CN116692928A - Process for producing active zinc oxide by using zinc waste - Google Patents
Process for producing active zinc oxide by using zinc waste Download PDFInfo
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- CN116692928A CN116692928A CN202310565334.2A CN202310565334A CN116692928A CN 116692928 A CN116692928 A CN 116692928A CN 202310565334 A CN202310565334 A CN 202310565334A CN 116692928 A CN116692928 A CN 116692928A
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- zinc
- leaching
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- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 title claims abstract description 93
- 239000011701 zinc Substances 0.000 title claims abstract description 91
- 229910052725 zinc Inorganic materials 0.000 title claims abstract description 88
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 title claims abstract description 54
- 239000002699 waste material Substances 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 35
- 239000011787 zinc oxide Substances 0.000 title claims abstract description 27
- 238000000746 purification Methods 0.000 claims abstract description 35
- 238000001556 precipitation Methods 0.000 claims abstract description 33
- 238000002386 leaching Methods 0.000 claims abstract description 32
- 238000001035 drying Methods 0.000 claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 9
- 239000012535 impurity Substances 0.000 claims abstract description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 36
- 238000006243 chemical reaction Methods 0.000 claims description 28
- 239000000706 filtrate Substances 0.000 claims description 24
- 229910052742 iron Inorganic materials 0.000 claims description 17
- 239000007787 solid Substances 0.000 claims description 16
- 239000000047 product Substances 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 13
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 13
- 229910052802 copper Inorganic materials 0.000 claims description 13
- 239000010949 copper Substances 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 13
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 claims description 12
- 239000002244 precipitate Substances 0.000 claims description 12
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 10
- 229910052793 cadmium Inorganic materials 0.000 claims description 9
- UOURRHZRLGCVDA-UHFFFAOYSA-D pentazinc;dicarbonate;hexahydroxide Chemical compound [OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[Zn+2].[Zn+2].[Zn+2].[Zn+2].[Zn+2].[O-]C([O-])=O.[O-]C([O-])=O UOURRHZRLGCVDA-UHFFFAOYSA-D 0.000 claims description 9
- 239000000460 chlorine Substances 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims description 6
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical group [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 5
- 239000012065 filter cake Substances 0.000 claims description 5
- 150000002500 ions Chemical class 0.000 claims description 5
- 229910052935 jarosite Inorganic materials 0.000 claims description 5
- 239000012286 potassium permanganate Substances 0.000 claims description 5
- 239000002893 slag Substances 0.000 claims description 5
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 5
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 5
- 235000011152 sodium sulphate Nutrition 0.000 claims description 5
- 239000011572 manganese Substances 0.000 claims description 4
- 238000012216 screening Methods 0.000 claims description 4
- 238000005406 washing Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 2
- 229910052801 chlorine Inorganic materials 0.000 claims description 2
- 229910052748 manganese Inorganic materials 0.000 claims description 2
- 230000001376 precipitating effect Effects 0.000 claims description 2
- 238000010298 pulverizing process Methods 0.000 claims description 2
- 238000007873 sieving Methods 0.000 claims description 2
- 150000003752 zinc compounds Chemical class 0.000 claims description 2
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 claims description 2
- 229960001763 zinc sulfate Drugs 0.000 claims description 2
- 229910000368 zinc sulfate Inorganic materials 0.000 claims description 2
- 238000004821 distillation Methods 0.000 abstract description 5
- 238000003723 Smelting Methods 0.000 abstract description 4
- 238000003912 environmental pollution Methods 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000035484 reaction time Effects 0.000 description 5
- 238000001914 filtration Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000003825 pressing Methods 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 238000004537 pulping Methods 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000001502 supplementing effect Effects 0.000 description 3
- 230000000382 dechlorinating effect Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 239000013064 chemical raw material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000003500 flue dust Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G9/00—Compounds of zinc
- C01G9/02—Oxides; Hydroxides
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a process for producing active zinc oxide by using zinc waste, which belongs to the technical field of zinc smelting and comprises the following steps: s1, leaching zinc-containing waste: s2, purifying: s3, zinc precipitation: s4, drying and baking, which has the beneficial effects that: the method for producing active zinc oxide by utilizing zinc waste material has high purification degree and less impurity content, and the zinc waste material is used as raw material to recover the zinc waste material, so that the economic benefit is improved, the environmental pollution is reduced, and the original distillation method is replaced.
Description
Technical Field
The invention belongs to the technical field of zinc smelting, and particularly relates to a process for producing active zinc oxide by using zinc waste.
Background
In the consumption structure of zinc, except that some advanced zinc chemical products are produced by taking grade zinc as a raw material, most zinc chemical products can be produced by adopting a hydrometallurgical method by using zinc waste; the zinc oxide white powder is widely applied to the production fields of rubber, paint, plastic, paper making, fluorescent powder, smoke and fire, smoke and curtain bullet and the like, has huge consumption, has wide application fields when being used as basic metallurgy and chemical raw materials, has characteristic functions and is developed to be applied to new scientific fields and new industries, and becomes an important basic chemical raw material and new material which are indispensable in national economy construction.
In the production process of metallurgical industry in China, zinc wastes are generated from tank slag of horizontal tank zinc smelting, crude zinc oxide dust of copper smelting, flue dust and the like, the zinc content of the wastes is low, the components are complex, and the direct adoption of a reduction distillation method for producing grade zinc oxide is difficult, so that the recovery of the zinc wastes has important significance for improving economic benefit and reducing environmental pollution.
Disclosure of Invention
The invention aims to solve the technical problem that the existing zinc waste is difficult to produce grade zinc by directly adopting a reduction distillation method.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a process for producing active zinc oxide from zinc waste, comprising the steps of:
s1, leaching zinc-containing waste: leaching the zinc-containing waste material with industrial sulfuric acid to dissolve zinc compounds in the zinc-containing material into zinc sulfate, and forming residues from insoluble solids; the mixed ore pulp obtained in the leaching production process is subjected to liquid-solid separation, impurities such as Fe, mn, cu, cd and the like are removed from the zinc solution after the liquid-solid separation through two-stage purification, a solution with high zinc content and residues with low zinc content are formed, filter residues are piled up, and the filtrate is subjected to subsequent purification treatment; the main reaction is as follows:
ZnO+H 2 SO 4 ＝ZnSO 4 +H 2 O
PbO+H 2 SO 4 ＝PbSO 4 ↓+H 2 O
CdO+H 2 SO 4 ＝CdSO 4 +H 2 O
CuO+H 2 SO 4 ＝CdSO 4 +H 2 O
FeO+H 2 SO 4 ＝FeSO 4 +H 2 O
s2, purifying: adding potassium permanganate into the filtrate after liquid-solid separation for primary purification, removing iron and manganese in the filtrate, and primarily purifying filter residues into iron slag; the primary purification is carried out on the liquid, the zinc powder is added to replace copper and cadmium in the leaching liquid, the copper and cadmium in the leaching liquid are removed, the secondary purification filter residue is copper and cadmium slag, and the secondary liquid is subjected to the subsequent zinc precipitation process; the main reactions are as follows:
2KMnO 4 +3MnSO 4 +2H 2 O＝K 2 SO 4 +5MnO 2 ↓+2H 2 SO 4
5Fe 2+ +MnO 4 - +8H + ＝5Fe 3+ +Mn 2+ +4H 2 O
Fe 2 (SO 4 ) 3 +6H 2 O＝2Fe(OH) 3 ↓+3H 2 SO 4
s3, zinc precipitation: adding sodium carbonate into the solution after secondary purification to carry out zinc precipitation reaction, generating a precipitation product basic zinc carbonate, and repeatedly washing filter residues with production water to remove Cl - After the ions are separated from liquid and solid, the main component of the filtrate is sodium sulfate used as a jarosite iron precipitation neutralizer in the leaching process, and the filter cake is subjected to the subsequent drying and baking process; the main reactions are as follows:
3ZnSO 4 +3Na 2 CO 3 +H 2 O＝ZnCO 3 ·2Zn(OH) 2 ↓+3Na 2 SO 4 +2CO 2 ↑
s4, drying and baking: removing chlorine from the precipitate after zinc precipitation, drying at 100deg.C, drying water in the precipitate, baking at 400-500deg.C for 5-7 hr, pulverizing, and sieving to obtain active zinc oxide product; the main reactions are as follows:
ZnCO 3 ·2Zn(OH) 2 ＝3ZnO+CO 2 ↑+2H 2 O↑。
the method comprises the steps of leaching zinc-containing waste, purifying, removing impurities, precipitating zinc, drying, baking and the like, so as to purify zinc in the zinc-containing waste; the purified basic zinc carbonate precipitate is used as a raw material to prepare a basic zinc carbonate raw material by adopting a drying and baking method, and the active zinc oxide product is obtained through the procedures of crushing, screening and the like.
Compared with the prior art, the invention has the following beneficial effects:
the method for producing active zinc oxide by utilizing zinc waste material has high purification degree and less impurity content, and the zinc waste material is used as raw material to recover the zinc waste material, so that the economic benefit is improved, the environmental pollution is reduced, and the original distillation method is replaced.
Drawings
FIG. 1 is a schematic process flow diagram of an embodiment of the present invention.
Detailed Description
The present invention will now be described in detail with reference to the drawings and the specific embodiments thereof, wherein the illustrative embodiments and descriptions of the invention are for illustration, but not for limitation.
Example 1
As shown in fig. 1, the process for producing active zinc oxide by using zinc waste material comprises the following main components: znO:90%, fe:5%, cu, cd:1.5%.
Step (1): leaching of zinc-containing waste: 1000g of zinc-containing waste was fed to 40m of zinc waste 3 Pulping and leaching the mixture in a leaching tank, and supplementing 25m 3 Controlling the liquid-solid ratio to be 5:1, simultaneously slowly adding 92.5% concentrated sulfuric acid into a leaching tank, opening a steam valve to heat, controlling the reaction temperature to be 85 ℃, controlling the reaction time to be 4 hours, controlling the final acid to be 125g/l, and ending the reaction after adding 1290g of sulfuric acid to filter-press to obtain filter residues and filtrate;
step (2): purifying: and (3) putting the treated zinc-containing waste leachate into a leaching filter press to carry out filter pressing, adding 50 g of potassium permanganate into an oxidation tank to carry out iron removal reaction after the filtrate enters a primary purification process, reacting for 0.5h, removing iron in the solution as much as possible, wherein filter residues are iron residues, putting the filtrate into a secondary purification process, controlling the temperature to be 85 ℃, adding 31 g of zinc powder to carry out displacement copper and cadmium removal reaction, and putting the filtrate into the filter press to carry out filtration after the secondary purification process, wherein the pH of the secondary purification end point is 4.5, reacting for 35min, and putting the filtrate into the filter press to carry out filtration after the secondary purification, wherein the secondary purification filter residues are copper and cadmium residues, and carrying out a subsequent zinc precipitation process on the secondary postliquid.
Step (3): zinc precipitation: adding 1345g of sodium carbonate into the solution after secondary purification to carry out zinc precipitation reaction, controlling the temperature to 95 ℃, measuring the PH value once at intervals of 15 minutes, ending the zinc precipitation reaction when the PH value reaches 6.5 and measuring Zn, wherein the generated precipitation product is basic zinc carbonate 2+ 0.65g/l, and the filter residue is repeatedly washed by the production water to remove Cl - After the ions are separated from liquid and solid, the main component of the filtrate is sodium sulfate which is used as a jarosite iron precipitation neutralizer in the leaching process, and the filter cake is subjected to the subsequent drying and baking process.
Active zinc oxide mass: znO:97.82%, water soluble salt: 0.70%, H20:0.63%.
Example 2
On the basis of example 1, example 2 differs from example 1 in that: the main components of the zinc waste material are as follows: znO:90%, fe:4%, cu, cd:1.2%.
Step (1): leaching of zinc-containing waste: 1100g of zinc-containing waste is fed to 40m of zinc waste 3 Pulping and leaching the mixture, and supplementing the mixture into a leaching tank for 30m 3 Controlling the liquid-solid ratio to be 6:1, simultaneously slowly adding 92.5% of concentrated sulfuric acid into a leaching tank, opening a steam valve to heat, controlling the reaction temperature to be 90 ℃, controlling the reaction time to be 3.5h, controlling the final acid to be 128g/l, and after the amount of sulfuric acid is 1420g, ending the reaction and carrying out filter pressing to obtain filter residues and filtrate;
step (2): purifying: the treated zinc-containing waste leachate enters a leaching filter press to be subjected to filter pressing, 38 g of potassium permanganate is added into an oxidation tank to carry out iron removal reaction after the filtrate enters a primary purification process, the reaction time is 0.5h, iron in the solution is removed as far as possible, filter residues are iron residues, the filtrate enters a secondary purification process, the temperature is controlled to be 90 ℃, 28g of zinc powder is added to carry out displacement copper and cadmium removal reaction, the secondary purification endpoint PH is 4.5, the reaction time is 40min, the filtrate enters the filter press to be filtered after the secondary purification is finished, the secondary purification filter residues are copper and cadmium residues, and the secondary postliquid is subjected to a subsequent zinc precipitation process.
Step (3): zinc precipitation: adding 1480g of sodium carbonate into the solution after secondary purification to carry out zinc precipitation reaction, controlling the temperature to 93 ℃, measuring the PH value once at intervals of 15 minutes, ending the zinc precipitation reaction when the PH value reaches 6.0, generating a precipitation product of basic zinc carbonate, and measuring Zn 2+ 0.68g/l, and the filter residue is repeatedly washed by the production water to remove Cl - After the ions are separated from liquid and solid, the main component of the filtrate is sodium sulfate which is used as a jarosite iron precipitation neutralizer in the leaching process, and the filter cake is subjected to the subsequent drying and baking process.
Step (4): drying and baking: washing and dechlorinating the precipitate after zinc precipitation, drying at 100 ℃, drying the water in the precipitate until the water content in the precipitate is 10.53%, baking for 7 hours at 480 ℃, and crushing and screening to obtain the active zinc oxide product.
Active zinc oxide mass: znO:98.43%, water soluble salt: 0.65%, H20:0.40%.
Example 3
On the basis of example 1, example 3 differs from examples 1 and 2 in that: the main components of the zinc waste material are as follows: : znO:88%, fe:3%, cu, cd:1.6%.
Step (1): leaching of zinc-containing waste: 800g of zinc-containing waste was fed to 40m of zinc waste 3 Pulping and leaching the mixture in a tank, and supplementing 28m 3 Controlling the liquid-solid ratio to be 5:1, simultaneously slowly adding 92.5% of concentrated sulfuric acid into a leaching tank, opening a steam valve to heat, controlling the reaction temperature to be 95 ℃, controlling the reaction time to be 3h, controlling the final acid to be 130g/l, and ending the reaction after adding 1420g of sulfuric acid to filter-press, thereby obtaining filter residues and filtrate;
step (2): purifying: and (3) putting the treated zinc-containing waste leachate into a leaching filter press to carry out filter pressing, adding 30g of potassium permanganate into an oxidation tank to carry out iron removal reaction after the filtrate enters a primary purification process, reacting for 0.5h, removing iron in the solution as much as possible, wherein filter residues are iron residues, putting the filtrate into a secondary purification process, controlling the temperature to 94 ℃, adding 33 g of zinc powder to carry out displacement copper and cadmium removal reaction, and putting the filtrate into the filter press to carry out filtration after the secondary purification process, wherein the pH of the secondary purification end point is 4.5, reacting for 35min, and putting the secondary purification end point into the filter press to carry out filtration, wherein the secondary purification filter residues are copper and cadmium residues, and the secondary postliquid is subjected to a subsequent zinc precipitation process.
Step (3): zinc precipitation: adding 1120g of sodium carbonate into the solution after secondary purification to carry out zinc precipitation reaction, controlling the temperature to 98 ℃, measuring the PH value once at intervals of 15 minutes, ending the zinc precipitation reaction when the PH value reaches 7.0 and measuring Zn, wherein the generated precipitation product is basic zinc carbonate 2+ 0.70g/l, and the filter residue is repeatedly washed by the production water to remove Cl - After the ions are separated from liquid and solid, the main component of the filtrate is sodium sulfate which is used as a jarosite iron precipitation neutralizer in the leaching process, and the filter cake is subjected to the subsequent drying and baking process.
Step (4): drying and baking: washing and dechlorinating the precipitate after zinc precipitation, drying at 100 ℃, drying the water in the precipitate to obtain a precipitate with 13.36% of water content, baking at 500 ℃ for 6.5h, and crushing and screening to obtain an active zinc oxide product.
Active zinc oxide mass: znO:98.35%, water soluble salt: 0.63%, H 2 0：0.54％。
The enterprise standards for the quality of the active zinc oxide product are listed in table 1 below.
TABLE 1 Standard of active Zinc oxide enterprises (%)
The method for producing active zinc oxide by utilizing zinc waste material has high purification degree and less impurity content, and the zinc waste material is used as raw material to recover the zinc waste material, so that the economic benefit is improved, the environmental pollution is reduced, and the original distillation method is replaced.
The foregoing has outlined the detailed description of the embodiments of the present invention, and the detailed description of the embodiments and the embodiments of the present invention has been provided herein by way of illustration of specific examples, which are intended to be merely illustrative of the principles of the embodiments of the present invention.
Claims (2)
1. A process for producing active zinc oxide from zinc waste, comprising the steps of:
s1, leaching zinc-containing waste: leaching the zinc-containing waste material with industrial sulfuric acid to dissolve zinc compounds in the zinc-containing material into zinc sulfate, and forming residues from insoluble solids; the mixed ore pulp obtained in the leaching production process is subjected to liquid-solid separation, impurities such as Fe, mn, cu, cd and the like are removed from the zinc solution after the liquid-solid separation through two-stage purification, a solution with high zinc content and residues with low zinc content are formed, filter residues are piled up, and the filtrate is subjected to subsequent purification treatment; the main reaction is as follows:
ZnO+H 2 SO 4 ＝ZnSO 4 +H 2 O
PbO+H 2 SO 4 ＝PbSO 4 ↓+H 2 O
CdO+H 2 SO 4 ＝CdSO 4 +H 2 O
CuO+H 2 SO 4 ＝CdSO 4 +H 2 O
FeO+H 2 SO 4 ＝FeSO 4 +H 2 O
s2, purifying: adding potassium permanganate into the filtrate after liquid-solid separation for primary purification, removing iron and manganese in the filtrate, and primarily purifying filter residues into iron slag; the primary purification is carried out on the liquid, the zinc powder is added to replace copper and cadmium in the leaching liquid, the copper and cadmium in the leaching liquid are removed, the secondary purification filter residue is copper and cadmium slag, and the secondary liquid is subjected to the subsequent zinc precipitation process; the main reactions are as follows:
2KMnO 4 +3MnSO 4 +2H 2 O＝K 2 SO 4 +5MnO 2 ↓+2H 2 SO 4
5Fe 2+ +MnO 4 - +8H + ＝5Fe 3+ +Mn 2+ +4H 2 O
Fe 2 (SO 4 ) 3 +6H 2 O＝2Fe(OH) 3 ↓+3H 2 SO 4
s3, zinc precipitation: adding sodium carbonate into the solution after secondary purification to carry out zinc precipitation reaction, generating a precipitation product basic zinc carbonate, and repeatedly washing filter residues with production water to remove Cl - After the ions are separated from liquid and solid, the main component of the filtrate is sodium sulfate used as a jarosite iron precipitation neutralizer in the leaching process, and the filter cake is subjected to the subsequent drying and baking process; the main reactions are as follows:
3ZnSO 4 +3Na 2 CO 3 +H 2 O＝ZnCO 3 ·2Zn(OH) 2 ↓+3Na 2 SO 4 +2CO 2 ↑
s4, drying and baking: removing chlorine from the precipitate after zinc precipitation, drying at 100deg.C, drying water in the precipitate, baking at 400-500deg.C for 5-7 hr, pulverizing, and sieving to obtain active zinc oxide product; the main reactions are as follows:
ZnCO 3 ·2Zn(OH) 2 ＝3ZnO+CO 2 ↑+2H 2 O↑。
2. a process for producing active zinc oxide from zinc scrap according to claim 1, wherein: the method comprises the steps of leaching zinc-containing waste, purifying, removing impurities, precipitating zinc, drying, baking and the like, so as to purify zinc in the zinc-containing waste; the purified basic zinc carbonate precipitate is used as a raw material to prepare a basic zinc carbonate raw material by adopting a drying and baking method, and the active zinc oxide product is obtained through the procedures of crushing, screening and the like.
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| CN202310565334.2A CN116692928A (en) | 2023-05-18 | 2023-05-18 | Process for producing active zinc oxide by using zinc waste |
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| CN202310565334.2A CN116692928A (en) | 2023-05-18 | 2023-05-18 | Process for producing active zinc oxide by using zinc waste |
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