CN104846195B - Method for recovering low-grade precious metal from mineral dressing tailings - Google Patents
Method for recovering low-grade precious metal from mineral dressing tailings Download PDFInfo
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Abstract
The invention relates to the technical field of mineral separation and discloses a method for recovering low-grade precious metals from mineral separation tailings. The method comprises the steps of tailing raw material flotation, Nielson concentrator reselection, Nielson tailing oxidation roasting pretreatment, roasted slag cyaniding leaching and the like, wherein gold is enriched into flotation concentrate through the tailing flotation, coarse-grained gold in the flotation concentrate is recycled again through the Nielson concentrator reselection, the Nielson tailing is pretreated through oxidation roasting, the treated roasted slag is subjected to cyaniding leaching process, and micro-fine-grained gold lost in the Nielson tailing is recycled. The invention realizes the gold recovery by stages and improves the gold recovery rate. The problem of low recovery rate of the precious metals in the flotation tailings by using the traditional process is solved, and the recovery rate of the precious metals is improved; gold concentrate and iron concentrate are produced simultaneously, so that the comprehensive utilization rate of tailings is improved; the method realizes zero discharge of solid waste, thoroughly solves the influence of the tailing pond on the surrounding environment, and eliminates pollution sources and potential safety hazards.
Description
Technical field
The present invention relates to technical field of beneficiation, specifically one kind can improve the noble metal response rate, mine tailing is realized
The method that low grade noble metal is reclaimed from milltailings of secondary resource comprehensive utilization.
Background technology
Mine tailing after China's smelter ore dressing is deposited in storehouse dam, easily causes the secondary disasters such as avalanche, mud-rock flow, environment
And security issues become increasingly urgent.The utilization rate of mine tailing is relatively low, causes the huge wasting of resources.With production technology and ore dressing skill
The development of art, recyclable multiple element, especially rare precious metals element from mine tailing.Recovery to useful constituent in mine tailing is comprehensive
Close and utilize, stock number not only can be expanded, ambient pressure can be also reduced.In today that mineral resources are day by day exhausted, mine tailing is realized
The comprehensive utilization of secondary resource is extremely urgent.
In recent years, domestic and international ore dressing worker has carried out substantial amounts of research work for the recovery of noble metal in milltailings
Make, mainly put forward the techniques such as gold to extract noble metal therein, above-mentioned extraction of gold process using flotation, gravity treatment, all sliming cyanidation charcoal slurry
There is a problem of that the response rate is low, the mine tailing of 1.0g/t is less than especially for gold content.
The content of the invention
It is an object of the invention to provide a kind of method that low grade noble metal is reclaimed from flotation tailing, existing to solve
The low problem of mine tailing ore-dressing technique noble metal gold recovery.
To solve above-mentioned technical problem, the technical solution used in the present invention is：
A kind of method that low grade noble metal is reclaimed from milltailings, it is characterised in that：It comprises the following steps：
Step one, mine tailing raw material flotation, by mine tailing raw pulp, hundred score concentration of ore pulp quality is 25%～35%, fully
3min is stirred after adding activator after stirring, 2min is stirred after adding collecting agent, foaming agent again in serosity, is given serosity Inflated floating
Choosing, Jing one roughings, once purging selection obtain rough concentrate and mine tailing, by the granular mass that rough concentrate ore grinding to granularity is -0.074mm
After degree is 75%～85%, carry out selected twice obtaining flotation concentrate and mine tailing；
Step one gained flotation concentrate is carried out gravity treatment by step 2, Knelson concentrator gravity treatment with Knelson concentrator, mill
Ore deposit fineness：It is that 75%～85%, water flow velocity is 2.4L/min～3.2L/ that granularity is the granular mass degree of -0.074mm
Min, gravity are 90 G～120G, and Jing sorts and obtain Gold Concentrate under Normal Pressure and Nelson's mine tailing, collect Gold Concentrate under Normal Pressure；
Step 3, Nelson's mine tailing oxidizing roasting pretreatment：Nelson's mine tailing obtained by step 2 is carried out into oxidizing roasting pre-
Process, sintering temperature is 700～900 DEG C, 3～4h of roasting, obtains slag and sulfur dioxide gas；
Slag obtained by step 3 is carried out Cyanide Leaching, mog for raw material by the Cyanide Leaching of step 4, slag：Grain
Spend the matter that the granular mass degree for -0.043mm is 85%～90%, extraction time 24h～36h, Cyanogran. and slag
Amount is than for 1000～3000g/t, liquid, mass ratio is 3～4 admittedly:1, Cyanide Leaching finally gives golden liquid and iron ore concentrate.
As a further improvement on the present invention, in the step one, activator and the mass ratio of mine tailing raw material are 200g/t,
It is 50～60g/t that the mass ratio of collecting agent and mine tailing raw material is the mass ratio of 200～250g/t, foaming agent and mine tailing raw material.
Used as the further improvement of the present invention, in the step one, activator is copper sulfate, and collecting agent is that isopentyl is yellow
Medicine, foaming agent are terpenic oil.
As the present invention further improvement, in the step one rough concentrate ore grinding ore pulp mass concentration be 50%～
60%。
The gold being lost in flotation tailing, is wrapped up by quartz mainly in microfine, it is impossible to reclaim.Using institute of the present invention
The method that low grade noble metal is reclaimed from flotation tailing stated, the recovery that can strengthen coarse grain and microfine noble metal in mine tailing are complete
Process, realizes that step is reclaimed.The mine tailing flotation of step one makes gold be enriched in flotation concentrate, the response rate up to more than 90%, step
Two again reclaim therein coarse gold using Knelson concentrator gravity separation method for flotation concentrate, and step 3 is adopted to Nelson's mine tailing
Cyaniding and leaching process carries out for the slag after process with oxidizing roasting pretreatment, step 4, recovery is lost in Nelson's mine tailing
In micro-fine-grained gold.The present invention stage by stage, it is comprehensive realize gold recovery, improve gold the response rate.
Sulfur mass percentage content >=5.0% in mine tailing, the sample ore of noble metal gold mass percentage content >=0.2g/t, adopts
Noble metal, golden overall recovery ＞ 58% are reclaimed with this method；Iron ore concentrate yield ＞ 11%, Iron grade ＞ 60%, sulfur-bearing ＜ 0.1%.Phase
Than only with " flotation-Nelson's ore-dressing technique ", golden overall recovery improves about 40%.
Beneficial effects of the present invention：
（1）The present invention adopts " flotation-flotation concentrate Nelson gravity treatment-Nelson's mine tailing oxidizing roasting pretreatment-cyanogen
Change and leach " process integration, solve the problems, such as that flotation tailing uses the traditional handicraft noble metal response rate low, improve noble metal
The response rate；
（2）This method can be in synthetical recovery mine tailing valuable minerals, while output Gold Concentrate under Normal Pressure and iron ore concentrate, improve tail
The comprehensive utilization ratio of ore deposit, improves economic benefit；
（3）It is quartz using the main mineral composition of flotation tailing obtained by the present invention, can be used as the raw material of building trade.This
Method is capable of achieving solid waste zero-emission, thoroughly solves impact of the Tailings Dam to surrounding enviroment, eliminates polluter and peace
Full hidden danger.
Description of the drawings
Fig. 1 is the process flow diagram of the present invention.
Specific embodiment
The present invention is further detailed explanation below in conjunction with the accompanying drawings.
Embodiment 1
Low grade noble metal therein, the matter of the mine tailing sulfur are reclaimed from Jiangxi flotation tailing using the method for the invention
It is 0.20g/t that amount degree is the golden mass ratio with mine tailing of 8.50%, noble metal.
Step one, mine tailing raw material flotation, by mine tailing raw pulp, hundred score concentration of ore pulp quality is 25%, after being sufficiently stirred for
Addition copper sulfate stirring 3min, copper sulfate is 200g/t with the mass ratio of mine tailing raw material, adds isoamyl xanthate, pine in serosity again
The mass ratio of the mass ratio for 200g/t, terpenic oil and mine tailing raw material of 2min, isoamyl xanthate and mine tailing raw material is stirred after alcohol oil
For 50g/t；Obtain rough concentrate and mine tailing to serosity air flotation, Jing one roughings, once purging selection, by rough concentrate ore grinding to granularity
For -0.074mm granular mass degree be 75% after, carry out selected twice obtaining flotation concentrate and mine tailing；Wherein flotation
In concentrate, sulfur grade is 45.50%, operation recovery 92.50%, and noble metal gold is 1.05g/t, work with the mass ratio of flotation concentrate
The industry response rate 90.72%；
Step one gained flotation concentrate is carried out gravity treatment by step 2, Knelson concentrator gravity treatment with Knelson concentrator, mill
Ore deposit fineness：Granularity be -0.074mm granular mass degree be 75%, water flow velocity be 2.4L/min, gravity be 90G, Jing
Sort and obtain Gold Concentrate under Normal Pressure and Nelson's mine tailing, the content of noble metal gold is 13.52g/t in gained Gold Concentrate under Normal Pressure, and operation recovery is
17.47%；
Step 3, Nelson's mine tailing oxidizing roasting pretreatment：Nelson's mine tailing obtained by step 2 is carried out into oxidizing roasting pre-
Process, sintering temperature is 700 DEG C, roasting 3h, obtains slag and sulfur dioxide gas, in gained slag, the content of gold is 1.29g/
T, weight of iron degree are 60.84%；
Slag obtained by step 3 is carried out Cyanide Leaching, mog for raw material by the Cyanide Leaching of step 4, slag：Grain
Spending the mass ratio that the granular mass degree for -0.043mm is 85%, extraction time 24h, Cyanogran. and slag is
The solid mass ratio of 1000g/t, liquid is 3:1, Cyanide Leaching finally gives golden liquid and iron ore concentrate.The content of gold in gained phase analysis
For 0.57g/t, gold leaching rate is 55.72%, and in phase analysis, the mass percentage content of ferrum is 60.84%, and the mass percent of sulfur contains
Measure as 0.08%, reach qualified iron ore concentrate requirement, iron ore concentrate yield 11.63%.
It is 58.69% using the overall recovery of gold in the method for the invention mine tailing.
Reference examples 1
Using traditional floatation, flotation pulp mass concentration percent is adjusted to into 25%, adds copper sulfate 200g/t, stirring
Add isoamyl xanthate 200g/t, terpenic oil 50g/t after 3min, air flotation after stirring 2min, is once swept Jing one roughings
Choosing, is 75% by granular mass degree that rough concentrate ore grinding to granularity is -0.074mm, it is selected twice after, what is obtained is floating
Concentrate selection, sulfur grade 45.50%, operation recovery 92.50% in gained flotation concentrate, gold are 1.05 with the mass ratio of flotation concentrate
G/t, operation recovery 90.72%.Compared with Example 1, it is impossible to obtain qualified Gold Concentrate under Normal Pressure.
Reference examples 2
Using Nelson's gravity separation method, it is 75% by the granular mass degree that mine tailing ore grinding to granularity is -0.074mm,
Water flow velocity is 2.4L/min, gravity value is 90G, and it is 0.57g/t, operation recovery that Jing sorts the content of gold in gained Gold Concentrate under Normal Pressure
1.52%, compared with Example 1, auri is not originally enriched with, it is impossible to obtain qualified Gold Concentrate under Normal Pressure.
Embodiment 2
Low grade noble metal therein, the matter of the mine tailing sulfur are reclaimed from Gansu flotation tailing using the method for the invention
It is 0.45g/t that amount degree is the content of 10.25%, noble metal gold.
Step one, mine tailing raw material flotation, by mine tailing raw pulp, hundred score concentration of ore pulp quality is 30%, after being sufficiently stirred for
Addition copper sulfate stirring 3min, copper sulfate is 200g/t with the mass ratio of mine tailing raw material, adds isoamyl xanthate, pine in serosity again
The mass ratio of the mass ratio for 200g/t, terpenic oil and mine tailing raw material of 2min, isoamyl xanthate and mine tailing raw material is stirred after alcohol oil
For 60g/t；Obtain rough concentrate and mine tailing to serosity air flotation, Jing one roughings, once purging selection, by rough concentrate ore grinding to granularity
For -0.074mm granular mass degree be 80% after, carry out selected twice obtaining flotation concentrate and mine tailing；Wherein flotation
In concentrate, sulfur grade is 45.80%, operation recovery 95.27%, and the content of noble metal gold is than for 1.98g/t, operation recovery
93.81%；
Step one gained flotation concentrate is carried out gravity treatment by step 2, Knelson concentrator gravity treatment with Knelson concentrator, mill
Ore deposit fineness：Granularity be -0.074mm granular mass degree be 80%, water flow velocity be 3.2L/min, gravity be 120G, Jing
Sort and obtain Gold Concentrate under Normal Pressure and Nelson's mine tailing, the content of noble metal gold is 16.63g/t in gained Gold Concentrate under Normal Pressure, and operation recovery is
23.54%；
Step 3, Nelson's mine tailing oxidizing roasting pretreatment：Nelson's mine tailing obtained by step 2 is carried out into oxidizing roasting pre-
Process, sintering temperature is 800 DEG C, roasting 4h, obtains slag and sulfur dioxide gas, in gained slag, the content of gold is 2.32g/
T, weight of iron degree are 61.27%；
Slag obtained by step 3 is carried out Cyanide Leaching, mog for raw material by the Cyanide Leaching of step 4, slag：Grain
Spending the mass ratio that the granular mass degree for -0.043mm is 90%, extraction time 24h, Cyanogran. and slag is
The solid mass ratio of 2000g/t, liquid is 3:1, Cyanide Leaching finally gives golden liquid and iron ore concentrate.The content of gold in gained phase analysis
For 0.75g/t, gold leaching rate is 67.68%, and in phase analysis, the mass percentage content of ferrum is 61.27%, and the mass percent of sulfur contains
Measure as 0.07%, reach qualified iron ore concentrate requirement, iron ore concentrate yield 13.91%.
It is 71.73% using the overall recovery of gold in the method for the invention mine tailing.
Reference examples 3
Using traditional floatation, flotation pulp mass concentration percent is adjusted to into 30%, adds copper sulfate 200g/t, stirring
Add isoamyl xanthate 200g/t, terpenic oil 60g/t after 3min, air flotation after stirring 2min, is once swept Jing one roughings
Choosing, is 80% by granular mass degree that rough concentrate ore grinding to granularity is -0.074mm, it is selected twice after, what is obtained is floating
Concentrate selection, sulfur grade 45.80%, operation recovery 95.27% in gained flotation concentrate, the content of gold is 1.98g/t, operation recovery
Rate 93.81%.Compared with Example 2, it is impossible to obtain qualified Gold Concentrate under Normal Pressure.
Reference examples 4
Using Nelson's gravity separation method, it is 80% by the granular mass degree that mine tailing ore grinding to granularity is -0.074mm,
Water flow velocity is 3.2L/min, gravity value is 120G, and it is 0.64g/t, operation recovery that Jing sorts the content of gold in gained Gold Concentrate under Normal Pressure
1.87%, compared with Example 2, auri is not originally enriched with, it is impossible to obtain qualified Gold Concentrate under Normal Pressure.
Embodiment 3
Low grade noble metal therein, the matter of the mine tailing sulfur are reclaimed from Xinjiang flotation tailing using the method for the invention
It is 0.78g/t that amount degree is the content of 12.42%, noble metal gold.
Step one, mine tailing raw material flotation, by mine tailing raw pulp, hundred score concentration of ore pulp quality is 35%, after being sufficiently stirred for
Addition copper sulfate stirring 3min, copper sulfate is 200g/t with the mass ratio of mine tailing raw material, adds isoamyl xanthate, pine in serosity again
The mass ratio of the mass ratio for 250g/t, terpenic oil and mine tailing raw material of 2min, isoamyl xanthate and mine tailing raw material is stirred after alcohol oil
For 60g/t；Obtain rough concentrate and mine tailing to serosity air flotation, Jing one roughings, once purging selection, by rough concentrate ore grinding to granularity
For -0.074mm granular mass degree be 85% after, carry out selected twice obtaining flotation concentrate and mine tailing；Wherein flotation
In concentrate, sulfur grade is 46.40%, operation recovery 96.87%, and the content of noble metal gold is 2.86g/t, operation recovery
95.07%；
Step one gained flotation concentrate is carried out gravity treatment by step 2, Knelson concentrator gravity treatment with Knelson concentrator, mill
Ore deposit fineness：Granularity be -0.074mm granular mass degree be 85%, water flow velocity be 3.2L/min, gravity be 120G, Jing
Sort and obtain Gold Concentrate under Normal Pressure and Nelson's mine tailing, the content of noble metal gold is 19.45g/t in gained Gold Concentrate under Normal Pressure, and operation recovery is
27.04%；
Step 3, Nelson's mine tailing oxidizing roasting pretreatment：Nelson's mine tailing obtained by step 2 is carried out into oxidizing roasting pre-
Process, sintering temperature is 900 DEG C, roasting 4h, obtains slag and sulfur dioxide gas, in gained slag, the content of gold is 3.44g/
T, weight of iron degree are 61.65%；
Slag obtained by step 3 is carried out Cyanide Leaching, mog for raw material by the Cyanide Leaching of step 4, slag：Grain
Spending the mass ratio that the granular mass degree for -0.043mm is 90%, extraction time 36h, Cyanogran. and slag is
The solid mass ratio of 3000g/t, liquid is 4:1, Cyanide Leaching finally gives golden liquid and iron ore concentrate.The content of gold in gained phase analysis
For 0.89g/t, gold leaching rate is 74.10%, and in phase analysis, the mass percentage content of ferrum is 61.65%, and the mass percent of sulfur contains
Measure as 0.06%, reach qualified iron ore concentrate requirement, iron ore concentrate yield 15.75%.
It is 78.56% using the overall recovery of gold in the method for the invention mine tailing.
Reference examples 5
Using traditional floatation, flotation pulp mass concentration percent is adjusted to into 30%, adds copper sulfate 200g/t, stirring
Add isoamyl xanthate 250g/t, terpenic oil 60g/t after 3min, air flotation after stirring 2min, is once swept Jing one roughings
Choosing, is 85% by granular mass degree that rough concentrate ore grinding to granularity is -0.074mm, it is selected twice after, what is obtained is floating
Concentrate selection, sulfur grade 46.40%, operation recovery 96.87% in gained flotation concentrate, the content of gold is 2.86g/t, operation recovery
Rate 95.07%.Compared with Example 3, it is impossible to obtain qualified Gold Concentrate under Normal Pressure.
Reference examples 6
Using Nelson's gravity separation method, it is 85% by the granular mass degree that mine tailing ore grinding to granularity is -0.074mm,
Water flow velocity is 3.2L/min, gravity value is 120G, and it is 0.85g/t, operation recovery that Jing sorts the content of gold in gained Gold Concentrate under Normal Pressure
2.76%, compared with Example 3, auri is not originally enriched with, it is impossible to obtain qualified Gold Concentrate under Normal Pressure.
As can be seen from the above-described embodiment, the present invention adopts " flotation-flotation concentrate Nelson gravity treatment-Nelson's mine tailing
Oxidizing roasting pretreatment-Cyanide Leaching " process integration, solves flotation tailing and uses the traditional handicraft noble metal response rate low
Problem, improves the response rate of noble metal, improves the comprehensive utilization ratio of mine tailing.
Claims (2)
1. it is a kind of from milltailings reclaim low grade noble metal method, it is characterised in that：It comprises the following steps：
Mine tailing raw pulp, hundred score concentration of ore pulp quality are 25%～35%, are sufficiently stirred for by step one, mine tailing raw material flotation
3min is stirred after adding activator afterwards, 2min is stirred after adding collecting agent, foaming agent again in serosity, is given serosity air flotation, Jing
One roughing, once purging selection obtain rough concentrate and mine tailing, by the granular mass percentage that rough concentrate ore grinding to granularity is -0.074mm
After being 75%～85% than content, carry out selected twice obtaining flotation concentrate and mine tailing；Wherein activator be copper sulfate, activator with
The mass ratio of mine tailing raw material is 200g/t；Collecting agent is isoamyl xanthate, the mass ratio of collecting agent and mine tailing raw material is 200～
250g/t；Foaming agent is terpenic oil, and foaming agent is 50～60g/t with the mass ratio of mine tailing raw material；
Step one gained flotation concentrate is carried out gravity treatment with Knelson concentrator by step 2, Knelson concentrator gravity treatment, and ore grinding is thin
Degree：It is that 75%～85%, water flow velocity is 2.4L/min～3.2L/min, weight that granularity is the granular mass degree of -0.074mm
Power is 90 G～120G, and Jing sorts and obtain Gold Concentrate under Normal Pressure and Nelson's mine tailing, collects Gold Concentrate under Normal Pressure；
Step 3, Nelson's mine tailing oxidizing roasting pretreatment：Nelson's mine tailing obtained by step 2 is carried out into oxidizing roasting pretreatment,
Sintering temperature is 700～900 DEG C, 3～4h of roasting, obtains slag and sulfur dioxide gas；
Slag obtained by step 3 is carried out Cyanide Leaching, mog for raw material by the Cyanide Leaching of step 4, slag：Granularity for-
The granular mass degree of 0.043mm is that the mass ratio of 85%～90%, extraction time 24h～36h, Cyanogran. and slag is
The solid mass ratio of 1000～3000g/t, liquid is 3～4:1, Cyanide Leaching finally gives golden liquid and iron ore concentrate.
2. it is according to claim 1 from milltailings reclaim low grade noble metal method, it is characterised in that：The step
In rapid one, rough concentrate ore grinding ore pulp mass concentration is 50%～60%.
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| CN106669963A (en) * | 2015-11-11 | 2017-05-17 | 沈阳有色金属研究院 | Pre-concentration method for ore separation of gold tailings |
| CN106216101B (en) * | 2016-08-04 | 2018-09-28 | 西北矿冶研究院 | Method for improving recovery rate of sulfur and gold in tailings of old tailings pond |
| CN107115959A (en) * | 2017-05-10 | 2017-09-01 | 吉林吉恩镍业股分有限公司 | The method that packed in gangue micro-fine-grained gold in mine tailing is reclaimed with Nelson's gravitational separation equipment |
| CN107326172B (en) * | 2017-05-23 | 2019-08-23 | 西北矿冶研究院 | Beneficiation method for high-carbon micro-fine particle microscopic gold ore |
| CN108300868A (en) * | 2018-01-12 | 2018-07-20 | 灵宝金源矿业股份有限公司 | A kind of method that gold ore leaches tailing high efficiente callback low content gold |
| CN113262872A (en) * | 2020-10-27 | 2021-08-17 | 水口山有色金属有限责任公司 | Method for reducing gold grade of gold-dressing tailings |
| CN114990335A (en) * | 2022-02-22 | 2022-09-02 | 玉门市昌源矿业有限公司 | Method for treating copper ions in ore pulp by adopting carbon pulp method |
| CN115433838A (en) * | 2022-08-15 | 2022-12-06 | 金川镍钴研究设计院有限责任公司 | Method for enriching precious metals by treating Nielsen concentrate through pyrogenic process |
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| US5127942A (en) * | 1990-09-21 | 1992-07-07 | Newmont Mining Corporation | Microbial consortium treatment of refractory precious metal ores |
| US5873927A (en) * | 1997-05-16 | 1999-02-23 | Echo Bay Mines, Limited | Integrated, tank/heap biooxidation process |
| CN1840717A (en) * | 2005-03-30 | 2006-10-04 | 张至德 | Process for producing gold by conglomeration, oxidizing roasting, and sodium cyanide leaching of primary gold ore |
| CN101332447A (en) * | 2008-08-06 | 2008-12-31 | 紫金矿业集团股份有限公司 | Mineral separation process capable of increasing gold recovery in gold tailings |
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