Dec 18, 2013 Energy Use in Comminution. Grinding activities in general (including coarse, intermediate, and fine grinding) account for 0.5 pct of U.S. primary energy use, 3.8 pct of total U.S. electricity consumption, and 40 pct of total U.S. mining industry energy use. Large energy saving opportunities have been identified in grinding in particular.
In general, Bond's work index is used to determine the grinding efficiency and also to calculate the power requirement. The process is very time consuming and it requires skilled labor and specialized mill. A systematic investigation was carried out to predict Bond's work index using simple field measurable properties of rocks.
Aug 01, 2005 The Bond work index is one of the most useful and interesting parameters used in designing grinding equipment. However, it must be obtained under restrained conditions, especially in regards to the Bond standard lab mill. The main objective of this study is to show how this index can be obtained using a Denver ball mill, which is present in most mineral processing laboratories. The.
It is always attempted to reduce the costs of comminution in mineral processing plants. One of thedifficulties in size reduction section is not to be designed properly. The key factor to design size reductionunits such as crushers and grinding mills, is ore’s work index. The work index, wi, presents the oregrindability, and is used in Bond formula to calculate the required energy.
For mineral processing project, after blasting, crushing and screening system is always the first stage to reduce the big raw ore lumps to proper small particle size for following mill grinding system. Normally to reduce the big ore lumps to small particles, two to three stages crushing is required.
Besides, the results of work index tests are accordingly implemented in Equation 5 to calculate the ore work index values. Equation 5 is similar to Bond work index equation, but it has been defined for the foregoing calibrated bond ball mill . P F P G Wi i i 10 10 11.76 1 1 230. 75 u u (5) Where, W i =Bond laboratory ball work index.
Bond index is useful in designing of grinding system in mineral processing. In this study, the Bond work index of Birnin- Gwari iron ore in northern Nigeria is determined using modified Bond’s method using ‘reference ore’. Samples of iron ore were sourced using random method, reference minerals marble and granite of known weight and iron ore of known weight were ground using the.
Knowing the average Hardgrove index, a calculated work index of 12.88 kW STPH was estimated using Aplan’s empirical formula. This average work index was less comparable to those of feldspar ores given in the literature. Therefore, the method of Berry and Bruce was used to determine the specific energy and approximate work index.
The granite as a reference material with work index of 15.13kwh short ton was used to calculate the work index of the test material which was found to be 12.73kwh short ton, being the energy required to comminute one tone of the ore. KEYWORDS Bond's index, Arufu Lead Ore, modified, reference mineral, mineral processing ----- ----- Date of.
Determine the suitability of a mineral for processing in an autogenous mill. Suitable minerals such as copper or iron ore are listed in table 4. This type of mill has the distinct advantage of accepting coarse feedstock and supplying a relatively fine finished product, often sufficient as an end product.
Apr 08, 2019 The higher the Bond Work Index, the difficult it is to grind the material. This procedure is important to mineral processing industries as it helps to determine the proper equipment necessary for grinding by estimating the power and energy needed to achieve desired grinding results.
By Mark Cooksey. How falling ore grades and increasing ore complexity are making metallurgical testwork challenging. When identifying new deposits and planning for plant construction, metallurgical testing is vital to determine mineralogy and process flowsheets, so that extraction and processing can be achieved economically at commercial scale.
Feb 25, 2015 Mineral Coal Processing is the subsequent step after mining of Mineral Coal. The first step of Mineral Processing is the Crushing of minerals. This presentation is about crushing of coal and how to calculate the crushing efficiency of coal from processing point of view.