【摘要】：菱鎂礦作為我國一種重要的優(yōu)勢非金屬礦產資源,其相應制品的產、出口量均位居世界首位。我國近年來在菱鎂礦資源利用上,始終處在優(yōu)質原料、二等加工、產品單一、低附加值的尷尬處境,大量優(yōu)質的資源卻被作為生產低附加值的產品的原材料,高精尖的產品較少,導致對資源價值的一種極大浪費,氧化鎂作為一種具有重要的工業(yè)價值的無機化工類產品,其用途相當廣泛,可使用在燃料、醫(yī)藥、橡膠、試劑、牲畜飼料、建筑、化肥、造紙等以及環(huán)保領域上。高純氧化鎂是一種鎂化學品且具有較高商業(yè)價值。本文針對當前我國菱鎂礦行業(yè)發(fā)展現(xiàn)狀,提出從經濟效益和可持續(xù)發(fā)展的角度,我國應在充分發(fā)揮菱鎂礦的資源優(yōu)勢基礎上,研發(fā)新型高附加值的產品,加快技術創(chuàng)新步伐。此次課題研究針對海城菱鎂礦為原材料經過焙燒、銨鹽浸出、采用氨水沉淀法制備氫氧化鎂,再經煅燒得到高純氧化鎂,并對氯化銨溶液和硫酸銨溶液浸出輕燒氧化鎂效果上做了對比。另外,對添加改變菱鎂礦輕燒粉表面親水性藥劑對浸出效果的影響進行了研究。實驗過程中重點研究其制備過程中主要影響因素,確定了利用銨鹽浸出海城菱鎂礦最佳制備條件:菱鎂礦最適宜焙燒粒度為-2mm,最佳溫度為800℃,最適宜的焙燒時間為40min,通過氯化銨與硫酸銨浸出條件及效果對比,確定用氯化銨作為輕燒氧化鎂浸出劑且最佳浸出條件為4g輕燒粉對應2.5mol/L氯化銨溶液用量為150mL(氧化鎂與氯化銨反應摩爾比約為1:3.75),反應時間為1h,浸出溫度為60℃,攪拌速度400r/min為最佳。改變親水性對輕燒氧化鎂浸出率的影響實驗當中,研究表明水玻璃、六偏磷酸鈉、羧甲基纖維素鈉、EDTA四鈉四種藥劑對浸出過程有不同程度的作用。氨水作為沉淀劑與輕燒氧化鎂浸出液反應制備氫氧化鎂的實驗當中,與輕燒氧化鎂浸出液最佳沉淀反應時間為60min、氨水濃度為8mol/L、反應溫度為45℃,以及最佳攪拌速度為500r/min。制得氫氧化鎂的最佳焙燒溫度為500℃,最佳焙燒時間為30min。在上述實驗條件下可制得產品MgO含量為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，

本文編號：2408917