CN1324152C - Process for treating high arsenic high carbon gold mine - Google Patents

Abstract

The present invention discloses technology for processing gold ores with high arsenic and high carbon. Firstly, bacterial oxidation technology is adopted; under the condition which is suitable for microorganism growth, bacteria adopt sulphur and iron in minerals as food for procreation, so wrapping minerals of gold in minerals are damaged and dissociated, and the wrapped gold is exposed; then, the strengthening carbon-in-leach cyaniding technology is carried out; additives are added into ore pulp before carbon-in-leach technology is carried out, so organic carbon and inorganic carbon in minerals are damaged, suppressed and covered. The present invention solves the 'gold interception ' problem of carbonaceous substances, improves the adverse effect brought by bacterial oxidation to cyanidation, prolongs the cycle index of activated carbon, and largely enhances the recovery of gold. The present invention can process gold ores containing 8% of arsenic and 10% of carbon, and the leaching rate of gold can achieve more than 90%.

Description

A kind of high arsenic high-carbon gold mine treatment process

Technical field

The present invention relates to a kind of high arsenic high-carbon gold mine treatment process, belong to the mineral processing technology.

Background technology

In the explored gold reserve of China, have 30% to be difficult-treating gold mine, the difficult-treating gold mine prospective reserves reaches more than 1000 ton.Along with a large amount of exploitations in easy processing ore deposit, the development and use of difficult-treating gold mine resource have become a vital task of gold mining.At present, aspect difficult-treating gold mine resource preconditioning technique, successfully developed oxidizing roasting, Gu the solid sulphur roasting of arsenic, pressure oxidation, kinds of processes such as bacterial oxidation and chloride oxidation, but these technologies just are suitable for single arsenic-containing gold ore or carbon containing gold mine, many gold mines that China is domestic, the association gold mine, contain arsenic more, organic carbon, impurity such as antimony, and Gold Content is low, often, problems such as environmental pollution and processing cost height use with above-mentioned these art breading because being difficult to large-scale industrial production, if this class ore is with traditional cyaniding gold-extracting method, cyanide consumption height not only, the production cost height, and the leaching yield of gold is very low, and directly the leaching yield of gold tricyanide generally has only 10-50%.

Summary of the invention

Purpose of the present invention is intended to improve the weak point of prior art, provides a kind of and can make full use of resource, reduces environmental pollution, and gold leaching rate improves greatly, and the low high arsenic high-carbon gold mine treatment process of cost.

Technical scheme of the present invention is:

A kind of high arsenic high-carbon gold mine treatment process, its process is:

(1) bacterial oxidation: the mixed bacterium that adopts thiobacillus ferrooxidant, thiobacillus thiooxidans, ferric oxide spirobacteria and heat-resisting thiobacillus thiooxidant, growth conditions: pulp density is 15-25%, PH=1-2, growth temperature is 37-45 ℃, bacterium is food with the sulphur in the mineral, iron and breeds, and the parcel mineral failure of gold in the mineral is dissociated;

(2) with washing of the ore pulp behind the bacterial oxidation and dehydration;

(3) the concentration 30-40% that sizes mixing adds alkaline medium and is transformed into PH=10.5-11;

(4) adding strong oxidizer and composite carbon inhibitor stir pre-treatment in ore pulp, make organic carbon, inorganic carbon in the mineral obtain destroying and suppressing;

(5) charcoal soaks;

(6) gold is reclaimed in the charcoal desorb.

The present invention has adopted bacterial oxidation and has strengthened charcoal and soak the process integration of cyaniding, make the sulphur in the mineral earlier, iron, oxidations such as arsenic, the gold of parcel exposes, oxidized or the passivation of carbonaceous thing of ADSORPTION OF GOLD, reduced the ability of carbonaceous thing ADSORPTION OF GOLD cyano complex in the ore, add additive in the ore pulp before the charcoal soaking technology then, make the organic carbon in the mineral, inorganic carbon obtains destroying and suppresses and covers, not only solved " robbing gold " problem of carbonaceous thing, and improved the detrimentally affect that bacterial oxidation brings to cyaniding, prolong the cycle index of gac, improved the golden rate of recovery greatly.

Below by embodiment the present invention is at length explained.

Description of drawings:

Fig. 1 is a process flow diagram of the present invention.

Specific embodiments

To contain arsenic about 3%, it is example that Kazakhstan of carbon containing 8-10% contains arsenic high-carbon ore deposit, transfer pulp density to 15-25%, PH=1-2, the control growing temperature is between 37-45 ℃, put into thiobacillus ferrooxidant, thiobacillus thiooxidans, the mixed bacterium of ferric oxide spirobacteria and heat-resisting thiobacillus thiooxidant, bacterium is with the sulphur in the mineral, iron is food and breeds, under the effect of bacterium, make the sulphur in the mineral, iron, oxidations such as arsenic, destroyed the dissociating of parcel mineral of gold, arsenic-containing ores is decomposed and is transformed in the liquid, after neutralizing treatment changes into the stable ferric arsenate of environmentally safe, the Tricalcium arsenate precipitation, gold mineral still exists and is exposed with solid-state, and the carbonaceous thing of ADSORPTION OF GOLD has been reduced the ability of carbonaceous thing ADSORPTION OF GOLD cyano complex in the ore by partial oxidation or passivation;

With washing of the ore pulp behind the above-mentioned bacterial oxidation and dehydration, add alkaline medium (as lime, caustic soda etc.) and be transformed into PH=10.5-11, the concentration of sizing mixing is 30-40%, adds strong oxidizer O in the ore pulp before the charcoal soaking technology ₂Or the mixture of superoxide and composite carbon inhibitor kerosene and some arene derivatives, stir pre-treatment, make organic carbon, inorganic carbon in the mineral obtain destroying, suppress to cover, the carbonaceous thing loses " robbing gold " effect.Carry out the charcoal soaking technology then and handle, charcoal soaking technology gac density reaches 25-40g/l, and than the charcoal soaking technology gac density height of routine, the leaching yield of gold is brought up to more than 90% by original 25%.Carry golden charcoal and reclaim gold according to the desorption method of routine.

Above-mentioned strong oxidizer can be O ₂, superoxide, subchloride etc., the composite carbon inhibitor can be mixture of kerosene, oil fuel and some arene derivatives etc., its consumption is different with the difference of mineralogical property, these additives have not only solved carbonaceous thing " misfortune gold " problem, and improved the detrimentally affect that bacterial oxidation brings to cyaniding, as: the macromolecule organic behind the microbial death is decomposed, thereby solved the low phenomenon of gold recovery that the micropore that emits groove phenomenon and organism to stop up gac causes.The adding of additive has replaced the use of defoamer, has prolonged the cycle index of gac, has improved the golden rate of recovery greatly.

Adopt treatment process of the present invention to handle and contain arsenic up to 8%, carbon containing experimentizes to domestic several places high arsenic refractory gold concentrate of carbon containing up to 10% gold mine, and the leaching yield of gold can reach more than 95%.

Claims (1)

1, a kind of high arsenic high-carbon gold mine treatment process, its process is:

(1) bacterial oxidation: adopt the mixed bacterium of thiobacillus ferrooxidant, thiobacillus thiooxidans, ferric oxide spirobacteria and heat-resisting thiobacillus thiooxidant, growth conditions: pulp density is 15-25%, PH=1-2, and growth temperature is 37-45 ℃;

(2) with washing of the ore pulp behind the bacterial oxidation and dehydration;

(3) the concentration 30-40% that sizes mixing adds alkaline medium and is transformed into PH=10.5-11;

(4) adding strong oxidizer and composite carbon inhibitor stir pre-treatment in ore pulp, make organic carbon, inorganic carbon in the mineral obtain destroying and suppressing;

(5) charcoal soaks;

(6) gold is reclaimed in the charcoal desorb.

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