WO2022100167A1 - 一种微米级球形加重材料的制备方法 - Google Patents

一种微米级球形加重材料的制备方法 Download PDF

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WO2022100167A1
WO2022100167A1 PCT/CN2021/111873 CN2021111873W WO2022100167A1 WO 2022100167 A1 WO2022100167 A1 WO 2022100167A1 CN 2021111873 W CN2021111873 W CN 2021111873W WO 2022100167 A1 WO2022100167 A1 WO 2022100167A1
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micron
micro
powder
density
particles
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PCT/CN2021/111873
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French (fr)
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许传华
柳雷
彭丽芬
孙国权
刘亚辉
汪光辉
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中钢集团马鞍山矿山研究总院股份有限公司
中钢集团马鞍山矿院新材料科技有限公司
中钢集团南京华忻科技有限公司
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Publication of WO2022100167A1 publication Critical patent/WO2022100167A1/zh

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/02—Well-drilling compositions
    • C09K8/03—Specific additives for general use in well-drilling compositions
    • C09K8/032—Inorganic additives

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  • the invention belongs to the technical field of the preparation of weighting materials, in particular to a preparation method of a micron-scale spherical weighting material, which is mainly used in high-density and ultra-high-density drilling fluids and cement slurry in the exploitation process of oil and gas fields.
  • the high density requirement of drilling fluid has been higher than 2.6g/cm 3 , which requires us to provide weighted materials with a density greater than 4.8g/cm 3 to meet the requirement.
  • High-density drilling fluid and cement slurry refer to cement slurry with a density greater than 2.10g/cm 3 , and the density is increased by adding a weighting agent.
  • weighting materials are as follows: 1) High-density minerals such as magnetite, lead oxide, siderite, etc. are screened according to API standards, and weighting materials with a density of ⁇ 4.8g/ cm3 can be obtained, but there is a problem with drilling tools.
  • a drilling system using formate as a weighting material this system can produce a drilling fluid with a density of 2.3g/ cm3 , and the effect is good, but the weighting effect is poor;
  • Recrystallization Stone weight material the density is 4.1 ⁇ 4.6g/cm 3 , the density of the prepared drilling fluid is not more than 2.30g/cm 3 , when the weight is increased to 2.4g/cm 3 , the fluidity and settlement stability of the system have become the main contradictions;
  • 4 manganese tetroxide micropowder system, the density of this material is 4.8g/cm 3 , the particle size distribution D90 ⁇ 5 ⁇ m, the sedimentation stability and the weighting performance are excellent, but none of them are imported from abroad, the price is high, and the density> 4.8g/ cm 3 weighting material.
  • the micro-scale spherical weighting material prepared by the present invention has a density of 4.8g/cm 3 to 5.6g/cm 3 , a particle size distribution D90 of 2 to 40 ⁇ m, and a spherical weighting rate of ⁇ 96%.
  • the ultra-high-density drilling fluid with a density greater than 2.6 g/cm 3 is prepared, which has the advantages of good settlement stability, reduced drilling tool wear, corrosion resistance and low price.
  • the purpose of the present invention is to address the above-mentioned problems in the prior art, and to provide a micron-level spherical weighting material with a density range of 4.8-5.6 g/cm 3 , a particle size distribution D90 of 2-40 ⁇ m, and a particle sphericity of ⁇ 96%
  • the prepared high-density, micron-scale spherical weighting material is used in drilling fluid and cement slurry. Compared with traditional weighting materials, it has good settlement stability, corrosion resistance, and reduced drilling tool wear. It is suitable for replacing high-end imported high-end materials. Weighting agent products are important.
  • the technical scheme adopted by the preparation method of a kind of micron-level spherical weighting material of the present invention is:
  • the high-purity iron ore concentrate powder selected in step (1) is pulverized-air flow classification to obtain micropowder particles with a particle size distribution D90 of 2-20 ⁇ m;
  • the surface has the same electric charge;
  • the purpose of the electrification treatment is to solve the key technical problem of easy agglomeration of micron-sized powder materials, so that the particle size of the micron-sized powder in the subsequent high-temperature spheroidization process is the same as before spheroidization.
  • the particle size D90 is 2-20 ⁇ m, and the phenomenon that the particles increase significantly due to agglomeration does not appear.
  • the pulverization can be jet pulverization or a combination of jet pulverization and Raymond mill, and the air classification preferably adopts cyclone classification.
  • High-temperature spheroidizing treatment The micro-powder particles with the same electrical properties on the surface are transported to the high-temperature spheroidizing furnace through the micro-powder conveying system for spheroidization at 1400-1800 °C.
  • the Fe 3 O 4 in the particles is oxidized to Fe 2 O 3 , the purpose is to solve the problem of magnetization of the micron spherical weighting material; then it is transported to the cooling device by the air flow to complete the surface homogenization of the spherical micropowder particles, and finally it passes through the micropowder collection device. Collection of micron-sized spherical weighting material.
  • the power application treatment adopts the paradigm generator, the paradigm generator adopts a closed space, and an external 24V or 36V safe power supply is used to make the evenly distributed charges in the wall of the paradigm generator fully contact with the micro-powder particles.
  • the surface of the micropowder particles has the same electrical properties.
  • the high temperature spheroidizing furnace is provided with an airflow pressure system, an oxidizing atmosphere gas distribution system and a heating system.
  • the invention adopts the combination of high temperature pressure spheroidization process and oxidizing atmosphere gas distribution process to oxidize Fe 3 O 4 existing in iron ore powder particles into Fe 2 O 3 , and solves the problem of magnetization of micron-scale spherical weighting materials.
  • the micropowder particles are transported into the high-temperature spheroidizing furnace through the air pressure system, and the oxidizing atmosphere is maintained under the action of the oxidizing atmosphere gas distribution system.
  • the micron-sized spherical weighting agent particles are prepared by cooling and forming of the micro-powder particles, which realizes the adjustment of the surface uniformity and sphericity of the spherical material.
  • the density of the spherical weighting material prepared by the above process is 4.8-5.6 g/cm 3 , the particle size distribution D90 is 2-40 ⁇ m, and the sphericity is ⁇ 96%.
  • the high-purity iron ore concentrate powder in the method of the invention is preferably mirror iron ore concentrate powder, and natural gas is used for heating.
  • the experimental phenomenon shows that the spheroidization process is a weak reducing atmosphere, while the mirror iron ore concentrate has few strong magnetic substances, and the magnetism becomes stronger after spheroidization. , so the subsequent increase in oxidation process demagnetization.
  • the preparation method of a micron-scale spherical weighting material of the present invention has the following advantages:
  • High-purity iron ore concentrate powder with a density of ⁇ 4.8g/ cm3 is used as the basic raw material, which is the product of the iron ore dressing plant.
  • the raw materials are easy to obtain, low in price, green and pollution-free, which reduces the production of micron spherical weighting materials. cost.
  • micropowder particles with a particle size distribution D90 of 2 to 40 ⁇ m are obtained. At the same time, it does not increase the viscosity of drilling fluid.
  • the same electrical charge is applied to the surface of the powder by the paradigm generator equipment, which solves the key technical problem of easy agglomeration of micron-sized powder materials, and makes the micron-sized powder spheroidized by a high-temperature spheroidization device.
  • the diameter is basically the same as before spheroidization, the particle diameter D90 is 2-40 ⁇ m, and there is no obvious increase of particles due to agglomeration.
  • the high temperature pressure spheroidization process is combined with the oxidizing atmosphere gas distribution process to oxidize the Fe 3 O 4 existing in the iron ore powder particles to Fe 2 O 3 , which solves the problem of the magnetization of the micron spherical weighting material.
  • the high-temperature spheroidization device realizes the adjustment of the surface uniformity and sphericity of the spherical material through precise control of temperature, oxidizing atmosphere, and airflow delivery pressure.
  • the raw material is selected as high-grade hematite and limonite mixed concentrate powder with a density of 4.9g/cm 3 .
  • micropowder particles with a particle size distribution D90 of 26 ⁇ m are applied with a negative charge by a paradigm generator, so that the particle surface has a uniform negative charge, and is transported to a high temperature spheroidizing furnace through a micropowder conveying system, and the temperature in the furnace is adjusted.
  • the temperature reaches 1800°C
  • the sintering process is completed under the synergy of the pressure system, the oxidizing atmosphere distribution system and the heating system, and then it is transported to the rapid cooling device through the micropowder conveying system for homogenization and molding, and finally the micron-sized particles are collected by the micropowder particle collection equipment.
  • Spherical weight material is
  • the prepared micron spherical weighting agent has a density of 4.9 g/cm 3 , a particle size distribution D90 of 26 ⁇ m, and a spheroidization rate of 96.5%.
  • the raw material is high-grade mirror iron ore concentrate powder with a density of 5.0g/ cm3 .
  • micropowder particles with a particle size distribution D90 of 22 ⁇ m are applied with a negative charge by a paradigm generator, so that the particle surface has a uniform negative charge, and is transported to a high temperature spheroidizing furnace through a micropowder conveying system, and the temperature in the furnace is adjusted.
  • the temperature reaches 1600°C
  • the sintering process is completed under the synergy of the pressure system, the oxidizing atmosphere distribution system and the heating system, and then it is transported to the rapid cooling device through the micropowder conveying system for homogenization molding, and finally the micron particle collection equipment is used to collect the micron size Spherical weight material.
  • the density of the prepared micron spherical weighting agent is 5.0 g/cm 3 , the particle size distribution D90 is 22 ⁇ m, and the spheroidization rate is 97.2%.
  • the raw material is selected as high-grade magnetite concentrate powder with a density of 5.1 g/cm 3 .
  • micropowder particles with a particle size distribution D90 of 16 ⁇ m are applied with a negative charge by a paradigm generator, so that the surface of the particles has a uniform negative charge, and is transported to a high temperature spheroidizing furnace through a micropowder conveying system, and the temperature in the furnace is adjusted.
  • the temperature reaches 1600°C
  • the sintering process is completed under the synergy of the pressure system, the oxidizing atmosphere distribution system and the heating system, and then it is transported to the rapid cooling device through the micropowder conveying system for homogenization molding, and finally the micron particle collection equipment is used to collect the micron size Spherical weight material.
  • the prepared micron spherical weighting agent has a density of 5.1 g/cm 3 , a particle size distribution D90 of 16 ⁇ m, and a spheroidization rate of 96.8%.
  • the raw material is selected as high-grade ilmenite concentrate powder with a density of 5.4g/ cm3 .
  • micropowder particles with a particle size D90 of 5 ⁇ m are applied with a negative charge by a paradigm generator, so that the surface of the particles has a uniform positive charge, and is transported to a high-temperature spheroidizing furnace through a micropowder conveying system, and the temperature in the furnace is adjusted to At 1600°C, the sintering process is completed under the synergy of the pressure system, the oxidizing atmosphere distribution system and the heating system, and then it is transported to the rapid cooling device through the micropowder conveying system for homogenization and molding, and finally the micron-sized spherical particles are collected by the micropowder particle collection equipment. Weighted material.
  • the density of the prepared micron spherical weighting agent is 5.4 g/cm 3 , the particle size D90 is 5 ⁇ m, and the spheroidization rate is 97.8%.
  • the upper and lower limit values and interval values of the raw materials and process parameters involved in the present invention can all realize the products of the present invention, which are not listed one by one here.

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Abstract

一种微米级球形加重材料的制备方法，选择密度≥4.8g/cm 3的高纯铁精矿粉作为原材料，经过粉碎－气流分级后得到粒径分布D90为2～20μm的微粉颗粒；对制得的微粉颗粒进行施电处理，使微粉颗粒表面带有电性相同的电荷；将表面带有相同电性的微粉颗粒经微粉输送系统输送至高温球化炉内在1400～1800℃进行球形化，然后经气流输送至冷却装置完成球形微粉颗粒的表面均质化，最后通过微粉收集装置收集微米级球形加重材料。该方法制备的球形加重材料密度高达4.8～5.6g/cm 3，粒径分布D90为2～40μm，球形率≥96％，可广泛应用于钻井液、水泥浆中。

Description

一种微米级球形加重材料的制备方法 技术领域
本发明属于加重材料制备技术领域，具体涉及一种微米级球形加重材料的制备方法，主要用于油气田开采过程中高密度、超高密度钻井液及水泥浆中。
背景技术
近年来，随着我国油气勘查工作的持续向着深海、深井、超深井等复杂地理环境扩展，使用高密度及超高密度钻井液、水泥浆需求量逐步增加。如，南海油气田储量占我国油气总资源量的1/3，其中70％蕴藏于153.7万平方公里的深海区域。在地理上位于山地和盆地边缘的油气田，如新疆准噶尔盆地和四川盆地油气田开采过程中已钻井多数遇到了异常高压带，施工时所用钻井液密度从2.00g/cm 3到2.60g/cm 3不等；在塔里木盆地油气田开采过程中，钻井液的高密度需求已高于2.6g/cm 3，这需要我们提供密度大于4.8g/cm 3的加重材料才能满足要求。
高密度钻井液、水泥浆是指密度大于2.10g/cm 3的水泥浆，通过添加加重剂来提高密度。常用的加重材料有以下几种：1)磁铁矿、氧化铅、菱铁矿等高密度矿物按照API标准进行筛选，可制得密度≥4.8g/cm 3的加重材料，但存在对钻具磨损严重、沉降稳定性差等问题；2)以甲酸盐作为加重材料的钻井体系，该体系可制得密度2.3g/cm 3的钻井液，效果好，但加重效果较差；3)重晶石类加重材料，密度为4.1～4.6g/cm 3，制备钻井液密度不超过2.30g/cm 3，加重至2.4g/cm 3时，体系的流动性和沉降稳定性已成为主要矛盾；4)四氧化三锰微粉体系，该材料密度为4.8g/cm 3，粒径分布D90≤5μm，沉降稳定性、加重性能优异，然均未国外进口，价格昂贵，且无法提供密度＞4.8g/cm 3的加重材料。
针对上述问题，本发明所制备出的微米级球形加重材料密度为4.8g/cm 3～5.6g/cm 3，粒径分布D90为2～40μm，成球率≥96％的球形加重材料，可制备出密度大于2.6g/cm 3的超高密度钻井液，具有沉降稳定性好、降低钻具磨损、耐腐蚀及价格低廉等优点。目前国内未见相关专利及文献报道。
发明内容
本发明的目的就是针对现有技术中存在的上述问题，而提供一种密度范围为4.8～5.6g/cm 3、粒径分布D90为2～40μm、颗粒球形率≥96％微米级球形加重材料的制备方法，制备的高密度、微米级球形加重材料应用于钻井液、水泥浆中，较于传统加重材料具有沉降稳定性好、耐腐蚀、降低钻具磨损等优良特性，对于取代国外进口高端加重剂产品具有重要意义。
为实现本发明的上述目的，本发明一种微米级球形加重材料的制备方法采用的技术方案为：
(1)原材料的选择：选择密度≥4.8g/cm 3的高纯铁精矿粉作为原材料；所述的高纯铁精矿粉为镜铁矿、赤铁矿、褐铁矿、钛铁矿、磁铁矿中的一种或任意两种及任意两种以上的混合物，但优选镜铁矿、赤铁矿，如果是混合矿，在混合矿中的磁铁矿占有率越少越好，因为含有磁性矿会增加团聚现象，增加了后续处理的难度。
(2)原材料处理：将步骤(1)选择的高纯铁精矿粉经过粉碎－气流分级后得到粒径分布D90为2～20μm的微粉颗粒；对制得的微粉颗粒进行施电处理，使微粉颗粒表面带有电性相同的电荷；施电处理的目的是为了解决微米级粉体材料易团聚的关键技术难题，使得微米级粉体经过后续高温球化处理过程中颗粒的粒径与球形化之前保持基本一致，粒径D90为2～20μm，不出现颗粒因团聚而明显增大的现象。
所述的粉碎可以采用气流粉碎或气流粉碎与雷蒙磨的组合，所述的气流分级最好采用旋风分级。
(3)高温球化处理：将表面带有相同电性的微粉颗粒经微粉输送系统输送至高温球化炉内在1400～1800℃进行球形化，球化过程需在氧化气氛条件下进行，将微粉颗粒中的Fe 3O 4氧化成Fe 2O 3，其目的是为了解决微米级球形加重材料的磁化问题；然后经气流输送至冷却装置完成球形微粉颗粒的表面均质化，最后通过微粉收集装置收集微米级球形加重材料。
所述的施电处理采用范式起电机，范式起电机采用密闭式空间，外接24V或36V安全电源，使范式起电机的壁内均匀分布的电荷与微粉颗粒充分接触，经5～20min处理后使微粉颗粒表面带有相同的电性。
所述的高温球化炉设有气流压力系统、氧化气氛配气系统、加热系统。
本发明采用高温压力球形化工艺与氧化气氛配气工艺相结合，将铁矿粉颗粒中存在的Fe 3O 4氧化成Fe 2O 3，解决了微米级球形加重材料的磁性化问题。
本发明高温球化处理工艺中，微粉颗粒经气流压力系统输送至高温球化炉内，在氧化气氛配气系统的作用下保持氧化气氛，加热系统将温度加热至1400～1800℃时颗粒熔融，最后微粉颗粒冷却成型制备出微米级球形加重剂颗粒，实现了对球形材料表面均匀性、球形率的调节，制备的微米级球形加重材料成球率≥96％。
通过上述工艺制备的球形加重材料密度为4.8～5.6g/cm 3，粒径分布D90为2～40μm，球形率≥96％。
本发明方法中的高纯铁精矿粉优选镜铁矿精矿粉，加热使用天然气，试验现象表明球形化过程为弱还原气氛，而镜铁矿精矿强磁性物质很少，球形化后磁性变强，所以后续增加氧化过程脱磁。
与现有技术相比，本发明一种微米级球形加重材料的制备方法具有如下优点：
(1)以密度≥4.8g/cm 3的高纯铁精矿粉作为原材料为基础原料，为铁矿选矿厂的产品，原料易得，价格低廉，绿色无污染，降低了微米级球形加重材料的生产成本。
(2)高纯铁精矿粉再经过粉碎－气流分级后得到粒径分布D90为2～40μm的微粉颗粒，该粒径分布有利于钻井液固相组成颗粒的紧密堆积排列，完成钻井液加重目的的同时并不增加钻井液的粘度。
(3)采用范式起电机设备对粉体表面施加相同电性电荷，解决了微米级粉体材料易团聚的关键技术难题，使得微米级粉体经过高温球形化装置球形化的过程中颗粒的粒径与球形化之前保持基本一致，粒径D90为2～40μm，未出现颗粒因团聚而明显增大的情况。
(4)采用高温压力球形化工艺与氧化气氛配气工艺相结合，将铁矿粉颗粒中存在的Fe 3O 4氧化为Fe 2O 3，解决了微米级球形加重材料的磁性化问题。
(5)高温球形化装置通过温度、氧化气氛、气流输送压力的精准控制，实现了对球形材料表面均匀性、球形率的调节，制备的微米级球形加重材料成球率≥96％。
具体实施方式
为描述本发明，下面结合实施例对本发明一种微米级球形加重材料的制备方法做进一步详细说明。实施例中步骤、数据为实验室试验结果，原料直接采用通过磨选工艺处理后得到的密度≥4.8g/cm 3的高纯铁精矿粉。
实施例1
原材料选择密度为4.9g/cm 3的高品位赤铁矿、褐铁矿混合精矿粉。
(1)选取密度为4.9g/cm 3的高品位赤铁矿、褐铁矿混合精矿粉， 经过碎磨处理、200目物理筛过筛，再经过雷蒙磨研磨，可制得粒径分布D90为26μm的微粉颗粒。
(2)将制得的粒径分布D90为26μm的微粉颗粒采用范式起电机施加负电荷，使颗粒表面带有均匀的负电荷，经微粉输送系统输送至高温球化炉中，炉内温度调节至1800℃，在压力系统、氧化气氛配气系统、加热系统的协同作用下完成烧结过程，然后经微粉输送系统输送至快速冷却装置中进行均质化成型，最后通过微粉颗粒收集设备收集微米级球形加重材料。
(3)制备的微米级球形加重剂密度为4.9g/cm 3，粒径分布D90为26μm，成球率为96.5％。
实施例2
原材料选择密度为5.0g/cm 3的高品位镜铁矿精矿粉。
(1)选取密度为5.0g/cm 3的高品位镜铁矿精矿粉，经过碎磨处理、200目物理筛过筛，再经过雷蒙磨研磨，可制得粒径分布D90为22μm的微粉颗粒。
(2)将制得的粒径分布D90为22μm的微粉颗粒采用范式起电机施加负电荷，使颗粒表面带有均匀的负电荷，经微粉输送系统输送至高温球化炉中，炉内温度调节至1600℃，在压力系统、氧化气氛配气系统、加热系统的协同作用下完成烧结过程，然后经微粉输送系统输送至快速冷却装置中进行均质化成型，最后通过微粉颗粒收集设备收集微米级球形加重材料。
(4)制备的微米级球形加重剂密度为5.0g/cm 3，粒径分布D90为22μm，成球率为97.2％。
实施例3
原材料选择密度为5.1g/cm 3的高品位磁铁矿精矿粉。
(1)选取密度为5.1g/cm 3的高品位磁铁矿精矿粉作为原材料，经过碎磨处理、200目物理筛过筛，再经过雷蒙磨研磨，可制得粒径 分布D90为16μm的微粉颗粒。
(2)将制得的粒径分布D90为16μm的微粉颗粒采用范式起电机施加负电荷，使颗粒表面带有均匀的负电荷，经微粉输送系统输送至高温球化炉中，炉内温度调节至1600℃，在压力系统、氧化气氛配气系统、加热系统的协同作用下完成烧结过程，然后经微粉输送系统输送至快速冷却装置中进行均质化成型，最后通过微粉颗粒收集设备收集微米级球形加重材料。
(3)制备的微米级球形加重剂密度为5.1g/cm 3，粒径分布D90为16μm，成球率为96.8％。
实施例4
原材料选择密度为5.4g/cm 3的高品位钛铁矿精矿粉。
(1)选取密度为5.4g/cm 3的高品位钛铁矿精矿粉作为原材料，经过碎磨处理、240目物理筛过筛，再经过雷蒙磨研磨，可制得粒径分布D90为5μm的微粉颗粒。
(2)将制得的粒径D90为5μm的微粉颗粒采用范式起电机施加负电荷，使颗粒表面带有均匀的正电荷，经微粉输送系统输送至高温球化炉中，炉内温度调节至1600℃，在压力系统、氧化气氛配气系统、加热系统的协同作用下完成烧结过程，然后经微粉输送系统输送至快速冷却装置中进行均质化成型，最后通过微粉颗粒收集设备收集微米级球形加重材料。
(3)制备的微米级球形加重剂密度为5.4g/cm 3，粒径D90为5μm，成球率为97.8％。
本发明涉及的各原材料、工艺参数的上下限取值、区间值均能实现本发明产品，在此不一一列举。

Claims (5)

  1. 一种微米级球形加重材料的制备方法，其特征在于采用以下步骤：
    (1)原材料的选择：选择密度≥4.8g/cm 3的高纯铁精矿粉作为原材料；
    (2)原材料处理：将密度≥4.8g/cm 3的高纯铁精矿粉经过粉碎－气流分级后得到粒径分布D90为2～20μm的微粉颗粒；对制得的微粉颗粒进行施电处理，使微粉颗粒表面带有电性相同的电荷；
    (3)高温球化处理：将表面带有相同电性的微粉颗粒经微粉输送系统输送至高温球化炉内在1400～1800℃进行球形化，球化过程需在氧化气氛条件下进行，将微粉颗粒中的Fe 3O 4氧化成Fe 2O 3；然后经气流输送至冷却装置完成球形微粉颗粒的表面均质化，最后通过微粉收集装置收集微米级球形加重材料。
  2. 如权利要求1所述的一种微米级球形加重材料的制备方法，其特征在于：所述的密度≥4.8g/cm 3的铁精矿粉为镜铁矿、赤铁矿、褐铁矿、钛铁矿、磁铁矿中的一种或任意两种及任意两种以上的混合物。
  3. 如权利要2求所述的一种微米级球形加重材料的制备方法，其特征在于：所述的施电处理采用范式起电机，范式起电机采用密闭式空间，外接24V或36V安全电源，使范式起电机的壁内均匀分布的电荷与微粉颗粒充分接触，经5～20min处理后使微粉颗粒表面带有相同的电性。
  4. 如权利要求1、2或3所述的一种微米级球形加重材料的制备方法，其特征在于：所述的高温球化炉设有气流压力系统、氧化气氛配气系统、加热系统。
  5. 如权利要求4所述的一种微米级球形加重材料的制备方法，其特征在于：在步骤(2)中，所述的粉碎采用气流粉碎或气流粉碎与雷蒙磨的组合，所述的气流分级采用旋风分级。
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