Method for removing lead and zinc elements in ferrous chloride acidic waste water
A technology of acidic wastewater and ferrous chloride, applied in chemical instruments and methods, ferric halide, water/sewage treatment, etc., can solve the problems of treatment process influence, ferrous form change, separation, etc., and achieve high selectivity and high efficiency high efficiency, selectivity, and low operating costs
Inactive Publication Date: 2013-04-03
NANJING NORMAL UNIVERSITY
View PDF4 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
In the above method, the pH value of the wastewater system is adjusted through the acid-base neutralization reaction, which easily causes the change of the form of ferrous iron. Once the ferric salt compound is formed, under the operating pH value condition, the ferric hydroxide will be separated from the wastewater in the form of precipitation at first. , which has a serious impact on the subsequent processing
In the method disclosed in patent application CN01108273.9 by Qiu Tao et al., hydrogen chloride and ferrous salt are recovered through high-temperature evaporation and concentration, but heavy metals lead and zinc are not separated in the process, so the recovered ferrous chloride product It is difficult to meet relevant usage standards
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0034] A method for removing lead and zinc elements in ferrous chloride acidic wastewater, the steps are as follows:
[0035] (1) Add the complex extraction agent of 180mL0.3mol / L in 1000mL waste water, measure the residual concentration of zinc element in the aqueous phase after extraction and separation;
[0036] (2) Add 20 mL of 4.0 mol / L sodium hydroxide solution to the extracted organic phase, and the zinc element is transferred to the aqueous phase in the form of tetrahydroxyzincate ions;
[0037] (3) Add 40mL1.0mol / L sodium sulfide solution to the aqueous phase after extraction and separation to carry out precipitation reaction;
[0038] (4) The lead sulfide produced by the reaction is filtered and separated, and the residual concentration of lead element in the treated waste water is measured.
Embodiment 2
[0039] Example 2 is basically the same as Example 1, except that the volume of the extractant added in the (1) step is 200 mL.
Embodiment 3
[0040] Embodiment 3 is substantially the same as Embodiment 1, except that the volume of sodium hydroxide solution added in the (2) step is 18 mL.
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a method for removing lead and zinc elements in ferrous chloride acidic waste water, which comprises the following steps: (1) adding a complexing extractant into ferrous chloride acidic waste water, performing extraction separation of zinc element; (2) adding a stripping agent into the extraction organic phase for back extraction, allowing the zinc element to be transferred to the water phase in a form of tetrahydroxyzincate ion; (3) adding a precipitator into the extraction water phase in step (1), allowing lead element in the waste water to generate lead sulfide precipitate; (4) filtering and separating the precipitate to obtain a ferrous chloride solution. The extractant used by the invention has high efficiency and high selectivity, and can be recycled after back extraction treatment. The ferrous chloride acidic waste water treated by the method of the invention has zinc and lead element concentrations which are reduced to below 10 ppm, and the method has aferrous chloride recovery rate of up to 98%.
Description
technical field [0001] The invention belongs to the technical field of environmental protection, and relates to a method for the treatment and resource utilization of ferrous chloride acidic wastewater, in particular to a method for removing lead and zinc elements in the ferrous chloride acidic wastewater. Background technique [0002] In the steel wire rope industry, dilute hydrochloric acid (about 10% by mass) is usually used to wash the rust and other metal oxide layers on the surface of steel products, resulting in a large amount of acidic wastewater. This kind of wastewater contains high concentration of ferrous chloride, so it has good utilization value and application prospect, but in the process of process treatment, because heavy metal elements such as zinc and lead are also dissolved in the waste acid in the form of chloride, making The recycling of ferrous chloride in this waste water has been severely restricted. [0003] At present, the traditional method of tr...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C01G49/10C02F1/58C02F1/26C02F1/52
Inventor 崔世海杨帆
Owner NANJING NORMAL UNIVERSITY