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A method of making iron oxide ore reduction roasting green pellets by using iron beneficiation tailings

An iron oxide and ore technology, applied in the field of iron metallurgy, can solve the problems of increasing the cost of pelletizing, high price, and reducing the grade of pig ductile iron, etc., and achieve the effects of improving the iron grade, reducing the production cost and reducing the energy consumption.

Active Publication Date: 2016-08-24
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current iron ore pelletizing process mostly uses bentonite as a binder, which is expensive, increases the cost of pelletizing, and reduces the grade of green nodular iron.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A method for making iron oxide ore reducing and roasting green pellets by using iron beneficiation tailings, comprising the following process steps:

[0027] (1) Crush and grind the weakly magnetic iron oxide ore until the particle size is -200 mesh, accounting for 60-70%, through strong magnetic separation (selection parameters: magnetic field strength 0.8-1.2T, turntable speed 5 rpm, rinse water 20-25L / min) discard the qualified tailings with an iron grade below 13% in advance to obtain iron oxide ore rough concentrate products with an iron grade of 40.6%, and filter the obtained rough concentrate to a moisture content of 8- 13%;

[0028] (2) Classify the qualified tailings after the strong magnetic separation in step (1) through a cyclone to obtain a fine-grained tailings product with -400 mesh greater than 80%;

[0029] (3) Add fine-grained tailings equivalent to 2% of the mass of coarse concentrate and 3% coal powder into the rough concentrate, and then mix the ma...

Embodiment 2

[0032] The difference between embodiment 2 and embodiment 1 is:

[0033] In step (1), the iron grade of the obtained iron ore coarse concentrate product is 41.2%;

[0034] In step (3), fine-grained tailings equivalent to 5% of the mass of the coarse concentrate and 5% coal powder are mixed into the rough concentrate, and then the materials are mixed;

[0035] In step (4), the compressive strength of the obtained reduced-roasted iron oxide ore green pellets is 8.5N, and the number of drops is 4 times.

Embodiment 3

[0037] The difference between embodiment 3 and embodiment 1 is:

[0038] In step (1), the iron grade of the obtained iron ore coarse concentrate product is 43.4%;

[0039] In step (3), fine-grained tailings equivalent to 8% of the mass of the coarse concentrate and 1% coal powder are mixed into the rough concentrate, and then the materials are mixed;

[0040] In step (4), it was tested that the compressive strength of the obtained reduced-roasted iron oxide ore green pellets was 8.8N, and the number of drops was 3.9 times.

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Abstract

The present invention provides a method for making iron oxide ore reduction roasting green pellets by utilizing iron beneficiation tailings, which mainly includes the following process steps: (1) breaking and grinding the weakly magnetic iron oxide ore, and discarding in advance through strong magnetic separation Part of the qualified tailings to obtain iron oxide ore coarse concentrate products; (2) carry out particle size classification on the qualified tailings in step (1) to obtain fine-grained tailings products; (3) add Fine-grained tailings equivalent to 2-8% of coarse concentrate quality, 1-5% coal powder, and then mix the materials; (4) The mixed materials are fed into the pelletizing disc through the belt, and water is added to pelletize , that is, iron oxide ore reduction and roasting green pellets are obtained, and sent to reduction roasting equipment for reduction roasting. The process of the present invention uses the tailings discarded by strong magnetic separation as the pelletizing binder, fully utilizes the waste resources, and can properly recover the iron oxide in the tailings; it does not need to purchase bentonite or other binders separately, which effectively reduces the production cost. cost.

Description

technical field [0001] The invention belongs to the technical field of iron metallurgy, and relates to a method for producing iron oxide ore reduction roasting green pellets by utilizing iron beneficiation tailings. Background technique [0002] With the rapid expansion of the scale of domestic iron and steel enterprises, the contradiction of insufficient iron ore resources has become increasingly serious. On the one hand, iron and steel enterprises expand imports and invest in foreign mines, and on the other hand, they speed up the development of domestic ores. Due to the high cost of imported ores, more and more enterprises choose the latter. Iron ore that is poorer and more difficult to select will also come into the eyes of developers, and there are a large number of iron oxide ores that are weakly magnetic. One of the important utilization ways of this part of iron ore is reduction roasting-magnetic separation. [0003] Weak magnetic iron oxide ore refers to the singl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/242
Inventor 陈毅琳唐晓玲刘金长田仕友孙洪硕
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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