Method and system for restraining reduction degradation of kakoxene pellet

A technology of iron ore powder and iron ore balls, which is applied in the field of phosphate rock pellet metallurgical production, can solve serious pulverization problems such as no prevention, no suppression of reduction pulverization, and no solution to reduction pulverization, so as to solve the problem of phosphate rock reduction Effects of pulverization, porosity reduction, and energy consumption reduction

Pending Publication Date: 2017-04-26
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this process is that there are no preventive measures for the serious pulverization problem in the smelting reduction process
The disadvantage of this process is that although a certain amount of binder is added into the pellets, it only solves the thermal stability and strength of the phosphate rock pellets during the smelting and reduction process, and there is no measure to inhibit the reduction and pulverization
The disadvantage of this process is that the added catalyst and binder only solve the functions of reduction, catalysis and fluxing, but do not solve the problem of reduction pulverization and fluctuation of furnace conditions

Method used

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  • Method and system for restraining reduction degradation of kakoxene pellet

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) Grinding the phosphate iron ore to obtain phosphate iron ore powder, requiring that the ratio of the particle size of the phosphate iron ore powder to be less than 0.074mm is between 60% and 80%;

[0042] (2) mix ferrophosphite powder and bentonite evenly to obtain a mixture; the specific proportioning ratio is 95 kg of ferric phosphorite powder and 5 kg of bentonite;

[0043] (3) The mixture is pelletized on a pelletizing machine (disc pelletizing machine) to make green pellets, and the pellets are balls with a diameter of 10-18mm; wherein boric acid aqueous solution is added as pelletizing pellets during the pelletizing process. Ball water; the concentration of the boric acid aqueous solution is 0.2% (mass percentage), and the total mass of the phosphorite powder and bentonite is 100%, and the addition of the 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, bor...

Embodiment 2

[0047] (1) Grinding the phosphate iron ore to obtain phosphate iron ore powder, requiring that the ratio of the particle size of the phosphate iron ore powder to be less than 0.074mm is between 60% and 80%;

[0048] (2) mix ferriphosphite powder and bentonite evenly to obtain a mixture; the specific proportioning is 99 kg of ferriphosphite powder and 1 kg of bentonite;

[0049] (3) The mixture is pelletized on a pelletizing machine (cylindrical pelletizing machine) to make green pellets, and the pellets are round balls with a diameter of 10-18mm; wherein boric acid aqueous solution is added as pelletizing pellets during the pelletizing process. Ball water; the concentration of the boric acid aqueous solution is 0.5% (mass percentage), and the total mass of the phosphorite powder and bentonite is 100%, and the addition of the boric acid aqueous solution is 2%. The addition point of the boric acid aqueous solution is the water addition point of the pelletizing machine. Firstly, ...

Embodiment 3

[0053] (1) Grinding the phosphate iron ore to obtain phosphate iron ore powder, requiring that the ratio of the particle size of the phosphate iron ore powder to be less than 0.074mm is between 60% and 80%;

[0054] (2) mix ferriphosphite powder and bentonite evenly to obtain a mixture; the specific proportioning is 97kg of ferriphosphite powder and 3kg of bentonite;

[0055] (3) The mixture is pelletized on a pelletizing machine (disc pelletizing machine) to make green pellets, and the pellets are balls with a diameter of 10-18mm; wherein boric acid aqueous solution is added as pelletizing pellets during the pelletizing process. Ball water; the concentration of the boric acid aqueous solution is 0.8% (mass percentage), and the total mass of the phosphorite powder and bentonite is 100%, and the addition of the boric acid aqueous solution is 1.5%. The addition point of the boric acid aqueous solution is the water addition point of the pelletizing machine. Firstly, boric acid an...

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Abstract

The invention discloses a method and system for restraining reduction degradation of kakoxene pellet. The method for restraining reduction degradation of the kakoxene pellet is firstly disclosed and comprises the following steps that firstly, kakoxene is levigated, and kakoxene powder is obtained; secondly, the kakoxene powder and bentonite are mixed, and a mixture is obtained; thirdly, the mixture is subjected to pelletizing, and a green ball is obtained, wherein in the pelletizing process, a boric acid water solution is added and serves as pelletizing water; and fourthly, the green ball is roasted, and the kakoxene pellet is obtained. The system for implementing the method is also disclosed and comprises a levigating device, a material mixing device, a pelletizing device and a roasting device. By means of the water adding link in the procedure of pellet production pelletizing, the boric acid water solution is sprayed to the green ball in the pelletizing process, pellet pelletizing is completed, the reduction degradation rate of the prepared kakoxene pellet is remarkably reduced, and the metallurgical performance of the pellet in the smelting reduction process is improved.

Description

technical field [0001] The invention relates to a method and a system for suppressing reduction pulverization of phosphate rock pellets, and belongs to the field of metallurgical production of phosphate rock pellets. Background technique [0002] Phosphate ore contains impurities such as free water, crystal water, and carbonates, which will be disintegrated and pulverized when heated. The low-temperature reduction pulverization index is high, and the RDI is only about 50%, which seriously affects the technical and economic indicators of smelting. [0003] Chinese Patent Application Publication No. CN 103663396 A discloses a pelletizing method using medium and low-grade phosphate rock or phosphate rock powder. Its main technical features are: uniformly mixing a certain proportion of phosphate rock powder, water, coke powder and flux It is pressed into balls again, which solves the problem of forming balls without adding binder. The disadvantage of this process is that there ...

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 薛逊曾照翔吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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