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Lime-sodium sulfate-carbon dioxide method used for purifying calcium chloride type bittern

A calcium chloride type brine and carbon dioxide technology, applied in the direction of alkali metal chlorides, etc., can solve the problems of increasing the cost of brine purification, wasting resources, and short brushing cycles, and achieves reduction of purification costs and steam consumption, and carbon dioxide emissions. The effect of quantity and long production cycle

Active Publication Date: 2014-01-01
CHINA CEC ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The traditional chemical purification method of calcium chloride-type brine adopts the "caustic soda" method to remove Mg in calcium chloride-type brine 2+ , leading to evaporation salt production can only use "gypsum seed crystal method", the enriched Ca 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 product quality is low, and the cleaning cycle is short
At the same time, due to the sharp increase in domestic caustic soda prices in recent years, the cost of brine purification has been greatly increased.

Method used

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  • Lime-sodium sulfate-carbon dioxide method used for purifying calcium chloride type bittern
  • Lime-sodium sulfate-carbon dioxide method used for purifying calcium chloride type bittern

Examples

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Embodiment 1

[0033] The composition of calcium chloride type brine is: H 2 O: 885.7g / l; NaCl: 310 g / l; CaCl 2 : 2.56 g / l; CaSO 4 : 1.61g / l; MgCl 2 : 0.23 g / l; if the salt workshop produces 10t of industrial salt, the purification workshop needs to process 32.8m 3 Calcium chloride type brine and 27.5m 3 Mother liquor for salt production, primary reaction, first add 147.2kg of Na at 20-100r / min stirring speed 2 SO 4 , then add 56.5kg CaO and continue to stir the reaction 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 values ​​are 0.1ppm and 12.5 respectively; transfer the primary clear liquid to the secondary reaction, and the secondary reaction is passed into the flue gas 298Nm at a stirring speed of 20-100r / min 3, continue to stir, add 0.12kg of secondary flocculant after 2 hours, stop stirring and clarify for 2 hours, measure the Ca in the clear liquid 2+ , Mg 2+ and pH value are 4ppm, 0.1ppm ...

Embodiment 2

[0035] The composition of calcium chloride type brine is: H 2 O: 885.2g / l; NaCl: 300 g / l; CaCl 2 : 10.51 g / l; CaSO 4 : 1.91g / l; MgCl 2 : 2.38 g / l; if the salt workshop produces 10t of industrial salt, the purification workshop needs to process 33.7m 3 Calcium chloride type brine and 25.6m 3 Mother liquor for salt production, primary reaction Add 598.9kg of Na at a stirring speed of 20-100r / min 2 SO 4 , then add 99.5kg 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 of the primary clarification equipment is transferred to the secondary reaction barrel, and the secondary reaction is fed with carbon dioxide 302Nm 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 clarificatio...

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Abstract

The invention discloses a lime-sodium sulfate-carbon dioxide method used for purifying calcium chloride type bittern. The lime-sodium sulfate-carbon dioxide method comprises following steps: (A) preparation of lime milk; (B) preparation of sodium sulfate suspension; (C) preparation of a first order flocculating agent solution; (D) first-order reaction; (E) preparation of carbon dioxide; (F) preparation of a second order flocculating agent solution; and (G) second-order reaction. According to the lime-sodium sulfate-carbon dioxide method, quicklime and carbon dioxide in flue gas are used for removing Ca<2+> and Mg <2-> in calcium chloride type bittern, so as to reduce purification cost of enterprises producing calcium chloride type bittern, reduce carbon dioxide discharge capacity of thermal power plants or boiler plants, and provide novel technological methods for purification of calcium chloride type bittern.

Description

technical field [0001] The invention belongs to calcium chloride type brine purification technology, in particular to lime-sodium sulfate-carbon dioxide method for removing Ca in calcium chloride type brine 2+ and Mg 2+ Methods. Background technique [0002] Calcium chloride brine is used for salt production. In the calcium chloride brine used by salt-making enterprises, H 2 In addition to O, it mainly contains NaCl (the content range is between 250 ~ 310 g / l), followed by CaCl 2 (the content range is between 0 and 20 g / l), and the trace compound is CaSO 4 (The content range is between 0~3g / l) and MgCl 2 (The content range is between 0~5g / l). Ca in Calcium Chloride Type Brine 2+ CaSO is generated during evaporative salt production 4 Affect product quality, while Mg 2+ and Ca 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 he...

Claims

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Application Information

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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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