CN105316511A - Aluminum alloy refining agent and preparation method thereof - Google Patents

Abstract

The invention discloses an aluminum alloy refining agent. The aluminum alloy refining agent comprises, by weight, 70-80 parts of NaCl, 50-56 parts of KCl, 10-15 parts of MgCl2, 5-8 parts of LiCl, 30-36 parts of NaF, 10-12 parts of AlF3, 10-12 parts of sodium fluoroaluminate, 5-10 parts of carbon powder, 25-35 parts of light calcium carbonate, 20-25 parts of marble powder and 8-12 parts of CaO. By means of the aluminum alloy refining agent, the dehydrogenation effect is remarkable in the refining process, oxide inclusion in a melt can be removed sufficiently, warm slag is recycled more conveniently, and the recovery rate is higher.

Description

A kind of aluminum refining agent and preparation method thereof

Technical field

The present invention relates to aluminium alloy smelting manufacture field, particularly a kind of aluminum refining agent and preparation method thereof.

Background technology

Along with scientific and technical and industrial development, particularly Aeronautics and Astronautics, ballistic missile and electronic industrial technology etc. develop rapidly, the specification of quality increasingly stringent of society to Aluminum-aluminum alloy.The guarantee and the prerequisite that obtain fine aluminum alloy-steel casting obtain clean aluminium alloy melt, and melt refining obtains the most frequently used and one of the most effective means of clean liquid metal.

Al and Alalloy cleaning molten method has filtration, purification, non-adsorbed to purify and the large class of adsorption cleaning.Wherein filtration, purification treatment capacity is little, and need regularly replace filtration medium, running cost is higher; Non-adsorbed purification mainly contains vacuum purification method, ultrasonic purification method and electromagnetic purification method, but facility investment is large, and running cost is high; Adsorption cleaning mainly contains gas refinement method and the refining agent method of purification, and wherein the refining agent method of purification is due to easy handling, cheap, and the advantages such as good purification are widely applied in actual production.

Alloy refining belongs to adsorption cleaning more, as adopted C ₂cl ₆this malicious refining agent.Authorization Notice No. be CN101343699B patent discloses a kind of aluminum-silicon alloy refining agent, the proportioning of its raw material is: Repone K is 15 ~ 30%, sodium-chlor 15 ~ 30%, zinc chloride 2 ~ 8%, sodium fluoroaluminate 2 ~ 8%, Sodium Silicofluoride 2 ~ 8%, SODIUMNITRATE 5 ~ 15%, Graphite Powder 99 0.5 ~ 2%, wooden carbon dust 1 ~ 10%, hexachloroethane 5 ~ 15%, Sodium tetrafluoroborate 1 ~ 10%, potassium fluotitanate 1 ~ 10%; This refining agent have employed hexachloroethane, can produce chlorine after pyroreaction, to environment generation disadvantageous effect to a certain degree.

Summary of the invention

The invention provides a kind of aluminum refining agent and preparation method thereof, the aluminum refining agent degasification good impurity removing effect of gained.

For achieving the above object, technical scheme of the present invention is:

A kind of aluminum refining agent, comprises the raw material of following weight part: NaCl70 ~ 80 part, KCl50 ~ 56 part, MgCl ₂10 ~ 15 parts, LiCl5-8 part, NaF30 ~ 36 part, AlF ₃10 ~ 12 parts, sodium fluoroaluminate 10 ~ 12 parts, carbon dust 5 ~ 10 parts, light calcium carbonate 25 ~ 35 parts, marble flour 20 ~ 25 parts, CaO8 ~ 12 part.

Preferably, described refining agent comprises the raw material of following weight part: NaCl75 part, KCl53 part, MgCl ₂12 parts, LiCl7 part, NaF33 part, AlF ₃11 parts, sodium fluoroaluminate 11 parts, carbon dust 8 parts, light calcium carbonate 30 parts, marble flour 22 parts, CaO10 part.

A preparation method for aluminum refining agent, comprises the following steps:

S1, each raw material to be pulverized respectively, and cross 60-80 object screen cloth;

S2, raw material obtained for step S1 is put into stirrer by weight ratio, fully mix, obtained uniform mixture;

S3, uniform mixture obtained for step S2 is put into baking oven or drum-type drying bucket, at 100 ± 5 DEG C, baking 2-3 hour;

S4, by step S3 toast after uniform mixture sieve with 80 object screen clothes, be cooled to 40 DEG C, sealed packaging namely obtain aluminum refining agent finished product.

What said components raw material played respectively act as:

NaCl and KCl: to solid-state Al ₂o ₃, inclusion and oxide film have very strong wetting capacity, and the proportion of NaCl and KCl only has 1.55g/cm under smelting temperature ³l.50g/cm ³, be significantly less than the proportion of molten aluminium, therefore aluminium alloy melt surface can be spread over well, the broken oxide film with adsorbing bath surface;

K ₂cO ₃: sweetening agent and foaming substance, also can play the effect of fluxing;

MgCl ₂and LiCl: muriate, surface tension is little, and wettability is good, with NaCl and KCl with the use of;

NaF, AlF ₃and sodium fluoroaluminate: mainly play refining effect, as absorption, dissolve Al ₂o ₃; Villiaumite can also remove the oxide film of bath surface effectively, improves degassing effect;

Carbon dust: reductor, and carbon dust add can extend foaming time, make refining effect better;

Marble flour and light calcium carbonate: the whipping agent of high-quality, sweetening agent, marble flour can improve the thickness of foam;

CaO: adjustable basicity of slag, sweetening agent;

When aluminum refining agent of the present invention is used for refining aluminium alloy, be blown in smelting furnace with the use of nitrogen or argon gas, can obtain good dehydrogenation effect, its advantage comprises:

(1) dehydrogenation Be very effective, H content can drop to the level of about 0.10 ~ 0.16ml/100gAl;

(2) fully can remove the oxide inclusion in melt, slagging-off rate can reach more than 90%; And warm sludge reclaims more convenient, the rate of recovery is higher;

(3) scaling loss of metal can effectively be reduced;

(4) preparation technology is simple, and raw material sources are extensive, are convenient to large-scale production.

Embodiment

Below in conjunction with specific embodiment, the invention will be further described, but protection scope of the present invention and range of application are not limited to following examples:

Embodiment 1

A kind of aluminum refining agent, comprises the raw material of following weight part: NaCl75 part, KCl53 part, MgCl ₂12 parts, LiCl7 part, NaF33 part, AlF ₃11 parts, sodium fluoroaluminate 11 parts, carbon dust 8 parts, light calcium carbonate 30 parts, marble flour 22 parts, CaO10 part.

The preparation method of above-mentioned aluminum refining agent, comprises the following steps: S1, pulverized respectively by each raw material, and crosses 60-80 object screen cloth; S2, raw material obtained for step S1 is put into stirrer by weight ratio, fully mix, obtained uniform mixture; S3, uniform mixture obtained for step S2 is put into baking oven or drum-type drying bucket, at 100 ~ 105 DEG C, baking 2-3 hour; S4, by step S3 toast after uniform mixture sieve with 80 object screen clothes, be cooled to 40 degree, sealed packaging namely obtain aluminum refining agent finished product.

When using above-mentioned aluminum refining agent refining aluminium alloy, the add-on of refining agent is 3g/kg liquation, and the H content of molten aluminium can drop to the level of about 0.10 ~ 0.13ml/100gAl; Fully can remove the oxide inclusion in melt, slagging-off rate can reach more than 93%; This molten aluminium alloy pours into aluminum alloy casting, evaluates according to GB/T7946.3-1999, and pinhole rate is 1 grade, average aperture size <0.02mm.

Embodiment 2

A kind of aluminum refining agent, comprises the raw material of following weight part: NaCl70 part, KCl50 part, MgCl ₂10 parts, LiCl5 part, NaF36 part, AlF ₃12 parts, sodium fluoroaluminate 12 parts, carbon dust 5 parts, light calcium carbonate 35 parts, marble flour 25 parts, CaO12 part.

The preparation method of above-mentioned aluminum refining agent, comprises the following steps: S1, pulverized respectively by each raw material, and crosses 60-80 object screen cloth; S2, raw material obtained for step S1 is put into stirrer by weight ratio, fully mix, obtained uniform mixture; S3, uniform mixture obtained for step S2 is put into baking oven or drum-type drying bucket, at 95 ~ 100 DEG C, baking 2-3 hour; S4, by step S3 toast after uniform mixture sieve with 80 object screen clothes, be cooled to 40 degree, sealed packaging namely obtain aluminum refining agent finished product.

When using above-mentioned aluminum refining agent refining aluminium alloy, the add-on of refining agent is 3g/kg liquation, and the H content of molten aluminium can drop to the level of about 0.11 ~ 0.14ml/100gAl; Fully can remove the oxide inclusion in melt, slagging-off rate can reach more than 90%; This molten aluminium alloy pours into aluminum alloy casting, evaluates according to GB/T7946.3-1999, and pinhole rate is 1 grade, average aperture size <0.05mm.

Embodiment 3

A kind of aluminum refining agent, comprises the raw material of following weight part: NaCl80 part, KCl56 part, MgCl ₂15 parts, LiCl8 part, NaF30 part, AlF ₃10 parts, sodium fluoroaluminate 10 parts, carbon dust 10 parts, light calcium carbonate 25 parts, marble flour 20 parts, CaO8 part.

The preparation method of above-mentioned aluminum refining agent, comprises the following steps: S1, pulverized respectively by each raw material, and crosses 60-80 object screen cloth; S2, raw material obtained for step S1 is put into stirrer by weight ratio, fully mix, obtained uniform mixture; S3, uniform mixture obtained for step S2 is put into baking oven or drum-type drying bucket, at 100 ~ 105 DEG C, baking 2-3 hour; S4, by step S3 toast after uniform mixture sieve with 80 object screen clothes, be cooled to 40 degree, sealed packaging namely obtain aluminum refining agent finished product.

When using above-mentioned aluminum refining agent refining aluminium alloy, the add-on of refining agent is 3g/kg liquation, and the H content of molten aluminium can drop to the level of about 0.12 ~ 0.16ml/100gAl; Fully can remove the oxide inclusion in melt, slagging-off rate can reach more than 90%; This molten aluminium alloy pours into aluminum alloy casting, evaluates according to GB/T7946.3-1999, and pinhole rate is 1 grade, average aperture size <0.05mm.

Claims (3)

1. an aluminum refining agent, is characterized in that:

Described refining agent comprises the raw material of following weight part: NaCl70 ~ 80 part, KCl50 ~ 56 part, MgCl ₂10 ~ 15 parts, LiCl5-8 part, NaF30 ~ 36 part, AlF ₃10 ~ 12 parts, sodium fluoroaluminate 10 ~ 12 parts, carbon dust 5 ~ 10 parts, light calcium carbonate 25 ~ 35 parts, marble flour 20 ~ 25 parts, CaO8 ~ 12 part.

2. aluminum refining agent according to claim 1, is characterized in that:

Described refining agent comprises the raw material of following weight part: NaCl75 part, KCl53 part, MgCl ₂12 parts, LiCl7 part, NaF33 part, AlF ₃11 parts, sodium fluoroaluminate 11 parts, carbon dust 8 parts, light calcium carbonate 30 parts, marble flour 22 parts, CaO10 part.

3. a preparation method for aluminum refining agent according to claim 1 and 2, is characterized in that comprising the following steps:

S1, each raw material to be pulverized respectively, and cross 60-80 object screen cloth;

S2, raw material obtained for step S1 is put into stirrer by weight ratio, fully mix, obtained uniform mixture;

S3, uniform mixture obtained for step S2 is put into baking oven or drum-type drying bucket, at 100 ± 5 DEG C, baking 2-3 hour;

S4, by step S3 toast after uniform mixture sieve with 80 object screen clothes, be cooled to 40 DEG C, sealed packaging namely obtain aluminum refining agent finished product.