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Low-sulfur large-grained salt produced from sodium sulfate type salt mine and preparation method thereof

A sodium sulfate, large-grain technology, applied in the direction of calcium/strontium/barium halides, alkali metal chlorides, calcium/strontium/barium chlorides, etc., can solve the problem of small footprint, short process flow, and no multiple effects Evaporate salt production process and other issues to achieve the effect of reducing waste residue discharge, saving electric energy and increasing sales radius

Active Publication Date: 2014-09-03
江苏苏盐井神股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The MVR salt production process has a short process flow and does not have multiple evaporation tanks, vacuum systems, circulating cooling water systems, salt transfer systems, etc. of the multi-effect evaporation salt production process, and occupies a relatively small area, with energy and water saving effects. Obviously, there are no waste gas, waste residue, waste water discharge and other advantages, and it has been widely used at home and abroad, but the raw material brine used is not high-calcium brine

Method used

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  • Low-sulfur large-grained salt produced from sodium sulfate type salt mine and preparation method thereof
  • Low-sulfur large-grained salt produced from sodium sulfate type salt mine and preparation method thereof
  • Low-sulfur large-grained salt produced from sodium sulfate type salt mine and preparation method thereof

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preparation example Construction

[0057] The preparation process of low-sulfur large-grain salt includes: mixing ammonia-soda waste liquid with water and injecting it into sodium sulfate type salt mine for underground desulfurization, producing calcium chloride content of 40-120g / L and magnesium content of 0g / L, calcium sulfate content 0.2 ~ 1.5g / L, high calcium brine saturated with sodium chloride. The calcium chloride content of the high-calcium brine is preferably 50-115 g / L, more preferably 60-110 g / L, and most preferably 70-100 g / L. The content of calcium sulfate in high-calcium brine is preferably 0.5-1.5 g / L, more preferably 0.4-1.0 g / L, and most preferably 0.2-0.5 g / L. The mixing ratio of ammonia-alkali waste liquid and water is ammonia-alkali waste liquid:water (volume)=1:0.1-2, preferably 1:0.1-1, more preferably 1:0.1-0.5, most preferably 1:0.2. . The high-calcium brine is preheated to 50°C by heat exchange with secondary steam (primary preheating) and / or condensed water (secondary preheating) re...

Embodiment 1

[0067]1. Ammonia-alkali waste liquid and water are blended according to the volume ratio of ammonia-alkali waste liquid: water=1:0.2 and injected into sodium sulfate type salt mine for underground desulfurization. The production calcium chloride content is 60g / L and the magnesium content is 0g / L L. Calcium sulfate content 1.2g / L, high calcium brine saturated with sodium chloride, after heat exchange with secondary steam (first-level preheating) and condensed water (secondary preheating) through the pump (high-calcium brine temperature rise to about 50°C) into the four-effect brine concentration system (multi-effect forced circulation evaporator) through the feeding pump, and the concentrated suspension is sent to the cyclone for solid-liquid separation through the salt slurry pump, and the bottom flow returns to the raw brine tank. The top flow enters the first-stage MVR evaporation salt production process through the pump, the salt slurry evaporated and concentrated by the fir...

Embodiment 2

[0077] 1. Ammonia-alkali waste liquid and water are blended according to the volume ratio of ammonia-alkali waste liquid: water=1:0.1 and injected into sodium sulfate type salt mine for underground desulfurization, producing calcium chloride content of 80g / L and magnesium content of 0g / L L. High-calcium brine with a calcium sulfate content of 0.6g / L and saturated with sodium chloride is pumped through the pump to exchange heat with secondary steam (first-stage preheating) and condensed water (secondary preheating), and then pumped into the Four-effect brine concentration system, the concentrated suspension is transported to the cyclone by the salt slurry pump for solid-liquid separation, the bottom flow is returned to the raw brine tank, the top flow is pumped into the first-stage MVR evaporation salt production process, and the first-stage MVR The salt slurry concentrated by salt evaporation is separated from solid and liquid by a cyclone, and the underflow salt slurry is then...

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Abstract

The invention relates to a low-sulfur large-grained salt produced from sodium sulfate type salt mine and a preparation method thereof. Liquid calcium from ammonia alkali factory is blended with water and injected into sodium sulfate type salt mine for underground desulfurization to form high calcium brine, and the high calcium brine as a raw material is subjected to salt calcium coproduction to produce low-sulfur large-grained salt by using an MVR (mechanical vapor recompression) evaporator with a crystal cultivation baffling cylinder and a unique production process. The product comprises not less than 99.50% of sodium chloride (dry basis), no more than 0.2% of sulfate radical, more than 70% of granularity greater than 0.4 mm, and no more than 1% of granularity less than 0.15 mm; the product does not contain any anti-caking agent, and has anti-caking period more than 4 months, so as to meet the needs of industrial production turnover.

Description

technical field [0001] The invention belongs to the technical fields of sodium sulfate type salt mine mining, mechanical thermal compression energy saving and emission reduction, and production of low-sulfur large-grain salt, and specifically relates to a low-sulfur large-grain salt produced from sodium sulfate-type salt mine and a production method thereof. Background technique [0002] Industrial salt is mainly used as raw material for production of soda ash and chlor-alkali enterprises. The production of soda ash requires the lower the sulfate radical of the raw material salt, the better, and there is no requirement for potassium ferrocyanide anticaking agent. Chlor-alkali enterprises' "Ionic membrane caustic soda process operating procedures" generally require that the sulfate radical in the electrolytic brine should be less than 5g / L, and potassium ferrocyanide anticaking agent should not be added to the raw salt as much as possible. [0003] The documents "Analysis on...

Claims

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Application Information

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IPC IPC(8): C01D3/08C01F11/24
Inventor 戴克洋王桂春周兵陈洪仇耀军刘春华郑仲军
Owner 江苏苏盐井神股份有限公司
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