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A kind of low-cost al-ti-b refiner and preparation method thereof

An al-ti-b, refiner technology, applied in the field of low-cost refiner and preparation, can solve the problems of low preparation efficiency, low refinement efficiency, low preparation cost, etc., and achieves improved refinement efficiency and distribution. Uniform, small size effect

Active Publication Date: 2016-01-20
大连科天新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The TiB2 particles in the tissue mostly exist in the form of aggregates, and the particles inside the aggregates are stuck together, the refinement efficiency is low, and serious pollution problems occur at the same time
In order to prepare high-efficiency Al-Ti-B refiners, various methods have been tried at home and abroad, such as oxide method, high-temperature self-propagating synthesis method, etc., but there are mainly disadvantages such as low preparation efficiency and low preparation cost.

Method used

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  • A kind of low-cost al-ti-b refiner and preparation method thereof
  • A kind of low-cost al-ti-b refiner and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The process of preparing Al-Ti-B refiner by contact reaction method is as follows:

[0019] 1. Raw material preparation, refiner by H 3 BO 3 、TiO 2 , aluminum powder, aluminum ingot, C 2 Cl 6 It is prepared with cryolite covering agent, in which the purity of aluminum ingot is 99.9%.

[0020] 2. Prepare 1Kg of refiner, weigh H as required 3 BO 3 、TiO 2 , aluminum powder, aluminum ingot, according to the aluminum burning rate of 3%, require TiO 2 :H 3 BO 3 : Al powder = 3: 4: 5 (mol), the rest is Al

[0021] 3 will H 3 BO 3 、TiO 2 The powder is heated at 300°C for two hours to remove the moisture.

[0022] 4. The heated TiO 2 and H 3 BO 3 Mix the mixture with aluminum powder evenly, put the evenly mixed powder in the mold, and press it into 70×Φ80mm 3 cylindrical powder block.

[0023] 5. Apply a layer of paint to tools such as molds and slag scrapers to prevent Fe impurity elements from contaminating the refiner. A graphite crucible is selected for s...

Embodiment 2

[0026] 1. Raw material preparation, refiner by H 3 BO 3 、TiO 2 , aluminum powder, aluminum ingot, C 2 Cl 6 It is prepared with cryolite covering agent, in which the purity of aluminum ingot is 99.9%.

[0027] 2. Prepare 500g of refiner, weigh H as required 3 BO 3 、TiO 2 , aluminum powder, aluminum ingots, the aluminum burning loss rate is 3%. Requires TiO 2 :H 3 BO 3 : Al powder = 1.3:2:2.5 (mol).

[0028] 3. H 3 BO 3 、TiO 2 The powder is heated at 300°C for two hours to remove the moisture.

[0029] 4. The heated TiO 2 and H 3 BO 3 Mix the mixture with aluminum powder evenly, put the evenly mixed powder in the mold, and press it into 90×Φ80mm 3 cylindrical powder block.

[0030] 5. Use a well-type resistance furnace to heat the cleaned aluminum ingot to 780°C. After the aluminum ingot is completely melted, cover it with a layer of cryolite to prevent the oxidation and gas absorption of aluminum; raise the furnace temperature to 950°C, and the graphite bell ...

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Abstract

The invention relates to a low-cost Al-Ti-B refiner and a preparation method thereof, and belongs to the technical field of the refiner. The refiner comprises, by mass, 3.0-6 .0% of Ti, 0.6-2%of B, and the balance being Al. Phase compositions of the refiner comprise [alpha]-Al, TiAl3 and TiB2. A ratio of TiO2 to H3BO3 to Al powder is (2.8-3.2) : (3.5-4.2) : (4.7-5.2) (mol), and purity of an aluminum ingot is 99.9%. The preparation method comprises the steps of firstly mixing TiO2 and H3BO3 uniformly, heating for two hours at a temperature of 300 DEG C; mixing the heated powder and the Al powder and placing the mixed powder in a mold, pressing the mixed powder into a block; heating the aluminum ingot to melt, covering cryolite, heating the melt, pressing the block into the melt, reacting with stirring, pressing into C2Cl6 for refining, drossing and pouring. The refiner utilizes low cost raw materials; the size of the prepared TiB2 is 1 [mu]m; the size of the prepared TiAl3 is 3-30 [mu]m; and the TiAl3 is distributed uniformly.

Description

technical field [0001] The invention belongs to the technical field of refiners, in particular to a low-cost refiner and a preparation method. Background technique [0002] At present, the refining agent widely used in the aluminum industry is Al-Ti-B intermediate alloy wire rod. Due to the backward production conditions and technical level, there is still a certain gap between the product and imported products, mainly reflected in the low B content and poor purity. The size, shape and distribution of the two phases are not up to standard. At present, a large number of Al-Ti-B master alloys are prepared industrially through the fluoride salt reaction method. The typical production process is: add K2TiF6 and KBF4 to the aluminum melt at 750-850 ° C, and fully react through mechanical stirring to prepare Al- Ti-B refiner. In the structure of the Al-Ti-B master alloy prepared by the fluoride salt reaction method, the TiAl3 phase is mostly agglomerated and needle-like, and the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/00C22C1/03
Inventor 陈子勇李贺马腾飞聂祚仁
Owner 大连科天新材料有限公司
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