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Method and system for improving metallurgical performance of sulfuric-acid residue pellets

A technology for sulfuric acid slag pellets and sulfuric acid slag, which is applied in the field of improving the metallurgical properties of sulfuric acid slag pellets, can solve the problems of no preventive measures for the expansion problem, no mention of the reduction expansion inhibition method of the sulfuric acid slag pellets, etc. Improved expansion rate index, less impurities, and remarkable effect

Pending Publication Date: 2017-05-31
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this process is that it only provides a preparation method of sulfuric acid slag pellets, and does not mention the means of inhibiting the reduction and expansion of sulfuric acid slag pellets.
The disadvantage of this process is that it only takes into account the bursting and pulverization of the sulfuric acid slag raw pellets during drying and preheating, and there is no preventive measure for the expansion problem during the high-temperature reduction process.
The disadvantage of this process is that the effect of the measures taken is only reflected in the sintering process, and no restrictive measures are taken for the expansion problem that inevitably occurs in the high temperature reduction stage of sulfuric acid slag pellets

Method used

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  • Method and system for improving metallurgical performance of sulfuric-acid residue pellets

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) Grinding the sulfuric acid slag finely to obtain the sulfuric acid slag powder, the ratio of which the particle size is required to be less than 0.074mm is between 50% and 70%;

[0045] (2) mixing the sulfuric acid slag powder and bentonite to obtain a mixture; the specific proportioning is, sulfuric acid slag powder 97kg, bentonite 3kg;

[0046] (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 8-15mm; wherein, boric acid aqueous solution is added during the pelletizing process as pelletizing pellets With water, the concentration of boric acid aqueous solution is 0.5% (mass percentage); the addition point of boric acid is the water addition point of the pelletizer, first add boric acid to the water adding tank for adding water to raw balls, and prepare boric acid aqueous solution with required concentration with boric acid and water , add water to the raw ball along with th...

Embodiment 2

[0050] (1) Grinding the sulfuric acid slag finely to obtain the sulfuric acid slag powder, the ratio of which the particle size is required to be less than 0.074mm is between 50% and 70%;

[0051] (2) mixing the sulfuric acid slag powder and bentonite to obtain a mixture; the specific proportioning is, sulfuric acid slag powder 99kg, bentonite 1kg;

[0052] (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 8-15mm; wherein, boric acid aqueous solution is added during the pelletizing process as pelletizing pellets With water, the concentration of boric acid aqueous solution is 1% (mass percentage); the addition point of boric acid is the water addition point of the pelletizer, first add boric acid to the water adding tank for adding water to raw balls, and prepare boric acid and water to obtain the required concentration of boric acid aqueous solution , add water to the raw ball a...

Embodiment 3

[0056] (1) Grinding the sulfuric acid slag finely to obtain the sulfuric acid slag powder, the ratio of which the particle size is required to be less than 0.074mm is between 50% and 70%;

[0057] (2) mixing the sulfuric acid slag powder and bentonite to obtain a mixture; the specific proportioning is, sulfuric acid slag powder 98kg, bentonite 2kg;

[0058] (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 8-15mm; wherein, boric acid aqueous solution is added during the pelletizing process as pelletizing pellets With water, the concentration of boric acid aqueous solution is 1.5% (mass percentage); the addition point of boric acid is the water addition point of the pelletizer, first add boric acid to the water adding tank for adding water to raw balls, and prepare boric acid aqueous solution with required concentration with boric acid and water , add water to the raw ball along with th...

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Abstract

The invention discloses a method and system for improving the metallurgical performance of sulfuric-acid residue pellets. The method for improving the metallurgical performance of the sulfuric-acid residue pellets includes the steps that sulfuric-acid residues are ground to obtain sulfuric-acid residue powder; the sulfuric-acid residue powder is evenly mixed with bentonite to obtain a mixture; the mixture is prepared into green pellets in a pelletizing machine; and the green pellets are roasted to obtain the sulfuric-acid residue pellets, and when the mixture is prepared into the green pellets in the pelletizing machine, a boric acid water solution is added in the growth process of the green pellets to serve as pelletizing water. The invention further discloses the system for implementing the method. The system comprises a grinding device, a mixing device, a pelletizing device and a roasting device. Boric acid is added into the green pellets through the water adding link in the pelletizing procedure in pellet production, so that the expansion phenomenon of the pellets in the high-temperature reduction process is effectively reduced and inhibited, and the blast furnace smelting utilization coefficient and the smelting strength of the pellets are remarkably improved.

Description

technical field [0001] The invention relates to a method and a system for improving the metallurgical performance of sulfuric acid slag pellets, belonging to the production field of sulfuric acid slag pellets. Background technique [0002] Sulfuric acid slag is the waste residue of pyrite acid production, and its main chemical composition is Fe 2 o 3 , its utilization rate has been low, and the accumulation of discarded sulfuric acid slag invades farmland and pollutes land, which not only causes waste of resources, but also leads to serious pollution of the ecological environment. The comprehensive utilization of sulfuric acid slag as a secondary resource has achieved results. The grindability of sulfuric acid slag is good. With the increase of fine grinding time, the proportion of each fine particle size increases. When the iron content of sulfuric acid slag increases to 60%, it meets the raw material requirements for the production of oxidized pellets. It can also be us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/24C22B1/02
CPCC22B1/2406C22B1/02
Inventor 曾刚高建夏碧华薛忠义曾照翔吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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