Method for producing salts with a reduced water of crystallisation content

A technology of crystal water and moisture content, which is applied in the direction of alkali metal carbonate to change crystal water content, chemical instruments and methods, and types of dried products, etc., and can solve problems affecting drying speed and other issues

Active Publication Date: 2015-12-23
ANDRITZ TECH & ASSET MANAGEMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As a result, drying speed will be affected

Method used

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  • Method for producing salts with a reduced water of crystallisation content
  • Method for producing salts with a reduced water of crystallisation content
  • Method for producing salts with a reduced water of crystallisation content

Examples

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Embodiment Construction

[0025] Blower 10 (see figure 1 ) extrudes the outside air through the hot air conditioner 11 into the drying unit (here a fluidized bed dryer) 12, in which the salt is optionally heated through the heat exchanger 13 and the crystallization water is discharged. The moist dry gas leaves the dryer, is dedusted in a filter or cyclone 14 and after optional additional gas cleaning via a suction fan 18 to the outside 19 . The surface-moistened crystal water-containing salt 20 is dusted in the mixer 21 with the dust deposited from the cyclone or the filter 14 and optionally with the returned product and conveyed to the dryer 12 . After drying, the salt leaves the dryer 12 and oversized particles are separated in an optional screen 22 , ground 23 and fed to a mixer 21 . Part of the material enters the overflow silo 24 , from which optionally the return material for the mixer 21 is withdrawn by means of a dosing screw conveyor 25 and the end product 26 is used for further processing. ...

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Abstract

The invention relates to a method for drying salts with a water of crystallisation content in convective apparatuses that can additionally be indirectly heated. The invention is primarily characterised in that the drying process takes place with a moisture content of the drying gas above a determined level. The gas surrounding the salt particles during the drying process therefore has a specific humidity. In this way, the rate of drying is positively influenced.

Description

technical field [0001] The invention relates to a method for drying salts containing water of crystallization in a convection device. Background technique [0002] Many salts form hydrate grades upon crystallization. Introduced water of crystallization is often undesirable because it increases shipping costs, reduces concentrations and in some cases leads to storage-unstable products. The size of the hydrate stage, ie the number of water molecules introduced, can in some cases be advantageously controlled by the crystallization conditions, but thermal dehydration cannot be avoided in many cases. The more water molecules are combined per salt molecule, the easier it is for the last combined water molecule to crack again, that is to say, as the number of water molecules that have been cracked per salt molecule increases not only increases the energy required to overcome the binding The energy required, but also increases the temperature required for cracking. Products with ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F26B3/00C01D5/18F26B17/00F26B21/08
CPCC01D1/44C01D3/22C01D5/18C01D7/35C01D9/18C01F5/34C01F7/58C01F11/30F26B3/04F26B3/06F26B21/086F26B3/00F26B17/00F26B21/08F26B2200/00C01G49/14C01P2006/82F26B3/20F26B21/04F26B21/06
Inventor 保尔·伯恩哈德·克勒尔
Owner ANDRITZ TECH & ASSET MANAGEMENT
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