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Method and device for crystallizing lead plaster desulphurization by-product sodium sulfate based on localized cooling and rapid crystal precipitation

A desulfurization by-product, cooling crystallization technology, applied in chemical instruments and methods, alkali metal sulfite/sulfite, alkali metal compounds, etc., can solve product scaling and scarring, reduce evaporation efficiency, equipment pipeline blockage, etc. problems, achieve stable operation, overcome high energy consumption, and low energy consumption

Active Publication Date: 2015-06-24
XIANGTAN UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the method of recycling sodium sulfate solution in industrial waste water at home and abroad is mainly heating, evaporating and crystallizing, but this method consumes a lot of energy, and the product is easy to scale and scar in the crystallizer so that the evaporation efficiency is reduced and the equipment pipeline may be blocked. Although many Efficient evaporation can reduce energy consumption, but the problem of scaling and scarring is still common in actual production

Method used

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  • Method and device for crystallizing lead plaster desulphurization by-product sodium sulfate based on localized cooling and rapid crystal precipitation
  • Method and device for crystallizing lead plaster desulphurization by-product sodium sulfate based on localized cooling and rapid crystal precipitation

Examples

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Effect test

Embodiment 1

[0023] Such as figure 2 As shown, inject 400kg of sodium sulfate solution (mass fraction: 25%) into the solution storage tank 1 (Φ0.6m, height 0.8m), the temperature of the sodium sulfate solution is 25°C at room temperature, and the refrigeration system is turned on to input refrigerant to the cooling crystallizer 3 , turn on the circulation pump 2, the sodium sulfate solution is pumped into the cooling crystallizer 3 through the outlet 101, the flow rate of the circulation pump 2 is 50L / h, the cooling crystallizer 3 includes a gravity settler 301 and a central column pipe 302, and the refrigerant inlet 305 is adjusted The refrigerant at the outlet 306 of the cooling medium makes the temperature of the dilute phase at the upper outlet 303 of the cooling crystallizer 5°C, and the dilute phase at the upper outlet 303 of the cooling crystallizer returns to the storage tank 1 and brings the refrigerant into the solution in the storage tank 1 to gradually cool down the temperature...

Embodiment 2

[0025] Such as figure 2 As shown, inject 400kg of sodium sulfate solution (mass fraction: 28%) into the solution storage tank 1 (Φ0.6m, height 0.8m), the temperature of the sodium sulfate solution is 20°C, turn on the refrigeration system and input refrigerant to the cooling crystallizer 3, Open circulation pump 2, sodium sulfate solution is pumped in cooling crystallizer 3 through outlet 101, and the flow rate of circulation pump 2 is 50L / h, and cooling crystallizer 3 comprises gravity settler 301 and central column pipe 302, regulates refrigerant inlet 305 and The refrigerant at the refrigerant outlet 306 makes the temperature of the dilute phase at the upper outlet 303 of the cooling crystallizer 0°C, and the dilute phase at the upper outlet 303 of the cooling crystallizer returns to the storage tank 1 and brings the refrigerant into the solution in the storage tank 1 to gradually cool down, and the cooling crystallizer 3 The slurry with 47% dense phase at the bottom enter...

Embodiment 3

[0027] Such as figure 2 As shown, inject 400kg of sodium sulfate solution (mass fraction: 20%) into the solution storage tank 1 (Φ0.6m, height 0.8m), the temperature of the sodium sulfate solution is 25°C at room temperature, and the refrigeration system is turned on to input refrigerant to the cooling crystallizer 3 , turn on the circulation pump 2, the sodium sulfate solution is pumped into the cooling crystallizer 3 through the outlet 101, the flow rate of the circulation pump 2 is 50L / h, the cooling crystallizer 3 includes a gravity settler 301 and a central column pipe 302, and the refrigerant inlet 305 is adjusted The refrigerant at the outlet 306 of the cooling medium makes the temperature of the dilute phase at the upper outlet 303 of the cooling crystallizer 3°C, and the dilute phase at the upper outlet 303 of the cooling crystallizer returns to the storage tank 1 and brings the refrigerant into the solution in the storage tank 1 to gradually cool down the tempera...

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Abstract

The invention discloses a method and a device for crystallizing a lead plaster desulphurization by-product sodium sulfate based on localized cooling and rapid crystal precipitation. A sodium sulfate solution is stored in a storage tank, and conveyed to a cooling crystallizer by a circulating pump; because the cooling crystallizer concurrently has the functions of cooling and solid-liquid separation, the sodium sulfate solution in the cooling crystallizer is rapidly deeply cooled to 0-10 DEG C under the action of a refrigerant; sodium sulfate is precipitated out in a sodium sulfate decahydrate crystal form, precipitated crystals are separated out in the cooling crystallizer, a concentrated phase with a solid content of 30-70% enters a centrifuge so as to obtain sodium sulfate decahydrate crystals, and a dilute phase obtained by the centrifuge returns to a production system to be used as system make-up water; and a dilute phase separated by the cooling crystallizer returns to the sodium sulfate solution storage tank, and the refrigerant is also brought into the storage tank, so that the solution in the storage tank is integrally gradually cooled. A localized cooling and rapid crystal precipitation method provided by the invention is high in energy utilization rate, high in product precipitation rate, continuously running, and simple and reliable in system.

Description

technical field [0001] The invention relates to a method for crystallizing sodium sulfate, in particular to a method and a device for crystallizing sodium sulfate by-product of pre-desulfurization of waste lead-acid storage battery lead paste. Background technique [0002] The lead paste wet desulfurization process is to add sodium carbonate to the lead paste slurry to convert lead sulfate into lead carbonate. After the desulfurized lead paste is filtered, lead carbonate filter cake and sodium sulfate filtrate are obtained. The lead carbonate filter cake is recovered by pyromelting Metallic lead and sodium sulfate solution need to be purified and recovered. [0003] At present, the method of recycling sodium sulfate solution in industrial waste water at home and abroad is mainly heating, evaporating and crystallizing, but this method consumes a lot of energy, and the product is easy to scale and scar in the crystallizer so that the evaporation efficiency is reduced and the e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/00
Inventor 张俊丰刘磊曹靖吴光辉王振云范伟宋巍
Owner XIANGTAN UNIV
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