Extractant composition and resource utilization method of iron-containing wastewater

An extraction agent and composition technology, which is applied to the resource utilization of iron-containing wastewater and the field of extraction agent composition, can solve the problem that the organic amine extraction agent is expensive, the waste water resource utilization cost is high, and the extraction system has weak iron extraction ability. problem, to achieve the effect of low cost, large saturated capacity, and reduced processing cost

Pending Publication Date: 2021-02-23
SHENHUA ZHUNNENG RESOURCE COMPREHENSIVE DEV COMPANY
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Problems solved by technology

Chinese patent CN102061398A adopts the extraction system of "N503-isooctanol-sulfonated kerosene" to carry out three-stage extraction on the solution containing iron 2-7g / L, and then back-extract the iron with 2% oxalic acid and 1 mol / L hydrochloric acid , the disadvantage is that the extraction system has a weak ability to extract iron, and back extraction requires oxalic acid and 1 mol / L hydrochloric acid, the consumption of raw and auxiliary materials is high, and it is difficult to realize industrial application
Li Mingyu and others invented a method for extracting and separating iron and aluminum from the hydrochloric acid system. The extraction system used is "N503-TBP-n-octanol-sulfonated kerosene". This extraction system has high selectivity and aluminum is not extracted. The separation of iron and aluminum is thorough, but the concentration of ferric iron it targets is 50-60g / L, and there is no mention of the extraction and separation of ferric iron containing more than 60g / L
For the extraction and separation of high-concentration iron, Chinese patent CN 110885931A adopts the extraction system of "N,N-bis(1-methylheptyl) caproamide (N503)-tributyl phosphate-sec-octanol-sulfonated kerosene", to Fe 3+ = 60 ~ 120g / L solution for extraction, realizing the resource recycling of iron ions, aluminum ions and hydrochloric acid in the waste liquid, but in the extraction system used by this technology, the proportion of N503 has reached 30%, and N503 Expensive, and the extraction system is relatively complicated
[0004] Based on the above-mentioned technologies, it is not difficult to see that most of the existing iron extraction systems use organic amine extractants, or use organic amine extractants and phosphate ester extractants in combination. Organic amine extractants are expensive, resulting in resource utilization of wastewater higher cost

Method used

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  • Extractant composition and resource utilization method of iron-containing wastewater
  • Extractant composition and resource utilization method of iron-containing wastewater
  • Extractant composition and resource utilization method of iron-containing wastewater

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The extract contains Fe 3+ 102.61g / L, Al 3+ 12.81g / L, hydrochloric acid 3.7mol / L, the extraction system used is shown in Table 1. The extraction process conditions are: O / A=2 / 1, the extraction time is 5 minutes, and the extraction temperature is 25°C.

[0031] Table 1 Extraction results of different extraction systems

[0032]

[0033]

[0034] The results in Table 1 show that when "25% TBP + 35% 2-octanol + sulfonated kerosene" is used as the extraction system, the iron distribution ratio is 0.98, which is greater than that of "25% TBP + sulfonated kerosene" and "35% 2-octanol + sulfonated kerosene". The sum of the distribution ratios of iron when "kerosene" is used as the extraction system is 0.59, indicating that TBP and 2-octanol have a synergistic extraction effect, and 2-octanol is also beneficial to eliminate the formed three phases. Therefore, in the extraction system of "25% TBP + 35% 2-octanol + sulfonated kerosene", 2-octanol is both a co-extractant ...

Embodiment 2

[0036] The extract contains Fe 3+ 76.24g / L, Al 3+ 13.56g / L, hydrochloric acid 3.3mol / L, the extraction system used is phosphoric acid ester TBP by mass ratio: secondary octanol: sulfonated kerosene=6:7:7 (that is 30% TBP+35% secondary octanol+35% sulfonated kerosene), extraction ratio O / A (organic phase / water phase)=3 / 1, extraction temperature is room temperature, extraction time is 4min, six-stage countercurrent extraction.

[0037] Table 2 Six-stage countercurrent cascade extraction data table

[0038]

[0039] The iron extraction residue is returned to the fly ash for leaching aluminum with hydrochloric acid.

[0040] Take the loaded organic phase after the above extraction and carry out back-extraction. Compared with O / A=3.5 / 1 in back-extraction, the back-extraction agent is pH=1 acidified water (0.1mol / L hydrochloric acid solution), back-extraction at room temperature, and the time for back-extraction for 5min, six-stage countercurrent back extraction.

[0041] Tab...

Embodiment 3

[0047] The extract contains Fe 3+ 127.98g / L, Al 3+ 11.36g / L, hydrochloric acid 3.5mol / L, the extraction system used is phosphoric acid ester TBP by mass ratio: secondary octanol: sulfonated kerosene=1:2:2 (that is 20% TBP+40% secondary octanol+40% sulfonated kerosene), extraction ratio O / A=3.5 / 1, extraction temperature is room temperature, extraction time is 4min, five-stage countercurrent extraction.

[0048] Table 4 five-stage countercurrent cascade extraction data table

[0049]

[0050] The iron extraction residue is returned to the fly ash for leaching aluminum with hydrochloric acid.

[0051] Take the loaded organic phase after the above extraction for back extraction, the back extraction ratio is O / A=3 / 1, the back extraction agent is acidified water with pH=1, back extraction at room temperature, the back extraction time is 5min, six-stage countercurrent back extraction .

[0052] Table 5 Six-stage countercurrent cascade stripping data table

[0053]

[0054]...

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Abstract

The invention provides an extractant composition. The extractant composition comprises the following components in percentage by mass: 20-40% of a phosphate extractant as shown in a formula 1, 35-50%of C6-C10 monohydric alcohol and the balance of a diluent. The invention further provides a resource utilization method of the iron-containing wastewater, and the extractant composition is used in theresource utilization method. The extractant composition disclosed by the invention does not need to use an organic amine extractant, is simple in extraction system and relatively low in cost, and does not easily generate a third phase even under high-concentration iron, so that the extractant composition can be suitable for extraction treatment of various iron-containing wastewater. The resourceutilization method provided by the invention can effectively extract and separate iron from the iron-containing wastewater for resource utilization, is very suitable for large-scale application, and has important economic and social values;.

Description

technical field [0001] The invention relates to the field of industrial wastewater treatment, in particular to an extractant composition and a resource utilization method of iron-containing wastewater using the extractant composition. Background technique [0002] Fly ash is one of the industrial wastes with the largest discharge in my country, and unreasonable treatment will cause serious social and environmental problems. At the same time, fly ash is rich in Al 2 o 3 , is an important non-traditional alumina resource and a potential bauxite substitute. Therefore, the comprehensive utilization of fly ash to extract alumina has become a major research hotspot. Among them, Shenhua Group Zhuneng Resources Comprehensive Development Co., Ltd. has researched and developed the process of extracting alumina from fly ash by "one-step acid dissolution method". In this process, the fly ash first undergoes a one-step acid dissolution process, in which aluminum, gallium, iron and some...

Claims

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Application Information

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IPC IPC(8): C02F1/26C01G49/06C01F7/56C02F101/20
CPCC02F1/26C01G49/06C01G49/0009C01F7/56C02F2101/203
Inventor 张云峰周小舟杨磊赵建强沈裕军王永旺彭俊王丽萍白健钟山王凯贾敏
Owner SHENHUA ZHUNNENG RESOURCE COMPREHENSIVE DEV COMPANY
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