Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for catalytic oxidation of high-concentration trivalent arsenic through ferrous irons

A technology of catalytic oxidation and the use of ferrous iron, which is applied in chemical instruments and methods, oxidized water/sewage treatment, water pollutants, etc., can solve the problems of equipment erosion, unsatisfactory effect, and difficulty in applying trivalent arsenic material centralized treatment, etc. To achieve the effect of convenient operation and simple process

Inactive Publication Date: 2019-04-16
CENT SOUTH UNIV
View PDF10 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If it is not pre-neutralized, it will not be oxidized, and the corrosion of the equipment will be very serious. At present, the promotion effect of the ferrous salt catalyst on the oxidation of trivalent arsenic is limited to the mg / L level of trivalent arsenic solution, and without the assistance of hydrogen peroxide In this case, the effect is not ideal, and it is difficult to apply to the centralized treatment of a large number of high-concentration trivalent arsenic materials

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 more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for catalytic oxidation of high-concentration trivalent arsenic through ferrous irons
  • Method for catalytic oxidation of high-concentration trivalent arsenic through ferrous irons

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The ferrous sulfate solution and the arsenous acid solution were mixed according to the initial iron-arsenic molar ratio of 2:1, and the trivalent arsenic concentration after mixing was 0.5g / L. Use sulfuric acid to adjust the pH value of the mixed solution to 0.5, and then move it into the autoclave. After the temperature in the reactor rises to 150°C, 1 MPa oxygen is introduced, and the solution is fully stirred at a uniform speed while maintaining a stirring rate of 200 rpm. The reaction was maintained for 180 minutes, during which samples were taken every 60 minutes, and the samples obtained at 60 minutes, 120 minutes and 180 minutes were tested and analyzed. The oxidation rates of arsenous acid obtained were 37.83%, 45.00%, and 46.33%, respectively.

Embodiment 2

[0032] The arsenous acid solution was oxidized according to the method of Example 1. Change the oxygen pressure to 0.5 MPa, and the other conditions are exactly the same as in Example 1. The samples obtained at 60min, 120min and 180min were tested and analyzed. The oxidation rates of the obtained arsenous acid were 13.19%, 25.26%, and 30.02%, respectively.

Embodiment 3

[0034] The arsenous acid solution was oxidized according to the method of Example 1. Change the initial iron-arsenic molar ratio to 5:1, and the other conditions are exactly the same as in Example 1. The samples obtained at 60min, 120min and 180min were tested and analyzed. The oxidation rates of arsenous acid obtained were 52.02%, 58.15%, and 60.10%, respectively.

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

No PUM Login to View More

Abstract

The invention relates to a method for catalytic oxidation of high-concentration trivalent arsenic through ferrous irons. The method comprises the following steps of mixing 0.001-50 g / L of a trivalentarsenic solution with ferrite, and adjusting the pH to be smaller than 7; adding a mixed solution the pH of which is adjusted into a high-pressure kettle, stirring the mixed solution and heating the mixed solution to a certain temperature, and afterwards, introducing oxygen until a certain amount of oxygen partial pressure reaches; after a reaction is carried out for a period of time, oxidizing trivalent arsenic in the solution into pentavalent arsenic. The method has the advantages that the process is simple, the operation is convenient, and conditions required by the reaction are all easy tomeet; special equipment is not needed for the reaction, and the required high-pressure kettle is very common in the industry; the reagent ferrite in use and oxygen are both common materials in the metallurgical industry, and are cheap in price and easy to obtain; in the implementation process, no other by-products are produced except trivalent iron, and complicated subsequent treatment processesare not needed.

Description

Technical field [0001] The present invention relates to the technical field of hazardous waste treatment, and more specifically, to a method for catalytically oxidizing high-concentration trivalent arsenic using ferrous ions. Background technique [0002] Arsenic is a toxic element, which is widely associated with non-ferrous metal minerals. Its elemental substances and compounds are highly toxic and carcinogenic. For decades, my country's non-ferrous metal industry has developed vigorously. While non-ferrous metal minerals have been extensively mined, the problem of arsenic pollution has also become more prominent. [0003] After passing through the non-ferrous smelting system, most of the arsenic enters the pyrometallurgical smelting slag, soot, wet smelting wastewater, waste residue and electrolytic anode mud. At present, the commonly used wet arsenic fixation methods, such as lime neutralization method, sulfide precipitation method, iron-arsenic co-precipitation method, scorod...

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
no application Login to View More
IPC IPC(8): C02F1/72C02F103/16C02F101/10
CPCC02F1/725C02F2101/103C02F2103/16
Inventor 刘志宏宋珂舟柯平超
Owner CENT SOUTH UNIV