CN101629245A - Zinc hydrometallurgical process of iron removal by neutralization hydrolysis - Google Patents
Zinc hydrometallurgical process of iron removal by neutralization hydrolysis Download PDFInfo
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Abstract
The invention relates to a zinc hydrometallurgical process of iron removal by neutralization hydrolysis for smelting zinc and indium from zinc roasting-sand smoke dust, which belongs to the technical field of nonferrous metal smelting technology. The zinc hydrometallurgical process comprises the following working procedures: A. leaching section, i.e., a weak acid leaching working procedure and a strong acid leaching working procedure; and B. neutralization hydrolysis working procedure, i.e., delivering weak acid leached supernatant to the neutralization hydrolysis working procedure, adding neutralizing agent of calcium hydroxide or calcium carbonate for neutralization hydrolysis for iron removal, then delivering neutralization hydrolyzed supernatant the purifying working procedure and the electrodeposit working procedure for extracting zinc; piling and storing neutralization hydrolyzed iron residues when no indium is included, and delivering neutralization hydrolyzed iron residues to the pickling working procedure when indium is included, and delivering pickling supernatant to a traditional centrifugal-extraction indium-extracting system for indium extraction. The invention shortens the process flow of the zinc hydrometallurgy (including indium extraction), invents a method for removing iron in normal temperature and comprehensively recycling the zinc and the indium without coal consumption in normal temperature, and achieves the purposes of saving energy, reducing consumption, reducing the zinc and indium production cost and having good impurity removing effect and the like. The invention also provides a process flow simply linked with the traditional process.
Description
[technical field]
The present invention relates to a kind of non-ferrous metal smelting technical field, particularly a kind of from the zinc baking sand flue dust a kind of neutralizing hydrolysis of zinc metallurgy indium remove the iron processes smelting process.
[background technology]
Present domestic existing Zinc hydrometallurgy process, mainly contain conventional method smelting process, jarosite process smelting process and low-grade high-iron zinc sulfide concentrate comprehensive utilizating research technology etc., these several Zinc hydrometallurgy process common ground are: (1) after leaching section leaches to greatest extent, sends to purification, electrodeposition extraction zinc to the zinc in the zinc baking sand flue dust with zinc-containing solution; (2) need to obtain flue dust and reclaim the zinc indium with waving of rotary kiln iron vitriol slag, acid leaching residue.Its difference is the method for removing iron difference: as conventional method smelting process and low-grade high-iron zinc sulfide concentrate comprehensive utilizating research process using is that rotary kiln evaporation obtains that flue dust reclaims the zinc indium and iron stayed the purpose that reaches deironing in the slag; And the jarosite process smelting process is by heavy alum operation deironing, obtains flue dust by waving of rotary kiln iron vitriol slag again and reclaims the zinc indium, and iron is stayed in the slag.These several Zinc hydrometallurgy process common shortcomings are that technical process is long, and the zinc indium reclaims technological process and needs wet method, pyrogenic process and usefulness; Iron removal step all needs the consumption coal of heating, and the jarosite process smelting process also consumes bicarbonate of ammonia.Therefore, cause above-mentioned several Zinc hydrometallurgy process and shortcomings such as the technical process of subsequent recovery zinc indium is long, energy consumption is high, zinc indium production cost height, deficiency in economic performance.
[summary of the invention]
The technical problem to be solved in the present invention is: provide a kind of deironing not heat, comprehensively reclaim the zinc indium and do not heat and do not consume the neutralizing hydrolysis that coal, technical process are short, zinc indium production cost is low, energy-saving and cost-reducing, environmental pollution is little and remove the iron processes smelting process, to solve that energy consumption height, technical process that above-mentioned several existing Zinc hydrometallurgy process exists are grown and problem such as zinc indium production cost height.
The technical scheme that solves its above-mentioned technical problem is: a kind of neutralizing hydrolysis removes the iron processes smelting process, adopts Zinc hydrometallurgy process, comprises following operation:
A, leaching section: described leaching section comprises that low acidleach goes out operation and peracid leaches operation, soon zinc baking sand flue dust, Manganse Dioxide and electrolysis waste solution, peracid leach supernatant liquor, the low acidleach of the direct adding of sulfuric acid goes out operation, the low acidleach of output goes out supernatant liquor and sends into the neutralizing hydrolysis operation, and the low acidleach of output goes out underflow and waste electrolyte, sulfuric acid add peracid leaching operation; The peracid leaching supernatant liquor of output returns low acidleach and goes out operation; The peracid of output leaches the underflow press filtration, and the filtrate of output is returned low acidleach and gone out operation, and the peracid leached mud of output is stored up or sent back to and receive tin, lead, silver;
It is as follows that low acidleach goes out the operation technology condition: reaction beginning acid: 120～150g/L, and the reaction times: 55～65 minutes, temperature of reaction: 65～75 ℃, reaction is acid eventually: 5～20g/L, solid-to-liquid ratio is 1: 8～12;
It is as follows that peracid leaches the procedure technology technical qualification: reaction beginning acid: 150～160g/L, and the reaction times: 2～3 hours, temperature of reaction: 90～95 ℃, reaction is acid eventually: 50～60g/L, solid-to-liquid ratio is 1: 6～8;
B, neutralizing hydrolysis operation: low acidleach goes out supernatant liquor and sends into the neutralizing hydrolysis operation, adds neutralizing agent calcium hydroxide or lime carbonate and carries out the neutralizing hydrolysis deironing, and the neutralizing hydrolysis supernatant liquor of output is sent into purification, the electrodeposition operation is extracted zinc; When the neutralizing hydrolysis scum that obtains is stored up when not containing the indium scum,, the neutralizing hydrolysis scum that obtains carries indium when sending acidleach operation, the acidleach supernatant liquor of output to send when containing the indium scum to pass Centrifugical extraction to put forward the indium system;
Neutralizing hydrolysis procedure technology technical qualification are: reaction beginning acid: 5～50g/L, temperature of reaction: 5～90 ℃, the reaction times: 30～90 minutes, reaction is acid eventually: PH=4.8～5.4, solid-to-liquid ratio: 1: 6～8.
Further technical scheme of the present invention is: the neutralizing hydrolysis scum that obtains in the described neutralizing hydrolysis operation is for containing the indium scum, and iron indium slag send acidleach operation adding sulfuric acid to carry out acidleach, and the acidleach supernatant liquor send traditional Centrifugical extraction to put forward the indium system and extracts indium; The raffinate that obtains in the Centrifugical extraction operation is sent into the zinc recycle section and is reclaimed zinc;
The technical qualification of described acidleach operation are: reaction beginning acid: 60～130g/L, and temperature of reaction: 5～90 ℃, the reaction times: 30～90 minutes, reaction is acid eventually: 9～50g/L, solid-to-liquid ratio: 1: 6～8;
Described centrifugal extracting process technical qualification: organic phase proportioning: 30%P204+ kerosene; Extraction progression: 2 grades; Compare: organic phase/water=1/14～15.
Further technical scheme of the present invention is: the raffinate that obtains in the Centrifugical extraction operation is sent into the zinc recycle section and is reclaimed zinc, raffinate zinc recycle section comprises the raffinate iron removal step, raffinate sinks the zinc operation, the molten operation of raffinate acid, being about to raffinate send iron removal step adding neutralizing agent calcium hydroxide or lime carbonate to carry out the neutralizing hydrolysis deironing, the deironing supernatant liquor of output send heavy zinc operation to add neutralizing agent calcium hydroxide or lime carbonate carries out the heavy zinc of neutralizing hydrolysis, the heavy zinc underflow that the heavy zinc of neutralizing hydrolysis is obtained send sour molten operation to add slag washing water at last, electrolysis waste solution, it is molten that sulfuric acid carries out acid, and the sour molten supernatant liquor that obtains send cleaning section;
Raffinate iron removal step technology condition is: reaction beginning acid: 9～50g/L, and temperature of reaction: 5～40 ℃, the reaction times: 30～60 minutes, reaction is acid eventually: PH=4.8～5.4, solid-to-liquid ratio were controlled between 1: 6～8;
The heavy zinc procedure technology technical qualification of raffinate are: the acid of reaction beginning: PH=4.8～5.4, and temperature of reaction: 5～40 ℃, the reaction times: 30～60 minutes, reaction is acid eventually: PH=6.5～9, solid-to-liquid ratio were controlled between 1: 6～8;
The molten procedure technology technical qualification of raffinate acid are: reaction beginning acid: 120～150g/L, temperature of reaction: 5～40 ℃, the reaction times: 30～60 minutes, reaction is acid eventually: PH=4.8～5.4, solid-to-liquid ratio were controlled between 1: 6～8.
Neutralizing hydrolysis operation of the present invention, acidleach operation reactive group present principles following (low acidleach of the present invention go out operation, peracid leach operation, Centrifugical extraction to carry indium workshop section be that traditional technology no longer describes in detail herein):
1, neutralizing hydrolysis operation: be exactly to go out in the supernatant liquor adding neutralizing agent calcium hydroxide or lime carbonate carries out neutralizing hydrolysis deironing and heavy indium in low acidleach, with low acidleach go out ferric ions a large amount of in the supernatant liquor, the trivalent indium ion all is Fe (OH)
3, In (OH)
3Hydrolysis is also removed with detrimental impurity silicon, arsenic, antimony, selenium flocking settling, and to reach the effectively purpose of open circuit of removal of impurities to greatest extent and impurity, its reaction mechanism is shown in the reaction formula of following (1)～(6):
(1) neutralization is that low acidleach is gone out H in the supernatant liquor
2SO
4With Ca (OH)
2Or CaCO
3Neutralization generates CaSO
4.2H
2The O precipitation, reaction formula is as follows:
That is: (1) Ca (OH)
2+ H
2SO
4=CaSO
4.2H
2O ↓
(2)2CaCO
3+2H
2SO
4+2H
2O＝2CaSO
4.2H
2O↓+2CO
2↑
(2) hydrolysis is the Fe in the solution
2(SO
4)
3And In
2(SO
4)
3By adding Ca (OH)
2Or CaCO
3PH=4.8～5.4 in the control solution make Fe
2(SO
4)
3Hydrolysis generates Fe (OH)
3Precipitation and make In
2(SO
4)
3Hydrolysis generates In (OH)
3Precipitation; The combined reaction formula is as follows:
That is: (3) Fe
2(SO
4)
3+ 3Ca (OH)
2+ 6H
2O=2Fe (OH)
3↓+3CaSO
4.2H
2O ↓
(4)Fe
2(SO
4)
3+3CaCO
3+9H
2O＝2Fe(OH)
3↓+3CaSO
4.2H
2O↓+3CO
2↑
(5)In
2(SO
4)
3+3Ca(OH)
2+6H
2O＝2In(OH)
3↓+3CaSO
4.2H
2O↓
(6)In
2(SO
4)
3+3CaCO
3+9H
2O＝2In(OH)
3↓+3CaSO
4.2H
2O↓+3CO
2↑
2, acidleach operation: the iron indium in the iron indium slag that is exactly with sulfuric acid the neutralizing hydrolysis operation to be obtained leaches; Shown in reaction mechanism following (1), (2) reaction formula.
That is: (1) 2Fe (OH)
3+ 3H
2SO
4=Fe
2(SO
4)
3+ 6H
2O
(2)2In(OH)
3+3H
2SO
4＝In
2(SO
4)
3+6H
2O
The invention has the beneficial effects as follows:
1, the present invention has shortened the flow process of zinc hydrometallurgy (contain extraction and carry indium) technology, cuts down the consumption of energy and zinc indium production cost; A kind of neutralizing hydrolysis of the present invention removes the iron processes smelting process, its deironing, recovery zinc indium do not need to reclaim zinc indium workshop section and heavy alum operation from acid leaching residue, iron vitriol slag through rotary kiln evaporation (deironing) flue dust of high energy consumption, can shorten zinc hydrometallurgy (contain extraction and carry indium) technical process widely; Can under 5～90 ℃ temperature, carry out with the hydrolysis iron removal in it, but under room temperature (promptly 5～40 ℃), carry out, not consume the purpose of coal to realize that deironing is not heated for energy-saving and cost-reducing first-selection; Neutralizing hydrolysis iron removal of the present invention does not more need additives such as bicarbonate of ammonia; Iron indium slag reclaims the zinc indium can carry out the acidleach operation under 5～90 ℃ temperature, but carries out under room temperature (promptly 5～40 ℃) for energy-saving and cost-reducing first-selection, does not consume the purpose of coal to realize that acidleach is not heated; The acidleach supernatant liquor can directly be sent into traditional Centrifugical extraction through twice press filtration and sand filtration and put forward the indium system and carry indium; Zinc per ton can be saved mark coal 774kg～1040kg, can reduce zinc hydrometallurgy indium total production cost 15～20%.
2, good impurity removing effect: the present invention goes out operation and peracid with valuable metal zinc indium in the zinc baking sand flue dust and detrimental impurity elemental iron, silicon, germanium, arsenic, antimony, selenium etc. by low acidleach and leaches operation and leach, zinc indium and detrimental impurity elemental iron, silicon, germanium, arsenic, antimony, selenium etc. are all focused on low acidleach to be gone out in the supernatant liquor, utilize the neutralizing hydrolysis iron removal step then, low acidleach is gone out ferric ion a large amount of in the supernatant liquor (Fe can up to 25g/L) and the trivalent indium ion all is Fe (OH) 3, In (OH)
3Hydrolysis is also removed (referring to experiment subordinate list one) with detrimental impurity silicon, arsenic, antimony, selenium flocking settling, to reach the effectively purpose of open circuit of removal of impurities to greatest extent and impurity, finally can solve the zinc electrodeposition that causes because of selenium and burn plate problem.
3, the neutral operation that leaches of cancellation: the present invention has cancelled the neutrality leaching operation that arrives commonly used in the existing Zinc hydrometallurgy process, this technology is the zinc baking sand flue dust all to be gone out operation from low acidleach add, the PH that the concentration that low acidleach is gone out reaction beginning acid in the operation is brought up to 120-150g/L and improved the neutralizing hydrolysis iron removal step (promptly drops to neutralizing hydrolysis supernatant liquor iron content below the 10mg/L to 4.8-5.4, just can reach the neutral purpose of soaking operation of cancellation) get final product, other procedure technology technical qualification need not change, and just can reach the neutral purpose that leaches the operation shortened process of cancellation.
4, can finish very simply with being connected of existing technology: the present invention and conventional wet zinc metallurgy, the extraction indium-extracting process is compared, technological process is more or less the same, different is: leach with sulfuric acid with neutralizing hydrolysis iron removal step and neutralizing hydrolysis iron indium slag (1), and acidleach supernatant liquor Centrifugical extraction is carried the siderotil method iron removal step of indium replaceable operation chain conventional wet zinc metallurgy, E.Z separation of iron in goethite form operation and dual alternative conventional method smelting process and low-grade high-iron zinc sulfide concentrate comprehensive utilizating research technology are from acid leaching residue, iron vitriol slag gets zinc indium flue dust and subsequent recovery zinc indium operation through rotary kiln evaporation (deironing); (2) the acidleach supernatant liquor is after Centrifugical extraction is carried indium, and raffinate reclaims zinc after deironing; The acid leaching residue of (3) acidleach operation output is that the calcium sulfate slag is sold; Raffinate neutralizing hydrolysis deironing hydrochloric acid for dreg leaches recyclable iron oxide red and output calcium sulfate and goes out to sell, the calcium chloride of output and sulfuric acid reaction must regenerate hydrochloric acid and calcium sulfate sale; The integrated artistic flow process is unimpeded, pollutes for a short time, does not exist the technical program and the conventional wet zinc metallurgy operation problem that can not be connected up and down.
Below, the technical characterictic that a kind of neutralizing hydrolysis of the present invention is removed the iron processes smelting process is further described in conjunction with the accompanying drawings and embodiments.
[description of drawings]
Fig. 1: a kind of neutralizing hydrolysis of the embodiment of the invention one and embodiment two removes iron processes zinc metallurgy (no extraction of indium) process flow sheet;
Fig. 2: a kind of neutralizing hydrolysis of the embodiment of the invention three and embodiment four removes iron processes zinc metallurgy (containing extraction of indium) process flow sheet.
[embodiment]
Embodiment one:
A kind of neutralizing hydrolysis removes iron processes smelting process (referring to Fig. 1), adopts Zinc hydrometallurgy process, comprises following operation:
A, leaching section: described leaching section comprises that low acidleach goes out operation and peracid leaches operation;
A1, low acidleach go out operation: peracid is leached supernatant liquor and waste electrolyte, sulfuric acid add low sour leaching vat and go out beginning acid requirement by low acidleach and prepare and hang down acidleach and go out preceding liquid, and heat and add Manganse Dioxide after 50 ℃ and add the zinc baking sand flue dust again and leach, natural reaction heat when reaction (promptly spontaneous heat) is to 65～75 ℃, 55～65 minutes reaction times; The low acidleach of output goes out ore pulp and send low acidleach to go out dense groove to sink clearly, going out supernatant liquor through the heavy low acidleach that obtains clearly send low acidleach to go out the supernatant storage tank, send the neutralizing hydrolysis operation to carry out molten iron again and separate precipitation, obtain low acidleach and go out underflow and send peracid to leach operation to leach zinc again.The add-on of Manganse Dioxide is determined according to ferrous content.
Principal reaction formula: ZnO+H
2SO
4=ZnSO
4+ H
2O.
2FeSO
4+MnO
2+2H
2SO
4＝Fe
2(SO
4)
3+MnSO
4+2H
2O。
It is as follows that low acidleach goes out the operation technology condition: reaction beginning acid: 120～150g/L, the reaction times: 55～65 minutes, temperature of reaction: 65～75 ℃, reaction is acid eventually: 5～20g/L, solid-to-liquid ratio was controlled between 1: 8～12.
A2, peracid leach operation: waste electrolyte, sulfuric acid adding peracid leaching vat are prepared peracid by peracid leaching beginning acid requirement leach preceding liquid, adding low acidleach again goes out underflow and heats to 90～95 ℃ of afterreaction 2～3h, the output peracid leaches ore pulp and send peracid to leach dense groove to sink clearly, send peracid leaching supernatant liquor storage tank to send low acidleach to go out operation again through the heavy peracid leaching supernatant liquor that obtains clearly, obtain peracid leaching underflow and send press filtration, output filtrate send peracid leaching supernatant liquor storage tank to send low acidleach to go out operation again, and press filtration output peracid leached mud is stored up or sent back to and receive tin, lead, silver.
Principal reaction formula: ZnO.Fe
2O
3+ 4H
2SO
4=ZnSO
4+ Fe
2(SO
4)
3+ 4H
2O
It is as follows that peracid leaches the procedure technology technical qualification: reaction beginning acid: 150～160g/L, the reaction times: 2～3 hours, temperature of reaction: 90～95 ℃, reaction is acid eventually: 50～60g/L, solid-to-liquid ratio was controlled between 1: 6～8.
B, neutralizing hydrolysis operation: will hang down acidleach and go out supernatant liquor and join in the neutralizing hydrolysis iron removal trough, slowly add neutralizing agent calcium hydroxide or lime carbonate again and carry out the neutralizing hydrolysis deironing, the neutralizing hydrolysis deironing ore pulp of output send dense groove heavy clear, after the neutralizing hydrolysis supernatant liquor of output send neutralizing hydrolysis supernatant liquor storage tank, send purification, electrodeposition operation to extract zinc again; After the neutralizing hydrolysis underflow of dense groove output (not containing indium) send press filtration, filtrate to send hydrolysis supernatant liquor storage tank, send purification, electrodeposition operation to extract zinc again; The neutralizing hydrolysis scum of press filtration output adds water again and carries out the pulping and washing press filtration, and the neutralizing hydrolysis scum that obtains does not promptly have the indium scum to be stored up or reclaim iron oxide red and calcium sulfate and sell, and the slag washing water of press filtration output send neutralizing hydrolysis supernatant storage tank to send purifications, electrodeposition operation extraction zinc.
Neutralizing hydrolysis procedure technology technical qualification are as follows: reaction beginning acid: 5～10g/L, and temperature of reaction: 20～60 ℃, the reaction times: 30～60 minutes, reaction is acid eventually: PH=4.8～5.0, between the solid-to-liquid ratio 1: 6～8.
Embodiment two:
A kind of neutralizing hydrolysis removes iron processes smelting process (referring to Fig. 1), adopts Zinc hydrometallurgy process, comprises following operation:
A, leaching section: its concrete operations step and technology condition are identical with embodiment one;
B, neutralizing hydrolysis operation: its concrete operations step is identical with embodiment one, and difference is:
Neutralizing hydrolysis procedure technology technical qualification are as follows: reaction beginning acid: 10～20g/L, and temperature of reaction: 5～40 ℃, the reaction times: 40～65 minutes, reaction is acid eventually: PH=5.0～5.2, between the solid-to-liquid ratio 1: 6～8.
Embodiment three:
A kind of neutralizing hydrolysis removes iron processes zinc metallurgy (containing extraction of indium) technology (referring to Fig. 2), adopts Zinc hydrometallurgy process, comprises following operation:
A, leaching section: its concrete operations step and technology condition are identical with embodiment one;
B, neutralizing hydrolysis operation: its concrete operations step is identical with embodiment one, and difference is: the neutralizing hydrolysis scum of dense groove output is sent into the acidleach operation and is carried out acidleach for containing indium scum (being neutralizing hydrolysis underflow filter-press residues);
Neutralizing hydrolysis procedure technology technical qualification are as follows: reaction beginning acid: 15～30g/L, and temperature of reaction: 10～40 ℃, the reaction times: 45～70 minutes, reaction is acid eventually: PH=5.2～5.3, between the solid-to-liquid ratio 1: 6～8.
C, acidleach operation: at first pickling supernatant liquor, sulfuric acid are added pickling tank and prepare liquid before the acidleach, add neutralizing hydrolysis iron indium slag (being neutralizing hydrolysis underflow filter-press residues) again and carry out acid-leaching reaction by the acid requirement of acidleach beginning; The acid leaching ore pulp of output send the dense groove of acidleach to sink clearly, and the acidleach supernatant liquor of output send acidleach supernatant liquor storage tank to send traditional Centrifugical extraction to put forward the indium system after twice press filtration and sand filtration and extracts indium through Centrifugical extraction, anti-indium, displacement, indium electrodeposition, founding operation; The raffinate that the Centrifugical extraction operation obtains is sent into the zinc recycle section and is reclaimed zinc; The organic phase of anti-indium operation output is returned use through anti-iron, after washing chlorine; The acidleach underflow of output send pickling process.
Acidleach procedure technology technical qualification are as follows: reaction beginning acid: 60～100g/L, and temperature of reaction: 5～40 ℃, the reaction times: 30～70 minutes, reaction is acid eventually: 9～30g/L, solid-to-liquid ratio is controlled between 1: 6～8;
D, pickling process: at first secondary slag washing water, acidleach underflow adding pickling tank are added sulfuric acid again and carry out pickling under room temperature (promptly 5～40 ℃), the pickling ore pulp of output send dense groove heavy clear, liquid was used before the pickling supernatant liquor of output sent pickling supernatant storage tank to send acidleach operation complex acid to soak, the pickling underflow send press filtration, liquid was used before the filtrate of output sent acidleach operation complex acid to soak, the pickling slag of output pulp is again washed the calcium sulfate sale that press filtration again obtains, and liquid was used before the pickling slag secondary pressing filtering liquid (being the secondary slag washing water) of output sent the pickling process complex acid to wash.
Principal reaction formula: 2Fe (OH)
3+ 3H
2SO
4=Fe
2(SO
4)
3+ 6H
2O and
2In(OH)
3+3H
2SO
4＝In
2(SO
4)
3+6H
2O。
The pickling process technology condition is as follows: reaction beginning acid: 10～15g/L, temperature of reaction: 5～40 ℃, the reaction times: 30～60 minutes, reaction is acid eventually: 5～8g/L, solid-to-liquid ratio: 1: 6～8.
E, raffinate reclaim zinc workshop section: comprise raffinate deironing, the heavy zinc of raffinate and the molten operation of raffinate acid;
E1, raffinate iron removal step: at first the raffinate that obtains in the Centrifugical extraction operation is added in the iron removal trough, slowly add neutralizing agent calcium hydroxide in the groove again or lime carbonate carries out the neutralizing hydrolysis deironing, till pH value=4.8～5.4 in neutralizing hydrolysis deironing ore pulp.Output deironing ore pulp send dense groove to sink clearly; The deironing supernatant liquor of output send deironing supernatant liquor storage tank, send heavy zinc operation again, and the deironing underflow send press filtration, and the scum of output send to be stored up or produces iron oxide red and gypsum sale.
Principal reaction formula: Fe
2(SO
4)
3+ 3Ca (OH)
2+ 6H
2O=2Fe (OH)
3↓+3CaSO
4.2H
2O.
Raffinate iron removal step technology condition is as follows: reaction beginning acid: 9～50g/L, temperature of reaction: 5～40 ℃, the reaction times: 30～60 minutes, reaction is acid eventually: PH=4.8～5.4, solid-to-liquid ratio were controlled between 1: 6～8.
The heavy zinc operation of E2, raffinate: at first the deironing supernatant liquor is added in the heavy zinc groove, slowly add neutralizing agent calcium hydroxide in the groove again or lime carbonate carries out the heavy zinc of neutralizing hydrolysis, till pH value=6.5～9 that sink to neutralizing hydrolysis in the zinc supernatant liquor.The heavy zinc ore slurry of output send dense groove heavy clear, and liquid was used before the heavy zinc supernatant liquor of the neutralizing hydrolysis of output sent the heavy zinc supernatant storage tank of neutralizing hydrolysis to return acidleach operation complex acid to soak; It is that zinc hydroxide send sour molten operation that heavy zinc underflow send the heavy cadmia of press filtration output.
Principal reaction formula: Zn (SO)
4+ Ca (OH)
2+ 2H
2O=Zn (OH)
2+ CaSO
4.2H
2O.
The heavy zinc procedure technology technical qualification of raffinate are as follows: the acid of reaction beginning: PH=4.8～5.4, temperature of reaction: 5～40 ℃, the reaction times: 30～60 minutes, reaction is acid eventually: PH=6.5～9, solid-to-liquid ratio were controlled between 1: 6～8.
The molten operation of E3, raffinate acid: at first molten zinc operation secondary slag washing water, waste electrolyte, sulfuric acid are added in proportion prepare in the sour fluid bowl acid molten before liquid, zinc hydroxide is slowly added till the molten ore pulp PH=4.8 of acid～5.4, the sour molten ore pulp of output send dense groove heavy clear again; The sour molten supernatant liquor of output send sour molten supernatant liquor storage tank to send cleaning section again; The sour molten underflow of output send press filtration, and the pressing filtering liquid of output send sour molten supernatant liquor storage tank, and the sour molten slag of output adds the water washing press filtration, and the sour molten slag (calcium sulfate) that obtains is stored up Huo Pins and sold, the secondary slag washing water that obtains return sour molten operation complex acid molten before liquid use.
Principal reaction formula: Zn (OH)
2+ H
2SO
4=ZnSO
4+ 2H
2O.
The molten procedure technology technical qualification of raffinate acid are as follows: reaction beginning acid: 120～150g/L, temperature of reaction: 5～40 ℃, the reaction times: 30～60 minutes, reaction is acid eventually: PH=4.8～5.4, solid-to-liquid ratio were controlled between 1: 6～8.
Embodiment four:
A kind of neutralizing hydrolysis removes iron processes zinc metallurgy (containing extraction of indium) technology (referring to Fig. 2), adopts Zinc hydrometallurgy process, comprises following operation:
A, leaching section: its concrete operations step and technology condition are identical with embodiment one;
B, neutralizing hydrolysis operation: its concrete operations step is identical with embodiment three, and difference is:
Neutralizing hydrolysis procedure technology technical qualification are as follows: reaction beginning acid: 20～50g/L, and temperature of reaction: 60～90 ℃, the reaction times: 60～90 minutes, reaction is acid eventually: PH=5.3～5.4, between the solid-to-liquid ratio 1: 6～8.
C, acidleach operation: its concrete operations step is identical with embodiment three, and difference is:
Technology condition is as follows: reaction beginning acid: 80～130g/L, and temperature of reaction: 40～90 ℃, the reaction times: 60～90 minutes, reaction is acid eventually: 30～50g/L, solid-to-liquid ratio is controlled between 1: 6～8,
D, pickling process: its concrete operations step and technology condition are identical with embodiment three;
E, raffinate reclaim zinc workshop section: its concrete operations step and technology condition are identical with embodiment three.
The embodiment of the invention three carries the Centrifugical extraction of indium system, anti-indium, displacement, indium electrodeposition, founding operation and the anti-iron of organic phase regenerated with embodiment four described Centrifugical extractions, it is identical to wash the technology that chlorine operation and existing traditional Centrifugical extraction put forward the indium system.As:
Centrifugical extraction operation principal reaction formula: In
3+ (water)+ 3 (HA)
2 (having)=In (HA
2)
3 (having)+ 3H
+ (water)With
Fe
3+ (water)+ 3 (HA)
2 (having)=Fe (HA
2)
3 (having)+ 3H
+ (water)
Centrifugal extracting process technical qualification: organic phase proportioning: 30%P204+ kerosene; Extraction progression: 2 grades; Compare: organic phase/water=1/14～15;
Other anti-indiums, displacement, indium electrodeposition, founding operation and the anti-iron of organic phase regenerated, the technology condition of washing the chlorine operation repeat no more herein.
What the concentration of acid of the present invention was not refered in particular to all is with sulphur acid meter.
Adopt zinc metallurgy of the present invention and carry indium and all can satisfy following technical indicator:
Zinc soaks rate＞98%, zinc total yield＞93%, and indium leaching yield 90～93%, indium recovery＞80%, the pickling slag contains indium 0.008%～0.009%, and raffinate contains indium＜6mg/L, indium percentage extraction＞94%,
Neutralizing hydrolysis deironing and iron indium slag acidleach proof test result are as follows:
1, removes neutralizing hydrolysis supernatant liquor composition that low acidleach that iron tests uses goes out supernatant liquor composition and output (referring to subordinate list one) as can be seen from following neutralizing hydrolysis: by the control neutralizing hydrolysis operation reaction pH value of acid eventually, (1) iron concentration in the neutralizing hydrolysis supernatant liquor can drop to 0.0055g/L from 23.24g/L, reach the requirement of deironing fully, (2) the indium ion concentration in the neutralizing hydrolysis supernatant liquor can drop to 2.25mg/L from 98.54mg/L, reaches the purpose of heavy indium fully.
2, from the acidleach supernatant liquor of following iron indium slag leaching test output and pickling slag testing data (referring to subordinate list two) as can be seen: (1) iron indium slag is behind acidleach, pickling process, the pickling slag of output contains that zinc drops to 0.40～0.43%, iron content drops to 0.21～0.34%, contain indium drops to 0.009～0.012%, reaches the purpose that reclaims indium zinc fully; (2) its iron indium slag is behind acidleach, pickling process, and the indium ion concentration of output acidleach supernatant liquor fully meets Centrifugical extraction indium-extracting process requirement at 26.53～37.34g/L, iron concentration at 17.09～24.90g/L at 71～85mg/L, zinc ion concentration.
Subordinate list one: neutralizing hydrolysis deironing experiment information slip
Subordinate list two: the acidleach of iron indium slag, acid washing test information slip
Claims (4)
1, a kind of neutralizing hydrolysis removes the iron processes smelting process, adopts Zinc hydrometallurgy process, it is characterized in that: comprise following operation:
A, leaching section: described leaching section comprises that low acidleach goes out operation and peracid leaches operation, soon zinc baking sand flue dust, Manganse Dioxide and electrolysis waste solution, peracid leach supernatant liquor, the low acidleach of the direct adding of sulfuric acid goes out operation, the low acidleach of output goes out supernatant liquor and sends into the neutralizing hydrolysis operation, and the low acidleach of output goes out underflow and waste electrolyte, sulfuric acid add peracid leaching operation; The peracid leaching supernatant liquor of output returns low acidleach and goes out operation; The peracid of output leaches the underflow press filtration, and the filtrate of output is returned low acidleach and gone out operation, and the peracid leached mud of output is stored up or sent back to and receive tin, lead, silver;
It is as follows that low acidleach goes out the operation technology condition: reaction beginning acid: 120～150g/L, and the reaction times: 55～65 minutes, temperature of reaction: 65～75 ℃, reaction is acid eventually: 5～20g/L, solid-to-liquid ratio is 1: 8～12;
It is as follows that peracid leaches the procedure technology technical qualification: reaction beginning acid: 150～160g/L, and the reaction times: 2～3 hours, temperature of reaction: 90～95 ℃, reaction is acid eventually: 50～60g/L, solid-to-liquid ratio is 1: 6～8;
B, neutralizing hydrolysis operation: low acidleach goes out supernatant liquor and sends into the neutralizing hydrolysis operation, adds neutralizing agent calcium hydroxide or lime carbonate and carries out the neutralizing hydrolysis deironing, and the neutralizing hydrolysis supernatant liquor of output is sent into purification, the electrodeposition operation is extracted zinc; When the neutralizing hydrolysis scum that obtains is stored up when not containing the indium scum, when the neutralizing hydrolysis scum that obtains when containing the indium scum, send the acidleach operation, the acidleach supernatant liquor of output send and passes Centrifugical extraction and put forward the indium system and carry indium;
Neutralizing hydrolysis procedure technology technical qualification are: reaction beginning acid: 5～50g/L, temperature of reaction: 5～90 ℃, the reaction times: 30～90 minutes, reaction is acid eventually: PH=4.8～5.4, solid-to-liquid ratio: 1: 6～8.
2, a kind of neutralizing hydrolysis according to claim 1 removes the iron processes smelting process, it is characterized in that: the neutralizing hydrolysis scum that obtains in the described neutralizing hydrolysis operation is for containing the indium scum, iron indium slag send acidleach operation adding sulfuric acid to carry out acidleach, and the acidleach supernatant liquor send traditional Centrifugical extraction to put forward the indium system and extracts indium; The raffinate that obtains in the Centrifugical extraction operation is sent into the zinc recycle section and is reclaimed zinc;
The technical qualification of described acidleach operation are: reaction beginning acid: 60～130g/L, and temperature of reaction: 5～90 ℃, the reaction times: 30～90 minutes, reaction is acid eventually: 9～50g/L, solid-to-liquid ratio: 1: 6～8;
Described centrifugal extracting process technical qualification: organic phase proportioning: 30%P204+ kerosene; Extraction progression: 2 grades; Compare: organic phase/water=1/14～15.
3, a kind of neutralizing hydrolysis according to claim 2 removes the iron processes smelting process, it is characterized in that: the acidleach underflow of acidleach operation output send pickling process to add sulfuric acid and slag washing water carries out pickling, liquid was used before the pickling supernatant liquor of output sent acidleach operation complex acid to soak, the pickling slag calcium sulfate of output is stored up or is sold
The technical qualification of described pickling process are: solid-to-liquid ratio: 1: 6～8, and reaction beginning acid: 10～15g/L, temperature of reaction: 5～40 ℃, the reaction times: 30～60 minutes, reaction is acid eventually: 5～8g/L.
4, remove the iron processes smelting process according to claim 2 or 3 described a kind of neutralizing hydrolysis, it is characterized in that: the raffinate that obtains in the Centrifugical extraction operation is sent into the zinc recycle section and is reclaimed zinc, raffinate zinc recycle section comprises the raffinate iron removal step, raffinate sinks the zinc operation, the molten operation of raffinate acid, being about to raffinate send iron removal step adding neutralizing agent calcium hydroxide or lime carbonate to carry out the neutralizing hydrolysis deironing, the deironing supernatant liquor of output send heavy zinc operation to add neutralizing agent calcium hydroxide or lime carbonate carries out the heavy zinc of neutralizing hydrolysis, the heavy zinc underflow that the heavy zinc of neutralizing hydrolysis is obtained send sour molten operation to add slag washing water at last, electrolysis waste solution, it is molten that sulfuric acid carries out acid, and the sour molten supernatant liquor that obtains send cleaning section;
Raffinate iron removal step technology condition is: reaction beginning acid: 9～50g/L, and temperature of reaction: 5～40 ℃, the reaction times: 30～60 minutes, reaction is acid eventually: PH=4.8～5.4, solid-to-liquid ratio were controlled between 1: 6～8;
The heavy zinc procedure technology technical qualification of raffinate are: the acid of reaction beginning: PH=4.8～5.4, and temperature of reaction: 5～40 ℃, the reaction times: 30～60 minutes, reaction is acid eventually: PH=6.5～9, solid-to-liquid ratio were controlled between 1: 6～8;
The molten procedure technology technical qualification of raffinate acid are: reaction beginning acid: 120～150g/L, temperature of reaction: 5～40 ℃, the reaction times: 30～60 minutes, reaction is acid eventually: PH=4.8～5.4, solid-to-liquid ratio were controlled between 1: 6～8.
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