Beneficiation method for producing high-quality iron ore concentrate by low-grade magnetic iron ore

Abstract

The invention discloses a beneficiation method for producing high-quality iron ore concentrate by low-grade magnetic iron ore, which comprises the following steps that a stage grinding-stage magnetic separation discarding tailing beneficiation process is adopted to produce magnetic separation ore concentrate with the iron ore concentrate grade TFe of 62-66%; a positive ion collector reverse flotation process is adopted on the magnetic separation ore concentrate to obtain positive ion collector reverse flotation iron ore concentrate and middling; a negative ion collector reverse flotation process is adopted on the middling obtained by positive ion collector reverse flotation to obtain negative ion collector reverse flotation iron ore concentrate; and the positive ion collector reverse flotation iron ore concentrate and the negative ion collector reverse flotation iron ore concentrate are combined to obtain the ultimate high-quality iron ore concentrate. The invention has the advantages of high grade of iron ore concentrate, high iron recovery rate, small loss of fine iron minerals, low beneficiation energy consumption and small consumption of medicaments, can relieve the industry difficulty of difficult filtration caused by adding starch into fine concentrate, greatly optimizes concentrate filtration operation, can be used for the sorting of magnetite ore, and can also be used for the sorting of weakly magnetic iron minerals such as hematite and the like.

Description

technical field [0001] The present invention relates to a mineral processing method for iron ore, in particular to a mineral processing method for producing high-quality iron ore concentrate from low-grade magnetite ore. The selection of quartz-type lean magnetite ore to produce high-quality iron 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 the main one. At present, the magnetite beneficiation technology mainly adopts the stage grinding of ...

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Problems solved by technology

[0009] However, dodecylamine, a commonly used cationic collector, also has obvious deficiencies: in the flotation process, the amount of foam is large, the viscosity is high, the defoaming is difficult, and the fluidity is poor, which makes subsequent operations difficult; the selectivity of dodecylamine is poor, and the mineral separation effect is poor. greatly affected

[0011] However, the reverse flotation process of anion collectors has many varieties of reagents, complex reagent system, and large consumption, and the 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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