CN1007624B - Recovery of gold from auriferous refractory iron-containing sulphidic ore - Google Patents

Abstract

The present invention relates to a process for recovering gold from sulfide containing ores, which comprises that crushed ore pulp is preprocessed by sulfuric acid, so impurities and carbonate which hinder oxidation are decomposed, and a sulfate solution and solid are obtained after solid-liquid separation. Water is added in the solid so as to prepare ore pump with the concentration of 25 to 60% (solid weight). The ore pulp is pressurized and oxidized at 135 to 250 DEG C and maintains the sulfuric acid concentration at 40 g/l so as to dissolve iron, the sulfide is oxidized into sulfuric acid, and less than 20% oxidized sulfur is simple substance. Water is added in the oxidized substance to prepare pulp containing 5 to 15 wt% of solid, and a ferrous acid containing solution and solid are obtained after solid-liquid separation. The solution circulates to a pulping procedure, the solid is washed and is processed via solid-liquid separation, and an iron and metal containing sulfuric acid and hydrochlric solution is circularly preprocessed. The gold is recovered from washed solid.

Description

Recovery of gold from auriferous refractory iron-containing sulphidic ore

The present invention relates to contain other metal that reclaims gold and may exist the golden sulfide ore from indissoluble.

As everyone knows, utilize the common process method, from then on cyanide process is for example planted and is extracted gold from the ore and unsatisfactory, and has precedingly proposed various pretreating schemes.But because a variety of causes, these pretreating schemes that propose in prior art all can not improve the effect that reclaims gold from such ore as desirable in industrial operation.

Therefore, the objective of the invention is to provide a kind of improved pretreatment process method that comprises pressure oxidation treatment to this ore.

Recovery gold provides a kind of processing method the golden iron content sulfide ore to containing from indissoluble in the present invention, this method comprises, at first the ground ore of moisture ore pulp form is sent into acid treatment operation in advance, in this step, handle ground ore with aqueous sulfuric acid, make wherein carbonate and gangue compound that can consumption acids decompose, otherwise these gangue compounds will have restraining effect to following pressure oxidation in the ore.Then, ore pulp to acid treatment carries out the solid-liquid separation first time, obtain sulfate liquor and the solid separated, in pulp step more for the first time, add water to the solid of separating and form its consistency scope and contain solid weight at 25%～60%() soup compound; In pressure oxidation, oxidation is the soup compound of pulp more for the first time, and the temperature condition of oxidation is 135 ℃～250 ℃, and preferable scope is 165 ℃～190 ℃.In the atmosphere of pressure oxidation, the sulfuric acid concentration that should keep simultaneously existing with free acid form is 5～40g/l, preferable scope is 5～15g/l, so that wherein ferro element dissolving, form sulfuric acid and in fact the compound oxidation of all oxidable sulphided form become the form of vitriol, the while is no more than the element sulphur of 20% oxidation in oxidation step, preferable is to be no more than 10%, is that the form with elementary sulfur exists; In pulp step more for the second time, add water to the ore pulp of oxidation and contain solid weight at 5%～15%(to form the consistency scope) between oxidation cross ore pulp; In second time solid-liquid separation step, to oxidation cross and once more pulp ore pulp carry out solid-liquid separation, be separated into the solid that separates of iron content acidic solution and oxidation; The iron content acidic solution is at least to the first time and one of pulp step again circulation for the second time; In washing step, wash the oxidized separate solid of solution washing with water; In solid-liquid separation step for the third time, washed solid is separated from the used washing soln that contains the acid and the vitriol of dissolved iron and non-ferrous metal, the exhausted washings reclaims gold to acid treatment step circulation in advance from washed solid.

In pressure oxidation, maintain the magnesium ion of q.s, make Mg in the solution: the mol ratio of Fe is at least between 0.5～1, this just advantageously causes in pressure oxidation sedimentary iron ion to tend to the form of rhombohedral iron ore rather than bigger with other solubleness, and the form precipitation of the compound of more metallic iron is arranged thus, and latter's iron cpd is a potential lime consumption compound.

This processing method also can comprise the gradation step, in the gradation step, a part of ore pulp gradation with at least one step in for the second time pulp step again and the washing step, the solid that surpasses predetermined size is separated from remaining ore pulp, the macrobead solid of telling is ground and enter acid treatment step in advance with the ground ore, all the other ore pulps turn back to the corresponding second time of pulp step again or washing step.

The isolated iron content acidic solution of solid-liquid separation step can be partly recirculated to pulp step more for the first time for the second time, is partly recirculated to pulp step more for the second time.

This processing method can also comprise in settling step to the isolated sulfate liquor of the separating step first time adds certain precipitation agent, metallic element wherein is precipitated out with the form of indissoluble vitriol and the arsenic form with the indissoluble arsenate with corresponding oxyhydroxide or hydrous oxide, sulfate ion, isolate throw out from remainder water solution, the aqueous solution after utilization part is at least separated is as the above-mentioned solid washing soln of separating after peroxidation.

Concrete for example with reference to the accompanying drawings narration the present invention, accompanying drawing is represented to contain the process flow sheet that golden sulfide ore reclaims gold and other metal from indissoluble.

With reference to the accompanying drawings, the indissoluble of handling in this specific examples contains and contains about 2～30(gram/ton in the golden sulfide ore) gold, about 0.5～85(gram/ton) silver, about 1.5%～20%(weight) iron, 25%～85%(weight) silicon-dioxide, 0.5%～8%(weight) sulphur, 0.01%～3.5%(weight) arsenic, be less than 0.01%～5%(weight) antimony, 0.5%～10%(weight) aluminium, 0.1%～5%(weight) calcium, 0.1%～10%(weight) carbonic acid gas, be less than 0.1%～10%(weight) magnesium and be less than 0.1%～1.5%(weight) carbon (organic).

The composition of the sulfide that this ore is contained is made up of following one or more materials, be the salt of the acid of pyrite, arsenopyrite, pyrrhotite, white antimony and multiple sulfur-bearing, it also can comprise the sulfide of lead, zinc and the copper of different quantities, in addition, and some ore also may contain oxidable carbon containing class ore.

After the initial fragmentation, adopt appropriate means that ore is ground into 70% for example, to use ball mill afterwards again grinding step 12 by 325 purpose Taylors (Tyler) sieves (particle is less than 44 microns) with semi-automatic pulverising mill.In multiviscosisty step 14, the ground ore pulp thickens to its bottom ore pulp consistency in 40%～60%(weight) between the solid.Top solution turns back to from multiviscosisty step 14 and grinds step 12, can add water in addition as needs.

In the pressure oxidation with narration, the compound of various sulfur-bearings is to emit considerable heat as pyrite and arsenopyrite, the compound of antimony and the oxidation of carbon compound in the back.The optimal oxidizable species kind of autoxidation can be provided for the solid of sending oxidation step to is contained, selectable flotation step 16 can be added grinding between step 12 and the multiviscosisty step 14.As previously described, proposing this feature is based on and recognizes, contain in the pressure oxidation pre-treatment of golden sulfide ore at indissoluble, the sulphur composition of the sulphided form in the ore is an important feature, particularly pyrite and arsenopyrite, the main thermopositive reaction during pressure oxidation comprise the sulphur of sulphided form all are oxidized to sulphate form.Although the oxidation of carbon containing class and antimony containing compounds is also important, is difficult to limit the character and the reactive behavior of carbon containing compounds, thereby has been found that the oxidation of sulphur is the main source of heat.

For example, the sulphur content of the sulphided form in the ground ore can change in very big multiple scope, its variation range is greatly about 1%～4%(weight) between, therefore, the sulphur content for sulphided form more desirable in the pressure oxidation is approximately 3%(weight).Like this, if the sulphur content of actual sulphided form is higher than 3%, the ground ore can be sent the flotation step 16 that has than the rough floatation form to, and the higher concentrate of the sulphur content after the flotation can be stored in concentrate and store 18, and the ore that meets after the flotation that sulphur content requires enters multiviscosisty step 14.If the sulphur content of sulphided form is lower than 3%, grinds protosulphide content ore pulp that step 12 produces and can store 18 high sulfur content ore pulp with concentrate and enter multiviscosisty step 14 as ore pulp.Alternative method also has, and concentrate is stored 18 high sulfur content ore pulp add among the low sulfur content ore pulp that grinds step 12.

The bottom ore pulp that the sulphur content that meets sulphided form that obtains from multiviscosisty step 14 requires enters into acid treatment step 20 in advance, in acid treatment step in advance, ore pulp acidic cleaning solution pulp again, used acidic cleaning solution is to obtain through the solid that washing is come out from pressure oxidation, and pressure oxidation will be narrated in the back.This acidic cleaning solution generally contains dissolved iron in the pressure oxidation of narrating below, aluminium, magnesium, arsenic and other non-ferrous metal, equally also contains sulfuric acid.Acidic treatment is decomposed the gangue impurity of carbonate and energy consumption acids in advance, otherwise these impurity hinder carrying out smoothly of pressure oxidation.Therefore in advance acid treatment step 20 reduced the consumption of acid in the pressure oxidation of back and in neutralization procedure 44 consumption of lime, concrete neutralization procedure will be narrated in the back.It should be noted that acid treatment step 20 used acid in advance are to produce in the pressure oxidation 30 of back.

Then in multiviscosisty step 22 with the ore pulp multiviscosisty that obtains, be mixed together with the top solution that comes out from pressure oxidation ore pulp multiviscosisty step at the bottom ore pulp of pulp step 24 again multiviscosisty step 22, pressure oxidation ore pulp multiviscosisty step is narrated in the back.This circulation can make that Mg content remains on the desired standard for the following purpose that will narrate in the liquid, and also circulated simultaneously ferric iron and acid make pulp pre-heating and adjusted its consistency, and desirable consistency is approximately 42%.

Enter settling step 26 for the first time from the top solution that multiviscosisty step 22 is come out, add Wingdale herein pH value is brought up to 5 and be settled out metal such as ferric iron, aluminium and arsenic, also remove the sulphur of sulphate form simultaneously with the form of gypsum.The residue slurries enter second settling step 27, at the settling step interpolation second time lime pH value are brought up to 10, are settled out magnesium and other metal.The slurries that obtain enter the multiviscosisty of multiviscosisty step 28 then, the purity of the upper liquid water that comes out from step 28 is enough to satisfy the use of resistates washing step after the pressure oxidation of narrating later, and its purity also satisfies the purpose of wastewater treatment.The thicker part in bottom is filtered in filtration step 30, and the water of separating turns back to the first step settling step 26, and the solid that leaches is handled as the ore deposit tail.

Deliver to pressure oxidation 30 from the ore pulp of pulp again that pulp step 24 once more obtains, in pressure oxidation, place one or more multicells to press hot vessel to handle ore pulp, keep about 160 ℃～200 ℃ temperature, and make its total pressure between 700～5000Kpa, and in acidity the ore oxidation that makes sulfur-bearing, arsenic and antimony under the vitriolic condition of 5～25g/l to indoor spray oxygen.Because the sulphur of unbound state is unfavorable to reclaiming gold, therefore becomes Oxidation Number to be higher than the Oxidation Number particularly important of elemental sulfur sulfide oxidation.In oxidation was carried out, iron was the transmission agent of effective oxygen.Therefore need enough iron to appear in the solution, especially in the initial reaction chamber of pressing hot vessel, these are by guaranteeing that sufficiently high stable acidity realizes.

In addition, will press the acidity and the temperature of hot vessel to be controlled to like this, by with sulfide, the compound of arsenic becomes higher oxidation state with the compound oxidation of antimony, realize that desirable gold separates out, and make the solid physical property of generation be convenient to the multiviscosisty and the flushing of back simultaneously.Though generally speaking can be by desirable method controlling acidity and temperature, also need sometimes to add acid or water and other cooling or heater means is provided in pulp step 24 again according to the ore composition.

When needing, if the sulphur content for example in the ore is lower than 5%(weight), the heat of the oxidized ore pulp that comes out from pressure oxidation 30 can be used for heating the feed slurry of coming out from pulp step 24 again.Oxidized ore pulp is normally discharged from press hot vessel apace, and formed steam can be used for heating the ore pulp of coming in again.It also is possible that the heat that the consistency of ore pulp is produced the oxidation of sulphur composition in the hot vessel of control pressure herein provides desired service temperature.

According to a further general feature of the present invention, have been found that, in order to reduce the lime requirement in the cyaniding neutralization procedure 24 before, wish to make very much hydrolysis and iron resolution of precipitate the form with rhombohedral iron ore in pressure oxidation 30 wanted, rather than precipitate with the form of ferric alkali formula vitriol or the yellow potassium ferrovanadium of hydronium(ion); And find in pressure oxidation, to keep sufficiently high Mg content can promote the precipitation of rhombohedral iron ore.

The result of pyritous pressure oxidation produces ferric sulfate (III) and sulfuric acid.Some ferric sulfate hydrolysis and with the form of mixtures precipitation of the yellow potassium ferrovanadium of rhombohedral iron ore, ferric arsenate, hydronium(ion), ferric subsulfate and these compounds.The character that contains iron compound that is settled out depends on following parameter.What, the quality and the character of the gangue impurity of the grade of acidity, slurries consistency, ore and consumption acids as temperature, total vitriol.Highly filled ore pulp, the pressure oxidation of the ore pulp in high-grade pyrite or arsenopyrite or the mixing ore deposit of the two generally can promote iron with ferric subsulfate, yellow potassium ferrovanadium of hydronium(ion) or ferric arsenate form precipitation.

Use processing method of the present invention, have been found that iron preferentially precipitates with the rhombohedral iron ore form in pressure oxidation 30, and caused in pressure oxidation 30, discharging better sour, make in first step settling step 26, can remove acid at an easy rate, so reduced the requirement of lime during cyaniding with Wingdale.Owing to following two reasons, be undesirable with the form precipitated iron of the yellow potassium ferrovanadium of ferric subsulfate or hydronium(ion) or these two mixture.First reason is that the unsettled vitriol of larger proportion (being potential lime consumption product) enters the more high flow rate that neutralization procedure 44 can cause lime.Second reason, the reaction of lime and ferric subsulfate and yellow potassium ferrovanadium, because ferruginous precipitation causes forming the viscous precipitate thing to the conversion of indissoluble oxyhydroxide and gypsum, increased solids content also because the adsorption of goo increases the loss of Jin Heyin.

Therefore find that the magnesium of q.s should be arranged in pressure oxidation 30, make the mol ratio of Mg in the solution: Fe be approximately 0.5: 1.0 at least, preferable is 1: 1.The estimated value of the acid-soluble magnesium that many auriferous pyrite contain can both satisfy above-mentioned part requirement to magnesium at least.In many examples, though by the flotation before the oxidation content of gold and sulfide is increased, so and reduced the Mg content that enters oxidation step 30.At least a portion of pressure oxidation 30 needed magnesium can be by carrying the method for acid pressure oxidation filter drop solution to provide from multiviscosisty step 34 to pulp step 24, and also available method from magniferous make up water to pulp step 24 that supply with provides.If desired, can after multiviscosisty step 28, heat for the second time settling step 27(shown in dotted outline in the schema), so that the thicker upper liquid that the residue washing step after pressure oxidation is provided contains magnesium ion, to achieve the above object.

After in pressure oxidation pressure hot vessel, suitably keeping for some time, for example about 1.5 hours, oxidized ore pulp enters pulp step 32 more fast, use herein ore pulp to be diluted to and be lower than 10%(and contain solid weight from top solution that multiviscosisty step 34 is come out), with effective utilization of the flocculation agent that obtains to add in pulp step 32 once more.This has also reduced the flocculation problems in the multiviscosisty step 34.Will be from the top solution that contains acid and iron that multiviscosisty step 34 is come out partly to pulp step 32 circulation again, part is to the foregoing step 24 of pulp again circulation.

Pour into mode to be about 4: 1 flushing ratio secondary flushing from bottom solid that multiviscosisty step 34 is come out in washing step 36 and 40 usefulness adverse currents.At washing step 36 first time, use from top solution flushing that rinse step 40 later thickeners 42 the come out second time from bottom solid that multiviscosisty step 34 is come out.The acidic solution that washing step 36 obtains from the first time is separated at multiviscosisty step 38 and solid, and be recycled in the foregoing acid treatment step in advance 20, if desired, wherein a part is also capable of circulation to pulp step 24 or 32 again, and perhaps 24 and 32.

In second time washing step 40, use the water that comes out from multiviscosisty step 28 to wash from the bottom solid that thickener 38 obtains, just from the top solution of multiviscosisty step 22, be settled out the relative purified water (mentioned as the front, and wherein may contain magnesium ion) that obtains after metal and the vitriol.The ore pulp that secondary washing is crossed continues to enter into multiviscosisty step 42, and the top solution circulated of multiviscosisty step 42 is to foregoing first time of washing step 36, and the bottom solid is delivered to neutralization procedure 44.

If desired, by the part ore pulp of pulp step 32 pulp again can be before arriving multiviscosisty step 34 warp let-off sizer 33(for example rotate sizer).Sizer 33 is by the size gradation of predesignating, and overdimensioned raw material grinds and be recycled to multiviscosisty step 14 once more grinding step 35.This kind technical characterictic can increase the recovery of gold, otherwise, increase the gold that reclaims and in the raw material of relatively large size, lose, because in pressure oxidation, it had been finished satisfied processing in the past.

At neutralization procedure 44, add lime with in and solid acidity, and pH value brought up to the degree that is suitable for cyaniding, promptly be approximately 10～12, preferably be approximately 10.5.The water that also can add the tail vat pool, ore deposit to reach the desired consistency of cyaniding, promptly is approximately 40%～45%(and contains solid weight).

The ore pulp that neutralized enters secondary cyaniding step 46, adds cyanide solution in the first step cyaniding stage.The filterable ore pulp of drop (leaching crosses about 60%～95%) is added to carbon leaching absorption group (eight-stage carbon-inleach adsorption) 48 in eight grades pouring-type to a certain extent, with complete leaching and reclaim dissolved gold and silver-colored.Afterwards, the block that filters out with filtration step 30 of unworthy ore pulp is handled as the ore deposit tail by pulp once more.Load-carrying carbon is delivered to metal recovery step 50, uses lotus property cyanide solution peel load carbon under pressure.From eluant, reclaim Jin Heyin with electrowinning or other suitable method.Carbon after peeling off is regenerated in kiln, carbon Filtration Adsorption step 48 in sending back to after the screening.

Embodiment

Raw materials used is the indissoluble gold containing ore, is ground into 95% repeatedly and reaches 88 microns (180 sieve meshes), wherein contains golden 7.2g/l, by weight 1.6% arsenic, 3.6% carbonic acid gas, 9.2% iron, 36% silicon-dioxide and 4.6% sulphur.The extracted amount that utilizes conventional cyanide process gold is 68%.

Ore is along a continuous route processing, and pressing hot vessel feed system, a quiet volume comprising feed slurry is anticipated jar and thickener, one are used for bottom ore pulp in the pulp pre-treatment thickener the jar of pulp once more, one is 106 four constant pressure hot vessel, a pressure hot vessel discharge system, an oxidation thickener charging stock tank, an oxidation thickener and an adverse current decantate device of being made up of two thickeners and their charging stock tanks separately.The continuous route of processing ore also comprises a pH value adjustment jar, six grades of fineization leachings and is used for the absorption of gold and six grades of carbon leachings of the slurry that reclaims later.The waste acid liquor that comes out from the pre-treatment thickener in precipitation process with Wingdale and lime treatment, with arsenate, metal hydroxides, the form of hydrous oxide and gypsum is settled out arsenic, metal and the vitriol that is associated.Post precipitation carries out solid-liquid separation step, so that make the solution circulated of removing metal to the washing loop.

Containing the water of solid 55% and ore pulp top solution-treated with the acidic cleaning thickener in the pre-treatment jar of ore composition also dilutes.Impurity partial reaction in acid and the ore discharges the carbonate composition in a part of ore.Carry out solid-liquid separation then in thickener, its top solution is delivered to precipitation process removing dissolved metal and vitriol, and is used for washing process as the solution of removing metal.Contain solid 53%(weight) the pre-treatment thickener in the bottom ore pulp, use the acidic solution of the heat of from the oxidation thickener, coming out to be diluted to and contain solid 30%(weight) ore pulp.The effect of this step is that self heat that residual carbon hydrochlorate piece, the dilution ore pulp before the preheating oxidation feed slurry, decomposition pressure heat effect reaches with oxidizing reaction its solids content needs corresponding to degree, provides acid and iron to react with promotes oxidn.Then, ore pulp enters first chamber of pressing hot vessel, and to pressing the hot vessel spray oxygen of having family, oxidizing reaction is carried out under the pressure of 185 ℃ temperature and 1850Kpa.Solid continues 100 minutes in pressing hot vessel.

Extract sample from press the hot vessel chamber, obtain the degree of oxidation of certain sulphur, the releasing degree of gold can be determined by oxidized sample solid being carried out cyaniding correction test.The extraction ratio data that the composition of representational autoclave solution, sulphur are oxidized to the gold that obtains under the degree of vitriol, the continuous pressure oxidation condition is expressed as follows.

The oxidizing solution cyaniding

The residual extraction of g/l

Chamber sequence number Fe Fe H ₂SO ₄The oxidation % g/t Au % Au of sulphur

1 0.2 0.2 7.6 53 1.10 85

2 0.4 0.2 10.2 58 0.97 87

3 1.7 0.1 16.2 95 ＜0.2 ＞98

4 1.2 0.1 15.8 99 ＜0.2 ＞98

The ore pulp of oxidation enters oxidation thickener charging stock tank after discharging by tundish, uses the part top solution dilution that comes out from the oxidation thickener to containing solid 10% herein, enters the oxidation thickener then.The part of the top solution in the oxidation thickener is recycled to presses the hot vessel feed slurry preparatory stage, and a part is recycled to oxidation thickener charging stock tank.By twice flushing, the oxidizing acidic solution after the flushing is recycled to the ore pretreatment stage to bottom solid in the oxidation thickener in the CCD process.The bottom ore pulp that washs in the post-thickener for the second time contains solid 50%, and the carbon treating processes is so that reclaim gold in handling and starch through cyanide process.

The technology skilful person who specializes for the present technique field of the example that the present invention is other also will understand at an easy rate, and scope of the present invention is limited by appended claims.

Claims (11)

1, reclaiming golden processing method from the sulfide ore of auriferous refractory iron-containing comprises:

With moisture ore pulp form the ground ore is fed acid treatment step in advance;

In acid treatment step in advance with aqueous sulfuric acid handle the ground ore with decomposing carbonate and can the ore of consumption acids in the gangue impurity compound;

The ore pulp of handling is carried out the solid-liquid separation first time, isolate sulfate liquor and isolate solid;

Adding water to form the ore pulp that the consistency scope is approximately 25%～60% (solid weight) to isolated solid in the pulp step more for the first time;

The oxidation ore pulp of pulp more for the first time in pressure oxidation, the magnesium ion that capacity will be arranged in the ore pulp, oxidation is under about 135 ℃～250 ℃ temperature, in pressure oxidation atmosphere, carry out, simultaneously and keep the sulfuric acid of about 5～40g/1 of existing with free acid form so that dissolved ferric iron, generate sulfuric acid, and make all oxidable sulfide oxidations become the form of vitriol basically; The sulphur that is less than 20% oxidation exists with the elementary sulfur form.

Adding water to the ore pulp of oxidation in pulp step more for the second time makes it become that oxidation that the slurry denseness is approximately 5%～15% (weight) is crossed and the ore pulp of pulp once more;

Oxidation is crossed and the ore pulp of pulp once more carries out the solid-liquid separation second time, and isolated is the solid of separating of iron content acidic solution and oxidation;

The iron content acidic solution at least to the pulp first time and a pulp step cycle in the pulp step for the second time;

Wash the separate solid of solution washing oxidation with water at washing step;

In solid-liquid separation step for the third time, with washed solid from used contain acid and be dissolved with iron and the washings of non-ferrous metal vitriol separate.

With used contain acid and be dissolved with iron and the washing soln of non-ferrous metal vitriol to the circulation of acid treatment step in advance;

From washed solid, reclaim gold.

2, according to the described processing method of claim 1, comprising in pressure oxidation, keeping ore pulp to contain the magnesium ion of q.s, make the molar ratio of the Mg in the solution: Fe be approximately 0.5: 1～10: 1, so that iron is trended towards in pressure oxidation with the form of rhombohedral iron ore rather than with the form precipitation of the compound of other insoluble iron.

3, processing method according to claim 1, comprising the gradation step, at least some ore pulp at least that comes out from for the second time one of pulp step again and washing step is through gradation step, to from remaining ore pulp, separate above the pulp solids of predetermined size, the solid that surpasses predetermined size that to separate is again worn into smaller size, then it is sent into acid treatment step in advance with initial ore pulp, the remaining ore pulp that meets size behind the gradation turns back to the corresponding second time of pulp step again and washing step.

4, processing method according to claim 1, to pulp step cycle more for the first time, part is to pulp step cycle more for the second time comprising the isolated iron content acidic solution part of solid-liquid separation step for the second time.

5, processing method according to claim 1, comprising adding precipitation agent to the isolated sulfate liquor of the separating step first time at settling step, make them become the form of the oxyhydroxide of metal or hydrous oxide again with the precipitation metallic element, and the form sulfate precipitate radical ion of indissoluble vitriol and with the form arsenic precipitation of indissoluble arsenate, isolate throw out from remaining aqueous solution, at least some remaining aqueous solution of separating are as the washing soln of the separate solid of washing oxidation.

6, processing method according to claim 2, comprising adding precipitation agent at the settling step sulfate liquor that regeneration step is come out to the first time, the pH value brought up to be approximately 5～8.5 so that the dissolved substance expected precipitation, and magnesium ion is retained in the solution; At least use some solution that contains magnesium ion in the washing of the solid of said oxidation of separating as water washing solution, so that in the washings that recycles, provide magnesium ion.

7, processing method according to claim 1, the used washing soln of wherein some is to pulp step more for the first time and at least one step cycle in the pulp step more for the second time.

8, processing method according to claim 1, wherein the heat of oxidation step generation is used for the feed slurry of heated oxide step.

9, processing method according to claim 1 makes comprising the ore pulp consistency of controlled oxidation step, and the heat energy that is produced by the composition oxidation of institute's sulfur-bearing produces desirable oxidizing temperature condition.

10, processing method according to claim 1, wherein to for the first time again the oxidation of the ore pulp of pulp be under 165 ℃～190 ℃ temperature condition, to carry out.

11, processing method according to claim 1 wherein to for the first time again during the ore pulp oxidation of pulp, keep being approximately with the concentration of free acid the vitriolic condition of 5～15g/l.

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