本文選題：工藝礦物學 + 常規(guī)選礦��； 參考：《昆明理工大學》2015年碩士論文

【摘要】：鮞狀赤鐵礦目前尚屬難選礦石,主要表現(xiàn)在生產工藝復雜,鐵精礦品位很難達到冶煉要求,且生產成本高,因此到現(xiàn)在基本上還沒有廠家對其開發(fā)利用。但隨著鐵礦石資源的短缺,加上各自礦山服務年限越來越少,目前國內各個礦山都紛紛占有資源,組織各科研院所對鮞狀赤鐵礦的可選性作了大量的研究。本論文對寧南華彈鮞狀赤鐵礦進行了化學多元素分析、物相分析、粒度組成等工藝礦物學研究,結果表明,區(qū)內礦石屬低磷、低硫的單一半自熔性寧鄉(xiāng)式鮞狀赤鐵礦礦石。礦石中鐵的賦存狀態(tài)較為簡單,以高價氧化鐵的形式分布在赤(褐)鐵礦中的鐵高達96.07%嵌布粒度統(tǒng)計結果顯示,礦石中赤鐵礦鮞粒具中粗粒嵌布的特點。如果將赤鐵礦鮞粒作為選礦的基本單元,那么在-0.59mm的磨礦細度條件下,95%左右的赤鐵礦鮞粒均可呈單體產出。礦石經還原焙燒后,大部分赤鐵礦已轉化為磁鐵礦,但其集合體仍保留了原礦石中赤鐵礦鮞粒的基本特征,磁鐵礦與脈石礦物仍然多呈環(huán)帶狀相間排列,而且在部分礦粒中尚見形態(tài)各異的赤鐵礦呈交代殘余零星分布。在工藝礦物學研究的基礎上,本論文對寧南華彈鮞狀赤鐵礦進行了選礦試驗研究。探索性試驗采用了常規(guī)選礦試驗,結果表明,原礦直接采用強磁選、強磁選-反浮選等機械物料選礦流程難以得到TFe57%以上的鐵精礦。為此進一步采用焙燒-磁選等化學選礦方法進行研究,最終結果表明焙燒-磁選-反浮選全流程試驗方案可行。并對產品進行了產品檢查,產品沉降過濾試驗,尾礦廢水水質分析。結合該礦石的性質、類型、特點,在工藝礦物學研究的基礎上,通過多方案比較和各種工藝參數(shù)詳細的條件試驗,推薦原礦采用還原磁化焙燒—弱磁選—陰離子反浮選流程作為該鮞狀赤鐵礦選礦的原則流程,在還原氣氛(外加本地2#煤10%)條件下,控制焙燒溫度750℃左右,焙燒時間不低于90min(焙燒時間越長,磁化率越高,焙燒效果越好,鐵精礦回收率相應越高),水冷出爐,可以獲得比較優(yōu)質的磁化焙燒礦,在焙燒礦磨礦細度-0.043mm(-325目)粒級含量占91.26%的條件下,原礦采用還原磁化焙燒-弱磁選(磁場強度1200 Oe)流程,可得產率61.54%、品位TFe55.52%、回收率80.94%的弱磁精礦；在弱磁精礦磨礦細度-0.043mm粒級含量占90.07%的條件下,原礦采用還原磁化焙燒-弱磁選(磁場強度2000 Oe)-陰離子反浮選流程,可得鐵精礦產率60.64%、品位TFe57.22%、回收率82.20%,鐵精礦品位、回收率均比較高,方案可行。
[Abstract]:Oolitic hematite is still a refractory ore at present, which is mainly manifested in the complex production process, the iron concentrate grade is difficult to meet the smelting requirements, and the production cost is high.However, with the shortage of iron ore resources and the shortage of mine service life, each mine in China occupies resources one after another at present, and many research institutes have been organized to study the selectivity of oolitic hematite ore.In this paper, the chemical multielement analysis, phase analysis and granularity composition of the oolitic hematite were studied. The results show that the ore in the area is a single semi-self-fluxing Ningxiang oolitic hematite with low phosphorus and low sulfur.The occurrence state of iron in ore is relatively simple. The distribution of iron in red (brown) iron ore in the form of high valence iron oxide is as high as 96.07% of the inlay granularity. The statistical results show that the hematite oolitic particles in the ore have the characteristics of medium and coarse grain intercalation.If hematite oolitic particles are taken as the basic unit of ore dressing, 95% hematite oolitic particles can be produced as monomers under the grinding fineness of -0.59 mm.After the reduction roasting, most hematite has been transformed into magnetite, but its aggregates still retain the basic characteristics of hematite oolitic particles in the original ore, and the magnetite and gangue minerals are still arranged in annular bands.In addition, hematite with different shapes is distributed sporadically in some ore grains.On the basis of technological mineralogy research, this paper has carried on the ore dressing experiment research to the Ningnan Hua slug oolitic hematite.The results show that it is difficult to obtain more than 57% iron concentrate from raw ore by means of high magnetic separation and high magnetic separation and reverse flotation.For this reason, the roasting magnetic separation and other chemical dressing methods are adopted to further study, and the final results show that the whole process test scheme of roasting magnetic separation and reverse flotation is feasible.Product inspection, product sedimentation and filtration test, tailings waste water quality analysis were also carried out.Combined with the properties, types and characteristics of the ore, on the basis of the study of process mineralogy, through the comparison of various schemes and detailed conditional tests of various technological parameters,It is recommended that the process of reduction magnetization roasting, weak magnetic separation and anion reverse flotation should be used as the principle process of this oolitic hematite dressing. Under the condition of reducing atmosphere (plus local coal 10), the calcination temperature is controlled at 750 鈩，

本文編號：1733389