阅读说明：本技术 一种高效环保的高性能锻轧锰生产方法 (Efficient and environment-friendly production method of high-performance forged manganese ) 是由 王国宁 王兆兵 杨家冬 于 2019-10-05 设计创作，主要内容包括：本发明提供了一种高效环保的高性能锻轧锰生产方法,该方法直接将金属锰原料(电解金属锰片或金属锰块)熔融成液态,经过二氧化碳气雾化,继而冷凝成粉体后再制取锻轧锰产品,过细金属锰粉可回用生产,不存在过细粉体多而不能利用的情况,产品中氧化锰含量低,产品性能优,环境污染小,综合生产成本低,与现有的生产方法有显著的优势。(The invention provides a high-efficiency environment-friendly high-performance forged manganese production method, which directly melts a manganese metal raw material (electrolytic manganese metal sheet or manganese metal block) into a liquid state, atomizes the liquid by carbon dioxide gas, condenses the liquid into powder, and then prepares a forged manganese product.)

1. The production method of the efficient and environment-friendly high-performance forged manganese is characterized by comprising the following steps:

firstly, melting metal manganese: putting metal manganese into an induction smelting furnace, controlling the smelting temperature to 1350-1500 ℃, and refining the molten manganese liquid to remove upper-layer scum;

secondly, atomizing to prepare powder: introducing pure carbon dioxide gas into an atomizer, sucking molten manganese liquid into the atomizer, atomizing into small liquid drops in an atomizing chamber, introducing the carbon dioxide gas into a Venturi powder sprayer, sucking the ultrafine metal manganese powder into the Venturi powder sprayer, then spraying the ultrafine metal manganese powder into the atomizing chamber, colliding and adsorbing with the atomized manganese liquid drops, condensing, recycling the ultrafine metal manganese powder, simultaneously adjusting the temperature of the atomizing chamber by using a cooling coil and a water cooling jacket, controlling the temperature of the upper part in the atomizing chamber to be 400-600 ℃, and controlling the temperature of the lower part in the atomizing chamber to be 200-400 ℃; controlling the pressure of carbon dioxide gas of the atomizer to be 0.8-4 MPa; the particle size of the powder is controlled between 300um and 500 um;

thirdly, cooling: the metal manganese powder subsides atomizing chamber bottom, get into the cooler, cool to the normal atmospheric temperature through the cooler, discharge from the cooler lower part and expect mixing agitator, the powder-containing gas of cooler upper portion export gets into the first order separator and gets into the second grade separator again and gets into the dust remover at last, the powder that comes out from the first order separator bin outlet gets into mixing agitator, the fine powder that crosses that goes out from second grade separator bin outlet and dust remover bin outlet gets into the atomizing chamber through the venturi duster, the reuse carbon dioxide gas arrives the atomizing chamber after dust remover export tail gas is cooled and is supercharged, the mass ratio of the metal manganese that gets into the atomizing chamber and carbon dioxide gas 8 ~ 20: 1;

fourthly, mixing and pressing: mixing metal manganese powder and a binder in a mixing stirrer, pressing the mixture into a forged manganese ball or a forged manganese pillow by a forging press or a roller press, carrying out press forming to obtain a finished product with the density of 4-6 g/cm and the single weight of 250-400 g per finished product, and packaging by a ton bag or an iron barrel after drying and consolidation.

2. The production method of efficient, environment-friendly and high-performance forged and rolled manganese according to claim 1, wherein the drying and consolidation of the forged and rolled manganese ball or the forged and rolled manganese pillow is drying by hot air or natural drying by normal temperature air circulation.

3. The production method of efficient, environment-friendly and high-performance forged manganese according to claim 1, wherein the manganese metal raw material is electrolytic manganese metal or manganese silicon alloy or manganese iron alloy.

4. The production method of efficient, environment-friendly and high-performance forged manganese according to claim 1, wherein the pure carbon dioxide gas contains less than 0.01% of oxygen.

5. The method for producing efficient, environment-friendly and high-performance manganese wrought product according to claim 1, wherein the binder is sodium water glass or potassium water glass or instant powdered sodium silicate.

6. The production method of efficient, environment-friendly and high-performance manganese forging and rolling of claim 1, wherein when the binder is instant powdered sodium silicate, the binder is mixed with metal manganese powder, the mixture is placed into a feeding bin on a forging press or a rolling press, water vapor is introduced into the feeding bin to enable the steam and the instant powdered sodium silicate to be wet and sticky in contact, then the mixture is pressed into manganese forging and rolling balls or manganese forging and rolling pillows, and the mixture is naturally dried by air circulation at normal temperature.

7. The production method of high-efficiency environment-friendly high-performance forged-rolled manganese as claimed in claim 1, wherein when the electrolytic manganese metal is common electrolytic manganese metal, the grade DJMnP is smelted by a vacuum induction furnace, and the manganese is subjected to decarburization, desulfurization, dephosphorization and selenium removal treatment, so that C is less than or equal to 0.01%, S is less than or equal to 0.01%, P is less than or equal to 0.001% and Se is less than or equal to 0.02%.

8. The production method of efficient, environment-friendly and high-performance forged manganese according to claim 1, characterized in that after cooling in step three, the metal manganese powder can be directly obtained as a product without adding a binder for mixing and pressing.

Technical Field

The invention relates to the field of alloy steel production, in particular to a production technology of additive element forged manganese.

Background

Along with the development of the requirements of special high-quality steel and high-manganese alloy steel, the quality requirement of the added element manganese is higher and higher, the requirement is easy to melt, the product is pure and does not bring impurities, the yield of the metal manganese is high, and accurate and quantitative addition is convenient. The adding mode of manganese element is gradually developed into a forged manganese ball from an initial electrolytic manganese metal sheet and a manganese metal block, and the existing production method of forged manganese comprises the following steps: electrolytic manganese metal sheets are made into manganese metal powder by a high-pressure roller mill or a ball mill, about 2 percent of binder (generally sodium silicate) and about 1 percent of curing agent (sodium fluosilicate solution) are added and then uniformly mixed, and the finished product is prepared by drying and sintering after compression molding, and the defects are as follows:

(1) the manganese oxide content in the forged and rolled manganese product is high, and the yield of the metal manganese is low. The existing manganese metal powder manufacturing equipment can generate a large amount of ultrafine powder with the particle size of-150 mu m, which accounts for more than 20% of the total powder mass, because manganese is active in chemical property and easy to oxidize, even if electrolytic manganese metal sheets are stored for a period of time, the ultrafine powder can be oxidized more easily, and then water glass is added in the later process for mixing, so that a large amount of water in the water glass and the manganese metal powder are subjected to contact oxidation reaction, and each link of subsequent forging and pressing and drying can generate manganese oxide, the corresponding oxygen content can reach 2% -3%, and the manganese oxide is changed into scum and is lost when being smelted.

(2) The process of preparing the metal manganese powder can not purify and remove impurities. Some downstream manufacturers strictly control harmful elements, require manganese to be a low-selenium (manganese powder contains 0.02 percent of selenium) or even a selenium-free product, and common electrolytic manganese metal sheets contain up to 0.06 percent of selenium and cannot be used. The low-selenium electrolytic manganese sheet is 1.5 times of the price of the common electrolytic manganese sheet, and the cost for producing the forged and rolled manganese is high.

(3) The environmental pollution is great when preparing the metal manganese powder. High-pressure roller milling or ball milling, especially high-pressure roller milling, is noisy, and due to the addition of a vibration screening device, raised dust is also large, although a dust collecting device is arranged, the system is not easy to seal, the leaked dust amount is still large, the damage to operators in the existing place is large, and the pollution to the surrounding environment is also large.

Disclosure of Invention

Aiming at the defects of the technology, the invention provides an efficient and environment-friendly high-performance forged manganese production method, which directly melts a manganese metal raw material (an electrolytic manganese metal sheet or a manganese metal block) into a liquid state, atomizes the liquid by carbon dioxide gas, condenses the liquid into powder and then prepares a forged manganese product.

The specific technical scheme of the invention is as follows: the production method of the efficient and environment-friendly high-performance forged manganese is characterized by comprising the following steps:

firstly, melting metal manganese: putting metal manganese into an induction smelting furnace, controlling the smelting temperature to 1350-1500 ℃, and refining the molten manganese liquid to remove upper-layer scum;

secondly, atomizing to prepare powder: introducing pure carbon dioxide gas into an atomizer, sucking molten manganese liquid into the atomizer, atomizing into small liquid drops in an atomizing chamber, introducing the carbon dioxide gas into a Venturi powder sprayer, sucking the ultrafine metal manganese powder into the Venturi powder sprayer, then spraying the ultrafine metal manganese powder into the atomizing chamber, colliding and adsorbing with the atomized manganese liquid drops, condensing, recycling the ultrafine metal manganese powder, simultaneously adjusting the temperature of the atomizing chamber by using a cooling coil and a water cooling jacket, controlling the temperature of the upper part in the atomizing chamber to be 400-600 ℃, and controlling the temperature of the lower part in the atomizing chamber to be 200-400 ℃; controlling the pressure of carbon dioxide gas of the atomizer to be 0.8-4 MPa; the particle size of the powder is controlled between 300um and 500 um;

thirdly, cooling: the metal manganese powder subsides atomizing chamber bottom, get into the cooler, cool to the normal atmospheric temperature through the cooler, discharge from the cooler lower part and expect mixing agitator, the powder-containing gas of cooler upper portion export gets into the first order separator and gets into the second grade separator again and gets into the dust remover at last, the powder that comes out from the first order separator bin outlet also gets into mixing agitator, the fine powder that crosses that goes out from second grade separator bin outlet and dust remover bin outlet passes through the venturi duster and gets into the atomizing chamber, dust remover export tail gas retrieval and utilization carbon dioxide gas to the atomizing chamber after cooling and pressurizing, the mass ratio of the metal manganese that gets into the atomizing chamber and carbon dioxide gas 8 ~ 20: 1;

fourthly, mixing and pressing: mixing metal manganese powder and a binder in a mixing stirrer, pressing the mixture into a forged manganese ball or a forged manganese pillow by a forging press or a roller press, carrying out press forming to obtain a finished product with the density of 4-6 g/cm and the single weight of 250-400 g per finished product, and packaging by a ton bag or an iron barrel after drying and consolidation.

Further, the drying and consolidation of the forged and rolled manganese balls or forged and rolled manganese pillows are drying by hot air or natural drying by air circulation at normal temperature.

Further, the manganese metal raw material is electrolytic manganese metal or manganese-silicon alloy or manganese-iron alloy.

Further, the pure carbon dioxide gas contains less than 0.01% of oxygen.

Further, the binder is sodium water glass or potassium water glass or instant powdery sodium silicate.

Further, when the binder is made of instant powdery sodium silicate, the binder is mixed with metal manganese powder, the mixture is placed into a feeding bin on a forging press or a roller press, water vapor is introduced into the feeding bin, the steam and the instant powdery sodium silicate are wetted by contact and have viscosity, then the mixture is pressed into forged manganese balls or forged manganese pillows, and the mixture is naturally dried by ventilation at normal temperature.

Further, when the electrolytic manganese metal is common electrolytic manganese metal, the grade DJMnP is smelted by a vacuum induction furnace, and the manganese is subjected to decarburization, desulfurization, dephosphorization and selenium removal treatment, so that the content of C in the manganese is less than or equal to 0.01 percent, the content of S in the manganese is less than or equal to 0.01 percent, the content of P in the manganese is less than or equal to 0.001 percent, and the content of Se in the manganese is less than or equal to 0..

Further, after the cooling in the third step, the metal manganese powder can be directly obtained as a product without adding a binder for mixing and pressing,

the invention has the beneficial effects that:

1. the product greatly reduces harmful impurity elements. The common electrolytic metal sheet manganese is used as a raw material, the temperature is over 1000 ℃ when the raw material is melted and atomized, the boiling point of elemental selenium in the raw material is only 685 ℃, most selenium is evaporated, the selenium content can be reduced from 0.06% to below 0.01%, the requirement of a low-selenium product below 0.02% is met, and the existing production method does not have a removal function.

2. The product performance is integrally improved, and the content of manganese oxide in the product is reduced. When the manganese metal is melted, the manganese oxide on the manganese metal is removed in a scum form, new manganese oxide is not easily generated in the subsequent production process, the manganese melt is atomized into particles, small crystals similar to glass are formed under the protection of atmosphere, the specific surface is small, the manganese oxide is not easily oxidized, and in addition, water glass is not used as a binder, the possibility of producing the manganese oxide is greatly reduced, the oxygen content of a finished product is controlled to be below 0.5 percent and is far lower than the oxygen content of the existing product by 3 percent. And the manganese in the product has uniform particle size distribution, so that the product has high dispersion speed and melting speed when in use, and the actual yield of the manganese element is over 99 percent.

3. The superfine metal manganese powder is recycled and produced in manganese powder preparation, and the condition that the superfine powder is too much to be utilized is avoided.

4. High production efficiency, greatly reduced environmental pollution and low comprehensive production cost.

Drawings

FIG. 1 is a process flow diagram of the present invention.

Detailed Description

The present invention will be described in detail with reference to FIG. 1, which is an apparatus for preparing ultra-fine activated aluminum powder by nitrogen atomization. Firstly, transforming an original device for preparing superfine active aluminum powder by a nitrogen atomization method, changing a gas melting furnace into a medium-frequency induction melting furnace, and adopting a high-temperature resistant material for an atomizer connected to the upper part of an atomization chamber; in addition, a Venturi powder sprayer is additionally arranged at the upper part of the atomizing chamber, the heat exchange area of a water-cooling heat exchanger in the atomizing chamber is increased, in addition, only a secondary cyclone separator is used, and a mixing stirrer, a forging press and a metering packaging device are additionally arranged. After the device is transformed, the specific operation is as follows:

firstly, melting metal manganese: putting metal manganese into an induction smelting furnace, controlling the smelting temperature to be 1400-1500 ℃, and refining molten manganese liquid to remove upper-layer manganese oxide slag;

secondly, atomizing to prepare powder: introducing pure carbon dioxide gas into an atomizer, sucking molten manganese liquid into the atomizer, atomizing into small liquid drops in an atomizing chamber, introducing the carbon dioxide gas into a Venturi powder sprayer, sucking the ultrafine metal manganese powder into the Venturi powder sprayer, then spraying the ultrafine metal manganese powder into the atomizing chamber, colliding and adsorbing with the atomized manganese liquid drops, condensing, recycling the ultrafine metal manganese powder, simultaneously adjusting the temperature of the atomizing chamber by using a cooling coil and a water cooling jacket, controlling the temperature of the upper part in the atomizing chamber to be 400-600 ℃, and controlling the temperature of the lower part in the atomizing chamber to be 200-400 ℃; controlling the pressure of carbon dioxide gas of the atomizer to be 0.8-4 MPa; the particle size of the powder is controlled between 300um and 500 um;

thirdly, cooling: the metal manganese powder subsides atomizing chamber bottom, get into the cooler, cool to the normal atmospheric temperature through the cooler, discharge from the cooler lower part and expect mixing agitator, the powder-containing gas of cooler upper portion export gets into the first order separator and gets into the second grade separator again and gets into the dust remover at last, the powder that comes out from the first order separator bin outlet also gets into mixing agitator, the fine powder that crosses that goes out from second grade separator bin outlet and dust remover bin outlet passes through the venturi duster and gets into the atomizing chamber, dust remover export tail gas retrieval and utilization carbon dioxide gas to the atomizing chamber after cooling and pressurizing, the mass ratio of the metal manganese that gets into the atomizing chamber and carbon dioxide gas 8 ~ 20: 1;

fourthly, mixing and pressing: mixing metal manganese powder and a binder in a mixing stirrer, pressing the mixture into a forged manganese ball or a forged manganese pillow by a forging press or a roller press, carrying out press forming to obtain a finished product with the density of 4-5 g/cm and the single weight of 250-400 g per finished product, and packaging by a ton bag or an iron barrel after drying and consolidation.

Preferably, the manganese metal raw material is electrolytic manganese metal.

Preferably, the pure carbon dioxide gas contains less than 0.01 percent of oxygen.

Optimally, when the binder is instant powdery sodium silicate, the binder is mixed with the metal manganese powder, the mixture is placed into a feeding bin on a forging press or a roller press, water vapor is introduced into the feeding bin, the steam and the instant powdery sodium silicate are wetted by contact and have viscosity, then the mixture is pressed into forged manganese balls or forged manganese pillows, and then the forged manganese balls or forged manganese pillows are naturally dried by ventilation at normal temperature.

Optimally, after the cooling in the third step, the metal manganese powder can be directly obtained as a product without adding a binder for mixing and pressing,

comparison table of quality data of forged and rolled manganese products produced by the method and the existing products

	Mn	O	Si
				ExistingProduct content (%)	96.3	2.8	0.6
Content of inventive product (%)	98.1	0.4	0.4

The foregoing shows and describes the general principles and features of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.