本文選題：黃鐵礦　切入點(diǎn)：重介質(zhì)旋流器　出處：《武漢科技大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：針對磁鐵礦精礦的精選和黃鐵礦的分選，本論文設(shè)計(jì)了一種底流型磁力旋流器，并通過模擬和計(jì)算對這種底流型磁力旋流器的磁力系統(tǒng)進(jìn)行了分析，結(jié)果表明：這種磁力系統(tǒng)在豎直方向的磁感應(yīng)強(qiáng)度分量平行于旋流器軸線，并指向線圈中心，，水平方向磁感應(yīng)強(qiáng)度分量指向旋流器壁。該磁力系統(tǒng)主要有兩個(gè)作用，其一，在磁感應(yīng)強(qiáng)度較大時(shí)，可以牽引磁鐵礦進(jìn)入沉砂，從而增大沉砂中磁鐵礦的回收率；其二，磁感應(yīng)強(qiáng)度較小時(shí)，可以增加旋流器錐體下部礦漿密度，形成一個(gè)較高密度層，同時(shí)還可以提高旋流器內(nèi)旋流與外旋流之間過渡層的密度，最終達(dá)到分選礦物的目的。 磁鐵礦精礦精選的試驗(yàn)表明，磁鐵礦原礦品位為66.0%，經(jīng)過底流型磁力旋流器精選后，磁鐵礦精礦品位提高了1.5個(gè)百分點(diǎn)，此時(shí)電流為0.3A，回收率為84.00%。這說明調(diào)節(jié)底流型磁力旋流器的磁感應(yīng)強(qiáng)度可以精選磁鐵礦精礦；這部分試驗(yàn)還表明，當(dāng)使用磁鐵礦粉作為重介質(zhì)旋流器重介質(zhì)時(shí)，若磁力系統(tǒng)位于旋流器錐體底部時(shí)，則最適合分選礦物。 最后進(jìn)行了磁力重介質(zhì)旋流器分選黃鐵礦的試驗(yàn)，試驗(yàn)首先找到一個(gè)合適的重介質(zhì)旋流器的分選條件，然后在這個(gè)合適條件下加入磁場。實(shí)驗(yàn)結(jié)果表明：重介質(zhì)旋流器分選黃鐵礦的效果明顯優(yōu)于普通型旋流器，在原礦品位為29.27%的條件下，后者的精礦品位為35.50%，前者精礦品位為39.30%，重介質(zhì)旋流器最佳分選條件如下：磁鐵礦粉粒度為-37μm占83.4%，沉砂嘴直徑為12mm，給礦壓力為0.1MPa。 磁力重介質(zhì)旋流器的試驗(yàn)表明當(dāng)電流為0.3A，磁感應(yīng)強(qiáng)度為8×10-3T時(shí)，分選效果最好，硫品位可以提高到42.4%，當(dāng)沉砂濃度較高時(shí)只提高底流濃度不利于分選。
[Abstract]:Aiming at the separation of magnetite concentrate and pyrite, a kind of bottom flow type magnetic cyclone is designed in this paper, and the magnetic system of this kind of bottom flow type magnetic cyclone is analyzed by simulation and calculation. The results show that the magnetic induction intensity component in the vertical direction is parallel to the axis of the cyclone and points to the center of the coil, and the magnetic induction intensity component in the horizontal direction points to the wall of the cyclone. When the magnetic induction intensity is high, the magnetite can be towed into the settling sand, thus increasing the recovery rate of the magnetite in the settling sand. Secondly, when the magnetic induction intensity is small, the slurry density in the lower cone of the cyclone can be increased and a higher density layer can be formed. At the same time, the density of the transition layer between the swirl and the outer swirl in the cyclone can be increased, and finally the mineral separation can be achieved. The test of magnetite concentrate cleaning shows that the grade of magnetite concentrate is 66.0%, and the grade of magnetite concentrate has been improved by 1.5% after the bottom flow type magnetic cyclone cleaning. The current is 0.3 A and the recovery rate is 84.00. This indicates that the magnetic induction intensity of the bottom flow type magnetic cyclone can be purified from the magnetite concentrate. The experiments also show that when the magnetite powder is used as the heavy medium of the heavy medium cyclone, If the magnetic system is located at the bottom of the cyclone cone, it is most suitable for mineral separation. Finally, the experiment of separating pyrite with magnetic heavy medium cyclone is carried out. First, a suitable separation condition of heavy medium cyclone is found. The experimental results show that the separation effect of heavy medium cyclone for pyrite is better than that for ordinary type cyclone, and when the grade of raw ore is 29.27%, The concentrate grade of the latter is 35.50, the former is 39.30, the optimum separation conditions of heavy medium cyclone are as follows: the granularity of magnetite powder is -37 渭 m, the diameter of sand mouth is 12mm, and the pressure of ore feeding is 0.1 MPA. The test of magnetic heavy medium cyclone shows that when the current is 0.3A and the magnetic induction intensity is 8 脳 10 ~ (-3) T, the separation effect is the best, the sulfur grade can be raised to 42.4%, and when the sand concentration is high, it is not good to increase the bottom flow concentration.
【學(xué)位授予單位】：武漢科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD951

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本文編號：1591581