Direct flotation method of zinc sulfide ore

Abstract

The invention relates to a direct flotation method of zinc sulfide ore. The method includes the steps of grinding the zinc sulfide ore to form ore pulp, adjusting the PH value of the ore pulp to reach 6-11, adding N-alkyl dithiocarbamic acid sodium as a collecting agent and terpenic oil as a foaming agent into the ore pulp, adding zero or little copper sulfate as an activating agent and carrying out flotation. According to the method, copper activation-free direct flotation of the zinc sulfide ore can be realized, the use amount of copper sulfate can be remarkably lowered, and subsequent flotation separation of zinc sulfide and other metal sulfide ore can be promoted.

Description

technical field [0001] The invention relates to a direct flotation method of zinc sulfide minerals, which can realize direct flotation of zinc sulfide minerals without copper activation, and belongs to the field of mineral processing engineering. Background technique [0002] my country is rich in zinc resources, and its zinc reserves rank second in the world. About 90% of industrial zinc production comes from zinc sulfide minerals. Sphalerite and sphalerite are the most common zinc sulfide minerals in nature. There are few pure sphalerites in nature, and most sphalerites usually contain some iron impurities. When the iron content in sphalerite is greater than 6%, it is called iron sphalerite (Zn x Fe 1-x S), when the iron content is greater than 20%, it is called ultra-high iron sphalerite. The color of sphalerite depends on the type and content of impurity elements in the crystal lattice. Generally, sphalerite with higher iron content is darker in color, while purer spha...

AI Technical Summary

Problems solved by technology

However, sphalerite copper sulfate activated xanthate flotation also has some unsatisfactory disadvantages:

[0003] (1) Copper sulfate has a good activation effect on sphalerite and some iron sphalerites with low iron content, but the activation becomes more and more difficult as the iron content of sphalerite increases and the amount of activator is greatly increased. increase, the activation of sphalerite often fails to achieve the desired activation effect;

[0004] (2) Practice shows that sphalerite activated by copper sulfate is difficult to be suppressed. Secondly, copper sulfate, as a broad-spectrum activator in the mineral processing field, can also cause a certain degree of damage to other non-ferrous metal sulfide ores and even gangue minerals. Activation, these factors make the separation of sphalerite and other metal sulfide ores very difficult, such as copper-zinc separation, lead-zinc separation, etc., resulting in low-grade zinc concentrate and metal intercontainment problems;

[0005] (3) The addition of copper sulfate undoubtedly increases the cost of beneficiation

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