CN102534195B - Gold extraction process method for refractory gold ore - Google Patents
Gold extraction process method for refractory gold ore Download PDFInfo
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- CN102534195B CN102534195B CN201010581979.8A CN201010581979A CN102534195B CN 102534195 B CN102534195 B CN 102534195B CN 201010581979 A CN201010581979 A CN 201010581979A CN 102534195 B CN102534195 B CN 102534195B
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Abstract
A gold extraction process method for refractory gold ore uses continuous operations of sulfation roasting, cinder secondary low-temperature acidic roasting, middle-temperature sulfation decomposition and cyaniding gold extraction. Sulfuric acid produced in a general sulfation roasting process is utilized, cinder is secondarily roasted and oxidized in low temperature and acidic mode, then middle temperature roasting is performed to resolve sulfate, the cinder is finely ground to be cyanided and leached, and refractory gold wrapped in carbon, arsenic and sulphur can be efficiently recycled. The method combines advantages of a roasting oxidation method and an acid hot press oxidation method and enables the advantages to be achieved in normal pressure, thereby being moderate in operation conditions, quick in response speed, low in process investment cost, appropriate in production cost, environmentally-friendly and capable of achieving industrial production easily. The method is also suitable for other roasting-leaching hydrometallurgy systems.
Description
Technical field
The present invention relates to the extraction process of gold mine, provide especially a kind of Refractory Au-ores to put forward golden processing method.
Background technology
The reserves of refractory gold ore account for 60% of world's gold mine total reserves, and along with easily soaking in the world the day by day exhausted of gold ore resource, the extraction of gold progressively turns to Refractory Au-ores.This class gold mine is mainly that the particularly existence of organic charcoal, does not also have a kind of effective method so far in order to improve the rate of recovery of this class gold mine gold because the existence of the harmful elements such as charcoal sulphur arsenic affects golden leaching.
Tradition roasting oxidation method is the difficult-treating gold mine pretreatment process of comparative maturity, its parcel gold in pyrite, mispickel sulfides that can dissociate, and can comprehensively reclaim sulphur and arsenic wherein.But it is wayward that its shortcoming is roasting process, not that " underburnt " is exactly " burning ", be difficult to guarantee that output is suitable for the high-quality calcining of cyanide gold-leaching.Particularly, for the high material of carbon containing, in calcining process, be difficult to burn completely whole carbon, may make the remaining carbon ratio in calcining before roasting, not have more activity, inhale gold (rob gold) ability stronger, make the gold leaching rate after roasting may be lower.For containing the high gold-bearing material of arsenic, if do not add reductive agent (as coal) in roasting, the loss that gold volatilizees with arsenic is very large; If add appropriate reductive agent, again by Cyanide Leaching follow-up impact.So traditional roasting oxidation method is processed difficult-treating gold mine very large shortcoming.
Hot-pressure oxidation technique is also one of difficult-treating gold mine pretreatment process, and it is divided into two kinds of acid hot-pressure oxidation method and alkaline hot-pressure oxidation methods.Alkalescence hot-pressure oxidation method is owing to being only applicable to the refractory gold ore that carbonate content is high, sulfide content is low, thereby comparatively speaking, the application of acid hot-pressure oxidation technique is comparatively extensive.The advantage of acid hot-pressure oxidation method is that the oxidation products of sulfurous iron ore and mispickel is all soluble, therefore, how gold grain carefully all can be dissociated, thereby the leaching rate of recovery of gold is higher, many golden ore concentrate hard to treat after Pretreatment with Pressurized, gold leaching yield have up to more than 98%.This technique can directly be processed raw ore simultaneously, and this is more effective for being not easy to the Gold Ore of floating and enriching.But the shortcoming of this technique is: the design of equipment and material require very high, and because the Anticorrosion of High Temperature High Pressure operation and equipment can bring very high danger, compared with biological oxidation process, the requirement of operation and maintenance level is higher; Moreover initial cost is large, thereby generally believe to only have construction large-scale plant, just more reasonable economically.
In addition, acid hot-pressure oxidation method is the same with bio-oxidation technique, and major ingredient ferro element and arsenic etc. in material are substantially all soluble in water, has increased many pressure to the processing of factory effluent, has also increased processing costs.The diversity such as technique is also selective to material, " poor, thin, assorted " concerning current difficult-treating gold mine resource, application is also subject to certain limitation, to the processing of carbonaceous gold ore, and weak effect.
Bio-oxidation technique is also one of difficult-treating gold mine pretreatment process, is that another has the pretreatment technology of powerful vitality after roasting oxidation technique and hot-pressure oxidation technique.But also there are many weakness, as: oxidization time is long, and pulp density is low, needs the stirring oxidation trough of large volume; Oxidation needs high oxygen-supplying amount, and blower fan energy expenditure is high; Oxidation heat liberation, while normally work, generally needs cooling down, consumes extra energy; If occurred in operation once " mishandle ", bacterium may be dead, and this needs the biomass of bacterium to be recovered in several weeks; Material is also had to the selectivity of height, application is also very limited, to the processing of carbonaceous gold ore, weak effect.
summary of the invention
The object of the present invention is to provide a kind of Refractory Au-ores to put forward golden processing method, to solve, the complicated operation, the cost that in gold extracting method in the past, exist are high, pollution is large, put forward the problems such as golden rate is low.
A kind of Refractory Au-ores provided by the invention is put forward golden processing method for the treatment of containing charcoal, sulfur-bearing, treating refractory As-containing gold ore, utilize the sulfuric acid of output in conventional sulfurization roasting technique, the slag of conventional sulfurization roasting is carried out to the acid roasting oxidation of secondary low temperature, after the acid roasting of secondary low temperature, carry out medium temperature roast and decompose vitriol recovery sulphur trioxide and sulfurous gas, carry out afterwards Cyanide Leaching, make gold in difficult-treating gold mine by high efficiency extraction, concrete technological process as shown in Figure 1:
Step 1: the Refractory Au-ores raw ore of sulfur-bearing >10% or gold ore are carried out to conventional sulfation oxidizing roasting, obtain sulfation calcining, simultaneously from sulfurization roasting flue dust by white arsenic and sulfur dioxide recovery;
Step 2: above-mentioned sulfation calcining is wetting with sulfuric acid, and wherein, the mass ratio of sulfuric acid and water is 1:0.5 ~ 0.7, and the mass ratio of calcining and water is 1:0.3 ~ 0.45; Wherein said sulfuric acid is preferably made up of the sulfurous gas that obtaining in step 1, thereby realizes the self-sufficient of technique acid, and the tail gas discharging in the process of conventional sulfuric acid oxidation roasting, carries out off gas treatment, qualified discharge by vitriol works's technological standards simultaneously;
Step 3: the sulfation calcining after wetting is sent into dissepiment roaster and dry, carry out the acid roasting oxidation of secondary low temperature, wherein, dissepiment roaster is from burner to stove tail, temperature is low rear height first, and variation range is 150 ~ 300 DEG C, generally dries 90 ~ 120min, concrete how much consuming time, should determine according to the character of different material;
In low-temperature bake process, material dehydration, dilute sulphuric acid changes the vitriol oil into, is approaching (338 DEG C of vitriol oil boiling points) under vitriol oil boiling temperature, and the vitriol oil has extremely strong oxidisability, can be oxidized most metal suboxides, sulfide, organism etc., even wood chip also can be oxidized to carbon, be then oxidized to carbonic acid gas, therefore, the Multimetal oxides such as iron in material, copper, lead, zinc, nickel, cobalt, antimony, all can be oxidized to vitriol approaching by sulfuric acid under its boiling temperature; Secondly, in sulfation calcining, original residual active carbon, arsenic and sulfide etc. of having more, are also oxidized to CO
2, As
2o
3and vitriol, thereby further in dissociation sulfurization roasting process not by dissociation and because of the new parcel gold producing of burning, wherein the thermal source of dissepiment roaster derives from the waste heat of vitriol works;
Step 4: the product after above-mentioned secondary low-temperature bake is put into dryer and continue baking, decompose vitriol, and volatilize unnecessary acid, wherein, storing temperature is 550 DEG C ~ 600 DEG C;
After the acid roasting of secondary low temperature, then in the inherent dryer of 550 DEG C ~ 600 DEG C temperature ranges higher than iron sulfate and other metal sulfate dissociation, continue roasting and carry out sulfation decomposition, conventionally the time is 60min, because the temperature of most metals vitriol dissociation is 550 DEG C ~ 600 DEG C, therefore can not produce new inclusion in this temperature range, thereby, make the vitriol of iron dissociate into Fe
2o
3, also dissociation discharge SO of other metal sulfate
3.The acid that roasting volatilizes is (containing SO
3, SO
2) and the SO that decomposites
3(containing SO
2) return to vitriol works's relieving haperacidity, recycle, reduces and pollutes, and has also reduced cost simultaneously;
Step 5: the product after drying is added water and sized mixing, after sizing mixing, in immersing-by-grinding machine, be finely ground to more than 90% ~ 95% by 400 orders, and then add calcium oxide and sodium cyanide is sized mixing, after regulating pH value to be 10 ~ 11, carry out golden cyaniding processing, finally carry gold complete, wherein, described cyaniding processing can conventional cyanidation 24h or is carried out pressure cyanide 2h(reactor 0.8MPa), the leaching yield of gold generally all can reach more than 90% ~ 95%;
After roasting finishes, add water and size mixing, its objective is in the time that association valuable element has recovery value in infusion, can from infusion, reclaim, as copper etc.;
Water logging slag is finely ground to 400 orders through tower grinding-leaching mill and accounts for more than 90% ~ 95%, and this process further dissociation is wrapped in the gold in gangue.
In sum, a kind of Refractory Au-ores provided by the invention is put forward golden processing method, adopts sulfurization roasting to process Refractory Au-ores in conjunction with the method for secondary low-temperature bake and sulfation decomposition.The employing of the acid roasting of secondary low temperature, make the technology control of sulfurization roasting unit less demanding, no matter sulfurization roasting unit is " underburnt " or " burning ", also the decreasing ratio of not being afraid of sulfurization roasting unit arsenic, sulphur, carbon is high and not high, and also no matter ferro element is mainly with Fe in sulfurization roasting unit
2o
3form exists still with Fe
3o
4form exist, all little on golden cyanide leaching impact, further processing and sulfation through the acid calcining process of follow-up secondary low temperature are decomposed, can obtain the high Cyanide Leaching rate of recovery, its overall process is for adopting sulfurization roasting, and---cyanidation gold-extracted works continuously in the acid roasting of slag secondary low temperature---middle temperature sulfation is decomposed---, makes to be wrapped in indissoluble gold in carbon, arsenic, sulphur by high efficiente callback.
Refractory Au-ores provided by the invention is put forward golden processing method in order to improve the protection to environment, can also do following improvement:
1, the off gas treatment after sulfurization roasting relieving haperacidity, on the basis of existing conventional vitriol works tail gas treatment device, increases the same treatment facility of one ~ secondary, waste gas qualified discharge more.
2, the arsenic-containing material in arsenic condensing chamber and gas cleaning unit is received in sulfurization roasting, can adopt the negatively pressurized static external heat equipment of standard universal to be heated to 150 DEG C, arsenic is distilled and be purified to more than 99.6% pure As
2o
3product, the residual slag after then arsenic being reclaimed, passes on the golden system of selecting.
3, the mine tailing after cyanidation gold-extracted, through SO
2the processing of-air oxidation process, eliminates after prussiate, can be through dehydrating processing, and export trade is to cement mill, or manages brick field brickmaking export trade by oneself.
4, material, before entering Cyanide Leaching, is removed most base metals by water-immersion system.In leaching vat or reactor, carry out Cyanide Leaching, prussiate consumption is low, and leach liquor can recycle for a long time.
5, the acid waste water producing in technological process can be used as the acid roasting batching of secondary low temperature water, saves sulfuric acid consumption, does not also need outer row.
6, other water coolant, punching ground water etc. also can be realized factory's internal recycle use.
In sum, Refractory Au-ores provided by the invention is put forward golden processing method can reach the object of producing without useless, environmentally friendly.
Refractory Au-ores provided by the invention is put forward golden processing method compared with pressure oxidation method, bacterial oxidation method, there is technical process simple, less investment, working cost is low, easy to operate feature, particularly secondary low-temperature bake, it takes full advantage of the sulfuric acid of producing in leading portion sulfurization roasting process and carries out secondary exhaustive oxidation, fully make gold dissociate, the harmful elements such as the golden charcoal leaching, sulphur, arsenic of eliminating the effects of the act more up hill and dale, and then carrying out middle temperature sulfation decomposes, decompose vitriol and volatilize unnecessary acid, then pass through fine grinding, realize golden high efficiency extraction, in addition, the present invention is also unified in the advantageous properties of roasting oxidation method and acid hot-pressure oxidation method under normal pressure and realizes, the compatible advantage of two kinds of methods, operational condition is gentleer, speed of response is fast, technology investment expense is low, productive expense is suitable, environmental friendliness, be easy to realize suitability for industrialized production, the method is also suitable for the pre-treatment of other sulfur-bearing containing type difficult-treating gold mines such as arsenic, and be suitable for other roasting, the hydrometallurgy system leaching.
Brief description of the drawings
Fig. 1 is the gold extraction technology schema of Refractory Au-ores.
Embodiment
Embodiment 1:
Yunnan Zhenyuan's gold floatation concentrate, contains golden 35.86g/t, sulfur-bearing 15.11%, contains arsenic 0.70%, carbon containing 4.83%, and fineness is 70%-37um.The granularity of gold is fine, is mainly sulfide parcel, accounts for 85.69%, and the exposed gold of monomer accounts for 10.16%, and packed in gangue gold accounts for 4.15%, and under mating plate mirror, the maximum goldc grains of finding is 0.0085mm, wherein many at 0.002 ~ 0.005mm.In sample ore, organic carbon content, up to 1.11%, has very strong " robbing gold " ability.Directly cyaniding 48h, the leaching yield of gold is only 1%.
Get gold ore (drying) 1000g, in the time of 400 DEG C of muffle furnace furnace temperature, enter stove, after 30min, start to be warming up to 650 DEG C, crack fire door (stir and turn over breeze three times), temperature control roasting 60min midway.Being cooled to weight after normal temperature is 867g, and slag productive rate is 86.7%.
Claim slag 433.5g, use 250gH
2sO
4(about 136ml) and water 150ml size mixing, and carry out afterwards low-temperature bake.In the time of 150 DEG C of muffle furnace furnace temperature, enter the roasting 30min of bake oven, when slip is baked, block rear shovel is moving is divided into fritter, then is warming up to 200 DEG C and 250 DEG C and respectively toasts 30min.
After low-temperature bake, then be warming up to 550 DEG C～600 DEG C, continue baking 60min.Then be cooled to room temperature, the heavy 422g of slag, by raw material slag productive rate 84.4%.Add water afterwards, under 50% ore milling concentration, in tower grinding-leaching mill, be finely ground to 400 orders and cross 95%.Then add CaO and sodium cyanide is sized mixing, slurry pH 10.5 left and right, cyanogen root concentration 1 ‰, air agitation leaches 48h, supplements a small amount of (0.5kg/t) H midway
2o
2.Cyanidation tailings gold grade 2.39g/t, the leaching rate of recovery 94.37% of gold.
Embodiment 2:
Chang'an, Yunnan gold floatation concentrate, containing golden 37.60g/t, containing arsenic 3.47%, sulfur-bearing 22.82%.The disseminated grain size of gold is atomic thin, is substantially all less than 10um, occupies the majority with 2～10um.Gold is irregular granular filling in mispickel intergranular gap or mispickel edge, or is distributed in pyrite crack with pyrite adhesion embedding, or is fine granular inclusion and is contained in quartz.Directly cyaniding 48h, the leaching yield of gold only 13.7%.
Get gold ore (drying) 1000g, in the time of 400 DEG C of muffle furnace furnace temperature, enter stove, after 30min, start to be warming up to 650 DEG C, crack fire door (stir and turn over breeze three times), temperature control roasting 60min midway.Being cooled to weight after normal temperature is 920g, and slag productive rate is 92.0%.
Claim slag 460g, use 250gH
2sO
4(about 136ml) and water 150ml size mixing, and carry out afterwards low-temperature bake.In the time of 150 DEG C of muffle furnace furnace temperature, enter the roasting 30min of bake oven, when slip is baked, block rear shovel is moving is divided into fritter, then is warming up to 200 DEG C and 250 DEG C and respectively toasts 30min.
After low-temperature bake, then be warming up to 550 DEG C～600 DEG C, continue baking 60min.Then be cooled to room temperature, the heavy 449g of slag, by raw material slag productive rate 89.8%.Add water afterwards, under 50% ore milling concentration, in tower grinding-leaching mill, be finely ground to 400 orders and cross 95%.Then add CaO and sodium cyanide is sized mixing, slurry pH 10.5 left and right, cyanogen root concentration 1 ‰, air agitation leaches 48h, supplements a small amount of (0.5kg/t) H midway
2o
2.Cyanidation tailings gold grade 2.38g/t, the leaching rate of recovery 94.32% of gold.
Embodiment 3:
Guangxi golden tooth gold floatation concentrate, contains golden 53.60g/t, sulfur-bearing 32.28%, contains arsenic 7.51%, carbon containing 0.86%.Directly cyaniding 48h, the leaching yield of gold is 53.2%.
Get gold ore (drying) 1000g, in the time of 400 DEG C of muffle furnace furnace temperature, enter stove, after 30min, start to be warming up to 650 DEG C, crack fire door (stir and turn over breeze three times), temperature control roasting 60min midway.Being cooled to weight after normal temperature is 858g, and slag productive rate is 85.8%.
Claim slag 429g, use 250gH
2sO
4(about 136ml) and water 150ml size mixing, and carry out afterwards low-temperature bake.In the time of 150 DEG C of muffle furnace furnace temperature, enter the roasting 30min of bake oven, when slip is baked, block rear shovel is moving is divided into fritter, then is warming up to 200 DEG C and 250 DEG C and respectively toasts 30min.
After low-temperature bake, then be warming up to 550 DEG C～600 DEG C, continue baking 60min.Then be cooled to room temperature, the heavy 413g of slag, by raw material slag productive rate 82.6%.Add water afterwards, under 50% ore milling concentration, in tower grinding-leaching mill, be finely ground to 400 orders and cross 95%.Then add CaO and sodium cyanide is sized mixing, slurry pH 10.5 left and right, cyanogen root concentration 1 ‰, air agitation leaches 48h, supplements a small amount of (0.5kg/t) H midway
2o
2.Cyanidation tailings gold grade 1.78g/t, the leaching rate of recovery 97.26% of gold.
Embodiment 4:
Lijiang, yunnan Ning Lang county ancient times high arsenic matte slag, containing golden 36.58g/t, argentiferous 230g/t, sulfur-bearing 16.15%, containing arsenic 31.33%, cupric 6.43%, leaded 2.18%, containing zinc 3.59%, iron content 36.56%.
Get siccative 1000g, be finely ground to 90% by 200 orders.In the time of 400 DEG C of muffle furnace furnace temperature, enter stove, after 30min, start to be warming up to 650 DEG C, crack fire door (stir and turn over breeze three times), temperature control roasting 60min midway.Being cooled to weight after normal temperature is 723g, and slag productive rate is 72.3%.
Claim slag 361.5g, use 250gH
2sO
4(about 136ml) and water 150ml size mixing, and carry out afterwards low-temperature bake.In the time of 150 DEG C of muffle furnace furnace temperature, enter the roasting 30min of bake oven, when slip is baked, block rear shovel is moving is divided into fritter, then is warming up to 200 DEG C and 250 DEG C and respectively toasts 30min.
After low-temperature bake, then be warming up to 550 DEG C～600 DEG C, continue baking 60min.Then be cooled to room temperature, the heavy 352g of slag, by raw material slag productive rate 70.4%.The leaching copper that adds water afterwards, water logging pulp water wash after under 50% ore milling concentration, in tower grinding-leaching mill, be finely ground to 400 orders and cross 95%.Then add CaO and sodium cyanide is sized mixing, slurry pH 10.5 left and right, cyanogen root concentration 1 ‰, air agitation leaches 48h, supplements a small amount of (0.5kg/t) H midway
2o
2.Cyanidation tailings gold grade 1.18g/t, the leaching rate of recovery 97.73% of gold.
Embodiment 5:
Guizhou carbonaceous gold floatation concentrate: contain golden 46.65g/t, sulfur-bearing 24.30%, carbon containing 2.25%, contain arsenic 2.30%, directly cyaniding 48 hours, the leaching yield of gold is only 14.7%.
Get gold ore (drying) 1000g, in the time of 400 DEG C of muffle furnace furnace temperature, enter stove, after 30min, start to be warming up to 650 DEG C, crack fire door (stir and turn over breeze three times), temperature control roasting 60min midway.Being cooled to weight after normal temperature is 934g, and slag productive rate is 93.4%.
Claim slag 467g, use 250gH
2sO
4(about 136ml) and water 150ml size mixing, and carry out afterwards low-temperature bake.In the time of 150 DEG C of muffle furnace furnace temperature, enter the roasting 30min of bake oven, when slip is baked, block rear shovel is moving is divided into fritter, then is warming up to 200 DEG C and 250 DEG C and respectively toasts 30min.
After low-temperature bake, then be warming up to 550 DEG C～600 DEG C, continue baking 60min.Then be cooled to room temperature, the heavy 452g of slag, by raw material slag productive rate 90.4%.Add water afterwards, under 50% ore milling concentration, in tower grinding-leaching mill, be finely ground to 400 orders and cross 95%.Then add CaO and sodium cyanide is sized mixing, slurry pH 10.5 left and right, cyanogen root concentration 1 ‰, air agitation leaches 48h, supplements a small amount of (0.5kg/t) H midway
2o
2.Cyanidation tailings gold grade 1.97g/t, the leaching rate of recovery 96.18% of gold.
Comparative example 1:
Yunnan Zhenyuan's gold floatation concentrate, contains golden 35.86g/t, sulfur-bearing 15.11%, contains arsenic 0.70%, carbon containing 4.83%, and fineness is 70%-37um.The granularity of gold is fine, is mainly sulfide parcel, accounts for 85.69%, and the exposed gold of monomer accounts for 10.16%, and packed in gangue gold accounts for 4.15%, and under mating plate mirror, the maximum goldc grains of finding is 0.0085mm, wherein many at 0.002 ~ 0.005mm.In sample ore, organic carbon content, up to 1.11%, has very strong " robbing gold " ability.Directly cyaniding 48h, the leaching yield of gold is only 1%.
Get gold ore (drying) 1000g, in the time of 400 DEG C of muffle furnace furnace temperature, enter stove, after 30min, start to be warming up to 650 DEG C, crack fire door (stir and turn over breeze three times), temperature control roasting 60min midway.Being cooled to weight after normal temperature is 867g, and slag productive rate is 86.7%.Add water afterwards, under 50% ore milling concentration, in tower grinding-leaching mill, be finely ground to 400 orders and cross 95%.Then add CaO and sodium cyanide is sized mixing, slurry pH 10.5 left and right, cyanogen root concentration 1 ‰, air agitation leaches 48h, supplements a small amount of (0.5kg/t) H midway
2o
2, the leaching rate of recovery 36.03% of gold.
Comparative example 2
Chang'an, Yunnan gold floatation concentrate, containing golden 37.60g/t, containing arsenic 3.47%, sulfur-bearing 22.82%.The disseminated grain size of gold is atomic thin, is substantially all less than 10um, occupies the majority with 2～10um.Gold is irregular granular filling in mispickel intergranular gap or mispickel edge, or is distributed in pyrite crack with pyrite adhesion embedding, or is fine granular inclusion and is contained in quartz.Directly cyaniding 48h, the leaching yield of gold only 13.7%.
Get gold ore (drying) 1000g, in the time of 400 DEG C of muffle furnace furnace temperature, enter stove, after 30min, start to be warming up to 650 DEG C, crack fire door (stir and turn over breeze three times), temperature control roasting 60min midway.Being cooled to weight after normal temperature is 920g, and slag productive rate is 92.0%.Add water afterwards, under 50% ore milling concentration, in tower grinding-leaching mill, be finely ground to 400 orders and cross 95%.Then add CaO and sodium cyanide is sized mixing, slurry pH 10.5 left and right, cyanogen root concentration 1 ‰, air agitation leaches 48h, supplements a small amount of (0.5kg/t) H midway
2o
2, the leaching rate of recovery 73.46% of gold.
Comparative example 3
Guangxi golden tooth gold floatation concentrate, contains golden 53.60g/t, sulfur-bearing 32.28%, contains arsenic 7.51%, carbon containing 0.86%.Directly cyaniding 48h, the leaching yield of gold is only 53.2%.
Get gold ore (drying) 1000g, in the time of 400 DEG C of muffle furnace furnace temperature, enter stove, after 30min, start to be warming up to 650 DEG C, crack fire door (stir and turn over breeze three times), temperature control roasting 60min midway.Being cooled to weight after normal temperature is 858g, and slag productive rate is 85.8%.Add water afterwards, under 50% ore milling concentration, in tower grinding-leaching mill, be finely ground to 400 orders and cross 95%.Then add CaO and sodium cyanide is sized mixing, slurry pH 10.5 left and right, cyanogen root concentration 1 ‰, air agitation leaches 48h, supplements a small amount of (0.5kg/t) H midway
2o
2, the leaching rate of recovery 76.31% of gold.
Claims (4)
1. Refractory Au-ores is put forward a golden processing method, it is characterized in that: concrete technological process is as follows,
Step 1: the Refractory Au-ores raw ore of sulfur-bearing >10% or gold ore are carried out to conventional sulfation oxidizing roasting, obtain sulfation calcining, simultaneously from sulfurization roasting flue dust by white arsenic and sulfur dioxide recovery;
Step 2: above-mentioned sulfation calcining is wetting with sulfuric acid, and wherein, the mass ratio of sulfuric acid and water is 1:0.5～0.7, and the mass ratio of calcining and water is 1:0.3～0.45;
Step 3: the sulfation calcining after wetting is sent into dissepiment roaster and dry, carry out the acid roasting oxidation of secondary low temperature, dissepiment roaster is from burner to stove tail, and temperature is low rear height first, and variation range is 150～300 DEG C;
Step 4: the product after above-mentioned secondary low-temperature bake is put into dryer and continue baking, decompose various vitriol, and volatilize unnecessary acid;
Step 5: the product after drying is added water and sized mixing, be finely ground in immersing-by-grinding machine after sizing mixing more than 90% by 400 orders, and then add calcium oxide and sodium cyanide is sized mixing, after regulating pH value to be 10～11, carry out golden cyaniding processing, finally carry golden complete.
2. put forward golden processing method according to Refractory Au-ores described in claim 1, it is characterized in that: the sulfuric acid described in step 2 is to be made up of the sulfurous gas that obtaining in step 1.
3. put forward golden processing method according to Refractory Au-ores described in claim 1, it is characterized in that: the storing temperature in step 4 is 550 DEG C～600 DEG C.
4. put forward golden processing method according to Refractory Au-ores described in claim 1, it is characterized in that: sulfurous gas, the sulphur trioxide flue gas producing in step 4 bake process or the unnecessary acid volatilizing absorb through multi-stage spray, turn back in step 2 as acid roasting batching.
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| CN104946901B (en) * | 2014-03-31 | 2017-03-15 | 尚军刚 | A kind of sulfating roasting slag Strong oxdiative processing method |
| CN103937989B (en) * | 2014-04-08 | 2015-06-10 | 南君芳 | Arsenic-bearing gold concentrate treatment technology |
| CN104831084B (en) * | 2015-03-30 | 2017-03-15 | 唐志宇 | Method for extracting gold in difficult mine tailing is wrapped up from iron oxides |
| CN104911372B (en) * | 2015-07-05 | 2017-05-17 | 贵州大学 | Pre-treatment method for micro-disseminated type refractory primary gold ore |
| CN104988330B (en) * | 2015-07-10 | 2016-09-07 | 尚军刚 | The solidification of a kind of sulfating roasting slag broken curing continuous production method |
| RU2691153C1 (en) * | 2018-10-29 | 2019-06-11 | Общество с ограниченной ответственностью Научно-исследовательский и проектный институт "ТОМС" | Method of processing a sulphide concentrate containing precious metals |
| CN112662886A (en) * | 2020-12-17 | 2021-04-16 | 紫金矿业集团股份有限公司 | Method for improving gold cyaniding leaching rate of double refractory gold ores |
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