Beneficiation activating agent for sphalerite and marmatite and method for reducing zinc in iron ore concentrate through flotation

Abstract

The invention relates to a beneficiation activating agent for sphalerite and marmatite and a method for reducing zinc in iron ore concentrate through flotation. The activating agent is amino acid or a mixture containing the amino acid, wherein the amino acid is one or more of asparaginic acid, asparaginic acid hydrochloride, glutamic acid, glutamic acid hydrochloride, threonine and serine. According to the method for reducing zinc in iron ore concentrate through flotation by using the activating agent, the activating agent is added into low-intensity magnetic separation iron ore concentrate pulp, then a collecting agent and a foaming agent are added, one-time roughing and one-time concentration are carried out, sphalerite and marmatite are floated out, the zinc content in the obtained iron ore concentrate is as low as 0.02% or below, and the iron loss amount is smaller than 5%. According to the invention, the problems that conventional activating agents of sphalerite and marmatite are poor in activating selectivity, zinc impurities in the iron ore concentrate are difficult to deeply remove, and the iron loss in the zinc reducing process is large are solved, the method is simple, easy to operate and good in zinc reducing effect, the zinc content can be reduced to 0.02% or below, and the requirement of the high-purity iron ore concentrate for the content of the zinc impurities is met.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a beneficiation activator for sphalerite and sphalerite and a method for reducing zinc by flotation of iron concentrate. Background technique [0002] At present, my country's iron ore concentrate standard is that the zinc content is less than 0.1%, and some large iron and steel companies require that the zinc content is less than 0.02% when producing high-purity iron ore concentrate. Excessive zinc content in iron concentrate not only directly affects the quality of steel products, but also leads to abnormal distribution of blast furnace gas flow, upturned tuyeres, damage to refractory bricks, furnace wall bonding and nodules, material collapse, and wind shutdown during steelmaking. Rate increase and many other problems affect the normal production of the blast furnace. Therefore, to improve the quality of high-end special steel and ensure the smooth oper...

AI Technical Summary

Problems solved by technology

Although these activators can indeed activate sphalerite and marmatite, there are following defects as iron concentrate deep dezincification activators: (1) the activation effect is not outstanding, and it is difficult to realize the deep zinc reduction of iron concentrate (such as reduce the zinc content to less than 0.02%); (2) the amount of iron loss is large, the activation performance of the above-mentioned agents is better under weakly acidic or alkaline conditions, and copper ions themselves can also activate iron minerals. Therefore, some weak magnetic The iron ore concentrate inevitably enters the zinc concentrate, resulting in a large loss of iron

Although these disclosed sphalerite and marmatite flotation activators have improved the selective activation and inhibition performance of the medicament and can be activated under low pH (7-11) conditions, they are still not suitable for iron ore concentrates. Depth flotation of ore to reduce zinc, a large amount of iron ore enters zinc concentrate, and a large amount of iron loss

Images