Method for recovering sulfate radicals from dechlorinated light salt brine to prepare anhydrous sodium sulfate

A technology of anhydrous mirabilite and light salt water, applied in alkali metal sulfite/sulfate dehydration, chemical instruments and methods, alkali metal sulfite/sulfite, etc., can solve the problem of large investment, large space occupation, equipment Corrosion and other problems, to achieve the effect of solving large steam consumption, saving steam consumption and preventing equipment corrosion

Inactive Publication Date: 2012-06-27
YIBIN TIANYUAN GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology allows for combining two processes together - one involves concentrating ammonia gas into liquid form before it can be used effectively without wasting materials such as calcium carbonate. Additionally, another new approach called heat-meltered salt has been developed where different types of solids like potassium chloride were mixed with each other during solidification. By doing both these techniques, there will also reduce material usage and improve productivity compared to traditional methods.

Problems solved by technology

Technological Problem addressed in this patents relates to improving the economics and effectiveness of producing alkyl ammonia hydroxide solutions through decomposition reactions between different substances like calcium cations and magnesium cations. Current processes involve expensive purifying techniques involving multiple stages of physical removal and evacuating beforehand, leading to increased costs associated therewith.

Method used

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  • Method for recovering sulfate radicals from dechlorinated light salt brine to prepare anhydrous sodium sulfate
  • Method for recovering sulfate radicals from dechlorinated light salt brine to prepare anhydrous sodium sulfate

Examples

Experimental program
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Embodiment 1

[0022] Such as figure 1 Shown, a kind of method that reclaims sulfate radical to produce anhydrous Glauber's salt from dechlorinated light brine comprises the following steps:

[0023] (1) Dilute dechlorinated light brine (NaCl: 200g / l; Na 2 SO 4 :8 g / l; Ca 2+ +Mg 2+ : 80ppm; NaClO: 0.08 ppm; NaCLO 3 : 8 g / l carries out membrane concentration, obtains concentrate, and the membrane adopted is nanofiltration membrane;

[0024] (2) Freezing and crystallizing the concentrated solution obtained in step (1), and centrifuging to obtain Glauber's salt;

[0025] (3) Put the Glauber's salt obtained in step (2) into the Glauber's salt heating circulation storage tank and add water to the upper circulation port, then heat and circulate through the heater through the circulation pump, and control the water temperature at 40°C. The conveying pump pumps the circulating liquid into the sodium sulfate decahydrate settling tank to settle, and starts the centrifuge to obtain the anhydrous ...

Embodiment 2

[0029] In this embodiment, the thermal melting temperature is controlled to be 50° C., and the rest are the same as in Embodiment 1. The production of 1 ton of anhydrous Glauber’s salt in this embodiment consumes 0.32 tons of steam in total.

Embodiment 3

[0031] In this embodiment, the thermal melting temperature is controlled to be 99° C., and the rest is the same as in the embodiment. The production of 1 ton of anhydrous Glauber’s salt in this embodiment consumes 0.4 tons of steam in total.

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Abstract

The invention discloses a method for recovering sulfate radicals from dechlorinated light salt brine to prepare anhydrous sodium sulfate, comprising the following steps: carrying out membrane concentration on dechlorinated light salt brine to obtain a concentrated solution, carrying out freezing crystallization on the concentrated solution, carrying out centrifugation to obtain sodium sulfate, fusing sodium sulfate through heating at 35-99 DEG C, one letting part of sodium sulfate precipitate crystals in the form of anhydrous salt, carrying out centrifugation and drying on the crystals to obtain an anhydrous sodium sulfate product, and letting the other part of sodium sulfate dissolve in its own crystal water to form a saturated sodium sulfate solution. According to the invention, the energy consumption is greatly reduced, the corrosion to the devices is prevented, the environmental pollution is reduced, and simultaneously the production efficiency is greatly raised.

Description

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Claims

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Application Information

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Owner YIBIN TIANYUAN GRP CO LTD
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