A kind of method for preparing high-concentration magnesium chloride solution by continuous dissolving of bischofite in salt lake

Abstract

The invention relates to the technical field of salt chemistry, particularly relates to a method of continuous dissolution of salt lake bischofite to prepare a high-concentration magnesium chloride solution, to a production device for achieving a process of large-scale bischofite dissolution to prepare refined brine, and provides a industrial demonstration effect route for developing magnesium series oxides in the Qinghai salt lake in the future. The method includes steps of: unloading bischofite, conveying and loading the material by conveying belts, feeding, dissolving into brine, allowing crude brine to overflow, performing magnesium chloride fine grain separation, buffering the brine, thickening and depositing the brine, obtaining a first-step clear liquid, subjecting the first-step clear liquid to first-step filter pressing, obtaining a second-step clear liquid, subjecting the second-step clear liquid to second-step filter pressing, squeezing and filtering the bottom material of a thickening machine, conveying mud cake, subjecting the brine to accident handling, and conveying and storing the refined brine so as to obtain the brine with technical indexes meeting requirements of ammonia gas combined reactions. The concentration of Mg<2+> in the refined brine is 115+ / -3 g / L. The refined brine is clear, transparent and free of solid suspension impurities.

Description

technical field

[0001] The present invention relates to the technical field of salt chemical industry, in particular to a method for producing high-concentration magnesium chloride solution by continuous dissolving of bischofite in salt lakes, a production device for realizing the process of preparing refined brine by large-scale industrial dissolving of bischofite, and for the future development of Qinghai Salt lake magnesium series oxides provide a way to demonstrate the effect of industrialization. Background technique

[0002] The old brine discharged from the Qinghai Salt Lake after potassium extraction, through the local unique natural evaporation, enriches around the salt lake, forming bischofolite salt deposits. At present, the proven reserves of bischofolite salt deposits reach 6.5 billion tons, accounting for the More than 99% of the reserves are maintained, ranking first in the country. However, magnesium resources and potassium resources in salt lakes are closel...

Examples

Embodiment 1

[0068] After several years of industrial test research and continuous improvement and optimization of the process in the long-term practice process, the present invention has now summed up a method for preparing a high-concentration magnesium chloride solution by continuously dissolving bischnite in salt lakes. The research process over the past few years is listed as follows:

[0069] From October 2006 to October 2009, when the 5,000 tons / year high-purity magnesium hydroxide industrial test device in the Xitieshan test workshop was in operation, the dissolution of bischofite in the brine preparation process used a concrete-lined glass fiber reinforced plastic dissolution tank. Compressed air was used to stir and dissolve.

[0070] After the car transports the raw bischofite to the workshop, it is directly poured into the dissolution tank, then water is added, and then stirred with compressed air regularly or irregularly. Although this method reduces the labor intensity of wo...

technical field

[0001] The present invention relates to the technical field of salt chemical industry, in particular to a method for producing high-concentration magnesium chloride solution by continuous dissolving of bischofite in salt lakes, a production device for realizing the process of preparing refined brine by large-scale industrial dissolving of bischofite, and for the future development of Qinghai Salt lake magnesium series oxides provide a way to demonstrate the effect of industrialization. Background technique

[0002] The old brine discharged from the Qinghai Salt Lake after potassium extraction, through the local unique natural evaporation, enriches around the salt lake, forming bischofolite salt deposits. At present, the proven reserves of bischofolite salt deposits reach 6.5 billion tons, accounting for the More than 99% of the reserves are maintained, ranking first in the country. However, magnesium resources and potassium resources in salt lakes are closel...

Examples

Embodiment 1

[0068] After several years of industrial test research and continuous improvement and optimization of the process in the long-term practice process, the present invention has now summed up a method for preparing a high-concentration magnesium chloride solution by continuously dissolving bischnite in salt lakes. The research process over the past few years is listed as follows:

[0069] From October 2006 to October 2009, when the 5,000 tons / year high-purity magnesium hydroxide industrial test device in the Xitieshan test workshop was in operation, the dissolution of bischofite in the brine preparation process used a concrete-lined glass fiber reinforced plastic dissolution tank. Compressed air was used to stir and dissolve.

[0070] After the car transports the raw bischofite to the workshop, it is directly poured into the dissolution tank, then water is added, and then stirred with compressed air regularly or irregularly. Although this method reduces the labor intensity of wo...

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