailings.
Study on Magnetic Separation Desulfurization Conditions
The impurity minerals contained in the ore contain much different magnetic susceptibilities between pyrrhotite and pyrite. Therefore, the principle flow is used as a coarse sweep to remove the weak magnetic pyrite from the tailings step by step. Magnetic pyrrhotite, which enriches the cassiterite.
1, weak magnetic roughing conditions
In order to preferentially remove the pyrrhotite from the zinc-sulfur separation tailings, the weak magnetic separator was first used for sorting, and the magnetic induction field strength of the weak magnetic field was studied. With the increase of magnetic field strength, the tin grade of tin concentrate first increases and then decreases. The tin recovery rate tends to decrease. Considering both tin concentrate quality and recovery factors, it is better to choose magnetic field magnetic induction strength of 0.160T. index of.
2, strong magnetic election sweep conditions
The zinc-sulfur separation tailings contain a large amount of pyrrhotite, and the weak magnetic separation tailings are selected by a strong magnetic separator and most of the pyrrhotite is selected. The magnetic field strengths are 0.40T, 0.60T and 1.00T, respectively. Electromagnetic Separator and High Gradient Magnetic Separator for Concentration of Rougher Concentrates . Electromagnetic strong magnetic separators and high gradient magnetic separators have the same magnetic separation rules: As magnetic induction magnetic field induction strength increases, the magnetic material 2 yield increases, tin grade increases, and tin concentrate recovery rate gradually decreases. The indicators of grade and tin recovery were selected as the high-gradient magnetic separator with a magnetic field induction of 0.60T to obtain a beneficiation index with a tin grade of 1.65% and a tin recovery rate of 63.10%.
In this paper, through the study of the methods and conditions for the separation of zinc-sulfur tailings, the objective of enrichment of cassiterite was achieved, and finally a better beneficiation index was obtained. The successful application of this method in production enabled the goal of comprehensive utilization of tailings resources.
The ore is taken from the tailings of a zinc-sulfur separation plant where the tin grade is 0.73%. The main minerals are pyrrhotite and pyrite, and a small amount of iron sphalerite, brittle sulphur, and cassiterite. And trace gangue. The tailings have a coarser grain size with a +0.15mm grain-size yield of 46.86%, and a +0.15mm grain-grade tin grade is relatively low, with tin only accounting for 17.71%; -0.074+0.010mm grain grade tin grades are higher, with tin The highest grade is 2.07%; tin is mainly present in the -0.15mm grade.
In order to investigate the dissociation of the cassiterite in the tailings, the degree of monomer dissociation was determined. The results showed that the dissociation degree of the cassiterite was 40.85%, and the cassiterite was mainly associated with pyrite. Pyrrhotite, brittle sulphur and lead are associated, and a small amount is associated with gangue.
Beneficiation method
At this stage, the main method for recovering the tin from the sulphide ore tailings is the desulfurization and flotation-shaker re-selection process, and a few mines use magnetic separation to recover the tin in the tailings. The grain size distribution of the cassiterite mineral in the ore is not uniform, and the dissociation degree of the cassiterite monomer is low; the content of sulfide minerals such as pyrite and pyrrhotite in the impurity minerals is as high as 98%, and some pyrite and toxic sand grains Relatively coarse, plus pyrite and arsenopyrite are inhibited in the separation of zinc and sulphur. If flotation is used to remove sulfide minerals, a large amount of chemicals must be added to float the sulphide minerals and the cassiterite is seriously entrained, resulting in tin recovery. The rate is low. The specific magnetic susceptibilities of the three major minerals, pyrrhotite, pyrite, and cassiterite are respectively 4321.95×10-9m3/kg, 26.98×10-9m3/kg and 0.83×10-9m3/kg, taking into account the magnetic yellow iron. The difference in magnetic susceptibility between the minerals, pyrite and cassiterite, combined with the conditions of the concentrator, focuses on the magnetic separation of the tailings.
Study on Magnetic Separation Desulfurization Conditions
The impurity minerals contained in the ore contain much different magnetic susceptibilities between pyrrhotite and pyrite. Therefore, the principle flow is used as a coarse sweep to remove the weak magnetic pyrite from the tailings step by step. Magnetic pyrrhotite, which enriches the cassiterite.
1, weak magnetic roughing conditions
In order to preferentially remove the pyrrhotite from the zinc-sulfur separation tailings, the weak magnetic separator was first used for sorting, and the magnetic induction field strength of the weak magnetic field was studied. With the increase of magnetic field strength, the tin grade of tin concentrate first increases and then decreases. The tin recovery rate tends to decrease. Considering both tin concentrate quality and recovery factors, it is better to choose magnetic field magnetic induction strength of 0.160T. index of.
2, strong magnetic election sweep conditions
The zinc-sulfur separation tailings contain a large amount of pyrrhotite, and the weak magnetic separation tailings are selected by a strong magnetic separator and most of the pyrrhotite is selected. The magnetic field strengths are 0.40T, 0.60T and 1.00T, respectively. Electromagnetic Separator and High Gradient Magnetic Separator for Concentration of Rougher Concentrates . Electromagnetic strong magnetic separators and high gradient magnetic separators have the same magnetic separation rules: As magnetic induction magnetic field induction strength increases, the magnetic material 2 yield increases, tin grade increases, and tin concentrate recovery rate gradually decreases. The indicators of grade and tin recovery were selected as the high-gradient magnetic separator with a magnetic field induction of 0.60T to obtain a beneficiation index with a tin grade of 1.65% and a tin recovery rate of 63.10%.
In this paper, through the study of the methods and conditions for the separation of zinc-sulfur tailings, the objective of enrichment of cassiterite was achieved, and finally a better beneficiation index was obtained. The successful application of this method in production enabled the goal of comprehensive utilization of tailings resources.
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