When the hydration reaction takes place water vapor is released to atmosphere and it drags lots of powder. CimprogettiI's solution to this environmental problem is a family of automatic bag filters designed for the purpose: the Cim-Zeropoll. Thanks to the special design which Cimprogetti applied during the Cim-Zeropoll development, the filter allows reduced maintenance cost. The filtering bag guaranteed life is one year (expected average life in excess of 24 months). The filter is located on the top of the hydrator as a result of long studies of several alternative positions. The filtering sizing and operating parameters are also the result of several years testing to determine the right air to cloth ratio and the most suitable fabric to ensure an extended operation life. Dust contents at the chimney outlet extremely reduced (<10 mg/Nm3). The Cim-Zeropoll has been successfully installed on many different hydrators makes worldwide.
Multi-stage hydrator series
Besides burned lime (or quicklime), hydrated (or slaked) lime is the second major product of the lime industry. As many of the newer applications require top hydrate qualities, manufactured under strictly controlled conditions, Cimprogetti has developed a comprehensive range of equipment and plants to meet even the most demanding requirements in the market.
Cimprogetti has developped the Cim-Hydrax hydrator, the latest achievement in lime hydration technology.
Cim-Hydrax(basic model)
Cim-Hydrax-TG
Cim-Hydrax-4G(for special applications)
The basic principles which have led at first to the design of the Cim-Hydrax series, are mainly the following:
A compact machine capable to convert a given raw material into high quality finished products with continuous operation
Sturdy construction, easy to operate with minimum maintenance required
High flexibility in terms of turn-down ratio
Wide range of raw material qualities acceptable
Wide range of finished products achievable
Possibility of an automated, unmanned control.
The main body of the machine consists of two or three superimposed chambers, called “stages”. In the first stage, the quicklime receives the hydration water from the water feed rack and is subject to a strong mixing action. At the end of the first stage the lime falls into the second stage where the hydrating reaction is mostly or wholly completed. During the transformation of the calcium oxide into hydrate the apparent specific weight of the material is basically reduced to a half. For this reason, the second stage volume is twice as big as the one of the first stage. The third stage (whenever provided) is designed to further homogenise the finished product, or to allow an extra retention time to complete reaction for those quicklime qualities featuring medium or low reactivity. An adjustable weir allows the lighter hydrated material to overflow to the discharge, while most of the over-burned lime (when in lumps) with a slower reaction speed and a higher specific weight may be retained for a longer period enabling the final reaction to take place. The unburned material (when in lumps) may also be collected on the bottom of this stage from where it is periodically removed.
The distinctive features of this hydrator are the following:
The first stage has two high-speed counter-rotating shafts with widely overlapping paddles, producing a strong stirring effect and consequently a sharp decrease of agglomerations at the hydrator outlet
The variable speed in the first stage permitting to adapt the mixing strength and retention time to a very wide range of lime qualities
The multi-point water injection in connection with a sophisticated instrumentation and control of the reaction ensures an effective and stable operation.
High efficiency separators
The Cim-Microsep is the high efficiency separator designed by Cimprogetti to separate the fine from the coarse sized material. It may either be used efficiently as a stand alone compact unit or in a closed circuit with almost all types of grinding equipment. TheCim-Microsep-HS model is gravity fed and the material is loaded from the top, whilst the Cim-Microsep-PN model is an air swept unit where the gas-particle suspension enters the separator from the bottom. The principle of operation combines the material feed dispersed in a transport airflow which is conveyed through a rotating cage to select the desired cut. The Cim-Microsep-HS features the highest flexibility and performance thanks to the possibility to adjust both the transport air flow and the selection cage rotation speed, in any combination, to suit each specific product to be separated.
