内蒙某伊利石粘土矿的分级与利用
发布时间：2019-04-29 06:36
【摘要】：我国伊利石分布广、储量大、品质优良。虽然伊利石在很多方面已有成功应用,但以伊利石为原料制备絮凝剂还未见报道。我国水资源匮乏,污水总量持续增加,污水处理刻不容缓,作为水处理关键环节絮凝沉淀所用药剂-絮凝剂的研究有待进一步加强。伊利石属于高铝粘土,以伊利石为原料,通过湿法沉降去杂后用于聚合氯化铝铁絮凝剂的制备,既可以充分发挥其高铝特性,为伊利石利用开拓了新的思路;也为无机高分子絮凝剂的制备找寻到了新的原料。首先对伊利石原矿进行捣浆试验,获得最佳的捣浆条件为:捣浆速度2000rpm、捣浆时间90min,分散剂用量0.9%;然后对浆液进行自然沉降分级,共分出三个粒级即-2μm、-5μm、-10μm;再分别对这三个粒级进行化学成分、粒度、XRD分析。结果表明,所有三个粒级的石英均已被有效去除,SiO2含量降低,Al2O3含量升高分级效果良好。由于沉降后-10μm粒级的产率特别高在90%以上,且沉降一次只需要19min,经过沉降后的产品Al2O3含量明显增高,所以采用分级后-10μm粒级产品作为下一步制备聚合氯化铝铁絮凝剂的原料。分别采用直接煅烧和加碱(助熔)煅烧法对提纯后的伊利石进行活化试验,结果表明,助熔法有助于伊利石晶体结构的解体和铝的溶出,助溶效果好坏依次为:碳酸钠氟化钠直接煅烧。将伊利石与碳酸钠混合煅烧、并用盐酸进行酸浸试验。通过单因素和正交试验探讨煅烧活化温度、煅烧时间和碱矿比,以及酸浸时的固液比、盐酸浓度、酸浸时间、酸浸温度对伊利石Al浸出率的影响。结果发现,影响伊利石Al浸出率的主次因素顺序为:液固比碱矿比HCl浓度酸浸时间煅烧温度酸浸温度煅烧时间;Al浸出率的优化条件为:煅烧温度900℃、煅烧时间2h、碱矿比4:10、酸浸温度70℃、酸浸时间1h、HCl浓度20%和液固比5:1。在最优实验条件下,酸浸反应滤液的化学成分:Al2O3,22.15(mg/10mL);Fe2O3,1.08(mg/10mL);SiO2,0.24(mg/10mL);TiO2,0.65(mg/10mL)。Al2O3的浸出率为91%。以酸浸滤液为原料,以浊度去除率为指标,制备PAFC。最佳条件为:反应pH=3.5,铝铁比5:1,反应温度80℃,反应时间为3.5h。制备出的固体聚合氯化铝铁产品为棕褐色,产品中Al2O3含量为27.79%、Fe2O3含量为3.84%、盐基度为79.36%;通过IR、TG-DTG、SEM进行表征,产品羟基含量高、聚合度良好,其相关指标均达到企业指标要求。
[Abstract]:In China, Illite is widely distributed, has large reserves and is of good quality. Although Illite has been successfully used in many aspects, the preparation of flocculant with Illite as raw material has not been reported. Due to the shortage of water resources and the continuous increase of the total amount of sewage in China, it is urgent to treat sewage. The research on flocculant-flocculant, which is the key link of water treatment, needs to be further strengthened. Illite belongs to high aluminous clay. Illite is used as raw material to prepare polyaluminum ferric chloride flocculant by wet deposition, which can not only give full play to its high aluminum properties, but also open up a new way of thinking for the utilization of Illite. It also found a new material for the preparation of inorganic polymer flocculant. First of all, the pulping test of Illite ore is carried out. The optimum conditions are as follows: ramming speed is 2000rpm, ramming time is 90min, dispersant dosage is 0.9%; Then the slurry was classified by natural sedimentation, and three particle grades-2 渭 m,-5 渭 m and-10 渭 m were divided into three grades:-2 渭 m,-5 渭 m and-10 渭 m, and then the chemical composition, particle size and XRD analysis of the three particles were carried out respectively. The results showed that all the three sizes of quartz have been effectively removed, the content of SiO2 decreased, and the content of Al2O3 increased and the classification effect was good. Because the yield of-10 渭 m particles after sedimentation is higher than 90%, and it only takes 19 minutes to settle at once, the Al2O3 content of the product after sedimentation is obviously increased. Therefore, the grade-10 渭 m product was used as the next step to prepare polyaluminum ferric chloride flocculant. The activation tests of purified Illite were carried out by direct calcination and alkali-assisted calcination respectively. The results showed that the fluxing method was helpful to the dissolution of Illite crystal structure and the dissolution of aluminum. The solubilization effect is in turn: sodium carbonate sodium fluoride direct calcination. Illite and sodium carbonate were mixed calcined and acid leached with hydrochloric acid. The effects of calcination activation temperature, calcination time and alkali-ore ratio, solid-liquid ratio, hydrochloric acid concentration, acid leaching time and acid leaching temperature on the leaching rate of Illite Al were investigated by single factor and orthogonal test. The results showed that the order of the main and secondary factors affecting the leaching rate of Illite Al was as follows: acid leaching time of liquid-solid specific alkali-ore ratio to HCl concentration calcination temperature acid leaching temperature calcining time; The optimum conditions for leaching rate of Al are as follows: calcination temperature 900 鈩，
本文编号：2468023
[Abstract]:In China, Illite is widely distributed, has large reserves and is of good quality. Although Illite has been successfully used in many aspects, the preparation of flocculant with Illite as raw material has not been reported. Due to the shortage of water resources and the continuous increase of the total amount of sewage in China, it is urgent to treat sewage. The research on flocculant-flocculant, which is the key link of water treatment, needs to be further strengthened. Illite belongs to high aluminous clay. Illite is used as raw material to prepare polyaluminum ferric chloride flocculant by wet deposition, which can not only give full play to its high aluminum properties, but also open up a new way of thinking for the utilization of Illite. It also found a new material for the preparation of inorganic polymer flocculant. First of all, the pulping test of Illite ore is carried out. The optimum conditions are as follows: ramming speed is 2000rpm, ramming time is 90min, dispersant dosage is 0.9%; Then the slurry was classified by natural sedimentation, and three particle grades-2 渭 m,-5 渭 m and-10 渭 m were divided into three grades:-2 渭 m,-5 渭 m and-10 渭 m, and then the chemical composition, particle size and XRD analysis of the three particles were carried out respectively. The results showed that all the three sizes of quartz have been effectively removed, the content of SiO2 decreased, and the content of Al2O3 increased and the classification effect was good. Because the yield of-10 渭 m particles after sedimentation is higher than 90%, and it only takes 19 minutes to settle at once, the Al2O3 content of the product after sedimentation is obviously increased. Therefore, the grade-10 渭 m product was used as the next step to prepare polyaluminum ferric chloride flocculant. The activation tests of purified Illite were carried out by direct calcination and alkali-assisted calcination respectively. The results showed that the fluxing method was helpful to the dissolution of Illite crystal structure and the dissolution of aluminum. The solubilization effect is in turn: sodium carbonate sodium fluoride direct calcination. Illite and sodium carbonate were mixed calcined and acid leached with hydrochloric acid. The effects of calcination activation temperature, calcination time and alkali-ore ratio, solid-liquid ratio, hydrochloric acid concentration, acid leaching time and acid leaching temperature on the leaching rate of Illite Al were investigated by single factor and orthogonal test. The results showed that the order of the main and secondary factors affecting the leaching rate of Illite Al was as follows: acid leaching time of liquid-solid specific alkali-ore ratio to HCl concentration calcination temperature acid leaching temperature calcining time; The optimum conditions for leaching rate of Al are as follows: calcination temperature 900 鈩，
本文编号：2468023
本文链接：https://www.wllwen.com/kejilunwen/kuangye/2468023.html
