阅读说明：本技术 一种铝合金用复合型镍元素添加剂 (Composite nickel element additive for aluminum alloy ) 是由 马涛 马明明 赵卫涛 张娟 杨烁 王红伟 田新乐 李伟 娄月 张苹 范建海 王 于 2020-12-25 设计创作，主要内容包括：本发明涉及一种铝合金用复合型镍元素添加剂,其组分及质量百分含量为：雾化镍粉60～95％；铝粉1～20％；氟化钙2～8％；氟硅酸钠0～8％；碳酸钙0～8％；氟铝酸钾1～36.7％；微晶石蜡粉0.2～0.6％；乙二胺双硬脂酰胺0.1～0.5％；将混合好的物料通过液压机压制成圆饼状,单块重量在500～1500克,密度4.0～5.5g/cm～3。本发明的复合型镍元素添加剂在700～740℃条件下,Ni含量在0.5～2.3％时,8～20分钟可以达到96％以上的实收率,杂质含量低,熔化速度快,实收率高,烟气量小,安全性好。(The invention relates to a composite nickel element additive for aluminum alloy, which comprises the following components in percentage by mass: 60-95% of atomized nickel powder; 1-20% of aluminum powder; 2-8% of calcium fluoride; 0-8% of sodium fluosilicate; 0-8% of calcium carbonate; 1-36.7% of potassium fluoroaluminate; 0.2-0.6% of microcrystalline wax powder; 0.1-0.5% of ethylenediamine bisstearamide; pressing the mixed materials into round cakes by a hydraulic press, wherein the weight of each block is 500-1500 g, and the density is 4.0-5.5 g/cm 3 . The composite nickel element additive disclosed by the invention has the advantages that under the condition of 700-740 ℃, when the Ni content is 0.5-2.3%, the actual yield of more than 96% can be achieved in 8-20 minutes, the impurity content is low, the melting speed is high, the actual yield is high, the smoke amount is small, and the safety is good.)

1. A composite nickel element additive for aluminum alloy comprises the following components in percentage by mass:

60-95% of atomized nickel powder;

1 to 20 percent of aluminum powder

2-8% of calcium fluoride;

0-8% of sodium fluosilicate;

0-8% of calcium carbonate;

1-36.7% of potassium fluoroaluminate;

0.2 to 0.6 percent of microcrystalline wax powder

0.1-0.5% of ethylenediamine bisstearamide;

pressing the mixed materials into round cakes by a hydraulic press, wherein the weight of each block is 500-1500 g, and the density is 4.0-5.5 g/cm³。

2. The composite nickel element additive for aluminum alloys according to claim 1, wherein: the Ni content of the atomized nickel powder is more than or equal to 99.5 percent, and the hydrogen loss is less than or equal to 0.3 percent; the granularity is as follows: 20-150 meshes; apparent density: 3.0-4.0g/cm³(ii) a The water content is less than or equal to 0.05 percent.

3. The composite nickel element additive for aluminum alloys according to claim 1, wherein: the composition comprises the following components in percentage by mass: 75% of atomized nickel powder; 5% of aluminum powder; 3.5 percent of calcium fluoride; 3% of sodium fluosilicate; 2% of calcium carbonate; 10.9 percent of potassium fluoroaluminate; microcrystalline wax powder 0.4%; 0.2 percent of ethylenediamine bisstearamide.

4. The composite nickel element additive for aluminum alloys according to claim 1, wherein: aluminum powder with purity more than or equal to 99.7 percent and granularity: 30-150 meshes; calcium fluoride, sodium fluosilicate, calcium carbonate, potassium fluoroaluminate, microcrystalline paraffin powder and ethylenediamine bisstearamide are all in industrial grade, the purity is more than or equal to 98 percent, and the granularity is as follows: 30-325 meshes.

Technical Field

The invention belongs to the field of aluminum alloy, relates to an aluminum alloy additive, and particularly relates to a composite nickel element additive for aluminum alloy and a production method thereof.

Background

The industrial pure aluminum has good performances of electric conduction, heat conduction, corrosion resistance, plastic processing and the like, can be processed into plates, strips, foils, extruded products and the like, but has lower mechanical properties, and the mechanical properties of tensile strength, hardness and the like can be obviously improved by adding alloy elements into the aluminum to prepare the aluminum alloy. Nickel (Ni) is one of the important alloying elements of aluminum alloys in which NiAl can be formed₃And the intermetallic compounds improve the hardness, the high-temperature strength, the volume and the dimensional stability of the alloy, and tend to change the compound of the iron element (Fe) into blocks, namely reduce the harmful effect of the impurity element iron (Fe) and improve the welding performance of the alloy.

The melting point of nickel is 1453 deg.C, 793 deg.C higher than 660 deg.C, and the density is 8.90g/cm³Specific density of aluminum 2.70g/cm³Height of 6.20g/cm³If pure metallic nickel is directly added into an aluminum melt, the melting temperature needs to be increased, the melting time needs to be prolonged, and component segregation is easy to cause, the pure metallic nickel is generally added in the form of Al-Ni intermediate alloy at present, but the Ni content is generally within 20%, the energy consumption is high during melting, the loss is large, and the use cost is also high. Compared with Al-Ni intermediate alloy, the nickel element additive has high effective content, NiThe content is generally 75% or more, the consumption of the same element content can be reduced by more than 73% compared with the intermediate alloy, and the alloy has the advantages of low transportation, storage and use cost and the like.

Presently, the disclosed elemental nickel additives generally consist of nickel powder and a fluxing agent. For example, the Chinese invention patent CN111235416A discloses a high-efficiency green aluminum alloy additive and a preparation method and application thereof, which comprises metal powder and high-activity superfine aluminum powder, wherein the mass percent of the metal powder is 70-90%, and the balance is the high-activity superfine aluminum powder, one of the metal powder is nickel powder which can be used for adding nickel element; chinese invention patent CN111270096A discloses an efficient environment-friendly aluminum alloy additive and a preparation method and application thereof, which consists of metal powder and cosolvent, wherein the mass percent of the metal powder is 70-90%, the rest is the cosolvent, one of the metal powder is nickel powder which can be used for adding nickel element; the Chinese invention patent CN 101709383A discloses an efficient environment-friendly aluminum alloy smelting additive, which mainly comprises metal powder, potassium salt and sulfur powder, wherein the metal powder refers to nickel metal powder.

The presently disclosed patents suffer from one or more of the following drawbacks: firstly, only nickel powder is used as a raw material of one element additive, the purity and the granularity of the nickel powder are specified, but the preparation process of the nickel powder is not determined, the purity of the nickel powder in the embodiment 5 of the Chinese invention patent CN111270096A is only 92.30 percent, the nickel powder is nickel alloy powder, the problems of low purity and high impurity content exist, and the application performance indexes such as the melting speed of the nickel element additive and the like are not specified; ② the fluxing agent of the Chinese invention patent CN111270096A comprises KCl and MgCl₂、KAlF₄Wherein KCl, MgCl₂The flux used as the additive is very easy to absorb moisture and deliquesce in the production and storage processes, and can cause the danger of explosion after being put into a melting furnace; the invention patent CN111235416A only mentions the purity and granularity of metal powder and aluminum powder, no nickel additive is provided, and the aluminum powder is-325 mesh ultra-fine aluminum powder, which is easy to scatter into the air during the production process of mixing and discharging, so that the danger of explosion of aluminum powder dust is generated, and the aluminum dust also harms human bodyHealth care; fourthly, the sulfur powder contained in the Chinese invention patent CN 101709383A is added into the aluminum liquid and then burnt to generate obvious pungent smell, and the environmental protection is poor. The nickel element additive is single type, or fluxing agent type, or aluminum type, wherein the smoke volume of the single fluxing agent type is relatively large, the melting performance of the single aluminum type is poor, and the melting time is relatively longer.

Disclosure of Invention

The invention aims to overcome the defects of the prior art, provides the composite nickel element additive for the aluminum alloy, which is fast in melting, low in impurity, non-hygroscopic, safe and environment-friendly, and overcomes the defects of the nickel element additive in the prior art in the aspects of melting speed, purity, hygroscopicity, safety, environment friendliness and the like.

The technical scheme adopted by the invention for solving the technical problem is as follows:

a composite nickel element additive for aluminum alloy comprises the following components in percentage by mass:

60-95% of atomized nickel powder;

1 to 20 percent of aluminum powder

2-8% of calcium fluoride;

0-8% of sodium fluosilicate;

0-8% of calcium carbonate;

1-36.7% of potassium fluoroaluminate;

0.2 to 0.6 percent of microcrystalline wax powder

0.1-0.5% of ethylenediamine bisstearamide;

pressing the mixed materials into round cakes by a hydraulic press, wherein the weight of each block is 500-1500 g, and the density is 4.0-5.5 g/cm³。

Moreover, the Ni content of the atomized nickel powder is more than or equal to 99.5 percent, and the hydrogen loss is less than or equal to 0.3 percent; the granularity is as follows: 20-150 meshes; apparent density: 3.0-4.0g/cm³(ii) a The water content is less than or equal to 0.05 percent.

Moreover, the components and the mass percentage content are as follows: 75% of atomized nickel powder; 5% of aluminum powder; 3.5 percent of calcium fluoride; 3% of sodium fluosilicate; 2% of calcium carbonate; 10.9 percent of potassium fluoroaluminate; microcrystalline wax powder 0.4%; 0.2 percent of ethylenediamine bisstearamide.

And the purity of the aluminum powder is more than or equal to 99.7 percent, and the granularity is as follows: 30-150 meshes.

In addition, the calcium fluoride, the sodium fluosilicate, the calcium carbonate, the potassium fluoroaluminate, the microcrystalline paraffin powder and the ethylenediamine bisstearamide are all in industrial grade, the purity is more than or equal to 98 percent, and the granularity is as follows: 30-325 meshes.

The nickel powder can be divided into carbonyl nickel powder, reduced nickel powder, electrolytic nickel powder, atomized nickel powder and the like according to different production processes, wherein the carbonyl nickel powder is the nickel powder produced by a carbonyl method, is gray or gray black irregular powder, is easy to oxidize in humid air, has toxicity, and is mainly used for powder metallurgy, conductive paste, silica gel, batteries, catalysts and the like; the reduced nickel powder is prepared by reducing nickel oxide by hydrogen, is light gray spherical powder and is mainly used for alloy structural steel, nickel-based friction materials, nickel-containing magnetic materials and the like; the electrolytic nickel powder is prepared by roasting sulfide ore containing nickel into oxide, reducing the oxide into crude nickel by using carbon, and electrolyzing the crude nickel to obtain gray black irregular dendritic powder, and is mainly applied to the fields or industries of hard alloy, diamond tools, alkaline storage batteries, anti-corrosion pigments, magnetic materials, powder metallurgy parts, catalysts, automobile manufacturing, atomic energy industry, aerospace and the like. The above 3 kinds of nickel powder are fine powder of-200 mesh or-300 mesh, and are easy to be oxidized and burnt, and the danger of using them in nickel additive production is high. The nickel alloy powder is prepared by taking recycled nickel alloy parts, machining chips and the like as raw materials, the purity of the nickel alloy powder is generally not more than 95%, and the main impurity elements are Cr, Fe, Cu, Mn and the like.

The nickel powder used in the invention is atomized nickel powder, and is produced by adopting two processes of water atomization and gas atomization, electrolytic nickel is used as a raw material, and the nickel powder is prepared by the working procedures of atomization, filtering and drying, reduction, screening, batch combination, packaging and the like after being melted. The atomized nickel powder is in a silver-gray irregular spherical shape, has a large specific surface area and is high in melting speed; when the granularity of the nickel powder is too coarse, the nickel element additive is not easy to be pressed and formed, the components are not uniform, the melting speed is slow, when the granularity is too fine, the oxidation combustion is easy to occur, the burning loss is increased, and the actual yield of the nickel element additive is reduced. The preferred nickel powder quality standard in the invention is as follows: the components of: ni content is more than or equal to 99.5 percent, hydrogen loss is less than or equal to 0.3 percent, and the impurity content of other single metal elementsLess than or equal to 0.04 percent; particle size: 20-150 meshes, wherein the proportion of the 20 meshes above the sieve to the 150 meshes below the sieve is less than or equal to 5 percent; ③ apparent density: 3.0-4.0g/cm³(ii) a Fourthly, the water content is less than or equal to 0.05 percent.

In the invention, the potassium fluoroaluminate has the functions of dispersing and surface modifying, promotes the dispersion of the nickel powder, melts the oxide on the surface of the nickel powder and improves the melting performance; the calcium fluoride has the functions of adsorbing potassium fluoroaluminate after the potassium fluoroaluminate plays roles of dispersing and surface modifying, reducing smoke volatilization, improving slag aluminum separation effect and playing a role in cooperation with the potassium fluoroaluminate; the sodium fluosilicate has the functions of decomposing and releasing heat and promoting the diffusion and melting of nickel powder; the calcium carbonate has the functions of releasing heat, increasing local temperature and accelerating the melting of nickel powder; the function of the aluminum powder is to form partial particle groups of the nickel powder and the aluminum powder after being mixed with the nickel powder, the partial particle groups generate exothermic reaction preferentially after the aluminum liquid is added, and NiAl is generated₃The particle and local temperature are increased, the reaction is further accelerated, and under the synergistic action of the salt dispersant, the composite nickel element additive is rapidly dissolved and diffused layer by layer and is absorbed by the aluminum liquid, so that alloying is completed; the microcrystalline wax powder has the functions of hydrophobicity and moisture resistance, and a layer of hydrophobic protective film is formed on the surface of the product to inhibit the moisture absorption of the product; the ethylenediamine bisstearamide has the function of lubricating and improving the formability of the product.

Aluminum powder with purity more than or equal to 99.7 percent and granularity: 30-150 meshes.

Calcium fluoride, sodium fluosilicate, calcium carbonate, potassium fluoroaluminate, microcrystalline paraffin powder and ethylenediamine bisstearamide are all in industrial grade, the purity is more than or equal to 98 percent, and the granularity is as follows: 30-325 meshes.

The production method of the composite nickel element additive comprises the following steps: materials meeting the requirements are proportioned according to the formula of the invention, each batch is proportioned to be 500-1500 kg, and the materials are put into a mixer to be mixed for 20-40 minutes. Pressing the mixed materials into round cakes by a hydraulic press, wherein the weight of a single block is 500-1500 g, and the density is 4.0-5.5 g/cm³And packaging by adopting aluminum foil and paper boxes.

The invention has the advantages and positive effects that:

the composite nickel element additive is produced by using the atomized nickel powder, the atomized nickel powder has low impurity content and high cost performance, and the nickel element additive prepared by optimizing the granularity and the apparent density of the nickel powder has the advantages of good formability, high melting speed, high practical yield, good safety and no toxic or harmful action, and can meet the production and quality requirements of the nickel element additive under industrial conditions.

Secondly, the composite nickel element additive is prepared from a salt dispersant and aluminum powder, wherein the salt dispersant is mainly potassium fluoroaluminate, and calcium fluoride, sodium fluorosilicate, calcium carbonate and the like are added to form a non-hygroscopic, safe and environment-friendly dispersant, the dispersant can be rapidly diffused and decomposed after being added into aluminum liquid to release heat, so that nickel powder is rapidly dispersed into the aluminum liquid to be melted, and a better slag aluminum separation effect is achieved during use. The aluminum powder can generate exothermic reaction with the nickel powder, and is rapidly melted and diffused layer by layer under the synergistic action of the salt dispersant, and is absorbed by the aluminum liquid to complete alloying. The composite nickel element additive is not easy to absorb moisture, deliquesce and explode in the production and normal storage processes, and the safety of the product is improved.

The composite nickel element additive of the invention takes microcrystalline wax powder as a hydrophobic and moisture-proof agent to reduce the hygroscopicity.

And fourthly, under the condition of 700-740 ℃, when the Ni content of the composite nickel element additive is 0.5-2.3%, the actual yield of the composite nickel element additive can reach more than 96% in 8-20 minutes.

Compared with the conventional single fluxing agent type or single aluminum type nickel element additive, the composite nickel element additive has the advantages of higher melting speed, low impurity content, high actual yield, small smoke amount and good safety.

Detailed Description

The present invention is further illustrated by the following specific examples, which are intended to be illustrative, not limiting and are not intended to limit the scope of the invention.

Example 1:

the composite nickel element additive for aluminum alloy consists of water atomized nickel powder 60 wt%, aluminum powder 10 wt%, calcium fluoride 7 wt%, calcium carbonate 8 wt%, potassium fluoroaluminate 14.3 wt%, microcrystalline wax powder 0.3 wt% and ethylenediamine bisstearamide 0.4 wt%.

Materials meeting the requirements are proportioned according to the formula of the invention, each batch is proportioned to 600 kg, and the materials are put into a mixer to be mixed for 20 minutes. Then, the mixed materials are pressed into round cakes by a hydraulic press, the weight of each block is 500 +/-10 g, and the density: 4.2-4.4g/cm³And detecting the components, the density and the moisture of the prepared nickel element additive, wrapping the nickel element additive by using an aluminum foil after the detection is qualified, and packaging the nickel element additive by 2.5 kg/bag and 20 kg/carton.

The composite nickel element additive prepared according to the embodiment 1 is used for adding nickel element into 4032 wrought aluminum alloy, the adding temperature is 722 ℃, the adding amount is 1%, the Ni content in the alloy is 0.60%, the mixture is uniformly stirred after being added for 8 minutes, sampling detection shows that the detected value of the Ni content is 0.58086%, the actual yield is 96.8%, the slag-aluminum separation effect is good, the smoke amount is small, and the alloy standard is met.

The composite nickel element additive prepared according to the embodiment 1 is placed under the conventional temperature and humidity conditions (the temperature is 10-35 ℃, and the relative humidity is 20-90%) for 6 months, and the surface has no moisture absorption and deliquescence phenomena.

Example 2:

a composite nickel element additive for aluminum alloy comprises 75% of atomized nickel powder by weight percent; 5% of aluminum powder; 3.5 percent of calcium fluoride; 3% of sodium fluosilicate; 2% of calcium carbonate; 10.9 percent of potassium fluoroaluminate; microcrystalline wax powder 0.4%; 0.2 percent of ethylenediamine bisstearamide.

Materials meeting the requirements are proportioned according to the formula of the invention, 1000 kg of the materials are proportioned in each batch, and the materials are put into a mixer for mixing for 30 minutes. Then, the mixed materials are pressed into round cakes by a hydraulic press, the weight of each block is 500 +/-10 g, and the density: 4.6-4.8g/cm³And detecting the components, the density and the moisture of the prepared nickel element additive, wrapping the nickel element additive by using an aluminum foil after the detection is qualified, and packaging the nickel element additive by 2.5 kg/bag and 20 kg/carton.

The composite nickel element additive prepared according to the embodiment 2 is used for adding nickel element into 8001 wrought aluminum alloy, the adding temperature is 720 ℃, the adding amount is 1.493%, the Ni content in the alloy is 1.12%, the mixture is uniformly stirred after being added for 12 minutes, sampling detection shows that the detected value of the Ni content is 1.09312%, the actual yield is 97.6%, the slag-aluminum separation effect is good, the smoke amount is small, and the alloy standard is met.

The composite nickel element additive prepared according to the embodiment 2 is placed under the conventional temperature and humidity conditions (the temperature is 10-35 ℃, and the relative humidity is 20-90%) for 6 months, and the surface has no moisture absorption and deliquescence phenomena.

Example 3:

a composite nickel element additive for aluminum alloy contains 90% of nickel, 90% of water-atomized nickel powder, 3.0% of aluminum powder, 2% of calcium fluoride, 1% of sodium fluosilicate, 3.5% of potassium fluoroaluminate, 0.3% of microcrystalline paraffin powder and 0.2% of ethylenediamine bisstearamide.

Materials meeting the requirements are proportioned according to the formula of the invention, 1500 kg of the materials are proportioned in each batch, and the materials are put into a mixer for mixing, wherein the mixing time is 40 minutes. Then, the mixed materials are pressed into round cakes by a hydraulic press, the weight of each block is 1000 +/-10 g, and the density: 5.0-5.2g/cm³And detecting the components, the density and the moisture of the prepared nickel element additive, wrapping the nickel element additive by using an aluminum foil after the detection is qualified, and packaging the nickel element additive by 3 kg/bag and 24 kg/carton.

The composite nickel element additive prepared according to the embodiment 3 is used for adding nickel element into 2218 wrought aluminum alloy, the adding temperature is 727 ℃, the adding amount is 2.256%, the Ni content in the alloy is 2.03%, the mixture is uniformly stirred after being added for 16 minutes, sampling detection shows that the Ni content detection value is 1.95692%, the actual yield is 96.4%, the slag-aluminum separation effect is good, the smoke amount is small, and the alloy standard is met.

The composite nickel element additive prepared according to the embodiment 3 is placed under the conventional temperature and humidity conditions (the temperature is 15-35 ℃, and the relative humidity is 30-90%) for 6 months, and the surface has no moisture absorption and deliquescence phenomena.

Comparative example 1:

the nickel element additive for aluminum alloy contains nickel 60 wt%, electrolytic nickel powder 60 wt%, calcium fluoride 7 wt%, calcium carbonate 8 wt%, potassium fluoroaluminate 24.3 wt%, microcrystalline wax powder 0.3 wt% and ethylenediamine bisstearamide 0.4 wt%.

Materials meeting the requirements are proportioned according to the formula of the invention, each batch is proportioned to 600 kg, and the materials are put into a mixer to be mixed for 20 minutes. Then, the mixed materials are pressed into round cakes by a hydraulic press, the weight of each block is 500 +/-10 g, and the density: 4.2-4.4g/cm³And detecting the components, the density and the moisture of the prepared nickel element additive, wrapping the nickel element additive by using an aluminum foil after the detection is qualified, and packaging the nickel element additive by 2.5 kg/bag and 20 kg/carton.

The nickel element additive prepared according to the comparative example 1 is used for adding nickel element into 4032 wrought aluminum alloy, the adding temperature is 721 ℃, the adding amount is 1%, the Ni content in the alloy is 0.60%, the stirring is uniform after the adding is carried out for 10 minutes, the sampling detection shows that the Ni content detection value is 0.55321%, the actual yield is 92.2%, the stirring is carried out again after the adding is carried out for 20 minutes, the sampling detection shows that the Ni content detection value is 0.55205%, the actual yield is 92.0%, and the stable actual yield is achieved after 10 minutes. In addition, according to the comparison of the same-period price, the electrolytic nickel powder is about 1 ten thousand yuan/ton higher than the water-atomized nickel powder, but the actual yield of the prepared nickel element additive with the content of 60 percent is about 4.6 percent lower than that of the water-atomized nickel powder.

Comparative example 1 shows that the electrolytic nickel powder is not suitable for the production of nickel additive, the selection of the nickel powder has obvious influence on the actual yield and the material cost, and the atomized nickel powder determined by the invention has comprehensive advantages in the aspects of cost, actual yield, melting speed and the like.

Comparative example 2:

a nickel element additive for aluminum alloy contains nickel 75%, nickel alloy powder (purity 92.30%, Cr 6.80%, granularity 20-200 meshes) 81.3%, calcium fluoride 4.5%, sodium fluosilicate 3%, calcium carbonate 2%, potassium fluoroaluminate 8.6%, microcrystalline wax powder 0.4%, and ethylenediamine bisstearamide 0.2%. Materials meeting the requirements are prepared according toThe ingredients are mixed according to the formula proportion, each batch is 1000 kg, and the materials are put into a mixer for mixing for 30 minutes. Then, the mixed materials are pressed into round cakes by a hydraulic press, the weight of each block is 500 +/-10 g, and the density: 4.6-4.8g/cm³And detecting the components, the density and the moisture of the prepared nickel element additive, wrapping the nickel element additive by using an aluminum foil after the detection is qualified, and packaging the nickel element additive by 2.5 kg/bag and 20 kg/carton.

The nickel element additive prepared according to the comparative example 2 is used for adding the nickel element into the 8001 wrought aluminum alloy, the adding temperature is 722 ℃, the adding amount is 1.467%, the Ni content in the alloy is 1.10%, the mixture is uniformly stirred after being added for 15 minutes, and sampling detection shows that the Ni content is 0.98561%, and the actual yield is 89.6%; stirring again after 20 minutes, sampling and detecting, wherein the detected value of Ni content is 1.03625%, the actual yield is 94.2%, and the Cr content is 0.07786%, wherein the Cr content exceeds the requirement that the Cr content of 8001 alloy is less than or equal to 0.05% in the national standard GB/T3190-2008 deformed aluminum and aluminum alloy compositions, and the product quality is reduced or the scrap is caused by the excessive impurities.

Comparative example 2 shows that the low-purity alloy nickel powder is not suitable for the production of nickel element additives, so that the impurity elements in the used product exceed the standard, the selection of the nickel powder has obvious influence on the quality conformity of the customer products, and the atomized nickel powder determined by the invention has comprehensive advantages in the aspects of purity, melting speed, actual yield and the like.

Comparative example 3:

a nickel additive for aluminium alloy contains nickel (75%), Ni alloy powder (92.30% purity, 6.80% Cr as main impurity element, 20-200 meshes) 81.3%, potassium chloride 5%, magnesium chloride 5% and potassium fluoroaluminate 8.7%.

Materials meeting the requirements are proportioned according to the formula of the invention, 1000 kg of the materials are proportioned in each batch, and the materials are put into a mixer for mixing for 30 minutes. Then, the mixed materials are pressed into round cakes by a hydraulic press, the weight of each block is 500 +/-10 g, and the density: 4.6-4.8g/cm³The prepared nickel element additiveAnd detecting the components, the density and the moisture, wrapping the qualified product by using an aluminum foil, and packaging the product according to 2.5 kg/bag and 20 kg/carton.

The nickel element additive prepared according to the comparative example 3 is placed for 3 days under the conventional temperature and humidity conditions (the temperature is 15-35 ℃, and the relative humidity is 30-90%), and the phenomena of moisture absorption and deliquescence appear on the surface, so that the nickel element additive cannot be used.

Comparative example 4:

the nickel element additive for aluminum alloy contains nickel 75 wt%, atomized nickel powder 75 wt%, sodium fluorosilicate 3 wt%, calcium carbonate 2 wt%, potassium fluoroaluminate 19.4 wt%, microcrystalline wax powder 0.4 wt% and ethylenediamine bisstearamide 0.2 wt%.

Materials meeting the requirements are proportioned according to the formula of the invention, 1000 kg of the materials are proportioned in each batch, and the materials are put into a mixer for mixing for 30 minutes. Then, the mixed materials are pressed into round cakes by a hydraulic press, the weight of each block is 500 +/-10 g, and the density: 4.6-4.8g/cm³And detecting the components, the density and the moisture of the prepared nickel element additive, wrapping the nickel element additive by using an aluminum foil after the detection is qualified, and packaging the nickel element additive by 2.5 kg/bag and 20 kg/carton.

The nickel element additive prepared according to the comparative example 4 is used for adding nickel element into 8001 wrought aluminum alloy, the adding temperature is 723 ℃, the adding amount is 1.493%, the Ni content in the alloy is 1.12%, the mixture is uniformly stirred after being added for 15 minutes, sampling detection shows that the Ni content detection value is 1.08646%, the actual yield is 97.0%, the alloy standard is met, but the slag aluminum separation effect is poor, and the smoke gas amount is large.

The flux-type nickel additive prepared according to comparative example 4 has a melting time longer than that of the composite nickel additive of example 2 by about 3 minutes under the same conditions.

Comparative example 5:

the nickel element additive for aluminum alloy contains 75% of nickel, 75% of gas atomized nickel powder, 4.5% of calcium fluoride, 3% of sodium fluosilicate, 2% of calcium carbonate, 15.3% of potassium fluoroaluminate and 0.2% of ethylenediamine bisstearamide.

Will meetThe required materials are proportioned according to the formula proportion, each batch is proportioned to 1000 kg, and the materials are put into a mixer for mixing for 30 minutes. Then, the mixed materials are pressed into round cakes by a hydraulic press, the weight of each block is 500 +/-10 g, and the density: 4.6-4.8g/cm³And detecting the components, the density and the moisture of the prepared nickel element additive, wrapping the nickel element additive by using an aluminum foil after the detection is qualified, and packaging the nickel element additive by 2.5 kg/bag and 20 kg/carton.

The nickel element additive prepared according to the comparative example 5 is placed for 3 months under the conventional temperature and humidity conditions (the temperature is 10-35 ℃, and the relative humidity is 20-90%), and the surface has moisture absorption and oxidation phenomena.

Comparative example 6:

a nickel element additive for aluminum alloy comprises 75% of nickel, 75% of gas atomization nickel powder, 24.4% of aluminum powder, 0.4% of microcrystalline wax powder and 0.2% of ethylenediamine bisstearamide in percentage by mass.

Materials meeting the requirements are proportioned according to the formula of the invention, 1000 kg of the materials are proportioned in each batch, and the materials are put into a mixer for mixing for 30 minutes. Then, the mixed materials are pressed into round cakes by a hydraulic press, the weight of each block is 500 +/-10 g, and the density: 4.6-4.8g/cm³And detecting the components, the density and the moisture of the prepared nickel element additive, wrapping the nickel element additive by using an aluminum foil after the detection is qualified, and packaging the nickel element additive by 2.5 kg/bag and 20 kg/carton.

The nickel element additive prepared according to the comparative example 6 is used for adding nickel element into 8001 wrought aluminum alloy, the adding temperature is 723 ℃, the adding amount is 1.493%, the Ni content in the alloy is 1.12%, the mixture is uniformly stirred after being added for 15 minutes, and sampling detection shows that the Ni content detection value is 0.97104%, and the actual yield is 86.7%; after 20 minutes of adding, stirring evenly, sampling and detecting, wherein the detected value of Ni content is 1.07856%, the actual yield is 96.3%, the alloy standard is met, the smoke gas amount is small, but the slag aluminum separation effect is poor.

The melting time of the aluminum-type nickel additive prepared according to comparative example 6 was about 8 minutes longer than that of the composite nickel additive of example 2 under the same conditions.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the inventive concept, and these changes and modifications are all within the scope of the present invention.