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Gypsum type brine purification technique using lime-carbon dioxide method

A carbon dioxide and brine purification technology, applied in the direction of alkali metal chloride, etc., can solve the problems of wasting heat energy of salt-making mother liquor, high energy consumption of evaporation, and short brushing cycle, so as to reduce steam consumption, low steam consumption, and short production cycle long effect

Inactive Publication Date: 2013-09-11
CHINA CEC ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The traditional gypsum-type brine is not purified, and the "gypsum seed crystal method" is used for salt production, and the enriched Ca 2+ and Mg 2+ By discharging the salt-making mother liquor, it is a waste of resources and the heat energy taken away by the salt-making mother liquor, and the evaporation energy consumption is high, the product quality is low, and the cleaning cycle is short

Method used

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  • Gypsum type brine purification technique using lime-carbon dioxide method
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  • Gypsum type brine purification technique using lime-carbon dioxide method

Examples

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Embodiment 1

[0037] Embodiment 1 adopts attached figure 1 The intermittent gypsum type type brine purification process; Embodiment 2 adopts the attached figure 2 Continuous gypsum type brine purification process; Embodiment 3 adopts the attached image 3 The intermittent gypsum type brine purification process; Embodiment 4 adopts the attached Figure 4 Continuous gypsum type brine purification process.

[0038] Example 1:

[0039] The composition of gypsum brine is: H 2 O: 882.7g / l; NaCl: 310 g / l; CaSO 4 : 4.52g / l; CaCl2 : 2.25 g / l; MgCl 2 : 0.44g / l; if the salt workshop produces 10t of industrial salt, the purification workshop needs to process 32.8m 3 gypsum brine and 26.3m 3 Mother liquor for salt production, primary reaction, first add 140.1kg of Na at a stirring speed of 20-100r / min 2 SO 4 , then add 60kg CaO and continue to stir and react for 5 hours, then add 0.12kg of primary flocculant, stop stirring and clarify for 2 hours, measure the Mg in the clear liquid 2+ and PH ...

Embodiment 2

[0041] The composition of gypsum brine is: H 2 O: 882.6g / l; NaCl: 310 g / l; CaSO 4 : 4.50g / l; CaCl 2 : 2.25 g / l; MgCl 2 : 0.44g / l; if the salt workshop produces 10t of industrial salt, the purification workshop needs to process 32.9m 3 gypsum brine and 26.2m 3 Mother liquor for salt production, primary reaction Add 141.5kg of Na at a continuous stirring speed of 20-100r / min 2 SO 4 , and then add 62kg CaO, and ensure that the residence time is more than 5 hours, transfer to the primary clarification equipment, and add 0.12kg of primary flocculant at the same time, measure the Mg in the clear liquid 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 295Nm at a continuous stirring speed of 20-100r / min. 3 , and ensure that the residence time is more than 2 hours, transfer to the secondary clarification equipment, add ...

Embodiment 3

[0043] The composition of gypsum brine is: H 2 O: 904.2g / l; NaCl: 292g / l; CaSO 4 : 3.13g / l; CaCl 2 : 0.66 g / l; MgCl 2 : 0.44g / l; if the salt workshop produces 10t of industrial salt, the purification workshop needs to process 36m 3 gypsum brine and 9.7m 3 Mother liquor for salt production, primary reaction Add 48.9kg of CaO at a stirring speed of 20-100r / min, continue stirring for 5 hours, then add 0.09kg of primary flocculant, stop stirring for 2 hours, and measure the Mg in the clear liquid 2+ and PH values ​​are 0.1ppm and 12.5 respectively; transfer the primary clear liquid to the secondary reaction, and the secondary reaction is fed into the flue gas 225Nm at a stirring speed of 20-100r / min 3 , continue to stir, add 63.5kg of sodium carbonate after 2 hours, add 0.09kg of secondary flocculant after continuing to stir for 2 hours, stop stirring for clarification for 2 hours, measure the Ca in the clear liquid 2+ , Mg 2+ And the pH value is 4.8ppm, 0.1ppm and 11 respec...

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Abstract

The invention discloses a gypsum type brine purification technique using a lime-carbon dioxide method. The technique comprises the following technical steps of: (A) preparation of lime milk; (B) preparation of a sodium sulfate suspension liquid; (C) preparation of a first-stage flocculant solution; (D) first-stage reaction; (E) preparation of carbon dioxide; (F) preparation of a sodium carbonate suspension liquid; (G) preparation of a second-stage flocculant solution; and (H) second-stage reaction. According to the gypsum type brine purification technique disclosed by the invention, quick lime and carbon dioxide in flue gas are utilized to remove Ca<2+> and Mg<2+> from gypsum calcium type brine, so that the purification cost of gypsum calcium type brine production enterprises is lowered, simultaneously emission of carbon dioxide from a steam power plant or a boiler room is reduced, and a new process for purification of gypsum calcium type brine is provided.

Description

technical field [0001] The invention belongs to the field of gypsum-type brine purification, in particular to lime-carbon dioxide method for removing Ca in gypsum-type brine 2+ and Mg 2+ Methods. Background technique [0002] In the gypsum-type brine used by salt-making enterprises, the removal of H 2 In addition to O, it mainly contains NaCl (content range between 250 ~ 310 g / l), followed by CaSO 4 (The content range is between 0~6g / l), trace compound CaCl 2 (content range between 0~2g / l) is and MgCl 2 (The content range is between 0~5g / l). Ca in gypsum brine 2+ CaSO is generated during evaporative salt production 4 Affect product quality, while Mg 2+ and CaCl 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] Ener...

Claims

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Application Information

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