Method for removing magnesium ion and calcium ion in middle-degree brine in salt-field

A technology of calcium ion and magnesium ion, which is applied in the direction of alkali metal chloride, etc., can solve the problems of low brine formation and salt production, and reduced brine evaporation intensity, so as to improve salt quality, reduce crystallization area, and reduce evaporation resistance. Effect

Inactive Publication Date: 2008-03-12
ENG TECH INST CO LTD OF CNSIC
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Furthermore, in the process of salt production, as the concentration of brine increases, the concentration of magnesium chloride and magnesium sulfate in the brine gradually increases, so that the viscosity of the brine gradually increases, the evaporation intensity of the brine decreases, and the amount of brine formed and salt produced per unit time Relatively low volume

Method used

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  • Method for removing magnesium ion and calcium ion in middle-degree brine in salt-field

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Select the waste slag electrolime produced by the chlor-alkali plant as the basic raw material to remove Mg in the brine 2+ , making Mg 2+ It is precipitated in the form of magnesium hydroxide, and the electric lime waste residue after the production of acetylene gas in Tianjin Dagu Chemical Plant is selected. The initial concentration of brine is 11°Be', and its specific operation is as follows:

[0023] 1) Preparation of Ca(OH)2 gray milk

[0024] In a continuous settling tank with stirring, the ratio of electric lime to brine is 1:3 by weight. In the ash milk, Ca(OH) 2 The content is 40g / l, and the ash and slag are separated and discharged in the settling tank at the same time.

[0025] 2) Remove Mg 2+

[0026] According to Mg in brine 2+ content, calculate the amount of electric lime milk, and the excessive amount of electric lime milk is controlled within 5%. A continuous sedimentation reaction tank was used, and the emulsified electric lime milk was slowly ...

Embodiment 2

[0030] The electric lime waste residue after the production of acetylene gas in Tianjin Dagu Chemical Plant is selected. The initial concentration of brine is 13.6°Be', and its specific operation is as follows:

[0031] 1) Ca(OH) 2 Preparation of grey milk

[0032] In a continuous settling tank (emulsification tank) with stirring, the ratio of electric lime and brine is 1:4 by weight, and Ca(OH) in the lime milk 2 The content is 30g / l, and the ash and slag are separated and discharged in the settling tank at the same time.

[0033] 2) Remove Mg 2+

[0034] According to Mg in brine 2+ content, calculate the amount of electric lime milk, and the excessive amount of electric lime milk is controlled within 5%. Using a continuous sedimentation reaction tank, the emulsified electric lime milk was slowly added to the brine, and when the pH was controlled to 11.8, the Mg 2+ with OH - Can fully combine to form insoluble substance Mg(OH) 2 , Mg in brine 2+ The content is 0. Mg(...

Embodiment 3

[0038] The electric lime waste residue after the production of acetylene gas in Tianjin Dagu Chemical Plant is selected. The initial concentration of brine is 18°Be', and its specific operation is as follows:

[0039] 2) Ca(OH) 2 Preparation of grey milk

[0040] In a continuous emulsification barrel with stirring, the ratio of electric lime and brine is 1:2.5 by weight, and Ca(OH) in the lime milk 2 The content is 60g / l, and the ash and slag are separated and discharged in the settling tank at the same time.

[0041] 2) Remove Mg 2+

[0042] According to Mg in brine 2+ content, calculate the amount of electric lime milk, and the excessive amount of electric lime milk is controlled within 10%. Using a continuous sedimentation reaction tank, the emulsified electric lime milk was slowly added to the brine, and when the pH was controlled to 12.5, the Mg 2+ with OH - Can fully combine to form insoluble substance Mg(OH) 2 , Mg in brine 2+ The content is 0. Mg(OH) 2 It i...

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Abstract

The present invention relates to a method to wipe off magnesium hydronium and calcium hydronium by the moderate brine of salt field so as to improve sodium chloride output and quality in a sea salt production zone. When the brine of salt field reaches to 10 to 18 degrees Be', the magnesium hydronium is wiped off by electric lime waste residues. The amount ratio of the electric lime to the brine is 1 : 2.5 to 1 : 4. When the concentration of the electric lime reaches to 30 to 60 g / l, the pH value of the brine in the magnesium wiping off process keeps on 11 to 12.5. When the brine approaches to saturation, mirabilite and a few sodium carbonates are added in the brine to wipe off rest calcium hydronium. The invention leads the composition of beach field brine to generate qualitative change and reduces vaporizing impedance. The brine salt producing amount of unit volume and the potassium chloride content in the salt producing mother liquor have been improved greatly. The invention has not only reduced crystallization area, improved salt quality, but also simplified salinization technics. Under the same output and irrigating pool depth, the invention can save 21 percent beach field area. The production can be increased by 10 percent under the same production area.

Description

technical field [0001] The invention relates to a method for removing magnesium ions and calcium ions by using salt field moderate brine in sea salt production areas to improve the yield and quality of sodium chloride. Background technique [0002] Na in sea water + , K + , Mg 2+ , Ca 2+ , Cl - , SO 4 2- Plasma, in the process of concentrating seawater for salt production, with the increase of brine concentration, most calcium sulfate crystals are crystallized during the period of 12 to 23°Be', and sodium chloride crystals are gradually precipitated when the brine concentration reaches 24.8°Be' or more. When sodium chloride crystallizes, due to the influence of climate and soil conditions, Mg is contained in the voids generated by the formation of sodium chloride crystal clusters. 2+ , Ca 2+ , SO 4 2- At the same time, these ions are also adsorbed on the surface of sodium chloride crystals, reducing the purity of sodium chloride. Typically, solarized raw salt SO ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/06
Inventor 靳志玲李树生付云朋刘安双
Owner ENG TECH INST CO LTD OF CNSIC
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