Mineral Processing Engineering

Four de Fusion

Six Elements De Carbure De Silicium

Sont installes sous la plaque d’enfournement. Le nombre, la configuration et la disposition des elements, tels que developpes par le Service d’ingenierie de PYRADIA, permettent d’atteindre une montee et une uniformite superieure de temperature. La densite de puissance des elements est basse pour une duree de vie prolongee.

Les fours fonctionnant sur 3 phases sont congus afin que les 3 phases soient parfaitement balancees. Cette caracteristique vous assure une demande d’amperage uniforme sur chaque ligne pour une utilisation maximale de votre capacite electrique.

Nous savons qu’aussi bien construits qu’ils le soient, les fours ne peuvent resister eternellement aux utilisations severes et souvent abusives auxquelles ils sont soumis. Aussi, nous construisons chacun de nos fours de fagon a permettre des reparations rapides et une remise en etat complete du four a faible cout.

Nous fournissons des pieces pour toutes les marques de fours industriels. Nous construisons aussi selon vos specifications.

four d’essai specifications

four d’essai industrie miniere

Four D’Essai Industrie Miniere

PYRADIA est un manufacturier de fours reconnu aupres de I’industrie miniere pour la conception et la fabrication d’equipements sur specifications. Cette connaissance

By | 2018-02-25T14:09:23+00:00 February 25th, 2018|Categories: Uncategorized|Tags: |Comments Off on Four de Fusion

Haulage Truck Bumper Design

The extended Haulage Truck bumper was developed to provide protection to the operator in the event of a rear-end collision between trucks. This protection is necessary because the outcome of a rear-end collision between trucks often results in the rear-end of the dump body of the forward truck penetrating the cab area of the rearward truck (fig. 1), causing operator injury, as well as extensive machine damage. Figure 2 shows the relationship of the height of the rear of the dump body in relation to the top of the cab and operator’s platform for various truck models. This indicates that for most truck combinations, the height of the dump body is at a level to penetrate the cab area. Figures 3 and 4 show the results of truck collisions in which the dump bed penetrated the cab area of another truck, in each case, causing serious injury to the operator and major truck damage. The goal of this program was to design a bumper extending far enough in front of the existing bumper to prevent any intrusion of a dump bed of one truck into the operator’s cab of another truck during a collision.

To achieve this goal, one solution was

By | 2018-02-25T11:45:21+00:00 February 25th, 2018|Categories: Equipment|Tags: |Comments Off on Haulage Truck Bumper Design

Turbomilling Comminution of α-SiC Silicon Carbide

Interest has been increasing in recent years in structural materials that can withstand severe conditions of temperature, pressure and environment, and can substitute for high-temperature alloys that require imported materials such as chromium, cobalt, and nickel.

As a result, the utilization of ultrafine, high-purity ceramic powders in advanced and composite ceramics is increasing. Nonoxides such as SiC and Si3N4 have shown promise in meeting the requirements for use in heat engines, heat exchangers, and other areas where high temperatures and pressures are required.

The Bureau of Mines turbomill (also known as an attrition grinder) has been used in the past to produce a wide variety of ultrafine materials. This technique, originated and patented by the Bureau O), consists of intense agitation of a milling medium, the material to be milled, and a suspending liquid. A previous report summarized research on turbomilling and discussed commercial applications of the process.

In a recent report, Wittmer discussed the development of an all-polymer mill. The construction of the all polymer mill eliminated metal contamination of the mill product. Wittmer’s report also describes the use of autogenous milling, in which the milling medium and the material to be milled are of the same or similar composition. In this

By | 2018-02-25T11:47:51+00:00 February 25th, 2018|Categories: Grinding|Tags: |Comments Off on Turbomilling Comminution of α-SiC Silicon Carbide

Leaching Method for Recovering Silver & Manganese

In support of its goal of maintaining an adequate supply of minerals to meet national economic and strategic needs, the Bureau of Mines has investigated the feasibility of in situ and heap leaching to recover manganese from low- and medium-grade domestic manganese deposits and to also recover the silver found in some of these manganese deposits.

In situ leaching technology has been successfully used for uranium and copper. Heap leaching is an important method for recovery of gold, silver, and copper. These leaching technologies have the advantages over conventional mining of lower capital and operating costs, shorter startup times, and environmental and safety improvements. Thus, in situ or heap leaching is a favorable method for small and/or low-grade deposits that would not otherwise be mined. Most of the more than 2,100 low-grade manganese deposits in 35 States fall into this category.

Previous Bureau research indicated the technical feasibility of recovering manganese from low-grade deposits by in situ leaching with aqueous SO2. Manganese recovery ranged from 60 to 95 pct for oxide and carbonate deposits. As an offshoot of this project, the feasibility of recovering silver and manganese from refractory silver deposits was evaluated. These deposits are refractory because the silver Is either

By | 2018-02-25T08:46:45+00:00 February 25th, 2018|Categories: Hydrometallurgy|Tags: |Comments Off on Leaching Method for Recovering Silver & Manganese

Inorganic Grouts

In most U.S. coal mines, and in many metal mines, rockbolts are the primary means of roof support. The majority of roof bolts can be divided into two major categories: (1) those using mechanical anchorage and (2) those using grouted anchorage. Mechanically anchored bolts use a slot, wedge, or an expansion shell that physically locks the anchor to the rock as the bolt is tensioned. Grouted bolts use a grouting medium to attach the bolt to the rock. The upper end of the bolt may be grouted (point anchorage), or the entire length may be grouted (full-column anchorage).

Grouted bolts are made of reinforcing steel (rebar) and usually have a bolthead forged at one end. Cement has been used to anchor the rebar, but it has a slow set time. To overcome the slow set time, resins (usually polyester, with fillers) have been developed for use as a grouting material. The resins and fillers are blended to achieve an acceptable compromise between performance and cost. Because the resin is a petroleum derivative, it will be sensitive to future oil price increases. Also, there are potential hazards from toxicity during handling and from accidental ignition of the resin. To counter these problems,

By | 2018-02-25T08:49:32+00:00 February 25th, 2018|Categories: Laboratory Procedures, Mining|Tags: |Comments Off on Inorganic Grouts

Cobalt Flotation Recovery

Cobalt Flotation Studies were conducted on ores from the Viburnum trend in southeast Missouri. The Viburnum trend deposits occur along the flank of the St. Francois Mountains. Ores of the Viburnum trend are characteristically complex mixtures of the sulfide minerals galena, PbS; sphalerite, ZnS; chalcopyrite, CuFeS2; pyrite, FeS2; marcasite, FeS2; and the cobalt-nickel mineral siegenite, (Ni,Co)3S4, hosted in a gangue of dolomite, (Ca,MgXC03)2, with minor inclusions of quartz, SiO3, and calcite, CaCO3. Minor amounts of other sulfides are also found; these include: bravoite, (Fe,Ni)S2; millerite, NiS; bornite, CusFeS4; chalcocite, Cu2S; digenite, Cu2-xS; djurleite, Cu1.96S; polydymite, Ni3S4; vaesite, NiS2; gersdorffite, NiAsS; tennantite, (Cu, Fe)12As4S13; arsenopyrite, FeAsS; pyrrhotite, Fe1-xS; and covellite, CuS.

The major cobalt source in the ore is the mineral siegenite. Separation and concentration of siegenite by froth flotation is complicated by the mineralogy of the ore. The siegenite is often present as an intimate replacement intergrowth with chalcopyrite (fig. 1), sphalerite, galena (fig. 2), and the iron sulfides, pyrite and marcasite. Current grinding practice in the mills tends to leave the siegenite as binary locked particles in the various product streams (fig. 1). Therefore, further grinding to liberate the siegenite particles is required, but is limited by the lower

By | 2018-02-24T11:13:59+00:00 February 24th, 2018|Categories: Flotation|Tags: , |Comments Off on Cobalt Flotation Recovery

Water Jet Rock Breaking & Chipping

This report presents the results of a study to investigate the rock breakage process, by analysis of the rock debris produced during laboratory jet-assisted cutting tests. Recently there has been interest in water-jet-assisted cutting of rock, using low-volume water jets, with pressures up to 10,000 psi.  The motivation for this is to reduce the amount of fines generated and to reduce cutting head torque and thrust, enabling deeper and more widely spaced cuts to be taken, hopefully overcoming problems of torque fluctuation. This led a joint project between the Bureau of Mines and the British National Coal Board. Under this project a Dosco roadheader was retrofitted with high pressure water-jet- assist system in order to increase its ability to cut the harder coal measure rocks. Observations during cutting trials showed a reduction in dust generation and frictional sparking, as well as significant increases in tool life. Water-jet-assist also has the potential to reduce machine vibration and improve the productivity of shearers and continuous miners, especially in seams where difficult cutting conditions are encountered.

In order to obtain the full benefit from water-jet-assisted cutting, it is not adequate to just add a high-pressure jet-assist system to drums designed for mechanical cutting. To

By | 2018-02-24T11:16:05+00:00 February 24th, 2018|Categories: Mining|Tags: |Comments Off on Water Jet Rock Breaking & Chipping

Rock Drag Cutting

The Bureau of Mines, in its continuing efforts to improve productivity and enhance the workplace environment of hard-rock underground mines, has investigated mechanical excavation techniques and in particular drag cutting techniques to achieve these goals. Two fragmentation techniques that use drag cutters have found some success in the mining industry: the kerf-core technique and, the conventional technique.

The conventional technique is characterized by machines that use a multiplicity of cutters fixed to a rotating cutterhead that make shallow, parallel cuts spaced sufficiently close to break out the intervening material (fig. 1). This most common drag cutting excavation technique is represented in the industry by drum-type continuous miners and roadheaders. Some of these machines employ over 100 individual cutters on a single cutterhead that may rotate at speeds up to 70 rpm. These machines are generally limited in the amount of cutting force they can supply by their own weight. Because of the high cutter speeds and the low cutter forces available, continuous miners are limited by their performance to coal or very soft rock; roadheader machines can be used in rock with compressive strength up to 12,000 to 18,000 psi, depending on its abrasiveness.

In contrast, the kerf-core technique is characterized by

By | 2018-02-24T07:38:06+00:00 February 24th, 2018|Categories: Methods|Tags: |Comments Off on Rock Drag Cutting

Best Air Sparging System for Column Flotation

Objective: Provide a low-maintenance, reliable means of generating bubbles and controlling bubble size for column flotation.

Approach: Commercial sparger systems used in flotation columns to process minerals provide only limited means of controlling the size of bubbles generated and the rate of air injection. Generally, these limitations are a detriment to flotation performance, particularly in recovering coarse or fine mineral particles. In addition, conventional bubble generation systems require frequent maintenance, often requiring shut-down of the column itself for repairs. To permit greater control of the bubble size generated in the flotation column and to eliminate the counter-productive problems associated with the operation of current air sparger systems, the Bureau of Mines investigated alternative methods for generating bubbles. Based on the investigation, an external bubble generation system was designed, developed, and laboratory and commercially tested.

External System

The improved gas sparger system is a pressurized mixing chamber (bubble generator) equipped with a gas injection mechanism that can be used to control bubble size from less than 0.2 mm to 4 mm average bubble diameter with surfactant dosages of less than 13 ppm. It is the first external bubble generation device that allows control of bubble size. Lower surfactant dosages and

By | 2018-02-24T07:40:07+00:00 February 24th, 2018|Categories: Flotation|Tags: |Comments Off on Best Air Sparging System for Column Flotation

Water Jet Cutting

Objective: Determine the advantages and operational limitations of water-jet-assisted cutting used with mining equipment.

Approach: The Bureau of Mines conducted a research study to evaluate water-jet-assisted cutting both in the laboratory and in underground mines. Earlier research on water-jet- assist was limited to laboratory studies where bit speeds and penetration depths were very low and large cutting force reductions were reported. For the past years, research by the Bureau of Mines and others has been concerned with the application of water-jet-assisted cutting under more realistic mining conditions.

Study Results

Water-jet-assisted cutting employs a mechanical cutting bit combined with a moderate to high-pressure water jet directed just in front of the bit tip to assist in the cutting process. Recent Bureau findings show that the addition of the water jet to the cutting bit can improve cutting in harder materials, significantly reduce respirable dust and bit wear, and increase product size. Some of these findings are presented as follows.

Cutting Performance

Research study findings show that the impact of water-jet-assist on the cutting performance of mining equipment is a function of bit speed, bit penetration, and the type of material being cut. In hard materials, the water-jet-assist can improve cutting. Water-jet-assisted roadheaders,

By | 2018-02-24T07:34:23+00:00 February 24th, 2018|Categories: Mining|Tags: |Comments Off on Water Jet Cutting

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