Energy-saving using method for circular batching of carbon mother liquor

A technology of carbon separation and evaporation of mother liquor, which is applied in the direction of carbonate preparation, bicarbonate preparation, alkali metal aluminate/alumina/aluminum hydroxide preparation, etc. Alkali boiling, frequent washing, frequent parking and other problems, to achieve the effect of promoting and applying in industrialization, significant economic and social benefits, and good energy saving effect

Active Publication Date: 2010-03-31
山东铝业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to ensure the balance of water volume, it is necessary to use a standard forced circulation evaporator that can evaporate a higher concentration of mother liquor (260-280g / l) to evaporate, and the efficiency is low (0.4-0.5 tons-steam / ton-water), and the evaporator is boiled with alkali, Frequent flushing, frequent parking, unable to guarantee long-term continuous operation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The energy-saving carbon-separated mother liquor circulating batching using method of the present invention is carried out according to the following steps successively:

[0019] (1) The temperature is 70-80°C, Na 2 CO 3 Concentration of 345g / l, Al 2 o 3 The high-concentration carbon fraction mother liquor with a concentration of 0.6g / l is pumped into the carbonization tower, and flows down from the top of the tower through each layer of sieve plates, with a pressure ≥ 2.5kgf / m 2 CO 2 The gas goes up through the pipeline from the bottom of the carbonization tower through the ventilation holes of each layer of sieve plates, and contacts with the high-concentration carbon mother liquor in reverse to react to form sodium bicarbonate and form sodium bicarbonate slurry.

[0020] (2) The sodium bicarbonate slurry at 60-65°C is pumped to a vacuum drum filter or a horizontal belt filter for liquid-solid separation. The separated sodium bicarbonate crystals are recycled for...

Embodiment 2

[0024] The energy-saving carbon-separated mother liquor circulating batching using method of the present invention is carried out according to the following steps successively:

[0025] (1) The temperature is 70-80°C, Na 2 CO 3 Concentration of 355g / l, Al 2 o 3 The high-concentration carbon fraction mother liquor with a concentration of 0.9g / l is pumped into the carbonization tower, and flows down from the top of the tower through each layer of sieve plates, with a pressure ≥ 2.5kgf / m 2 CO 2 The gas goes up through the pipeline from the bottom of the carbonization tower through the ventilation holes of each layer of sieve plates, and contacts with the high-concentration carbon mother liquor in reverse to react to form sodium bicarbonate and form sodium bicarbonate slurry.

[0026] (2) The sodium bicarbonate slurry at 60-65°C is pumped to a vacuum drum filter or a horizontal belt filter for liquid-solid separation. The separated sodium bicarbonate crystals are recycled for...

Embodiment 3

[0030] The energy-saving carbon-separated mother liquor circulating batching using method of the present invention is carried out according to the following steps successively:

[0031] (1) The temperature is 70-80°C, Na 2 CO 3 Concentration of 345g / l, Al 2 o 3 The high-concentration carbon mother liquor with a concentration of 0.8g / l is pumped into the carbonization tower, and flows downward from the top of the tower through various sieve plates, with a pressure ≥ 2.5kgf / m 2 CO 2 The gas goes up through the pipeline from the bottom of the carbonization tower through the ventilation holes of each layer of sieve plates, and contacts with the high-concentration carbon mother liquor in reverse to react to form sodium bicarbonate and form sodium bicarbonate slurry.

[0032] (2) The sodium bicarbonate slurry at 60-65°C is pumped to a vacuum drum filter or a horizontal belt filter for liquid-solid separation. The separated sodium bicarbonate crystals are recycled for batching, ...

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PUM

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Abstract

The invention relates to an energy-saving using method for circular batching of carbon mother liquor, which belongs to the technology of alumina production. The method is characterized by comprising the following steps: (1) introducing high concentration carbon mother liquor into a carbonizer to perform carbonization, separating out sodium hydrogen carbonate crystal after further reaction of the sodium carbonate, carbon dioxide and water so as to form sodium hydrogen carbonate slurry; and (2) after sedimentation and thickening, filtering and separating the sodium hydrogen carbonate slurry by using a vacuum filter to prepare solid sodium hydrogen carbonate and filtrate, returning the sodium hydrogen carbonate crystal to a batching system for batching; performing wet decomposition on the filtrate, converting the sodium hydrogen carbonate in solution into sodium carbonate through heat decomposition, evaporating the sodium carbonate, and using the evaporated mother liquor for circular batching. The method effectively reduces the moisture of raw slurry of a clinker calcining kiln, has good energy-saving effect, low cost, is simple and practical, and is easy to implement.

Description

technical field [0001] The invention relates to an energy-saving method for using carbon-separated mother liquid circulating batching, which belongs to the alumina production technology. Background technique [0002] In the production of alumina by sintering method, the mother liquid of carbon fraction containing high concentration of sodium carbonate is evaporated and concentrated, then recycled to prepare raw slurry. The use of this process scheme can greatly reduce the concentration of sodium carbonate in the carbon fraction mother liquor, and can reduce the steam-water ratio of evaporation when evaporating with an evaporator, thereby reducing the evaporation cost. The solid crystallization of sodium bicarbonate produced by the process is returned to the batching, which can effectively reduce the moisture brought in when the raw material is put into the clinker rotary kiln for calcination, thereby significantly reducing the energy consumption of the sintered alumina produ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/14C01D7/10C01D7/12
Inventor 隋健卢家喜钱记泽张正基秦念勇刘玮王少武董鹏
Owner 山东铝业有限公司
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