摘要
为了合理高效开发云南某高岭土矿资源,基于矿石性质分析,分别采用连二亚硫酸钠和二氧化硫脲2种还原剂开展增白试验研究。针对粒度-0.020 mm的高岭土样品,确定二氧化硫脲漂白适宜的工艺条件为矿浆浓度20%、二氧化硫脲用量2.0%、矿浆pH值13、草酸用量5%、反应温度30℃、反应时间20 min。在此条件下,高岭土中Fe_(2)O_(3)含量从0.95%降低至0.70%,除铁率达26.32%,自然白度由65.0%提高至83.5%。与连二亚硫酸钠相比,除铁率提高了11.58个百分点,自然白度提高了9.1个百分点。二氧化硫脲在加热或被碱催化时产生强还原性的次硫酸,次硫酸将高岭土中不溶性铁还原为可溶性亚铁后除去,进而提升砂质高岭土的白度。相较于二亚硫酸钠,二氧化硫脲除铁效果好、化学性质稳定且环境污染小,可用于同类型高岭石的除铁增白。
In order to develop a kaolin ore resource in Yunnan Province reasonably and efficiently,two reducing agents,sodium disulfite and urea sulfur dioxide,were used to carry out whitening tests based on the analysis of ore properties.For kaolin samples with particle size of-0.020 mm,the optimum bleaching conditions of urea sulfur dioxide were determined as pulp concentration of 20%,urea sulfur dioxide content of 2.0%,pulp pH value of 13,oxalic acid content of 5%,reaction temperature of 30℃,reaction time of 20 min.Under the conditions,the Fe_(2)O_(3) content of kaolin decreases from 0.95%to 0.70%,the iron removal rate reaches 26.32%,and the natural whiteness increases from 65.0%to 83.5%.Compared with sodium disulfite,iron removal rate increased by 11.58 percentage points and natural whiteness increased by 9.1 percentage points.When urea sulfur dioxide is heated or catalyzed by alkali,strong reducing hyposulphuric acid is produced.Hyposulphuric acid reduces insoluble iron in kaolin to soluble ferrous iron and then removes it,thus improving the whiteness of sandy kaolin.Compared with sodium disulfite,urea sulfur dioxide has good iron removal effect,stable chemical properties and less environmental pollution.It can be used to remove iron and whiten kaolinite of the same type.
作者
李航
管俊芳
杨成亮
王路路
廖敏
丁定
LI Hang;GUAN Junfang;YANG Chengliang;WANG Lulu;LIAO Min;DING Ding(School of Resources and Environmental Engineering,Wuhan University of Technology,Wuhan 430070,China;Chonfar Engineering and Technology Co.,Ltd.,Changsha 410116,China)
出处
《金属矿山》
CAS
北大核心
2023年第3期152-156,共5页
Metal Mine
