Ball mill/SAG mill drive lubrication system

2015 ◽  
Author(s):  
Jeffrey M. Kutz ◽  
Ashok B. Amin
Keyword(s):  
Ball Mill ◽  
Lubrication System ◽  
Sag Mill

Simulation-Assisted Evaluation of Grinding Circuit Flowsheet Design Alternatives: Aghdarreh Gold Ore Processing Plant / Ocena Alternatywnych Schematów Technologicznych Procesu Rozdrabniania W Zakładach Przeróbki Rud Złota W Aghdarreh, Z Wykorzystaniem Metod Symulacji

2015 ◽  
Vol 60 (1) ◽  
pp. 123-141
Author(s):  
A. Farzanegan ◽  
A. Ebtedaei Ghalaei
Keyword(s):  
Particle Size ◽  
Ball Mill ◽  
Single Stage ◽  
Closed Circuit ◽  
Balance Model ◽  
Distribution Data ◽  
Processing Plant ◽  
Data Sets ◽  
Gold Extraction ◽  
Sag Mill

Abstract The run of mine ore from Aghdarreh gold mine must be comminuted to achieve the desired degree of liberation of gold particles. Currently, comminution circuits include a single-stage crushing using a jaw crusher and a single-stage grinding using a Semi-Autogenous Grinding (SAG) mill in closed circuit with a hydrocyclone package. The gold extraction is done by leaching process using cyanidation method through a series of stirred tanks. In this research, an optimization study of Aghdarreh plant grinding circuit performance was done to lower the product particle size (P80) from 70 μm to approximately 40 μm by maintaining current throughput using modeling and simulation approach. After two sampling campaigns from grinding circuit, particle size distribution data were balanced using NorBal software. The first and second data sets obtained from the two sampling campaigns were used to calibrate necessary models and validate them prior to performing simulation trials using MODSIM software. Computer simulations were performed to assess performance of two proposed new circuit flowsheets. The first proposed flowsheet consists of existing SAG mill circuit and a new proposed ball mill in closed circuit with a new second hydrocyclone package. The second proposed flowsheet consists of existing SAG mill circuit followed by a new proposed ball mill in closed circuit with the existing hydrocyclone package. In all simulations, SAGT, CYCL and MILL models were selected to simulate SAG mill, Hydrocyclone packages and ball mill units. SAGT and MILL models both are based on population balance model of grinding process. CYCL model is based on Plitt’s empirical model of classification process in hydrocyclone units. It was shown that P80 can be reduced to about 40 μm and 42 μm for the first and second proposed circuits, respectively. Based on capital and operational costs, it can be concluded that the second proposed circuit is a more suitable option for plant grinding flowsheet modification.

DESAIN ELASTOHYDRODINAMIS LUBRICATION SYSTEM DENGAN PENGATUR TEKANAN PADA CAMSHAFT MOTOR BENSIN 4 LANGKAH

2017 ◽  
Vol 8 (2) ◽  
pp. 773
Author(s):  
Nana Supriyana ◽  
Mastur Mastur
Keyword(s):  
Lubrication System

Camshaft didesain dengan beberapa pertimbangan seperti durasi bukaan katup, tinggi angkat katup, jarak titik puncak antara cam lobe intake  dan cam lobe exhaust, dengan cara kerja berputar, tertekan dan bergesekan akan menimbulkan hal yang tidak bisa dihindarkan yaitu terjadinya proses keausan permukaan yang bergesekan yang berdampak perubahan pada waktu pemasukan campuran bahan bakar dengan udara dan pengeluaran sisa pembakaran yang pada akhirnya berpengaruh terhadap kemampuan kerja motor secara keseluruhan. Penelitian ini dilakukan untuk mengamati fenomena keausan yang terjadi pada komponen camshaft dengan cara membuat desain sistem pelumasan (elastohydrodinamic lubrication system) untuk mencapai kondisi elastohidrodinamis selalu terjadi walaupun diawal bergeraknya komponen camshaft pada motor bensin sehingga keausan permukaan camshaft dapat diminimalisir dan kemampuan kerja motor tetap terjaga. Metode penelitian menggunakan media motor bensin 4 langkah dengan mekanisme katup jenis single over head camshaft (SOHC), kecepatan putar camshaft 2000 Rpm, temperatur kerja 78o C serta menggunakan minyak pelumas SAE 10W-40. Hasil penelitian didapatkan bahwa sistem pelumasan modifikasi dengan penambahan dua buah katup pengatur minyak pelumas pada komponen camshaft menunjukan kekasaran intake cam lobe sebesar 0,316µm dan kekasaran exhaust cam lobe sebesar 0,343µm mempunyai nilai kekasaran lebih rendah dibandingkan dengan sistem pelumasan standar menghasilkan nilai kekasaran sebesar 0,639µm untuk intake cam lobe dan 0,433µm untuk exhaust cam lobe. Hal ini membuktikan bahwa dengan modifikasi desain dengan penambahan sebuah katup pengatur minyak pelumas dapat meminimalisir atau mengurangi resiko keausan camshaft.

Choice and Exchange of Lubricating Oil for Injection Molding Machine

2019 ◽  
Vol 12 (4) ◽  
pp. 378-382
Author(s):  
Shan Syedhidayat ◽  
Quan Wang ◽  
Al-Hadad M.A.A. Mohsen ◽  
Jinrong Wang
Keyword(s):  
Injection Molding ◽  
Dimensional Accuracy ◽  
Low Noise ◽  
Working Environment ◽  
Lubricating Oil ◽  
Lubrication System ◽  
Molding Machine ◽  
Oil And Grease ◽  
Injection Molding Machine ◽  
The Stability

Background: One of the most common manufacturing equipment for polymer product is injection molding machine. In order to ensure the precise, stable and continuous operation of the injection molding machine, the maintenance of the lubrication system must be done well. The stability, reliability, rationality and low noise performance of the lubrication system of injection molding machine directly affect the quality of injection products, dimensional accuracy, molding cycle, working environment and maintenance. Objective: The purpose of this study is to introduce the methods of choice, maintenance of lubricating oil for injection molding machine from many literatures and patents in the recent years, such as lubricating oil device, lubricating composite and structure. Methods: An example of the 260M5 automatic injection molding machine is introduced for the inspection and maintenance of the lubrication system including lubricating oil and lubricating grease. Results: To ensure the lubrication of the injection molding machine, it needs to strictly observe the lubrication time and modulus of the injection molding machine. It needs to strictly control the temperature rise of the lubricating oil and select the correct lubricating oil and grease to ensure the lubrication quality. Conclusion: In the operation of the injection molding machine, it is necessary to check that the lubricating oil is sufficient and the lubricating points are working properly. It ensures sufficient lubrication of the injection molding machine and strictly observes the lubrication time and modulus of the injection molding machine. The stored lubricating oil should be sealed well to prevent air pollution.

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