利用海城菱镁矿制备高纯氧化镁研究
发布时间：2019-01-14 17:15
【摘要】：菱镁矿作为我国一种重要的优势非金属矿产资源,其相应制品的产、出口量均位居世界首位。我国近年来在菱镁矿资源利用上,始终处在优质原料、二等加工、产品单一、低附加值的尴尬处境,大量优质的资源却被作为生产低附加值的产品的原材料,高精尖的产品较少,导致对资源价值的一种极大浪费,氧化镁作为一种具有重要的工业价值的无机化工类产品,其用途相当广泛,可使用在燃料、医药、橡胶、试剂、牲畜饲料、建筑、化肥、造纸等以及环保领域上。高纯氧化镁是一种镁化学品且具有较高商业价值。本文针对当前我国菱镁矿行业发展现状,提出从经济效益和可持续发展的角度,我国应在充分发挥菱镁矿的资源优势基础上,研发新型高附加值的产品,加快技术创新步伐。此次课题研究针对海城菱镁矿为原材料经过焙烧、铵盐浸出、采用氨水沉淀法制备氢氧化镁,再经煅烧得到高纯氧化镁,并对氯化铵溶液和硫酸铵溶液浸出轻烧氧化镁效果上做了对比。另外,对添加改变菱镁矿轻烧粉表面亲水性药剂对浸出效果的影响进行了研究。实验过程中重点研究其制备过程中主要影响因素,确定了利用铵盐浸出海城菱镁矿最佳制备条件:菱镁矿最适宜焙烧粒度为-2mm,最佳温度为800℃,最适宜的焙烧时间为40min,通过氯化铵与硫酸铵浸出条件及效果对比,确定用氯化铵作为轻烧氧化镁浸出剂且最佳浸出条件为4g轻烧粉对应2.5mol/L氯化铵溶液用量为150mL(氧化镁与氯化铵反应摩尔比约为1:3.75),反应时间为1h,浸出温度为60℃,搅拌速度400r/min为最佳。改变亲水性对轻烧氧化镁浸出率的影响实验当中,研究表明水玻璃、六偏磷酸钠、羧甲基纤维素钠、EDTA四钠四种药剂对浸出过程有不同程度的作用。氨水作为沉淀剂与轻烧氧化镁浸出液反应制备氢氧化镁的实验当中,与轻烧氧化镁浸出液最佳沉淀反应时间为60min、氨水浓度为8mol/L、反应温度为45℃,以及最佳搅拌速度为500r/min。制得氢氧化镁的最佳焙烧温度为500℃,最佳焙烧时间为30min。在上述实验条件下可制得产品MgO含量为99.84%。
[Abstract]:Magnesite is an important non-metallic mineral resource in China. The output and export of magnesite are the first in the world. In recent years, the utilization of magnesite resources in China has always been in the awkward situation of high quality raw materials, second class processing, single products and low added value. However, a large number of high-quality resources have been used as raw materials for the production of low added value products. As a kind of inorganic chemical products with important industrial value, magnesium oxide is widely used in fuel, medicine, rubber, reagent, etc. Livestock feed, construction, fertilizer, paper making and environmental protection. High purity magnesium oxide is a magnesium chemical with high commercial value. In view of the present development situation of magnesite industry in China, this paper puts forward that, from the angle of economic benefit and sustainable development, our country should develop new products with high added value on the basis of giving full play to the resource advantages of magnesite, and speed up the pace of technological innovation. In this study, magnesium hydroxide was prepared by ammonia precipitation method after calcination and leaching of ammonium salt as raw material of Haicheng magnesite, and then calcined to obtain high purity magnesium oxide. The effects of ammonium chloride solution and ammonium sulfate solution on the leaching of light burned magnesium oxide were compared. In addition, the effect of adding hydrophilic agent on the surface of magnesite light burning powder on leaching effect was studied. In the course of the experiment, the main factors affecting the preparation of magnesite were studied, and the optimum preparation conditions were determined: the optimum calcination size of magnesite was -2mm, the optimum temperature was 800 鈩，
本文编号：2408917
[Abstract]:Magnesite is an important non-metallic mineral resource in China. The output and export of magnesite are the first in the world. In recent years, the utilization of magnesite resources in China has always been in the awkward situation of high quality raw materials, second class processing, single products and low added value. However, a large number of high-quality resources have been used as raw materials for the production of low added value products. As a kind of inorganic chemical products with important industrial value, magnesium oxide is widely used in fuel, medicine, rubber, reagent, etc. Livestock feed, construction, fertilizer, paper making and environmental protection. High purity magnesium oxide is a magnesium chemical with high commercial value. In view of the present development situation of magnesite industry in China, this paper puts forward that, from the angle of economic benefit and sustainable development, our country should develop new products with high added value on the basis of giving full play to the resource advantages of magnesite, and speed up the pace of technological innovation. In this study, magnesium hydroxide was prepared by ammonia precipitation method after calcination and leaching of ammonium salt as raw material of Haicheng magnesite, and then calcined to obtain high purity magnesium oxide. The effects of ammonium chloride solution and ammonium sulfate solution on the leaching of light burned magnesium oxide were compared. In addition, the effect of adding hydrophilic agent on the surface of magnesite light burning powder on leaching effect was studied. In the course of the experiment, the main factors affecting the preparation of magnesite were studied, and the optimum preparation conditions were determined: the optimum calcination size of magnesite was -2mm, the optimum temperature was 800 鈩，
本文编号：2408917
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