mineral processing technology and mineral processing equipment

In practice, size reduction of mineral particle assemblies is accomplished stepwise in commercial devices. The complicating features in the breakage of large assemblies of particles are the different particle sizes and strengths and the sometimes random way in which stress is applied in the various steps. In mining operations, blasting with explosives is usually the first step in the comminution sequence. During blasting, high-velocity gas pressure pulses created by the explosives load blocks of ores to provide initial fragmentation. The next step in mineral processing plant is typically crushing, which is accomplished by slow compression of large particles (greater than 1 cm) against rigid surfaces. The mechanism of breakage in the crushing step is contrasted with subsequent size reduction by tumbling or stirred mills in which breakage of smaller particles (less than 1 cm) is accomplished by a combination of impact, chipping, and abrasion events caused by energy transferred from gri...

Gyratory crushers were invented by Charles Brown in 1877 and developed by Gates around  1881 and was referred to as a Gates Crusher . The smaller form is described as a cone crusher. The larger crushers are normally known as primary crushers as they are designed to receive run-on-mine (ROM) rocks directly from the mines. The gyratory crushers crush to reduce the size by a maximum of about one-tenth its size. Usually metallurgical operations require greater size reduction, hence the products from the primary crushers are conveyed to secondary or cone crushers where further reduction in size takes place. Here the maximum reduction ratio is about 8:1. In some cases installation of a tertiary crusher is required where the maximum reduction is about 10:1. The secondary crushers are also designed on the principle of gyratory crushing but the construction details vary. Similar to jaw crushers, the mechanism of size reduction in gyratory crushers is primarily by the compressive action of...

Sinonine know that as the ore crushing is performed in stages, crushing may be divided into primary, secondary, tertiary and quaternary stages based on the particle size. Correspondingly, the crushers can be classified into five groups according to the size of the product they produce. ---- Primary Crushers: Jaw crusher , Gyratory crusher. ----Secondary Crushers: Reduction gyratory, Cone crusher , Rolls crusher. ---- Tertiary Crushers: Short-head cone crusher. ----Fine Crushers: Impact crushers. ----Special Crushers: Bradford Breaker, Toothed Roll crusher. Lumps of run-of-mine ore usually of 1 m size is reduced to 100–200 mm size in heavy duty primary crushers. The usual size of feed to secondary crushers is 600 mm and the product is usually 10–100 mm size. In tertiary crushers, particles of 250 mm size are reduced to 3–25 mm size. Fine crushers reduce the coarse particle to fine, even to 200 mesh in some cases. Special crushers are designed for specific ores, for exampl...

At the end of 2012, Sinonine signed A Lead-Zinc Beneficiation EPC Contract with a customer in Africa. This 1000TPD Lead-Zinc Beneficiation Production Line adopts three stage crushing with single closed circuit stage process, primary grinding-spiral classifier, selective flotation of lead, and then flotation of zinc, adopting a circuit of one rough flotation, one scavenger and two concentrating, concentrate piled on site after enrichment, tailings dry discharge after enrichment, filtering. Sinonine undertakes lead-zinc mining engineering design and supplies ol beneficiation palnt EPC , factory building, non-standard equipment, electrical automation, guides installation and commissioning on site, so the production line works well and all indexes meet the design requirements. The production line design and equipment manufacturing are synchronous, so total cost is low, the project construction organization is scientific , good economic benefit is realized. It combine s flotation machine...