Process for recovering magnesium sulfate monohydrate from boron extraction mother liquor

A technology of magnesium sulfate and boron mother, applied in directions such as magnesium sulfate, can solve the problems of high equipment requirements, unfavorable technology promotion and utilization, large energy consumption, etc., and achieves low equipment requirements, high economic value, and low operating temperature. Effect

Inactive Publication Date: 2013-08-07
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method introduces a high-temperature and high-pressure crystallizer into the magnesium extraction process, the temperature rises to about 180°C, and the high-pressure state is maintained during the crystallization process, which not only requires large energy consumption, but also has high requirements for equipment and devices, which is not conducive to the promotion of technology and use

Method used

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  • Process for recovering magnesium sulfate monohydrate from boron extraction mother liquor
  • Process for recovering magnesium sulfate monohydrate from boron extraction mother liquor
  • Process for recovering magnesium sulfate monohydrate from boron extraction mother liquor

Examples

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Effect test

Embodiment 1

[0023] Example 1 Such as image 3 Shown, a kind of technique that reclaims magnesium sulfate monohydrate from boron extracting mother liquor comprises the following steps:

[0024] (1) Under normal pressure conditions, put 3.87t of the boron extracting mother liquor with an initial composition of magnesium sulfate concentration of 20.4% and boric acid concentration of 0.2% into the evaporation reactor. When heated to 95°C, the boron extracting mother liquor starts to boil and keep the temperature unchanged; When the concentration of boron extraction mother liquor reaches 1.410g / mL or 42 ? When Be', slowly raise the temperature to 104°C at a rate of 0.05°C / min; ? When Be', 2.45t concentrated liquid and 2.05t condensed water A are obtained respectively.

[0025] (2) Move the concentrated solution to the crystallizer, and carry out constant temperature evaporation and crystallization at a temperature of 120°C. When the solid-to-liquid ratio is 2g:1L, 1.47t of slurry and ...

Embodiment 2

[0029] Example 2 Such as image 3 Shown, a kind of technique that reclaims magnesium sulfate monohydrate from boron extracting mother liquor comprises the following steps:

[0030] (1) Under normal pressure, put 3.93t of the boron-extracting mother liquor with an initial composition of magnesium sulfate concentration of 18% and boric acid concentration of 4% into the evaporation reactor, and when heated to 95°C, the boron-extracting mother liquor begins to boil and keep the temperature constant; When the concentration of boron extraction mother liquor reaches 1.397g / mL or 41 ? When Be', slowly raise the temperature to 102°C at a rate of 0.05°C / min; ? When Be', 5.08t of concentrated liquid and 2.19t of condensed water A were obtained respectively.

[0031] (2) Move the concentrated solution to the crystallizer, and carry out constant temperature evaporation and crystallization at a temperature of 110°C. When the solid-liquid ratio is 0.5 g: 1L, 4.05t of slurry and 1.03...

Embodiment 3

[0035] Example 3 Such as image 3 Shown, a kind of technique that reclaims magnesium sulfate monohydrate from boron extracting mother liquor comprises the following steps:

[0036] ⑴Under normal pressure, put 3.78t of the boron-extracting mother liquor with an initial composition of magnesium sulfate concentration of 24% and boric acid concentration of 0% into the evaporation reactor, and when heated to 94°C, the boron-extracting mother liquor begins to boil and keep the temperature constant; When the concentration of boron extraction mother liquor reaches 1.410g / mL or 42 ? When Be', slowly raise the temperature to 105°C at a rate of 0.1°C / min; ? When Be', 2.60t concentrated liquid and 1.83t condensed water A are obtained respectively.

[0037] (2) Move the concentrated solution to the crystallizer, and carry out constant temperature evaporation and crystallization at a temperature of 120°C. When the solid-to-liquid ratio is 2g:1L, 1.56t of slurry and 1.04t of condens...

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Abstract

The invention relates to a process for recovering magnesium sulfate monohydrate from boron extraction mother liquor. The process comprises the following steps of: (1) pouring the boron extraction mother liquor with the initial composition of magnesium sulfate with the concentration of 18%-24% and boric acid with the concentration of 0%-4% into an evaporation reaction kettle under normal-pressure conditions, heating till boiling, and keeping the temperature unchanged; slowly increasing the temperature to 102-105 DEG C when the concentration of the boron extraction mother liquor achieves 1.397-1.410g / mL or 41-42 Be'; and continuously heating, and respectively obtaining a concentrated solution and condensed water A when the concentration of the boron extraction mother liquor achieves 1.468-1.483g / mL or 46-47 Be'; (2) transferring the concentrated solution into a crystallizer, and performing constant-temperature evaporation and crystallization to obtain slurry and condensed water B; (3) performing thermal separation on the slurry to obtain a magnesium sulfate monohydrate crude product; washing the magnesium sulfate monohydrate crude product with a mixed solution of the condensed water A and the condensed water B to respectively obtain a wet product and a washing solution; and returning the washing solution to the step (1) for recycling; and (4) drying the wet product till constant weight to obtain the magnesium sulfate monohydrate. The process disclosed by the invention has the characteristics of low energy consumption and low cost.

Description

technical field [0001] The invention relates to the technical field of boric acid production, in particular to a process for recovering magnesium sulfate monohydrate from boron extraction mother liquor. Background technique [0002] Boron is a very important chemical raw material. The domestic production of boric acid is mainly produced by reacting boron magnesium ore with sulfuric acid, but at the same time, a large amount of mother liquor rich in magnesium sulfate is also produced. In the past, this mother liquor was discharged, which not only caused some water and soil environment pollution, but also made the resources unable to be fully utilized, resulting in great losses. This has also become a bottleneck restricting the large-scale development of my country's boron industry. Therefore, the recovery and utilization of boron extraction mother liquor has become a key to the development of boron industry. [0003] At present, the following two schemes are usually adopted ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/40
Inventor 时历杰王敏李洪岭康为清赵有璟
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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