CN111068535B - 改性沥青喷淋污水净化渣的干化回收利用方法 - Google Patents

改性沥青喷淋污水净化渣的干化回收利用方法 Download PDF

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CN111068535B
CN111068535B CN201911268292.6A CN201911268292A CN111068535B CN 111068535 B CN111068535 B CN 111068535B CN 201911268292 A CN201911268292 A CN 201911268292A CN 111068535 B CN111068535 B CN 111068535B
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苏醒
袁江宏
苏雷平
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Hunan Xinti Environmental Protection Equipment Technology Consulting Co ltd
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Abstract

本发明的一种改性沥青喷淋污水净化渣的干化回收利用方法，包括以下步骤：（1）将无机矿物粉送入卧式螺旋搅拌机中进行螺旋搅拌，边搅拌边加入块状干渣，搅拌均匀后再加入生石灰粉或/和熟石膏粉，继续搅拌均匀后得到混合物A；（2）将所述混合物A在搅拌速率为1200～3000转/min下进行粉碎，得到细干粉；所述细干粉可以直接作为改性沥青的填充料。本发明得到的细干粉用于改性沥青，不仅减少了固体污染物的排放，而且回收了其中的油份，降低成本，不影响卷材的质量。

Description

改性沥青喷淋污水净化渣的干化回收利用方法
技术领域
本发明为改性沥青技术领域，具体涉及一种改性沥青喷淋污水净化渣的干化回收利用方法。
背景技术
改性沥青生产过程中会产生大量的沥青烟气，夹杂着水分、石粉与胶粉等，通用的尾气处理方法第1道工序是喷水降温、除尘除油。文献【苏醒，袁江红，等.含油含粉沥青喷淋污水的净化工艺研究[J].中国建筑防水，2019年第2期，43-46.】中详细介绍了含油含粉沥青喷淋污水的净化过程：所用的喷淋水经过污水脱固处理、污水净化机等工序净化之后，返回喷淋罐循环使用；喷淋水中携带的颗粒物和挥发物以乳浊液或悬浊液的形式存在，经无机絮凝和/或高分子絮凝之后，再经过污水净化机将絮凝物作为湿渣排出，然后进入湿渣分离机中脱除湿渣中的油分和水分，得到块状干渣。
现今改性沥青生产领域一般与有资质固废回收商签订年度合同，定期外包处理块状干渣：一种方式是把块状干渣置于烘房或者太阳下干燥，然后进行粉碎，再加入到配料釜中去回用，但是此方法在烘干或日晒时又有味道散发，污染场地；另一种方式是把块状渣交给生产重质碳酸钙的厂家，与石头掺和，一起粉碎，再运回沥青卷材厂回收使用，此方法能达到100%回用，但是毕竟生产重钙的厂家少，而沥青卷材厂分散，不便于及时处理回用。
随着我国改性沥青行业的高速发展，行业集中度加快，工艺污水处理产生块状干渣的产量增大，因此及时处理，减少堆放时间，避免二次污染，就地回收利用非常必要、而且各厂家的呼声很大。
发明内容
本发明的目的是提供了一种改性沥青喷淋污水净化渣的回收利用方法，以解决现有技术中存在的堆放时间长、散放造成二次污染的问题。
本发明的目的是这样实现的：
一种改性沥青喷淋污水净化渣的干化回收利用方法，其特征在于，包括以下步骤：
（1）将无机矿物粉送入卧式螺旋搅拌机中进行螺旋搅拌，边搅拌边加入块状干渣，搅拌均匀后再加入生石灰粉或/和熟石膏粉，继续搅拌均匀后得到混合物A；
（2）将所述混合物A在搅拌速率为1200～3000转/min下进行粉碎，得到细干粉；所述细干粉可以直接作为改性沥青的填充料；
所述块状干渣中含有15%～55%的水分、5%～20%的油分和40%～70%的无机石粉、聚合氯化铝（PAC）、聚丙烯酰胺（PAM）絮体和少量可挥发性杂质；
所述无机矿物粉为重质碳酸钙粉、滑石粉、粉煤灰中的一种或两种以上的混合物；优选的，所述无机矿物粉的粒径为100目以上；
所述无机矿物粉的添加量为所述块状干渣重量的20%～100%；所述无机矿物粉与所述生石灰粉或/熟石膏粉的添加重量比为1：（0.5～2.5）。
进一步地，所述步骤（1）中，单用生石灰粉的用量比单用熟石膏的用量少60%wt～70%wt。
进一步地，所述细干粉的细度≥60目，含水率≤2%wt，无机固体物的含量≥90%wt，含油率≤10%wt。
本发明采用卧式螺旋搅拌机进行螺旋搅拌，便于块状干渣与无机矿物粉的低阻力掺混；无机矿物粉的比表面积很大，可以吸收块状干渣中的水分、油分和其它可挥发分；生石灰粉中含有的CaO可以与块状干渣中的水分发生反应生成Ca(OH)2，不仅可以消耗水分，释放出热量，生成的Ca(OH)2还可以继续与油分和可挥发性杂质（如CO2、SO2、SO3、腐殖酸）等反应，降低产品中杂质的含量；利用化合物或者无机矿物粉的可生成结晶水、需要水参与反应的原理来降低或锁定固废物的水粉，防止在回用时在160～230℃的高温下再蒸发。本发明得到的细干粉用于改性沥青，不仅减少了固体污染物的排放，而且回收了其中的油份，降低成本，不影响卷材的质量。
具体实施方式
本技术领域的一般技术人员应当认识到本实施例仅是用来说明本发明，而并非用作对本发明的限定。
实施例1
（1）将粒径为600目的10kg重质碳酸钙粉和粒径为300目的10kg滑石粉送入卧式螺旋搅拌机中进行螺旋搅拌，边搅拌边加入40kg块状干渣（块状干渣中含有47%的水分、13%的油分和40%的无机石粉、PAC、PAM絮体和少量可挥发性杂质），搅拌均匀后再加入10kg生石灰粉和14kg熟石膏粉，继续搅拌均匀后得到混合物A；
（2）将所述混合物A在搅拌速率为1500转/min下进行粉碎，得到细干粉；细干粉的细度100目，含水率1.2%wt，无机固体物的含量96.2%wt，含油率2.6%wt，所述细干粉可以直接作为改性沥青的填充料。
实施例2
（1）将粒径为500目的5kg粉煤灰和粒径为300目的5kg滑石粉送入卧式螺旋搅拌机中进行螺旋搅拌，边搅拌边加入50kg块状干渣（块状干渣中含有23%的水分、7%的油分和70%的无机石粉、PAC、PAM絮体和少量可挥发性杂质），搅拌均匀后再加入15kg生石灰粉，继续搅拌均匀后得到混合物A；
（2）将所述混合物A在搅拌速率为2300转/min下进行粉碎，得到细干粉；细干粉的细度100目，含水率0.9%wt，无机固体物的含量97%wt，含油率2.1%wt，所述细干粉可以直接作为改性沥青的填充料。
实施例3
（1）将粒径为1000目的10kg重质碳酸钙粉和粒径为300目的10kg粉煤灰送入卧式螺旋搅拌机中进行螺旋搅拌，边搅拌边加入25kg块状干渣（块状干渣中含有36.8%的水分、16.7%的油分和46.5%的无机石粉、PAC、PAM絮体和少量可挥发性杂质），搅拌均匀后再加入13kg生石灰粉和30kg熟石膏粉，继续搅拌均匀后得到混合物A；
（2）将所述混合物A在搅拌速率为3000转/min下进行粉碎，得到细干粉；细干粉的细度100目，含水率1.4%wt，无机固体物的含量96.9%wt，含油率1.7%wt，所述细干粉可以直接作为改性沥青的填充料。
实施例4
（1）将粒径为800目的25kg滑石粉送入卧式螺旋搅拌机中进行螺旋搅拌，边搅拌边加入25kg块状干渣（块状干渣中含有52%的水分、8%的油分和40%的无机石粉、PAC、PAM絮体和少量可挥发性杂质），搅拌均匀后再加入35kg熟石膏粉，继续搅拌均匀后得到混合物A；
（2）将所述混合物A在搅拌速率为3000转/min下进行粉碎，得到细干粉；细干粉的细度100目，含水率1.4%wt，无机固体物的含量96.9%wt，含油率1.7%wt，所述细干粉可以直接作为改性沥青的填充料。

Claims (4)

1.一种改性沥青喷淋污水净化渣的干化回收利用方法，其特征在于，包括以下步骤：
（1）将无机矿物粉送入卧式螺旋搅拌机中进行螺旋搅拌，边搅拌边加入块状干渣，搅拌均匀后再加入生石灰粉或/和熟石膏粉，继续搅拌均匀后得到混合物A；
（2）将所述混合物A在搅拌速率为1200～3000转/min下进行粉碎，得到细干粉；所述细干粉可以直接作为改性沥青的填充料；
所述无机矿物粉的添加量为所述块状干渣重量的20%～100%；所述无机矿物粉与所述生石灰粉或/熟石膏粉的添加重量比为1：（0.5～2.5）；
所述块状干渣中含有15%～55%的水分、5%～20%的油分和40%～70%的无机石粉、聚合氯化铝、聚丙烯酰胺絮体和少量可挥发性杂质；所述无机矿物粉为重质碳酸钙粉、滑石粉、粉煤灰中的一种或两种以上的混合物。
2.根据权利要求1所述的改性沥青喷淋污水净化渣的干化回收利用方法，其特征在于，所述无机矿物粉的粒径为100目以上。
3.根据权利要求1所述的改性沥青喷淋污水净化渣的干化回收利用方法，其特征在于，所述步骤（1）中，单用生石灰粉的用量比单用熟石膏的用量少60%wt～70%wt。
4.根据权利要求1所述的改性沥青喷淋污水净化渣的干化回收利用方法，其特征在于，所述细干粉的细度≥60目，含水率≤2%wt，无机固体物的含量≥90%wt，含油率≤10%wt。
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