The United States is the largest rock producer in the world. About 30% of the world production in 1990 was produced by the United States (Bartels and Gurr 1994). This level of production has continued to the present. The State of Florida generates approximately 70% of the U. S. annual production of about 40 million tons (Harben 1980). A typical beneficiation process in central Florida includes washing, classification, fatty acid flotation, acid scrubbing, and amine flotation. The upgraded concentrate is used for toothpaste, detergents, food, fertilizers, etc. Approximately 95% of produced is consumed in fertilizer machines where phosphorus, together with nitroge n and potassium, is utilized as the major nutrient for machines.
In fertilizer machines, is used to produce phosphoric acid by reacting with sulfuric acid. The phosphogypsum crystals formed during this chemical reaction are discarded and the phosphoric acid is further processed to give the finished fertilizer product. To increase the chemical reaction rate, rock is ground to fine particle sizes prior to the chemical reaction process. It usually takes 10-15 minutes of grinding to reduce size to more than 40% -200 mesh. The direct operating costs in grinding are mainly the energy cons umed and the metal lost through wear and corrosion. Fine grinding of is en ergy intensive and more than 60% of the electrical energy consumed in the fe rtilizer machine is used in grinding rock. Thousands of tons of grinding medi a is consumed in chemical machines every year. Reducing wear and corrosion ra tes will significantly reduce the grinding costs and improve the grinding efficiency by maintaining optimal grinding ball size.
This machine has made a great improvement in the structure compared with the traditional one. Its cylinder and supporting fame compose an integral system, thus, when it is being fixed, it will be hung on the foundation once. Equipped with double-tiered centripetal roller bearing, its power consumption will be reduced by 30%. The intrinsic grill pattern forcing discharge is replaced by overall pattern controlling discharge, which enhances the fineness of final product, and meanwhile increase the capacity by 15-20%.
In its operation, there is fixed factors such as: the ore hardness, the particle size after crushing, and the bar grizzly sieve pore, the model, and the steel quality. And those factors are established in the early stage of the machine design and milling technology. It is a common phenomenon that nowadays many mineral selecting factories have problems of unreasonable design, improper equipment installation, or unqualified quality. Following is the presentation of those factors: The machine’s installation is a centric and the gearing mesh between the gearwheel and pinion deviate. Its speed reducer gear in the transmission part has sand hole. After the equipment is installed and in operation, the gear-wear problem will appear.
The equipment model: different ball mill types can satisfy different products technology demands. This factor must be considered and chosen carefully when making mill design. The points which can embody the operator manipulation skills are whether they can master the daily modulator main technical parameters with high efficiency. The main parameters are: the water supply, the machine ore discharge mouth water filling condition and the feeding amount.
When the Raymond mill cylinder rotates, the steel will be brought to certain height. Due to the gravity of the steel grinding, it falls down along certain orbit. The machine steel grinding is pressed by two forces: one is the force pressed from the tangential direction when the barrel rotates; the other is the force which is symmetrical to the steel grinding diameter, and this acting force is generated by the sliding due to the device steel grinding self weight.
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Raymond mill:http://www.hxjq-crusher.com/11.html
rock crushers:http://www.crusher-machine.com/1.html
Rock cone crusher:http://www.crusher-machine.com/4.html
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