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Recycling method for high-nitre brine in transferring and mining course of mirabilite wells

A technology of nitric brine and nitric acid, applied in the direction of alkali metal halide purification, calcium/strontium/barium sulfate, etc., can solve the problems of loss, inability, waste of resources and other economic problems, and achieve high added value, high whiteness, particle size, etc. uniform effect

Inactive Publication Date: 2019-01-04
CHINA PETROCHEMICAL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of changing mirabilite wells to mining, the sodium chloride content in the produced nitric water is 250g / L, and the sodium sulfate is higher than 25g / L. The use of raw materials in the salt or chlor-alkali industry has become an unusable nitric brine
However, the well group invests millions of yuan, and shutting down will cause waste of resources and economic losses

Method used

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  • Recycling method for high-nitre brine in transferring and mining course of mirabilite wells

Examples

Experimental program
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Effect test

Embodiment 1

[0019] A kind of recovery and utilization method of high nitric acid brine in the conversion process of Glauber's salt well, the steps are as follows:

[0020] 1) Pretreatment of high nitrate brine: Connect the brine return pipeline of the transfer well to the nitrate pretreatment tank, and use raw material nitrate or brine to adjust the nitrate in the nitrate pretreatment tank, so that the tank The composition of the liquid phase is stable within the range of sodium chloride 275g / L, sodium sulfate 55g / L, and density 1215g / L, and the process of sedimentation and impurity removal is completed at the same time;

[0021] 2) Chemical synthesis process: The nitric water and concentrated calcium solution obtained in step 1) are pumped into the compounding tank at a molar ratio of 1:1.1, and the stirring speed is 110r / min, and the reaction produces precipitated calcium sulfate and clear liquid chlorine Sodium chloride, by controlling the addition rate, stirring speed and residence ti...

Embodiment 2

[0026] A kind of recovery and utilization method of high nitric acid brine in the conversion process of Glauber's salt well, the steps are as follows:

[0027] 1) Pretreatment of high nitrate brine: Connect the brine return pipeline of the transfer well to the nitrate pretreatment tank, and use raw material nitrate or brine to adjust the nitrate in the nitrate pretreatment tank, so that the tank The composition of the liquid phase is stable within the range of sodium chloride 280g / L, sodium sulfate 60g / L, and density 1220g / L, and the process of sedimentation and impurity removal is completed at the same time;

[0028] 2) Chemical synthesis process: The nitric water and concentrated calcium solution obtained in step 1) are pumped into the compounding tank according to the molar ratio of 1:1.2, and the stirring speed is 120r / min, and the reaction produces precipitated calcium sulfate and clear liquid chlorine Sodium chloride, by controlling the addition rate, stirring speed and ...

Embodiment 3

[0033] A kind of recovery and utilization method of high nitric acid brine in the conversion process of Glauber's salt well, the steps are as follows:

[0034] 1) Pretreatment of high nitrate brine: Connect the brine return pipeline of the transfer well to the nitrate pretreatment tank, and use raw material nitrate or brine to adjust the nitrate in the nitrate pretreatment tank, so that the tank The composition of the liquid phase is stable within the range of sodium chloride 285g / L, sodium sulfate 65g / L, and density 1225g / L, and the process of sedimentation and impurity removal is completed at the same time;

[0035] 2) Chemical synthesis process: The nitric water and concentrated calcium solution obtained in step 1) are pumped into the compounding tank according to the molar ratio of 1:1.3, and the stirring speed is 130r / min, and the reaction produces precipitated calcium sulfate and clear liquid chlorine Sodium chloride, by controlling the addition rate, stirring speed and ...

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Abstract

The invention discloses a recycling method for high-nitre brine in the transferring and mining course of mirabilite wells. The method comprises the following steps: (1) pretreating high-nitre brine; (2) performing a chemical synthesis course; (3) performing filtration and separation; (4) performing multi-stage washing; and (5) blending plaster pulp. According to the method disclosed by the invention, the high-nitre brine is used as a raw material and have a combination reaction with a calcium chloride solution to generate precipitate calcium sulfate and high-purity brine, the precipitate calcium sulfate is washed to be prepared into pulp to be used as a raw material of plaster products and a raw material for producing inorganic fiber crystal whiskers, and liquid phase brine can be used asraw materials of vacuum salt manufacturing and alkali manufacturing trade; the whole course is a treatment solution of the high-nitre brine in the transferring and mining project of the mirabilite wells, the comprehensive utilization that the high-nitre brine is converted into the high-purity brine can be realized, besides, calcium sulphate dihydrate slurry which can be used as raw materials for producing inorganic fiber materials having high added value can be produced.

Description

technical field [0001] The invention relates to a method for reusing inorganic salt mineral resources, in particular to a method for reusing high-nitrate brine during the conversion of Glauber's salt wells. Background technique [0002] It is a common practice for comprehensive utilization of underground thenardite resources to mine anhydrous thenardite located 2,000 meters underground by using the water-soluble drilling method. However, due to the nature of the mineral deposit is a symbiotic and associated mine of thenardite salt, there are currently short stable production periods in the operation of the thenardite well, and the quality of the saltwater drops rapidly. Features. In the middle and late stage of mining, the nitrate salt will appear upside down in the extracted nitrate water composition. From the analysis of the phase diagram of the water-salt system, if the sodium sulfate content in the produced nitric water is less than 80g / L, and the sodium chloride conten...

Claims

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Application Information

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IPC IPC(8): C01D3/14C01F11/46
CPCC01D3/14C01F11/46
Inventor 廉颖徐卫华宫维龚琦张为之陶欣陈明王志明吕红梅
Owner CHINA PETROCHEMICAL CORP
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