洗沙厂
Sand Washing Plant
 
聚丙烯酰胺在洗沙厂中的应用及技术指标
Application and specification:      洗沙厂的泥浆水是一种水中含有一定量的微细泥颗粒的悬浮液体.泥浆的特性取决于它的成分，和当地的地质条件有关，一般特性是泥浆外观为土黄色，均匀有粘性，长时间静止不分层，比重在1.20～1.46之间(其中黄沙比重1.6);含泥量20%～30%，PH值：6～7。这些泥浆来源于建筑打桩、沙场、隧道山洞、矿山尾矿等。  
The slurry water of a sand washing plant is a suspension liquid containing a certain amount of fine mud particles in water. The characteristics of the slurry depend on its composition and local geological conditions. The general characteristics of the slurry are that the appearance of the slurry is yellowish, uniform and viscous, and the slurry is stationary for a long time without stratification, and its specific gravity is between 1.20 and 1.46 (of which, the specific gravity of yellow sand is 1.6); the slurry content is 20%-30%, and the PH value is between 6 and 7. These muds come from building piling, sand field, tunnel cave, mine tailings and so on.  
     目前砂机制砂的工艺流程为：将河沙或矿石经破碎机械破碎,通过洗砂设备，对沙石冲洗，得到含泥量教少的细沙。这种工艺产生大量的污水，主要污染物为泥沙~~其中泥渣悬浮于水中，较难沉降，直接排放对水体污染严重，目前业内采用的沉淀池法占地面积大，处理时间长，沉渣提取不易，槽罐车外运法，费用高，不能从根本上解决问题。
   At present, the technological process of sand machine-made sand is to break river sand or ore by crushing machine, wash sand and stone through sand washing equipment, and get fine sand with less mud content. This process produces a large amount of sewage. The main pollutant is sediment, in which sludge is suspended in water, which is difficult to settle, and directly discharged to the water body. At present, the sediment tank method used in the industry covers a large area, takes a long time to process, is not easy to extract sediment, and the tank truck transportation method is expensive, which can not fundamentally solve the problem.
     而近年来大部分采用该种工艺系统泥浆水收集沉淀池，二沉池，清液池，泥砂分离系统，加药系统，排水系统，排渣系统。
In recent years, collecting sedimentation tank, secondary sedimentation tank, clear liquid tank, mud and sand separation system, dosing system, drainage system and slag discharge system are mostly used.
     其工作原理为：泥浆水通过管道收集流入沉淀池，通过泥浆脱水机预处理，去除泥浆水中的大部分细沙及部分泥浆，滤液经排水系统进入二沉池。二沉池的泥浆水为悬浮泥浆，与水的比重差很小，须加絮凝剂处理，泥浆水经脱水机处理后，泥砂支除率百分之九十五以上，清液池中的水可直接回到洗砂系统中，真正做到零排放。
Working principle: mud water is collected by pipeline and flowed into sedimentation tank, and pretreated by mud dehydrator to remove most fine sand and part of mud in mud water. The filtrate enters secondary sedimentation tank through drainage system. The slurry water in the secondary clarifier is suspended slurry, which has little difference in proportion to water. Flocculant must be added to treat the slurry water. After the slurry water is treated by a dewaterer, the removal rate of mud and sand is more than 95%. The water in the clarifier can be directly returned to the sand washing system to achieve zero discharge.
 
     经我公司专业人员与其他公司产品对比后得出结论。该系统废水处理用到我厂生产的专用药剂比原来节省40%左右的成本。该药剂的单位处理成本很低，回报率较高。
After comparing the our products with other companies, we draw a conclusion. This system can save about 40% of the cost by using our factory special chemicals for wastewater treatment. The unit cost of treatment is very low and the rate of return is high.