product news/產品新聞
in the in-house system was paid back in 1.5 years. Pistones Moresa implemented the in-house chip melting
process in a joint effort with SIA Automation, Aguascali- entes, Mexico, and Molten Metal Equipment Innovations, Middlefield, Ohio, USA. Te project integrated various individual pieces of equipment grouped into four clusters: 1. Chip pre-treatment. 2. Chip submergence system. 3. Melting furnace. 4. Alloying furnace. Te system was designed to melt chips at a rate of 500 kg/
hour. Te chip pre-treatment system consists of seven basic components: collection hopper, three conveyors, solids separator, centrifugal dryer, magnetic separator, drying oven and charging scale. Te chip submergence system consists of a mixer and a re- circulation pump. Te pump draws hot metal from the furnace’s holding chamber directly into the mixer well to increase the melt rate of the chips being submerged in the mixer. A launder system transfers metal from the chip-melting furnace to the central alloying tilting-furnace. Detailed evaluation of the chip melting process showed
the chips coming from the machining operation contain between 12 and 15% moisture; the drain system in the col- lection hopper removes about 8% of the moisture, leaving chips with 4 to 7% moisture. Te centrifugal unit then may subtract up to 5% of moisture for a total moisture percent- age less than 2. Te drying oven further reduces moisture content to less than 0.3%. During the optimization of the melting practices and
process parameters to configure the in-house chip melting system, Pistones Moresa established and documented that for every 4,000 kg of dry chips that were charged, between 80 and 120 kg of dross was generated. Using a mass bal- ance formula where metal input (dry chips) equals metal output (aluminum transferred to alloying furnaces) plus oxidized metal output (dross), the metalcaster determined its recovery rate was between 97 and 98%, for a 2 to 3% metal loss. ■ Tis article was adapted from the AFS Proceedings paper (11-098) “Improving Competitiveness Trough In-House
Aluminum Chip Melting: A Case Study.” Visit
www.mmei-inc.com for more information.
Aguascalientes市的SIA Automation公司以及位于 美国俄亥俄州Middlefield市的Molten Metal Equip- ment Innovations公司合作完成的。该项目集成了各 种单个设备，主要分成四大部分： 切屑预热
切屑浸入系统 熔化炉 合金化炉
该系统的切屑速度融化为1,102磅/小时（500公斤/ 小时）。切屑的前处理系统有7个基本组成部分：收集 料斗、三个输送带、固体分离器、离心干燥机、磁选 机、烘干炉和加料称。切屑浸入系统包括一个混合器和 一个循环泵。泵将熔炉保温室的熔融金属直接吸入搅拌 机，这提高了搅拌机中浸入切屑的熔化效率。流槽把熔 体从熔炉直接送到中央合金化炉。
对切屑熔化过程的详细评估表明来自加工的切屑包含 12%至15％水分；收集料斗的排水系统除掉了约8％的 水分，留下4％至7％水分。离心单元进一步去除5％的 水分，总含水率小于2%。烘箱进一步将水分降至0.3％ 以下。
在优化封闭室内切屑熔炼系统的熔炼和工艺参数
时，Pistones Moresa公司每回收8,800磅（4,000公 斤）切屑就记录一次，每次产生的渣子在176~264磅之 间。根据质量守恒公式，金属输入（干切屑）等于输出 金属（铝合金炉）加氧化的渣子产量，铸造人员确定出
回收率在97%和98％之间，损失为2％至3％。■ 本文选自AFS会议论文(11-098)“案例：通过封闭室
内铝屑熔炼系统增强竞争力”。 如果您要了解更多，请登录
www.mmei-inc.com。
The side view of the furnace wells at Pistones Moresa shows the position of the cleaning well (A), mixer (B), recirculation pump (C) and submerged openings (D).
Pistones Moresa公司熔 炉炉腔侧视图展示了清 洗腔(A)，搅拌器 (B)，再 循环泵 (C) 和淹没的开口 (D)的位置。
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FOUNDRY-PLANET.COM | MODERN CASTING | CHINA FOUNDRY ASSOCIATION Spring 2012
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