Recarburization ball for prebaked anode casting, preparation method of recarburization ball and phosphorous pig iron recarburization method

A technology of prebaked anode and phosphorus pig iron, which is applied in the field of prebaked anode casting carburizing balls and phosphorus pig iron carburization, which can solve the problems of affecting the performance of phosphorus pig iron, destroying the chemical composition of phosphorus pig iron, and impurity of electrolytic residual electrode particles, etc. , to achieve the effect of reducing material flying loss, good fluidity, and good carbon increase effect

Active Publication Date: 2017-06-20
SHANDONG NANSHAN ALUMINUM +1
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  • Description
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AI Technical Summary

Problems solved by technology

The anode carbon particles selected by this method have a relatively large proportion, which can reduce the flying loss and environmental pollution during the carburization process. Due to the long-term immersion of the electrolyte in the electrolytic cell, it contains a large amount of electrolyte, which leads to the impurity of the electrolytic residual electrode particles, which contain many electrolyte particles and powders, and the electrolyte contains Na, Al, O, Si and other elements. These impurities The elements will enter the phosphorus pig iron water with the recarburizer, destroying the chemical composition of the phosphorus pig iron, and then affecting the performance of the phosphorus pig iron

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  • Recarburization ball for prebaked anode casting, preparation method of recarburization ball and phosphorous pig iron recarburization method

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preparation example Construction

[0032] The embodiment of the present invention also provides a method for preparing recarburized balls for prebaked anode casting, which mainly includes the following steps:

[0033]S1. Sieving and crushing: Sieve ordinary cathode milling flour, crush the sieved material, and pass through a 5mm sieve to obtain carbon material cathode milling flour, that is, a carburant. The purpose of sieving and crushing is to obtain Homogenous cathode milling flour.

[0034] S2. Ingredients: Prepare the raw materials by weight percentage. The raw materials include 95.5% to 98.5% of cathode milling flour, 1.0% to 3.5% of binder and 0.5% to 1.0% of carbonate, wherein the binder consists of Composed of inorganic binder and organic binder with a mass ratio of 1:1.5 to 2, the inorganic binder preferably includes alkali metal silicates, fluorosilicates, aluminosilicates, phosphates, metal alkoxides, At least one of magnesium fluorosilicate, ammonium chloride, ammonium phosphate, zinc oxide, alumi...

Embodiment 1

[0058] Embodiment 1 provides a prebaked anode casting recarburizing ball, which is obtained by the following preparation steps:

[0059] Prepare raw materials: 9.65kg carbon material (selected with a true density of 2.02g / cm 3 , fixed carbon content 98.5%, cathode milling flour with a particle size below 5mm, the cathode milling flour is obtained by sieving ordinary cathode milling flour, crushing the sieve, and passing through a 5mm sieve), 0.3kg binder , the binder is configured according to the ratio of sodium silicate: (starch + sodium carboxymethyl cellulose) = 1:1.5, 0.05% melting agent (sodium carbonate is selected).

[0060]Preparation process: mix starch, sodium carboxymethylcellulose and water at 100°C in a mass ratio of 7:1, add sodium silicate and sodium carbonate under rapid stirring, stir for 0.5h, and cool naturally to room temperature to obtain Bonding material; Sprinkle the cathode milling flour into the bonding material, stir for 5 minutes to prepare a carbo...

Embodiment 2

[0070] Embodiment 2 provides a prebaked anode casting recarburizing ball, which is obtained by the following preparation steps:

[0071] Prepare raw materials: 9.8kg carbon material (selected with a true density of 2.08g / cm 3 , fixed carbon content 99%, cathode milling flour with a particle size below 5mm, the cathode milling flour is obtained by sieving ordinary cathode milling flour, crushing the sieve, and passing through a 5mm sieve), 0.15kg binder , the binder is configured according to the ratio of sodium fluorosilicate: (starch + polyvinyl alcohol) = 1:2, 0.05kg of melting agent (sodium carbonate is selected).

[0072] Preparation process: Mix starch, sodium carboxymethylcellulose and water at 100°C in a mass ratio of 10:1, add sodium silicate under rapid stirring, and add melting accelerator sodium carbonate, stir for 1 hour, and cool naturally to room temperature. Obtain the bonding material; sprinkle the cathode milling flour into the bonding material, and stir for ...

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Abstract

The invention relates to the field of aluminum electrolysis production, in particular to a recarburization ball for prebaked anode casting, a preparation method of the recarburization ball and a phosphorous pig iron recarburization method. The recarburization ball for prebaked anode casting is prepared by pressing 95.5%-98.5% of a carbon material, 1.0%-3.5% of a binder and 0.5%-1% of carbonate by mass percent into a pellet. The carbon material is cathode milling face powder generated in the aluminum cathode processing process. The preparation method is simple, the prepared recarburization ball is low in cost, and the recarburization effect on phosphorous pig iron is good. The phosphorous pig iron recarburization method comprises the steps that a recarburization agent and a phosphorous pig iron raw material are added into an intermediate frequency furnace in a layered manner, and then smelting is carried out. The method is high in carbon absorptivity and good in recarburization effect, and it can be guaranteed that the new phosphorous pig iron carbon content is controlled to range from 3.0% to 3.5%; meanwhile, material flying losses in the phosphorous pig iron recarburization process can be effectively reduced, and the workshop environment can be improved; and the flowability phosphorous pig iron liquid is good, and the obtained phosphorous pig iron meets the requirement of phosphorous pig iron for prebaked anode casting.

Description

technical field [0001] The invention relates to the field of aluminum electrolysis production, and in particular to a recarburization ball for prebaked anode pouring, a preparation method thereof and a method for recarburization of phosphorus pig iron. Background technique [0002] In the production of aluminum electrolysis, the prebaked anode is called the "heart" of the electrolytic cell. The prebaked anode is composed of an anode carbon block and an aluminum guide rod, specifically the gap between the steel claw of the aluminum guide rod and the carbon bowl of the anode carbon block. The phosphorus pig iron water is poured, and after cooling, the anode carbon block and the aluminum guide rod are combined into one, and the phosphorus pig iron plays the role of connection and conduction. Reducing the Fe-C pressure drop of the prebaked anode is one of the ways to reduce the production cost of electrolytic aluminum, and practice shows that adjusting the element ratio of phosp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C1/00C25C3/12
CPCC21C1/00C25C3/12
Inventor 程仁策汤昌廷马正清周平姜海涛高盼盼程鸿鹏刘瑞然王力史春丽张启东肖富来辛涛房洪杰祝贞凤杨丽娟李威
Owner SHANDONG NANSHAN ALUMINUM
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