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Method for achieving Fenton-ultrasonic combined treatment on gold-bearing tailings

A combined treatment and ultrasonic technology, applied in the direction of improving process efficiency, can solve the problems of increasing the process of tailings gold pretreatment, secondary pollution of the environment, and increasing production costs, so as to achieve non-toxic treatment process, low equipment investment, The effect of enhancing the leaching effect

Active Publication Date: 2018-07-13
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although magnetic fluid separation does not pollute the environment, it is limited to the selection of placer gold and replaces amalgamation operations. Because it is limited to the selection of placer gold, and the processing volume is too small and the cost is high, it has only been tried in individual mines.
[0005] The literature "Experimental Research on the Re-selection of Fine-grained Tailings in the Process of Molybdenum Separation by Ultrasonic on Flotation Columns" proposes that the removal of hydroxides on the surface of minerals through ultrasonic crushing operations can accelerate the flotation rate and enhance the adsorption capacity of chemicals, but only Ultrasound is used for pretreatment, which increases the pretreatment process of tailings gold, and does not directly use ultrasonic waves for leaching of tailings gold. Traditional drug flotation is still used, which takes a long time for leaching and causes secondary pollution to the environment.
The document "Precious metal recovery from waste printed circuit boards using cyanide and non-cyanidelixiviants" proposes that adding a certain amount of thiourea is beneficial to the leaching of gold. The leaching of gold by thiourea method has the advantages of non-toxicity, high leaching rate and fast leaching speed, but Because thiourea itself is unstable and reacts with metal ions such as copper, it consumes a lot in the leaching process and increases the production cost. Therefore, this method has not been widely used in actual production so far.

Method used

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  • Method for achieving Fenton-ultrasonic combined treatment on gold-bearing tailings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Get some gold-containing tailings after a certain grinding in Shaanxi Province and carry out 80 mesh screen screening, take by weighing 4 grams and put into the reaction vessel, the prepared Fenton's reagent (the mass concentration of ferrous sulfate heptahydrate solution is 25%, add The volume is 2.5L / kg 尾矿 ; The mass concentration of hydrogen peroxide solution is 35%, and its addition amount is 6.5L / kg 尾矿 ) according to the mineral liquid ratio of 1kg:7.8L, pour it into the reaction vessel, stir it continuously to make it fully react, then put it into the ultrasonic equipment, and ultrasonically leach for about 30 minutes with a power of 500W, collect the precious liquid and add 10% dilute nitric acid to adjust the precious liquid The leaching rate of tailings gold can reach 84%. Collect 10% dilute nitric acid of your liquid to adjust the pH of your liquid to 1.0-2.5 for subsequent treatment.

Embodiment 2

[0031] Get some high-silicon gold-containing tailings, screen through a 100-mesh sieve after grinding, take 30g and put it into a reaction vessel, and prepare Fenton's reagent (the mass concentration of ferrous sulfate heptahydrate solution is 25%, Adding amount is 2.2L / kg 尾矿 ; The mass concentration of hydrogen peroxide solution is 35%, and its addition amount is 5.8L / kg 尾矿 ) according to the ratio of mineral liquid 1kg:8L into the reaction container and stir it continuously to make it fully react. Then put the reacted ore slurry into the ultrasonic equipment, ultrasonicate with 360W power for 0.6h, collect the precious liquid and add 10% dilute nitric acid to adjust the pH of the precious liquid to 1.5-2.5, add a small amount of dilute nitric acid to ensure the stability of the precious liquid, and its leaching The rate is as high as 87%.

Embodiment 3

[0033] Take some high-silicon gold-containing tailings in Shaanxi, pass through a 100-mesh sieve after grinding, weigh 40g and put it into a reaction container. The prepared Fenton's reagent is---the mass concentration of ferrous sulfate heptahydrate solution is 25%, and the addition amount is 3.5L / kg 尾矿 ; The mass concentration of hydrogen peroxide solution is 30%, and its addition amount is 7.1L / kg 尾矿 . According to the ratio of mineral liquid 1kg:7.8L, pour it into the reaction container and stir continuously to make it fully react. Then add 900mg of thiourea and stir the slurry into an ultrasonic device, and ultrasonicate for 0.5h with a power of 400W to collect the precious liquid and add 10% dilute nitric acid to adjust the pH of the precious liquid to 1.0-2.0, and the leaching rate is as high as 90%.

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Abstract

The invention provides a method for achieving Fenton-ultrasonic combined treatment on gold-bearing tailings, and belongs to the field of colored precious metal recycling. The method specifically comprises the following steps that the gold-bearing tailings are sieved after being ground, then a Fenton reagent of a certain quantity and a certain ratio is added, then ultrasonic activation leaching iscarried out after reacting is carried out in a table concentrator for a period of time, and the ultrasonic times and powers of the gold-bearing tailings and the adding ratios of the Fenton reagent aredifferent according to the different grades of gold in the gold-bearing tailings. According to the method, the gold grade can be 2 g / t or above, and the leaching rate can reach 65%-90%.

Description

technical field [0001] The invention relates to the treatment of silicon-coated gold tailings, in particular to a method for using Fenton-ultrasonic joint treatment of gold-containing tailings. Background technique [0002] Due to its excellent performance, gold has been widely used in modern high-tech industries such as electronics, communications, aerospace, chemical industry, and medical treatment. As the human demand for gold continues to increase, there are fewer and fewer gold resources that are easy to mine on the earth, so it is particularly important to efficiently recover gold from gold-bearing tailings. However, the gold in the tailings is often wrapped by the same fine-grained gangue minerals in the form of fine particles, so it is difficult to be efficiently recovered by the conventional easy-to-mine mineral treatment process, resulting in serious pollution and waste. [0003] So far, the commonly used methods for resource recovery of tailings include gravity s...

Claims

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Application Information

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IPC IPC(8): C22B11/00C22B3/04
CPCC22B3/04C22B11/04Y02P10/20
Inventor 郭军康任倩陈乐任心豪花莉贾红磊李艳萍吕欣
Owner SHAANXI UNIV OF SCI & TECH