Chapter 6 Comminution
This chapter covers topics in relation to comminution in the minerals industry. Comminution in the pharmaceutical or chemical industries is not part of scope of this chapter. 6.1.1 Comminution Energy The process of comminution in mineral processing is dominated bythe high energy requirements of breaking rocks to liberate the valuable …
Dry comminution and liberation with microwave assistance
In the mining industry, the comminution process is very inefficient in terms of energy utilisation. Numerous research studies have investigated the use of microwave pre-treatment to fracture ore,…
Sodium Metabisulfite MBS for pH Control and Pyrite Depression …
Sodium Metabisulfite aka MBS is used for pH control in froth flotation to control Pyrite depression. Below is a graph showing pH VS pyrite recovery at various collector addition rates. It is also used to prevent flotation of sphalerite by copper activation in the presence of Tennantite/Covellite in the ore.
HIGH-PRESSURE SLURRY ABLATION FOR IMPROVING …
Disa Technologies' High-Pressure Slurry Ablation (HPSA) is a patented particle attrition technology for the comminution and selective liberation of minerals. Two slurry streams are pumped at high pressure through opposing nozzles and collisions between solid particles suspended in the slurry streams cause breakage of the feed …
Mineral liberation by high voltage pulses and conventional comminution
Comparison of the >95% liberated minerals deportment between the mechanical and electrical comminution in the 0.053−0.30 mm size range, shows that the selFrag product contains a higher amount of liberated chalcopyrite and pyrite minerals than the rod mill product. In the −0.053 mm size, the trend reverses, with higher >95% …
A process mineralogy approach to study the …
This study is conducted with the aim of investigating the efficiency of open and closed-circuit molybdenite ore comminution processes (primary and secondary mill, …
Coupling comminution indices and mineralogical features …
Coupling comminution indices and mineralogical features as an approach to a geometallurgical characterization of a copper ore. ... Pyrite, enargite, tennantite and chalcopyrite are present in binary, ... Engineering geological characterization of low strength anisotropic rocks in the Himalayan region for assessment …
Unveiling the Link between the Third Law of Comminution …
The importance of work index determinations in mineral ores comminution operations is without any doubt. The methodology proposed by F.C. Bond [] is widely used in grinding equipment design and calculations.The crucial point is that it was developed on an enormous data quantity, both at laboratory and industrial scales, yielding sound and …
Mineral Processing Mineral, renewable and secondary raw …
List of process engineering tasks for comminution and classiication » – integration of additional processes such as leaching, extraction or reactions with comminution in grinders – prediction of material adhesion in grinders and classiiers and avoidance strategies – deployment of grinding aids to alter the grinding limit and reduce the ...
Pyrite Depression in Copper Flotation
The Pyrite Depression in a Copper Only Flotation circuit is simple enough. If your froth flotation system only tries to recover chalcopyrite-copper, you need to bring the plant's pH up to the other side (right side) of the PYRITE curve. The more flotation collector you have on, the higher you will need to increase that pH for effective pyrite ...
Improving Pyrite Liberation and Grinding Efficiency …
Improving Pyrite Liberation and Grinding Efficiency in Fine Coal Comminution by Swelling Pretreatment. XIANG-HAUI WANG., QIN GUO., J. C. …
Pre-weakening of mineral ores by high voltage pulses
A new comminution method has been developed by applying high voltage pulses to pre-weaken mineral particles, leading to reduction in energy consumption in the …
Recovery of gold from refractory gold ores: Effect of pyrite …
The extraction of gold from refractory gold ores (RGOs) without side reactions is an extremely promising endeavor. However, most RGOs contain large amounts of sulfide, such as pyrite. Thus, investigation of the influence of sulfide on the gold leaching process is important to maximize the utilization of RGOs. In this work, the effects of pyrite on the …
Minerals | Free Full-Text | Impact Crushing Characteristics …
College of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China * ... the multicomponent complex ore is simplified to comprise the three pure minerals pyrite, sphalerite, and quartz to ensure the universality and representativeness of the test. ... G.R.; Powell, M.S. Benchmarking comminution …
Comparison of the Microwave Absorption
Abstract We provide an understanding of the microwave absorption characteristics of hematite, magnetite and pyrite by measuring and comparing the microwave heating rate, dielectric and magnetic properties and the absorbed microwave energy. The three methods have their own advantages and disadvantages, and …
Mineral liberation analysis on coal components
The recovery rates of pyrite and quartz monomers for ball milling were 80.52% and 52.60%, respectively. ... The comminution and separation of multi-component mineral grains is a complex process (Partsinevelos et al., ... (FEI, USA), from the Oil Sands and Coal Interfacial Engineering Facility of the University of Alberta, Canada, was used …
Comminution employing liquid nitrogen pretreatments
The U.S. Department of Energy's Office of Scientific and Technical Information
Application of process mineralogy as a tool in
With the recent focus on sustainability in mining and the drive for resources companies to minimise the energy use in energy-intensive processes such as comminution and smelting, there is a need for tools which allow companies to optimise their process energy use. This research focuses on using quantitative mineralogy and …
Selective depression of arsenopyrite with in situ generated
1. Introduction. Pyrite, pyrrhotite, and marcasite are rich sources of naturally occurring sulfur elements. Of these, pyrite is the most abundantly available mineral on the earth's crust (Lundy, 1950).Its chemical formula is FeS 2, which is an important mineral resource mainly used in industry to produce sulfuric acid (Yang et al., 2009).Arsenic (As) …
A novel technology of high-voltage pulse discharge for comminution …
An innovative technology of high-voltage pulse discharge (HVPD) was proposed to investigate the comminution characteristics of galena ore. The optimal experiment parameters were determined as follows: spark gap spacing of 25 mm, pulse number of 120, and voltage of 25 kV. The mass fraction with size <0.074 mm in ground …
Development of a comminution test method for small ore …
Minerals Engineering. Volume 130, January 2019, Pages 5-11. ... a geometallurgical comminution test should fulfill the following requirements: (1) ... the main ore minerals being gold-bearing arsenopyrite and pyrite. The second sample was massive pyrite-based copper ore and the third one was limestone, consisting of calcite and …
Introduction to Mineral Processing
transportable by haul trucks or conveyors. Comminution in the mineral processing plant is carried out in a sequential manner using crushers and screens followed by grinding mills and classifiers. The various types of comminution equipment including their general application are described in detail below. 3.2.1 Crushing Equipment
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A process mineralogy approach to study the …
In the present study, the type and behavior of copper sulfide, molybdenite and associated gangue minerals, especially pyrite, have been identified through a process mineralogy …
Gold Extraction & Recovery Processes
In general, gold-pyrite or gold-copper minerals associations have no problems and gold can be recovered without major problem. The lack of good liberation is a problem and the comminution circuit is the key element. The treatment of auriferous pyrite or silver sulphosalts with gold, have an excellent recovery by flotation.
Short-pulse microwave treatment of disseminated sulfide ores
Conventional comminution requires 10 to 12 kWh/t for typical porphyry ore. Obviously, this is a very simplified assessment of the Short-pulse microwave treatment of sulfide ores 53 energy costs and neglects inefficiencies both in generation and absorption of the microwaves. However, this analysis is sufficient to suggest that a short-pulse ...
Pyrite Flotation
Can you list the factors affects the floatability of pyrite from refractory low grade ore. I used a Wemco lab flotation cell and aimed on analysing factors like collector dosages (PAX), Activator (Copper sulphate),MIBC, pH and others like pulp density and particle size (70 and 150 microns) .However how these factors affect the floatability of the pyrites from low …
Using Rock Geomechanical Characteristics to Estimate Bond …
It is worth noting that size reduction by comminution is a prerequisite for any downstream physical or chemical separation, and as the highest energy demand process, beneficiation operation is affected by the grindability power of the mineral [17]. 2.1 Grindability Tests. Grindability tests are performed to identify the ore rock comminution ...
Tackling problems in civil engineering caused by the …
Pyrite occurs widely as a minor constituent of geo-materials and many construction processes result in the exposure of pyrite-bearing materials to air and …
Engineering Implications of the Oxidation of Pyrite: …
It discusses the formation of pyrite and pyrrhotite and the chemical reactions involved in their oxidation, the effects of the oxidation process and how its by-products …