CN104263962A - Method for extracting gold from pyrrhotite - Google Patents
Method for extracting gold from pyrrhotite Download PDFInfo
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- CN104263962A CN104263962A CN201410490223.0A CN201410490223A CN104263962A CN 104263962 A CN104263962 A CN 104263962A CN 201410490223 A CN201410490223 A CN 201410490223A CN 104263962 A CN104263962 A CN 104263962A
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Abstract
The invention relates to the technical field of wet metallurgy and particularly relates to a method for extracting gold from pyrrhotite. Through control on redox potential in a solution in a pretreatment step of pyrrhotite, the redox potential in the solution is maintained below 450mv, thus the removal rate of surface substances of the pyrrhotite reaches over 85%, and meanwhile, the loss ratio of gold in the pretreatment step is also reduced by no more than 0.1%; therefore, the extraction rate of the gold extracted from the pyrrhotite is ensured, the gold extraction cost is also reduced, and the environmental pollution caused by the gold extraction process is lowered.
Description
Technical field
The present invention relates to technical field of wet metallurgy, especially a kind of method extracting gold from pyrrhotite.
Background technology
Gold, gives birth to along with mineral, as sulfide gold mine, specifically can be divided into the ore resource such as pyrite, pyrrhotite, arsenical pyrite.Further, the existing forms of gold in ore is mainly submicron-sized particulate and iron ore is combined closely, and this submicron-sized particulate is tiny of time micro-grade, and then make most gold be embedded in the molecular lattice of ore, forms with ore the body that dissolves each other; This feature makes ore when by mechanical mill or pulverizing, be crushed to maximum fineness in time to be also difficult to gold is come out from ore, especially the gold in pyrrhotite is attracted in crystal inside grid and is more difficult to come out, and then be difficult to the gold grain forming free surface, when causing taking solution to leach, make liquid medicine be difficult to contact with the surface of gold, be also just difficult to the biochemical reaction with golden hair and dissolved.
For this reason, there is investigator just by research, by outside exposed for the gold in sulfide ore, namely by pre-treatment step, gold is out exposed, but when taking such measure, what often adopt is that the technology of redox reaction is carried out, and then will potential be formed in the solution, and according to general knowledge, different potential will draw different reaction results, or the reaction product drawn and raw material consumption thing all different, and then how by ore, especially pyrrhotite ore carries out pre-treatment, a large amount of gold is made out to be become by exposed the crucial problem extracting gold from pyrrhotite.
Based on above-mentioned technical problem, this investigator is by a large amount of research and discoveries, the new selection carried out for the technique extracting gold from pyrrhotite and exploratory development, for enable the gold in pyrrhotite a large amount of by out exposed, and then provide basis for follow-up leaching, enrichment, separation, and then reduce the cost extracting gold from pyrrhotite and provide a kind of new approaches.
Summary of the invention
In order to solve the above-mentioned technical problem existed in prior art, the invention provides a kind of method extracting gold from pyrrhotite, there is the Surface of Pyrrhotite material that can make, namely sulphur arsenic material is reached more than 85% by extrusion rate, and the golden rate of loss in pyrrhotite can be made to be less than millesimal feature.
Be achieved particular by following technical scheme:
From pyrrhotite, extract a method for gold, comprise the following steps:
(1) pre-treatment: pyrrhotite is placed in pulverizer and is crushed to 300-400 order, obtain pyrrhotite powder, and be placed in pretreatment pool, add the salpeter solution of pyrrhotite powder 1-3 times of weight more wherein, and adopt the stirring velocity of agitator to be 40-70r/min stir process 1-2h, add the Sodium Nitrite of salpeter solution 0.7-0.9 times weight more wherein, and after continuing stir process 20-30min, being placed on temperature is leave standstill process 10-20min in 60-70 DEG C, add hydrogen peroxide wherein again, wherein the consumption of hydrogen peroxide is 1-1.3 times of nitrous acid weight, and to control solution temperature be after 50-60 DEG C, again using mercurous chloride electrode as reference electrode, potential in measuring point solution, and the potential in solution is adjusted and controls at≤450mV, after making its sustained reaction 3-4h, obtain pre-treatment slip, stand-by,
(2) Leaching of Gold: by step 1) slip that obtains of pre-treatment adds water process of sizing mixing, wherein the amount ratio of slip and water is (2-4): (0.5-1.5), add the hydrochloric acid that volumetric molar concentration is 2mol/l more wherein, hydrochloric acid consumption is 1-2 times of slip weight, and be after 30-60r/min stir process 20-30min with stirring velocity, add the Losantin of the 4-6% of slip weight more wherein, and to adjust stirring velocity be after 80-120r/min stir process 1-3h, the temperature adjusting solution is again 70-90 DEG C, after leaving standstill process 0.5-1.5h, filter, obtain filtrate and filter residue,
(3) enrichment: by step 2) filtrate that obtains is placed in reaction tank, and in reaction tank, add hydrochloric acid consumption 1-2 basic anionic resin solution doubly, and employing stirring speed is after 50-60r/min stir process 1-3h, and filtration treatment is carried out to it, obtain filtrate a and filter residue a, filtrate a returns step 1) carry out circular treatment, filter residue a is stand-by;
(4) be separated: filter residue a is placed in and resolves groove, and add the 1-3 thiourea solution doubly of filter residue a weight wherein, and employing stirring speed is after 60-80r/min stir process 30-60min, add reductive agent more wherein and carry out reduction treatment, and when reduction treatment, the temperature that adjustment is resolved in groove is 80-90 DEG C, be after 80-90r/min stir process 20-30min with stirring velocity, filter, obtaining filtrate b and filter residue b, filter residue b is bronze; Filtrate b returns step 1) carry out circular treatment, can complete and extract gold from pyrrhotite.
The concentration of described salpeter solution is 2-3mol/l.
Described Sodium Nitrite is 300-400 object powder.
Described Losantin is 300-400 object powder.
Described basic anionic resin solution is-N (CH
3)
3oH.
Described-N (CH
3)
3the volumetric molar concentration of OH is 1-3mol/l.
The volumetric molar concentration of described thiourea solution is 1-2mol/l.
Compared with prior art, technique effect of the present invention is embodied in:
1. pass through in pyrrhotite pre-treatment step, in solution, redox-potential current potential controls, the redox potential in solution is made to maintain below 450mv, and then make Surface of Pyrrhotite material be reached more than 85% by extrusion rate, also reduce gold simultaneously and be no more than thousandth in the rate of loss of pre-treatment step, and then ensure that extract Au plasma rate from pyrrhotite, also reduce the cost extracting gold, and reduce the environmental pollution of extracting gold process and bringing.
2. the processing step of extraction gold of the present invention is brief, with short production cycle, and the content of preserving capital is comparatively large, makes Au plasma rate higher, reduces the cost that gold extracts.
Embodiment
Below in conjunction with concrete embodiment, further restriction is done to technical scheme of the present invention, but claimed scope is not only confined to done description.
Embodiment 1
From pyrrhotite, extract a method for gold, comprise the following steps:
(1) pre-treatment: pyrrhotite is placed in pulverizer and is crushed to 300 orders, obtain pyrrhotite powder, and be placed in pretreatment pool, add the salpeter solution of pyrrhotite powder 1 times of weight more wherein, and adopt the stirring velocity of agitator to be 40r/min stir process 1h, add the Sodium Nitrite of salpeter solution 0.7 times of weight more wherein, and after continuing stir process 20min, being placed on temperature is leave standstill process 10min in 60 DEG C, add hydrogen peroxide wherein again, wherein the consumption of hydrogen peroxide is 1 times of nitrous acid weight, and to control solution temperature be after 50 DEG C, again using mercurous chloride electrode as reference electrode, potential in measuring point solution, and the potential in solution is adjusted and controls at 450mV, after making its sustained reaction 3h, obtain pre-treatment slip, stand-by,
(2) Leaching of Gold: by step 1) slip that obtains of pre-treatment adds water process of sizing mixing, wherein the amount ratio of slip and water is 2:0.5, add the hydrochloric acid that volumetric molar concentration is 2mol/l more wherein, hydrochloric acid consumption is 1 times of slip weight, and be after 30r/min stir process 20min with stirring velocity, add the Losantin of 4% of slip weight more wherein, and to adjust stirring velocity be after 80r/min stir process 1h, the temperature adjusting solution is again 70 DEG C, after leaving standstill process 0.5h, filter, obtain filtrate and filter residue;
(3) enrichment: by step 2) filtrate that obtains is placed in reaction tank, and in reaction tank, add the basic anionic resin solution of hydrochloric acid consumption 1 times, and employing stirring speed is after 50r/min stir process 1h, and filtration treatment is carried out to it, obtain filtrate a and filter residue a, filtrate a returns step 1) carry out circular treatment, filter residue a is stand-by;
(4) be separated: filter residue a is placed in and resolves groove, and add the thiourea solution of 1 times of filter residue a weight wherein, and employing stirring speed is after 60r/min stir process 30min, add reductive agent more wherein and carry out reduction treatment, and when reduction treatment, the temperature that adjustment is resolved in groove is 80 DEG C, be after 80r/min stir process 20min with stirring velocity, filter, obtaining filtrate b and filter residue b, filter residue b is bronze; Filtrate b returns step 1) carry out circular treatment, can complete and extract gold from pyrrhotite.
The concentration of described salpeter solution is 2mol/l.
Described Sodium Nitrite is 300 object powder.
Described Losantin is 300 object powder.
Described basic anionic resin solution is-N (CH
3)
3oH.
Described-N (CH
3)
3the volumetric molar concentration of OH is 1mol/l.
The volumetric molar concentration of described thiourea solution is 1mol/l.
Embodiment 2
From pyrrhotite, extract a method for gold, comprise the following steps:
(1) pre-treatment: pyrrhotite is placed in pulverizer and is crushed to 400 orders, obtain pyrrhotite powder, and be placed in pretreatment pool, add the salpeter solution of pyrrhotite powder 3 times of weight more wherein, and adopt the stirring velocity of agitator to be 70r/min stir process 2h, add the Sodium Nitrite of salpeter solution 0.9 times of weight more wherein, and after continuing stir process 30min, being placed on temperature is leave standstill process 20min in 70 DEG C, add hydrogen peroxide wherein again, wherein the consumption of hydrogen peroxide is 1.3 times of nitrous acid weight, and to control solution temperature be after 60 DEG C, again using mercurous chloride electrode as reference electrode, potential in measuring point solution, and the potential in solution is adjusted and controls at 440mV, after making its sustained reaction 4h, obtain pre-treatment slip, stand-by,
(2) Leaching of Gold: by step 1) slip that obtains of pre-treatment adds water process of sizing mixing, wherein the amount ratio of slip and water is 4:1.5, add the hydrochloric acid that volumetric molar concentration is 2mol/l more wherein, hydrochloric acid consumption is 2 times of slip weight, and be after 60r/min stir process 30min with stirring velocity, add the Losantin of 6% of slip weight more wherein, and to adjust stirring velocity be after 120r/min stir process 3h, the temperature adjusting solution is again 90 DEG C, after leaving standstill process 1.5h, filter, obtain filtrate and filter residue;
(3) enrichment: by step 2) filtrate that obtains is placed in reaction tank, and in reaction tank, add the basic anionic resin solution of hydrochloric acid consumption 2 times, and employing stirring speed is after 60r/min stir process 3h, and filtration treatment is carried out to it, obtain filtrate a and filter residue a, filtrate a returns step 1) carry out circular treatment, filter residue a is stand-by;
(4) be separated: filter residue a is placed in and resolves groove, and add the thiourea solution of 3 times of filter residue a weight wherein, and employing stirring speed is after 80r/min stir process 60min, add reductive agent more wherein and carry out reduction treatment, and when reduction treatment, the temperature that adjustment is resolved in groove is 90 DEG C, be after 90r/min stir process 30min with stirring velocity, filter, obtaining filtrate b and filter residue b, filter residue b is bronze; Filtrate b returns step 1) carry out circular treatment, can complete and extract gold from pyrrhotite.
The concentration of described salpeter solution is 3mol/l.
Described Sodium Nitrite is 400 object powder.
Described Losantin is 400 object powder.
Described basic anionic resin solution is-N (CH
3)
3oH.
Described-N (CH
3)
3the volumetric molar concentration of OH is 3mol/l.
The volumetric molar concentration of described thiourea solution is 2mol/l.
Embodiment 3
From pyrrhotite, extract a method for gold, comprise the following steps:
(1) pre-treatment: pyrrhotite is placed in pulverizer and is crushed to 350 orders, obtain pyrrhotite powder, and be placed in pretreatment pool, add the salpeter solution of pyrrhotite powder 2 times of weight more wherein, and adopt the stirring velocity of agitator to be 55r/min stir process 1.5h, add the Sodium Nitrite of salpeter solution 0.8 times of weight more wherein, and after continuing stir process 25min, being placed on temperature is leave standstill process 15min in 65 DEG C, add hydrogen peroxide wherein again, wherein the consumption of hydrogen peroxide is 1.1 times of nitrous acid weight, and to control solution temperature be after 55 DEG C, again using mercurous chloride electrode as reference electrode, potential in measuring point solution, and the potential in solution is adjusted and controls at 430mV, after making its sustained reaction 3.5h, obtain pre-treatment slip, stand-by,
(2) Leaching of Gold: by step 1) slip that obtains of pre-treatment adds water process of sizing mixing, wherein the amount ratio of slip and water is 3:1, add the hydrochloric acid that volumetric molar concentration is 2mol/l more wherein, hydrochloric acid consumption is 1.5 times of slip weight, and be after 45r/min stir process 25min with stirring velocity, add the Losantin of 5% of slip weight more wherein, and to adjust stirring velocity be after 100r/min stir process 2h, the temperature adjusting solution is again 80 DEG C, after leaving standstill process 1h, filter, obtain filtrate and filter residue;
(3) enrichment: by step 2) filtrate that obtains is placed in reaction tank, and in reaction tank, add the basic anionic resin solution of hydrochloric acid consumption 1.5 times, and employing stirring speed is after 55r/min stir process 2h, and filtration treatment is carried out to it, obtain filtrate a and filter residue a, filtrate a returns step 1) carry out circular treatment, filter residue a is stand-by;
(4) be separated: filter residue a is placed in and resolves groove, and add the thiourea solution of 2 times of filter residue a weight wherein, and employing stirring speed is after 70r/min stir process 45min, add reductive agent more wherein and carry out reduction treatment, and when reduction treatment, the temperature that adjustment is resolved in groove is 85 DEG C, be after 85r/min stir process 25min with stirring velocity, filter, obtaining filtrate b and filter residue b, filter residue b is bronze; Filtrate b returns step 1) carry out circular treatment, can complete and extract gold from pyrrhotite.
The concentration of described salpeter solution is 2.5mol/l.
Described Sodium Nitrite is 350 object powder.
Described Losantin is 370 object powder.
Described basic anionic resin solution is-N (CH
3)
3oH.
Described-N (CH
3)
3the volumetric molar concentration of OH is 2mol/l.
The volumetric molar concentration of described thiourea solution is 1.5mol/l.
Embodiment 4
From pyrrhotite, extract a method for gold, comprise the following steps:
(1) pre-treatment: pyrrhotite is placed in pulverizer and is crushed to 370 orders, obtain pyrrhotite powder, and be placed in pretreatment pool, add the salpeter solution of pyrrhotite powder 2.3 times of weight more wherein, and adopt the stirring velocity of agitator to be 60r/min stir process 1.7h, add the Sodium Nitrite of salpeter solution 0.85 times of weight more wherein, and after continuing stir process 27min, being placed on temperature is leave standstill process 13min in 69 DEG C, add hydrogen peroxide wherein again, wherein the consumption of hydrogen peroxide is 1.2 times of nitrous acid weight, and to control solution temperature be after 59 DEG C, again using mercurous chloride electrode as reference electrode, potential in measuring point solution, and the potential in solution is adjusted and controls at 400mV, after making its sustained reaction 3.3h, obtain pre-treatment slip, stand-by,
(2) Leaching of Gold: by step 1) slip that obtains of pre-treatment adds water process of sizing mixing, wherein the amount ratio of slip and water is 3.3:1.3, add the hydrochloric acid that volumetric molar concentration is 2mol/l more wherein, hydrochloric acid consumption is 1.7 times of slip weight, and be after 39r/min stir process 23min with stirring velocity, add the Losantin of 5.3% of slip weight more wherein, and to adjust stirring velocity be after 110r/min stir process 2.5h, the temperature adjusting solution is again 75 DEG C, after leaving standstill process 1.1h, filter, obtain filtrate and filter residue;
(3) enrichment: by step 2) filtrate that obtains is placed in reaction tank, and in reaction tank, add the basic anionic resin solution of hydrochloric acid consumption 1.3 times, and employing stirring speed is after 57r/min stir process 1.7h, and filtration treatment is carried out to it, obtain filtrate a and filter residue a, filtrate a returns step 1) carry out circular treatment, filter residue a is stand-by;
(4) be separated: filter residue a is placed in and resolves groove, and add the thiourea solution of 1.6 times of filter residue a weight wherein, and employing stirring speed is after 69r/min stir process 43min, add reductive agent more wherein and carry out reduction treatment, and when reduction treatment, the temperature that adjustment is resolved in groove is 83 DEG C, be after 87r/min stir process 29min with stirring velocity, filter, obtaining filtrate b and filter residue b, filter residue b is bronze; Filtrate b returns step 1) carry out circular treatment, can complete and extract gold from pyrrhotite.
The concentration of described salpeter solution is 2.9mol/l.
Described Sodium Nitrite is 390 object powder.
Described Losantin is 330 object powder.
Described basic anionic resin solution is-N (CH
3)
3oH.
Described-N (CH
3)
3the volumetric molar concentration of OH is 2.3mol/l.
The volumetric molar concentration of described thiourea solution is 1.7mol/l.
Claims (7)
1. from pyrrhotite, extract a method for gold, it is characterized in that, comprise the following steps:
(1) pre-treatment: pyrrhotite is placed in pulverizer and is crushed to 300-400 order, obtain pyrrhotite powder, and be placed in pretreatment pool, add the salpeter solution of pyrrhotite powder 1-3 times of weight more wherein, and adopt the stirring velocity of agitator to be 40-70r/min stir process 1-2h, add the Sodium Nitrite of salpeter solution 0.7-0.9 times weight more wherein, and after continuing stir process 20-30min, being placed on temperature is leave standstill process 10-20min in 60-70 DEG C, add hydrogen peroxide wherein again, wherein the consumption of hydrogen peroxide is 1-1.3 times of nitrous acid weight, and to control solution temperature be after 50-60 DEG C, again using mercurous chloride electrode as reference electrode, potential in measuring point solution, and the potential in solution is adjusted and controls at≤450mV, after making its sustained reaction 3-4h, obtain pre-treatment slip, stand-by,
(2) Leaching of Gold: by step 1) slip that obtains of pre-treatment adds water process of sizing mixing, wherein the amount ratio of slip and water is (2-4): (0.5-1.5), add the hydrochloric acid that volumetric molar concentration is 2mol/l more wherein, hydrochloric acid consumption is 1-2 times of slip weight, and be after 30-60r/min stir process 20-30min with stirring velocity, add the Losantin of the 4-6% of slip weight more wherein, and to adjust stirring velocity be after 80-120r/min stir process 1-3h, the temperature adjusting solution is again 70-90 DEG C, after leaving standstill process 0.5-1.5h, filter, obtain filtrate and filter residue,
(3) enrichment: by step 2) filtrate that obtains is placed in reaction tank, and in reaction tank, add hydrochloric acid consumption 1-2 basic anionic resin solution doubly, and employing stirring speed is after 50-60r/min stir process 1-3h, and filtration treatment is carried out to it, obtain filtrate a and filter residue a, filtrate a returns step 1) carry out circular treatment, filter residue a is stand-by;
(4) be separated: filter residue a is placed in and resolves groove, and add the 1-3 thiourea solution doubly of filter residue a weight wherein, and employing stirring speed is after 60-80r/min stir process 30-60min, add reductive agent more wherein and carry out reduction treatment, and when reduction treatment, the temperature that adjustment is resolved in groove is 80-90 DEG C, be after 80-90r/min stir process 20-30min with stirring velocity, filter, obtaining filtrate b and filter residue b, filter residue b is bronze; Filtrate b returns step 1) carry out circular treatment, can complete and extract gold from pyrrhotite.
2. from pyrrhotite, extract the method for gold as claimed in claim 1, it is characterized in that, the concentration of described salpeter solution is 2-3mol/l.
3. from pyrrhotite, extract the method for gold as claimed in claim 1, it is characterized in that, described Sodium Nitrite is 300-400 object powder.
4. from pyrrhotite, extract the method for gold as claimed in claim 1, it is characterized in that, described Losantin is 300-400 object powder.
5. from pyrrhotite, extract the method for gold as claimed in claim 1, it is characterized in that, described basic anionic resin solution is-N (CH
3)
3oH.
6. from pyrrhotite, extract the method for gold as claimed in claim 5, it is characterized in that, described-N (CH
3)
3the volumetric molar concentration of OH is 1-3mol/l.
7. from pyrrhotite, extract the method for gold as claimed in claim 1, it is characterized in that, the volumetric molar concentration of described thiourea solution is 1-2mol/l.
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Cited By (6)
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| CN106044841A (en) * | 2016-08-17 | 2016-10-26 | 太仓沪试试剂有限公司 | Preparation method of chloroauric acid |
| CN106167853A (en) * | 2016-08-24 | 2016-11-30 | 铜仁市万山区盛和矿业有限责任公司 | A kind of ultrasonic extraction process of gold |
| CN106222436A (en) * | 2016-08-24 | 2016-12-14 | 铜仁市万山区盛和矿业有限责任公司 | A kind of microwave extract method of magnetic iron ore |
| CN106319239A (en) * | 2016-08-24 | 2017-01-11 | 铜仁市万山区盛和矿业有限责任公司 | Method for extracting arsenopyrite |
| CN106350670A (en) * | 2016-08-24 | 2017-01-25 | 铜仁市万山区盛和矿业有限责任公司 | Treatment process of pyrrhotite |
| CN110945150A (en) * | 2017-08-08 | 2020-03-31 | 钴蓝集团有限公司 | Recovery of metals from pyrite |
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| CN106044841A (en) * | 2016-08-17 | 2016-10-26 | 太仓沪试试剂有限公司 | Preparation method of chloroauric acid |
| CN106167853A (en) * | 2016-08-24 | 2016-11-30 | 铜仁市万山区盛和矿业有限责任公司 | A kind of ultrasonic extraction process of gold |
| CN106222436A (en) * | 2016-08-24 | 2016-12-14 | 铜仁市万山区盛和矿业有限责任公司 | A kind of microwave extract method of magnetic iron ore |
| CN106319239A (en) * | 2016-08-24 | 2017-01-11 | 铜仁市万山区盛和矿业有限责任公司 | Method for extracting arsenopyrite |
| CN106350670A (en) * | 2016-08-24 | 2017-01-25 | 铜仁市万山区盛和矿业有限责任公司 | Treatment process of pyrrhotite |
| CN106319239B (en) * | 2016-08-24 | 2018-06-29 | 铜仁市万山区盛和矿业有限责任公司 | A kind of extracting method of arsenical pyrite |
| CN110945150A (en) * | 2017-08-08 | 2020-03-31 | 钴蓝集团有限公司 | Recovery of metals from pyrite |
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