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Method for preparing oxidation catalyst from gold ore tailing slag, and prepared oxidation catalyst and application thereof

A technology for oxidation catalyst and gold mine tailings, which is applied in the field of solid waste recycling, can solve the problems of continuous operation of unfavorable catalyst recycling production process, difficulty in achieving standard discharge, loss of catalyst components, etc. Increased speed, low cost effect

Inactive Publication Date: 2012-07-18
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Advanced oxidation technology has been widely used in industrial wastewater and domestic sewage treatment, but it still has some shortcomings: 1. Advanced oxidation technology is currently based on solution homogeneous reaction. Although it has a certain treatment effect, there are catalyst groups after the reaction. 2. The chemical oxygen demand (Chemical Oxygen Demand, abbreviated as COD) of wastewater mother liquid in chemical industry and other related industries is high and complex, and traditional advanced oxidation technology The oxidation efficiency of its treatment is low, and it is difficult to achieve standard discharge

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] At 25°C, take 2g of gold ore tailings slag and grind it to 200 mesh, stir it in 100ml of 0.01mol / L hydrochloric acid solution for 12h, wash it with water until neutral, and then soak it in 1mol / L ferrous sulfate solution, Mix well under the protection of argon, perform ion exchange adsorption at 50°C for 12 hours, filter, collect and wash the filter cake. Put the filter cake into water, slowly add 1 mol / L sodium hydroxide solution dropwise, adjust the pH value to 9, react for 6 hours, then filter with suction and wash the product until neutral to obtain a filter cake loaded with iron hydroxy, bake at 60°C Dry for 6 hours, and then calcined in a muffle furnace at 550° C. for 4 hours at a heating rate of 10° C. / min to obtain an oxidation catalyst loaded with nano-iron oxide.

[0034] The plasma mass spectrometry analysis of the oxidation catalyst prepared in this embodiment shows that the iron content is 3.25mmol / g, and the specific surface area measured by mercury intrus...

Embodiment 2

[0037]At 25°C, take 2g of gold ore tailings slag and grind it to 50 mesh, stir it in 100ml of 0.01mol / L hydrochloric acid solution for 12h, wash it with water until neutral, and then soak it in 1mol / L ferrous nitrate solution, Mix well under the protection of argon, perform ion exchange adsorption at 50°C for 12 hours, filter, collect and wash the filter cake. Add the filter cake into water, slowly add 1mol / L sodium hydroxide solution dropwise, first adjust the pH value to 9, react for about 30 minutes, then continue to add lye until the pH value reaches 13, react for 4 hours, then filter and wash with water The product was neutralized to obtain a filter cake loaded with hydroxyl iron, which was dried at 60°C for 6 hours, and then calcined in a muffle furnace at 550°C for 4 hours at a heating rate of 10°C / min to obtain an oxidation catalyst loaded with nanometer iron oxide.

[0038] Add 3 g of the oxidation catalyst prepared in this example and 5 ml of hydrogen peroxide with a...

Embodiment 3

[0040] At 25°C, take 2g of gold ore tailings slag and grind it to 200 mesh, stir it in 100ml of 0.01mol / L hydrochloric acid solution for 12h, wash it with water until neutral, and then soak it in 1mol / L ferrous sulfate solution, Mix well under the protection of argon, perform ion exchange adsorption at 50°C for 12 hours, filter, collect and wash the filter cake. Add the filter cake into water, slowly add 1mol / L potassium hydroxide solution dropwise, first adjust the pH value to 9, continue to add lye dropwise after reacting for about 30 minutes, until the pH reaches 13, react for 4 hours, then suction filter and wash the product to Neutral to obtain a filter cake loaded with hydroxyl iron, dried at 80°C for 4h, and then calcined in a muffle furnace at 550°C for 2h at a heating rate of 10°C / min to obtain an oxidation catalyst loaded with nano-iron oxide.

[0041] Add 5 g of the oxidation catalyst prepared in this example and 5 ml of hydrogen peroxide with a mass fraction of 30%...

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Abstract

The invention provides a method for preparing an oxidation catalyst from gold ore tailing slag, and a prepared oxidation catalyst and application thereof. The method comprises the following steps of: crushing the slag into particles of 50-200 meshes, and performing acid washing treatment; mixing the treated slag with a ferrous slat solution in an inert gas protection atmosphere, performing ion exchange adsorption, and then filtering and washing a filter cake; impregnating the obtained filter cake in water, and adding an alkali liquor to adjust the pH to alkalinity so that iron ions react in situ on the surface of the filter cake to obtain the filter cake loaded with hydroxyl iron; activating the filter cake loaded with the hydroxyl iron to obtain the oxidation catalyst loaded with nano-ferric oxide. The method provided by the invention is simple and convenient, moderate in reaction conditions, low in cost and friendly to the environment; the catalyst prepared by the method disclosed by the invention contains components which are not easy to loss and is high in oxidation; and therefore, the catalyst is suitable for treating various kinds of industrial waste water, especially dye waste water mother liquor which is high in COD (Chemical Oxygen Demand), low in pH value, high in salinity, and difficult to degrade and oxidize.

Description

technical field [0001] The invention relates to the technical field of solid waste recycling, in particular to a method for preparing an oxidation catalyst from gold ore tailings slag, the catalyst and its application. Background technique [0002] Tailings slag is the ore residue after refining. As a relatively common industrial solid waste, its treatment and placement has increasingly become a difficult problem in industrial production. There are more than 400 large and small tailing ponds in my country, and the amount of tailings piled up has reached 5 billion tons, and the annual output of 500 million tons of tailings is increasing. Due to the decreasing grade of available metal ore, the scale of beneficiation is increasing, resulting in a sharp increase in the accumulation of slag. In addition, due to the technical limitations of the metallurgical process, there are still a large number of unextracted metal elements in the discarded slag, and some toxic heavy metals su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745B01J35/10C02F1/72
Inventor 黄梅张敏东韦彦斐陈圣福赵坤孙福成裘知
Owner ZHEJIANG UNIV
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