Источник: http://www.accessmylibrary.com/article-1G1-12420287/puerto-rico-largest-plant.html
Puerto Rican Cement's Ponce Plant has been in operation for almost 50 years. The history of the plant and the growth of its production capacity indicate how closely it has developed with and contributed to the development of Puerto Rico. Started in 1942, it today has a production capacity of over twenty times its original size. The Ponce Plant has the greatest capacity and is the largest producer of cement on the island. As such, it supplies over 60% of Puerto Rico's total cement requirements.
The Plant has been modernized and expanded many times during this 50 year period growing from a single wet kiln to the present single preheater/precalciner kiln producing 3100 stpd. At the time of the conversion, only five of the six wet kilns were operable and only the three largest were producing clinker.
In addition to the company's cement interest, Puerto Rican Cement also produces both chemical and construction lime in an adjacent plant facility and manufactures paper bags in its subsidairy St. Regis Paper & Bag Company.
The raw materials used at the plant consist of clay and two types of limestone, high silica and high calcium.
The limestone is a relatively soft, slightly brownish stone common to this part of Puerto Rico. All of the deposits are near the plant and are hauled by truck to the new 1500 stph in-plant crushing facilities. These new facilities eliminated the two shift operation which was required with the existing crushing system. The new system utilizes a typical crushing circuit for this application. Under the truck dump hopper is a variable speed apron feeder which discharges onto a variable speed wobbler feeder to remove the undersized material and to transport the remainder to the 2000HP hammermill. Product is collected on a rougher belt which discharges onto a 630 ft long conveyor. This conveyor in turn transports the material to the existing stacker conveyor at the raw material storage hall. The current 1 1/2 inch product size is a result of the crusher and wobbler being adjusted for slurry ball mill grinding -- which was in operation during the first six months of the dry process start-up -- and not having been reset for roller mill operation.
The clay and high silica limestone is stored in new open topped bins which were installed in the existing raw material storage hall. Variable speed belt feeders withdraw the material from these bins and feed it onto an existing belt conveyor which originally.