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A kind of boron-containing raw material liquid stripping boron method
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A raw material liquid, crystallization technology, applied in the direction of boron/boride, etc., can solve the problems of increasing safety precautions, secondary pollution of mother liquor, affecting yield and concentration, etc. Secondary pollution and waste, the effect of stripping volume reduction
Active Publication Date: 2017-07-25
TIANJIN SEA WATER DESALINATION & COMPLEX UTILIZATION INST STATE OCEANOGRAPHI
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And when adopting alkaline water as stripping agent, although this process is an irreversible reaction, the yield is higher, but the solubility of hydrolyzed product borate is also very low, and stripping completes the liquid concentration highest and only has 3.2% (sodium borate, 20 ℃), also needs to go through evaporation concentration, cooling and crystallization to get the final product, and the mother liquor also has secondary pollution and waste problems after crystallization
[0004] Raising the stripping temperature can theoretically increase the maximum concentration of boron in the stripping solution, but in this system, the equilibrium constant and distribution ratio decrease instead, which affects the yield and concentration
At the same time, organic solvents have the problems of high volatility and low flash point. Raising the temperature not only increases energy consumption, but also requires additional safety precautions, which increases costs.
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Embodiment 1
[0030] Under normal temperature, take 100ml of raw material solution with boric acid content of 1.5%, add 500ml mixed alcohol as extractant, mixed alcohol is the mixture of isooctyl alcohol and sulfonated kerosene, the mixing ratio is isooctyl alcohol: sulfonated kerosene = 1: 1, after After multistage countercurrent extraction, a boron-containing organic phase is obtained.
[0031] At room temperature, pour the above 500ml boron-containing organic phase into a separatory funnel, and add 20ml of 3M sodium hydroxide solution for primary stripping. After liquid separation, the purified organic phase and stripping complete solution are obtained, wherein the purified organic phase can directly circulate and extract the boric acid in the raw material liquid, and the stripping complete solution enters the next step.
[0032] At room temperature, add high-concentration sulfuric acid to the stripping solution, adjust the pH value to 10, and a large number of white borax crystals will ...
Embodiment 2
[0034] At room temperature, take 100ml of a raw material solution with a boric acid content of 2.5%, add 500ml of mixed alcohol as an extractant, the mixed alcohol is a mixture of isooctyl alcohol and sulfonated kerosene, and the mixing ratio is isooctyl alcohol: sulfonated kerosene = 1:1, after After multistage countercurrent extraction, a boron-containing organic phase is obtained.
[0035] At room temperature, pour the above 500ml boron-containing organic phase into a separatory funnel, and add 10ml of 5M sodium hydroxide solution for primary stripping. After liquid separation, the purified organic phase and the stripping complete solution are obtained, wherein the purified organic phase can be directly recycled to extract the boric acid in the raw material liquid, and the stripping complete solution enters the next step.
[0036] At room temperature, hydrochloric acid was added to the stripping solution, and when the pH value was adjusted to 9.5, a large number of white cr...
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Abstract
The invention discloses a method for back-extracting and analyzing boron from a boron-containing raw material solution, aiming at solving the problems of low concentration of the back-extracted liquid, high energy consumption of subsequent evaporation or crystallization, and waste liquid discharge pollution in the boron extraction process of the traditional extraction method. The technical steps of the present invention include: reacting the boron-containing raw material liquid with an alcohol organic phase extractant to obtain a purified raw material liquid and a boron-containing organic phase; The stripping complete solution is obtained by one-stage batch reaction; acid is added to adjust the pH value of the stripping completion solution and then crystallized; the crystallized mother liquor obtained after solid-liquid separation is supplemented with solid alkali and water, and then the boron-containing organic phase is recycled and stripped, white borax crystals The borax product is obtained after drying. The invention can effectively reduce the production cost in the process of boron extraction and stripping, and reduce pollution discharge.
Description
technical field [0001] The invention relates to the extraction technology of a boron-containing raw material liquid, in particular to a boron-containing raw material liquid back-extraction boron analysis method. Background technique [0002] After the boron-containing raw material liquid is reacted with an organic phase extractant such as isooctyl alcohol, a purified raw material liquid and a boron-containing organic phase can be obtained, wherein the boron in the organic phase exists in the form of borate ester. For the boron-containing organic phase obtained in the extraction process, in the prior art, solutions with different pH values are mainly used for stripping. [0003] Neutral water is the most commonly used stripping agent. Although the hydrolysis rate of boric acid ester in the organic phase is extremely fast, the solubility of the hydrolyzed product boric acid is very low, and it usually takes 5 to 20 times the volume of water and multi-stage countercurrent to ...
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Patent Type & Authority Patents(China)
IPC IPC(8): C01B35/02
Inventor 刘伟赵旭陆永超董泽亮张亚南郝晓翠柴澍靖张琦黄西平
Owner TIANJIN SEA WATER DESALINATION & COMPLEX UTILIZATION INST STATE OCEANOGRAPHI
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