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A beneficiation method that can improve the flotation concentrate rate and recovery rate of fine-grained refractory iron ore

A beneficiation method and fine particle technology, which are applied in chemical instruments and methods, wet separation, solid separation, etc., can solve the problems of high iron grade in tailings, low iron recovery rate in concentrates, and high cost, and achieve high iron recovery rate. , The effect of low renovation cost and small investment

Active Publication Date: 2016-08-17
CHANGSHA RES INST OF MINING & METALLURGY
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  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the deficiencies of the existing domestic and foreign iron ore flotation processes, such as high tailings iron grade, low concentrate iron recovery rate, and high cost, and propose a simple and controllable flow process with flotation tailings A beneficiation method that can improve the flotation concentrate yield and recovery rate of fine-grained refractory iron ore with low grade iron ore and high recovery rate of concentrate iron

Method used

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  • A beneficiation method that can improve the flotation concentrate rate and recovery rate of fine-grained refractory iron ore

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Embodiment 1

[0029] The main component of iron minerals in the ore processed by a concentrator is specularite, followed by magnetite and hematite, and a small amount of siderite and limonite; the gangue minerals are mainly quartz, followed by amphibole and mica , and a small amount of garnet, kyanite, chlorite and trace apatite. The specularite is widely distributed, often in the form of euhedral, semi-euhedral plates, flakes or granular, and a few are needle-shaped; the crystal grain size varies greatly, the coarse ones can reach 0.6mm, and the fine ones are less than 0.01mm, generally between 0.03~0.4 mm. use as figure 1 Shown mineral processing method of the present invention handles aforementioned iron ore, specifically comprises the following steps:

[0030](1) Grinding in the early stage: the raw iron ore is first crushed to below 12mm, and then enters a closed-circuit grinding and grading system for a stage of grinding and grading, and the fineness of the grading overflow is contr...

Embodiment 2

[0038] The iron minerals in the ore processed by a concentrator are mainly hematite and magnetite, followed by semi-false to false hematite, and sporadic limonite is occasionally seen; the gangue minerals are mainly quartz. The particle size of magnetite mostly ranges from 0.05mm to 0.20mm, which belongs to the category of fine-grained intercalation; while most of the particle sizes of hematite are distributed between 0.01mm and 0.08mm, which belongs to the category of fine-grained intercalation. use as figure 1 Shown mineral processing method of the present invention handles aforementioned iron ore, specifically comprises the following steps:

[0039] (1) Grinding in the early stage: the raw iron ore is first crushed to below 12mm, and then enters a closed-circuit grinding and grading system for a stage of grinding and grading, and the fineness of the grading overflow is controlled to be -200 mesh, accounting for 50%~ 55%, the classified grit returns to the closed-circuit gr...

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Abstract

The invention discloses a beneficiation method for improving the micro-fine particle refractory iron ore flotation ore-concentrate production rate and the recovery rate. The method includes the following steps that pre-treated micro-fine particle rough concentrate is sent to a closed circuit grinding grading system, so that most of the rough concentrate undergoes monomer separation; obtained ground ore products which undergo monomer separation sequentially undergo low-intensity magnetic separation, high-intensity magnetic rough flotation and high-intensity magnetic scavenging carried out at least once, and ultimately, low-intensity magnetic ore-concentrate and high-intensity magnetic rough ore-concentrate are obtained, the obtained high-intensity magnetic rough ore-concentrate is concentrated, concentration bottom currents are involved in a reverse flotation operation, and accordingly reverse flotation ore-concentrate is obtained; the low-intensity ore-concentrate and the reverse flotation ore-concentrate are combined to form a finished ore-concentrate product, foam after reverse flotation enters a high-intensity magnetic floatation procedure for re-flotation, the ore-concentrate after high-intensity magnetic flotation treatment returns to the closed circuit grinding grading system, and the preceding steps are repeated. The method has the advantages that procedure operations are easy and controllable, the iron grade of flotation tailings is low, and the recovery rate of the ore-concentrate is high.

Description

technical field [0001] The invention relates to an iron ore beneficiation method, in particular to an ore beneficiation method which can improve the iron ore flotation yield and recovery rate. Background technique [0002] In recent years, the rapid development of my country's national economy has driven the continuous high-speed growth of my country's iron and steel industry, which has led to a sharp increase in iron ore consumption. The development of the economy urgently needs to rely on the progress of mineral processing technology to maximize the use of my country's limited iron ore resources, thereby increasing the self-sufficiency rate of domestic iron ore and reducing the dependence of my country's iron and steel industry on imported ore. [0003] The main characteristics of my country's iron ore are "poor", "fine" and "miscellaneous". The average iron grade is only 32%, about 11 percentage points lower than the world's average iron grade, and 97% of the iron ore iro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03B7/00
Inventor 严小虎陈雯李家林唐雪峰张立刚廖振鸿
Owner CHANGSHA RES INST OF MINING & METALLURGY
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