CN107779610A - A kind of method and device of ultrasonic combined stirring pretreatment refractory gold ore - Google Patents

Abstract

The invention discloses a method and device for pretreatment of refractory gold ore with ultrasonic combined stirring. The device includes a box body and a box cover arranged on the top of the box body. A group of ultrasonic vibrators are installed on the wall, and the ultrasonic vibrators are connected to the ultrasonic generator outside the box through wires. At the same time, a group of stirring platforms are fixedly installed at the bottom of the treatment tank. The stirring platforms are hollow structures, and the main shaft of the stirring motor penetrates into the stirring The back of the platform is fixedly connected with the permanent magnet in the stirring platform. The invention utilizes ultrasonic waves to generate transient cavitation, and the transient cavitation bubbles rapidly expand and contract, and local high temperature and high pressure will be generated in the bubbles, which will stimulate the generation of hydroxyl radicals in the water medium, effectively destroy the gold-coated minerals, and facilitate fine The disseminated gold is released to contact with the leaching agent, while saving the amount of oxidizing agent.

Description

A method and device for pretreatment of refractory gold ore with ultrasonic combined stirring

technical field

The invention relates to a method and a device for pretreating refractory gold ore with ultrasonic combined stirring, and belongs to the technical field of gold ore mining and dressing.

Background technique

Because gold has both financial, currency and commodity attributes, it is different from other metals and has become a very important strategic mineral. my country is rich in gold resources, and the gold deposits and ore spots are unevenly distributed across the country, but the distribution of each ore spot is relatively concentrated in the region. At present, it has formed Jiaodong area, Xiaoqinling area, Inner Mongolia area, Shaanxi-Gansu-Sichuan and Guizhou-Yunnan region. Many gold bases such as the Guangxi triangle area, among the proven gold reserves in my country, 30% are refractory gold mines.

The main type of gold deposits in the gold base in the Guizhou-Yunnan-Guizhou triangle area is fine disseminated gold deposits. The particle size of gold is small, and it is mainly wrapped gold. The gold-carrying minerals are pyrite, quartz, and carbonate rock minerals, which contain harmful elements such as organic carbon and arsenic.

The difficulty in beneficiation technology of low-grade fine disseminated primary gold ore is how to release the fine disseminated gold wrapped in pyrite and quartz to contact with the leaching agent, and at the same time eliminate the "gold-robbing effect" of organic carbon. At present, the industrial production pretreatment of this type of gold mine includes: roasting method, pressurized oxidation method, microbial oxidation method and chemical oxidation method. The roasting method pollutes the environment greatly, and is no longer suitable for production in today's strict environmental protection requirements. The pressurized oxidation method has strict requirements on the equipment, and the equipment needs to withstand high temperature and pressure, so the application is limited. Microbial oxidation has the characteristics of simple process and low cost, but the microbial culture cycle is long and the environment is not easy to control.

Contents of the invention

The purpose of the present invention is to provide a method and device for pretreatment of refractory gold ore with ultrasonic combined agitation, which combines chemical pretreatment and ultrasonic combined agitation to improve the leaching rate of fine disseminated low-grade refractory primary gold ore , and no pollution, high efficiency, easy to control conditions.

Technical solution of the present invention: a method for pretreatment of refractory gold ore with ultrasonic combined stirring, comprising the following steps:

(1) Crushing: Use a jaw crusher to crush the low-grade fine disseminated type refractory primary gold ore, then pass through a 1-2mm sieve, divide the sample into bags by quartering, put it in the refrigerator for low temperature storage, and store it for later use;

(2) Grinding: Take 200-500g of the crushed low-grade fine disseminated primary gold ore that is refractory to separation, add an appropriate amount of water according to the solid-to-liquid ratio of 1-3:1, and grind the ore in a ball mill at room temperature. Less than 0.074mm accounts for more than 95%, and the wet sampler is used to divide the sample;

(3) Ultrasonic combined stirring oxidation pretreatment: adjust the solid-liquid ratio of the ground sample in step (2) to 1:3-5, add 2-6kg/t oxidant at the same time, and use ultrasonic combined stirring to carry out oxidation pretreatment;

(4) Alkali pretreatment: adjust the solid-to-liquid ratio of the pulp in step (3) to 1:3-5, add sodium hydroxide in an amount of 10-20kg/t, and stir at the same time, and the pretreatment time is 5-10h;

(5) Leaching: Add non-cyanide leaching agent, the dosage is 5-10kg/t, and the leaching time is 1-4h.

In the above method, in the process of ultrasonic combined stirring and oxidation pretreatment, the ultrasonic frequency is 20-40KHz, the power is 100-180W, the stirring speed is 300r/min, the ultrasonic time is 10-200min, and the oxidation pretreatment time is 2-4h .

In the above method, the oxidizing agent is a mixture of ammonium persulfate and ferrous sulfate.

At the same time, the present invention also provides a device for pretreatment of refractory gold ore with ultrasonic combined stirring, which includes a box body and a box cover arranged on the top of the box body, a treatment tank is placed in the box body, and a treatment tank is placed on the bottom and side walls of the treatment tank. A group of ultrasonic vibrators are installed, and the ultrasonic vibrators are connected to the ultrasonic generator outside the box through wires. At the same time, a group of stirring platforms are fixedly installed at the bottom of the treatment tank. The stirring platforms are hollow structures, and the main shaft of the stirring motor penetrates the stirring platform. It is fixedly connected with the permanent magnet in the stirring platform.

The ultrasonic oscillators are arranged symmetrically on both sides of the stirring platform.

Four stoppers are uniformly fixed around the top of the stirring platform.

The top of the box cover is provided with a handle.

The stirring platform is an aluminum alloy structure.

Owing to adopting above-mentioned technical scheme, the advantage of the present invention is:

(1) Ultrasonic waves with strong sound intensity produce transient cavitation. The transient cavitation bubbles expand and contract rapidly, and local high temperature and high pressure will be generated in the bubbles, which will stimulate the generation of hydroxyl radicals in the water medium and effectively destroy the wrapped gold. Minerals, which facilitate the release of fine disseminated gold and contact with the leaching agent, while saving the amount of oxidant.

(2) Continuous stirring can dissolve more gas in the pulp, which will generate a large number of small bubbles, reduce the cavitation threshold, make cavitation more likely to occur, generate a large number of hydroxyl radicals, and accelerate the destruction of wrapped gold minerals , the non-cyanide leaching rate of 1.0-2.0g/t fine disseminated low-grade primary gold ore pretreated by this method can reach more than 80%.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the top view of the structural representation of treatment tank among the present invention;

Fig. 3 is a cross-sectional view of a schematic structural view of a treatment tank in the present invention.

Explanation of reference signs: 1-treatment tank; 2-cabinet; 3-ultrasonic vibrator; 4-permanent magnet; 5-block; 6-stirring motor; 7-box cover; 8-handle; 9-ultrasonic generator; 10-wire; 11-main switch; 12-stirring platform.

Detailed ways

In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

Referring to Figures 1 to 3, a device for pretreatment of refractory gold ore with ultrasonic combined stirring of the present invention includes a box body 2 and a box cover 7 arranged on the top of the box body 2, and a handle 8 is arranged on the top of the box cover 7. A treatment tank 1 is placed in the box body 2, and 36 ultrasonic vibrators 3 are installed on the bottom and side walls of the treatment tank 1, that is, 16 ultrasonic vibrators are installed on the bottom of the treatment tank 1, 6 on the front and back, and 4 on the left and right sides. The ultrasonic vibrator 3 is connected with the ultrasonic generator 9 outside the casing 2 through a wire 10, and a group of stirring platforms 12 are fixedly installed at the bottom of the treatment tank 1 at the same time. The stirring platforms 12 are hollow structures, and the main shaft of the stirring motor 6 passes through the After entering the stirring platform 12, it is fixedly connected with the permanent magnet 4 in the stirring platform 12. The ultrasonic oscillators 3 are symmetrically arranged on both sides of the stirring platform 12 . The stirring platform 12 is an aluminum alloy structure, and the stirring platform 12 is evenly fixed with four stop blocks 5 on the periphery of the top, which is convenient for placing the beaker in the middle of the four stop blocks 5, and prevents the beaker from moving during the stirring process, which is beneficial to gold mining. preprocessing. The stirring motor 6 is controlled by a master switch 11 on the outer wall of the casing 2 .

Example 1

A kind of ultrasonic combined stirring pretreatment method of refractory gold ore of the present invention comprises the following steps:

(1) Crushing: use a jaw crusher to crush the low-grade fine disseminated type refractory primary gold ore, then pass through a 1mm sieve, divide the samples into bags by quartering, put them in the refrigerator for low-temperature refrigeration, and reserve;

(2) Grinding: Take 200g of the crushed low-grade fine disseminated type refractory primary gold ore, add an appropriate amount of water according to the solid-to-liquid ratio of 1:1, and grind the ore in a ball mill at room temperature. The grinding fineness is less than 0.074mm More than 95%, using a wet sampler to divide the sample;

(3) Ultrasonic combined stirring oxidation pretreatment: add the ground sample in step (2) into the beaker, adjust the solid-liquid ratio of the ground sample to 1:3, and add 6kg/t ammonium persulfate and 2kg/t ferrous sulfate at the same time , and then use ultrasonic combined stirring to carry out oxidation pretreatment, start ultrasonic generator 9 and stirring motor 6, ultrasonic frequency is 30KHz, ultrasonic time is 150min, power is 120W, the stirring speed of stirring motor 6 is 300r/min, oxidation pretreatment time for 4h;

(4) Alkali pretreatment: adjust the solid-to-liquid ratio of the pulp in step (3) to 1:3, add 20kg/t sodium hydroxide, and stir at the same time, and the pretreatment time is 10h;

(5) Leaching: add 10kg/t non-cyanide leaching agent, leaching time is 1-4h, and finally obtain 86.15% gold leaching rate.

Example 2:

A kind of ultrasonic combined stirring pretreatment method of refractory gold ore of the present invention comprises the following steps:

(1) Crushing: use a jaw crusher to crush the low-grade fine disseminated type refractory primary gold ore, then pass through a 2mm sieve, divide the samples into bags by quartering, put them in the refrigerator for low temperature storage, and reserve;

(2) Grinding: Take 500g of the crushed low-grade fine disseminated primary gold ore that is refractory to separation, add an appropriate amount of water at a solid-to-liquid ratio of 1 to 3, and grind the ore in a ball mill at room temperature. The grinding fineness is less than 0.074mm. More than 95%, using a wet sampler to divide the sample;

(3) Ultrasonic combined stirring oxidation pretreatment: add the ground sample in step (2) into the beaker, adjust the solid-liquid ratio of the ground sample to 1:5, and add 6kg/t ammonium persulfate and 2kg/t ferrous sulfate at the same time , and then use ultrasonic combined stirring to carry out oxidation pretreatment, start ultrasonic generator 9 and stirring motor 6, ultrasonic frequency is 30KHz, ultrasonic time is 150min, power is 120W, the stirring speed of stirring motor 6 is 300r/min, oxidation pretreatment time for 4h;

(4) Alkali pretreatment: adjust the solid-to-liquid ratio of the pulp in step (3) to 1:5, add 20kg/t sodium hydroxide, and stir at the same time, and the pretreatment time is 10h;

(5) Leaching: add 10kg/t non-cyanide leaching agent, leaching time is 4h, finally obtain 82.85% gold leaching rate.

Claims (8)

1. A kind of 1. method of ultrasonic combined stirring pretreatment refractory gold ore, it is characterised in that comprise the following steps：

   (1) crush：Select primary gold ore stone to be crushed low-grade micro-fine disseminated type difficulty with jaw crusher, then cross 1~2mm Sieve, divide sample to pack with quartering, be put into refrigerator deepfreeze, standby；

   (2) ore grinding：The low-grade micro-fine disseminated type difficulty after crushing is taken to select primary gold ore 200~500g of stone, by 1~3:1 solid-to-liquid ratio Appropriate water is added, at room temperature the ore grinding in ball mill, mog accounts for more than 95% less than 0.074mm, divides sample using wet type Machine divides sample；

   (3) ultrasonic combined stirring oxidation pre-treatment：Ore grinding sample solid-to-liquid ratio is 1 in regulating step (2):3~5, while add 2 ~6kg/t oxidants, oxidation pre-treatment is carried out using ultrasonic combined stirring；

   (4) oxygenation pretreatment is added：It is 1 by ore pulp regulation solid-to-liquid ratio in step (3):3~5, add sodium hydroxide, dosage be 10~ 20kg/t, stir simultaneously, pretreatment time is 5~10h；

   (5) leach：Non- cyanogen leaching agent is added, dosage is 5~10kg/t, and extraction time is 1~4h.
2. 2. the method for ultrasonic combined stirring pretreatment refractory gold ore according to claim 1, it is characterised in that：The oxygen Ultrasonic frequency be 20~40KHz during changing pretreatment, and power is 100~180W, speed of agitator 300r/min, ultrasonic The ripple time is 10~200min, and the oxidation pre-treatment time is 2~4h.
3. 3. the method for ultrasonic combined stirring pretreatment refractory gold ore according to claim 1, it is characterised in that：The oxygen Agent is the mixture of ammonium persulfate and ferrous sulfate.
4. 4. a kind of device of ultrasonic combined stirring pretreatment refractory gold ore, including casing (2) and it is arranged at the top of casing (2) Case lid (7), it is characterised in that：Treatment trough (1) is placed with casing (2), is pacified on the bottom for the treatment of trough (1) and side wall Equipped with one group of ultrasonic oscillator (3), ultrasonic oscillator (3) is connected by the supersonic generator (9) of wire (10) and casing (2) outside Connect, while one group of stirring platform (12) is installed with the bottom for the treatment of trough (1), the stirring platform (12) is hollow knot Structure, the main shaft of stirring motor (6) penetrate stirring platform (12) and are fixedly connected afterwards with the permanent magnet (4) in stirring platform (12).
5. 5. the device of ultrasonic combined stirring pretreatment refractory gold ore according to claim 4, it is characterised in that：It is described super Acoustic wave transducer (3) is symmetrically disposed in stirring platform (12) both sides.
6. 6. the device of ultrasonic combined stirring pretreatment refractory gold ore according to claim 4, it is characterised in that：It is described to stir Mix the periphery at the top of platform (12) and be equably fixed with four link stoppers (5).
7. 7. the device of ultrasonic combined stirring pretreatment refractory gold ore according to claim 4, it is characterised in that：Described Handle (8) is provided with the top of case lid (7).
8. 8. the device of ultrasonic combined stirring pretreatment refractory gold ore according to claim 4, it is characterised in that：It is described to stir It is aluminium alloy structure to mix platform (12).