阅读说明：本技术 一种镁硅铁合金球化剂及其制备方法 (Magnesium-silicon-iron alloy nodulizer and preparation method thereof ) 是由 包晓刚 魏爽 史鑫 叶文 高鸿魁 于 2020-05-18 设计创作，主要内容包括：本发明涉及镁硅铁合金球化剂及其制备方法,该镁硅铁合金球化剂的制备方法,包括以下步骤：(1)将单晶硅切削料或多晶硅切削料进行烘干；(2)将40-50重量份的烘干后的单晶硅切削料或多晶硅切削料与45-55重量份的废钢混合,然后采用感应炉进行熔炼,获得合金液；(3)将5-9重量份的金属镁、2-5重量份的金属钙和1-3重量份的镧铈稀土加入至合金液中,于1250-1300℃条件下进行合金化反应,然后进行浇筑成型,获得镁硅铁合金球化剂。本发明提供的镁硅铁合金球化剂及其制备方法可降低成本,且控制铝元素含量在较低水平。(The invention relates to a magnesium-silicon-iron alloy nodulizer and a preparation method thereof, wherein the preparation method of the magnesium-silicon-iron alloy nodulizer comprises the following steps: (1) drying the monocrystalline silicon cutting material or the polycrystalline silicon cutting material; (2) mixing 40-50 parts by weight of dried monocrystalline silicon cutting material or polycrystalline silicon cutting material with 45-55 parts by weight of scrap steel, and smelting by using an induction furnace to obtain alloy liquid; (3) adding 5-9 parts by weight of magnesium metal, 2-5 parts by weight of calcium metal and 1-3 parts by weight of lanthanum-cerium rare earth into the alloy liquid, carrying out alloying reaction at 1250-. The magnesium-silicon-iron alloy nodulizer and the preparation method thereof provided by the invention can reduce the cost and control the content of aluminum element at a lower level.)

1. The preparation method of the magnesium-silicon-iron alloy nodulizer is characterized by comprising the following steps of:

(1) drying the monocrystalline silicon cutting material or the polycrystalline silicon cutting material;

(2) mixing 40-50 parts by weight of dried monocrystalline silicon cutting material or polycrystalline silicon cutting material with 45-55 parts by weight of scrap steel, and smelting by using an induction furnace to obtain alloy liquid;

(3) adding 5-9 parts by weight of magnesium metal, 2-5 parts by weight of calcium metal and 1-3 parts by weight of lanthanum-cerium rare earth into the alloy liquid, carrying out alloying reaction at 1250-.

2. The preparation method of the magnesium-silicon-iron alloy nodularizer according to claim 1, wherein the step (1) is specifically as follows: the method comprises the steps of taking water-containing silicon powder leftovers generated in the slicing process of solar-grade monocrystalline silicon or polycrystalline silicon, carrying out extrusion granulation molding to obtain granules, then drying the granules at 80-150 ℃ until the water content is below 1%, and controlling the proportion of the granules with the particle size of more than 1mm in the granules to the total content to be more than 85%.

3. The preparation method of the magnesium-silicon-iron alloy nodulizer according to claim 1, wherein the alloy liquid obtained in the step (2) is subjected to slagging-off and slag removal treatment.

4. The method for preparing a magnesium-silicon-iron alloy nodularizer according to claim 1, wherein the magnesium metal, the calcium metal and the lanthanum-cerium-rare earth are pressed into the alloy liquid by a semi-sealed gravity magnesium pressing process.

5. The method for preparing a magnesium-silicon-iron alloy nodularizer according to claim 1, wherein the scrap steel is a steel grade with an aluminum content of less than or equal to 0.3%.

6. The preparation method of the magnesium-silicon-iron alloy nodularizer according to claim 1, wherein the monocrystalline silicon cutting material or polycrystalline silicon cutting material is leftover of hydrous silicon powder produced in a solar-grade monocrystalline silicon or polycrystalline silicon slicing process.

7. The magnesium-silicon-iron alloy nodulizer is characterized by comprising the following components in percentage by mass: 38-48% of silicon, 4.5-8.5% of magnesium, 1.5-3.5% of calcium, less than 0.25% of aluminum, 1-2.5% of lanthanum and the balance of iron.

8. The magnesium-silicon-iron alloy nodulizer is characterized by being prepared from the following raw materials in parts by weight: 40-50 parts of monocrystalline silicon cutting material or polycrystalline silicon cutting material, 5-9 parts of magnesium metal, 2-5 parts of calcium metal, 1-3 parts of lanthanum-cerium rare earth and 45-55 parts of scrap steel.

Technical Field

The invention relates to an alloy metal material technology, in particular to a magnesium-silicon-iron alloy nodulizer and a preparation method thereof.

Background

The nodular cast iron is one of the most widely used metal materials in industrial application, greatly improves the original performance of the cast iron, has the strength, the plastic toughness and the ductility similar to those of steel, and can be better applied to casting parts with complex stress and higher requirements on the strength, the toughness and the wear resistance. Spheroidization is realized by adding a nodulizer as an important means for obtaining the nodular cast iron, the nodulizer is added to convert the graphite form in the cast iron from strip, sheet, creeping and the like into spherical form, so that a nodular cast iron structure is obtained, and the mechanical property index of the cast iron is effectively improved.

The magnesium-silicon-iron rare earth alloy nodulizer is commonly used in China, and cast iron with a matrix structure of spheroidal graphite is obtained through nodulizing and inoculation treatment, so that the strength of the cast iron is higher than that of carbon steel. Different series of products and different production processes are increasingly paid more attention to the selection of the nodulizer with the specification.

With the appearance of low aluminum and some castings with special requirements on aluminum content in the nodular cast iron industry, the low-aluminum nodulizer is pregnant according to market demands. At present, the production technology of the low-aluminum nodulizer at home and abroad is mainly to smelt ferrosilicon alloy in an ore-smelting furnace, wherein the low-aluminum raw materials of silica, scrap steel, a carbon reducing agent and the like are selected to be put into the furnace to smelt the low-aluminum ferrosilicon, or the ferrosilicon is smelted in the ore-smelting furnace by blowing air to remove aluminum to obtain the low-aluminum ferrosilicon alloy, and then the low-aluminum ferrosilicon produced by the ore-smelting furnace is taken as a raw material to smelt and produce the low-aluminum nodulizer in an induction furnace. The process for obtaining the low-aluminum nodulizer has the problems of high cost and easy generation of subcutaneous air hole defects.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the preparation method of the magnesium-silicon-iron alloy nodulizer can reduce the cost and obtain the low-aluminum magnesium-silicon-iron alloy nodulizer. And based on the preparation method, the magnesium-silicon-iron alloy nodulizer is provided.

In order to solve the technical problems, the invention adopts the technical scheme that:

the invention provides a preparation method of a magnesium-silicon-iron alloy nodulizer, which comprises the following steps:

(1) drying the monocrystalline silicon cutting material or the polycrystalline silicon cutting material;

(2) mixing 40-50 parts by weight of dried monocrystalline silicon cutting material or polycrystalline silicon cutting material with 45-55 parts by weight of scrap steel, and smelting by using an induction furnace to obtain alloy liquid;

(3) adding 5-9 parts by weight of magnesium metal, 2-5 parts by weight of calcium metal and 1-3 parts by weight of lanthanum-cerium rare earth into the alloy liquid, carrying out alloying reaction at 1250-.

The invention also provides a magnesium-silicon-iron alloy nodulizer which comprises the following components in percentage by mass: 38-48% of silicon, 4.5-8.5% of magnesium, 1.5-3.5% of calcium, less than 0.25% of aluminum, 1-2.5% of lanthanum and the balance of iron.

The invention also provides a magnesium-silicon-iron alloy nodulizer which is prepared from the following raw materials in parts by weight: 40-50 parts of monocrystalline silicon cutting material or polycrystalline silicon cutting material, 5-9 parts of magnesium metal, 2-5 parts of calcium metal, 1-3 parts of lanthanum-cerium rare earth and 45-55 parts of scrap steel.

The invention has the beneficial effects that:

according to the invention, through the design of the preparation process, the single/polycrystalline silicon cutting material, magnesium, calcium, lanthanum cerium rare earth and waste steel are used as raw materials, and the magnesium silicon iron alloy nodulizer is prepared through an induction furnace electric heating melting process, so that the content of aluminum in the alloy is low, the subcutaneous air hole defect can be avoided, and the magnesium silicon iron alloy nodulizer is suitable for castings which are easy to generate the subcutaneous air hole defect and have requirements on the aluminum content of molten iron. Meanwhile, because the single/polycrystalline silicon cutting waste is used as the raw material, the production cost is greatly reduced, the single/polycrystalline silicon industry cutting powder waste is changed into valuable, and the environmental burden can be reduced.

Drawings

FIG. 1 is a photograph of single/polycrystalline silicon cutting material pelletizing material in a method for preparing a magnesium-silicon-iron alloy nodularizer according to an embodiment of the present invention;

FIG. 2 is a photograph of a furnace in which a smelting process is performed in the method for preparing a magnesium-silicon-iron alloy nodularizer according to the embodiment of the present invention;

FIG. 3 is a photograph of a product of a MgSiFe nodularizer obtained in the method for preparing the MgSiFe alloy nodularizer according to the embodiment of the present invention;

FIG. 4 is a cross-sectional photograph obtained by performing a cross-sectional test on a magnesium-silicon-iron alloy nodulizer according to example 4 of the present invention;

FIG. 5 is a cross-sectional photograph of a magnesium-silicon-iron alloy nodulizer according to example 5 of the present invention obtained by a cross-sectional test.

Detailed Description

In order to explain technical contents, achieved objects, and effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.

The most key concept of the invention is as follows: taking the single/polycrystalline silicon cutting material, magnesium, calcium, lanthanum cerium rare earth and waste steel raw materials, and preparing the low-aluminum magnesium-silicon-iron alloy nodulizer by adopting an induction furnace to electrically heat and melt for one time.

The preparation method of the magnesium-silicon-iron alloy nodulizer provided by the invention comprises the following steps:

(1) drying the monocrystalline silicon cutting material or the polycrystalline silicon cutting material;

(2) mixing 40-50 parts by weight of dried monocrystalline silicon cutting material or polycrystalline silicon cutting material with 45-55 parts by weight of scrap steel, and smelting by using an induction furnace to obtain alloy liquid;

(3) adding 5-9 parts by weight of magnesium metal, 2-5 parts by weight of calcium metal and 1-3 parts by weight of lanthanum-cerium rare earth into the alloy liquid, carrying out alloying reaction at 1250-.

From the above description, the beneficial effects of the present invention are:

according to the invention, through the design of the preparation process, the single/polycrystalline silicon cutting material, magnesium, calcium, lanthanum cerium rare earth and scrap steel are adopted as raw materials, and the magnesium-silicon-iron alloy nodulizer is prepared through an induction furnace electric heating melting process, has low aluminum element content in the alloy, and is suitable for being applied to castings which are easy to generate subcutaneous air hole defects and have requirements on the aluminum content of molten iron. Meanwhile, because the single/polycrystalline silicon cutting waste is used as the raw material, the production cost is greatly reduced, the single/polycrystalline silicon industry cutting powder waste is changed into valuable, and the environmental burden can be reduced.

Further, the step (1) is specifically as follows: taking water-containing silicon leftovers generated in the slicing process of solar-grade monocrystalline silicon or polycrystalline silicon, carrying out extrusion granulation molding to obtain granules, then drying the granules at 80-150 ℃ until the water content is below 1%, and controlling the proportion of the granules with the particle size of more than 1mm in the granules to the total content to be more than 85%.

Further, the alloy liquid obtained in the step (2) is subjected to slag skimming and slag removal treatment.

Furthermore, the magnesium metal, the calcium metal and the lanthanum-cerium rare earth are pressed into the alloy liquid by adopting a semi-sealed gravity magnesium pressing process.

Further, the scrap steel is steel with the aluminum content less than or equal to 0.3%.

Furthermore, the monocrystalline silicon cutting material or the polycrystalline silicon cutting material is water-containing silicon leftovers generated in the slicing process of solar-grade monocrystalline silicon or polycrystalline silicon.

The magnesium-silicon-iron alloy nodulizer provided by the invention comprises the following components in percentage by mass: 38-48% of silicon, 4.5-8.5% of magnesium, 1.5-3.5% of calcium, less than 0.25% of aluminum, 1-2.5% of lanthanum and the balance of iron.

The magnesium-silicon-iron alloy nodulizer provided by the invention is prepared from the following raw materials in parts by weight: 40-50 parts of monocrystalline silicon cutting material or polycrystalline silicon cutting material, 5-9 parts of magnesium metal, 2-5 parts of calcium metal, 1-3 parts of lanthanum-cerium rare earth and 45-55 parts of scrap steel.

Among the raw materials adopted by the invention, the monocrystalline silicon cutting material or the polycrystalline silicon cutting material can be selected from the water-containing silicon leftovers generated in the single/polycrystalline silicon slicing process, and the leftovers can be powder materials, preferably the water-containing silicon powder leftovers generated in the solar grade single/polycrystalline silicon slicing process, and preferably the high-purity water-containing silicon powder leftovers; preferably, the purity of the metal magnesium and the metal calcium is more than 99.9 percent. The scrap steel is steel with the aluminum content less than or equal to 0.3 percent. The lanthanum cerium rare earth can be selected from the prior commercially available lanthanum cerium rare earth.

The examples of the invention are as follows: