CN112279294A - Production method of zinc oxide - Google Patents
Production method of zinc oxide Download PDFInfo
- Publication number
- CN112279294A CN112279294A CN202011186189.XA CN202011186189A CN112279294A CN 112279294 A CN112279294 A CN 112279294A CN 202011186189 A CN202011186189 A CN 202011186189A CN 112279294 A CN112279294 A CN 112279294A
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- Prior art keywords
- zinc
- zinc oxide
- sulfate solution
- temperature
- lead
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y40/00—Manufacture or treatment of nanostructures
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/64—Nanometer sized, i.e. from 1-100 nanometer
Abstract
The method comprises the steps of uniformly mixing waste residues containing lead and zinc, such as steel mill dust, gas ash and the like, with coke, roasting in a rotary kiln, enabling the lead and zinc in the zinc residues to form a gaseous form and be reduced with carbon, enabling high-temperature zinc steam to react with oxygen in the air to generate zinc oxide, then enabling the zinc oxide to enter U-shaped cooling equipment for cooling and sedimentation, and sending the zinc oxide into a cloth bag collecting device by using an induced draft fan to collect secondary zinc oxide; the method comprises the following steps of (1) adding sulfuric acid to react with zinc hypoxide serving as a raw material to generate a zinc sulfate solution, oxidizing and replacing harmful metals such as lead, arsenic and cadmium to prepare a pure zinc sulfate solution, wherein the zinc sulfate and soda ash are synthesized by adopting multi-point control, so that the structure of basic zinc carbonate is ensured; rinsing the synthesized product for 3 times, performing solid-liquid separation by using a membrane filter press, drying the natural gas flash steam, grading the particle size, passing through a vibrating screen, calcining the dried product in an adjustable electric return brick kiln at the temperature of 400-500 ℃ to generate zinc oxide, wherein the prepared zinc oxide reaches the nanometer level of 1-100 and reaches the standard of active zinc oxide.
Description
Technical Field
The invention relates to the field of nonferrous metallurgy chemical processing, in particular to a production method of zinc oxide.
Background
Zinc oxide is a commonly used chemical additive, and is widely applied to the manufacture of products such as plastics, silicate products, synthetic rubber, lubricating oil, paint, coating, ointment, adhesive, food, batteries, flame retardant and the like. The existing zinc oxide production method mainly adopts indirect method and direct method to produce products, the granularity is 0.1 to several millimeters, the specific surface area is small, the quality is low, and the nano-scale requirements cannot be met. Therefore, a method for producing nano-scale active zinc oxide is needed.
The active zinc oxide is a multifunctional novel inorganic material, and the particle size of the active zinc oxide is about 1-100 nanometers. Due to the fine grain, the surface electronic structure and the crystal structure of the crystal grain are changed, and the characteristics of surface effect, volume effect, quantum size effect, macroscopic tunnel effect, high transparency, high dispersibility and the like which are not possessed by macroscopic objects are generated. According to the records, the zinc oxide has been found to exhibit a plurality of special functions in the aspects of catalysis, optics, magnetism, mechanics and the like, so that the zinc oxide has important application values in a plurality of fields of ceramics, chemical industry, electronics, optics, biology, medicine and the like, and has specificity and application which can not be compared with common zinc oxide.
Disclosure of Invention
The invention aims to provide a production method of zinc oxide, which improves the production efficiency of zinc oxide.
The technical problem solved by the invention can be realized by adopting the following technical scheme:
a production method of zinc oxide comprises the following steps:
the method comprises the following steps: uniformly mixing the waste residue containing lead and zinc with coke, and roasting by a rotary kiln; the roasting temperature of the rotary kiln is 1200-1300 ℃, and the roasting time is half an hour;
step two: cooling and settling the roasted material in the step one by U-shaped cooling equipment, wherein the U-shaped cooling equipment comprises a cooling pipeline, a cyclone collector, a bag-type dust collector and an induced draft fan, the induced draft fan sends the material into the cyclone collector and a bag-type collecting device to collect the zinc hypoxide, the temperature of the cooled material is 80-100 ℃, and the power of the induced draft fan is 132 kilowatts;
step three: adding sulfuric acid into the zinc hypoxide collected in the step two as a raw material to react to generate a zinc sulfate solution;
step four: adding soda ash into the zinc sulfate solution obtained in the third step for synthesis;
step five: rinsing the synthesized product for 3 times by using water, and rinsing to remove sodium salt substances;
step six: performing solid-liquid separation on the product rinsed in the fifth step by using a diaphragm filter press, wherein the power of the diaphragm filter press is 15 kilowatts, and the water content of the material subjected to filter pressing is 20%;
step seven: the filter cake after the filter pressing in the step six passes through a cyclone dryer and is dried by natural gas flash evaporation airflow, the drying temperature is 400 ℃, and the grading particle size is controlled to be 200 meshes;
step eight: screening the dried product in the seventh step by using a vibrating screen, wherein the mesh number of the vibrating screen is 325 meshes;
step nine: and (5) returning the screened product in the step eight to the brick kiln for calcining for 1 hour by adjustable electricity, controlling the calcining temperature at 400-500 ℃ and generating the active zinc oxide.
Preferably, the waste residue containing lead and zinc in the step one is a mixture of zinc, lead, cadmium, iron and manganese.
Preferably, the amount of sulfuric acid added in step three is measured by zinc content and pH value, and the reaction time is 1 hour.
Preferably, the ratio of the soda ash solution to the zinc sulfate solution in the fourth step is based on the equivalence of zinc ions and sodium ions, and the operation is automatically controlled through the pH value.
The method comprises the steps of uniformly mixing waste residues containing lead and zinc, such as steel mill dust, gas ash and the like, with coke, roasting in a rotary kiln, enabling the lead and zinc in the zinc residues to form a gaseous form and be reduced with carbon, enabling high-temperature zinc steam to react with oxygen in the air to generate zinc oxide, then enabling the zinc oxide to enter U-shaped cooling equipment for cooling and sedimentation, and sending the zinc oxide into a cloth bag collecting device by using an induced draft fan to collect secondary zinc oxide; the method comprises the following steps of (1) adding sulfuric acid to react with zinc hypoxide serving as a raw material to generate a zinc sulfate solution, oxidizing and replacing harmful metals such as lead, arsenic and cadmium to prepare a pure zinc sulfate solution, wherein the zinc sulfate and soda ash are synthesized by adopting multi-point control, so that the structure of basic zinc carbonate is ensured; rinsing the synthesized product for 3 times, performing solid-liquid separation by using a membrane filter press, drying the natural gas flash steam, grading the particle size, passing through a vibrating screen, calcining the dried product in an adjustable electric return brick kiln at the temperature of 400-500 ℃ to generate zinc oxide, wherein the prepared zinc oxide reaches the nanometer level of 1-100 and reaches the standard of active zinc oxide.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.
A production method of zinc oxide comprises the following steps in sequence:
a production method of zinc oxide comprises the following steps:
the method comprises the following steps: uniformly mixing waste residues containing lead and zinc, such as steel mill dust removal ash, gas ash and the like, with coke, and roasting in a rotary kiln; the roasting temperature of the rotary kiln is 1200-1300 ℃, and the roasting time is half an hour; the waste residue containing lead and zinc is the mixture of zinc, lead, cadmium, iron and manganese.
Step two: and (2) cooling and settling the roasted material in the step one by using U-shaped cooling equipment, wherein the U-shaped cooling equipment comprises a cooling pipeline, a cyclone collector, a bag-type dust collector and an induced draft fan, the induced draft fan sends the material into the cyclone collector and the bag-type dust collector to collect the zinc hypoxide, the temperature of the cooled material is 80-100 ℃, and the power of the induced draft fan is 132 kilowatts.
Step three: adding sulfuric acid into the zinc hypoxide collected in the step two as a raw material to react to generate a zinc sulfate solution; the amount of sulfuric acid added is measured by zinc content and pH value, and the reaction time is 1 hour.
Step four: adding soda ash into the zinc sulfate solution obtained in the third step for synthesis; the ratio of the soda ash to the zinc sulfate solution is based on the equal ratio of zinc ions to sodium ions, and the operation is automatically controlled through the pH value.
Step five: rinsing the synthesized product for 3 times by using water, and rinsing to remove sodium salt substances;
step six: and (5) performing solid-liquid separation on the product rinsed in the step five by using a diaphragm filter press, wherein the power of the diaphragm filter press is 15 kilowatts, and the water content of the material after filter pressing is 20%.
Step seven: and (5) passing the filter cake obtained after the filter pressing in the step six through a cyclone drier, drying by using natural gas flash evaporation airflow, wherein the drying temperature is 400 ℃, and the grading particle size is controlled to be 200 meshes.
Step eight: and seventhly, screening the dried product by using a vibrating screen, wherein the mesh number of the vibrating screen is 325.
Step nine: and (5) returning the screened product in the step eight to the brick kiln for calcining for 1 hour by adjustable electricity, controlling the calcining temperature at 400-500 ℃ and generating the active zinc oxide.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so that any minor modifications, equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention still belong to the protection scope of the present invention.
Claims (4)
1. A production method of zinc oxide is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: uniformly mixing the waste residue containing lead and zinc with coke, and roasting by a rotary kiln; the roasting temperature of the rotary kiln is 1200-1300 ℃, and the roasting time is half an hour;
step two: cooling and settling the roasted material in the step one by U-shaped cooling equipment, wherein the U-shaped cooling equipment comprises a cooling pipeline, a cyclone collector, a bag-type dust collector and an induced draft fan, the induced draft fan sends the material into the cyclone collector and a bag-type collecting device to collect the zinc hypoxide, the temperature of the cooled material is 80-100 ℃, and the power of the induced draft fan is 132 kilowatts;
step three: adding sulfuric acid into the zinc hypoxide collected in the step two as a raw material to react to generate a zinc sulfate solution;
step four: adding soda ash into the zinc sulfate solution obtained in the third step for synthesis;
step five: rinsing the synthesized product for 3 times by using water, and rinsing to remove sodium salt substances;
step six: performing solid-liquid separation on the product rinsed in the fifth step by using a diaphragm filter press, wherein the power of the diaphragm filter press is 15 kilowatts, and the water content of the material subjected to filter pressing is 20%;
step seven: the filter cake after the filter pressing in the step six passes through a cyclone dryer and is dried by natural gas flash evaporation airflow, the drying temperature is 400 ℃, and the grading particle size is controlled to be 200 meshes;
step eight: screening the dried product in the seventh step by using a vibrating screen, wherein the mesh number of the vibrating screen is 325 meshes;
step nine: and (5) returning the screened product in the step eight to the brick kiln for calcining for 1 hour by adjustable electricity, controlling the calcining temperature at 400-500 ℃ and generating the active zinc oxide.
2. The method for producing zinc oxide according to claim 1, wherein: in the step one, the waste residue containing lead and zinc is a mixture of zinc, lead, cadmium, iron and manganese.
3. The method for producing zinc oxide according to claim 1, wherein: in the third step, the amount of the added sulfuric acid is measured by the zinc content and the pH value, and the reaction time is 1 hour.
4. The method for producing zinc oxide according to claim 1, wherein: and fourthly, the ratio of the soda ash to the zinc sulfate solution is based on the equivalence of zinc ions and sodium ions, and the operation is automatically controlled through the pH value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011186189.XA CN112279294A (en) | 2020-10-29 | 2020-10-29 | Production method of zinc oxide |
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| CN202011186189.XA CN112279294A (en) | 2020-10-29 | 2020-10-29 | Production method of zinc oxide |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5464596A (en) * | 1992-01-15 | 1995-11-07 | Metals Recycling Technologies Corp. | Method for treating waste streams containing zinc |
| CN1418972A (en) * | 2002-11-28 | 2003-05-21 | 王树楷 | Method for preparing nano active zinc oxide from low grade zinc containing material |
| WO2010096862A1 (en) * | 2009-02-24 | 2010-09-02 | Auszinc Metals & Alloys | Zinc oxide purification |
| CN204612504U (en) * | 2015-01-27 | 2015-09-02 | 中钢集团马鞍山矿山研究院有限公司 | A kind of flue gas cooling dust arrester installation of external-heat reduction roasting rotary kiln |
| CN107285371A (en) * | 2017-07-21 | 2017-10-24 | 河北博泰环保科技有限公司 | The method for preparing feed grade zinc oxide using blast furnace dedusting ash and zinc waste residue |
| CN107460327A (en) * | 2017-07-28 | 2017-12-12 | 重庆科技学院 | A kind of comprehensive reutilization method of the leaded zinc powder dirt of electric furnace steel making |
-
2020
- 2020-10-29 CN CN202011186189.XA patent/CN112279294A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5464596A (en) * | 1992-01-15 | 1995-11-07 | Metals Recycling Technologies Corp. | Method for treating waste streams containing zinc |
| CN1418972A (en) * | 2002-11-28 | 2003-05-21 | 王树楷 | Method for preparing nano active zinc oxide from low grade zinc containing material |
| WO2010096862A1 (en) * | 2009-02-24 | 2010-09-02 | Auszinc Metals & Alloys | Zinc oxide purification |
| CN204612504U (en) * | 2015-01-27 | 2015-09-02 | 中钢集团马鞍山矿山研究院有限公司 | A kind of flue gas cooling dust arrester installation of external-heat reduction roasting rotary kiln |
| CN107285371A (en) * | 2017-07-21 | 2017-10-24 | 河北博泰环保科技有限公司 | The method for preparing feed grade zinc oxide using blast furnace dedusting ash and zinc waste residue |
| CN107460327A (en) * | 2017-07-28 | 2017-12-12 | 重庆科技学院 | A kind of comprehensive reutilization method of the leaded zinc powder dirt of electric furnace steel making |
Non-Patent Citations (3)
| Title |
|---|
| 王国军: "氧化铅锌矿制活性氧化锌工艺研究" * |
| 范兴祥;韩守礼;汪云华;吴跃东;: "利用含锌铜烟尘制备活性氧化锌和硫酸铜工艺研究" * |
| 谢雪平;祝伟诚;李文斌;: "挥发窑处理含锌浸出渣生产氧化锌的研究探讨" * |
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