摘 要
孟家沟铁矿选矿厂年处理量为40万吨原矿，给矿粒度为300～0mm，选厂设计为一次性平地建厂。
孟家沟铁矿主要矿物为磁铁矿，磁铁矿占36.5%左右，采用单一磁选工艺，磁铁矿粒度为0.1毫米左右，选用阶段磨矿,阶段选别流程。原矿品位为21.96%。矿石经第一段磨矿分级溢流进入第一段磁选，磁选产品品位为51.00%，产率为33.59%，回收率为78.00%；粗选产品再经过浓缩磁选，产品品位为53.90%，产率为60.62%，回收率为148.80%；然后磁选产品再进入第二段磨矿，之后对细粒磁铁矿进行第二段磁选；磁选产品品位为57.7%，产率为55.33%，回收率为144.90%；第二段磁选产品再经细筛，精矿品位可达62.1%，产率为25.81%，回收率为73.00%，筛下产品经过第三段磁选，磁选产品品位为63.4%，产率为25.00%，回收率为72.2%；第三段磁选产品再经第四段磁选，精矿品位可达64.8%，回收率为24.47%，产率为72.2%；最后产品再经过磁重选别，精矿品味66.5%，产率为23.11%，回收率为80%
关键词： 选矿 磁选 阶段选别 阶段磨矿
Abstract
Meng jia gou’s iron capacity for 40 million tons in ore-dressing plant of ore, Feed size for 300 ~ 0mm, The factory is designed for one-time ground.
Meng jia gou's main mineral as magnetite iron, magnetite, using a single of 36.5% magnetic separation technology
Magnetite granularity for 0.1 millimeter, choose stage
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grinding, stage for process. For 21.96% ore grade. The first section ore grinding-classification process into the first section, overflow magnetic separation products, production rate for 51.00% grade for the recovery of 78.00%; 33.59%, Through concentrated roughers.tousegravity-flotation products, product grade 53.90% for separation, yield, 148.80% 60.62% for recovery, And then again in the second period of separation products for grinding and fine after the second period of separation, develops For product grade magnetic, yield for 55.33% 57.7% and recovery of 144.90%, The second section of fine screen separation products can reach 62.1% and concentrate grade and recovery rate for 25.81%, for 73.00%, sieve under paragraph 3, the product after magnetic separation, for the product grade for 25.00% respondens yield rate, for 72.2%, The third section by section 4 of magnetic separation to concentrate grade and recovery of 64.8%, 24.47%, yield for 72.2%, Final products through heavy magnetic separation, concentrate 66.5% taste, yield for 23.11%, recovery of 80%
Key words: dressing magnetic Stage sorting Stage grinding
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目 录
摘 要............................................................. I Abstract............................................................ I 第一章 概述........................................................ 1
1.1 露天铁矿概况 ............................................... 1
1.1.1 矿区地理位置和交通情况................................ 1 1.1.2 地形 气候............................................ 1 1.2 矿石性质 ................................................... 1 1.2.1 矿石性质 .................................................. 1 1.2.2 厂址的选择 ............................................... 2 第二章 选别工艺流程................................................ 3
选别工艺的确定 .................................................. 3 第三章 破碎流程计算 ............................................... 5
3.1 新建选厂的规模 ............................................. 5
3.1.1 确定破碎车间工作制度.................................. 5 3.1.2 计算设备年作业率...................................... 5 3.1.3 计算破碎车间生产能力.................................. 5 3.2 破碎流程的选择与计算 ....................................... 5
3.2.1 确定破碎短数及各段破碎比.............................. 5 3.2.2 计算各段破碎比........................................ 6 3.2.3 计算各段产物最大粒度（mm）............................ 6 3.2.4 计算各段破碎机排矿口宽度（mm）........................ 6 3.2.5 确定筛子的筛孔尺寸和筛分效率.......................... 6 3.2.6 计算各段产物的矿量及产率.............................. 7 3.2.7 破碎数值量流程图： ................................... 7
第四章 主厂房流程计算.............................................. 8
4.1 确定主厂房工作制度及处理量 ................................. 8 4.2 选别流程数值量计算 ......................................... 8
4.2.1 确定原始数据指标数.................................... 8 4.2.2 选取原始指标.......................................... 8 4.2.3 数值量计算............................................ 9 4.2.4 验证金属量平衡....................................... 13
第五章 矿浆流程计算............................................... 14
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5.1 计算公式及原始指标的确定 .................................. 14
5.1.1 计算公式............................................. 14 5.1.2 原始指标的确定....................................... 15 5.2 矿浆流程的计算： .......................................... 15
5.2.1 矿浆中水量的计算：................................... 15 5.2.2 矿浆体积的计算：..................................... 17 5.2.3 分级作业中各阶段加水量：............................. 18 5.2.4 磨矿选别阶段矿浆流程图。............................. 21
第六章 破碎设备的选择与计算....................................... 22
6.1 粗碎设备的选择与计算 ...................................... 22
6.1.1 计算所用公式......................................... 22 6.1.2 拟定方案............................................. 22 6.2 中碎设备的选择与计算 ...................................... 23
6.2.1 计算所用公式......................................... 23 6.2.2 拟定方案............................................. 23 6.3 细碎设备的选择与计算 ...................................... 24
6.3.1 计算所用公式......................................... 24 6.3.2 拟定方案............................................. 24 6.4 筛分设备的选择 ............................................ 25
6.4.1 计算所用公式......................................... 25 6.4.2 拟定方案............................................. 25 6.5 破碎筛分设备一览表 ........................................ 26 第七章 主要设备的选择............................................. 27
7.1 磨矿机的选择 .............................................. 27
7.1.1 确定工作制度与处理量................................. 27 7.1.2 计算所用公式......................................... 27 7.1.3 一段球磨机的选择与计算............................... 28 7.1.4 二段球磨机的计算与选择............................... 29 7.2 分级机的选择 .............................................. 30
7.2.1 计算所用公式......................................... 30 7.2.2 分级机的计算与确定................................... 30 7.3 选别设备的选择 ............................................ 31
7.3.1 细筛的选择........................................... 31 7.3.2 磁选机的选择......................................... 31 7.4 过滤机的选择 .............................................. 32
7.4.1 计算所用公式......................................... 32 7.4.2 取值与计算........................................... 32 7.5 主厂房设备一览表 .......................................... 33 第八章 辅助设备和设施的计算与选择................................. 33
8.1 破碎车间辅助设施的计算与选择 .............................. 33
8.1.1 粗碎给矿机的选择..................................... 33 8.1.2 原矿矿仓的计算与选择................................. 34 8.1.3 起重设备选择......................................... 35 8.2 主厂房辅助设备选择 ........................................ 35
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8.2.1 粉矿仓的选择......................................... 35 8.2.2 粉矿仓给矿机的选择................................... 37 8.2.3 脱磁器的选择........................................ 37 8.2.4磁滑轮的选择 .......................................... 37 8.2.5起重设备选择 .......................................... 38 8.2.6 胶带的选择与计算...................................... 38 8.2.7砂泵的计算与选择 ..................................... 41
第九章 环境与安全................................................. 46
9.1 选矿厂的环境保护 .......................................... 46 9.2 选矿厂的安全 .............................................. 46 参考书目........................................................... 48 致 谢........................................... 错误！未定义书签。
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