CN111153412A - White carbon black production flow based on filtering washing liquid and sodium sulfate cyclic utilization - Google Patents
White carbon black production flow based on filtering washing liquid and sodium sulfate cyclic utilization Download PDFInfo
- Publication number
- CN111153412A CN111153412A CN202010043328.7A CN202010043328A CN111153412A CN 111153412 A CN111153412 A CN 111153412A CN 202010043328 A CN202010043328 A CN 202010043328A CN 111153412 A CN111153412 A CN 111153412A
- Authority
- CN
- China
- Prior art keywords
- carbon black
- white carbon
- sodium silicate
- filtering
- sodium sulfate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/113—Silicon oxides; Hydrates thereof
- C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
- C01B33/18—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof
- C01B33/187—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof by acidic treatment of silicates
- C01B33/193—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof by acidic treatment of silicates of aqueous solutions of silicates
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D5/00—Sulfates or sulfites of sodium, potassium or alkali metals in general
- C01D5/14—Preparation of sulfites
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Silicon Compounds (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
A white carbon black production flow based on filtering and washing liquid and sodium sulfate cyclic utilization is disclosed, wherein: mixing anhydrous sodium sulfate, quartz powder and coal powder, firing to prepare solid sodium silicate and generate sulfur dioxide gas, and absorbing the sulfur dioxide gas by using soda ash or caustic soda to obtain sodium sulfite; soaking solid sodium silicate in water to obtain liquid sodium silicate, diluting the liquid sodium silicate with white carbon black filtering and washing liquid, and filtering to obtain water glass with the concentration meeting the technical requirements of white carbon black production; reacting water glass with dilute sulfuric acid to obtain a crude white carbon black product, filtering and washing to obtain a wet white carbon black product, pulping the wet white carbon black product, and spraying and drying to obtain a finished white carbon black product; the anhydrous sodium sulfate obtained by evaporation and crystallization is returned to the production process of the solid sodium silicate to be used as a production raw material. Not only solves the problem of SO generated in the process of producing sodium silicate by a sodium sulfate method2The pollution to the environment, and the purposes of realizing zero discharge of the process wastewater in the white carbon black production process and recycling the sodium sulfate are achieved.
Description
Technical Field
The invention relates to the technical field of white carbon black production, in particular to a white carbon black production flow based on recycling of filter liquor and sodium sulfate.
Background
White carbon black, namely hydrated silica, is an inorganic silicon chemical product with wide application, and is widely applied to the fields of rubber, plastics, shoe making, paint, pesticide, daily chemicals and the like.
The production method of white carbon black mainly comprisesThe water glass is silicon source, and the inorganic acid is used as precipitating agent, and the used inorganic acid is mainly sulfuric acid, and secondly hydrochloric acid. In the process of producing the white carbon black by using sulfuric acid as a precipitating agent, a large amount of sodium sulfate-containing wastewater is generated, and from the current situation of China, about 25-35m of sodium sulfate-containing wastewater is generated every ton of white carbon black produced3. Because the sodium sulfate content of the wastewater is between 2.5 and 3.5 percent, the concentration is low, the treatment difficulty is high, and the wastewater is treated by adopting a discharge mode at present. The discharge of such waste water causes serious pollution to the environment.
The sodium sulfate method for producing white carbon black is to mix sodium sulfate, quartz powder and reduction coal powder, then put the mixture into a kiln to calcine the mixture to generate sodium silicate melt and SO2And (3) gas, cooling the sodium silicate melt to prepare solid sodium silicate, and leaching the solid sodium silicate with water to obtain liquid sodium silicate. Treating the liquid sodium silicate as silicon source with sulfuric acid or hydrochloric acid as precipitating agent, precipitating, aging, filtering, washing, drying and dispersing to obtain the final product. A large amount of process wastewater is generated and discharged in the production process. Because the sodium silicate production process has a large amount of SO2Gas is generated, and a reliable and effective disposal method is lacked, so the process is listed as an elimination technology by the state.
Disclosure of Invention
Aiming at the defects of large wastewater discharge amount and the like in the white carbon black industry in China, the invention aims to realize zero discharge of wastewater in the white carbon black production process and recycling of sodium sulfate, and innovates and researches on the basis of the eliminated sodium sulfate method sodium silicate production technology, and provides a white carbon black production flow based on recycling of filter washing liquid and sodium sulfate.
In order to achieve the purpose, the invention adopts the technical scheme that: the white carbon black production flow based on filtering and washing liquid and sodium sulfate recycling is characterized by comprising the following steps of:
1) mixing dried anhydrous sodium sulfate from a white carbon black filter washing liquid evaporation crystallization system with quartz powder and coal powder to obtain a mixture; sending the mixture into a reverberatory furnace or a horse shoe flame furnace for temperature-controlled ignition to generate sodium silicate melt and SO2Gas, sodium silicate meltsCooling to obtain solid sodium silicate;
2) SO generated by burning2Absorbing the gas with sodium carbonate or sodium hydroxide solution to generate sodium sulfite, evaporating the sodium sulfite solution for crystallization, separating, drying and packaging to obtain an anhydrous sodium sulfite product;
3) leaching and precipitating the solid sodium silicate obtained in the step 1) by using water and steam condensate water from a white carbon black filtering and washing liquid evaporation process, separating impurities to obtain liquid silicic acid, and diluting the liquid sodium silicate by using filtering and washing liquid from a white carbon black filtering and washing process to obtain a sodium silicate solution with the concentration meeting the process requirements;
4) sending the sodium silicate solution with the concentration meeting the technological requirements obtained in the step 3) to a white carbon black precipitation process, mixing the sodium silicate solution with dilute sulfuric acid obtained by diluting with a white carbon black filtering and washing solution to generate white carbon black precipitate, namely a white carbon black crude product, filtering and washing the white carbon black crude product to obtain a white carbon black wet product and a filtering and washing solution, mixing the white carbon black wet product with steam condensate, namely evaporation water, from a white carbon black filtering and washing solution evaporation process, pulping, and performing spray drying to obtain a white carbon black finished product;
5) sending part of the white carbon black filtering and washing liquid obtained in the previous step to an evaporation process, and obtaining anhydrous sodium sulfate through evaporation crystallization, separation and drying; returning the obtained anhydrous sodium sulfate to the sodium silicate production process to mix with quartz powder and coal powder for producing sodium silicate; the evaporation condensation water part is mixed with the wet white carbon black in the step 4) and is pulped; part of the solid water glass leaching process is used as a leaching agent;
6) respectively sending a part of the white carbon black filtrate obtained in the step 4) to a sulfuric acid dilution process and a liquid sodium silicate dilution process to be used as diluents; the diluted sulfuric acid and the sodium silicate solution with the concentration meeting the technological requirements are sent to a white carbon black precipitation procedure to be used as reactants.
In reverberatory or horse-shoe flame furnaces with SO2A sulfuric acid washing device is additionally arranged between the gas absorption devices, and SO is removed by acid washing2Trace SO contained in gas3(ii) a In order to prevent the oxidation phenomenon in the absorption process, an antioxidant is also added into the absorbent; the antioxidant is one or more of methanol, ethanol, thiosulfate and hydroquinoneAnd (4) combining.
The invention has the advantages that:
1. the problem of wastewater discharge generated in the white carbon black production process is solved by utilizing the filtering washing liquid generated in the white carbon black production process, namely recycling the process wastewater.
2. The filtration and washing liquid generated by filtering and washing the white carbon black is partially used as a concentrated sulfuric acid diluent, partially used as a liquid sodium silicate diluent and partially used as a white carbon black pulping dispersant, and partially sent to an evaporation process, namely, the cyclic utilization of process wastewater, so that the concentration of sulfate, namely sodium sulfate in the filtration and washing liquid is greatly improved, and the concentration of the sodium sulfate is improved from 2.5-3.5% in the prior industry to 14-18%, thereby greatly reducing the evaporation amount in the evaporation and crystallization process and reducing the production cost of the sodium sulfate.
3. Electrolyte sodium sulfate is introduced by recycling the filter washing liquid, so that the input of sodium sulfate serving as a dispersant is avoided, and the production cost of the white carbon black is reduced.
4. The by-product sodium sulfate is recovered by processing the filtrate and washing liquid, and the obtained sodium sulfate is used as a production raw material of sodium silicate, thereby realizing virtuous cycle of main raw materials in the production process.
5. SO generation by sodium metasilicate2The collection and absorption of the gas produce sodium sulfite products meeting the market requirements, which not only solves the problem of SO produced in the sodium silicate production process by the sodium sulfate method2Pollution problem to environment, and by the action of SO2The comprehensive utilization of the sodium sulfate can create good economic benefit, and the eliminated production process of producing the sodium silicate by the sodium sulfate method develops new vitality.
Drawings
The following describes in further detail specific embodiments of the present invention with reference to the accompanying drawings.
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The white carbon black production flow based on the recycling of the filter washing liquid and the sodium sulfate is characterized by comprising the following steps of:
1) evaporating the filtrate from the carbon blackMixing the dried anhydrous sodium sulfate, quartz powder and coal powder in a crystallization system to obtain a mixture; sending the mixture into a reverberatory furnace or a horse shoe flame furnace for temperature-controlled ignition to generate sodium silicate melt and SO2Cooling the gas and sodium silicate melt to obtain solid sodium silicate; in reverberatory or horse-shoe flame furnaces with SO2A sulfuric acid washing device is additionally arranged between the gas absorption devices, and SO is removed by acid washing2Trace SO contained in gas3(ii) a The antioxidant is one or more of methanol, ethanol, thiosulfate and hydroquinone.
2) SO produced by the burning2Absorbing the gas with sodium carbonate or sodium hydroxide solution to generate sodium sulfite, evaporating the sodium sulfite solution for crystallization, separating, drying and packaging to obtain an anhydrous sodium sulfite product; in order to prevent oxidation during absorption, antioxidant is also added into the absorbent.
3) Leaching and dissolving the solid sodium silicate obtained in the step 1) with water and steam condensate water from the white carbon black filtering and washing liquid evaporation process, precipitating and separating impurities to obtain liquid silicic acid, and diluting the liquid sodium silicate with the filtering and washing liquid from the white carbon black filtering and washing process to obtain a sodium silicate solution with the concentration meeting the process requirements.
4) Sending the sodium silicate solution with the concentration meeting the process requirement obtained in the step 3) to a white carbon black precipitation process, mixing the sodium silicate solution with dilute sulfuric acid obtained by diluting with a white carbon black filtering and washing solution to generate white carbon black precipitate, namely a white carbon black crude product, filtering and washing the white carbon black crude product to obtain a white carbon black wet product and a filtering and washing solution, mixing the white carbon black wet product with steam condensation water, namely evaporation water, obtained in a white carbon black filtering and washing solution evaporation process, pulping, and performing spray drying to obtain a white carbon black finished product.
5) Sending part of the white carbon black filtering and washing liquid obtained in the previous step to an evaporation process, and carrying out evaporative crystallization, separation and drying to obtain anhydrous sodium sulfate; returning the obtained anhydrous sodium sulfate to the sodium silicate production process to mix with quartz powder and coal powder for producing sodium silicate; the evaporation condensation water part is mixed with the wet white carbon black in the step 4) and is pulped; a portion of the solid waterglass leaching process is used as the leaching agent.
6) Sending part of the white carbon black filtrate obtained in the step 4) to a sulfuric acid dilution process and a liquid sodium silicate dilution process respectively to be used as diluents; the diluted sulfuric acid and the sodium silicate solution with the concentration meeting the technological requirements are sent to a white carbon black precipitation procedure to be used as reactants.
The first embodiment is as follows:
1000kg of sodium sulfate, 1370kg of quartz sand and 70kg of coal powder are uniformly mixed and then placed in a horse hoof flame furnace for ignition, and 1770kg of sodium silicate melt is obtained after cooling. And (3) absorbing the generated tail gas containing sulfur dioxide by using a sodium hydroxide solution to obtain a sodium sulfite solution, wherein an antioxidant used for absorption is sodium thiosulfate, and then evaporating, crystallizing, drying and packaging to obtain 900kg of anhydrous sodium sulfite product.
The water glass melt is dissolved by 3400kg of steam condensed water from the white carbon black filtering and washing liquid evaporation process, and liquid sodium silicate 5200kg is obtained through precipitation, separation and washing. Diluting liquid sodium silicate with 2000kg of white carbon black filtering and washing liquid, diluting 98% sulfuric acid with 2600kg of white carbon black filtering and washing liquid to obtain 3280kg of dilute sulfuric acid, strictly controlling technological conditions to enable the sodium silicate with the concentration meeting the requirements to react with the dilute sulfuric acid to obtain crude white carbon black, and then filtering and washing to obtain 11600kg of wet white carbon black and filtered and washed liquid with the concentration of 14%. 1700kg of steam condensate from the white carbon black filtering and washing liquid evaporation process is mixed with wet white carbon black, and 1400kg of white carbon black products are obtained after pulping and spray drying. 2000kg of filter washing liquid is used as a liquid sodium silicate diluent, 2600kg of filter washing liquid is used as a sulfuric acid diluent, and the rest 7000kg of filter washing liquid is sent to an evaporative crystallization process to be subjected to evaporative crystallization, separation and drying to obtain 980kg of anhydrous sodium sulfate. The evaporated water in the evaporation process is recovered, 5100kg of the evaporated water is obtained, and the water recovery rate is 85%.
Example two:
1000kg of sodium sulfate, 1290kg of quartz sand and 90kg of coal powder are mixed uniformly and then placed in a reverberatory furnace for ignition, and sodium silicate melt 1690kg is obtained after cooling. And (3) absorbing the generated tail gas containing sulfur dioxide by using a sodium carbonate solution to obtain a sodium bisulfite solution, wherein the antioxidant used for absorption is hydroquinone, and then neutralizing, evaporating, crystallizing, drying and packaging to obtain 880kg of anhydrous sodium sulfite product.
The water glass solution is dissolved by 2200kg of steam condensed water from the white carbon black filtering and washing liquid evaporation process, and 3900kg of liquid sodium silicate is obtained through precipitation, separation and washing. Diluting liquid sodium silicate with 3600kg of white carbon black filter washing liquid, diluting 98% sulfuric acid with 2000kg of white carbon black filter washing liquid to obtain 2660kg of dilute sulfuric acid, strictly controlling process conditions to enable the sodium silicate with the concentration meeting the requirement to react with the dilute sulfuric acid to obtain a crude white carbon black product, and then filtering and washing to obtain a wet white carbon black product and 11100kg of filter washing liquid with the concentration of 18%. 1800kg of steam condensate from the white carbon black filtering and washing liquid evaporation process is mixed with wet white carbon black, and 1280kg of white carbon black products are obtained after pulping and spray drying. 3600kg of filter washing liquid is used as a liquid sodium silicate diluent, 2000kg of filter washing liquid is used as a sulfuric acid diluent, and the rest 5500 filter washing liquid is sent to an evaporative crystallization process, and 990kg of anhydrous sodium sulfate is obtained through evaporative crystallization, separation and drying. And (3) recovering the evaporated water in the evaporation process to obtain 4000kg of evaporated water, wherein the water recovery rate is 90%.
Claims (2)
1. A white carbon black production flow based on recycling of filter washing liquid and sodium sulfate is characterized by comprising the following steps of mixing dried anhydrous sodium sulfate from a white carbon black filter washing liquid evaporative crystallization system with quartz powder and coal powder to obtain a mixture; sending the mixture into a reverberatory furnace or a horse shoe flame furnace for temperature-controlled ignition to generate sodium silicate melt and SO2Cooling the gas and sodium silicate melt to obtain solid sodium silicate; SO generated by burning2Absorbing the gas with sodium carbonate or sodium hydroxide solution to generate sodium sulfite, evaporating the sodium sulfite solution for crystallization, separating, drying and packaging to obtain an anhydrous sodium sulfite product; leaching and precipitating the solid sodium silicate obtained in the step 1) by using water and steam condensate water from a white carbon black filtering and washing liquid evaporation process, separating impurities to obtain liquid silicic acid, and diluting the liquid sodium silicate by using filtering and washing liquid from a white carbon black filtering and washing process to obtain a sodium silicate solution with the concentration meeting the process requirements;
sending the sodium silicate solution with the concentration meeting the technological requirements obtained in the step 3) to a white carbon black precipitation process, mixing the sodium silicate solution with dilute sulfuric acid obtained by diluting with a white carbon black filtering and washing solution to generate white carbon black precipitate, namely a white carbon black crude product, filtering and washing the white carbon black crude product to obtain a white carbon black wet product and a filtering and washing solution, mixing the white carbon black wet product with steam condensate, namely evaporation water, from a white carbon black filtering and washing solution evaporation process, pulping, and performing spray drying to obtain a white carbon black finished product; sending part of the white carbon black filtering and washing liquid obtained in the previous step to an evaporation process, and obtaining anhydrous sodium sulfate through evaporation crystallization, separation and drying; returning the obtained anhydrous sodium sulfate to the sodium silicate production process to mix with quartz powder and coal powder for producing sodium silicate; the evaporation condensation water part is mixed with the wet white carbon black in the step 4) and is pulped; part of the solid water glass leaching process is used as a leaching agent; respectively sending a part of the white carbon black filtrate obtained in the step 4) to a sulfuric acid dilution process and a liquid sodium silicate dilution process to be used as diluents; the diluted sulfuric acid and the sodium silicate solution with the concentration meeting the technological requirements are sent to a white carbon black precipitation procedure to be used as reactants.
2. The white carbon black production process based on the recycling of the filter washing liquid and the sodium sulfate, which is provided by claim 1, is characterized in that: in reverberatory or horse-shoe flame furnaces with SO2A sulfuric acid washing device is additionally arranged between the gas absorption devices, and SO is removed by acid washing2Trace SO contained in gas3(ii) a In order to prevent the oxidation phenomenon in the absorption process, an antioxidant is also added into the absorbent; the antioxidant is one or more of methanol, ethanol, thiosulfate and hydroquinone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010043328.7A CN111153412A (en) | 2020-01-15 | 2020-01-15 | White carbon black production flow based on filtering washing liquid and sodium sulfate cyclic utilization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010043328.7A CN111153412A (en) | 2020-01-15 | 2020-01-15 | White carbon black production flow based on filtering washing liquid and sodium sulfate cyclic utilization |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111153412A true CN111153412A (en) | 2020-05-15 |
Family
ID=70563181
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010043328.7A Pending CN111153412A (en) | 2020-01-15 | 2020-01-15 | White carbon black production flow based on filtering washing liquid and sodium sulfate cyclic utilization |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111153412A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111777077A (en) * | 2020-06-26 | 2020-10-16 | 中国轻工业长沙工程有限公司 | Clean production method of white carbon black |
| CN113371721A (en) * | 2021-07-21 | 2021-09-10 | 青岛美高集团有限公司 | Green and cyclic production method of silica gel |
| CN114436271A (en) * | 2021-12-29 | 2022-05-06 | 四川马边龙泰磷电有限责任公司 | White carbon black production process utilizing sulfur circulation |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1693194A (en) * | 2005-06-10 | 2005-11-09 | 卢元健 | Technology for producing white carbon black, sodium sulfite, sodium bisulfite by sodium sulfate method |
| US20080202387A1 (en) * | 2005-06-08 | 2008-08-28 | Yuanjian Lu | Process For Producing Silica and Sodium Sulfite With Sodium Sulfate |
| CN101811701A (en) * | 2010-04-10 | 2010-08-25 | 湖南新恒光科技有限公司 | Environment-friendly production process for preparing white carbon black and sodium sulfite by adopting sodium sulfate |
| CN102602946A (en) * | 2012-03-21 | 2012-07-25 | 陈君华 | Method for preparing high-specific-surface white carbon black by circularly utilizing waste water including sodium sulfate |
| CN103318923A (en) * | 2013-06-05 | 2013-09-25 | 福建远翔化工有限公司 | Method for recovering sodium sulfate from white carbon black mother solution |
| CN103723736A (en) * | 2013-12-25 | 2014-04-16 | 江苏久吾高科技股份有限公司 | Resource recovery method in white carbon black production process |
| CN105236429A (en) * | 2015-09-14 | 2016-01-13 | 安徽确成硅化学有限公司 | Ultrahighly-dispersed white carbon black preparation method |
| CN106276935A (en) * | 2016-07-26 | 2017-01-04 | 岳阳明科催化技术有限公司 | Waterglass co-producing white carbon black cleanly production technique |
-
2020
- 2020-01-15 CN CN202010043328.7A patent/CN111153412A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080202387A1 (en) * | 2005-06-08 | 2008-08-28 | Yuanjian Lu | Process For Producing Silica and Sodium Sulfite With Sodium Sulfate |
| CN1693194A (en) * | 2005-06-10 | 2005-11-09 | 卢元健 | Technology for producing white carbon black, sodium sulfite, sodium bisulfite by sodium sulfate method |
| CN101811701A (en) * | 2010-04-10 | 2010-08-25 | 湖南新恒光科技有限公司 | Environment-friendly production process for preparing white carbon black and sodium sulfite by adopting sodium sulfate |
| CN102602946A (en) * | 2012-03-21 | 2012-07-25 | 陈君华 | Method for preparing high-specific-surface white carbon black by circularly utilizing waste water including sodium sulfate |
| CN103318923A (en) * | 2013-06-05 | 2013-09-25 | 福建远翔化工有限公司 | Method for recovering sodium sulfate from white carbon black mother solution |
| CN103723736A (en) * | 2013-12-25 | 2014-04-16 | 江苏久吾高科技股份有限公司 | Resource recovery method in white carbon black production process |
| CN105236429A (en) * | 2015-09-14 | 2016-01-13 | 安徽确成硅化学有限公司 | Ultrahighly-dispersed white carbon black preparation method |
| CN106276935A (en) * | 2016-07-26 | 2017-01-04 | 岳阳明科催化技术有限公司 | Waterglass co-producing white carbon black cleanly production technique |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111777077A (en) * | 2020-06-26 | 2020-10-16 | 中国轻工业长沙工程有限公司 | Clean production method of white carbon black |
| CN113371721A (en) * | 2021-07-21 | 2021-09-10 | 青岛美高集团有限公司 | Green and cyclic production method of silica gel |
| CN114436271A (en) * | 2021-12-29 | 2022-05-06 | 四川马边龙泰磷电有限责任公司 | White carbon black production process utilizing sulfur circulation |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111153412A (en) | White carbon black production flow based on filtering washing liquid and sodium sulfate cyclic utilization | |
| CN102424392A (en) | Method for preparing white carbon black cogeneration nanometer calcium carbonate by integrally utilizing micro silicon powder | |
| CN103241754B (en) | Production method of high-purity aluminum oxide | |
| CN110697738A (en) | Sodium bicarbonate dry-process desulfurized fly ash recycling method | |
| CN109179457B (en) | Method for extracting lithium from electrolytic aluminum waste residues | |
| CN109455744A (en) | The method for preparing industrial level lithium carbonate using spodumene calcium and magnesium slag recycling lithium | |
| CN104498716A (en) | Energy-conserving and environment-protecting regenerated lead smelting and paper pulp cogeneration technology | |
| CN103318923A (en) | Method for recovering sodium sulfate from white carbon black mother solution | |
| CN109095578A (en) | A kind of method of oxalate precipitation method recycling power plant desulfurization wastewater calcium and magnesium | |
| CN100390061C (en) | Method for preparing anhydrous sodium sulfite using industrial by-product anhydrous sodium sulfate | |
| CN1281820A (en) | Technological process for producing aluminium salt and silicate by using coal gangue | |
| CN106044784B (en) | A kind of method using flyash production high-purity silicon dioxide | |
| CN112850722B (en) | Method for preparing white carbon black and cryolite from fluorine-containing silicon slag step by step | |
| CN105013317A (en) | Process flow for recovering high-purity magnesium sulfite by magnesium oxide flue gas desulphurization | |
| CN106636615B (en) | The mica treatment process of lithium carbonate is prepared using lepidolite | |
| CN112279277A (en) | System and method for high-end resource utilization of flue gas desulfurization by magnesium method | |
| CN108128788A (en) | A kind of method that sodium sulphate is recycled in the waste water from desulphurization denitration | |
| CN107337216A (en) | A kind of method that potassium feldspar hydro-thermal alkaline process prepares potassium hydroxide | |
| CN104603357A (en) | Method for recovering pulping chemicals and reducing the concentration of potassium and chloride therein | |
| CN103642051A (en) | Method for treating alkali absorbed sulfur dioxide waste liquid by using lignin | |
| CN216073085U (en) | Household garbage incineration fly ash recycling treatment system | |
| CN110844926A (en) | Production method of high-purity magnesium sulfite | |
| CN102989265A (en) | Treatment method of acyl chloride production tail gas | |
| CN109734106A (en) | A method of high concentration solution of sodium bisulfite is prepared using trade waste | |
| CN101274761A (en) | Method for preparing white carbon black with joint production of anhydrous sodium sulfate by precipitation method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |