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Purifying process of mirabilite type brine by adopting lime-carbon dioxide process

A carbon dioxide and brine purification technology, which is applied in chemical instruments and methods, inorganic chemistry, alkali metal chlorides, etc., can solve the problems of increasing the purification cost of mirabilite-type brine, rising prices of soda ash, etc., and achieve reduced steam consumption and long production cycle , The effect of reducing carbon dioxide emissions

Inactive Publication Date: 2013-09-18
CHINA CEC ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the prices of caustic soda and soda ash continue to rise sharply, the cost of purification of Glauber's salt brine has been greatly increased

Method used

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  • Purifying process of mirabilite type brine by adopting lime-carbon dioxide process
  • Purifying process of mirabilite type brine by adopting lime-carbon dioxide process
  • Purifying process of mirabilite type brine by adopting lime-carbon dioxide process

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Embodiment 1

[0036] Embodiment 1 adopts attached figure 1 Intermittent Glauber's salt type brine purification process; Embodiment 2 adopts attached figure 2 Continuous Glauber's salt type brine purification process; Embodiment 3 adopts attached image 3 Intermittent Glauber's salt type brine purification process; Embodiment 4 adopts attached Figure 4 continuous mirabilite type brine purification process.

[0037] Example 1:

[0038] The composition of Glauber's salt brine is: H 2 O: 880g / l; NaCl: 295g / l; Na 2 SO 4 : 23g / l; CaSO 4 : 1.5g / l; MgSO 4 : 0.25g / l; the salt nitrate workshop produces 10t of industrial salt and 0.7t of industrial sodium sulfate as a by-product, so the purification workshop needs to process 35.7m 3Glauber's salt-type brine, first-order reaction, add 34.1kg CaO at a stirring speed of 20-100r / min, continue to stir and react for 5 hours, then add 0.07kg of a first-class flocculant, stop stirring for 2 hours, and measure the Mg in the clear liquid 2+ and pH va...

Embodiment 2

[0040] The composition of Glauber's salt brine is: H 2 O: 881.4g / l; NaCl: 295 g / l; Na 2 SO 4 : 22g / l; CaSO 4 : 1.4g / l; MgSO 4 : 0.22g / l; the salt nitrate workshop produces 10t of industrial salt and 0.7t of industrial sodium sulfate as a by-product, so the purification workshop needs to process 35.7m 3 Glauber's salt-type brine, in the primary reaction, add 33.6 kg of CaO at a continuous stirring speed of 20 to 100 r / min, and ensure that the residence time is more than 5 hours, transfer to the primary clarification equipment, and add 0.07 kg of primary flocculant at the same time, measure the Mg 2+ and PH values ​​are 0.1ppm and 12.5 respectively; the clear liquid from the primary clarification equipment is transferred to the secondary reaction barrel, and the secondary reaction is fed into the flue gas 149Nm at a continuous stirring speed of 20-100r / min 3 , and add 10.1kg of soda ash, and ensure that the residence time is more than 2 hours, transfer to the secondary clar...

Embodiment 3

[0042] The composition of Glauber's salt brine is: H 2 O: 891g / l; NaCl: 290g / l; Na 2 SO 4 : 16.8g / l; CaSO 4 : 2.04g / l; MgSO 4 : 0.25g / l; if the salt nitrate workshop produces 10t of industrial salt, the purification workshop needs to process 36.1m 3 Glauber's salt-type brine, while reducing the production of industrial sodium sulfate in the salt nitrate workshop, using the salt nitrate workshop to return 9.4 m 3 The salt nitrate mother liquor is mixed with it, thereby reducing the output of sodium sulfate in the salt nitrate workshop. Glauber's salt-type brine and salt salt mother liquor are mixed in the first-stage reaction, and 42.8kg CaO is added at a stirring speed of 20-100r / min to continue stirring and reacting for 5 hours. Mg 2+ and pH values ​​are 0.1ppm and 12.5 respectively; transfer the first-stage clear liquid to the second-stage reaction, and the second-stage reaction is passed into the flue gas 219Nm at a stirring speed of 20-100r / min 3 , continue to stir ...

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Abstract

The invention discloses a purifying process of mirabilite type brine by adopting a lime-carbon dioxide process. The purifying process comprises the following process steps of: (A) preparing lime milk; (B) preparing a first-order flocculant solution; (C) carrying out first-order reaction; (D) preparing carbon dioxide; (E) preparing sodium carbonate suspension; (F) preparing a second-order flocculant solution; and (G) carrying out a second-order reaction. The purifying process of the mirabilite type brine by adopting the lime-carbon dioxide process disclosed by the invention can be used for removing Ca<2+> and Mg<2+> in the mirabilite type brine by utilizing carbon dioxide in quick lime and flue gas and lowering the purifying cost of the mirabilite type brine manufacturing enterprises. Meanwhile, the carbon dioxide discharge value of a thermal power plant or a boiler room is reduced, so that a novel process method for purifying the mirabilite type brine is provided.

Description

technical field [0001] The invention belongs to the field of brine purification, in particular to lime-carbon dioxide method for removing Ca in mirabilite-type brine 2+ and Mg 2+ Methods. Background technique [0002] Use Glauber's salt brine for salt and salt co-production 2 In addition to O, it mainly contains NaCl (content range between 250 ~ 310 g / l), followed by NaCl 2 SO 4 (content range between 1 ~ 50 g / l) trace compound is CaSO 4 (The content range is between 0~6g / l) and MgSO 4 (The content range is between 0~2g / l). Ca in Glauber's Salt Type Brine 2+ CaSO is formed during evaporation 4 Affect product quality, while Mg 2+ During the evaporation process, the boiling point of the solution will be increased, which not only greatly reduces the heat transfer efficiency, but also leads to frequent cleaning of the heating tube, which affects the effective production time of the system and affects the product quality. [0003] Energy conservation and emission reduct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/06C01D5/00
Inventor 杨茂盛林卫张剑军刘涛陈伯祥
Owner CHINA CEC ENG
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