【摘要】：磨礦分級在選礦生產(chǎn)中的重要性不言而喻。首先,磨礦分級回路的基建成本與生產(chǎn)運(yùn)營成本均占到了70%左右。其次,磨礦分級回路需要為選別作業(yè)提供粒度適宜的產(chǎn)品。因此,改善磨礦分級回路的產(chǎn)品質(zhì)量對選礦廠具有重大意義。本論文以陜西省金鉬股份百花嶺選礦廠6~#磨礦分級回路為例。該礦石主要有價(jià)金屬為鉬,以輝鉬礦形式產(chǎn)出。脈石礦物主要為石英巖和安山玢巖。流程考察結(jié)果表明,球磨排礦-74μm產(chǎn)率僅為19.17%,返砂比高達(dá)451.09%,旋流器溢流中-10μm產(chǎn)率高達(dá)18.52%,粒度組成分布極為不理想。在測定礦石的力學(xué)性質(zhì)和磨礦功指數(shù)基礎(chǔ)上,證實(shí)了礦石具有脆性,易碎難磨易過粉碎。球徑半理論公式計(jì)算結(jié)果也表明,最大球徑從120mm降至80mm較為適宜。為了考查降低球徑等磨礦工藝參數(shù)的效果,應(yīng)用JK軟件進(jìn)行了模擬。分析模擬結(jié)果發(fā)現(xiàn),單一的調(diào)整磨礦球徑等工藝參數(shù)是無法有效實(shí)現(xiàn)理想的磨礦分級指標(biāo),只有同時(shí)調(diào)整各磨礦分級工藝參數(shù)才能達(dá)到。再模擬分析發(fā)現(xiàn),最佳磨礦分級工藝參數(shù)為:球徑為80mm、磨礦濃度為80%、鋼球充填率為40%、分級濃度為60%,此時(shí)磨機(jī)排礦-74μm含量為26.21%,返砂比為297.17%,水力旋流器溢流產(chǎn)品-74μm產(chǎn)率為62.67%,其中-10μm產(chǎn)率為16.74%,比工業(yè)生產(chǎn)現(xiàn)場磨礦分級指標(biāo)改善明顯。實(shí)驗(yàn)室分別采用-2mm和-8mm樣品進(jìn)行了驗(yàn)證分析。結(jié)果發(fā)現(xiàn)當(dāng)采用-2mm樣品時(shí),實(shí)驗(yàn)室驗(yàn)證磨礦數(shù)據(jù)與最優(yōu)模擬結(jié)果相吻合。-8mm擴(kuò)大粒度驗(yàn)證試驗(yàn)?zāi)サV分級溢流產(chǎn)品-74μm高達(dá)66.26%,較流程考察溢流細(xì)度高出5.59個(gè)百分點(diǎn),獲得了比JKSimMet軟件模擬更好的細(xì)度指標(biāo)。而實(shí)驗(yàn)室溢流產(chǎn)品在提高細(xì)度的同時(shí),還大大降低了難選粒級的含量,較流程考察數(shù)據(jù)降低了2.21個(gè)百分點(diǎn)。浮選結(jié)果也證實(shí)了粒度組成的改變大大改善了浮選指標(biāo)。
[Abstract]:The importance of grinding classification in mineral processing is self-evident. First of all, the capital construction cost and production and operation cost of grinding classification loop account for about 70%. Secondly, grinding classification circuit needs to provide suitable particle size products for separation operations. Therefore, it is of great significance to improve the product quality of grinding classification circuit for concentrator. In this paper, the 6 # grinding classification circuit of Jinmo Stock Baihualing Concentrator in Shaanxi Province is taken as an example. The ore is mainly valuable metal Mo, which is produced in the form of molybdate. Gangue minerals are mainly quartz and andesite. The results show that the yield of-74 渭 m in ball milling is only 19.17%, the ratio of sand return is 451.09%, and the yield of-10 渭 m in cyclone overflow is 18.52%. The distribution of particle size composition is very poor. On the basis of measuring the mechanical properties and grinding work index of the ore, it is proved that the ore has brittleness and is fragile and difficult to grind and easy to crush. The calculation results of the semi-theoretical formula of the spherical diameter also show that it is more suitable to reduce the maximum spherical diameter from 120mm to 80mm. In order to investigate the effect of reducing ball diameter and other grinding process parameters, JK software was used to simulate the process parameters. The analysis and simulation results show that the ideal grinding classification index can not be effectively realized by adjusting the grinding ball diameter and other process parameters, and only by adjusting the grinding classification process parameters at the same time can it be achieved. The re-simulation analysis shows that the optimum grinding and classification process parameters are as follows: ball diameter 80 mm, grinding concentration 80%, ball filling rate 40%, classification concentration 60%. At this time, the content of 74 渭 m in mill is 26.21%, and the ratio of sand return to sand is 297.17%. The yield of-74 渭 m in the overflow product of hydrocyclone is 62.67%, in which the yield of-10 渭 m is 16.74%, which is obviously improved compared with the grinding classification index in the industrial production site. -2mm and-8mm samples were used for verification and analysis in the laboratory. The results show that when the-2mm sample is used, the laboratory verification grinding data are in good agreement with the optimal simulation results.-8mm expanded particle size verification test grinding grade overflow product-74 渭 m up to 66.26%. Compared with the process inspection, the overflow fineness is 5.59 percentage points higher, and the fineness index is better than that of JKSimMet software simulation. While the laboratory overflow product not only improves the fineness, but also greatly reduces the content of refractory grain size, which is 2.21 percentage points lower than the process inspection data. The flotation results also confirmed that the change of particle size composition greatly improved the flotation index.
【學(xué)位授予單位】：江西理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TD921.4

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