CN1986458A - Carbide residue and waste water treating process - Google Patents
Carbide residue and waste water treating process Download PDFInfo
- Publication number
- CN1986458A CN1986458A CN 200610124162 CN200610124162A CN1986458A CN 1986458 A CN1986458 A CN 1986458A CN 200610124162 CN200610124162 CN 200610124162 CN 200610124162 A CN200610124162 A CN 200610124162A CN 1986458 A CN1986458 A CN 1986458A
- Authority
- CN
- China
- Prior art keywords
- water
- carbide slag
- carbide
- acetylene
- soup compound
- 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
Landscapes
- Processing Of Solid Wastes (AREA)
Abstract
The carbide residue and waste water treating process includes the following steps: pumping carbide residue with a slurry pump from acetylene producing shop to a settler, standing and separating water and precipitate; pumping the precipitate to wet ball mill and milling into 300 mesh below slurry; pressure filtering the slurry, water washing the filter cake to eliminate soluble impurity and collecting water; treating water through adding desulfurizing agent and returning to the acetylene producing shop for reuse; and pulping the filter cake to form slurry, which may be used as slaked lime for treating acid industrial waste water or sulfur containing boiler fume, building lime paste or material for producing high quality calcium carbonate.
Description
Technical field
The present invention relates to a kind of carbide slag and wastewater treatment method thereof of acetylene gas production process, belong to the environmental protection project of carbide acetylene factory comprehensive utilization.
Background technology
Carbide slag is the by product that acetylene is made in the calcium carbide hydrolysis, is a kind of industrial waste, and the principal reaction formula of hydrolysis is: CaC
2+ 2H
2O=C
2H
2+ Ca (OH)
2, the main chemical compositions of carbide slag is Ca (OH)
2, from reaction formula, as can be seen, produce a normal C
2H
2Will produce identical normal carbide slag, generally speaking, the carbide slag slurries solid content of discharging in the wet type producer is 5%～15%, water content is 85%～95%, be in liquid state, after handling through settling pond, can become moisture 60%～70% thick liquid, according to estimates, the annual carbide slag of stacking of China just has millions of tons, not only takies a large amount of soils, and serious environment pollution, if near rivers,lakes and seas, the alkalescence of discharge can cause very big pollution.China is at present except acetylene gas factory, also have polyethylene, polyvinyl chloride factory to discharge carbide slag, producing the process of acetylene every year, 1 ton of polyvinyl chloride resin of every production, can produce the carbide slag slurries 10-15 ton of solid content 5-15% simultaneously, also discharged a large amount of waste water, more than its quantity considerably beyond the quantity of its product.Because carbide slag alkalescence is strong, and contain objectionable impurities such as sulfide,, certainly will cause serious environmental to be polluted if think little of processing to it.
The document that utilizes carbide slag of open source literature report is more at present, the carbide slag that utilizes that has is handled fluoride waste, also favourablely carry out flue gas desulfurization with carbide slag as fume desulfurizing agent, some patent documentations also disclose the method for producing light calcium carbonate from calcium carbide waste slurry, active calcium oxide, carbide of calcium.A certain amount of carbide slag is mixed in the proposition that has in coal after, can effectively stop the volatilization of sulphur content; The proposition that has utilizes carbide slag to handle fluoride waste, as phosphate fertilizer industry, glass production, organic fluorine production, electronic original part production, and plating, aluminium production etc., carbide slag treatment effect and lime method are similar; There is bibliographical information to carry out acid waste water and handles, not only can save a large amount of lime resources, and cost is lower, better effects if with the carbide slag replace lime.
Some processing below we have taken passages from retrieval and utilize the bibliographical information of carbide slag:
1, Chinese patent＜application number〉200410092434＜denomination of invention〉processing method＜applicant of utilizing the carbide slag slurry of industrial waste to produce high purity gypsum〉Taiyuan No. 1 Thermal Plant, China Guodian Corp.＜contact address〉the three sections No. 59＜summaries in Shanxi province Taiyuan city Jinci Monastery road〉the present invention relates to a kind of method of producing gypsum, refer in particular to and utilize the depleted carbide slag slurry to produce the method for high purity gypsum, be specially a kind of processing method of utilizing the carbide slag slurry production high purity gypsum of industrial waste, comprise the raw materials pretreatment process, flue gas desulfurization course, the eddy flow preferred process, dehydration.The present invention is through a large amount of experiments, utilize the impurity in the product after the physical property of gypsum has solved carbide slag slurry and desulfurization dexterously various, can't utilize ordinary method to separate to purify and then the problem of the gypsum that production purity is higher, utilize the purity of the gypsum of the method for the invention production can reach more than 90%, the purpose of both reached Waste recovery, making the best use of everything, improve quality product again, realized the double wins of economic benefits and social effect.
2, Chinese patent, title: production technique for ultramicrofine light calcium carbonate, application (patent) number: CN97107449.6, application (patent right) people: king's eyeball wild goose; Fang Yuan; Xie Kaiwen, address: No. 234 province township enterprise administrations in Jiefang Road, Guiyang City, Guizhou Province dormitory, summary: the invention discloses a kind of production technique for ultramicrofine light calcium carbonate, carbide slag or digestion lime are leached in chloride, through row NH
3, refilter the back of removing slag and add bicarbonate of ammonia, post precipitation can obtain ultramicrofine light calcium carbonate after filtration, filtrate can turn back to the leaching operation and recycle.The present invention compared with prior art, have in the technological process concentration controlled, do not have and heat up, can utilize calcium carbide waste slag advantage such as to produce as raw material, can produce the ultramicrofine light calcium carbonate product, filtrate can be recycled, so production cost is low, technology is simple, and has solved three wastes problem simultaneously; Add relevant auxiliary agent and also can make lime carbonate spherical, plate crystal.
3, Chinese patent, title: with the method application (patent) of preparing high-purity calcium oxide from calcium carbide dregs number: the CN91105486.3 applying date: 1991.08.15 apply for (patent right) people: Technology Development Service, Changzhou Aircraft Maker address: Changzhou airport, Jiangsu Province road, summary: the method that the present invention relates to a kind of usefulness preparing high-purity calcium oxide from calcium carbide dregs.Its technical characterictic is: main by the pre-treatment to carbide slag, and with pretreated carbide slag and ammonium chloride and water wiring solution-forming by a certain percentage, after filtration, the clarification back feeds carbon dioxide, carry out carbonization, through crystallization, separate washing again, dehydration, drying places after the pulverizing under 1000 ℃～1200 ℃ temperature again and is incubated 30 minutes～120 minutes, thereby makes high-purity calcium oxide.Be used for iron and steel, agricultural chemicals, medicine, non-ironworker industry, process hides laboratory ammonia drying and pure aspects such as dehydration, extensive use is arranged.Principal claim: the manufacture method of inorganic salts in a kind of chemical field, particularly a kind of method with preparing high-purity calcium oxide from calcium carbide dregs.Technical characterictic is: earlier lime carbonate (Wingdale) and hydrochloric acid reaction are generated calcium chloride, with the ammoniacal liquor neutralization, filter, add sodium bicarbonate, reaction generates precipitation of calcium carbonate, gets through dehydration, dry, calcining.Technical characterictic of the present invention is: a, carbide slag is carried out pre-treatment, promptly with carbide slag preheating oven dry under 150 ℃ to 200 ℃ temperature through dehydration, and then place under 1201 ℃ to the 1350 ℃ temperature and heat, after reaching assigned temperature, be incubated 30 minutes to 60 minutes.B, remove after the pre-treatment a large amount of impurity in the carbide slag, be about to pretreated carbide slag, by following weight ratio; Carbide slag after the pre-treatment: ammonium chloride: water=(1～1.6): 2: (6～10), wiring solution-forming is through fully stirring the after-filtration clarification.C, feed above-mentioned solution till reaction solution PH≤7 o'clock with carbon dioxide.D, through crystallization, separation, washing, dehydration, drying, pulverizing.E, the material after the drying and crushing is placed under 1000 ℃～1200 ℃ temperature, soaking time is 30 minutes to 120 minutes again.F, cooling, screening.
4, Chinese patent, title: with the method for preparing high-purity technical calcium carbonate from calcium carbide dregs, application (patent) number: the CN91105487.1 applying date: 1991.08.15 apply for (patent right) people: Technology Development Service, Changzhou Aircraft Maker address: Changzhou airport, Jiangsu Province road summary: the present invention relates to the manufacture method of a kind of inorganic salts in the chemical field, particularly a kind of method of usefulness preparing high-purity technical calcium carbonate from calcium carbide dregs.Technical characterictic of the present invention is: main by the pre-treatment to carbide slag, and with pretreated carbide slag and ammonium chloride and water wiring solution-forming by a certain percentage, after filtration, after the clarification, feed carbon dioxide and carry out carbonization, again through dehydration, washing, dry, cooling, pulverize, screening, thereby make high-purity technical calcium carbonate.The $ high-purity technical calcium carbonate has extensive use as the filler of products such as rubber, plastics, paint.Principal claim: the manufacture method of inorganic salts in a kind of chemical field, particularly a kind of method with preparing high-purity technical calcium carbonate from calcium carbide dregs.Prior art is characterized as: with the mixed aqueous solution of high-quality calcium hydroxide and ammonium chloride, feed carbon dioxide and produce high-purity technical calcium carbonate.Technical characterictic of the present invention is: a, carbide slag is carried out pre-treatment, promptly with through the carbide slag of dehydration under 150 ℃ to 200 ℃ temperature, preheating, oven dry, and then place under 1201 ℃～1350 ℃ temperature and heat, after reaching assigned temperature, be incubated 30 minutes to 60 minutes.B, remove after the pre-treatment a large amount of impurity in the carbide slag, be about to through pretreated carbide slag, by following weight ratio; Carbide slag after the pre-treatment: ammonium chloride: water=(1～1.6): 2: (6～10), wiring solution-forming is through fully stirring after-filtration, clarification.C, feed above-mentioned solution, till reaction solution≤7 o'clock with carbon dioxide.D, again through dehydration, washing, dry, cooling, pulverize, screening.
5, Chinese patent,＜application number〉88104648＜denomination of invention〉with the method＜applicant of preparation of bleaching powder from calcium carbide dregs〉Technology Development Service, Changzhou Aircraft Maker＜claim〉a kind of manufacture method of alkali metal compound, particularly a kind of method with preparation of bleaching powder from calcium carbide dregs, its step comprises: a, give processing to carbide slag; B is that water is made into＜makes a summary to give carbide slag 23% to 27% after the processing (by weight, down with), sodium hydroxide 5% to 12%, surplus〉along with acetylene industry is generally applied, carbide slag has become the urgency three wastes problem to be solved of acetylene industry.The present invention is mainly by the pre-treatment to carbide slag.And mix a certain amount of sodium hydroxide and water wiring solution-forming, feed chlorine and react, thereby obtain chlorinated lime.Make the waste residue handling problem that chlorinated lime has solved acetylene industry with carbide slag, and have tangible economic benefit.
We can recognize from above-mentioned open source literature, and the Application Areas of carbide slag is very extensive, and at present domestic a lot of acetylene enterprise has also become the environment-friendly type enterprise of comprehensive utilization gradually from heavy polluter.But owing to do not have suitable supporting raw material around a lot of enterprise; still there are many problems so handle carbide slag, the processing cost height that has, energy consumption is big; do not meet the environmental protection project of saving type; also have owing to technologic reason, can only handle tiny carbide slag, coarse particles also will be discharged into environment; administer thorough inadequately; also have, the treatment process of all document introductions all is to handle carbide slag at present, can not handle the sewage of discharging with carbide slag simultaneously.
Summary of the invention
The purpose of this invention is to provide a kind of novel method of handling carbide slag, can solve moisture height from another kind of angle, the difficult problem of alkalescence forceful electric power rock ballast, not only can all coarse particles and fine grain carbide slag be handled, and also all be used with the sewage that carbide slag is discharged, can also provide fine slaked lime (environmentally friendly and cheap treatment agent) for the enterprise of containing the acid waste water discharging.
As everyone knows, carbide of calcium is to be obtained by lime carbonate and carbon reaction, and in the process of producing carbide of calcium, the lime carbonate that has contains certain impurity, and reaction is incomplete, and the carbide of calcium volume that generates after the reaction that has is bigger, residual when acetylene is made in the calcium carbide hydrolysis have impurity and react incomplete carbide of calcium, thereby, discharge, and the alkaline waste water that can't handle always have remaining waste residue no matter take what present method and how to handle carbide slag.
The present invention thereby at the above-mentioned several aspects that exist is through research for a long time and well-designed a kind ofly can all handle the calcium carbide waste slag wastewater treatment method that acetylene gas factory and polyethylene, polyvinyl chloride factory discharge.
Carbide slag of the present invention and wastewater treatment method thereof comprise following processing step:
1, precipitation is evacuated to settling bath with the material of discharging with slush pump, leaves standstill, and the water after leaving standstill is standby, sediment separate out.
2, ball milling, method by wet ball grinding, become particle less than 300 purpose slurries the carbide slag ball milling with ball mill, the process of this ball milling can and be reacted incomplete carbide of calcium and all wear into pulpous state (open source literature is not mentioned carbide slag is carried out ball milling and carbide slag is worn into the process of particle less than 300 order slurries at present) the acetylene remaining impurities.
3, press filtration is carried out press filtration by the slurry of press filtration after with ball milling, removes soluble impurity.
4, washing is washed the filter cake in the pressure filter, further to remove soluble impurity.Described washing is to carry out in pressure filter.
5, the water with above-mentioned the first step precipitation, press filtration and washing collects, return the acetylene workshop after adding sweetening agent or scavenging agent, be reacted into the water of productive use of acetylene as carbide of calcium and water, the effect of these water of reuse also is to reclaim the acetylene that is dissolved in the water, can reduce the meltage when producing acetylene, acetylene output is improved.
6, change slurry, filter cake adds water, and by churned mechanically method filter cake is stirred into pulpous state and promptly obtain finished product, this finished product can be made into that solid weight content is the slaked lime of 30-40% in the soup compound, also can be made into the high or low soup compound of concentration (paring stone emplaster) as required.
Outstanding substantive distinguishing features of the present invention and obvious improvement are:
1, makes full use of calcium carbide waste slag, accomplished utilization of waste material, reduced environmental pollution.
2, production cost is low, and the energy is few, and production technique is simple.
3, the slaked lime granularity that obtains is little, no residue, be suitable for particularly acid waste water such as vitriol works, printing and dyeing mill processing of trade effluent, and, also be fit to architectural use as the high boiler smoke processing of sulfur-bearing, replace lime putty commonly used at present, but to use well compared with existing lime putty (calcium oxide adds the milk of lime of water preparation), present this milk of lime particle is thick, and throw out is more, needs before the use to filter.
4, made full use of the water of precipitation, press filtration and washing, and be reacted into the water of productive use of acetylene as carbide of calcium and water, the effect of these water of reuse also is to be dissolved in the meltage that acetylene in the water can reduce acetylene, makes acetylene output be improved, and the business economic benefit is also more obvious.
Embodiment
Embodiment 1, the carbide slag material that the acetylene workshop is discharged is evacuated to settling bath with slush pump, leave standstill, leave standstill the back sediment separate out, water is standby, with the throw out pump to ball mill by wet process, wear into particle less than 300 purpose slurries, deliver to the slurry of press filtration after and carry out press filtration ball milling, again the filter cake in the pressure filter is washed, further to remove soluble impurity, with above-mentioned the first step precipitation, the water of press filtration and washing collects, and returns the acetylene workshop after adding sweetening agent or scavenging agent, is reacted into the water of productive use of acetylene as carbide of calcium and water, add water at filter cake at last, the per kilogram filter cake adds water 6-7 kilogram, is put in the storage tank to preserve, as handling vitriol works, the slaked lime that acid waste waters such as printing and dyeing mill are handled.
Embodiment 2, the carbide slag material that the acetylene workshop is discharged is evacuated to settling bath with slush pump, leave standstill, leave standstill the back sediment separate out, water is standby, with the throw out pump to ball mill by wet process, wear into particle less than 300 purpose slurries, deliver to the slurry of press filtration after and carry out press filtration ball milling, again the filter cake in the pressure filter is washed, further to remove soluble impurity, with above-mentioned the first step precipitation, the water of press filtration and washing collects, and returns the acetylene workshop after adding sweetening agent or scavenging agent, is reacted into the water of productive use of acetylene as carbide of calcium and water, add water at filter cake at last, the per kilogram filter cake adds water 2-5 kilogram, is put in the storage tank to preserve, as the paring stone emplaster.
Embodiment 3, the carbide slag material that the acetylene workshop is discharged is evacuated to settling bath with slush pump, leave standstill, leave standstill the back sediment separate out, water is standby, with the throw out pump to ball mill by wet process, wear into particle less than 300 purpose slurries, deliver to the slurry of press filtration after and carry out press filtration ball milling, again the filter cake in the pressure filter is washed, further to remove soluble impurity, with above-mentioned the first step precipitation, the water of press filtration and washing collects, return the acetylene workshop after adding sweetening agent or scavenging agent, be reacted into the water of productive use of acetylene as carbide of calcium and water, filter cake is added less water, feed carbonic acid gas, make high-quality lime carbonate, this high-quality lime carbonate fineness is good, can be used for a lot of occasions, and is more cheap compared with directly roughly grinding cost with Wingdale.
The present invention tried out in Guangxi carbide acetylene factory in October, 2006-November, waste sludge discharge and quantity of wastewater effluent have been 0, the acetylene gas Workshop Production ability of producing is constant, the acetylene rate ratio improved 2-5% (having reclaimed the acetylene that is dissolved in the waste water) with tap water as water of productive use originally, the slaked lime of output and paring stone emplaster are subjected to liking of user very much, and supply falls short of demand.
Claims (4)
1, a kind of carbide slag and wastewater treatment method thereof, it is characterized in that: the carbide slag material that the acetylene workshop is discharged is evacuated to settling bath with slush pump earlier, leave standstill, leave standstill the back sediment separate out, water is standby, with the throw out pump to ball mill by wet process, wear into particle less than 300 purpose slurries, deliver to the slurry of pressure filter after and carry out press filtration, again the filter cake in the pressure filter is washed, remove soluble impurity ball milling, with above-mentioned precipitation, the water of press filtration and washing collects, return the acetylene workshop after adding sweetening agent or scavenging agent, be reacted into the water of productive use of acetylene, add water at filter cake at last and make soup compound as carbide of calcium and water.
2, the purposes of the soup compound product that obtains of a kind of carbide slag as claimed in claim 1 and wastewater treatment method thereof is characterized in that the application of the slaked lime that this soup compound is handled as acidic industrial effluent or the high boiler smoke of sulfur-bearing.
3, the purposes of the soup compound product that obtains of a kind of carbide slag as claimed in claim 1 and wastewater treatment method thereof is characterized in that the application of this soup compound as the paring stone emplaster.
4, the purposes of the soup compound product that obtains of a kind of carbide slag as claimed in claim 1 and wastewater treatment method thereof is characterized in that the application of this soup compound as the raw material of making high-quality lime carbonate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610124162 CN1986458A (en) | 2006-12-12 | 2006-12-12 | Carbide residue and waste water treating process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610124162 CN1986458A (en) | 2006-12-12 | 2006-12-12 | Carbide residue and waste water treating process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1986458A true CN1986458A (en) | 2007-06-27 |
Family
ID=38183419
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200610124162 Pending CN1986458A (en) | 2006-12-12 | 2006-12-12 | Carbide residue and waste water treating process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1986458A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101157471B (en) * | 2007-09-29 | 2010-12-01 | 株洲化工集团诚信有限公司 | Method and device for producing calcium lime by carbide slag |
| CN105948312A (en) * | 2016-05-23 | 2016-09-21 | 武汉工程大学 | Technical method for CPE wastewater treatment |
| CN106311719A (en) * | 2016-08-22 | 2017-01-11 | 四川龙蟒钛业股份有限公司 | Recycling method for carbide slag |
| CN109331636A (en) * | 2018-11-23 | 2019-02-15 | 宜宾海丰和锐有限公司 | A kind of preprocess method of desulfurizing agent carbide slag |
| CN109603498A (en) * | 2018-12-04 | 2019-04-12 | 安徽华塑股份有限公司 | A kind of technique of acetylene sludge-gypsum process flue gas desulfurization |
| CN111398091A (en) * | 2020-03-05 | 2020-07-10 | 柳州钢铁股份有限公司 | Analysis method for determining calcium carbide in composite silicon carbide deoxidizer for steelmaking |
| CN113321187A (en) * | 2021-05-24 | 2021-08-31 | 中国成达工程有限公司 | Method and system for producing bleaching powder by using wet-process acetylene waste calcium carbide slurry |
| CN113908619A (en) * | 2021-09-24 | 2022-01-11 | 清远市博发环保科技有限公司 | Production method and device for preparing liquid environment-friendly alkali from carbide slag |
| CN114210192A (en) * | 2021-12-17 | 2022-03-22 | 安徽华塑股份有限公司 | Process for preparing high-efficiency desulfurizer and byproduct active calcium oxide by using carbide slag |
| CN115259990A (en) * | 2022-06-24 | 2022-11-01 | 榆林学院 | Method and system for recycling waste heat and emission in acetylene production by calcium carbide method |
-
2006
- 2006-12-12 CN CN 200610124162 patent/CN1986458A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101157471B (en) * | 2007-09-29 | 2010-12-01 | 株洲化工集团诚信有限公司 | Method and device for producing calcium lime by carbide slag |
| CN105948312A (en) * | 2016-05-23 | 2016-09-21 | 武汉工程大学 | Technical method for CPE wastewater treatment |
| CN106311719A (en) * | 2016-08-22 | 2017-01-11 | 四川龙蟒钛业股份有限公司 | Recycling method for carbide slag |
| CN109331636A (en) * | 2018-11-23 | 2019-02-15 | 宜宾海丰和锐有限公司 | A kind of preprocess method of desulfurizing agent carbide slag |
| CN109603498A (en) * | 2018-12-04 | 2019-04-12 | 安徽华塑股份有限公司 | A kind of technique of acetylene sludge-gypsum process flue gas desulfurization |
| CN111398091A (en) * | 2020-03-05 | 2020-07-10 | 柳州钢铁股份有限公司 | Analysis method for determining calcium carbide in composite silicon carbide deoxidizer for steelmaking |
| CN113321187A (en) * | 2021-05-24 | 2021-08-31 | 中国成达工程有限公司 | Method and system for producing bleaching powder by using wet-process acetylene waste calcium carbide slurry |
| CN113321187B (en) * | 2021-05-24 | 2023-03-31 | 中国成达工程有限公司 | Method for producing bleaching powder by using wet-process acetylene waste calcium carbide slag slurry |
| CN113908619A (en) * | 2021-09-24 | 2022-01-11 | 清远市博发环保科技有限公司 | Production method and device for preparing liquid environment-friendly alkali from carbide slag |
| CN113908619B (en) * | 2021-09-24 | 2023-03-31 | 清远市博发环保科技有限公司 | Production method and device for preparing liquid environment-friendly alkali from carbide slag |
| CN114210192A (en) * | 2021-12-17 | 2022-03-22 | 安徽华塑股份有限公司 | Process for preparing high-efficiency desulfurizer and byproduct active calcium oxide by using carbide slag |
| CN115259990A (en) * | 2022-06-24 | 2022-11-01 | 榆林学院 | Method and system for recycling waste heat and emission in acetylene production by calcium carbide method |
| CN115259990B (en) * | 2022-06-24 | 2023-11-21 | 榆林学院 | Method and system for recycling waste heat and emissions in acetylene production by calcium carbide method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1986458A (en) | Carbide residue and waste water treating process | |
| CN101391794B (en) | Novel method for preparing light calcium carbonate by recovering solid white slime through alkaline pulping | |
| CN105129822B (en) | System and method for treating chlor-alkali production byproduct salt mud | |
| CN102633399A (en) | Comprehensive treatment and resource utilization technology of 2-naphthol production wastewater | |
| CN111233019A (en) | Environment-friendly treatment method for waste cathode and aluminum ash of aluminum electrolysis cell | |
| CN101186408A (en) | Method for removing ammonia and nitrogen in garbage percolate | |
| CN108217700B (en) | System and method for preparing battery-grade lithium carbonate | |
| CN110747329B (en) | Electrolytic manganese dioxide production method based on bagasse papermaking white mud | |
| CN112759143A (en) | Device and process for preparing high-molecular aluminum salt coagulant by utilizing high-salinity wastewater zero-discharge system sludge | |
| CN102161495A (en) | Method for recycling soda waste mud from soda plant | |
| CN102515234A (en) | Method for producing low-iron aluminum sulfate and polymeric aluminum ferric sulfate by using coal gangue | |
| CN109809540B (en) | Polysilicate aluminum ferric flocculant and preparation method thereof | |
| CN102587187A (en) | Alkali recovery method for by-producing activated carbon and white carbon black by using paper making black liquid | |
| CN110317962A (en) | Manganese Wet-smelting method and manganese hydrometallurgy system | |
| CN102424403A (en) | Removal of calcium and magnesium in anhydrous sodium sulfate flue gas and continuous feeding method | |
| CN101723432A (en) | Method for recycling salt slurry | |
| CN104402271A (en) | Denuded particle crystal seed modification method for utilizing sludge in dry-process rotary kiln | |
| CN102153127B (en) | Method for preparing gypsum by removing sulfate radicals from mineral salts with waste distillation liquid from ammonia alkali factory | |
| CN111547886A (en) | Coal mine wastewater recycling comprehensive treatment system | |
| CN111484081A (en) | Method for preparing manganese carbonate, ammonium sulfate and dry powder building coating by using electrolytic manganese leaching residues | |
| CN105502454B (en) | Method for preparing high-purity aluminum sulfate from industrial sludge and scrap in aluminum material factory through resource utilization | |
| CN102795701A (en) | Method for treating acidic waste water from titanium dioxide preparation by sulfuric acid method | |
| CN216891247U (en) | Zero discharge system of chlor-alkali device | |
| CN202131116U (en) | Equipment for producing calcium chloride containing impurity liquid by using wastewater | |
| CN113461304B (en) | Red mud-based mixed acid chemical conditioner special for deep dehydration of dehydrated sludge and use method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |