Method for adjusting dissolved liquid by spieces mother liquid

A technology of separating mother liquor and adjusting height, applied in the direction of alumina/aluminum hydroxide, etc., can solve the problems of high supersaturation, muddy settling tank, decreased recovery rate of hydrolysis loss, etc., to increase stability, increase output, and improve economic effect

Inactive Publication Date: 2007-11-14
GUIYANG AL-MG DESIGN & RES INST
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  • Abstract
  • Description
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Problems solved by technology

Eluate α k Although the reduction of the value brings many benefits to the production, it also brings some adverse effects at the same time, such as Al in the solution 2 o 3 If the degree of supersaturation is too large, the stability of the sodium aluminate solution will decrease, and the Al 2 o 3 The increase in hydrolysis loss leads to a decrease in the recovery rate, and in severe cases, it may also cause the sedimentation tank in the subsequent process to run muddy, so that the red mud separation and washing processes cannot operate normally

Method used

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  • Method for adjusting dissolved liquid by spieces mother liquid

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Embodiment Construction

[0017] Embodiments of the present invention: first set up a float recovery process in the alumina plant, and set up float recovery facilities and install related equipment, and send the seed separation mother liquor into the float recovery process for float recovery, so as to avoid the seed separation mother liquor The hydrolysis loss of the dilution liquid increases due to the high content of floating matter; then the mother liquor recovered from the floating matter, the stripping slurry from the evaporator of the final ore pulp and the red mud washing liquid are added to the dilution tank together, the original Alkali Alkali α k The value is 1.30~1.35, and the dissolution liquid α is adjusted from the mother liquor k The role of the value, α k Adjust the value to 1.44~1.52; Alkali α of raw ore pulp k Value 1.30~1.35; diluent α of small alumina plant k The optimum value is 1.48~1.52, the diluent α of the large alumina plant k The value is 1.44 to 1.48. After adjustment a...

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Abstract

A method for adjusting stripped mother liquid is characterized by inducing a part of mother liquid in decomposition process, returning dilution section, entering stripped slurry and red mud cleansing solution from evaporator into thining tank simultaneously, adjusting stripped liquid alpha K value up to 1.30í½1.35, adjusting diluting liquid up to 1.44í½1.52 and adjusting alpha K value of original mineral slurry complex base between 1.30í½1.35. It can be used to produce alumina, increase stability of sodium aluminate solution and yield, and decrease dilution.

Description

Technical field: [0001] The invention relates to an alumina production process, in particular to a high-pressure dissolution process for alumina production. Background technique: [0002] In the past ten years, the dissolution process of my country's alumina plants has made great progress, and a variety of advanced dissolution technologies have been used and developed, such as the French A, P dissolution technology, the German VAW dissolution technology, and the whole Single casing preheating, pressure cooker insulation dissolution technology. [0003] Compared with the old dissolution technology in the past, they have been greatly improved. For example, the dissolution temperature has been increased from the original 240-245°C to 260-280°C. Greatly increased, the heat consumption of dissolution decreased; dissolution liquid α k Several key indicators for judging the dissolution effect, such as the ratio of red mud to alkali and the dissolution rate of alumina, have all imp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02
Inventor 陈德
Owner GUIYANG AL-MG DESIGN & RES INST
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