本文選題：菱鎂礦　切入點：浮選　出處：《遼寧科技大學(xué)》2017年碩士論文

【摘要】：我國菱鎂礦資源豐富,其儲量、進出口量均居世界首位,是我國優(yōu)勢礦產(chǎn)資源之一,因耐火性、粘結(jié)性較高以及特有的物理化學(xué)性質(zhì)被廣泛用于冶金、化工、建材、輕工及金屬鎂提純等領(lǐng)域,其中冶金工業(yè)是消耗鎂制耐火材料最多的行業(yè),占耐火材料總量的70%。但隨著一部分優(yōu)質(zhì)菱鎂礦礦山的不規(guī)則開采,造成采富棄貧現(xiàn)象,遭到破壞,資源浪費嚴重,開發(fā)利用低品位菱鎂礦資源變得極為關(guān)鍵。近年來大量學(xué)者針對低品級菱鎂礦進行提純研究,浮選法作為最常用的菱鎂礦選礦方法,浮選藥劑的研究較為重要。菱鎂礦中主要雜質(zhì)為硅酸鹽和碳酸鹽兩大類,針對菱鎂礦性質(zhì),對捕收劑和調(diào)整劑的研發(fā)較多,而且適量調(diào)整劑的加入能更好的配合捕收劑更有效的對將菱鎂礦和脈石礦物分離,從而達到工業(yè)上設(shè)備、人工和藥劑成本的最低化。本課題針對海城菱鎂礦石性質(zhì),通過對調(diào)整劑種類及用量的考察對比,以純礦物結(jié)合實際礦進行浮選試驗研究,尋求更好的菱鎂礦除雜提純工藝。分別在醚胺和油酸鈉兩種捕收劑體系下考察了p H值、調(diào)整劑和捕收劑種類及用量對純礦物菱鎂礦、白云石和石英的可浮性影響,并根據(jù)試驗結(jié)果進行了菱鎂礦實際礦石的試驗研究。試驗結(jié)果證明五種調(diào)整劑六偏磷酸鈉、水玻璃、磷酸三鈉、單寧酸和草酸銨中,六偏磷酸鈉在反浮選中單獨作用效果較好,而正浮選中混合使用六偏磷酸鈉和水玻璃能根號的對礦物進行分離。最終確定通過反-正浮選聯(lián)合工藝流程,磨礦細度-0.074mm含量85%,反浮選p H=5.0,醚胺用量150g·t-1,單獨使用六偏磷酸用量150g·t-1,采用一粗兩精流程;正浮選p H=10.0,油酸鈉用量250g·t-1,六偏磷酸鈉和水玻璃混合使用(200g·t-1、2000g·t-1),可獲得精礦Mg O含量47.35%;Si O2品位0.12%,Ca O品位0.6%,精礦產(chǎn)率為74.66%。可達到本課題預(yù)期浮選效果。
[Abstract]:China is rich in magnesite resources, its reserves, imports and exports are the first in the world. It is one of the superior mineral resources in China. It is widely used in metallurgy, chemical industry and building materials because of its refractory, high adhesion and unique physical and chemical properties.Metallurgical industry is the most consuming field of magnesium refractories, accounting for 70% of total refractories.However, with the irregular mining of some high quality magnesite mines, the phenomenon of rich and poor mining is destroyed, and the waste of resources is serious, so the exploitation and utilization of low-grade magnesite resources becomes extremely critical.In recent years, a large number of scholars have studied the purification of low-grade magnesite. Flotation, as the most commonly used magnesite processing method, is more important in the study of flotation reagents.The main impurity in magnesite is silicate and carbonate. In view of magnesite properties, there are many research and development of collector and adjuster.And the addition of proper amount of adjuvant can better cooperate with collector to separate magnesite and gangue mineral more effectively, so as to achieve the lowest cost of equipment, labor and medicament in industry.According to the properties of magnesite in Haicheng, through the investigation and comparison of the types and dosage of the adjuster, the flotation experiment of pure mineral combined with real ore is carried out to find a better process for removing impurities and purifying magnesite.The effects of pH value, type and amount of adjuster and collector on the floatability of pure mineral magnesite, dolomite and quartz were investigated in the system of etheramine and sodium oleate, respectively.Based on the experimental results, the actual ore of magnesite is studied.The results show that sodium hexametaphosphate, sodium silicate, trisodium phosphate, tannic acid and ammonium oxalate have better effect in reverse flotation.The mineral was separated by the mixture of sodium hexametaphosphate and sodium silicate in positive flotation.Finally, through the combined reverse-positive flotation process, grinding fineness-0.074 mm content 85 mm, reverse flotation pH 5.0, ether amine dosage 150 g t-1, single use of hexomethenic phosphoric acid 150 g t-1, using a coarse two refined process;Positive flotation of pH 10.0, sodium oleate dosage of 250g t-1, sodium hexametaphosphate and sodium hexametaphosphate mixed with sodium hexametaphosphate 200g t-1n 2000g t-1a can obtain the content of mg O in concentrate 47.35% and 0.12% Sio 2 grade 0.12% Ca O 2, and the concentrate yield is 74.66.The expected flotation effect can be achieved.
【學(xué)位授予單位】：遼寧科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TD923;TD97

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