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粒径会影响活性炭强度吗

2018-01-09 10:50:11 露丰水处理 阅读

    活性炭是一种黑色多孔的固体炭质,主要质料简直可所以一切富含碳的有机资料,如煤、木材、果壳、椰壳、核桃壳等。这些含碳资料在活化炉中,在高温文必定压力下经过热解效果被转换成活性炭。在此活化过程中,巨大的外表积和杂乱的孔隙结构逐步构成,而所谓的吸附过程正是在这些孔隙中和外表上进行的,活性炭中孔隙的巨细对吸附质有挑选吸附的效果,这是因为大分子不能进入比它孔隙小的活性炭孔径内的原因。

一、活性炭机械特性:

    ⑴粒度:选用一套标准筛筛分法,求出留在和经过每只筛子的活性炭分量,表明粒度散布。

    ⑵静观密度或堆密度:饮食孔隙容积和颗粒间空地容积的单位体积活性炭的分量。

    ⑶体积密度和颗粒密度:饮食孔隙容积而不饮食颗粒间空地容积的单位体积活性炭的分量。

    ⑷强度:即活性炭的耐破碎性。

    ⑸耐磨性:即耐磨损或抗磨擦的性能。

这些机械性质直接影响活性炭应用,例如:密度影响容器巨细;粉炭粗细影响过滤;粒炭粒度散布影响流体阻力和压降;破碎性影响活性炭使用寿命和废炭再生。

二、活性炭化学特性:

    活性炭的吸附除了物理吸附,还有化学吸附。活性炭的吸附性既取决于孔隙结构,又取决于化学组成。

    活性炭不仅含碳,并且含少数的化学结合、功用团开工的氧和氢,例如羰基、羧基、酚类、内酯类、醌类、醚类。这些外表上含有的氧化物和络合物,有些来自质料的衍生物,有些是在活化时、活化后由空气或水蒸气的效果而生成。有时还会生成外表硫化物和氯化物。在活化中质料所含矿物质会集到活性炭里成为灰分,灰分的主要成分是碱金属和碱土金属的盐类,如碳酸盐和磷酸盐等。这些灰分含量可经水洗或酸洗的处理而下降。

三、活性炭注意事项:   

    1、活性炭在运送过程中,避免与坚固物质混状,不行踩、踏,以防炭粒破碎,影响质量。  

    2、贮存应贮存于多孔型吸附剂,所以在运送贮存和使用过程中,都要绝对避免水浸,因水浸后,很多水充溢活性空地,使其失掉效果。  

    3、避免焦油类物质在使用过程中,应禁止焦油类物质带入活性炭床,避免阻塞活性炭空地,使其失掉吸附效果。最好有除焦设备净化气体。  

    4、防火活性炭在贮存或运送时,避免与火源直接触摸,以防着火、活性炭再生时避免进氧并再生彻底,再生后必须用蒸汽冷却降至80℃以下,不然温度高,遇氧,活性炭自燃。


Activated carbon is a porous solid carbon black, the main raw material can be almost all carbon-rich organic materials, such as coal, wood, fruit shell, coconut shell,

walnut shell, etc. These carbon materials in the activation furnace, by pyrolysis under high temperature and pressure is converted into activated carbon. In the

activation process, large surface area and complicated pore structure gradually formed, and the adsorption process is conducted on the porosity and surface, the size

of the pores in the activated carbon has the effect of selective adsorption to the adsorbate, this is because the large molecules cannot enter within the activated

carbon pore size is smaller than its porosity.


A, activated carbon mechanical properties:


Size: (1) using a set of standard sieve sieve method, formed by each sieve activated carbon and stay in weight, particle size distribution.


(2) watch density or bulk density: diet gap between pore volume and particle volume per unit volume of the weight of the active carbon.


(3) bulk density and particle density: eating pore volume without gap between particles volume per unit volume of the weight of the active carbon.


(4) strength: crushing resistance of active carbon.


5] to wear: namely, wear resistance and friction resistant performance.


These mechanical properties directly affect the activated carbon applications, such as: density affects the container size; Powder coal thickness affect filtering; The

coal particle size distribution affects the fluid resistance and pressure drop; Fragmentation affects the service life of activated carbon and carbon regeneration.


Second, the chemical characteristics of activated carbon:


Activated carbon adsorption in addition to physical adsorption and chemical adsorption. Activated carbon adsorption depends on the pore structure, and depends on the

chemical composition.


Activated carbon not only, and contains a small amount of chemical combination and functional group construction of oxygen and hydrogen, such as carbonyl and carboxyl,

phenols, lactones, quinones, ether. On the surface of oxides and complex, some derivatives from raw materials, some of them are at the time of activation, activated

after generated by air or steam. Sometimes generate surface sulphate and chloride. Raw material contained in the activation of mineral concentration to become the ash

content in the activated carbon, the main composition of ash is alkali metal and alkaline earth metal salts, such as carbonate and phosphate. The ash content can be

reduced by water or acid treatment.


Third, activated carbon to note:


1, the activated carbon in the process of transportation, prevent and hard material mix, do not step on, step, in case of carbon particle breakage, affect the quality.


2, storage should be stored in the groove adsorbent, more so in the process of transportation storage and use, will absolutely prevent water immersion, due to

flooding, after a lot of water is full of activity space, lose its effect.


3, prevent tar material in use process, should be prohibited from tar class material to the activated carbon bed, lest jam activated carbon, lose its adsorption. It is

better for decoking equipment to purify the gas.


4, fire activated carbon during storage or transportation, avoid direct contact with fire, in case of fire, into the oxygen and regeneration completely avoid when

activated carbon regeneration, regeneration after have to use steam cooling down to under 80 ℃, otherwise the temperature is high, meet oxygen, activated carbon

combustion.


Four, activated carbon packing: 25 kg woven bag packaging, can be customized as required.

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