Iron-increasing and silicon-reduction mineral separation method for iron ores

Abstract

The invention discloses an iron-increasing and silicon-reduction mineral separation method for iron ores, which comprises the following steps of: producing TFe60 to 66 percent iron ore concentrate by the conventional mineral separation method; executing a cationic collector reverse-flotation process on the TFe60 to 66 percent iron ore concentrate to obtain cationic collector reversely-floated iron ore concentrate and middling; executing an anionic collector reverse-flotation process on the middling obtained by the cationic collector reverse-flotation to obtain anionic collector reversely-floated iron ore concentrate, and discharging tailings; and combining the cationic collector reversely-floated iron ore concentrate and the anionic collector reversely-floated iron ore concentrate to obtain final high-quality iron ore concentrate. The method has the advantages of high iron ore concentrate grade, high iron recovery rate, low fine iron mineral loss, low mineral separation energy consumption, low medicament consumption, and the capacity of solving the industrial problem of the difficult filtration of fine-grained concentrate caused by the addition of starch and greatly optimizing concentrate filtration, and can be used for the separation of magnetic iron ores as well as weakly-magnetic iron minerals, such as hematite and the like.

Description

technical field [0001] The present invention relates to an iron ore beneficiation method, in particular to an iron ore beneficiation method for iron ore reduction and silicon reduction, which is suitable for the separation of quartz-type magnetite ore and quartz-type hematite, especially for Iron and silicon reduction of fine-grained quartz-type lean magnetite ore to produce high-quality iron ore concentrate. Background technique [0002] The main characteristics of my country's iron ore are "poor", "fine" and "miscellaneous". The average iron grade is 32%, which is 11 percentage points lower than the world average grade. Among them, 97% of the iron ore needs to be processed, and the complex and difficult-to-select red iron ore accounts for a large proportion, accounting for about 20.8% of the iron ore reserves. [0003] Magnetite ore beneficiation has always been the main body of iron ore beneficiation. In my country's iron ore concentrate output, magnetite concentrate is ...

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Problems solved by technology

[0008] However, dodecylamine, a commonly used cationic collector, also has obvious deficiencies: large amount of foam, high viscosity, difficult defoaming, and poor fluidity in the flotation process, resulting in difficult follow-up operations; poor selectivity of dodecylamine and poor mineral separation effect greatly affected

[0010] However, the reverse flotation process of anion collectors has many kinds of reagents, complex reagent system, and large consumption, and the ore slurry needs to be heated to about 30°C, which also increases the operating cost, especially in the winter in the north, and the energy consumption is very high. high

In addition, the use of starch as an inhibitor of iron minerals also makes it difficult to filter the concentrate, which brings great difficulties to subsequent operations

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