CN104862489A - Method of recycling gold, silver, zinc and lead from zinc leaching residues - Google Patents
Method of recycling gold, silver, zinc and lead from zinc leaching residues Download PDFInfo
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- CN104862489A CN104862489A CN201510196096.8A CN201510196096A CN104862489A CN 104862489 A CN104862489 A CN 104862489A CN 201510196096 A CN201510196096 A CN 201510196096A CN 104862489 A CN104862489 A CN 104862489A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
A method of recycling gold, silver, zinc and lead from zinc leaching residues belongs to the technical field of metallurgy. Precious metal such as gold and silver are recycled from acid leaching residues of zinc by adopting strong base preimpregnation and cyanide leaching; water is added into the acid leaching residues of zinc to carry out slurry mixing and washing; sodium hydroxide is added into the mixed slurry after filtration for preimpregnation; after preimpregnation ends, filtration is carried out; lead and zinc in filter liquor are recycled by two-stage sulfide precipitation of the filter liquor; the gold and the silver in a filter cake are recycled by cyanide leaching after the filter cake is subjected to slurry mixing, and thus the comprehensive utilization of mineral resources is realized. After the technical scheme is adopted, the recovery rates of the gold and the silver can reach over 85%; the recovery rates of the lead and the zinc can reach over 50%; the selling price of lead concentrate and zinc concentrate is 10000 yuan/ton; the gold price is about 200 yuan/gram; and the silver price is about 4 yuan/gram. The output of each ton is greater than 1200 yuan, the production cost is about 600 yuan/ton after the technical scheme is adopted, and the profit of each ton is greater than 600 yuan; a plant which adopts zinc concentrate pickling roasting-acid leaching technology at present discharges about 5 million tons of slags each year, and if the plant adopts the invention, about 3 billion yuan of income can be increased each year.
Description
Technical field
The invention belongs to metallurgical technology field, be specifically related to a kind of method reclaiming gold and silver, zinc and lead from zinc leaching slag.
Background technology
More than 85% is accounted for hydrometallurgy in our times zinc output, certainly lead to a large amount of hydrometallurgy zinc leaching slags thus, in practice, often produce l ton electrolytic zinc and want output 1.0-1.05 ton zinc metallurgy slag, the annual output electrolytic zinc in the whole nation is more than 500 tons, generation is more than 5,000,000 tons of acid cadmias, and the speed increased year by year.If these zinc leaching slag can not get effective process, not only cause the very large wasting of resources, and environment also can be subject to serious pollution.In Zinc Hydrometallurgy Process, the silver in zinc ore concentrate is almost all enriched in acid leaching residue.The acid leaching residue that the annual output of zinc hydrometallurgy factory of China is a large amount of, silver content is 100 ~ 600g/t about, simultaneously also containing zinc about 10% and other valuable element a small amount of.Wherein, silver-colored existing forms is complicated, reclaims difficulty.Along with the continuous growth of silver-colored consumption and the day by day deficient of resource, the price of silver is day by day soaring, and the Research Significance of carrying out recover silver from the zinc hydrometallurgy high acidic oils slag of argentiferous is great.
From high acidic oils slag, the method for recover silver mainly contains flotation process, alkali fusion, By Thiourea-uv Method, villaumite method and acidizing fired-villaumite leaching etc.In production practice, the rate of recovery of silver is mostly lower than 60%, there is the problems such as reagent consumption is large, cost is high, energy consumption is large, contaminate environment simultaneously.
Summary of the invention
The object of the present invention is to provide a kind of method reclaiming gold and silver, zinc and lead from zinc leaching slag.
Based on above-mentioned purpose, the present invention takes following technical scheme:
A kind of method reclaiming gold and silver, zinc and lead from zinc leaching slag, comprise the steps: that zinc is soaked slag and adds water that to be made into solid-liquid mass ratio be 1:(1 ~ 10 by (1)) ore pulp 1, stir 0.5 ~ 10 hour, solid-liquid separation, liquid adds sodium sulphite and sinks zinc, obtains zinc ore concentrate after filtration; (2) being made into solid-liquid mass ratio by the solid of solid-liquid separation gained and leach liquor is 1:(1 ~ 10) ore pulp 2, at the temperature of 15 ~ 100 DEG C, leach 0.5 ~ 20h; First time filters, and it is heavy plumbous to add sodium sulphite in the filtrate after filtering to first time, and the solid that second time obtains after filtering is lead ore concentrate, second time filter after filtrate add Sulfothiorine again and sink zinc, the solid that third time filters gained is zinc ore concentrate; (3) first time filters the filter cake of rear gained, adds water and sizes mixing, make solid-liquid mass ratio be 1:(1 ~ 5), add NaCN in ore pulp, make NaCN quality concentration be 0.01 ~ 10g/L, extraction time 4 ~ 60 hours; Leaching washes with water after terminating, and filters for the 4th time, and the liquid that the 4th filtration obtains is through zinc dust precipitation, and filtering gained solid through the 5th time is containing golden silver-colored mud.
Described step (1) and the middle amount of sodium sulfide of step (2) are 0.1 ~ 100kg/m
3.
In described step (2), leach liquor is 10 ~ 500g/LNaOH and 1 ~ 500g/L Na
2sO
4the aqueous solution.
In described step (2), Sulfothiorine consumption is 0.1 ~ 500kg/m
3.
In described step (3), zinc powder consumption is 0.01 ~ 10kg/m
3.
Employing the present invention reclaims the golden Ag-pb-zn in zinc acid leaching residue, recovery of gold and silver more than 85%, the rate of recovery of plumbous zinc can reach more than 50%, lead ore concentrate and zinc ore concentrate price are at 10000 yuan/ton, price of gold is about 200 yuan/gram, and silver-colored valency is about 4 yuan/gram, and output per ton is greater than 1200 yuan, adopt this programme production cost to be about 600 yuan/ton, profit per ton is greater than 600 yuan.Present employing zinc ore concentrate is acidizing fired---and the producer of acid leaching process discharges slag about 5,000,000 tons every year, then can increase income about 3,000,000,000 yuan every year according to the present invention.
Accompanying drawing explanation
Fig. 1 is process flow sheet of the present invention.
Embodiment
Below in conjunction with specific embodiment, technical scheme of the present invention is described in further detail, but protection scope of the present invention is not limited thereto.
Example 1
Process somewhere, Inner Mongol high acidic oils zinc leaching slag 30t, its chemical composition sees the following form:
Utilize method of the present invention to process, as shown in Figure 1, concrete steps are as follows:
1, raw material washing
First added water by raw material and be made into the ore pulp that solid-to-liquid ratio is 1:10, stir after 0.5 hour, ore pulp is pumped into pressure filter and carry out solid-liquid separation, solid enters step 2 and carries out preimpregnation operation, and liquid adds sodium sulphite and sinks zinc, and amount of sodium sulfide is 5kg/m
3, after filtration, obtain zinc ore concentrate; Containing zinc 62wt%, gross dry weight 870kg, zinc recovery 32%;
2, preimpregnation
(leach liquor is 500g/LNaOH and 20g/LNa to be made into by the solid of step 1 solid-liquid separation gained and leach liquor the ore pulp that solid-to-liquid ratio is 1:5
2sO
4the aqueous solution), 55 DEG C leach 2h; Leach through the liquid that first time filtration ore pulp obtains after terminating, first add the heavy lead of sodium sulphite, amount of sodium sulfide is 1kg/m
3, second time filter after the solid that obtains be lead ore concentrate, the filtrate that second time is filtered adds Sulfothiorine again and sinks zinc, and Sulfothiorine consumption is 2kg/m
3, third time filters, and the solid that third time filters gained is zinc ore concentrate, and filtrate adds NaOH, can be used as the leach liquor of this step after making its concentration reach 500g/L, common property goes out lead ore concentrate 435kg, leaded 58wt%, lead recovery 60%, output zinc ore concentrate 820kg, containing zinc 52wt%, zinc total yield 58.3%;
3, cyanidation gold-extracted silver
The filter cake of first time filtration gained, add water and size mixing, solid-liquid mass ratio 1:2.5, adds NaCN in ore pulp, makes NaCN quality concentration be 0.2g/L, extraction time 24 hours; Filter through washing and the 4th time after leaching terminates, the 4th liquid that obtains of filtration through zinc dust precipitation, zinc powder consumption 3kg/m
3, filtering gained solid through the 5th time is containing golden silver-colored mud, and sell through smelting into gold containing material, the liquid filtered for the 5th time is lean solution, returns this step and replaces water to size mixing.Be total to obtain gold containing material 14.18kg, argentiferous 35%, containing gold 0.17%, gold recovery 95%, silver raising recovery rate 92%.
Example 2
Process somewhere, Yunnan high acidic oils zinc leaching slag 10t, its chemical composition sees the following form:
Utilize method of the present invention to process, as shown in Figure 1, concrete steps are as follows:
1, raw material washing
First added water by raw material and be made into the ore pulp that solid-to-liquid ratio is 1:5, stir after 5 hours, ore pulp is pumped into pressure filter and carry out solid-liquid separation, solid enters step 2 and carries out preimpregnation operation, and liquid adds sodium sulphite and sinks zinc, and amount of sodium sulfide is 10kg/m
3, after filtration, obtain zinc ore concentrate; Containing zinc 61%, gross dry weight 275.9kg, zinc recovery 28%;
2, preimpregnation
(leach liquor is for adding 200g/LNaOH and 5g/LNa to be made into by the solid of step 1 solid-liquid separation gained and leach liquor the ore pulp that solid-to-liquid ratio is 1:3
2sO
4the aqueous solution), 80 DEG C leach 4h; Leach through the liquid that first time filtration ore pulp obtains after terminating, first add the heavy lead of sodium sulphite, amount of sodium sulfide is 2kg/m
3, second time filter after the solid that obtains be lead ore concentrate, the filtrate that second time is filtered adds Sulfothiorine again and sinks zinc, and Sulfothiorine consumption is 8kg/m
3, filter through third time, the solid that third time filters gained is zinc ore concentrate, and the filtrate that third time filters adds NaOH, can be used as the leach liquor of this step after making its concentration reach 400g/L.Common property goes out lead ore concentrate 263.4kg, leaded 58wt%, lead recovery 67%; Output zinc ore concentrate 393.4kg, containing zinc 55wt%, zinc total yield 64%;
3, cyanidation gold-extracted silver
The filter cake of first time filtration gained, add water and size mixing, solid-liquid mass ratio 1:1.5, adds NaCN in ore pulp, ensures that NaCN quality concentration is 2g/L, extraction time 48 hours; Filter through washing and the 4th time after leaching terminates, the 4th liquid that obtains of filtration after zinc dust precipitation, zinc powder consumption 5kg/m
3, filter through the 5th time, gained solid is the silver-colored mud containing gold, and sell through smelting into gold containing material, the liquid filtered for the 5th time is lean solution, returns this step and replaces water to size mixing.Be total to obtain gold containing material 8.9kg, argentiferous 35wt%, containing golden 0.18wt%, gold recovery 94%, silver raising recovery rate 93%.
Example 3
Process Shaanxi factory presses hot Leaching Zinc to soak slag 100kg, and its chemical composition sees the following form:
Utilize method of the present invention to process, concrete steps are as follows:
1, raw material washing
First added water by raw material and be made into the ore pulp that solid-to-liquid ratio is 1:1, stir after 8 hours, ore pulp is pumped into pressure filter and carry out solid-liquid separation, solid enters step 2 and carries out preimpregnation operation, and liquid adds sodium sulphite and sinks zinc, and amount of sodium sulfide is 20kg/m
3, after filtration, obtain zinc ore concentrate; Containing zinc 64wt%, gross dry weight 3.6kg, zinc recovery 32%;
2, preimpregnation
(leach liquor is 400g/LNaOH and 10g/LNa to be made into by the solid of step 1 solid-liquid separation gained and leach liquor the ore pulp that solid-to-liquid ratio is 1:7
2sO
4the aqueous solution), at the temperature of 70 DEG C, leach 8h; Leach through the liquid that first time filtration ore pulp obtains after terminating, first add the heavy lead of sodium sulphite, amount of sodium sulfide is 10kg/m
3, second time filter after the solid that obtains be lead ore concentrate, the filtrate that second time is filtered adds Sulfothiorine again and sinks zinc, and Sulfothiorine consumption is 20kg/m
3, filter through third time, the solid that third time filters gained is zinc ore concentrate, and filtrate adds NaOH, can be used as the leach liquor of this step after making its concentration reach 400g/L.Common property goes out lead ore concentrate 4.0kg, leaded 45wt%, lead recovery 47%; Output zinc ore concentrate 4.6kg, containing zinc 57wt%, zinc total yield 36%;
3, cyanidation gold-extracted silver
The filter cake of first time filtration gained, productive rate 71%, containing golden 3.38g/t, argentiferous 720.2g/t, adds water and sizes mixing, and solid-liquid mass ratio 1:2, adds NaCN in ore pulp, makes NaCN quality concentration be 10g/L, extraction time 72 hours; Through washing and filtration after leaching terminates, gained solid is leaching slag, and through chemical examination, leaching slag contains golden 0.24g/t, argentiferous 34.55g/t, gold leaching rate 92.9%, silver leaching rate 95.2%.Gold and silver in liquid reclaims by zinc dust precipitation, because of comparatively small amt, does not give and carries out displacement operation.
Claims (5)
1. from zinc leaching slag, reclaim a method for gold and silver, zinc and lead, it is characterized in that, comprise the steps:
(1) zinc is soaked slag and adds water that to be made into solid-liquid mass ratio be 1:(1 ~ 10) ore pulp 1, stir 0.5 ~ 10 hour, solid-liquid separation, liquid adds sodium sulphite and sinks zinc, obtains zinc ore concentrate after filtration;
(2) solid of solid-liquid separation gained and leach liquor are made into solid-liquid mass ratio is 1:(1 ~ 10) ore pulp 2, at the temperature of 15 ~ 100 DEG C, leach 0.5 ~ 20h; First time filters, and it is heavy plumbous to add sodium sulphite in the filtrate after filtering to first time, and the solid that second time obtains after filtering is lead ore concentrate, second time filter after filtrate add Sulfothiorine again and sink zinc, the solid that third time filters gained is zinc ore concentrate;
(3) after filtering to first time gained filter cake in add water and size mixing, make solid-liquid mass ratio be 1:(1 ~ 5), add NaCN in ore pulp, make NaCN quality concentration be 0.01 ~ 10g/L, extraction time 4 ~ 60 hours; Leaching washes with water after terminating, and filters for the 4th time, filters the liquid zinc dust precipitation obtained the 4th time, and filtering gained solid through the 5th time is containing golden silver-colored mud.
2. the method reclaiming gold and silver, zinc and lead from zinc leaching slag according to claim 1, is characterized in that, described step (1) and the middle amount of sodium sulfide of step (2) are 0.1 ~ 100kg/m
3.
3. the method reclaiming gold and silver, zinc and lead from zinc leaching slag according to claim 1, it is characterized in that, in described step (2), leach liquor is 10 ~ 500g/LNaOH and 1 ~ 500g/L Na
2sO
4the aqueous solution.
4. the method reclaiming gold and silver, zinc and lead from zinc leaching slag according to claim 1, it is characterized in that, in described step (2), Sulfothiorine consumption is 0.1 ~ 500kg/m
3.
5. the method reclaiming gold and silver, zinc and lead from zinc leaching slag according to claim 1, it is characterized in that, in described step (3), zinc powder consumption is 0.01 ~ 10kg/m
3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510196096.8A CN104862489A (en) | 2015-04-23 | 2015-04-23 | Method of recycling gold, silver, zinc and lead from zinc leaching residues |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510196096.8A CN104862489A (en) | 2015-04-23 | 2015-04-23 | Method of recycling gold, silver, zinc and lead from zinc leaching residues |
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| CN104862489A true CN104862489A (en) | 2015-08-26 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105177301A (en) * | 2015-08-28 | 2015-12-23 | 商洛学院 | Technology for recycling and refining furnace clinker of lead and zinc metallurgical furnace |
| CN106399707A (en) * | 2016-11-07 | 2017-02-15 | 南昌专腾科技有限公司 | Comprehensive recovery method and system for zinc and silver in zinc smelting waste slag |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1858275A (en) * | 2006-06-07 | 2006-11-08 | 同济大学 | Mehtod for producing zinc concentrate and lead concentrate using zinc oxide ore and zinc slag |
| CN102719668A (en) * | 2012-07-09 | 2012-10-10 | 山东理工大学 | Technology for extracting zinc, lead and silver step by step by processing zinc-leached residues by full wet process |
-
2015
- 2015-04-23 CN CN201510196096.8A patent/CN104862489A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1858275A (en) * | 2006-06-07 | 2006-11-08 | 同济大学 | Mehtod for producing zinc concentrate and lead concentrate using zinc oxide ore and zinc slag |
| CN102719668A (en) * | 2012-07-09 | 2012-10-10 | 山东理工大学 | Technology for extracting zinc, lead and silver step by step by processing zinc-leached residues by full wet process |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105177301A (en) * | 2015-08-28 | 2015-12-23 | 商洛学院 | Technology for recycling and refining furnace clinker of lead and zinc metallurgical furnace |
| CN106399707A (en) * | 2016-11-07 | 2017-02-15 | 南昌专腾科技有限公司 | Comprehensive recovery method and system for zinc and silver in zinc smelting waste slag |
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Application publication date: 20150826 |
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