Equipment and technology of calcium oxide producing with calcium sulfate

Abstract

The invention provides equipment and technology of calcium oxide producing with calcium sulfate. The equipment comprises a calcining kiln, a digestion chamber and a secondary calcining kiln, wherein the calcining kiln is communicated with a feed port at the top of the digestion chamber through a discharge port I at the bottom of the calcining kiln, the digestion chamber is divided into two layers which are separated through a filter screen I in the middle. A carbon dioxide inlet pipeline is arranged on the side wall of the digestion chamber and leads to the bottom of the digestion chamber, a discharge port II is arranged at the bottom of the digestion chamber and is provided with a filter screen II and a separating hopper, the filter screen II is in an inclined structure, a heat exchanger is arranged outside the wall of the digestion chamber, the separating hopper directly leads into a drying chamber with an open structure, the drying chamber is communicated with the secondary calcining kiln, the heat exchanger is connected with a heater, a condenser and a circulating pump in a closed mode in sequence through pipelines, and the heater is positioned at the bottom of the drying chamber. The invention further includes the technology of waste heat recovering with the equipment. Energy consumption is reduced by 10% or more, meanwhile purity and production efficiency of the calcium oxide product can be improved.

Description

technical field [0001] The invention relates to equipment and a process for producing calcium oxide, in particular to an equipment and process for producing calcium oxide with calcium sulfate. Background technique [0002] Calcium oxide is widely used in the manufacture of calcium carbide, soda ash, bleaching powder, refractory materials, as desiccants and soil improvers; as analytical reagents, fluxes for the manufacture of fluorescent powder; used in leather, wastewater purification; used as building materials, metallurgy Flux: It is the main raw material for the production of calcium hydroxide and various calcium compounds. [0003] The traditional calcium oxide production method mainly uses limestone as raw material. The calcination process adopts a shaft kiln, and the limestone and solid fuel are mixed together or layered into the kiln for combustion. In recent years, more and more calcium sulfate is used as a raw material for calcining to prepare calcium oxide. In ord...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the serious waste of low-temperature waste heat of equipment in the existing calcium oxide production process and affect the

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