CN104561580B - A kind of method of Leaching of Silver oxidized form manganese-silver ore selecting smelting from difficulty - Google Patents
A kind of method of Leaching of Silver oxidized form manganese-silver ore selecting smelting from difficulty Download PDFInfo
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Abstract
The present invention relates to mineral processing technique field, specifically, relate to a kind of method of Leaching of Silver oxidized form manganese-silver ore selecting smelting from difficulty.Comprise the following steps: 1, manganese-silver ore stone is broken, corase grind, make manganese-silver ore powder；2, manganese-silver ore powder is mixed homogeneously according to the ratio that mass ratio is 1:2 4 with reducing agent, prepare sample ore standby；3, wet separation: the sample ore that step 2 prepares is reacted according to the ratio that solid-to-liquid ratio is 1g:3ml ~ 5ml with sulphuric acid, is stirred continuously meanwhile, after making solid-liquid be fully contacted, carrying out water-bath and with stirring once in a while, bath temperature is 80 90 DEG C, response time is 2 hours, prepares slurry standby；4, solid-liquid separation: be centrifuged separating by the slurry that step 3 prepares, and wash 12 times；Mother solution after centrifugal is separated with fine filter paper filtering, obtains residue；5, silver extraction by cyanidation: leach silver from residue with sodium cyanide solution.The present invention, while Reduced separating manganese, can improve the cyanide leaching of silver greatly.
Description
Technical field
The present invention relates to mineral processing technique field, specifically, relate to a kind of method of Leaching of Silver oxidized form manganese-silver ore selecting smelting from difficulty.
Background technology
The manganese ore of argentiferous is commonly referred to manganese-silver ore, tens of to thousands of grams of raw ore argentiferous per ton, is the important Silver mineral deposit type of China.Other metalliferous minerals such as a small amount of lead of the type manganese-silver ore simultaneously association, zinc, ferrum, wherein, are pyrolusite containing manganese essential mineral, in addition with a small amount of manganite, psilomelane, Ferromanganese Ore and braunite etc..In the type ore deposit, the occurrence form of silver mainly has: 1. in isomorph formal distribution in manganese ore lattice；2. it is distributed in manganese ore or the inclusion of aggregation or microfissure in microfine inclusion enclave；3. presented in the independent silver deposit things such as horn silver, native silver or the argentite of microfine.These occurrence forms of silver and allocation proportion have different in the manganese oxide type silver ore of different sources, but how to be distributed as main with isomorph or subparticle inclusion.
Actually, Mn in oxidized form manganese-silver ore is+4 valency manganese, the key problem in technology extracting silver is to destroy the crystal structure of argentiferous manganese mineral and make silver be exposed, and therefore, uses certain way that the crystal structure of manganese mineral is destroyed and will be played an important role the leaching of follow-up silver before extracting silver.
The feature of roasting method process for extracting silver is the crystal structure by roasting action breaks down manganese mineral He other silver containing mineral, silver is made to be converted into the silver chloride being prone to leach, the advantage of this technique is that production technology and equipment are simpler, to mine strong adaptability, but after its shortcoming is roasting, flue gas needs process discharge.
Wet process for extracting silver mainly includes reduction and two key steps of cyaniding of silver of+4 valency manganese.Cyaniding silver leaching process is the most ripe, and its technical process is simple, and leaching effect is good.Therefore, choose effective reducing agent, on the premise of the loss controlling silver, preferably manganese silver is separated, make silver be exposed, and then the cyanide leaching improving silver is to reclaim the important step of silver resource in manganese-silver ore.
Chinese patent ZL93103953.3 have employed sulfur dioxide and reaches 94.45% as reducing agent, separation leaching of manganese, the response rate of last Cyanide Leaching silver.ZL201010174267.4 is with the crude fibre reduction leaching manganese in plant by-product straw etc., and the response rate of follow-up cyaniding leaching silver is higher, technological principle source light low cost.
While above-mentioned patented method exists advantage, there is also certain deficiency, large range of application could not be realized.Therefore, studying feasible method of reducing further, in exploitation manganese-silver ore, manganese silver separates and recovery process, and the efficient utilization to realizing China's manganese-silver ore resource still has great importance.
Summary of the invention
It is an object of the invention to, it is provided that a kind of method of Leaching of Silver oxidized form manganese-silver ore selecting smelting from difficulty, while Reduced separating manganese, the cyanide leaching of silver can be improved greatly.
For achieving the above object, the technical solution adopted in the present invention is:
A kind of method of Leaching of Silver oxidized form manganese-silver ore selecting smelting from difficulty, it is characterised in that: comprise the following steps:
1, preparation of samples: manganese-silver ore stone is broken, corase grind, makes manganese-silver ore powder, standby；
2, sample mix: mixed homogeneously according to the ratio that mass ratio is 1:2-4 with reducing agent by manganese-silver ore powder, prepares sample ore standby；
3, wet separation: the sample ore that step 2 prepares is reacted according to the ratio that solid-to-liquid ratio is 1g:3ml ~ 5ml with sulphuric acid, simultaneously, it is stirred continuously, after making solid-liquid be fully contacted, carry out water-bath and with stirring once in a while, bath temperature is 80-90 DEG C, and the response time is 2 hours, prepares slurry standby；
4, solid-liquid separation: be centrifuged separating by the slurry that step 3 prepares, and wash 1-2 time；Mother solution after centrifugal is separated with fine filter paper filtering, obtains residue；
5, silver extraction by cyanidation: leach silver from the residue that step 4 obtains with sodium cyanide solution；Sodium cyanide solution pH controls at 11-12.5, and liquid-solid ratio is 5:1, and the time is 24 hours.
Saying further, the reducing agent used in described step 2 is ferrous sulfate.
Beneficial effect:Compared with prior art, the present invention is a kind of method technique selecting the oxidized form manganese-silver ore of smelting to extract silver for difficulty, while Reduced separating manganese, can improve the cyanide leaching of silver greatly.The results showed, the direct cyanide leaching of this oxidized form manganese-silver ore is about 8-10%, belongs to typical difficulty and selects smelting manganese-silver ore, it is difficult to form economic benefit；And the present invention uses cyaniding after first reduction, the loss rate of reduction process silver, less than 1%, totally can be promoted to more than 93% by the highest for the cyanide leaching of silver.
Detailed description of the invention
Below in conjunction with specific embodiment, the invention will be further described.
Embodiment
1
:
Select the method for Leaching of Silver the oxidized form manganese-silver ore of smelting described in the present embodiment from difficulty, comprise the following steps:
1, preparation of samples: manganese-silver ore stone is broken, corase grind, makes manganese-silver ore powder, standby；
2, sample mix: weigh manganese-silver ore powder 200g, mixs homogeneously manganese-silver ore powder according to the ratio that mass ratio is 1:2-4 with ferrous sulfate, prepares sample ore standby；
3, wet separation: sample ore step 2 prepared and sulphuric acid are the ratio of 1g:3ml ~ 5ml according to solid-to-liquid ratio, the sulphuric acid 1000mL adding 2.5mol/L reacts, simultaneously, it is stirred continuously, after making solid-liquid be fully contacted, carrying out water-bath and with stirring once in a while, bath temperature is 80-90 DEG C, response time is 2 hours, prepares slurry standby；
4, solid-liquid separation: be centrifuged separating by the slurry that step 3 prepares, and wash 1-2 time；Mother solution after centrifugal is separated with fine filter paper filtering, obtains residue；
5, silver extraction by cyanidation: leach silver from the residue that step 4 obtains with sodium cyanide solution；Sodium cyanide solution pH controls at 11-12.5, and liquid-solid ratio is 5:1, and the time is 24 hours.
Being computed, the cyaniding rate of silver reaches more than 77%.
Embodiment
2
:
Select the method for Leaching of Silver the oxidized form manganese-silver ore of smelting described in the present embodiment from difficulty, comprise the following steps:
1, preparation of samples: manganese-silver ore stone is broken, corase grind, makes manganese-silver ore powder, standby；
2, sample mix: weigh manganese-silver ore powder 200g, mixs homogeneously manganese-silver ore powder according to the ratio that mass ratio is 1:2-4 with ferrous sulfate, prepares sample ore standby；
3, wet separation: sample ore step 2 prepared and sulphuric acid are the ratio of 1g:3ml ~ 5ml according to solid-to-liquid ratio, the sulphuric acid 800mL adding 3mol/L reacts, simultaneously, it is stirred continuously, after making solid-liquid be fully contacted, carrying out water-bath and with stirring once in a while, bath temperature is 80-90 DEG C, response time is 2 hours, prepares slurry standby；
4, solid-liquid separation: be centrifuged separating by the slurry that step 3 prepares, and wash 1-2 time；Mother solution after centrifugal is separated with fine filter paper filtering, obtains residue；
5, silver extraction by cyanidation: leach silver from the residue that step 4 obtains with sodium cyanide solution；Sodium cyanide solution pH controls at 11-12.5, and liquid-solid ratio is 5:1, and the time is 24 hours.
Being computed, the cyaniding rate of silver reaches more than 89%.
Embodiment
3
:
Select the method for Leaching of Silver the oxidized form manganese-silver ore of smelting described in the present embodiment from difficulty, comprise the following steps:
1, preparation of samples: manganese-silver ore stone is broken, corase grind, makes manganese-silver ore powder, standby；
2, sample mix: weigh manganese-silver ore powder 200g, mixs homogeneously manganese-silver ore powder according to the ratio that mass ratio is 1:2-4 with ferrous sulfate, prepares sample ore standby；
3, wet separation: sample ore step 2 prepared and sulphuric acid are the ratio of 1g:3ml ~ 5ml according to solid-to-liquid ratio, the sulphuric acid 600mL adding 4mol/L reacts, simultaneously, it is stirred continuously, after making solid-liquid be fully contacted, carrying out water-bath and with stirring once in a while, bath temperature is 80-90 DEG C, response time is 2 hours, prepares slurry standby；
4, solid-liquid separation: be centrifuged separating by the slurry that step 3 prepares, and wash 1-2 time；Mother solution after centrifugal is separated with fine filter paper filtering, obtains residue；
5, silver extraction by cyanidation: leach silver from the residue that step 4 obtains with sodium cyanide solution；Sodium cyanide solution pH controls at 11-12.5, and liquid-solid ratio is 5:1, and the time is 24 hours.
Being computed, the cyaniding rate of silver reaches more than 93%.
Claims (1)
1. the method for Leaching of Silver the oxidized form manganese-silver ore selecting smelting from difficulty, it is characterised in that: comprise the following steps:
(1) preparation of samples: manganese-silver ore stone is broken, corase grind, makes manganese-silver ore powder, standby；
(2) sample mix: mixed homogeneously according to the ratio that mass ratio is 1:2-4 with reducing agent ferrous sulfate by manganese-silver ore powder, prepares sample ore standby；
(3) wet separation: the sample ore that step (2) prepares is reacted according to the ratio that solid-to-liquid ratio is 1g:3ml ~ 5ml with sulphuric acid, simultaneously, it is stirred continuously, after making solid-liquid be fully contacted, carry out water-bath and with stirring once in a while, bath temperature is 80-90 DEG C, and the response time is 2 hours, prepares slurry standby；
(4) solid-liquid separation: be centrifuged separating by the slurry that step (3) prepares, and wash 1-2 time；Mother solution after centrifugal is separated with fine filter paper filtering, obtains residue；
(5) silver extraction by cyanidation: leach silver from the residue that step (4) obtains with sodium cyanide solution；Sodium cyanide solution pH controls at 11-12.5, and liquid-solid ratio is 5:1, and the time is 24 hours.
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| CN105779784B (en) * | 2016-03-18 | 2017-02-08 | 广州有色金属研究院 | Method for leaching gold and silver out of kustelite wrapped by manganese under normal pressure and temperature |
| CN106521178B (en) * | 2016-11-21 | 2019-01-04 | 昆明理工大学 | A kind of electrum pretreatment ore-dressing technique containing ferrimanganic |
| CN111286603B (en) * | 2020-03-25 | 2021-05-25 | 内蒙古金山矿业有限公司 | Process for recovering silver and co-producing manganese sulfate from manganese-containing silver ore |
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| CN102703726A (en) * | 2012-06-20 | 2012-10-03 | 丰宁满族自治县旷达锰银矿业有限公司 | Method for extracting manganese and silverfrom oxidized manganese- silverores |
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