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System and method for the calcination of minerals

A technology of calcination and minerals, applied in the direction of chemical instruments and methods, calcination, lighting and heating equipment, etc., can solve problems such as environmental impact

Active Publication Date: 2009-06-24
CALIX PTY LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As mentioned above, the exhaust gas contains combustion and calcination gases, so this method has the same negative environmental impact as traditional calcination

Method used

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  • System and method for the calcination of minerals
  • System and method for the calcination of minerals
  • System and method for the calcination of minerals

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Embodiment Construction

[0056] The exemplary embodiments provide a continuous calcination system and method. A compact reactor with a number of features is described for accelerating the reaction rate so that the desired degree of reaction is about 96 to 98% complete (96-98 %complete). First, the catalysis of the steam acts on the calcination reaction of the particles. Furthermore, by using multiple reactor sections through which the particles can pass sequentially, the degrading effect of carbon dioxide re-entry into the calcined material is reduced due to the separation of carbon dioxide at the end of each section and, furthermore, by The carbon dioxide partial pressure in the reactor is lowered by injecting superheated steam to push the carbon dioxide out of the reactor, which lowers the carbon dioxide partial pressure near the reactor outlet. This superheated steam is injected with an initial pressure high enough to catalyze the reaction and push the particles through the reactor.

[0057] The...

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Abstract

A system and method for the calcination of minerals. The system comprises a vertically disposed reactor segment configured to impart horizontal forces on particles passing through the reactor segment in a vertical direction; an injector unit for receiving granular feedstock, the injector unit being disposed at a top portion of the reactor segment, whereby granules of the feedstock move through the reactor segment in a granular flow under at least one of a group consisting of a force of steam, gravitational force and a centrifugal force; a reactor heat exchange unit thermally coupled to a wall of the reactor segment for providing heat to the flowing granules inside the reactor segment through heat transfer through the wall of the reactor segment; one or more inlets formed in the reactor segment for introducing a superheated gas into the reactor segment to create conditions of a gas-solid multiphase system; and one or more exhaust openings formed in the retort segment such that gas products are at least partially flushed from the reactor segment under the flow of the superheated gas from the inlets to the exhaust openings.

Description

technical field [0001] The present invention generally relates to a mineral calcination system and method. Background technique [0002] Calcination of rock and ore materials such as metal carbonates to produce their oxide forms is a major source of greenhouse gas emissions. Currently used calciners are generally vertical furnaces optimized for their overall energy efficiency. A typical vertical furnace consumes 3.6GJ per tonne of lime to calcine limestone under best practice conditions, compared to the thermodynamic limit of 3.18GJ per tonne. These vertical furnaces have generally replaced earlier inefficient horizontal rotary furnaces. Other furnaces for special applications include fluidized bed reactors and circulating fluidized bed reactors. [0003] carbon dioxide emissions [0004] Calcination has been recognized as a major greenhouse gas generating source, accounting for 2.5% of all emissions from human activities. Calcining carbonates inherently produces carbon...

Claims

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Application Information

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IPC IPC(8): B01J6/00C04B2/12C01F11/18F27B1/00
CPCF27B17/00C01B13/18B01J6/004C01F11/06F27D17/004F27B1/00B01J8/087B01J2208/00292C01F5/08C04B2/12B01J8/082B01J2208/0053F27D13/00Y02P40/40C22B1/10
Inventor 康纳·J·霍利马克·G·西茨
Owner CALIX PTY LTD
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