CN110592318A - Molybdenum-manganese ball added for steel making and preparation method thereof - Google Patents
Molybdenum-manganese ball added for steel making and preparation method thereof Download PDFInfo
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- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
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Abstract
The invention discloses a molybdenum-manganese ball added for steelmaking, which is prepared from a molybdenum raw material, a manganese raw material and a binder, wherein the weight ratio of the molybdenum raw material to the manganese raw material is 75-90%: 25-10 percent of binder, and the addition amount of the binder is 2-10 percent of the molybdenum raw material and the manganese raw material; the prepared molybdenum-manganese ball contains 40-50 wt% of Mo, 5-20 wt% of Mn, less than or equal to 1.5wt% of Si, less than or equal to 0.10wt% of S, less than or equal to 0.05wt% of P, less than or equal to 0.10wt% of C, less than or equal to 0.5wt% of Cu, less than or equal to 0.05wt% of Sb and less than or equal to 0.06wt% of Sn. The preparation method comprises the following steps of; mixing the raw materials, putting the mixture into a pressure forming machine, pressing the mixture into balls, putting the balls into a hot air circulation tunnel kiln for drying, cooling and packaging to obtain the required molybdenum-manganese balls. The molybdenum-manganese ball has the advantages of high yield of more than 98.7 percent, low energy consumption, no pollution, and capability of obtaining a new product which saves resources and protects the environment.
Description
Technical Field
The invention relates to the technical field of steel making, in particular to a molybdenum-manganese ball added for steel making and a preparation method thereof.
Background
Ferromolybdenum is generally used as an additive for smelting molybdenum-containing alloy steel, but the ferromolybdenum is high in price, and metallurgists develop an alloy additive which adopts cheap primary raw material molybdenum oxide concentrate as molybdenum. The molybdenum oxide concentrate is directly reduced to smelt alloy steel, but molybdenum oxide begins to volatilize at 700 ℃, the loss of the molybdenum oxide powder is large in practical application, the yield of molybdenum is low (only about 94 percent) after the molybdenum oxide powder is used, and meanwhile, the molybdenum oxide powder cannot be fed; the price fluctuation of ferromolybdenum is large by adopting ferromolybdenum. Manganese alloying is achieved by adopting electrolytic manganese, metal manganese and low-carbon ferromanganese, and the electrolytic manganese is flaky, so that the loss is large after the electrolytic manganese is added, and the yield of manganese is about 86%; the metal manganese and the low-carbon ferromanganese are formed by remelting electrolytic manganese after melting, and because the electrolytic manganese and the low-carbon ferromanganese adopt hot melting, the power consumption is 800 kwh/ton, the energy consumption is high, the real object yield of the manganese during hot melting is about 96.5 percent, the manganese loss is 4 percent, the environment is polluted during high-temperature melting, and the danger of increasing harmful elements is also caused.
With the advance of 'two-way integration', all large steel mills optimize the original production flow, the future development direction is to connect all links of automation in series, and the whole flow can be controlled by moving a mouse in front of a computer, and the traditional molybdenum and manganese alloying mode has more adding frequency and is difficult to control.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a molybdenum-manganese ball added for steelmaking and a preparation method thereof, wherein the molybdenum-manganese ball can simplify the production process of molybdenum alloying and manganese alloying, control alloy components for enabling steelmaking alloying elements to reach the standard and control narrow alloy components, can reduce environmental pollution, saves resources and energy, is a steelmaking process with remarkable economic benefit, and conforms to the sustainable development strategy.
The invention aims to solve the problems by the following technical scheme:
the molybdenum-manganese ball added for steel making is characterized in that: the molybdenum-manganese ball is prepared from a molybdenum raw material, a manganese raw material and a binder, wherein the weight ratio of the molybdenum raw material to the manganese raw material is 75-90%: 25-10 percent of binder, the addition amount of which is 2-10 percent of the sum of the weight of the molybdenum raw material and the manganese raw material; the prepared molybdenum-manganese ball contains 40-50 wt% of Mo, 5-20 wt% of Mn, less than or equal to 1.5wt% of Si, less than or equal to 0.10wt% of S, less than or equal to 0.05wt% of P, less than or equal to 0.10wt% of C, less than or equal to 0.5wt% of Cu, less than or equal to 0.05wt% of Sb and less than or equal to 0.06wt% of Sn.
The molybdenum raw material is at least one of molybdenum oxide powder, ferromolybdenum powder and pure molybdenum powder.
The manganese raw material is at least one of low-carbon manganese iron powder, metal manganese powder and electrolytic manganese powder.
The binder is at least one of sodium silicate, silica sol and polyvinyl alcohol.
A preparation method of molybdenum-manganese balls added for steel making is characterized by comprising the following steps: the method comprises the following steps: the weight ratio of the molybdenum raw material to the manganese raw material is 75-90%: after 25 to 10 percent of the raw materials are mixed, adding a binder accounting for 2 to 10 percent of the total weight of the molybdenum raw material and the manganese raw material and uniformly stirring; and putting the stirred raw materials into a pressure forming machine for press forming, putting the press-formed molybdenum-manganese balls into a hot air circulation tunnel kiln with the set temperature of 150-220 ℃ for drying for 45-60 min, cooling the dried molybdenum-manganese balls, and packaging to obtain the molybdenum-manganese balls added for steel making.
The pressure of the pressure forming machine is not less than 100T, and the pressure forming machine is a double-roller type powerful forming machine.
The feeding and pressing process of the pressure forming machine comprises the following steps: the uniformly stirred materials are conveyed to a lifter through a conveying belt and then uniformly put into a pressure forming machine for prepressing, then the materials enter a double-roller main pressing forming mode, pressed balls are screened and screened through a screen, and the materials enter a hot air circulation tunnel kiln according to requirements.
The drying temperature of the hot air circulation tunnel kiln is 160-200 ℃.
The drying temperature of the hot air circulation tunnel kiln is 160-180 ℃.
The water content of the molybdenum-manganese balls added in the steel making is less than 0.5 wt%.
Compared with the prior art, the invention has the following advantages:
compared with the traditional molybdenum alloying and the traditional manganese alloying, the molybdenum-manganese ball added in the steel making process has the advantages that the yield of a real object is over 98.7 percent, the molybdenum and manganese elements are basically lossless, the power and the drying only need 45 kwh/ton of electricity, and nearly 200 kwh/ton can be saved; meanwhile, the labor cost can be saved, the labor intensity can be reduced, and the productivity can be improved; the molybdenum-manganese balls are prepared by adopting the binding agent to process strongly, so that the energy consumption is low, the pollution is avoided, and a new product which saves resources and protects the environment can be obtained.
When the molybdenum-manganese balls added in the steel making process are applied to steel making alloying, the feeding process can be reduced, the automation degree of the steel making is strongly supported, and the invention conforms to the spirit of 'two-way integration' of informatization and industrialization advocated by the state.
Detailed Description
The present invention will be further described with reference to the following examples.
The molybdenum-manganese ball added for steel making is prepared from a molybdenum raw material, a manganese raw material and a binder, wherein the weight ratio of the molybdenum raw material to the manganese raw material is 75-90%: 25-10 percent of binder, the addition amount of which is 2-10 percent of the sum of the weight of the molybdenum raw material and the manganese raw material; the prepared molybdenum-manganese ball contains 40-50 wt% of Mo, 5-20 wt% of Mn, less than or equal to 1.5wt% of Si, less than or equal to 0.10wt% of S, less than or equal to 0.05wt% of P, less than or equal to 0.10wt% of C, less than or equal to 0.5wt% of Cu, less than or equal to 0.05wt% of Sb, less than or equal to 0.06wt% of Sn, other substances and inevitable impurities, and the sum of the weight percentages of all the components in the molybdenum-manganese ball is 100%. Wherein the molybdenum raw material is at least one of molybdenum oxide powder, ferromolybdenum powder and pure molybdenum powder; the manganese raw material is at least one of low-carbon manganese iron powder, metal manganese powder and electrolytic manganese powder; the binder is at least one of sodium silicate, silica sol and polyvinyl alcohol.
A preparation method of molybdenum-manganese balls added for steelmaking comprises the following steps: the weight ratio of the molybdenum raw material to the manganese raw material is 75-90%: after 25 to 10 percent of the raw materials are mixed, adding a binder accounting for 2 to 10 percent of the total weight of the molybdenum raw material and the manganese raw material and uniformly stirring; and putting the stirred raw materials into a pressure forming machine with the pressure not less than 100T for press forming, putting the press-formed molybdenum-manganese balls into a hot air circulation tunnel kiln with the set temperature of 150-220 ℃ for drying for 45-60 min, carrying out air cooling on the dried molybdenum-manganese balls to room temperature, analyzing the components, and packaging after the components are qualified to obtain the needed molybdenum-manganese balls added for steelmaking, wherein the water content of the prepared molybdenum-manganese balls added for steelmaking is less than 0.5 wt%.
In the preparation method, the pressure forming machine is a double-roller type powerful forming machine, and the feeding and pressing process of the pressure forming machine comprises the following steps: the uniformly stirred materials are conveyed to a lifter through a conveying belt and then uniformly put into a pressure forming machine for prepressing, then the materials enter a double-roller main pressing forming mode, pressed balls are screened and screened through a screen, and the materials enter a hot air circulation tunnel kiln according to requirements. One preferable scheme of the drying temperature of the hot air circulation tunnel kiln is as follows: the drying temperature of the hot air circulation tunnel kiln is 160-200 ℃, and the further preferable scheme is as follows: the drying temperature of the hot air circulation tunnel kiln is 160-180 ℃.
Example one
Using 900kg of ferromolybdenum powder (the components comprise 56.5wt% of Mo, 0.85wt% of Si, 0.050wt% of S, 0.02wt% of P, 0.020wt% of C, 0.08wt% of Cu, 0.01wt% of Sb and 0.01wt% of Sn) with the granularity of 0-10mm and 100kg of electrolytic manganese sheets (the components comprise 99.75wt% of Mn, 0.01wt% of C, 0.020wt% of S and 0.002wt% of P), putting 50kg of alkaline sodium silicate solution (baume degree 45) into a stirring machine together, uniformly putting the uniformly stirred material into a pressure forming machine with the pressure of 100T after conveying to a lifting machine, pre-pressing, then entering a pair roller main press forming machine, screening the pressed balls through a screen, entering a hot air circulation tunnel kiln as required, and drying for 45 minutes in the hot air circulation tunnel kiln at the set temperature of 180 ℃; the water content of the pellets taken out from the hot air circulation tunnel kiln is less than 0.5wt%, the strength of the pellets reaches the requirement (the pellets do not crack when falling with the strength of more than 2 meters), the components are analyzed after the pellets are cooled to room temperature by air, and the pellets are packaged after being qualified. And feeding the screened material into a ball press again through a lifter for pressing. The prepared molybdenum-manganese ball contains: 49.6 weight percent of Mo, 9.65 weight percent of Mn, 1.1 weight percent of Si, 0.030 weight percent of S, 0.01 weight percent of P, 0.050 weight percent of C, 0.05 weight percent of Cu, 0.01 weight percent of Sb, 0.01 weight percent of Sn, other substances and inevitable impurities, and the sum of the weight percentages of all the components in the molybdenum-manganese ball is 100 percent, which meets the requirement.
Example two
818kg of molybdenum oxide powder (containing 55wt% of Mo, 0.05wt% of Si, 0.050wt% of S, 0.02wt% of P, 0.020wt% of C, 0.08wt% of Cu, 0.01wt% of Sb and 0.01wt% of Sn) with the granularity of 0-2mm and 182kg of electrolytic manganese sheet (containing 99.75wt% of Mn, 0.01wt% of C, 0.020wt% of S and 0.002wt% of P) are used, 20kg of polyvinyl alcohol aqueous solution is put into a stirrer together for stirring for 10 minutes, the uniformly stirred material is put into a pressure forming machine with the pressure of 100T after being conveyed to a lifter, is pre-pressed and then enters a pair roller main press forming machine, the pressed ball is screened and selected through a screen, enters a hot air circulation tunnel kiln as required, and is baked in a hot air circulation tunnel kiln at the set temperature of 160 ℃ for 50 minutes; the water content of the pellets taken out from the hot air circulation tunnel kiln is less than 0.5wt%, the strength of the pellets reaches the requirement (the pellets do not crack when falling with the strength of more than 2 meters), the components are analyzed after the pellets are cooled to room temperature by air, and the pellets are packaged after being qualified. And feeding the screened material into a ball press again through a lifter for pressing. The prepared molybdenum-manganese ball contains: 44.52wt% of Mo, 17.82wt% of Mn, 0.5wt% of Si, 0.030wt% of S, 0.01wt% of P, 0.080wt% of C, 0.05wt% of Cu, 0.01wt% of Sb, 0.01wt% of Sn, other substances and inevitable impurities, and the sum of the weight percentages of the components in the molybdenum-manganese ball is 100%, which meets the requirement.
EXAMPLE III
780kg of ferromolybdenum powder (containing 60.5wt% of Mo, 0.85wt% of Si, 0.050wt% of S, 0.02wt% of P, 0.020wt% of C, 0.08wt% of Cu, 0.01wt% of Sb and 0.01wt% of Sn) with the granularity of 0-10mm and 220kg of low-carbon manganese iron powder (containing 89wt% of Mn, 0.05wt% of C, 0.020wt% of S and 0.02wt% of P) with the granularity of 0-5mm are used, 30kg of alkaline sodium silicate solution (Baume 45) are put into a stirring machine together for stirring for 8 minutes, the uniformly stirred material is put into a pressure forming machine with the pressure of 100T after being conveyed to a lifting machine through a conveying belt, and then enters a pair roller for main pressing forming, pressed balls are screened and selected by a screen, and enter a hot air circulation tunnel kiln as required, and are dried in a hot air circulation tunnel kiln with the set temperature of 160 ℃ for 45 minutes; the water content of the pellets taken out from the hot air circulation tunnel kiln is less than 0.5wt%, the strength of the pellets reaches the requirement (the pellets do not crack when falling with the strength of more than 2 meters), the components are analyzed after the pellets are cooled to room temperature by air, and the pellets are packaged after being qualified. And feeding the screened material into a ball press again through a lifter for pressing. The prepared molybdenum-manganese ball contains: 46.53wt% of Mo, 19.3wt% of Mn, 0.95wt% of Si, 0.030wt% of S, 0.01wt% of P, 0.080wt% of C, 0.05wt% of Cu, 0.01wt% of Sb, 0.01wt% of Sn, other substances and inevitable impurities, and the sum of the weight percentages of the components in the molybdenum-manganese ball is 100%, which meets the requirement.
Compared with the traditional molybdenum alloying and the traditional manganese alloying, the molybdenum-manganese ball added in the steel making process has the advantages that the yield of a real object is over 98.7 percent, the molybdenum and manganese elements are basically lossless, the power and the drying only need 45 kwh/ton of electricity, and nearly 200 kwh/ton can be saved; meanwhile, the labor cost can be saved, the labor intensity can be reduced, and the productivity can be improved; the molybdenum-manganese balls are prepared by adopting the binding agent to process strongly, so that the energy consumption is low, the pollution is avoided, and a new product which saves resources and protects the environment can be obtained.
The above embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby, and any modification made on the basis of the technical scheme according to the technical idea proposed by the present invention falls within the protection scope of the present invention; the technology not related to the invention can be realized by the prior art.
Claims (10)
1. The molybdenum-manganese ball added for steel making is characterized in that: the molybdenum-manganese ball is prepared from a molybdenum raw material, a manganese raw material and a binder, wherein the weight ratio of the molybdenum raw material to the manganese raw material is 75-90%: 25-10 percent of binder, the addition amount of which is 2-10 percent of the sum of the weight of the molybdenum raw material and the manganese raw material; the prepared molybdenum-manganese ball contains 40-50 wt% of Mo, 5-20 wt% of Mn, less than or equal to 1.5wt% of Si, less than or equal to 0.10wt% of S, less than or equal to 0.05wt% of P, less than or equal to 0.10wt% of C, less than or equal to 0.5wt% of Cu, less than or equal to 0.05wt% of Sb and less than or equal to 0.06wt% of Sn.
2. The steelmaking additive molybdenum manganese ball of claim 1, wherein: the molybdenum raw material is at least one of molybdenum oxide powder, ferromolybdenum powder and pure molybdenum powder.
3. The steelmaking additive molybdenum manganese ball of claim 1, wherein: the manganese raw material is at least one of low-carbon manganese iron powder, metal manganese powder and electrolytic manganese powder.
4. The steelmaking additive molybdenum manganese ball of claim 1, wherein: the binder is at least one of sodium silicate, silica sol and polyvinyl alcohol.
5. A method of manufacturing steelmaking added molybdenum manganese balls as claimed in any one of claims 1 to 4, characterized in that: the method comprises the following steps: the weight ratio of the molybdenum raw material to the manganese raw material is 75-90%: after 25 to 10 percent of the raw materials are mixed, adding a binder accounting for 2 to 10 percent of the total weight of the molybdenum raw material and the manganese raw material and uniformly stirring; and putting the stirred raw materials into a pressure forming machine for press forming, putting the press-formed molybdenum-manganese balls into a hot air circulation tunnel kiln with the set temperature of 150-220 ℃ for drying for 45-60 min, cooling the dried molybdenum-manganese balls, and packaging to obtain the molybdenum-manganese balls added for steel making.
6. The method for preparing molybdenum-manganese balls added for steelmaking as claimed in claim 5, wherein the method comprises the following steps: the pressure of the pressure forming machine is not less than 100T, and the pressure forming machine is a double-roller type powerful forming machine.
7. The method for preparing molybdenum-manganese balls added for steelmaking according to claim 6, wherein the method comprises the following steps: the feeding and pressing process of the pressure forming machine comprises the following steps: the uniformly stirred materials are conveyed to a lifter through a conveying belt and then uniformly put into a pressure forming machine for prepressing, then the materials enter a double-roller main pressing forming mode, pressed balls are screened and screened through a screen, and the materials enter a hot air circulation tunnel kiln according to requirements.
8. The method for preparing molybdenum-manganese balls added for steelmaking as claimed in claim 5, wherein the method comprises the following steps: the drying temperature of the hot air circulation tunnel kiln is 160-200 ℃.
9. The method of manufacturing steelmaking added molybdenum manganese balls as recited in claim 8, wherein: the drying temperature of the hot air circulation tunnel kiln is 160-180 ℃.
10. The method for preparing molybdenum-manganese balls added for steelmaking as claimed in claim 5, wherein the method comprises the following steps: the water content of the molybdenum-manganese balls added in the steel making is less than 0.5 wt%.
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Application publication date: 20191220 |