Method for reducing sulfur in iron ore concentrate through flotation

Abstract

The invention discloses a floating sulfur collecting agent and a method for reducing the sulfur in iron ore concentrate through flotation. The floating sulfur collecting agent consists of amyl potassium xanthate and N,N-diethyl sulfo-amino sodium formate in a mass ratio of 1-3:1. The method for reducing the sulfur in the iron ore concentrate through flotation by using the floating sulfur collecting agent comprises the following steps of: adding regulators into low intensity magnetic separation iron ore concentrate pulp so as to adjust the pH value, further adding the floating sulfur collecting agent provided by the invention, and carrying out the primary rough separation and the primary fine separation, wherein pyrrhotite with better dissociation can be floated in the rough separation, pyrrhotite coenobium can be further floated in the fine separation, the sulfur content in the iron ore concentrate obtained after the fine separation can be less than 0.1%, and the iron loss can be less than 5%. The method for reducing the sulfur in the iron ore concentrate through flotation is simple in steps and is strong in operability as only the floatation working needs to be added, and the sulfur can be reduced to 0.1% under the condition that the sulfur content in feeding is as high as 1%, so that the requirements of large steel companies for the raw materials are met, and the overall quality of steel materials is improved.

Description

technical field [0001] The invention belongs to the field of mineral processing, in particular to a floating sulfur collector and a mineral flotation sulfur reduction process. Background technique [0002] At present, my country's iron concentrate furnace standard is that the sulfur content is less than 0.3%, and large iron and steel companies have stricter requirements, requiring the sulfur content to be less than 0.1%. If the sulfur content in iron concentrate exceeds the standard, it will cause hot brittleness of steel during steelmaking, affect the quality of steel, and also pollute the environment. Therefore, in order to improve the quality of steel and reduce the pollution of iron and steel to the atmosphere, it is necessary to reduce the sulfur content of iron concentrate as much as possible. [0003] The harmful impurity sulfur in iron concentrate generally exists in the form of pyrite or pyrrhotite, and the sulfur in the form of pyrite can be removed by adding xant...

AI Technical Summary

Problems solved by technology

However, when the traditional reagent system is used for flotation desulfurization, the collection capacity and selectivity of pyrrhotite are not very good, and the sulfur content in the iron concentrate after flotation is also difficult to reduce to below 0.3%.