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A kind of beneficiation process for processing diamond and magnetic mixed ore

A technology of ore and process, which is applied in the field of iron ore separation, can solve the problems of large difference in embedded particle size and ineffective recovery, etc., and achieve the effect of reducing grinding energy consumption, reducing beneficiation cost, and saving grinding energy consumption

Active Publication Date: 2017-02-22
NORTHWEST RES INST OF MINING & METALLURGY INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a kind of beneficiation process of dealing with rhomboid and magnetic mixed ore, which can effectively solve the problem of large difference in embedded particle size of magnetite and siderite in rhizome and magnetic mixed ore, and high pyrite content. , calcite, and siderite in the ore cannot be effectively recovered by flotation, and iron concentrates with qualified grades can be obtained

Method used

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  • A kind of beneficiation process for processing diamond and magnetic mixed ore

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Experimental program
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Effect test

Embodiment 1

[0022] A beneficiation process for processing diamond-magnetic mixed ore, comprising the following process steps:

[0023] a) Feed the crushed diamond and magnetic mixed ore raw ore into the first-stage grinding closed-circuit system composed of the first-stage mill and the first-stage grading cyclone group for circular grinding and classification, specifically, after being ground by the first-stage mill The ore enters the first-stage classifying cyclone group to form -200 mesh overflow material and grit-set material, which account for 60-70% of the material, and the grit-set returns to the first-stage mill to continue grinding and grading, so that the cycle continues and the overflow material that meets the requirements is produced. The overflow material discharged from a classifying cyclone group is subjected to strong magnetic separation. The magnetic field strength of the strong magnetic separation is 4000 Oe, and the strong magnetic tailings with an iron grade of 11.23% ar...

Embodiment 2

[0028] The difference between embodiment 2 and embodiment 1 is:

[0029] In step a), the magnetic field strength of the strong magnetic separation is 3500 Oe, the iron grade of the thrown strong magnetic tailings is 11.64%, and the iron grade of the strong magnetic concentrate obtained is 41.87%;

[0030] In step c), the magnetic field strength of the first-stage weak magnetic separation is 2500 Oe, and the magnetic field strength of the second-stage weak magnetic separation is 800 Oe, and the iron grade of the final iron concentrate 1 obtained is 63.22%;

[0031] In step d), the iron grade of the shaker tailings thrown out after shaker gravity separation is 18.55%, and the iron grade of the obtained shaker concentrate is 47.66%; the roasting conditions for direct roasting are: roasting temperature 600~650°C, The roasting time is 45 minutes; the iron grade of the obtained final iron concentrate II is 58.21%.

Embodiment 3

[0033] The difference between embodiment 3 and embodiment 1 is:

[0034] In step a), the magnetic field strength of the strong magnetic separation is 5000 Oe, the iron grade of the thrown strong magnetic tailings is 9.89%, and the iron grade of the strong magnetic concentrate obtained is 41.90%;

[0035] In step c), the magnetic field strength of the first-stage weak magnetic separation is 2000 Oe, and the magnetic field strength of the second-stage weak magnetic separation is 900 Oe, and the iron grade of the final iron concentrate 1 obtained is 62.71%;

[0036] In step d), the iron grade of the shaker tailings thrown out after shaker gravity separation is 19.03%, and the iron grade of the obtained shaker concentrate is 48.06%; the roasting conditions for direct roasting are: roasting temperature 650~700°C, The roasting time is 30 minutes; the iron grade of the obtained final iron concentrate II is 58.45%.

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Abstract

The invention provides a mineral processing technology for siderite-magnetite mixed ore. The mineral processing technology mainly comprises the followings process steps: a) the crushed siderite-magnetite mixed raw ore is fed into a primary grinding closed loop system for circular grinding and classification, and the obtained overflowing material is subjected to strong magnetic separation, so that strong magnetic concentrate with the iron grade greater than 40% is obtained; b) the strong magnetic concentrate is fed into a secondary grinding closed loop system for circular grinding and classification, and the obtained overflowing material is subjected to reverse flotation desulfuration, so that the desulfurated concentrate and desulfurated tailings are obtained; c) two-stage low intensity magnetic separation is performed on the desulfurated tailings, so as to form final iron ore concentrate I with the iron grade more than 62% and two-stage weak-magnetic tailings; d) the one-stage weak-magnetic tailings and the two-stage weak-magnetic tailings are mixed and then the mixture is fed into a table concentrator for mineral processing, so that table concentrator middling and table concentrator concentrate with the iron grade greater than 45% are obtained, the table concentrator middling is fed into a secondary grinding machine for processing again; the table concentrator concentrate is roasted directly, so that the roasted ore with the grade greater than 58% is obtained and used as final iron ore concentrate II.

Description

technical field [0001] The invention belongs to the technical field of iron ore separation, and relates to a mineral separation process for processing diamond-magnetic mixed ore. Background technique [0002] With the development of the country's social economy and the continuous increase in investment in infrastructure construction, the consumption of steel is very large. Every year, my country imports a huge amount of iron ore to make up for the shortage of domestic steel demand. In recent years, as the price of imported iron ore continues to rise, it is very realistic and important for my country's iron and steel industry to make reasonable and effective use of domestic iron ore. [0003] The rhomboid and magnetic mixed ore is a common type of iron ore in China, and its ore properties vary greatly depending on the place of origin. A kind of rhomboid and magnetic mixed ore produced in the northwest region of my country. The original ore has a low grade of total iron, only...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03C1/30
Inventor 刘宝山李健民郭海宁刘涛巩明辉苗梁彭建成刘斯佳李国栋郭艳华
Owner NORTHWEST RES INST OF MINING & METALLURGY INST
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