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 extrac

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
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Example Embodiment

[0029]Example 1

[0030]Extraction stock solution contains Fe3+102.61g / L, Al3+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, extraction time is 5 minutes, and 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% secondary octanol + sulfonated kerosene" is used as the extraction system, the iron distribution ratio is 0.98, which is greater than "25% TBP + sulfonated kerosene" and "35% secondary octanol + sulfonated kerosene" When kerosene is used as an extraction system, the total iron distribution ratio is 0.59, indicating that TBP and secondary octanol have a synergistic extraction effect, and secondary octanol is also beneficial to eliminate the three phases formed. Therefore, in the extraction system of "25% TBP + 35% secondary octanol + sulfonated kerosene", secondary octanol is both a...

Example Embodiment

[0035]Example 2

[0036]Extraction stock solution contains Fe3+76.24g / L, Al3+13.56g / L, hydrochloric acid 3.3mol / L, the extraction system used is phosphate ester TBP: secondary octanol: sulfonated kerosene = 6:7:7 (ie 30% TBP + 35% secondary octanol + 35% by mass Sulfonated kerosene), extraction ratio O / A (organic phase / water phase) = 3 / 1, extraction temperature is room temperature, extraction time is 4 min, six-stage countercurrent extraction.

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

[0038]

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

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

[0041]Table 3 Six-stage c...

Example Embodiment

[0046]Example 3

[0047]Extraction stock solution contains Fe3+127.98g / L, Al3+11.36g / L, 3.5mol / L hydrochloric acid, the extraction system used is phosphate ester TBP: secondary octanol: sulfonated kerosene in mass ratio = 1:2:2 (ie 20% TBP + 40% secondary octanol + 40% Sulfonated kerosene), extraction ratio O / A=3.5 / 1, extraction temperature at room temperature, extraction time 4min, five-stage countercurrent extraction.

[0048]Table 4 Five-stage countercurrent cascade extraction data sheet

[0049]

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

[0051]Take the above-mentioned loaded organic phase for back extraction, the ratio of back extraction 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 5 min, six-stage counter current back extraction .

[0052]Table 5 Six-stage countercurrent cascade back extraction data sheet

[0053]

[0054]The stri...

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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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