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颗粒白土知识简介
一、白土生产原料
颗粒白土的原料为膨润土(英文名 Bentonite)。膨润土是以蒙脱石为主要成 份的粘土矿物, 其成分一般为 (Na,Ca) (Al,Mg)(Si4O10) 0.33 2 (OH) 2·nH2O 蒙脱石是由二层共顶联接的硅氧四面体片夹一层共棱联接的铝(镁)氧(氢氧) 八面体片,构成 2:1 型含结晶水的硅酸盐矿物。

(原料厂)

二、生产原理
膨润土经过活化,酸化等工艺可以形成吸附性强,多色,多烯烃的特殊晶体 结构,其生产原理如下: 以膨润土和硫酸水溶液通过加热加压进行活化反应,活化反应的实质,是膨 润土中的碱金属成分被抽出,形成 SiO2 、Al2O3 特殊结构比例,同时生成一 些可溶性硫酸盐,增加比表面积,形成蜂窝状孔结构,在复合活性组分,形成各 种专用颗粒白土。

三、主要工艺工程

1. 选矿: 根据地质结构和实地勘察, 考察白土矿的质 量,选膨润土含蒙脱石大于 80%的矿源,然后 选择样品进行模拟实验,根据模拟实验得出的 脱烯烃能力,确定最终的选矿结果。原料矿和 产品的比率大约在 1/7。

2. 破碎: 选择开采出的白土矿,去除杂质,送入粉碎机进行粉碎,破碎矿料粒径≤ 50mm。进入下步工序。

3. 烘干/焙烧 粉碎后的白土颗粒原料送入回转炉进行 烘干,烘干温度分为 200 摄氏度,烘干水分 小于 6%, 时间控制大约在 20 分钟; 再在 350 摄氏度左右进行焙烧,时间控制大约在 30 分 钟。

4. 酸化 烘干后的物料进入到反应釜加入 H2SO4,

进行酸化反应,酸化的目的是为了去掉原料里的 Ca+等含盐成分,反应时间大 约在 6-10 个小时,反应温度控制在 130 摄氏度左右。

5. 活化 去除水分的物料,需要进行活化反应,活 化反应为白土处理中的核心控制工序, 在反应 釜中加入一定量的 HCL 或者 H3SO4 等,在 加热到 100 摄氏度左右的工况下进行 1 小时 左右,加入酸的浓度为 15~25%。活化反应 是膨润土中的碱金属成分被抽出,形成 SiO2 、Al2O3 特殊结构比例,同时生 成一些可溶性硫酸盐,增加白土的比表面积,形成蜂窝状孔结构,能后进行有效 的烯烃吸附。

6. 水洗 反应后的物料,需要进行水洗,水洗分为 一次水洗、二次水洗和三次水洗,水洗的目的 是为了控制物料里的 H+组分, 值等参数, PH 水洗后的 PH 控制在 PH<4。

7. 烘干 水洗后的物料还需要进行进一步烘干, 去 掉含有的水分,水分控制在 3~6%;此工序与

第 3 工序的区别是:烘干炉没有焙烧设备。

8. 筛选 烘干后的产品进行筛选,选择颗粒度大小合适的作为产品,大于 2mm 的颗 粒数,小于 5%,小于 0.25mm 颗粒数,小于 5%。

四、白土产品

Item Specific Surface Area, m /g Pore volume, ml/g ≥ ≤ 0.20
2

YBT-05 ≥ 350 0.35 2.0 (Base H2SO4) 5.0 5.0 8.0 0.68~0.78 1.0

Initial Activity, mgBr/100g Free Acid, % ≤

Beyond 2.0mm,% ≤ Mesh Below 0.25mm,% ≤ ≤

Moisture, % Bulk density, g/ml

Crush strength , N ≥



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