CN1343626A - Industrial process for preparing high-purity super-fine magnetite powder - Google Patents
Industrial process for preparing high-purity super-fine magnetite powder Download PDFInfo
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- CN1343626A CN1343626A CN 00124852 CN00124852A CN1343626A CN 1343626 A CN1343626 A CN 1343626A CN 00124852 CN00124852 CN 00124852 CN 00124852 A CN00124852 A CN 00124852A CN 1343626 A CN1343626 A CN 1343626A
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Abstract
An industrial process for preparing high-purity superfine magnetite powder includes ball grinding, magnetic separation, floatation, superfine grinding, chemically removing impurities, and baking. Its advantages are average granularity less than 1 micron, TF greater than or equal to 72.3%, and high purity of iron oxide (more than 99.9%).
Description
The invention relates to an industrial production method of high-purity superfine magnetite powder, belongs to the technical field of mineral separation, and particularly belongs to the technical field of solid-solid separation.
Along with the development of industries such as magnetic materials, powder metallurgy, chemical industry, coal washing and the like, the demand of high-purity magnetite powder is increased year by year, and meanwhile, higher requirements on high quality, purity, fineness and the like are provided, but the content of the magnetite powder at home and abroad is low at present, such as iron grade, U.S. 71.50%, Sweden 71.80% and domestic highest at home and abroad, the purity is not high and is generally about 98.5%, the granularity is coarse and about 40 μm, the method cannot adapt to the increasing needs of the industries, the main reasons are that ① existing flotation theory has a miszone, the lower limit of the flotation mineral granularity of a mineral dressing textbook is determined to be 5 μm, such as 1985.10, the metallurgy department compiles 'professional basic theory of dressing P59, believes that' the granularity is too small (less than 0.005mm), the quality is light, is difficult to float on air bubbles, the surface activity is large, a large amount of medicament can be adsorbed and can be indiscriminately adhered to the surfaces of other mineral particles, and the indexes influencing the flotation are determined according to the prior art before the theory, the granularity is determined to be 400 μm, namely, the flotation method adapts to the flotation granularity of the flotation technology before the flotation is adjusted to the flotation② the existing reverse flotation method such as patent application No. 98113900 needs to add collecting agent, regulator, inhibitor, the mixture ratio among several agents is not easy to control in industrial production, not only the product purity is affected, but also the cost is increased because the added agent amount is large, ③ the existing high-purity magnetite powder is purified only by physical method, when the purity reaches 99%, the limit of the physical purification method is almost reached, the improvement is difficult to a great extent, and the chemical impurity removal method with good purification effect is not applied basically in the magnetite ore dressing field, even if the individual method involves chemical impurity removal, the expected effect can not be reached because of the recognition error, such as patent application No. 98113900 mentions that the fluorinated removal of SiO is carried out2The method of (1) which uses only fluoride to reactwith fine iron powder, SiO being considered2With fluoride to form SiF4The purity of the fine iron powder can be improved by volatilizing the gas, and the SiF can be obtained by a plurality of research experiments4After the gas is volatilized, the gas is added into the fine iron powderSiO2Although the content is reduced, the fluoride is not only mixed with SiO2④ the prior art method of mineral separation adopts a rolling ball mill to grind, the average particle size of magnetite powder is about 10 μm at most, and the requirement of the average particle size of iron oxide for magnetic materials is not met, ⑤ the prior art method of mineral separation adopts the iron ore powder with coarse crystal particle size as raw material, and the mineral source with coarse crystal particle size in China is less limited.
The invention aims to overcome the defects in the prior art and provide an industrial production method of high-purity superfine magnetite powder.
The purpose of the invention is realized as follows: the method comprises five procedures of ball milling magnetic separation, flotation, superfine grinding, chemical impurity removal and drying, and the specific process comprises the following steps:
grinding ordinary magnetite powder serving as a raw material by a first-stage ball mill, grading the ore discharged by the ball mill by using a cyclone, concentrating settled sand by using a first-stage magnetic separator through magnetic separation, returning to the regrinding, performing magnetic separation on overflowed ore of the cyclone by using a second-stage magnetic separator, entering a second-stage ball mill, grading the ore discharged by the second-stage ball mill by using a cyclone, concentrating the settled sand by using a second-stage magnetic separator through magnetic separation, returning to the second-stage ball mill for regrinding, screening overflowed ore of the cyclone by using a fine screen, returning oversize to the second-stage magnetic separator, concentrating through magnetic separation, regrinding, demagnetizing screened;
introducing the ore pulp subjected to ball milling and magnetic separation into a flotation machine for reverse flotation, wherein the reverse flotation times are 1-6, collecting agents are added in a grading manner, and the ore pulp subjected to flotation enters an ultrafine grinding process;
carrying out superfine grinding on the ore pulp subjected to flotation by using a sand mill, and grinding the average particle size to 10-0.5 um;
precipitating and concentrating the superfine ground ore pulp to 50-80%, adding fluoride in an amount of 1-20% of the weight of iron ore powder in the ore pulp, reacting at 0-100 ℃ for 0.5-3 hours, rinsing with clear water to remove impurities such as Ca, Ma and the like, precipitating and concentrating, adding NaOH in an amount of 0.1-10% of the amount of iron fine powder in the ore pulp at 0-100 ℃ for 0.5-3 hours to remove Al2O3And filtering impurities by using a filter press, returning and reusing filtrate, washing by using dilute hydrochloric acid with the concentration of 2-10%, filtering by using the filter press, returning and reusing filtrate, washing by using clear water until the pH value is 6-7, sending into an indirect heating rotary drum drying machine using coal as a heat source by using a spiral conveyor, drying until the moisture is required, and packaging to obtain a finished product.
Compared with the prior art, the invention has the following characteristics:
1. the purity of the high-purity and ultra-fine magnetite powder produced by the method of the invention is up to more than 99.90 percent and is in the international leading level.
2. The method corrects the misidentification that the flotation granularity cannot be less than 5 mu m in the mineral dressing textbook, more than 30% of the granularity in the ore pulp is less than 5 mu m, and excellent technical indexes are obtained through flotation.
3. The method of the invention applies the chemical impurity removal method to the magnetite beneficiation field for the first time, so that the purity of the mineral powder is improved to more than 99.90 percent.
4. The method of the invention applies the circulating sand mill to the magnetite superfine grinding for the first time, and the average particle size of the mineral powder can reach below 1 μm.
5. According to the method, magnetite is used as a raw material for the first time, and is subjected to ball milling and magnetic separation, and then is subjected to superfine grinding by using a sand mill, so that the iron oxide black pigment with the purity of 97-98% is obtained.
6. The method has the advantages of multiple control points of all procedures and good consistency of product quality. The method has the advantages of continuous production, large scale, high yield, low cost and large-scale industrial production.
7. The method can produce six grades of products by one production line, can organize the production according to the needs of users, and has strong product adaptability.
The drawings illustrate:
FIG. 1 is a general process flow diagram of the process of the present invention.
FIG. 2 is a flow chart of a ball milling magnetic separation process in the method of the present invention.
FIG. 3 is a flow chart of the flotation process in the method of the present invention.
FIG. 4 is a flow chart of the chemical impurity removal drying process in the method of the present invention.
The invention is described in detail below with reference to the accompanying drawings and examples.
The method takes common magnetite powder as a raw material, and the TFe in the common magnetite powder is more than or equal to 50 percent, preferably more than or equal to 60 percent. The ball mill used in the ball milling and magnetic separation process is a long cylinder type rolling ball mill, the diameter of a steel ball is phi 40mm, the length/diameter is more than or equal to 1.8, the preferable length/diameter is more than or equal to 3.5, the concentration of ore pulp is controlled to be about 70%, ore discharge of the ball mill is classified by a swirler, coarse fraction, namely settled sand, is subjected to magnetic separation and concentration by a magnetic separator, is returned to the ball mill for regrinding, fine particles, namely overflow, are subjected to primary or secondary magnetic separation by the magnetic separator, and then enter a two-stage ball mill, or are sold as a.
The length/diameter of the two-stage ball mill is more than or equal to 1.8, the diameter of a steel ball is less than 30mm, the concentration of ore pulp is controlled to be about 50-60%, ore discharge of the ball mill is classified by a cyclone, coarse particles, namely settled sand, are returned to a magnetic separator for magnetic separation and then are ground, fine particles, namely overflow, are screened by a fine screen, and the granularity is finally closed. The fine screen is a high-frequency fine screen, and the screen mesh is 60-200 meshes, preferably 100-150 meshes. Returning oversize products to the magnetic separator for magnetic separation and concentration, then grinding, demagnetizing the undersize ore pulp by a demagnetizer, and then entering a flotation process, or selling the undersize ore pulp as a third-grade product with TFe more than or equal to 71%, or carrying out superfine grinding by a sand mill until the average particle size is 1 mu m, and selling the undersize ore pulp as an iron oxide black pigment with the purity of 97-98%. The average particle size of the fine iron powder entering the flotation process after ball milling and magnetic separation is controlled to be 10-1 mu m, and the best particle size of about 30 percent is below 5 mu m.
The flotation operation is carried out in a flotation machine, the concentration of ore pulp is 20-35%, the preferred concentration is about 30%, and the reverse flotation times are 1-6 times, and the preferred times are 3-4 times. The collecting agent for reverse flotation is an amine collecting agent, the dosage of each ton of fine iron powder is 100-500 g, preferably 150-250 g, the collecting agent is added in a divided manner, the dosage of the first reverse flotation is 40-70% of the total amount, and the dosages of the rest times are decreased gradually. The flotation foams can be combined together to be sold as a five-grade product for ironmaking or coal washing, the reverse flotation foams can be independently stored for each time, and the flotation foams can be randomly combined for two times or more to be sold and respectively supplied to industries such as ironmaking, coal washing, iron oxide red, wear-resistant materials and the like. The TFe of the iron ore powder after flotation is more than or equal to 72.00 percent, and the iron ore powder can also be directly sold as a secondary product after being dried.
The ore pulp after flotation has the coarse granularity of iron ore powder, needs to enter an ultra-fine grinding process, is subjected to ultra-fine grinding by a sand mill, preferably a circulating sand mill with a stirring tank and a grinding tank separated, has high efficiency, high yield and low cost, particularly effectively controls the temperature of the ore pulp, avoids the oxidation phenomenon of the ore pulp in the grinding process, and is particularly important for selling the ore pulp as iron oxide black pigment. The grinding particle size of the final product is generally ground to be 10-0.5 um, and the final product can be mastered and controlled according to the requirements of users, and when the users do not need ultrafine particle size, the ultra-fine grinding can be omitted, and the process is not needed.
The purity of the product is up to 99.9%The high-purity iron ore powder is difficult to purify only by the physical method, and chemical impurity removal is necessary on the basis of the procedures. The method comprises the following steps: the concentration of the superfine ground ore pulp is increased to 50-80% through precipitation concentration, then fluoride is added into a reaction tank, and the addition amount of the fluoride is determined according to CaO, MgO and SiO in the mineral powder2The content is determined, generally 1-20% of the weight of the iron ore powder in the ore pulp, and preferably 1-10 times of the theoretical reaction amount. The fluoride may be NaF, NH4F. Any one or more of HF, preferably HF. The reaction temperature is 0-100 ℃, and the reaction time is 0.5-E3 hours, the following reaction formula:
SiF4as gas evolution, CaF2、MgF2Precipitating into the mineral powder. After the reaction is finished, rinsing with clean water to remove impurities such as Ca, Ma and the like, precipitating and concentrating, and then adding NaOH, wherein the adding amount of the NaOH is 0.1-10% of the amount of the iron fine powder in the ore pulp, and the aim of removing Al is to2O3And the like. The reaction temperature is 0-100 ℃, the reaction time is 0.5-3 hours, and the reaction formula is as follows:
the reaction product is easily soluble in water and can be removed with washing water. Because the content of silicon and aluminum in the iron ore powder is not high, the leached alkali liquor can be used for a plurality of times, and when the compound dissolved in NaOH reaches saturation, lime is added to regenerate NaOH. In the chemical impurity removal process, the fluoride can be used for removing impurities firstly and then NaOH is used for removing impurities, or the NaOH can be used for removing impurities firstly and then the fluoride is used for removing impurities, and the effects are basically the same.
After the fluoride impurity removal and the NaOH impurity removal are finished, filtering by using a filter press, returning the filtrate for reuse, and then washing by using dilute hydrochloric acid with the concentration of 2-10% to remove the CaF which is not washed thoroughly2、MgF2、CaO、MgO、SiO2And the impurities are mixed, so that the iron ore purity is further improved. The above-mentioned impurity-removing process has the discharge of alkaline and acidic waste liquor, and these waste liquors are neutralized, clarified and discharged in the waste water pool, and do not need to increase waste water treatment cost. And (2) washing with dilute hydrochloric acid, filtering with a filter press, returning the filtrate for reuse, washing with clear water until the pH value is 6-7, chemically removing impurities, filter-pressing, sending the washed filter cake into an indirect heating rotary drum dryer using coal as a heat source by using a screw conveyor, drying until the water is required, and packaging to obtain the finished product of the high-purity and superfine magnetite powder.
The first embodiment is as follows: the method is characterized in that common iron fine powder with TFe of 55% is used as a raw material, a rolling ball mill with the length of 4500mm, the diameter of 1200mm and the length/diameter of 3.75 is used, a steel ball phi of 30mm is used for ball milling, the concentration of ore pulp is 70%, classification is carried out by a cyclone after ball milling, settled sand is reground after magnetic separation and concentration by a magnetic separator, the TFe of overflow is more than or equal to 69.00% after magnetic separation by a two-stage magnetic separator, secondary ball milling is carried out on the steel ball phi of 25mm by the rolling ball mill with the length of 2400mm and the diameter of 1200mm, the overflow of the cyclone is screened by a 150-mesh fine screen, oversize materials are returned to the magnetic separator for magnetic separation and concentration and reground, the screened ore pulp TFe is more than or.
Example two: after demagnetizing the ore pulp purified according to the first embodiment, entering a flotation process, and carrying out flotation for three times, wherein a collecting agent is laurylamine, 100 g/ton of mineral powder is added in the first flotation, 60 g/ton of mineral powder is added in the second flotation, and 40 g/ton of mineral powder is added in the third flotation. The primary flotationfroth TFe 66%, the secondary flotation froth TFe 69%, the tertiary flotation froth TFe 70.50%, and the flotation product TFe 72.10%. The method can meet the requirements of medium-high grade ferrite and powder metallurgy, the primary foam is used for washing coal, and the secondary foam and the tertiary foam are combined together for iron oxide red.
Example three: the slurry of example two was subjected to ultra-fine grinding using a circulating sand mill, and the average particle size was 2 μm, and it was used as a raw material for ferrite manufacturers without fine grinding equipment.
Example four: putting the ore pulp obtained in the third embodiment after the superfine grinding into a reaction tank, adding HF with the weight of 10% of the mineral powder into the reaction tank, reacting at 70 ℃ for 2 hours, rinsing with water, adding NaOH with the weight of 4% of the mineral powder, reacting at 70 ℃ for 2 hours, filtering with a press, returning the filtrate to a NaOH storage tank for continuous use, washing with clear water until the pH value is 6-7, adding dilute hydrochloric acid with the concentration of 5% for soaking and washing at room temperature, filtering with the press, returning the filtrate to the dilute hydrochloric acid storage tank for continuous use, washing with clear water until the pH value is 6.8, sending the filter cake into a rotary drum type dryer with coal as a heat source by using a screw conveyor for drying, wherein the water content is 0.4%, the TFe72.32% and the purity is 99.94%.
Example five: in the first embodiment, the purified ore pulp is ground by a circulating sand mill to an average particle size below 1 μm to obtain a black iron oxide product with purity of 97.8% and water content of 0.4%, and the color is similar to that of a standard sample, and the other indexes exceed the requirements of national first-grade products.
Example six: in the third embodiment, the ultra-fine ground ore pulp is placed into a reaction tank, HF with the weight of 0.2% of that of the ore powder is added into the reaction tank, the temperature is 100 ℃, the reaction time is 0.5 hour, the mixture is filtered by a press, the filtrate returns to a NaOH storage tank for continuous use, the pH value is washed by clear water to be 6-7, HF with the weight of 20% of that of the ore powder is added, the mixture is reacted for 0.5 hour at normal temperature, the mixture is filtered by the press, then diluted hydrochloric acid with the concentration of 2% is added for soaking and washing at room temperature, the mixture is filtered by the press, the filtrate returns to the diluted hydrochloric acid storage tank for continuous use, the pH value is washed by the clear water to be 6-7, the mixture is sent into a rotary drum type dryer with coal.
Example seven: example three the ultra-fine ground pulp is put into a reaction tank, HF with 1% of the weight of the mineral powder is added into the tank, the temperature is 100 ℃, the reaction time is 3 hours, a press is used for filtering, NaOH with 10% of the weight of the mineral powder is added, the reaction is carried out for 3 hours at normal temperature, and other examples are the same as example six, the water content of the obtained product is 0.47%, and TFe 72.26%.
Claims (8)
1. An industrial production method of high-purity superfine magnetite powder comprises five procedures of ball-milling magnetic separation, flotation, superfine grinding, chemical impurity removal and drying, and is characterized in that:
a. grinding ordinary magnetite powder serving as a raw material by a first-stage ball mill, grading the ore discharged by the ball mill by using a cyclone, concentrating settled sand by using afirst-stage magnetic separator through magnetic separation, returning to the regrinding, performing magnetic separation on overflowed ore of the cyclone by using a second-stage magnetic separator, entering a second-stage ball mill, grading the ore discharged by the second-stage ball mill by using a cyclone, concentrating the settled sand by using a second-stage magnetic separator through magnetic separation, returning to the second-stage ball mill for regrinding, screening overflowed ore of the cyclone by using a fine screen, returning oversize to the second-stage magnetic separator, concentrating through magnetic separation, regrinding, demagnetizing screened;
b. introducing the ore pulp subjected to ball milling and magnetic separation into a flotation machine for reverse flotation, wherein the reverse flotation times are 1-6, collecting agents are added in a grading manner, and the ore pulp subjected to flotation enters an ultrafine grinding process;
c. carrying out superfine grinding on the ore pulp subjected to flotation by using a sand mill, and grinding the average particle size to 10-0.5 um;
d. precipitating and concentrating the superfine ground ore pulp to 50-80%, adding fluoride in an amount of 1-20% of the weight of iron ore powder in the ore pulp, reacting at 0-100 ℃ for 0.5-3 hours, rinsing with clear water to remove impurities such as Ca, Ma and the like, precipitating and concentrating, adding NaOH in an amount of 0.1-10% of the amount of iron fine powder in the ore pulp at 0-100 ℃ for 0.5-3 hours to remove Al2O3And filtering impurities by using a filter press, returning and reusing filtrate, washing by using dilute hydrochloric acid with the concentration of 2-10%, filtering by using the filter press, returning and reusing filtrate, washing by using clear water until the pH value is 6-7, sending into an indirect heating rotary drum drying machine using coal as a heat source by using a spiral conveyor, drying until the moisture is required, and packaging to obtain a finished product.
2. The method for industrially producing highly pure ultrafine magnetite powder according to claim 1, wherein the TFe of ordinary magnetite powder is 50% or more, preferably 60% or more.
3. The method for industrially producing high-purity ultrafine magnetite powder according to claim 1, wherein the ball mill used in the ball milling and magnetic separation process is a long-tube type rolling ball mill, the length/diameter of which is not less than 1.8, preferably not less than 3.5, and the diameter of the steel ball is phi 40 mm.
4. The method for industrially producing high-purity ultrafine magnetite powder according to claim 1, wherein the fine sieve is a high-frequency fine sieve having a mesh size of 60 to 200 mesh, preferably 100 to 150 mesh.
5. The method for industrially producing high-purity ultrafine magnetite powder according to claim 1, wherein the average particle size of the fine iron powder subjected to the ball milling and magnetic separation and then subjected to the flotation process is controlled to 5 to 15 μm, preferably 10 μm.
6. The method according to claim 1, wherein the collector for reverse flotation is an amine collector, the amount of the collector per ton of fine iron powder is 100-500 g, the amount of the collector for first reverse flotation is 40-70% of the total amount, and the amount of the collector for the remaining times is decreased in a decreasing manner.
7. The method of claim 1, wherein the fluoride is NaF or NH4F. Any one or more of HF, preferably HF.
8. The method for industrially producing high-purity ultrafine magnetite powder according to claim 1 or 7, wherein the chemical impurity removal step comprises removing impurities with a fluoride and then with NaOH, or comprises removing impurities with NaOH and then with a fluoride.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100434184C (en) * | 2005-03-07 | 2008-11-19 | 深圳市伟雄机械设备有限公司 | Method for pretreating gold ore and extracting gold |
| CN101612618B (en) * | 2008-06-27 | 2012-03-07 | 鞍钢集团矿业公司 | Process for discarding coarse tailings with primary sand return for ultralean magnetite ores |
| CN103861733A (en) * | 2014-03-26 | 2014-06-18 | 东北大学 | Method for preparing super iron concentrates through magnetic separation-reverse flotation technology |
| CN106269212A (en) * | 2016-10-14 | 2017-01-04 | 鞍钢集团矿业有限公司 | A kind of magnetic separation grading system is for the method for extraction of superpure concentrate of magnetite |
| CN106755698A (en) * | 2015-11-25 | 2017-05-31 | 湖南恒光化工有限公司 | A kind of application process of Iron concentrate |
| CN107115975A (en) * | 2017-05-23 | 2017-09-01 | 西北矿冶研究院 | Beneficiation method for recovering micro-fine particle iron oxide from copper dressing tailings |
| CN110498624A (en) * | 2018-05-17 | 2019-11-26 | 南京梅山冶金发展有限公司 | The method that iron tailings wholegrain grade prepares cement irony correction material |
| CN110665640A (en) * | 2019-10-15 | 2020-01-10 | 江苏旌凯中科超导高技术有限公司 | Pre-enrichment and concentration process of ultrafine ferrotitanium ore material |
| CN110947494A (en) * | 2019-11-20 | 2020-04-03 | 郑州中科新兴产业技术研究院 | Method for preparing natural black iron oxide from magnetite |
| CN112403687A (en) * | 2020-11-11 | 2021-02-26 | 西安建筑科技大学 | Preparation method and application of magnetic pyrite powder surface super-hydrophobic film |
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2000
- 2000-09-19 CN CNB001248529A patent/CN1142104C/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100434184C (en) * | 2005-03-07 | 2008-11-19 | 深圳市伟雄机械设备有限公司 | Method for pretreating gold ore and extracting gold |
| CN101612618B (en) * | 2008-06-27 | 2012-03-07 | 鞍钢集团矿业公司 | Process for discarding coarse tailings with primary sand return for ultralean magnetite ores |
| CN103861733A (en) * | 2014-03-26 | 2014-06-18 | 东北大学 | Method for preparing super iron concentrates through magnetic separation-reverse flotation technology |
| CN103861733B (en) * | 2014-03-26 | 2016-04-20 | 东北大学 | A kind of magnetic separation-reverse flotation prepares the method for extraction of superpure concentrate of magnetite |
| CN106755698A (en) * | 2015-11-25 | 2017-05-31 | 湖南恒光化工有限公司 | A kind of application process of Iron concentrate |
| CN106269212A (en) * | 2016-10-14 | 2017-01-04 | 鞍钢集团矿业有限公司 | A kind of magnetic separation grading system is for the method for extraction of superpure concentrate of magnetite |
| CN107115975A (en) * | 2017-05-23 | 2017-09-01 | 西北矿冶研究院 | Beneficiation method for recovering micro-fine particle iron oxide from copper dressing tailings |
| CN107115975B (en) * | 2017-05-23 | 2019-05-14 | 西北矿冶研究院 | Beneficiation method for recovering micro-fine particle iron oxide from copper dressing tailings |
| CN110498624A (en) * | 2018-05-17 | 2019-11-26 | 南京梅山冶金发展有限公司 | The method that iron tailings wholegrain grade prepares cement irony correction material |
| CN110498624B (en) * | 2018-05-17 | 2021-12-17 | 南京宝地梅山产城发展有限公司 | Method for preparing cement iron correction material from iron tailings in full-grain level |
| CN110665640A (en) * | 2019-10-15 | 2020-01-10 | 江苏旌凯中科超导高技术有限公司 | Pre-enrichment and concentration process of ultrafine ferrotitanium ore material |
| CN110947494A (en) * | 2019-11-20 | 2020-04-03 | 郑州中科新兴产业技术研究院 | Method for preparing natural black iron oxide from magnetite |
| CN110947494B (en) * | 2019-11-20 | 2021-05-07 | 郑州中科新兴产业技术研究院 | Method for preparing natural black iron oxide from magnetite |
| CN112403687A (en) * | 2020-11-11 | 2021-02-26 | 西安建筑科技大学 | Preparation method and application of magnetic pyrite powder surface super-hydrophobic film |
| CN112403687B (en) * | 2020-11-11 | 2022-07-08 | 西安建筑科技大学 | Preparation method and application of magnetic pyrite powder surface super-hydrophobic film |
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| CN1142104C (en) | 2004-03-17 |
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