铬鞣污泥循环利用的研究

发布时间：2018-06-12 01:42

  本文选题：铬鞣污泥 + 铬鞣剂　； 参考：《陕西科技大学》2015年硕士论文

【摘要】：皮革生产中的含铬废水处理往往会产生铬鞣污泥,铬鞣污泥的铬含量大,并含有丰富的胶原蛋白多肽类物质,是一种极具利用价值的可再生资源。本文针对山东省滨州市沾化工业园区的铬鞣污泥,分别采用了循环法和高温焙烧法两种方法提取了铬鞣污泥中的三价铬,并应用于一浴铬鞣。其中在循环法提取铬资源的基础上,进一步萃取出了铬鞣污泥中的胶原蛋白多肽,并将改性后的胶原蛋白多肽应用于纸张增强剂。本文采用两种方法提取铬鞣污泥中的三价铬,并分别研究了这两种方法的最佳工艺条件和应用,主要研究结果如下:(1)循环法:对富铬污泥中铬的提取作了研究,确定了分离剂和提取剂的配方,选择了分离和提取铬的最佳工艺条件。将富铬污泥中的铬提取为Cr2(SO4)3,并将其应用于皮革工业中的一浴铬鞣。结果表明:鞣制的牛皮蓝湿革收缩温度大于98℃,手感丰满,从而为富铬污泥的回收利用提供了行之有效的途径。(2)高温焙烧法:利用马弗炉高温加热分解铬鞣污泥中的油脂、胶原蛋白多肽,释放出铬鞣污泥中的铬并加以回收。其最佳的试验条件为:加热温度750℃,加热时间3 h。高温分解后的铬渣浸于p H=2.0的稀H2SO4溶液,减压抽滤后得到纯化铬液,铬回收率超过98%,有机物成分低于0.2%。纯化铬液配制成质量分数为3.5%(以Cr2O3计)的铬鞣剂鞣制皮革,牛皮蓝湿革收缩温度大于98.5℃,手感柔滑、丰满,质地均匀。在抄造纸张的过程中,多肽直接加入易使纸张发生卷曲,影响纸张的整体强度指标,所以需要对多肽进行改性。故本试验探讨以阳离子型聚丙烯酰胺作为改性原料,改性胶原蛋白多肽可以增强纸张强度。提取胶原蛋白多肽的工艺条件及应用于纸张增强剂的研究结果如下:通过对铬鞣污泥进行酸性预处理,完成铬与污泥的有效分离;在超声协助下,用氢氧化钠和氧化钙的混合溶液提取出胶原蛋白多肽原液。用甲苯萃取出胶原蛋白多肽,胶原蛋白多肽液中Cr2O3含量低于70 mg/kg,灰分含量低于3%,胶原蛋白多肽提取率达40%。聚乙烯醇作为分散剂,胶原蛋白多肽液(CPL)经过阳离子型聚丙烯酰胺改性,形成的改性胶原蛋白多肽液对纸张增强作用明显。当改性胶原蛋白多肽液用量为1.5%(对绝干浆)时,纸张抗张指数提高26.7%,耐破指数提高47.2%。
[Abstract]:Chrome tanning sludge is often produced in the treatment of chrome containing waste water in leather production. The chrome tanning sludge contains a large amount of chromium and abundant collagen polypeptides. It is a renewable resource with great value. In this paper, chromium tanning sludge from Zhanhua Industrial Park of Binzhou City, Shandong Province, was extracted from chrome tanning sludge by recycling method and high temperature roasting method, and was applied to one bath chrome tanning. The collagen peptide from chrome tanning sludge was extracted by recycling method, and the modified collagen peptide was used as paper enhancer. In this paper, two methods were used to extract trivalent chromium from chrome tanning sludge, and the optimum technological conditions and application of the two methods were studied respectively. The main results are as follows: the extraction of chromium from chromium-rich sludge was studied. The formula of separation agent and extraction agent was determined, and the optimum technological conditions for separation and extraction of chromium were selected. Chromium from chromium-rich sludge was extracted as Cr _ 2so _ 4 so _ 4 ~ (3) and applied to one bath chrome tanning in leather industry. The results showed that the shrinkage temperature of tanned blue wet leather was more than 98 鈩，

本文编号：2007682