CN101709383A

CN101709383A - High-efficiency environment-friendly additive for smelting aluminum alloy

Info

Publication number: CN101709383A
Application number: CN200910043757A
Authority: CN
Inventors: 于翔
Original assignee: YU XI ANG; YU XI'ANG
Current assignee: YU XI ANG; YU XI'ANG
Priority date: 2009-06-25
Filing date: 2009-06-25
Publication date: 2010-05-19

Abstract

The invention provides am additive for smelting aluminum and aluminum alloy, which comprises metal powder and a halogen salt fluxing agent. The invention is characterized in that a small amount of sulfur powder is used as an auxiliary fluxing agent, the additive comprises the following components: approximately 70-80% of metal powder, approximately 20-30% of sylvite and 0.03-1% of sulphur powder, wherein particles of the components are 80 meshes or so, and the sum of all the components are 100%. The metal powder can be one or more out of manganese, copper, iron, nickel, titanium and the like. As potassium fluoroaluminate is used as the fluxing agent of the sylvite, thus causing no damages to the production environment and the fitness of working people, thereby achieving the goal of environmental friendliness. The use of the moderate amount of sulphur powder provides a very good bonding effect to the medal powder, thereby effectively preventing the pulverization of the metal powder, simultaneously driving the additive to ascend or descend in the melt, and reducing the descent speed. Therefore, the smelting rate is improved by more than one time, and the recovery efficiency of the metal powder reaches more than 98%.

Description

A kind of high-efficiency environment-friendly additive for smelting aluminum alloy

Technical field

The invention belongs to the production of aluminum or aluminum alloy or the technical field of refining techniques field, particularly refined aluminum and aluminium alloy.

Background technology

In aluminium and alloy melting process, need to add the composition that metals such as iron, manganese, copper, titanium are adjusted aluminium alloy, the past is added above-mentioned element method commonly used in aluminium melting pond have:

(1), directly the blunt metal block that adds iron, manganese, copper, titanium etc., but since the fusing point of these several metals all more than 1000 ℃, more much higher than the temperature (720--760 ℃) of aluminium smelting furnace, fusing speed is slow under such temperature, so must take high-temperature operation;

(2), add master alloys such as aluminium-iron, aluminium-manganese, Solder for Al-Cu Joint Welding, aluminium-titanium.The fusing point of these master alloys helps the melting of aluminium alloy relatively near the temperature in the aluminium melting furnace.But during the preparation master alloy, still can run into because fusing point differs too big caused difficulty;

(3) external also useful granular metal and mixture salt are produced the method for master alloy, adopt granularity less than 400 microns granulated metal, with mixture salt compacting together, yet this powder agglomates that depresses to heavily about 100 grams with press at 1000 kilogram forces/cm2 pressure, owing to be easy to moisture absorption efflorescence, be not easy to store and transportation, in case after the moisture absorption, not only metal is easy to oxidizedly, and is not easy to throw in al molten bath.

(4), all there is certain deficiency for aspects such as the casting yield of metal, fusing speed, environmental protection though existing aluminium alloy additive is to a certain degree solving above-mentioned problems.

Summary of the invention

Improve metal casting yield and fusing speed in melting aluminium and the aluminium alloy process for solving, the invention provides a kind of additive of melting, it is made up of metal-powder, halogen fusing assistant, and the sulphur powder that it is characterized in that adopting trace is as auxiliary fusing assistant, and its constituent is:

(1) particle is that metal-powder about 80 orders accounts for 70%～80%,

(2) sylvite accounts for 20%～30%,

(3) SULPHUR POWDER accounts for 0.03%～1%.

Each composition summation is 100%

But one or more in above-mentioned metal-powder manganese, copper, iron, nickel, the titanium etc.

With sylvite as fusing assistant, its mechanism of action: reduce the melting temperature (Tm) of metal-powder when melting; The metal-powder oxidation be can prevent, metallic surface and aluminium liquid interface purified; Promote metal-powder fusion fast in smelting furnace.

The sylvite that is provided among the present invention is generally potassium cryolite, i.e. potassium fluoroaluminate.Potassium fluoroaluminate is made fusing assistant, has many advantages than aluminum fluosilicate (commonly used), can make the metal content of product more stable, can not add sodium and silicon this two elements, particularly sodium element, and is bigger to the influence of aluminium alloy; The more important thing is and adopt potassium fluoroaluminate, can not reach the purpose of environmental protection direct production staff's production environment and healthy generation injury as fusing assistant.

Among the present invention, in additive, add an amount of SULPHUR POWDER, be generally 0.03%～1% of total composition weight, by a large amount of experiments and test, after the adding SULPHUR POWDER, metal-powder has been played very big bonding effect, can effectively prevent the efflorescence of metal-powder, in the time of more making additive put into the aluminum or aluminum alloy liquation, because the fusing point of sulphur is very low, burning rapidly, produce bubble, scattering speeds up, and additive is risen and fallen up and down in liquation, alleviate lowering speed, thereby reach the purpose that improves fusing speed and metal-powder casting yield, the results showed, adopt this additive, fusing speed improves more than 1 times, and the metal-powder casting yield reaches more than 98%.

Additive provided by the present invention is compared with existing, has following remarkable advantage:

Operation when (1) making melting is easier, uses this product to be convenient to quicken the quick fusion and the raising metal-powder casting yield of refractory metal element.

(2) be convenient to store and transportation, under the normal circumstances, can preserve 12 months, can deterioration by oxidation, moisture absorption efflorescence.

Embodiment

This additive mainly is to have done significant improvement and raising on prescription, and its production technique and Production Flow Chart and existing additive preparation are basic identical.Concrete operations technology is, after the batching, is mixed, and carries out compaction moulding again in specific mould, packs after the moulding to get final product.

Claims

When melting aluminium of mainly forming by metal-powder, halogen and aluminium alloy as the additive that adds composition, the present invention is characterized in to adopt micro-sulphur as fusing assistant, to realize its purpose efficiently.Its major ingredient is (by weight): the metal-powder of particle about 80 orders accounts for 70%～80%, and sylvite accounts for 20%～30%, and SULPHUR POWDER accounts for 0.03%～1%, adds up to 100%.
2. an additive according to claim 1, it is characterized in that metal-powder can be manganese, titanium, iron, nickel, boron etc. one or more; Described sylvite is generally potassium fluoroaluminate.
3. an additive according to claim 1 is characterized in that containing 0.03%～1% SULPHUR POWDER.
4. an additive according to claim 1 is characterized in that all practicable unified formula rates of metal-powder such as all manganese, titanium, iron, nickel, boron, also can carry out proportioning according to user's requirement.