Extraction and boron removal method for lithium-containing brine

An extraction and brine technology, applied in chemical instruments and methods, water pollutants, flotation water/sewage treatment, etc., can solve the problems of octanol dissolution loss and low extraction precision, and achieve the effect of increasing solubility

Inactive Publication Date: 2017-12-12
JIANGSU CHANGJILI NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of the problems existing in the above-mentioned prior art, the object of the present invention is to provide a method for extracting a...

Method used

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  • Extraction and boron removal method for lithium-containing brine

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Experimental program
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Effect test

Embodiment 1

[0034] The boron-containing lithium chloride aqueous solution to be treated has a boron content of 600 ppm, and the boron-containing lithium chloride aqueous solution is acidified to pH 2 with hydrochloric acid;

[0035] Mix iso-octanol and 2-octanol in a volume ratio of 11:1 to obtain an octanol mixed solution, and mix an octanol mixed solution with kerosene in a volume ratio of 6:4; make a mixed extractant, which can be used in the environment The temperature is 25°C, after fully mixing the acidified boron-containing lithium chloride water and the mixed extractant, let it stand for 2 hours;

[0036] After standing still, the mixed liquid phase separation of boron-containing lithium chloride water and mixed extractant is an oil phase and a first water phase;

[0037] Export the first aqueous phase and detect the boron content. If the boron content exceeds the standard, it is returned to step (2) and extracted as boron-containing lithium chloride water. The operation is repeat...

Embodiment 2

[0040] The boron-containing lithium chloride aqueous solution to be treated has a boron content of 600 ppm, and the boron-containing lithium chloride aqueous solution is acidified to pH 2 with hydrochloric acid;

[0041] Mix iso-octanol and 2-octanol in a volume ratio of 13:1 to obtain octanol mixed solution, and mix octanol mixed solution with kerosene in a volume ratio of 6:4; make a mixed extractant, which can be used in the environment The temperature is 25°C, after fully mixing the acidified boron-containing lithium chloride water and the mixed extractant, let it stand for 2 hours;

[0042] After standing still, the mixed liquid phase separation of boron-containing lithium chloride water and mixed extractant is an oil phase and a first water phase;

[0043] Export the first aqueous phase and detect the boron content. If the boron content exceeds the standard, it is returned to step (2) and extracted as boron-containing lithium chloride water. The operation is repeated 3 t...

Embodiment 3

[0046] The boron-containing lithium chloride aqueous solution to be treated has a boron content of 600 ppm, and the boron-containing lithium chloride aqueous solution is acidified to pH 2 with hydrochloric acid;

[0047] Mix iso-octanol and 2-octanol in a volume ratio of 14:1 to obtain an octanol mixed solution, and mix an octanol mixed solution with kerosene in a volume ratio of 6:4; prepare a mixed extractant, which can be used in the environment The temperature is 25°C, after fully mixing the acidified boron-containing lithium chloride water and the mixed extractant, let it stand for 2 hours;

[0048] After standing still, the mixed liquid phase separation of boron-containing lithium chloride water and mixed extractant is an oil phase and a first water phase;

[0049]Export the first aqueous phase and detect the boron content. If the boron content exceeds the standard, it is returned to step (2) and extracted as boron-containing lithium chloride water. The operation is repe...

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Abstract

The invention discloses an extraction and boron removal method for lithium-containing brine. The extraction and boron removal method comprises the following steps that 1, acidification is performed, wherein the pH value of a lithium chloride water solution containing boron is acidized to 1-3 by using hydrochloric acid; 2, mixing and extraction are performed, wherein isooctyl alcohol and 2-octanol are mixed according to the ratio of 10-18 to 1 to obtain an octanol mixed solution; the octanol mixed solution is mixed with kerosene to prepare a mixed extracting agent, the kerosene accounts for 30-70% of the total volume of the mixed extracting agent, and standing is performed for 1-3 hours after the acidized lithium chloride water solution containing boron and the mixed extracting agent are fully mixed; 3, phase splitting is performed, wherein a mixed liquid phase of the lithium chloride water solution containing boron and the mixed extracting agent is divided into an oil phase and a first water phase after standing; 4, recovery is performed, wherein the first water phase is guided out, the boron content is detected, the first water phase is re-guided back to the step 2 under the situation that the boron content exceeds the standard and serves as lithium chloride water containing boron to perform extraction, the operation is repeated till the boron content of the water phase is up to the standard. The lithium-containing brine can be extracted in a low-cost and efficient mode, treated waste water can be secondarily utilized, and environmental pollution can be reduced.

Description

technical field [0001] The invention belongs to the field of chemical industry and relates to a method for extracting and removing boron from lithium-containing brine. Background technique [0002] There are two types of lithium-containing brine water, one is mineral lithium-containing brine, and the other is lithium-containing industrial wastewater, which generally contains lithium, sodium, magnesium, calcium and other metal elements, as well as silicon, boron, sulfur, chlorine, bromine, etc. non-metallic elements. Elements such as silicon and sulfur in metal elements and non-metal elements can be separated by means of classified crystallization and sedimentation to obtain relatively high-purity lithium salts. Since boron exists in the form of boric acid or borate in brine, boric acid or borate They all have high solubility in water, and it is difficult to reduce the boron element in brine to a lower level, which brings great technological difficulties to the subsequent pu...

Claims

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Application Information

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IPC IPC(8): C02F9/04C10G7/00C02F101/10
CPCC02F1/24C02F1/66C02F9/00C02F2001/007C02F2101/108C10G7/006C10G2300/1007
Inventor 史先乔储鹏黄卫军谢云良蒋国群
Owner JIANGSU CHANGJILI NEW ENERGY TECH CO LTD
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