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Method for separating magnesium from old brine of saline lake and reducing magnesium lithium ratio

A salt lake old brine, magnesium-lithium ratio technology, applied in chemical instruments and methods, lithium compounds, alkali metal compounds, etc., can solve the problem of unsatisfactory separation effect, and achieve low cost and simple process operation

Inactive Publication Date: 2016-12-21
QINGHAI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] However, precipitation methods, solvent extraction methods, and ion exchange adsorption methods are more suitable for separating magnesium and lithium from salt lake brines with low and medium magnesium-lithium ratios; Magnesium, Lithium, the separation effect is very unsatisfactory

Method used

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  • Method for separating magnesium from old brine of saline lake and reducing magnesium lithium ratio

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Embodiment 1

[0020] Embodiment 1, a method for separating magnesium from old salt lake brine and reducing the ratio of magnesium to lithium, is characterized in that: it is completed by the following steps, old brine→membrane distillation concentration→crystallization separation, the raw material solution storage tank contains Mg 2+ 4.58mol / L, Li + 1950.0g of 0.29mol / L old brine is heated by the heat exchanger and then pumped into the membrane distillation component. The volatile water vapor enters the cold side through the hydrophobic membrane, and is collected into the pure water storage tank after cooling; The concentrated solution of the hydrophobic membrane is circulated back to the raw material solution storage tank, and the raw material solution is continuously concentrated until the raw material solution reaches supersaturation and crystallization will occur. The supersaturated raw material solution is transferred to the crystallizer, and the electric stirring device is turned on to...

Embodiment 2

[0023] Embodiment 2, a method for separating magnesium from salt lake old brine and reducing the ratio of magnesium to lithium, is characterized in that: it is completed by the following steps, old brine→membrane distillation concentration→crystallization separation, and the raw material solution storage tank contains Mg 2+ 4.58mol / L, Li +1950.0g of 0.29mol / L old brine is heated by the heat exchanger and then pumped into the membrane distillation module. The volatile water vapor enters the cold side through the hydrophobic membrane, and is collected into the pure water storage tank after cooling; The concentrated solution of the hydrophobic membrane is circulated back to the raw material solution storage tank, and the raw material solution is continuously concentrated until the raw material solution reaches supersaturation and crystallization will occur. The supersaturated raw material solution is transferred to the crystallizer, and the electric stirring device is turned on to...

Embodiment 3

[0026] Embodiment 3, a method for separating magnesium from old salt lake brine and reducing the ratio of magnesium to lithium, is characterized in that: it is completed by the following steps, old brine→membrane distillation concentration→crystallization separation, and the raw material solution storage tank contains Mg 2+ 4.58mol / L, Li + 1950.0g of 0.29mol / L old brine is heated by the heat exchanger and then pumped into the membrane distillation module. The volatile water vapor enters the cold side through the hydrophobic membrane, and is collected into the pure water storage tank after cooling; The concentrated solution of the hydrophobic membrane is circulated back to the raw material solution storage tank, and the raw material solution is continuously concentrated until the raw material solution reaches supersaturation and crystallization will occur. The supersaturated raw material solution is transferred to the crystallizer, and the electric stirring device is turned on t...

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Abstract

A method for separating magnesium from old brine of a saline lake and reducing magnesium lithium ratio relates to the field of chemical industry, and comprises the following steps in order: the old brine is concentrated by membrane distillation, and then is crystallized and separated; the method has the advantages that the magnesium lithium molar ratio of the old brine of the is reduced to less than 1, the method is as a solvent extraction method, ion exchange adsorption method and other conventional method suitable for magnesium and lithium separation of the brine of a saline lake with medium and low magnesium lithium ratio, can realize complete magnesium and lithium separation, and achieves the key technology of the development of the saline lake.

Description

1. Technical field [0001] The invention relates to the field of chemical industry, in particular to a method for separating magnesium from old salt lake brine and reducing the ratio of magnesium to lithium. 2. Background technology [0002] The Qaidam Basin in Qinghai Province is one of the four major salt lake regions in my country. There are more than 30 salt lakes in total, most of which are chloride type and sulfate (sub) type salt lakes. In addition to being rich in potassium, sodium, lithium, magnesium, boron, Element resources such as sulfur and chlorine, and resources such as rubidium, cesium, bromine and iodine also have certain reserves. Especially magnesium (as MgCl 2 In terms of reserves, the reserves are about 2 billion tons) and lithium resources (in terms of LiCl, the reserves are about 15.207 million tons), which have become abundant resources with international competitive advantages in my country. However, compared with many salt lakes in foreign countries...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/00
CPCC01D15/00
Inventor 毕秋艳张志强牛辉哲陶箴奇孟永涛保英莲季阳刘雪丽曹菁潘星艺申仕岭黄文校
Owner QINGHAI UNIVERSITY