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Laser particle size analyzer application in particle size measurement of activated carbon

Writer:Jinan WinnerSource:Jinan Winner Date:2015-12-02

 

views:19 Date:Dec.3th,2015
 
 Laser particle size analyzer application in particle size measurement of activated carbon
  
1, Activated carbon and its application
Activated carbon, also known as active carbon black. Amorphous carbon black powder or granular. Activated carbon main components in addition to carbon and oxygen, hydrogen and other elements. Activated carbon has developed pore structure, specific surface area, adsorption of carbonaceous material selective adsorption ability. Under certain conditions, the liquid or gas of a certain or certain substances for adsorption removal, purification, purification or recycling, so as to achieve product purification and environmental purification (Jiang Jianchun, 2010). Today, the activated carbon has been widely used in various fields of industry, agriculture, national defense, transportation, food, medicine, environmental protection, and the use of activated carbon can be used after the failure of various methods of repeated regeneration.
Activated carbon is mainly charcoal, sawdust, various shells, coal and petroleum coke and other high carbon material as raw material, through carbonization and activation and preparation of porous adsorbent. Activated carbon adsorption is most of the physical adsorption, that is, Fan Dehua adsorption, there are chemical adsorption.
 
2, Development status and development prospects of activated carbon:
China activated carbon in the history of the application is simply divided into three stages: the first phase is 1940s years ago, China's pharmaceutical industry, the use of activated carbon in the chemical industry, are using imported goods. The second phase since the beginning of 1950s, domestic activated carbon market. Production and application of mutual promotion, activated carbon is rapidly expanding the scope of application. Application of activated carbon in China, not only in the domestic market development, but also into the international market. Third stage 2003- so far; activated carbon used in the decoration of pollution control, dedicated to the adsorption of formaldehyde, benzene, ammonia, radon and other harmful gases and air in the body of the floating bacteria. Currently on the market a large number of domestic activated carbon, activated carbon has been into millions of households, to become environmentally friendly health products.
Traditional activated carbon is mostly used for waste gas treatment. At present, with the high specific area of super activated carbon available, people also try to take it to the human body.
The development and application of activated carbon dust free technology has been a special concern of the industry. However, whether it is with coal as raw material, or in the shell or wood as raw material to produce the amorphous granular activated carbon, cylindrical activated carbon or activated carbon spheres are unable to completely remove the surface adhesion of dust, especially to remove dust on the surface of activated carbon in the prerequisite of attachment of the adsorption characteristics of activated the original carbon. For a long time, the market has been calling for the active carbon dust free technology has not been successfully developed. Therefore, the development of this area also has a certain prospect.
These years, the world's major production of activated carbon in the United States and Japan have focused to the regeneration technology of activated carbon development, activated carbon used once and discarded or recycled has become an important symbol of a country's level of activated carbon industry.
 
3, Activated carbon adsorption and mesh force
In China has become the world's largest producer and exporter of activated carbon, activated carbon detection method for product evaluation, unified testing standards, quality and international trade dispute disposal, is undoubtedly very important. Most of the current domestic evaluation of activated carbon iodine value and methylene blue value, but in engineering practice, not only need to consider the powder activated carbon adsorption surface area, but also to determine whether the pore size distribution of particles inside the activated carbon powder easy to achieve rapid adsorption, in the process of using powdered activated carbon reached the adsorption equilibrium, in addition need to consider the size of carbon powder, powdered activated carbon adsorption of the small number of small specific surface area, adsorption effect is poor, a large number of large specific surface area, adsorption effect will be better, but too much is possible through mesh filter.
Activated carbon mesh refers to the mesh density, particle size of activated carbon is used to represent the mesh. For example, granular activated carbon, granular activated carbon, granular activated carbon is used to mesh representation.
Mesh more that smaller particles, generally more than 100 mesh activated carbon particles tend to powder, but still smaller particles; mesh, while the larger particles such as activated carbon, activated carbon particles of 8 mesh -12 mesh is very big.
The number refers to the size or thickness of materials. The general is defined in the screen of 1 inches *1 inches within the area of the material through the screen, the screen hole number is defined as the number of. As of 200, that of the material through 1 inches *1 inches with 200 mesh screen. And so on, the larger the number of the mesh, material that the finer grain size; mesh size is smaller, the larger the size of that material. The granularity is particles can be obtained by screen mesh size, with 1 inches (25.4mm) the number of mesh width of the screen mesh representation, so called mesh.
In general, activated carbon per unit volume mesh more air contact area is the largest, adsorption is better. This is a limit, such as bamboo charcoal. Big hole, small number, small contact area. Coconut shell activated carbon, mesh, large contact area, good effect. Coal is refined into the activated carbon can only be used for industrial use. Take 5-10 and 10-24 to the same carbon water purification, the same weight, 10-24 activated carbon contact area, good purifying effect, but his slow velocity, net less water, if installed in the water purification equipment, small particles with small equipment, large particles with large equipment.
Activated carbon mesh can be directly converted by the conversion table size, which can understand the activated carbon particle size. In the national standard of activated carbon, it is clear that the size distribution and the effective particle size range, so it can be seen that the particle size of the activated carbon is one of the testing standards.
 
4, activated carbon particle size detection
Measurement of particle size many, in recent years, laser particle size most commonly used laboratory detection because of its high testing speed, good repeatability, wide measuring range and other notable features become popular in the world of particle testing instrument. Activated carbon under the microscope to observe a long strip, and a larger particle size, the sample is not easy to reunite. With the extension of ultrasonic time, the particle size becomes smaller, the sample is easy to be broken, it is not easy to ultrasonic for long time, and the data can be saved in one minute. After several tests, the test results are stable. Test reports are as follows: 
 

 

激光粒度仪在活性炭粒度检测中的应用

浏览次数:19 日期:2015年11月23日 08:49
 

 

一、    活性炭及应用

活性炭又称活性炭黑。是黑色粉末状或颗粒状的无定形碳。活性炭主成分除了碳以外还有氧、氢等元素。活性炭是具有孔隙结构发达、比表面积大、选择性吸附能力强的碳质吸附材料。在一定的条件下,对液体或气体的某一或某些物质进行吸附脱除、净化、精制或回收,从而实现产品的精制和环境的净化(蒋剑春,2010)。时至今日,活性炭已经被广泛应用于工业、农业、国防、交通、食品、医药、环境保护等各个领域,并且活性炭使用失效后可以用各种办法进行多次反复再生。

活性炭主要是以木炭、木屑、各种果壳、煤炭和石油焦等高含碳物质为原料,经碳化和活化而制得的多孔性吸附剂。活性炭的吸附大多数是物理吸附,即范德华吸附,也有化学吸附。

 

二、活性炭发展现状及发展前景:

中国活性炭在应用历史上简单分为三个阶段:第一阶段是20世纪40年代以前,中国制药工业、化学工业中使用活性炭量大,都用进口货。第二阶段自20世纪50年代初开始,国产活性炭上市.生产与应用相互促进,活性炭的应用范围被迅速开拓。中国活性炭的应用,不仅在国内市场发展,而且进入了国际市场。第三阶段2003-至今;活性炭应用于装修污染治理,专用于吸附甲醛、苯系物、氨、氡等所有对人体有害的气体及空气中的浮游细菌。目前市场上家用活性炭众多,活性炭已走进千家万户,成为健康时尚的环保产品。

传统活性炭大都用于废气废水处理。目前,随着高比面积超级活性炭的面世,人们也试图把它利用到人体上。

活性炭无粉尘技术的开发及应用问题一直是业内人士特别关注的。但是,无论是以煤为原料,还是以果壳或是木材为原料所生产的不定型颗粒活性炭、圆柱形活性炭还是球形活性炭都无法彻底地清除掉其表面上附着的粉尘,特别是无法在基本保持活性炭原有的吸附特性的前提下清除活性炭表面上附着的粉尘。长期以来,市场一直在呼唤的活性炭无粉尘化技术至今未能研制成功。因此,这方面的发展也有一定的前景。

这些年来,世界上主要活性炭生产国美国、日本等都已经把着眼点转向活性炭再生技术开发方面,活性炭使用一次后丢弃还是经再生利用已经成为反映一个国家活性炭工业水平的重要标志。

 

三、活性炭目数与吸附力

    我国已跃升为世界上最大的活性炭生产和出口国,活性炭检测方法对产品的评价,检测标准的统一,内外贸易质量纠纷处置等,无疑是十分重要的。目前国内评价活性炭大多采用碘值、亚甲蓝值等指标,但在工程实践上,不仅需要考虑粉末活性炭的总吸附比表面积,还要判断粉末活性炭颗粒内部的孔径分布是否容易达到快速吸附、使用过程中粉末活性炭是否达到吸附平衡,另外还需考虑炭粉粒径的大小,目数小的粉末活性炭的吸附比表面积小,吸附效果差一些,目数大的比表面积大,吸附效果将好一些,但目数太大有可能穿透滤池。

   活性炭目数指的就是筛网密度,活性炭颗粒的大小就用目数来表示。比如煤质颗粒活性炭,木质颗粒活性炭,果壳颗粒活性炭都是用目数表示。

      目数越大说明颗粒越小,一般超过100目,活性炭颗粒就趋于粉末了,但是其实还是颗粒;目数越小,则活性炭颗粒越大,比如8目数-12目数的活性炭颗粒就很大。

所谓目数,是指物料的粒度或粗细度。一般定义是指在1英寸*1英寸的面积内的筛网,物料能通过该筛网,筛网的孔数即定义为目数。如200目,就是该物料能通过1英寸*1英寸内有200个网孔的筛网。以此类推,目数越大,说明物料粒度越细;目数越小,说明物料粒度越大。筛分粒度就是颗粒可以通过筛网的筛孔尺寸,以1英寸(25.4mm)宽度的筛网内的筛孔数表示,因而称之为目数。

     一般来说,活性炭单位体积中目数越多,接触空气面积最大,吸附性越好。这个是有限度的,例如竹炭。孔大,目数少,接触面积小。椰壳活性炭,目数多,接触面积大,效果好。煤炭经过提炼成的活性炭只能用于工业使用。拿同样的5-10目和10-24目的净水炭来说,同样重量下,10-24目的活性炭接触面积大,净化效果好,但是他的流速慢,净水量少,如果装在净水设备中,小设备用小颗粒,大设备用大颗粒。

   活性炭目数可通过换算表格直接换算出颗粒粒径大小,由此可了解活性炭的粒径大小。活性炭的国家标准中明确规定粒度分布和有效粒度的范围,由此可见活性炭质量检测中粒度检测成为检测标准之一。

四、活性炭粒度检测

    颗粒粒度的测量方式很多种,近年来实验室最常用的激光粒度检测因其测试速度快、重复性好、测量范围宽等显著特点成为世界流行的颗粒测试仪器。活性炭在显微镜下观察有长条状,并且粒径较大,样品不易团聚。此样品随着超声时间的延长,粒度逐渐变小,样品易被超碎,不易长时间超声,超声一分钟可以保存数据。经过多次测试对比,测试结果稳定。测试报告如下:

 

激光粒度仪在活性炭粒度检测中的应用

浏览次数:19 日期:2015年11月23日 08:49
 

 

一、    活性炭及应用

活性炭又称活性炭黑。是黑色粉末状或颗粒状的无定形碳。活性炭主成分除了碳以外还有氧、氢等元素。活性炭是具有孔隙结构发达、比表面积大、选择性吸附能力强的碳质吸附材料。在一定的条件下,对液体或气体的某一或某些物质进行吸附脱除、净化、精制或回收,从而实现产品的精制和环境的净化(蒋剑春,2010)。时至今日,活性炭已经被广泛应用于工业、农业、国防、交通、食品、医药、环境保护等各个领域,并且活性炭使用失效后可以用各种办法进行多次反复再生。

活性炭主要是以木炭、木屑、各种果壳、煤炭和石油焦等高含碳物质为原料,经碳化和活化而制得的多孔性吸附剂。活性炭的吸附大多数是物理吸附,即范德华吸附,也有化学吸附。

 

二、活性炭发展现状及发展前景:

中国活性炭在应用历史上简单分为三个阶段:第一阶段是20世纪40年代以前,中国制药工业、化学工业中使用活性炭量大,都用进口货。第二阶段自20世纪50年代初开始,国产活性炭上市.生产与应用相互促进,活性炭的应用范围被迅速开拓。中国活性炭的应用,不仅在国内市场发展,而且进入了国际市场。第三阶段2003-至今;活性炭应用于装修污染治理,专用于吸附甲醛、苯系物、氨、氡等所有对人体有害的气体及空气中的浮游细菌。目前市场上家用活性炭众多,活性炭已走进千家万户,成为健康时尚的环保产品。

传统活性炭大都用于废气废水处理。目前,随着高比面积超级活性炭的面世,人们也试图把它利用到人体上。

活性炭无粉尘技术的开发及应用问题一直是业内人士特别关注的。但是,无论是以煤为原料,还是以果壳或是木材为原料所生产的不定型颗粒活性炭、圆柱形活性炭还是球形活性炭都无法彻底地清除掉其表面上附着的粉尘,特别是无法在基本保持活性炭原有的吸附特性的前提下清除活性炭表面上附着的粉尘。长期以来,市场一直在呼唤的活性炭无粉尘化技术至今未能研制成功。因此,这方面的发展也有一定的前景。

这些年来,世界上主要活性炭生产国美国、日本等都已经把着眼点转向活性炭再生技术开发方面,活性炭使用一次后丢弃还是经再生利用已经成为反映一个国家活性炭工业水平的重要标志。

 

三、活性炭目数与吸附力

    我国已跃升为世界上最大的活性炭生产和出口国,活性炭检测方法对产品的评价,检测标准的统一,内外贸易质量纠纷处置等,无疑是十分重要的。目前国内评价活性炭大多采用碘值、亚甲蓝值等指标,但在工程实践上,不仅需要考虑粉末活性炭的总吸附比表面积,还要判断粉末活性炭颗粒内部的孔径分布是否容易达到快速吸附、使用过程中粉末活性炭是否达到吸附平衡,另外还需考虑炭粉粒径的大小,目数小的粉末活性炭的吸附比表面积小,吸附效果差一些,目数大的比表面积大,吸附效果将好一些,但目数太大有可能穿透滤池。

   活性炭目数指的就是筛网密度,活性炭颗粒的大小就用目数来表示。比如煤质颗粒活性炭,木质颗粒活性炭,果壳颗粒活性炭都是用目数表示。

      目数越大说明颗粒越小,一般超过100目,活性炭颗粒就趋于粉末了,但是其实还是颗粒;目数越小,则活性炭颗粒越大,比如8目数-12目数的活性炭颗粒就很大。

所谓目数,是指物料的粒度或粗细度。一般定义是指在1英寸*1英寸的面积内的筛网,物料能通过该筛网,筛网的孔数即定义为目数。如200目,就是该物料能通过1英寸*1英寸内有200个网孔的筛网。以此类推,目数越大,说明物料粒度越细;目数越小,说明物料粒度越大。筛分粒度就是颗粒可以通过筛网的筛孔尺寸,以1英寸(25.4mm)宽度的筛网内的筛孔数表示,因而称之为目数。

     一般来说,活性炭单位体积中目数越多,接触空气面积最大,吸附性越好。这个是有限度的,例如竹炭。孔大,目数少,接触面积小。椰壳活性炭,目数多,接触面积大,效果好。煤炭经过提炼成的活性炭只能用于工业使用。拿同样的5-10目和10-24目的净水炭来说,同样重量下,10-24目的活性炭接触面积大,净化效果好,但是他的流速慢,净水量少,如果装在净水设备中,小设备用小颗粒,大设备用大颗粒。

   活性炭目数可通过换算表格直接换算出颗粒粒径大小,由此可了解活性炭的粒径大小。活性炭的国家标准中明确规定粒度分布和有效粒度的范围,由此可见活性炭质量检测中粒度检测成为检测标准之一。

四、活性炭粒度检测

    颗粒粒度的测量方式很多种,近年来实验室最常用的激光粒度检测因其测试速度快、重复性好、测量范围宽等显著特点成为世界流行的颗粒测试仪器。活性炭在显微镜下观察有长条状,并且粒径较大,样品不易团聚。此样品随着超声时间的延长,粒度逐渐变小,样品易被超碎,不易长时间超声,超声一分钟可以保存数据。经过多次测试对比,测试结果稳定。测试报告如下:

 

TypeInfo: Industry News

Keywords for the information:laser particle size analyzer 

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