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Method and system for improving reducing property of high-aluminum pellet ore

A high-alumina ore and high-alumina ball technology, which is applied to the system implementing the method, improves the reduction performance of high-alumina pellets, and can solve the problem of severe pulverization of high-alumina ore powder sintered ore and the failure to take measures to suppress high-alumina pellets. Problems such as pulverization of aluminum sinter and untargeted improvement of reduction pulverization rate have achieved the effects of reducing reduction pulverization rate, improving metallurgical performance indicators, smelting utilization coefficient and smelting intensity

Pending Publication Date: 2017-04-26
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Abstract
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AI Technical Summary

Problems solved by technology

The disadvantage of this process is that it only provides a method of using high alumina powder, and does not solve the problem of severe pulverization of high alumina powder sintered ore in the process of smelting and reduction.
The disadvantage of this process is that the air permeability problem in the sintering process is improved through sintering ore blending, but in the next step of smelting and reduction, there is no targeted measure to improve the reduction and high pulverization rate
The disadvantage of this process is: the application is limited to the sintering production process, and no measures have been taken to prevent the serious pulverization of high-alumina sinter during the smelting reduction process

Method used

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  • Method and system for improving reducing property of high-aluminum pellet ore

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Grinding high alumina ore to obtain high alumina ore powder; it is required that the proportion of high alumina ore powder with a particle size less than 0.074mm is between 60% and 80%;

[0041] (2) high alumina ore powder and bentonite are mixed to obtain a mixture; the specific proportioning is, high alumina ore powder 95kg, bentonite 5kg;

[0042] (3) The mixture is made into green balls on a pelletizing machine (disc pelletizing machine), and the green balls are balls with a diameter of 10-18mm; wherein boric acid aqueous solution is added in the pelletizing process as water for pelletizing; wherein , the boric acid aqueous solution concentration is 0.3% (mass percentage); Taking the total mass of high alumina powder and bentonite as 100%, the addition of boric acid aqueous solution is 1%. The addition point of the boric acid aqueous solution is the water addition point of the pelletizing machine. Firstly, boric acid and pelletizing water are mixed to form a bor...

Embodiment 2

[0046] (1) Grinding high alumina ore to obtain high alumina ore powder; it is required that the proportion of high alumina ore powder with a particle size less than 0.074mm is between 60% and 80%;

[0047] (2) High alumina powder and bentonite are mixed to obtain a mixture; the specific proportioning is 99 kg of high alumina powder and 1 kg of bentonite;

[0048] (3) The mixture is made into green balls on a pelletizing machine (cylindrical pelletizing machine), and the green balls are balls with a diameter of 10-18mm; wherein boric acid aqueous solution is added as pelletizing water during the pelletizing process; wherein , the boric acid aqueous solution concentration is 0.6% (mass percentage); Taking the total mass of high alumina powder and bentonite as 100%, the addition of boric acid aqueous solution is 2%. The addition point of boric acid is the water addition point of the pelletizing machine. First, mix boric acid and pelletizing water to form a boric acid aqueous solu...

Embodiment 3

[0052] (1) Grinding high alumina ore to obtain high alumina ore powder; it is required that the proportion of high alumina ore powder with a particle size less than 0.074mm is between 60% and 80%;

[0053] (2) mix the high alumina powder and bentonite to obtain a mixture; the specific proportioning is, high alumina powder 97kg, bentonite 3kg;

[0054] (3) The mixture is made into green balls on a pelletizing machine (disc pelletizing machine), and the green balls are balls with a diameter of 10-18mm; wherein boric acid aqueous solution is added in the pelletizing process as water for pelletizing; wherein , the concentration of boric acid aqueous solution is 0.9% (mass percentage); Taking the total mass of high alumina powder and bentonite as 100%, the addition of boric acid aqueous solution is 1.5%. The addition point of boric acid is the water addition point of the pelletizing machine. First, mix boric acid and pelletizing water to form a boric acid aqueous solution of the re...

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Abstract

The invention discloses a method and system for improving the reducing property of high-aluminum pellet ore. The method for improving the reducing property of the high-aluminum pellet ore comprises the following steps that (1) the high-aluminum ore is fine ground, so that high-aluminum ore powder is obtained; (2) the high-aluminum ore powder and bentonite are evenly mixed, so that a mixture is obtained; (3) pelletizing is conducted on the mixture, so that fresh pellets are obtained, wherein a boric acid aqueous solution is added in the pelletizing process to serve as pelletizing water; and (4) the fresh pellets are roasted, so that the high-aluminum pellet ore is obtained. The invention further discloses the system for implementing the method. The system comprises a fine grinding device, a mixing device, a pelletizing device and a roasting device. According to the method and system for improving the reducing property of the high-aluminum pellet ore, in the water adding link of the production and pelletizing procedure of the pellet ore, the boric acid aqueous solution is added into the fresh pellets in the growing process of the fresh pellets, and pelletizing of the pellets is completed; and the metallurgical performance index of the high-aluminum pellet ore prepared through the method and system is obviously improved, and the reducing pulverization rate is obviously decreased.

Description

technical field [0001] The invention relates to a method for improving the reduction performance of high alumina pellets, and also relates to a system for implementing the method, which belongs to the field of high alumina powder metallurgical pellet production. Background technique [0002] In recent years, the world's iron ore resources have become increasingly scarce, and a large number of cheap high-alumina ore powders have been used as raw materials for blast furnaces. The reduction and pulverization rate of high-alumina pellets is high, which seriously affects the air permeability of the material column and reduces the efficiency of blast furnace smelting. [0003] Chinese patent application publication number CN 102102146 A discloses a method of sintering using high-alumina refractory limonite. Sintered production. The disadvantage of this process is that it only provides a method for using the high alumina powder, and does not solve the problem of severe pulverizati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/243C22B1/16
CPCC22B1/243C22B1/16C22B1/2406C22B1/2413
Inventor 吴道洪曾照翔
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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