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Process for turning waste solution from production of soda to lime

A technology of alkali-making waste liquid and water-cement ratio, applied in the field of ash, can solve the problems of inability to meet production needs, easy stratification, low concentration, etc., and achieve significant economic and social benefits, less sand, and high concentration.

Inactive Publication Date: 2009-05-06
TIANJIN BOHUA YONGLI CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the past, the ashing of soda-making waste liquid was mixed with fresh water and sent to ash, so that the obtained ash milk ACaO (A in ACaO is the abbreviation of active, CaO is the molecular formula of calcium oxide, ACaO Indicates effective calcium oxide, the same below) Compared with freshwater ash, the concentration is lower, the sand is more, and it is easy to stratify. The ash milk ACaO can only reach 180-200g / l, which fails because it cannot meet the production needs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Quick lime g 100

[0025] Volume of fresh water for digestion ml 40

[0026] Digested water-cement ratio 0.4

[0027] Freshwater temperature for digestion °C 60

[0028] Digestion time min 7

[0029] Fresh water volume for milk production ml 160

[0030] Milk powder waste liquid volume ml 100

[0031] Total water-cement ratio 3.0

[0032] Milk water (after mixing river water and waste liquid) temperature ℃ 80

[0033] Milk time min 5

[0034] Available calcium oxide ACaO g / l 204

[0035] The operation steps are as follows: under the condition of stirring, the fresh water for digestion in this example is added to the container with the quicklime, the water and the quicklime are mixed uniformly, and the digestion reaction is carried out for 7 minutes, and the milk-making alkali waste liquid is added and continues to stir for 5 minutes, Made of lime milk.

[0036] The operation steps of the following embodiments are basically the same.

Embodiment 2

[0038] Quick lime g 100

[0039] Digestion river water volume ml 50

[0040] Digested water-cement ratio 0.5

[0041] Digestion river water temperature ℃ 50

[0042] Digestion time min 2

[0043] Fresh water volume for milk production ml 150

[0044] Dairy waste liquid volume ml 100

[0045] Total water-cement ratio 3.0

[0046] Milk waste liquid temperature ℃ 85

[0047] Response time min 8

[0048] Available calcium oxide ACaO g / l 210

Embodiment 3

[0050] Quick lime g 100

[0051] Volume of river water for digestion ml 70

[0052] Digested water-cement ratio 0.7

[0053] Digestion river water temperature ℃ 50

[0054] Digestion time min 4

[0055] Fresh water volume for milk production ml 30

[0056] Dairy waste liquid volume ml 100

[0057]Total water-cement ratio 3.0

[0058] Milk waste liquid temperature ℃ 80

[0059] Response time min 7

[0060] Available calcium oxide ACaO g / l 277.2

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PUM

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Abstract

A process for preparing lime milk from waste alkali solution includes slaking calcium lime with fresh water, mixing fresh water with said waste alkali solution, and diluting the slaked resultant with the liquid mixture to obtain lime milk. Its advantages are high blending quantity of waste alkali solution (15-85%), low content of sand, and high ACaO (225-280 g / L).

Description

technical field [0001] The present invention relates to a method for ash removal, in particular to a method for liquefying ash from waste alkali production. Background technique [0002] In the process of producing soda ash by the ammonia-alkali method, about 10m 3 Left and right waste liquid, the main components in waste liquid are NaCl and CaCl 2 , the concentrations are 50-70g / l and 95-115g / l respectively, and the PH value is 10-11. Ammonia soda ash plant with an annual output of 700,000 tons emits 7 million m 3 It takes a lot of human and financial resources for environmental treatment, and a lot of materials are wasted at the same time. In order to reduce the discharge of waste liquid, NaCl and CaCl in waste liquid are recovered 2 , various experimental studies have been done, and waste liquefied ash is one of them. [0003] Described ash, namely adding a certain amount of water to quicklime CaO to carry out digestion reaction quick-slaked lime Ca(OH) 2 , and then...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D7/18C04B2/04
Inventor 薛邦春常洪林
Owner TIANJIN BOHUA YONGLI CHEM IND