WO2020082528A1 - 一种低成本高白度煅烧滑石的制备方法 - Google Patents

一种低成本高白度煅烧滑石的制备方法 Download PDF

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WO2020082528A1
WO2020082528A1 PCT/CN2018/120234 CN2018120234W WO2020082528A1 WO 2020082528 A1 WO2020082528 A1 WO 2020082528A1 CN 2018120234 W CN2018120234 W CN 2018120234W WO 2020082528 A1 WO2020082528 A1 WO 2020082528A1
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talc
calcined
magnesite
whiteness
low
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PCT/CN2018/120234
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丛锡桥
仲剑初
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营口腾隆新材料有限公司
丛锡桥
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Publication of WO2020082528A1 publication Critical patent/WO2020082528A1/zh

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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B33/00—Silicon; Compounds thereof
    • C01B33/20—Silicates
    • C01B33/36—Silicates having base-exchange properties but not having molecular sieve properties
    • C01B33/38—Layered base-exchange silicates, e.g. clays, micas or alkali metal silicates of kenyaite or magadiite type
    • C01B33/40—Clays
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/60—Optical properties, e.g. expressed in CIELAB-values
    • C01P2006/65—Chroma (C*)

Definitions

  • a low-cost high-whiteness calcined talc preparation method belongs to the technical field of ceramic raw materials.
  • Talc is a silicate mineral with a layered structure, widely used in paper, ceramics, rubber, paints, paints, cosmetics, refractory equipment, textiles, dyes, casting and pharmaceutical industries.
  • World talc resources are mainly distributed in the United States, Brazil, China, France, Finland and Russia.
  • Chinese talc mines are mainly concentrated in five provinces and regions including Liaoning, Shandong, Guangxi, Jiangxi, and Qinghai, and the total reserves account for 95% of the country's total resources.
  • talc powder can be divided into six categories: chemical-grade talc powder, ceramic-grade talc powder, cosmetic-grade talc powder, pharmaceutical and food-grade talc powder, paper-making talc powder and other talc powder.
  • ceramic-grade talc powder is mainly used to manufacture high-frequency porcelain, radio porcelain, various industrial ceramics, architectural ceramics, daily-use ceramics and glazes. Its characteristics are: high temperature does not change color, whiteness is enhanced after calcination, uniform density, good gloss and smooth surface.
  • the raw materials of talc used in advanced ceramics are mainly high-whiteness calcined talc prepared after calcining black talc.
  • the raw material talc for domestic ceramics is mainly black talc, and the high-whiteness calcined talc obtained by calcining black talc is used as the raw material for ceramics.
  • the patent "A method of preparing black talc into high-whiteness ultrafine talc powder” uses black talc from Guangfeng, Jiangxi as raw material, crushing and pressing black talc into talc bricks, which are then mixed with briquettes
  • High-brightness calcined talc powder can be obtained by calcining in kiln at high temperature for 5-7 days.
  • This kind of calcined talc is not suitable as a high-grade ceramic raw material because of its high calcium content, and can only be used in papermaking and coating industries.
  • the patent "Calcination method of high-whiteness talc ore powder from talc ore raw material” uses talc ore as raw material, and is prepared by crushing, removing impurities, grinding, washing, screening, and magnetic separation. Then, the fine talc ore powder is formed, dried, and sieved to talc noodles, and then calcined and cooled in a rotary kiln to prepare high-whiteness calcined talc powder.
  • the pretreatment of the process is complicated in the early stage, there are many procedures, and the production cost is high.
  • the patent "A calcination process and device for producing high whiteness and low hardness talc using black talc” is to crush and grind the black talc ore, and then fill the calciner with oxygen to remove the black
  • the talc powder is calcined at a high temperature in an oxygen-rich atmosphere to obtain high-whiteness calcined talc.
  • the oxygen-generating equipment is required to provide oxygen for oxygen-rich calcination to remove the carbon-containing organic matter in the black talc.
  • the above methods all use raw talc ore as raw material, and use the calcination method to prepare calcined talc.
  • the process is complicated and the production cost is increased.
  • the calcined exhaust gas needs to be recycled by environmental protection equipment to meet the emission standard .
  • the resources of talc ore that can be used as raw materials for ceramics have been nearly exhausted, resulting in higher prices of high-whiteness calcined talc, which increases the production cost of high-grade ceramics, reduces production efficiency, and restricts the development of the industry.
  • the reaction product phase is the original enstatite (Pen, MgSiO 3 ) Phosphorus quartz (SiO 2 ), which is similar in composition to calcined talc, can replace calcined talc, provides an inexpensive alternative to calcined talc for the advanced ceramic industry, reduces the production cost of advanced ceramics, and improves economic benefits.
  • the technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a low-cost and high-whiteness calcined talc preparation method, using inexpensive and easily available minerals and tailings as raw materials, through grinding, mixing and
  • the calcined talc which is a low-cost ceramic raw material prepared by processes such as calcination, can replace the calcined talc prepared by calcination of raw talc ore as a ceramic raw material.
  • the technical solution adopted by the present invention to solve its technical problem is: the preparation method of the low-cost high-whiteness calcined talc, characterized in that the preparation steps include:
  • the magnesite or magnesite flotation tailings are dry-milled to 60-200 mesh, mixed with silica powder dry-milled to 50-80 mesh and talc / talc slag of 1mm-5 mm to make a brick billet;
  • the present invention provides a method for preparing calcined talc substitutes for ceramics using magnesite or magnesite flotation tailings and silica as main raw materials .
  • the method uses cheap low-grade magnesite or its flotation tailings and silica, and uses a high-temperature solid-phase reaction process to directly prepare a substitute for calcined talc, and the production cost is low.
  • the mass fraction of MgO in the magnesite or magnesite flotation tailings is 35% to 46%, and the mass fraction of SiO 2 is 5% to 23%.
  • the mass fraction of SiO 2 in the silica is 89% -99%.
  • Magnesite is a natural mineral.
  • High-grade magnesite is mainly used as a raw material for refractory materials.
  • Low-grade magnesite (or magnesite flotation tailings) has a high content of impurity silicon and cannot be used as a refractory material. The use of raw materials is a resource that cannot be effectively used.
  • the main components of low-grade magnesite are MgO and SiO 2 , which contains 35-46% MgO and 5-21% SiO 2 .
  • the main component of silica is SiO 2 , and its content is above 89%. After mixing low-grade magnesite and silica, the components in the mixture constitute the MgO-SiO 2 binary system.
  • the composition of the mixture falls within the formation area of the original enstatite (Pen, MgSiO 3 ) and phosphor quartz in the high-temperature phase diagram of the MgO-SiO 2 binary system, and the mixture is decomposed at 1000 ⁇ 1500 °C It reacts with high temperature solid phase to form original enstatite (Pen, MgSiO 3 ) and phosphor quartz.
  • This product can be used as a substitute for calcined talc as a raw material for ceramics.
  • the mass fraction of MgO in the talc is 28% to 31%, and the mass fraction of SiO 2 is 55% to 61%.
  • step 1) materials are prepared by weight: 20-60 parts of magnesite or magnesite flotation tailings, 25-60 parts of silica, and 0-15 parts of talc.
  • the quality of the product prepared by the optimal ratio is better.
  • the raw material mixed powder described in step 3) is calcined at 1000 ° C to 1400 ° C for 2h to 6h.
  • the present invention provides for the preparation and calcination conditions of powder materials, and can obtain a mixture of original enstatite (Pen, MgSiO 3 ) and phosphor quartz more similar to the phase of calcined talc.
  • the brick blank described in step 3) is calcined at 1200 ° C to 1500 ° C for 2h to 7h.
  • the present invention provides a calcination condition for bulk preparation, which can obtain a mixture of original enstatite (Pen, MgSiO 3 ) and phosphor quartz more similar to the phase of calcined talc.
  • the calcination equipment in step 3) is a rotary kiln, a cyclone dynamic calciner or a tunnel kiln.
  • the whiteness of the obtained calcined talc powder / block is 91-96.
  • low-grade magnesite or magnesite flotation tailings and silica and other inexpensive mineral resources containing magnesium and silicon are used as raw materials, and the phase of the product obtained is obtained by calcining the raw talc ore
  • the calcined talc is similar in material, similar in composition and physical properties, and its whiteness reaches 91-96, which is slightly higher than that of natural calcined calcined talc.
  • the whiteness is 90-94, which can replace calcined talc as a raw material for the ceramic industry.
  • the beneficial effects of the present invention are: At present, the raw material resources of talc for high-grade ceramics are exhausted, resulting in a high shortage of high-whiteness calcined talc, high prices, and increased ceramic production costs.
  • the calcination temperature of the two is similar, so there is no increase in energy consumption.
  • magnesite flotation tailings as raw materials can not only solve the environmental impact of magnesite flotation residues, but also reduce the cost of calcined talc substitutes. These characteristics greatly reduce the production cost of the calcined talc substitute produced by the process technology of the present invention, which not only conforms to the national policy of comprehensive utilization of resources and environmental protection and emission reduction, but also reduces the cost for the production of the ceramic industry, and the product has strong market competitiveness .
  • the raw material mixed powder is calcined at 1200 ° C for 6 hours and then cooled to 30 ° C.
  • the calcined talc powder is obtained by crushing, grinding and sieving.
  • the whiteness of the obtained calcined talc powder is 96.
  • the raw material mixed powder is calcined at 1400 ° C for 3.5 hours and then cooled to 25 ° C.
  • the calcined talc powder is obtained by crushing, grinding and sieving.
  • the whiteness of the obtained calcined talc powder is 94.
  • the raw material mixed powder is calcined at 1000 ° C for 8 hours and then cooled to 25 ° C.
  • the calcined talc powder is obtained by crushing, grinding and sieving.
  • the whiteness of the resulting calcined talc powder is 95.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Dispersion Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Silicates, Zeolites, And Molecular Sieves (AREA)
  • Compositions Of Oxide Ceramics (AREA)

Abstract

一种低成本高白度煅烧滑石的制备方法，包括：按重量份备料，菱镁矿或菱镁矿浮选尾矿15～60份、硅石15～60份、滑石/滑石矿渣0～20份；将原料混合后在1000℃～1500℃下煅烧1h～8h后冷却至25℃～40℃获得煅烧滑石粉/块。该方法利用廉价的低品位菱镁矿或其浮选尾矿以及硅石，采用高温固相反应工艺直接制备煅烧滑石的替代品，生产成本低。

Description

一种低成本高白度煅烧滑石的制备方法 技术领域
一种低成本高白度煅烧滑石的制备方法，属于陶瓷原材料技术领域。
 背景技术
滑石是一种具有层状结构的硅酸盐矿物，广泛用于造纸、陶瓷、橡胶、涂料、油漆、化妆品、耐火器材、纺织、染料、铸造及制药等工业领域。世界滑石资源主要分布在美国、巴西、中国、法国、芬兰和俄罗斯等国家。中国滑石矿主要集中在辽宁、山东、广西、江西、青海等五省区，储量之和占全国资源总量的95%。
滑石粉用途可分为六大类：化工级滑石粉、陶瓷级滑石粉、化妆品级滑石粉、医药和食品级滑石粉、造纸级滑石粉以及其他用途滑石粉。其中陶瓷级滑石粉主要用于制造高频瓷、无线电瓷、各种工业陶瓷、建筑陶瓷、日用陶瓷和釉料等。其特点是：高温不变色、煅烧后白度增强、密度均匀、光泽好、表面平滑。目前，高级陶瓷所用的滑石原料主要为黑滑石煅烧后制得的高白度煅烧滑石。在我国，可用于建筑陶瓷和日用陶瓷等高级陶瓷的高质量黑滑石储量已近枯竭，目前仅辽宁和山东等地有少量资源，江西等地的黑滑石由于含钙量高，导致制得的陶瓷制品脆，其用途也受到限制。由于高级陶瓷的滑石原料资源紧缺，高白度、低钙的煅烧滑石价格居高不下，制约了高级陶瓷等行业的发展。因此，寻找高白度煅烧滑石的替代品应该是高级陶瓷原料的发展方向。
目前，国内陶瓷用的原料滑石主要是以黑滑石为主，通过煅烧黑滑石获得高白度的煅烧滑石作为陶瓷的原料。
专利“一种将黑滑石制备成高白度超细滑石粉的方法” (张建平,申请号201410504296.0）是以江西广丰的黑滑石为原料，将黑滑石破碎压制成滑石砖，然后与煤球混合在窑中高温煅烧5-7天获得高白度煅烧滑石粉。这类煅烧滑石由于原料含钙高，不适合用作高级陶瓷原料，仅能用于造纸和涂料等行业。
专利“滑石矿原料制高白度滑石矿粉的煅烧方法”（董爱华等，申请号201810092599.4）以滑石矿为原料，经破碎、除杂、磨矿、水洗、筛选、磁选制备得精滑石矿，再对精滑石矿粉进行成型、干燥处理，过筛处理为滑石粉条，在回转窑中进行煅烧和冷却处理制备得高白度煅烧滑石粉。该工艺前期预处理复杂，工序多，生产成本较高。
专利“黑滑石制作高白超细滑石粉的工艺”（刘少云，申请号200610101218.1）也是以黑滑石矿为原料，经过选矿、破碎、磨粉、煅烧、除铁、打散分级制成白度90-93的煅烧滑石粉或块。该工艺增加了选矿和磁选处理工序，增加生产成本。
专利“一种利用黑滑石生产高白度低硬度滑石的煅烧工艺及装置”（何保罗等，申请号201710498798.0）是将黑滑石矿破碎、磨粉，然后在煅烧炉内充入氧气，将黑滑石粉在富氧氛围下进行高温煅烧，获得高白度煅烧滑石。该工艺为提高煅烧滑石白度，需要制氧设备提供氧气进行富氧煅烧以除去黑滑石中的含碳有机质。
专利“一种煅烧黑滑石增白的工艺及装置”（俞为民等，申请号201310280661.X）以黑滑石为原料，经过选矿、破碎和磨粉、回转窑煅烧和冷却机冷却，制得白度大于90的煅烧滑石。该工艺煅烧过程需设置有机质燃烧废气的回收处理装置，使排放达标。
上述这些方法均是以生滑石矿为原料，采用煅烧的方法制备煅烧滑石。为提高煅烧滑石质量和白度，需增加选矿、磁选除铁和富氧煅烧等工序，流程复杂，增加生产成本；黑滑石中有机质较多时，煅烧废气需要环保设备进行回收处理才能达到排放标准。此外，可用于陶瓷原料的滑石矿资源已近枯竭，导致高白度煅烧滑石的价格较高，使高级陶瓷的生产成本增加，降低了生产效益，制约行业发展。
我国菱镁矿资源丰富，但经过几十年的开采，高品位菱镁矿资源紧缺，为获取高品位菱镁矿，工业生产中采用浮选法对低品位菱镁矿进行提纯，产生大量浮选菱镁矿尾矿，因其利用价值低，被废弃堆放，不仅占用土地资源，也是对不可再生资源的浪费（连娜等，菱镁矿浮选尾矿浆液的烟气脱硫性能，化工环保，2014,34（1））。文献“江西广丰黑滑石煅烧增白及物相变化特征”（许芳芳等，非金属矿，2010，33（6））报道，黑滑石原矿中主要成分为滑石以及少量的白云石和石英，高温煅烧时滑石开始发生相变转化为顽火辉石（MgSiO 3）和石英。因此，利用廉价的低品位菱镁矿或菱镁矿浮选尾矿，配以廉价且资源丰富的硅石矿，采用高温固相反应，反应产物的物相为原顽火辉石（Pen，MgSiO 3）、磷石英（SiO 2），组分与煅烧滑石相似，可替代煅烧滑石，为高级陶瓷行业提供一种价格低廉的煅烧滑石替代品，降低高级陶瓷的生产成本，提高经济效益。
技术问题
本发明要解决的技术问题是：克服现有技术的不足，提供一种低成本高白度煅烧滑石的制备方法，以价廉易得的矿物和尾矿为原料，通过磨粉、混料和煅烧等过程制备低成本的陶瓷原料煅烧滑石，可替代由生滑石矿煅烧制得的煅烧滑石作为陶瓷原料。
 技术解决方案
本发明解决其技术问题所采用的技术方案是：该低成本高白度煅烧滑石的制备方法，其特征在于，制备步骤包括：
1）按重量份备料：菱镁矿或菱镁矿浮选尾矿15~60份、硅石15~60份、滑石/滑石矿渣0~20份；
2）将上述原料混合后，水磨至80~400目，过滤干燥得到原料混合粉料；
或者，将菱镁矿或菱镁矿浮选尾矿干磨至60~200目后与干磨至50~80目的硅石粉和1mm~5 mm的滑石/滑石矿渣混合打成砖坯；
3）将原料混合粉料或砖坯在1000℃~1500℃下煅烧1h~8h后冷却至25℃~40℃，经破碎、磨粉和筛分获得煅烧滑石粉/块。
为解决高级陶瓷使用的煅烧滑石原料的紧缺及成本较高的问题，本发明提供了一种以菱镁矿或菱镁矿浮选尾矿、硅石为主要原料制备陶瓷用煅烧滑石替代品的方法。该方法利用廉价的低品位菱镁矿或其浮选尾矿以及硅石，采用高温固相反应工艺直接制备煅烧滑石的替代品，生产成本较低。
优选的，所述的菱镁矿或菱镁矿浮选尾矿中MgO所占的质量分数为35%~46%、SiO 2所占的质量分数为5%~23%。
优选的，所述的硅石中SiO 2所占的质量分数为89%~99%。
菱镁矿是一种天然矿物，高品位的菱镁矿主要用做耐火材料的原料，低品位菱镁矿（或菱镁矿浮选尾矿）中杂质硅的含量较高，不能作为耐火材料的原料使用，属于一种无法有效利用的资源。低品位菱镁矿中的主要成分是MgO和SiO 2，其中含有35~46%MgO，5~21%的SiO 2。硅石的主要成分是SiO 2，其含量在89%以上。将低品位菱镁矿和硅石混合后，混合物中的组分构成了MgO-SiO 2二元系统。通过调整配比使混合物的组成落在MgO-SiO 2二元体系高温相图中的原顽火辉石（Pen，MgSiO 3）和磷石英的生成区域，在1000~1500℃下使混合物发生分解和高温固相反应生成原顽火辉石（Pen，MgSiO 3）和磷石英，这种产品，可以作为陶瓷的原料煅烧滑石的替代品。
优选的，所述的滑石中MgO所占的质量分数为 28%~31%，SiO 2所占的质量分数为55%~61%。
优选的，步骤1）中按重量份备料：菱镁矿或菱镁矿浮选尾矿20~60份、硅石25~60份、滑石0~15份。优选的配比制备的产品品质更好。
优选的，步骤3）中所述的原料混合粉料在1000℃~1400℃下煅烧2h~6h。本发明提供针对粉料的制备煅烧条件，能够得到与煅烧滑石的物相更相似的原顽火辉石（Pen，MgSiO 3）和磷石英的混合物。
优选的，步骤3）中所述的砖坯在1200℃~1500℃下煅烧2h~7h。本发明提供针对块体制备煅烧条件，能够得到与煅烧滑石的物相更相似的原顽火辉石（Pen，MgSiO 3）和磷石英的混合物。
优选的，步骤3）中所述煅烧的煅烧设备是回转窑、旋流动态煅烧炉或隧道窑。
优选的，所得煅烧滑石粉/块的白度为91~96。采用本发明的工艺技术，利用低品位菱镁矿或菱镁矿浮选尾矿以及硅石等含镁和硅的价廉矿物资源为原料，制得产物的物相与由生滑石矿煅烧获得的煅烧滑石的物相类似，组成和物理性质相近，白度达到91~96，略高于天然滑石煅烧获得的煅烧滑石白度90-94，可以替代煅烧滑石作为陶瓷工业的原料。
 有益效果
与现有技术相比，本发明的所具有的有益效果是：目前，高级陶瓷用的滑石原料资源枯竭，导致高白度煅烧滑石十分紧缺，价格较高，使陶瓷生产成本提高。以低品位菱镁矿或菱镁矿浮选尾矿和硅石等价廉矿物资源为原料，采用煅烧的方法制备陶瓷用高白度煅烧滑石的替代产品，达到降低陶瓷原料成本的目的；与黑滑石煅烧制备高白度煅烧滑石相比，二者煅烧温度相近，因此在能耗上没有增加。利用菱镁矿浮选尾矿为原料，不仅可解决菱镁矿浮选废渣对环境的影响，也可降低煅烧滑石替代品的成本。这些特点使采用本发明工艺技术生产的煅烧滑石替代品的生产成本大幅降低，不仅符合国家资源综合利用和环保减排的国策，也为陶瓷行业生产降低了成本，产品具有较强的市场竞争力。
 本发明的实施方式
下面结合具体实施例对本发明做进一步说明，其中实施例1为最佳实施。
实施例1
1）按重量份备料：菱镁矿45份、硅石40份、滑石5份；菱镁矿中MgO所占的质量分数为39%、SiO 2所占的质量分数为11%；硅石中SiO 2所占的质量分数为93%；滑石矿渣中MgO所占的质量分数为 31%，SiO 2所占的质量分数为57%；
2）将上述原料混合后，加入球磨机进行混合水磨5h，至200目后通过板框压滤机过滤，过滤后的湿物料经旋转闪蒸干燥机干燥得原料混合粉料；
3）将原料混合粉料在1200℃下煅烧6h后冷却至30℃，经破碎、磨粉和筛分获得煅烧滑石粉，所得煅烧滑石粉的白度为96。
实施例2
1）按重量份备料：菱镁矿20份、硅石60份、滑石7份；菱镁矿中MgO所占的质量分数为44%、SiO 2所占的质量分数为5%；硅石中SiO 2所占的质量分数为94%；滑石中MgO所占的质量分数为30%，SiO 2所占的质量分数为56%；
2）将上述原料混合后，加入球磨机进行混合水磨2h，至80目后通过板框压滤机过滤，过滤后的湿物料经旋转闪蒸干燥机干燥得原料混合粉料；
3）将原料混合粉料在1400℃下煅烧3.5h后冷却至25℃，经破碎、磨粉和筛分获得煅烧滑石粉，所得煅烧滑石粉的白度为94。
实施例3
1）按重量份备料：菱镁矿浮选尾矿60份、硅石25份、滑石矿渣15份；菱镁矿浮选尾矿中MgO所占的质量分数为38%、SiO 2所占的质量分数为19%；硅石中SiO 2所占的质量分数为98%；滑石矿渣中MgO所占的质量分数为 28%，SiO 2所占的质量分数为61%；
2）将将菱镁矿或菱镁矿浮选尾矿干磨至60目后与干磨至50目的硅石粉和1mm~5mm的滑石/滑石矿渣混合打成砖坯；
3）将砖坯放置在隧道窑中在1200℃下煅烧5h后冷却至38℃，获得煅烧滑石粉/块，所得煅烧滑石块的白度为92。
实施例4
1）按重量份备料：菱镁矿浮选尾矿15份、硅石60份、滑石矿渣20份；菱镁矿中MgO所占的质量分数为46%、SiO 2所占的质量分数为5%；硅石中SiO 2所占的质量分数为99%；滑石矿渣中MgO所占的质量分数为31%，SiO 2所占的质量分数为55%；
2）将上述原料混合后，加入球磨机进行混合水磨6h，至400目后通过板框压滤机过滤，过滤后的湿物料经旋转闪蒸干燥机干燥得原料混合粉料；
3）将原料混合粉料在1000℃下煅烧8h后冷却至25℃，经破碎、磨粉和筛分获得煅烧滑石粉，所得煅烧滑石粉的白度为95。
实施例5
1）按重量份备料：菱镁矿60份、硅石15份；菱镁矿中MgO所占的质量分数为35%、SiO 2所占的质量分数为23%；硅石中SiO 2所占的质量分数为89%；
2）将菱镁矿或菱镁矿浮选尾矿干磨至200目后与干磨至80目的硅石粉混合打成砖坯；
3）将砖坯放置在隧道窑中在1500℃下煅烧1.5h后冷却至40℃，获得煅烧滑石块，所得煅烧滑石块的白度为94。
以上所述，仅是本发明的较佳实施例而已，并非是对本发明作其它形式的限制，任何熟悉本专业的技术人员可能利用上述揭示的技术内容加以变更或改型为等同变化的等效实施例。但是凡是未脱离本发明技术方案内容，依据本发明的技术实质对以上实施例所作的任何简单修改、等同变化与改型，仍属于本发明技术方案的保护范围。

Claims (9)

  1. 一种低成本高白度煅烧滑石的制备方法，其特征在于，制备步骤包括：
    1）按重量份备料：菱镁矿或菱镁矿浮选尾矿15~60份、硅石15~60份、滑石/滑石矿渣0~20份；
    2）将上述原料混合后，水磨至80~400目，过滤干燥得到原料混合粉料；
    或者，将菱镁矿或菱镁矿浮选尾矿干磨至60~200目后与干磨至50~80目的硅石粉和1mm~5 mm的滑石/滑石矿渣混合打成砖坯；
    3）将原料混合粉料或砖坯在1000℃~1500℃下煅烧1h~8h后冷却至25℃~40℃，经破碎、磨粉和筛分获得煅烧滑石粉/块。
  2. 根据权利要求1所述的一种低成本高白度煅烧滑石的制备方法，其特征在于：所述的菱镁矿或菱镁矿浮选尾矿中MgO所占的质量分数为35%~46%、SiO 2所占的质量分数为5%~23%。
  3. 根据权利要求1所述的一种低成本高白度煅烧滑石的制备方法，其特征在于：所述的硅石中SiO 2所占的质量分数为89%~99%。
  4. 根据权利要求1所述的一种低成本高白度煅烧滑石的制备方法，其特征在于：所述的滑石中MgO所占的质量分数为 28%~31%，SiO 2所占的质量分数为55%~61%。
  5. 根据权利要求1所述的一种低成本高白度煅烧滑石的制备方法，其特征在于：步骤1）中按重量份备料：菱镁矿或菱镁矿浮选尾矿20~60份、硅石25~60份、滑石0~15份。
  6. 根据权利要求1所述的一种低成本高白度煅烧滑石的制备方法，其特征在于：步骤3）中所述的原料混合粉料在1000℃~1400℃下煅烧2h~6h。
  7. 根据权利要求1所述的一种低成本高白度煅烧滑石的制备方法，其特征在于：步骤3）中所述的砖坯在1200℃~1500℃下煅烧2h~7h。
  8. 根据权利要求1所述的一种低成本高白度煅烧滑石的制备方法，其特征在于：步骤3）中所述煅烧的煅烧设备是回转窑、旋流动态煅烧炉或隧道窑。
  9. 根据权利要求1所述的一种低成本高白度煅烧滑石的制备方法，其特征在于：所得煅烧滑石粉/块的白度为91~96。
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