CN112657998A - Chemical pretreatment agent and chemical pretreatment method for calcium sulfate slag of gold smelting acid station - Google Patents
Chemical pretreatment agent and chemical pretreatment method for calcium sulfate slag of gold smelting acid station Download PDFInfo
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- CN112657998A CN112657998A CN201910981717.1A CN201910981717A CN112657998A CN 112657998 A CN112657998 A CN 112657998A CN 201910981717 A CN201910981717 A CN 201910981717A CN 112657998 A CN112657998 A CN 112657998A
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- calcium sulfate
- sulfate slag
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- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 title claims abstract description 166
- 239000002893 slag Substances 0.000 title claims abstract description 83
- 239000000126 substance Substances 0.000 title claims abstract description 40
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 34
- 238000003723 Smelting Methods 0.000 title claims abstract description 29
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 title claims abstract description 24
- 239000010931 gold Substances 0.000 title claims abstract description 24
- 229910052737 gold Inorganic materials 0.000 title claims abstract description 24
- 239000002253 acid Substances 0.000 title claims abstract description 16
- 238000002203 pretreatment Methods 0.000 title claims abstract description 14
- 239000002002 slurry Substances 0.000 claims abstract description 45
- 239000002910 solid waste Substances 0.000 claims abstract description 14
- 239000002699 waste material Substances 0.000 claims abstract description 12
- 239000010865 sewage Substances 0.000 claims abstract description 9
- 238000003756 stirring Methods 0.000 claims abstract description 9
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910017053 inorganic salt Inorganic materials 0.000 claims abstract description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 20
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 claims description 8
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 claims description 5
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims description 5
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 3
- 239000001110 calcium chloride Substances 0.000 claims description 3
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 3
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 3
- 239000000292 calcium oxide Substances 0.000 claims description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 3
- 239000011790 ferrous sulphate Substances 0.000 claims description 3
- 235000003891 ferrous sulphate Nutrition 0.000 claims description 3
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims description 3
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 2
- 230000001105 regulatory effect Effects 0.000 abstract description 2
- 239000003814 drug Substances 0.000 description 12
- 238000004519 manufacturing process Methods 0.000 description 9
- 239000002351 wastewater Substances 0.000 description 8
- 238000002386 leaching Methods 0.000 description 7
- 230000001988 toxicity Effects 0.000 description 5
- 231100000419 toxicity Toxicity 0.000 description 5
- 230000007613 environmental effect Effects 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000013095 identification testing Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- ZODDGFAZWTZOSI-UHFFFAOYSA-N nitric acid;sulfuric acid Chemical compound O[N+]([O-])=O.OS(O)(=O)=O ZODDGFAZWTZOSI-UHFFFAOYSA-N 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 239000002686 phosphate fertilizer Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000011085 pressure filtration Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
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- Treatment Of Sludge (AREA)
Abstract
The invention discloses a chemical pretreatment agent and a chemical pretreatment method for calcium sulfate slag of a gold smelting waste acid station, wherein the chemical pretreatment agent comprises 6-30 parts by weight of an inorganic salt reducing agent and 700 parts by weight of industrial acid regulating solid waste; the method comprises the following steps: 1) adjusting the water content of the calcium sulfate slag of the gold smelting sewage station to 30-40% to obtain calcium sulfate slag slurry for later use; 2) adding a chemical pretreatment agent into the calcium sulfate slag slurry, wherein the dosage of the chemical pretreatment agent is 106-730 parts by weight based on 100 parts by weight of dry weight of the calcium sulfate slag slurry; 3) stirring for 15-60 min; standing for more than 1d at room temperature to obtain the pretreated calcium sulfate slag. The invention can carry out chemical pretreatment on the pH value, and the pretreatment effect is better.
Description
Technical Field
The invention belongs to the technical field of smelting waste residue treatment in the non-ferrous smelting industry, and particularly relates to a chemical pretreatment agent and a chemical pretreatment method for calcium sulfate slag of a gold smelting waste acid station.
Background
In recent years, the gold smelting industry in China develops rapidly, but resource shortage and environmental pollution are still bottlenecks in development. SO in the process of pyrometallurgical smelting2After the flue gas is used as a raw material for preparing acid, harmful substances such as arsenic, cadmium and the like in minerals are roasted at high temperature and enter a gas phase in the form of oxides, a part of heavy metals are removed and can be recovered, and the other part of heavy metals enter acidic wastewater after being washed by the flue gas, namely waste acid for short.
A large amount of waste acid generated by the gold smelting system during the preparation of sulfuric acid is subjected to medicament treatment and filter pressing to generate a large amount of calcium sulfate slag.
The calcium sulfate slag has large inventory, increases the production cost of enterprises, and has the problems to be solved urgently by pretreating the calcium sulfate slag and developing a pretreatment medicament formula, so the calcium sulfate slag has very important significance for environmental management and promotion of sustainable development of social economy; meanwhile, the contradiction of the outstanding environmental problem of solid waste stockpiling in the key field can be practically solved, and support is provided for the smelting waste residue environmental management policy and technical research work generated in the nonferrous smelting industry.
Therefore, the development of a chemical pretreatment method for gold smelting calcium sulfate slag is urgently needed.
Disclosure of Invention
The invention aims to provide a chemical pretreatment agent and a chemical pretreatment method for calcium sulfate slag in a gold smelting sewage station, which can be used for treating calcium sulfate slag in the gold smelting industry, performing a dangerous waste identification test on the calcium sulfate slag to judge whether the calcium sulfate slag is dangerous waste or not, performing a solid waste type analysis test on the calcium sulfate slag to judge whether the calcium sulfate slag is general I-type industrial solid waste or general II-type industrial solid waste or not, so that the calcium sulfate slag is comprehensively utilized, and chemical pretreatment is performed on indexes exceeding leaching toxicity or corrosivity standards to ensure that the indexes are lower than the leaching toxicity or corrosivity standard values.
In order to achieve the purpose, the invention adopts the following technical scheme:
a chemical pretreatment agent for calcium sulfate slag of a gold smelting acid-contaminated site comprises 6-30 parts by weight of an inorganic salt reducing agent and 700 parts by weight of industrial acid-regulating solid waste.
Preferably, the chemical pretreatment agent comprises 15 parts by weight of an inorganic reducing agent and 400 parts by weight of industrial acid-regulating solid waste (wherein 15 parts by weight of ferric sulfate, 30 parts by weight of mud-containing dilute sulfuric acid, 360 parts by weight of phosphogypsum and 10 parts by weight of tailings).
Preferably, the inorganic salt reducing agent is one or more of calcium oxide, calcium chloride, ferric sulfate and ferrous sulfate.
Preferably, the industrial acid-regulating solid waste refers to one or more of mud-containing dilute sulfuric acid, phosphogypsum and tailings. Wherein, the mud-containing dilute sulfuric acid refers to the production of acid cleaning and purifying process in sulfuric acid industry, the phosphogypsum is produced by phosphate fertilizer and phosphoric acid production process, and the tailings are produced by mine ore dressing process.
It is another object of the present invention to provide a method of chemical pretreatment based on the above chemical pretreatment agent, the method comprising the steps of:
1) firstly, regulating the moisture content of the calcium sulfate slag to 30-40% to obtain calcium sulfate slag slurry for later use;
2) adding chemical pretreatment agents (including inorganic salt reducing agents and industrial acid regulation solid wastes) into the calcium sulfate slag slurry, wherein the dosage of the chemical pretreatment agents is 106-730 parts by weight based on 100 parts by weight of dry weight of the calcium sulfate slag slurry;
3) stirring in an electric stirrer at a rotation speed of 110-; 4) standing for more than 1d at room temperature to obtain pretreated calcium sulfate slag;
sampling the calcium sulfate slag after chemical pretreatment, and performing leaching toxicity and corrosion tests according to a sulfuric acid-nitric acid method (HJ/T299-2007) of a solid waste leaching toxicity leaching method and a horizontal oscillation method (HJ 557-2010) of the solid waste leaching toxicity leaching method. The chemically pretreated calcium sulfate slag meets the regulations of relevant standards.
The calcium sulfate slag in the step 1) is directly generated after being subjected to pressure filtration by a gold smelting waste acid station.
Compared with the prior art, the invention has the following advantages: the effect of effectively reducing the pH value of the calcium sulfate slag can be realized, the pH value meets the requirement of the primary standard of Integrated wastewater discharge Standard (GB 8978-.
Drawings
FIG. 1 is a flow chart of the chemical pretreatment method of the present invention.
Detailed Description
The invention is described in further detail below with reference to the figures and the detailed description.
Example 1
As shown in fig. 1, a chemical pretreatment method of pH value in calcium sulfate slag comprises the following steps:
1) calcium sulfate slag slurry (with the water content of 30-40%) produced in the production flow of a gold smelting sewage station is reserved, and a pretreatment agent is added into the calcium sulfate slag slurry, wherein the dosage of the pretreatment agent is 106 parts by weight (6 parts by weight of ferric sulfate and 100 parts by weight of mud-containing dilute sulfuric acid) based on 100 parts by weight of dry weight of the calcium sulfate slag slurry;
2) adding the prepared chemical pretreatment agent into the calcium sulfate slag slurry, stirring the mixed pretreatment agent and the calcium sulfate slag slurry for 20min at the rotating speed of 110r/min, and standing for 3 d;
3) the pretreatment rate of the pH value of the pretreated calcium sulfate slag slurry is reduced by 20.28 percent, namely the pH value meets the requirements of the first-level standard of Integrated wastewater discharge Standard (GB 8978-.
Example 2
As shown in fig. 1, a chemical pretreatment method of pH value in calcium sulfate slag comprises the following steps:
1) calcium sulfate slag slurry (with the water content of 30-40%) produced in the production flow of a gold smelting sewage station is reserved, pretreatment agents are added into the calcium sulfate slag slurry, and the dosage of the pretreatment agents is 530 parts by weight (10 parts by weight of calcium chloride, 20 parts by weight of mud-containing dilute sulfuric acid and 500 parts by weight of tailings) based on 100 parts by weight of dry weight of the calcium sulfate slag slurry;
2) adding the prepared pretreatment medicament into the calcium sulfate slag slurry, stirring the mixed pretreatment medicament and the calcium sulfate slag slurry for 20min at the rotating speed of 110r/min, and standing for 2 d;
3) the pretreated calcium sulfate slag slurry is obtained, the pretreatment rate of the pH value is reduced by 15.7 percent, namely the pH value meets the requirements of the first-class standard of Integrated wastewater discharge Standard (GB 8978-.
Example 3
As shown in fig. 1, a chemical pretreatment method of pH value in calcium sulfate slag comprises the following steps:
1) calcium sulfate slag slurry (with the water content of 30-40%) produced in the production flow of a gold smelting sewage station is reserved, and a pretreatment agent is added into the calcium sulfate slag slurry, wherein the dosage of the pretreatment agent is 520 parts by weight (10 parts by weight of calcium oxide, 500 parts by weight of phosphogypsum and 10 parts by weight of tailings) based on 100 parts by weight of dry weight of the calcium sulfate slag slurry;
2) adding the prepared pretreatment medicament into the calcium sulfate slag slurry, stirring the mixed pretreatment medicament and the calcium sulfate slag slurry for 20min at the rotating speed of 110r/min, and standing for 1 d;
3) the pretreated calcium sulfate slag slurry is obtained, the pretreatment rate of the pH value is reduced by 20.1 percent, namely the pH value meets the requirements of the first-class standard of Integrated wastewater discharge Standard (GB 8978-.
Example 4
As shown in fig. 1, a chemical pretreatment method of pH value in calcium sulfate slag comprises the following steps:
1) calcium sulfate slag slurry (with the water content of 30-40%) produced in the production flow of a gold smelting sewage station is reserved, and a pretreatment agent is added into the calcium sulfate slag slurry, wherein the dosage of the pretreatment agent is 220 parts by weight (20 parts by weight of ferrous sulfate, 150 parts by weight of phosphogypsum and 50 parts by weight of mud-containing dilute sulfuric acid) based on 100 parts by weight of dry weight of the calcium sulfate slag slurry;
2) adding the prepared pretreatment medicament into the calcium sulfate slag slurry, stirring the mixed pretreatment medicament and the calcium sulfate slag slurry for 15min at the rotating speed of 200r/min, and standing for 1 d;
3) the pretreated calcium sulfate slag slurry is obtained, the pretreatment rate of the pH value is reduced by 22.5 percent, namely the pH value meets the requirements of the first-class standard of Integrated wastewater discharge Standard (GB 8978-.
Example 5
As shown in fig. 1, a chemical pretreatment method of pH value in calcium sulfate slag comprises the following steps:
1) calcium sulfate slag slurry (with the water content of 30-40%) produced in the production flow of a gold smelting sewage station is reserved, a pretreatment agent is added into the calcium sulfate slag slurry, and the dosage of the pretreatment agent is 415 parts by weight (15 parts by weight of ferric sulfate, 30 parts by weight of mud-containing dilute sulfuric acid, 360 parts by weight of phosphogypsum and 10 parts by weight of tailings) based on 100 parts by weight of dry weight of the calcium sulfate slag slurry;
2) adding the prepared pretreatment medicament into the calcium sulfate slag slurry, stirring the mixed pretreatment medicament and the calcium sulfate slag slurry for 60min at the rotating speed of 160r/min, and standing for 1 d;
3) the pretreated calcium sulfate slag slurry is obtained, the pretreatment rate of the pH value is reduced by 23.1 percent, namely the pH value meets the requirements of the first-class standard of Integrated wastewater discharge Standard (GB 8978-.
Example 6
As shown in fig. 1, a chemical pretreatment method of pH value in calcium sulfate slag comprises the following steps:
1) calcium sulfate slag slurry (with the water content of 30-40%) produced in the production flow of a gold smelting sewage station is reserved, a pretreatment agent is added into the calcium sulfate slag slurry, and the dosage of the pretreatment agent is 730 parts by weight (30 parts by weight of ferric chloride and 700 parts by weight of phosphogypsum) based on 100 parts by weight of dry weight of the calcium sulfate slag slurry;
2) adding the prepared pretreatment medicament into the calcium sulfate slag slurry, stirring the mixed pretreatment medicament and the calcium sulfate slag slurry for 50min at the rotating speed of 130r/min, and standing for 1 d;
3) the pretreated calcium sulfate slag slurry is obtained, the pretreatment rate of the pH value is reduced by 22.2 percent, namely the pH value meets the requirements of the first-class standard of Integrated wastewater discharge Standard (GB 8978-.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (5)
1. The chemical pretreatment agent for the calcium sulfate slag of the gold smelting acid-contaminated site is characterized by comprising 6-30 parts by weight of an inorganic salt reducing agent and 700 parts by weight of industrial acid-regulating solid waste.
2. The chemical pretreatment agent for the calcium sulfate slag of the gold smelting waste acid station as claimed in claim 1, wherein the chemical pretreatment agent comprises 15 parts by weight of inorganic reducing agent and 400 parts by weight of industrial acid-regulating solid waste.
3. The chemical pretreatment agent for the calcium sulfate slag of the gold smelting waste acid station according to claim 1 or 2, wherein the inorganic salt reducing agent is one or more of calcium oxide, calcium chloride, ferric sulfate and ferrous sulfate.
4. The chemical pretreatment agent for the calcium sulfate slag of the gold smelting waste acid station according to claim 1 or 2, wherein the industrial acid regulation solid waste is one or more of mud-containing dilute sulfuric acid, phosphogypsum and tailings.
5. A chemical pretreatment method of calcium sulfate slag of a gold smelting acid station comprises the following steps:
1) adjusting the water content of the calcium sulfate slag of the gold smelting sewage station to 30-40% to obtain calcium sulfate slag slurry for later use;
2) adding a chemical pretreatment agent into the calcium sulfate slag slurry, wherein the dosage of the chemical pretreatment agent is 106-730 parts by weight based on 100 parts by weight of dry weight of the calcium sulfate slag slurry;
3) stirring for 15-60 min; standing for more than 1d at room temperature to obtain the pretreated calcium sulfate slag.
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|---|---|---|---|---|
| US20030065238A1 (en) * | 1999-03-23 | 2003-04-03 | Hale Edward Carroll | Sulfite treatment of spent industrial wastes |
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| CN103121763A (en) * | 2012-11-30 | 2013-05-29 | 中南民族大学 | Process for treating high-arsenic and high cadmium waste acid by using three-stage lime-ferric salt method |
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| CN109913659A (en) * | 2019-02-27 | 2019-06-21 | 郴州钖涛环保科技有限公司 | A kind of method of antimony smelting arsenic alkali slag and flue gas during smelting comprehensive treatment |
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2019
- 2019-10-16 CN CN201910981717.1A patent/CN112657998B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030065238A1 (en) * | 1999-03-23 | 2003-04-03 | Hale Edward Carroll | Sulfite treatment of spent industrial wastes |
| CN102115270A (en) * | 2009-12-31 | 2011-07-06 | 株洲冶炼集团股份有限公司 | Method for processing waste acid generated in process of preparing acid from metal smelting fume |
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