Process for improving quality and reducing impurities of tin stone multi-metal sulfide ore tin ore concentrate and combined equipment

Abstract

The invention relates to the field of metallurgy and particularly relates to a process for improving quality and reducing impurities of a tin stone multi-metal sulfide ore tin ore concentrate and combined equipment. The process comprises the following three procedures of: adjusting the grade of a shaking bed cut ore; increasing a procedure of sulfur removal and impurity removal for a tin rough ore concentrate; and increasing a procedure of tin selection of the ore concentrate subjected to the sulfur removal and impurity removal, so as to ensure the quality of the tin ore concentrate. The grade of the tin ore concentrate and the sulfur and arsenic content can easily reach to the quality standard of the ore concentrate; the requirements on the grade of the shaking bed cut ore are reduced and the cutting amount of the tin ore concentrated is obviously increased; the tin recycling rate is obviously improved; and a tine stone which is difficult to recycle and is tightly grown with a pyrite ore is sufficiently recycled on a shaking bed, and is produced in a manner of an enriched ore, so that the recycling rate of tin is improved.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a process for upgrading tin concentrate and reducing impurities of cassiterite polymetallic sulfide ore and combined equipment. Background technique [0002] At present, the reduction smelting method is mainly used in the smelting of tin concentrate, which requires the furnace grade to reach more than 40%. Sulfur and arsenic are harmful elements in tin concentrate smelting, and the content of sulfur + arsenic is required to be less than 4%. The content of sulfur and arsenic in tin concentrate exceeds the standard. It will increase the cost of smelting and directly affect the sales price of tin concentrate. With the continuous improvement of tin smelting technology, the middle-rich ore with a tin grade greater than 2.5% can also obtain better technical and economic indicators when put into the furnace, and its sales price is 50% of the qualified tin concentrate. [0003] The cassiterite...

AI Technical Summary

Problems solved by technology

Due to poor floatability or weak magnetism of some pyrite minerals, some pyrite minerals still enter the tin selection operation, resulting in unclear zoning of the bed surface, and fine-grained cassiterite and pyrite minerals are mixed in the concentrate zone Together, they cannot be cut into the tin concentrate, which makes it difficult to recycle the fine-grained cassiterite, and also increases the difficulty of the shaker operation. If the tin concentrate is intercepted too much, the quality of the tin concentrate cannot be guaranteed, and the content of sulfur and arsenic in the tin concentrate Exceeding the standard, less tin concentrate will affect the recovery rate of tin, and the quality and recovery rate of tin concentrate will be greatly affected. Indicators are greatly affected

[0005] Since some pyrite minerals in cassiterite polymetallic sulfide ores are adjacent to cassiterite or envelop fine-grained cassiterite, if desulfurization and iron removal are strengthened before tin selection, although the interference of pyrite minerals on gravity separation can be reduced, But it will increase the loss of tin, so it is not suitable to completely remove the pyrite minerals before tin selection

[0006] Based on the above circumstances, when selecting tin from cassiterite polymetallic sulfide ore, there is inevitably the problem of interference from pyrite minerals. The tin concentrate with a grade of more than 40% is directly produced on the shaker, not only the quality of the tin concentrate is difficult to guarantee, but also the tin It is also difficult to increase the recovery rate

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