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Method for enriching micro elements in saturate magnesium chloride brine by recycling potassium chloride

A technology of medium and trace elements and trace elements, applied in the directions of magnesium chloride, magnesium halide, alkali metal chloride, etc., can solve the problems of slow evaporation rate, difficulty in natural evaporation and concentration, complex physicochemical properties of brine, etc., and achieve the effect of short time

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

In the old brine stage, the evaporation rate of brine will become very slow, and even in rainy days, there will be the possibility of sucking water back from the air, the enrichment speed of trace elements in brine will become very slow, and the physical and chemical properties of brine will become It is more complicated. It is difficult to continue natural evaporation and concentration after magnesium chloride reaches saturation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1 The method for recycling potassium chloride to enrich trace elements in saturated magnesium chloride brine comprises the following steps:

[0020] (1) Natural evaporation treatment: Sulfate-type salt field brine is exposed to the sun and evaporated naturally, and loses water to concentrate the salt field brine to become old salt field brine. The mass content of the main ions in this salt field old brine is K + 0.04%, Mg 2+ 8.3%, Cl - 22.3%, SO 4 2- 2.8%, the mass ratio of trace elements is Li 0.0091%, B 0.0233%.

[0021] (2) add KCl to process: get the KCl 1.14kg of purity ≥ 98.0% and 114g distilled water and mix and stir after being pasty, get Yantian old brine 20kg, join the Yantian old brine of step (1) gained with the speed of 25g / min In the paste, stir for 3 hours, and perform solid-liquid separation after the complete transformation of Yantian old brine and KCl, to obtain 14 kg of mother liquor A and 7.10 kg of solid phase A.

[0022] Among t...

Embodiment 2

[0029] Embodiment 2 The method for recycling potassium chloride to enrich trace elements in saturated magnesium chloride brine comprises the following steps:

[0030] (1) Natural evaporation treatment: Sulfate-type salt field brine is exposed to the sun and evaporated naturally, and loses water to concentrate the salt field brine to become old salt field brine. The mass content of the main ions in this salt field old brine is K + 0.06%, Mg 2+ 8.60%, Cl - 22.6%, SO 4 2- 3.70%, the mass content of trace elements is Li0.0098%, B 0.0211%.

[0031] (2) Add KCl to process: get KCl 1.36kg of purity ≥ 98.0% and 135g distilled water to mix and stir after being pasty, get Yantian old brine 20kg, with the speed of 25g / min, the Yantian old brine of step (1) gained is added to In the paste, stir for 4 hours, and perform solid-liquid separation after the complete transformation of Yantian old brine and KCl, and obtain 14.4kg of mother liquor A and 6.90kg of solid phase A.

[0032]...

Embodiment 3

[0039] Embodiment 3 The method for recycling potassium chloride to enrich trace elements in saturated magnesium chloride brine comprises the following steps:

[0040] (1) Natural evaporation treatment: Sulfate-type salt field brine is exposed to the sun and evaporated naturally, and loses water to concentrate the salt field brine to become old salt field brine. The mass content of the main ions in this salt field old brine is K + 0.05%, Mg 2+ 8.45%, Cl - 22.5%, SO 4 2- 3.0%, the mass ratio of trace elements is Li0.0096%, B0.0240%.

[0041] (2) Add KCl for treatment: take 1.25 kg of KCl with a purity of ≥98.0% and 137.5 g of distilled water and mix it into a paste, then take 20 kg of Yantian old brine, and add the obtained Yantian brine at a rate of 25 g / min. Put it into the paste, stir for 3.5 hours, and carry out solid-liquid separation after the complete conversion of Yantian old brine and KCl to obtain mother liquor A14.2kg and solid phase A7.00kg.

[0042] Among them...

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Abstract

The invention relates to a method for enriching micro elements in saturate magnesium chloride brine by recycling potassium chloride. The method comprises the following steps of: (1) carrying out natural evaporation treatment on sulphate type salt pan brine to obtain salt pan old brine; (2) adding KCl for treating, and carrying out solid-liquid separation to obtain mother liquor A and a solid phase A; (3) carrying out natural evaporation on the mother liquor A to obtain mother liquor B and a solid phase B; (4) sequentially carrying out transformation, separation and natural evaporation on the mother liquor B according to the steps (2) and (3), and carrying out the solid-liquid separation to obtain mother liquor C and a solid phase C; and (5) decomposing and floating carnallite in the solidphase B obtained in the step (3) and the solid phase C obtained in the step (4) according to a conventional method to obtain potassium chloride with the purity more than or equal to 88.0%. In the invention, a process route is simple, and natural evaporation and concentration can be continuously carried out under the condition that natural evaporation speed of the brine is slow or natural evaporation of the brine is stopped.

Description

technical field [0001] The invention relates to the technical field of inorganic salt chemical industry, in particular to a method for recycling potassium chloride to enrich trace elements in saturated magnesium chloride brine. Background technique [0002] Sulfate type salt lake brine is rich in K, Mg, Na, Cl, SO 4 2- , and some trace elements, such as: lithium, rubidium, bromine, uranium, etc. In the old brine stage, the evaporation rate of brine will become very slow, and even in rainy days, there will be the possibility of sucking water back from the air, the enrichment speed of trace elements in brine will become very slow, and the physical and chemical properties of brine will become It is more complicated. It is difficult to continue natural evaporation and concentration after magnesium chloride reaches saturation. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a method for recycling potassium chloride...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/40C01F5/30C01D3/04
Inventor 周园董生发马艳芳张志宏
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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