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A rare earth molten salt stirring rod and preparation method thereof

A stirring rod and molten salt technology, which is applied in the field of rare earth molten salt corrosion-resistant stirring rod and its preparation, can solve the problems affecting the purity index of rare earth products, easy oxidation and corrosion, and excessive molybdenum content, so as to slow down the continuous ablation and slow down The degree of corrosion and the effect of easy operation

Active Publication Date: 2018-04-10
INNER MONGOLIA METAL MATERIAL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the graphite material stirring rod currently used has excellent thermal conductivity, high temperature resistance and acid and alkali corrosion resistance, it is easy to be oxidized and corroded in high temperature electrolyte, and carburized will affect the purity index of rare earth products.
Metal molybdenum rods are used to stir electrolytic molten salt instead of graphite rods. Although it has a high melting point, it is relatively stable to rare earth metals and their oxides below 1400 ° C and has excellent high-temperature strength and other properties, but its corrosion resistance in electrolytes is relatively low. Poor, fast consumption, the corroded molybdenum enters the rare earth products and the molybdenum content exceeds the standard, etc.

Method used

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  • A rare earth molten salt stirring rod and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The rare earth molten salt stirring rod consists of two parts, the rod core and the refractory coating on the outside, as follows:

[0030] 1. Choose a threaded carbon steel rod with a diameter of ø16mm and a length of 1600mm.

[0031] 2. Mixed refractory coating materials

[0032] 2.1 Refractory coating material formula by mass percentage:

[0033] The particle size is 180 mesh MgO sand 56%, the particle size is 240 mesh Al 2 o 3 10% sand, 1% sodium bentonite, 4% polyvinyl acetate emulsion, 1.5% sodium carboxymethyl cellulose, 27.5% tap water;

[0034] 2.2 Mixing of refractory coating materials

[0035] Put the prepared refractory coating material into a small ball mill, mix it for 1.5 hours, pour it out and use it.

[0036] 3. Brushing and baking of the coating.

[0037] Apply the mixed refractory coating to the outer surface of the threaded carbon steel rod, bake and dry each layer of paint before painting the lower layer of paint; repeat the above steps until ...

Embodiment 2

[0040] The rare earth molten salt stirring rod consists of two parts, the rod core and the refractory coating on the outside, as follows:

[0041] 1. Choose a threaded carbon steel rod with a diameter of ø18mm and a length of 1800mm.

[0042] 2. Mixed refractory coating materials

[0043] 2.1 Refractory coating material formula by mass percentage:

[0044] The particle size is 200 mesh MgO sand 57%, the particle size is 220 mesh Al 2 o 3 Sand 9%, sodium bentonite 1%, polyvinyl acetate emulsion 5%, sodium carboxymethyl cellulose 1.5%, tap water 26.5%;

[0045] 2.2 Mixing of refractory coating materials

[0046] Put the prepared refractory coating material into a small ball mill, mix it for 1.5 hours, pour it out and use it.

[0047] 3. Brushing and baking of the coating.

[0048] Apply the mixed paint to the outer surface of the threaded carbon steel rod, bake and dry each layer of paint and then paint the lower layer of paint. Repeat the above steps until the coating th...

Embodiment 3

[0051] The rare earth molten salt stirring rod consists of two parts, the rod core and the refractory coating on the outside, as follows:

[0052] 1. Choose a threaded carbon steel rod with a diameter of ø20mm and a length of 2000mm.

[0053] 2. Mixed refractory coating materials

[0054]2.1 Refractory coating material formula by mass percentage:

[0055] The particle size is 220 mesh MgO sand 58%, the particle size is 200 mesh Al 2 o 3 8% sand, 1% sodium bentonite, 3% polyvinyl acetate emulsion, 1.5% sodium carboxymethyl cellulose, 28.5% tap water;

[0056] 2.2 Mixing of refractory coating materials

[0057] Put the prepared refractory coating material into a small ball mill, mix it for 1.5 hours, pour it out and use it.

[0058] 3. Brushing and baking of the coating

[0059] Apply the mixed paint to the outer surface of the threaded carbon steel rod. After each layer of paint is baked and dried, the lower layer of paint is applied. Repeat the above steps until the thic...

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Abstract

The invention discloses a rare-earth molten-salt stirring rod and a manufacturing method thereof. The rare-earth molten-salt stirring rod is characterized by comprising a rod core and a fire-resistant coating on the outer part of the rod core, wherein the fire-resistant coating of the rare-earth molten-salt stirring rod consists of the following components in percentage by mass: 56%-60% of MgO sand with grain size being 180-240 mesh, 6%-10% of Al2O3 sand with grain size being 180-240 meshes, 0.8-1.2% of sodium bentonite, 2%-6% of polyvinyl acetate emulsion, 1.3-1.8% of sodium carboxymethyl cellulose and 26%-30% of tap water; the fire-resistant coating is 3-5 mm thick; and the weighed fire-resistant coating materials are grinded, brushed and roasted to obtain a finished product. According to the rare-earth molten-salt stirring rod and the manufacturing method thereof, MgO+Al2O3 magnesium-aluminum sand powder fire-resistant coating is coated on the outer surface of a carbon steel rod to prepare the rare-earth molten-salt stirring rod which achieves corrosion resistance effect while applied to stirring electrolyte molten salt.

Description

technical field [0001] The invention relates to a rare earth molten salt corrosion-resistant stirring rod and a preparation method thereof, belonging to the technical field of metal smelting. Background technique [0002] Electrolysis is the most widely used method to prepare a large amount of mixed rare earth metals, single light rare earth metals and rare earth alloys. It has the advantages of high preparation purity, low production cost and continuous operation. The rare earth metals and their alloys prepared by it have been widely used in various industries, especially the rare earth materials with high purity are used in aerospace and national defense construction, giving full play to the unique chemical and physical performance of rare earth elements. Electrolytic molten salt contains rare earth oxides such as oxides, fluorides, and chlorides, which are highly corrosive. The molten salt temperature varies with the proportion of different rare earth oxide additions, ge...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C3/34C25C7/06C04B35/66
CPCC04B35/66C25C3/34C25C7/06
Inventor 高平张鸣一兰兰贺新民吕建军顾明俊丁杰敬郭在在李海豹邸建辉杨春霞田迎春
Owner INNER MONGOLIA METAL MATERIAL RES INST