高灰浮选尾煤制备高岭土工艺试验研究  

Experimental study of the technological process for recovery of kaolin from flotation tailings

作　　者：邓明瑞 DENG Mingrui(CCTEG Tangshan Research Institute,Tangshan 063012,China;School of Chemical Engineering and Technology,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]中煤科工集团唐山研究院有限公司,河北唐山063012 [2]中国矿业大学化工学院,江苏徐州221116

出　　处：《选煤技术》2023年第2期47-53,共7页Coal Preparation Technology

基　　金：唐山市重点科技计划项目(19150249E)。

摘　　要：为扩展浮选尾煤的综合利用方式,实现浮选尾煤中有价矿物的高附加值利用,提出一种新的思路——从浮选尾煤中回收高岭土。以唐山地区选煤厂高灰浮选尾煤为研究对象,基于其矿物组成、粒度组成分析,设定了从中回收制备陶瓷(搪瓷)用高岭土的目标。通过考察载体浮选,选择性絮凝、高梯度磁选、化学漂白等方法,得出:选择性絮凝效果较差,而载体浮选,可有效降低铁、钛含量,同时提高尾煤灰分,进而保证铝含量;单独使用高梯度磁选可有效降低铁含量,但对钛含量降低效果较为一般;单独使用化学漂白虽然对铁的脱除效果较好,但对钛的脱除较差。将不同分选方式组合,并设定分选流程,最终产品指标为:铝含量为31.55%,铁含量为1.59%,钛含量为0.59%,均满足对TC-3级产品的要求。In order to expand the flotation tailings comprehensive utilization mode and realize high valueadded utilization of valuable minerals in tailings,a new idea of realizing kaolin from flotation tailings is proposed,and the tailings from coal preparation plants in Tangshan area is taken as the object of study.Based on analysis of both mineral and size compositions of the tailings,it is targeted to recover the kaolin for use as porcelain and enamel making material.To achieve the goal,comparative experiments are conducted using carrier flotation,selective flocculation,high-gradient magnetic separation and chemical bleaching methods.As demonstrated by results of experiments,among the different methods used,the selective flocculation method is far inferior to the other ones in effect;the use of the carrier flotation method can lead to effective reduction of contents of iron and titanium,increase of ash of tailings and hence increase of content of aluminum;the use of the high-gradient magnetic method alone can produce a remarkable effect in reduction of iron content yet a less satisfactory effect in reduction of titanium content;and the chemical bleaching process when used alone can lead to effective removal of iron yet a relatively poor result in removal of titanium.Through the use of combined methods,and designed separation process flowsheet,a final product with a content of aluminum of 31.55%,an iron content of 1.59%and titanium content of 0.59%can be obtained,which is well up to the national standard-specified requirements for the class TC-3 products.

关 键 词：尾煤综合利用 高岭土制备 高灰浮选尾煤 高梯度磁选 载体浮选 化学漂白 

分 类 号：TD946.4[矿业工程—选矿]