CN103276271A - High-purity high-activity molybdenum ball and preparation method - Google Patents
High-purity high-activity molybdenum ball and preparation method Download PDFInfo
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Abstract
The invention discloses a method for preparing a high-purity high-activity molybdenum ball. The method comprises the following steps of: (a) selecting active molybdenum oxide roasted at 500-600 DEG C as a raw material, grinding the material to be below 5mm, carrying out graded burdening, screening out the active molybdenum oxide of 0-3mm and the active molybdenum oxide of 3-5mm, then mixing the active molybdenum oxide uniformly to obtain a mixture as a raw material; (b) adding water to the uniformly mixed raw material obtained in the step (a) for humidifying, wherein water allocation amount accounts for 2-12% of the raw material; selecting neutral sugar syrup as a binder, wherein the adding amount accounts for 0-5% of the raw material; and balling at room temperature and high pressure, wherein the balling temperature is 10-40 DEG C, and the balling pressure is 120-180t. The molybdenum ball prepared by the method has the characteristic of uneasiness of chalking and is used for direct alloying on molybdenum in the molybdenum-containing steel smelting process. According to the high-purity high-active molybdenum ball, ferro-molybdenum alloy is replaced, the yield of metal molybdenum is improved, the molybdenum alloying cost is greatly reduced, and the defects of high cost, low yield and the like existing in the molybdenum alloying of the prior art are overcome.
Description
Technical field
The invention belongs to technical field of ferrous metallurgy, particularly a kind of high-purity high reactivity molybdenum ball and preparation method.
Background technology
The development of steel alloy has represented the industrialized level of a country, ratio, kind and quality and iron and steel power that the output of China's steel alloy accounts for total output of steel also have big gap, and therefore development possesses high added value, high performance steel alloy is steel industry important development direction; Molybdenum is one of main alloy element of widespread use in the steel, widespread use in high strength, high-tenacity steel alloys such as stainless steel, rapid steel, high trade mark gas pipeline steel, ships slab, Highrise buildings steel, pressure vessel steel; Therefore, molybdenum is the main alloy element of producing steel alloy, has unique, irreplaceable effect, and greatly developing of high strength alloy steel provided wide consumption market with regard to the rare molybdenum alloy product in market originally; It only is example with the stainless steel, stainless production has consumed 25% molybdenum approximately, it is the important applied field of molybdenum, molybdenum all has application in austenitic stainless steel, Martensite Stainless Steel, ferritic stainless steel, duplex stainless steel and non-corrosive metal steel, 2009-2011, continuous 3 years stainless steel output of China and consumption sustainable growth have year by year accounted for world's stainless steel output and more than 1/3 of consumption, are stimulating the market requirement of molybdenum alloy product very strong.
The supply side of molybdenum alloy product, at present still based on ferro-molybdenum, the remarkable deficiency that ferro-molybdenum has is the production cost height, is seriously compressing the profit margin of these meagre steel products; Generally to contain C, S, P etc. harmful or to influence the element of composition of steel more to steel for the molybdenum-iron product in addition, therefore, be starved of a kind of part molybdenum-iron that can directly carry out molybdenum alloyization, molybdenum alloy products substitution market that harmful element content is low in the market, reduce iron and steel production cost, improve molybdenum alloy recovery rate and efficient, high-purity high reactivity molybdenum ball of the present invention is tackled the prior art demand and the molybdenum alloy product innovation invented just.
Summary of the invention
The purpose of this invention is to provide a kind of high-purity high reactivity molybdenum ball and preparation method who is difficult for efflorescence, be used for containing molybdenum steel kind smelting process and carry out the molybdenum DIRECT ALLOYING, substitute ferro-molybdenum, improve the recovery rate of metal molybdenum and reduce molybdenum alloy significantly and change into this, overcome problems such as cost height, the recovery rate of prior art molybdenum alloy existence is low.
The objective of the invention is to realize by following technical proposal:
A kind of high-purity high reactivity molybdenum ball, contain by weight percentage:
50%-63% Mo, S :≤0.15%, P :≤0.060%, Cu :≤0.50%, surplus is O and unavoidable impurities element;
This molybdenum ball finished product granularity 10-50mm, granularity is lower than the following particle of 10mm less than 5%.
Further, the principal mode of described Mo is Mo
2O
3And/or be MoO
2
Prepare the method for described high-purity high reactivity molybdenum ball, comprise following key step:
A) raw material is prepared, comprise select materials, abrasive material, batching and batch mixing: selecting the active oxidation molybdenum of 500-600 ℃ of following roasting is raw material, through abrasive material to 5mm, carry out the classification batching, filter out the active oxidation molybdenum of 0-3mm, and the active oxidation molybdenum of 3-5mm, then with both mixings, as raw material;
B) the normal temperature high voltage spherical container shaping method is made ball, comprise damping, adding additives, mixing and pressure ball: the mixing raw material to the step a) gained adds the water damping, water distribution quantity accounts for the 2-12% of raw material, select neutral syrup to make binding agent, add-on accounts for the 0-5% of raw material, by the normal temperature high voltage balling-up, becoming bulb temperature is 10-40 ℃, becomes ball pressure 120-180t.
Further, described classification batching, namely the molybdenum oxide raw material of the 0-3mm molybdenum oxide raw material that accounts for 80%, 3-5mm accounts for 20%.
Adopted such scheme, by above prescription and the described molybdenum ball of technology anacidity, alkali-free, salt-free feature are arranged, wettability and balling-up are good, ball intensity height, be difficult for efflorescence, binding agent is the most critical factor that guarantees molybdenum ball intensity, reactive behavior and harmful element control; When steelmaking process used high-purity high reactivity molybdenum ball of the present invention to carry out molybdenum alloy, the molybdenum element amount that needs in grade, molybdenum element recovery rate and the molten steel of its add-on according to the molybdenum ball determined that recovery rate is calculated according to 97-98%.
Compared with prior art, major advantage of the present invention is summarized as follows:
1) high-purity molybdenum ball of the present invention is a kind of novel Mo alloying product, substitute molybdenum-iron steel is carried out DIRECT ALLOYING, have advantages such as production cost is low, resource, energy conservation, non-pollutant discharge, for traditional molybdenum-iron, the aspect has remarkable economical and social benefit reducing cost, save energy and reduce the cost, realize pollution-free green manufacturing, develop a circular economy etc.; For molybdenum alloy product-feed industry, the molybdenum product of suitable molybdenum amount is provided, the production cost of producing high-purity molybdenum ball is lower more than 60% than producing high-purity molybdenum-iron, and this does not also comprise produces the consumption of ferro-molybdenum aspect resource, energy consumption and pollutant emission.
2) high-purity molybdenum ball of the present invention is possessing creativeness and advance aspect material choice and processing, binding agent selection and the preparation method, the quality and technical index aspect of high-purity high reactivity molybdenum ball product possesses leading domestic level, outstanding index is high pure, higher-grade, high strength, is difficult for efflorescence, high reactivity and high recovery rate, normal temperature high voltage balling-up, syrup binding agent and differential temperature oven dry, guarantee molybdenum ball activity, molybdenum yield reaches 97% during alloying, than adopting molybdenum-iron and other molybdenum ball products high about 10%.
Further, also comprise step c): the dry drying grate differential temperature drying plant that adopts of control carries out drying treatment, through 30min, and differential temperature drying below 200 ℃, the moisture content of molybdenum ball is less than 1%.This is the important step that further guarantees ball intensity, control efflorescence, through 30min, and differential temperature drying below 200 ℃, the moisture content of molybdenum ball is less than 1%.
Further, also comprise step d): control cooling is adopted the air-cooled and cold mode in air blast storehouse of ladder to control the molybdenum ball and is cooled to room temperature.This is the important step that further guarantees molybdenum ball intensity, activity and control efflorescence.
Embodiment
Embodiment
The invention will be further elaborated below in conjunction with embodiment; Embodiment only is used for explanation the present invention, rather than limits the present invention by any way
The raw material that embodiment adopts is as follows, is mass percent when below relating to percentage ratio:
Case study on implementation 1:
Selecting the active oxidation molybdenum of 500 ℃ of following roastings is raw material, Mo52% wherein, and S0.12%, P0.045%, Cu0.45%, surplus is O and does not contain other element harmful to steel; The principal mode of described Mo is Mo
2O
3And/or be MoO
2Raw material is gone into the ball mill abrasive material to 5mm through fragmentation is laggard, carrying out the classification batching makes the 0-3mm material account for 80%, the 3-5mm material accounts for 20%, mixing then, the damping water distribution quantity is 7%, and binding agent selects neutral syrup to make binding agent 3%, adopts the chaser mill stirring and evenly mixing, by the normal temperature high voltage balling-up, become ball pressure 150t, 25 ℃ of pressure ball temperature adopt drying grate differential temperature drying plant to carry out drying treatment, through 30min, differential temperature drying below 200 ℃, the moisture content of molybdenum ball be less than 1%, enters the room temperature that is cooled to that the air-cooled and cold mode in air blast storehouse of ladder is controlled the molybdenum ball after the drying, packed for standby use, the finished product rate of molybdenum ball surpasses more than 98%; The molybdenum ball finished product that makes is carried out quality examination:
Grade aspect: Mo51.74%, S0.08%, P0.045%, Cu0.45%, surplus is O and does not contain other element harmful to steel;
Granularity, intensity aspect: finished product granularity 10-50mm, granularity is lower than the following particle 1.5% of 10mm, does not have efflorescence through 3m height freely falling body;
Active aspect: the recovery rate of molybdenum element reached 99.5% when smelting process adopted product of the present invention to carry out alloying.
Embodiment 2:
The raw material that embodiment adopts is as follows, is mass percent when below relating to percentage ratio:
Selecting the active oxidation molybdenum of 600 ℃ of following roastings is raw material, Mo53% wherein, and S0.08%, P0.045%, Cu0.45%, surplus is O and does not contain other element harmful to steel; Raw material is gone into the ball mill abrasive material to 5mm through fragmentation is laggard, carrying out the classification batching makes the 0-3mm material account for 80%, the 3-5mm material accounts for 20%, mixing then, the damping water distribution quantity is 8%, and binding agent selects neutral syrup to make binding agent 1%, adopts the chaser mill stirring and evenly mixing, by the normal temperature high voltage balling-up, become ball pressure 120t, 35 ℃ of pressure ball temperature adopt drying grate differential temperature drying plant to carry out drying treatment, through 30min, differential temperature drying below 200 ℃, the moisture content of molybdenum ball be less than 1%, enters the room temperature that is cooled to that the air-cooled and cold mode in air blast storehouse of ladder is controlled the molybdenum ball after the drying, packed for standby use, the finished product rate of molybdenum ball surpasses more than 97%; The molybdenum ball finished product that makes is carried out quality examination:
Grade aspect: Mo52.7%, S0.08%, P0.045%, Cu0.45%, surplus is O and does not contain other element harmful to steel;
Granularity, intensity aspect: finished product granularity 10-50mm, granularity is lower than the following particle 1.8% of 10mm, does not have efflorescence through 3m height freely falling body;
Active aspect: the recovery rate of molybdenum element reached 99.5% when smelting process adopted product of the present invention to carry out alloying.
Embodiment 3:
Selecting the active oxidation molybdenum of 500 ℃ of following roastings is raw material, Mo63% wherein, and S0.12%, P0.045%, Cu0.45%, surplus is O and does not contain other element harmful to steel; Raw material is gone into the ball mill abrasive material to 5mm through fragmentation is laggard, carrying out the classification batching makes the 0-3mm material account for 80%, the 3-5mm material accounts for 20%, mixing then, the damping water distribution quantity is 8%, and binding agent selects neutral syrup to make binding agent 5%, adopts the chaser mill stirring and evenly mixing, by the normal temperature high voltage balling-up, become ball pressure 150t, 35 ℃ of pressure ball temperature adopt drying grate differential temperature drying plant to carry out drying treatment, through 30min, differential temperature drying below 200 ℃, the moisture content of molybdenum ball be less than 1%, enters the room temperature that is cooled to that the air-cooled and cold mode in air blast storehouse of ladder is controlled the molybdenum ball after the drying, packed for standby use, the finished product rate of molybdenum ball surpasses more than 98%; The molybdenum ball finished product that makes is carried out quality examination:
Grade aspect: Mo62.7%, S0.08%, P0.045%, Cu0.45%, surplus is O and does not contain other element harmful to steel;
Granularity, intensity aspect: finished product granularity 10-50mm, granularity is lower than the following particle 1.5% of 10mm, does not have efflorescence through 3m height freely falling body;
Active aspect: the recovery rate of molybdenum element reached 99.5% when smelting process adopted product of the present invention to carry out alloying.
Claims (6)
1. high-purity high reactivity molybdenum ball is characterized in that containing by weight percentage:
50%-63% Mo, S :≤0.15%, P :≤0.060%, Cu :≤0.50%, surplus is O and unavoidable impurities element;
This molybdenum ball finished product granularity 10-50mm, granularity is lower than the following particle of 10mm less than 5%.
2. high-purity high reactivity molybdenum ball according to claim 1, it is characterized in that: the principal mode of described Mo is Mo
2O
3Or MoO
2
3. one kind prepares the method for high-purity high reactivity molybdenum ball as claimed in claim 1 or 2, it is characterized in that, comprises following key step:
A) raw material is prepared, comprise select materials, abrasive material, batching and batch mixing: selecting the active oxidation molybdenum of 500-600 ℃ of following roasting is raw material, through abrasive material to 5mm, carry out the classification batching, filter out the active oxidation molybdenum of 0-3mm, and the active oxidation molybdenum of 3-5mm, then with both mixings, as raw material;
B) the normal temperature high voltage spherical container shaping method is made ball, comprise damping, adding additives, mixing and pressure ball: the mixing raw material to the step a) gained adds the water damping, water distribution quantity accounts for the 2-12% of raw material, select neutral syrup to make binding agent, add-on accounts for the 0-5% of raw material, by the normal temperature high voltage balling-up, becoming bulb temperature is 10-40 ℃, becomes ball pressure 120-180t.
4. the method for high-purity high reactivity molybdenum ball according to claim 3 is characterized in that, described classification batching, and namely the molybdenum oxide raw material of the 0-3mm molybdenum oxide raw material that accounts for 80%, 3-5mm accounts for 20%.
5. according to the method for claim 3 or 4 described high-purity high reactivity molybdenum balls, it is characterized in that, also comprise step c): the dry drying grate differential temperature drying plant that adopts of control carries out drying treatment, through 30min, differential temperature drying below 200 ℃, the moisture content of molybdenum ball is less than 1%.
6. the method for high-purity high reactivity molybdenum ball according to claim 5 is characterized in that, also comprises step d): control cooling is adopted the air-cooled and cold mode in air blast storehouse of ladder to control the molybdenum ball and is cooled to room temperature.
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Cited By (2)
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| CN110592318A (en) * | 2019-10-14 | 2019-12-20 | 江苏江南铁合金有限公司 | Molybdenum-manganese ball added for steel making and preparation method thereof |
| CN115482965A (en) * | 2022-09-16 | 2022-12-16 | 北京高压科学研究中心 | Method for improving conductivity of transparent conductive oxide and blue light filtering efficiency |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110592318A (en) * | 2019-10-14 | 2019-12-20 | 江苏江南铁合金有限公司 | Molybdenum-manganese ball added for steel making and preparation method thereof |
| CN115482965A (en) * | 2022-09-16 | 2022-12-16 | 北京高压科学研究中心 | Method for improving conductivity of transparent conductive oxide and blue light filtering efficiency |
| CN115482965B (en) * | 2022-09-16 | 2024-06-04 | 北京高压科学研究中心 | Method for improving conductivity and blue light filtering efficiency of transparent conductive oxide |
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Effective date of registration: 20160517 Address after: Wujin hi tech Industrial Development Zone, Changzhou City, Jiangsu Province, 213000 District Industrial Workshop No. 21 Vantaa Patentee after: CHANGZHOU SHENGFA BULB FACTORY Address before: 213135, No. 8, Lijiang Road, Xixia villa town, Xinbei District, Jiangsu, Changzhou Patentee before: Changzhou Maoshengte Alloy Products Co., Ltd. |
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