CN114751666B - Method for preparing magnesium material by using waste aluminum electrolysis waste cathode carbon block as raw material - Google Patents
Method for preparing magnesium material by using waste aluminum electrolysis waste cathode carbon block as raw material Download PDFInfo
- Publication number
- CN114751666B CN114751666B CN202210448223.9A CN202210448223A CN114751666B CN 114751666 B CN114751666 B CN 114751666B CN 202210448223 A CN202210448223 A CN 202210448223A CN 114751666 B CN114751666 B CN 114751666B
- Authority
- CN
- China
- Prior art keywords
- waste cathode
- particles
- aluminum electrolysis
- waste
- slurry
- 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.)
- Active
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B9/00—Magnesium cements or similar cements
- C04B9/04—Magnesium cements containing sulfates, nitrates, phosphates or fluorides
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B9/00—Magnesium cements or similar cements
- C04B9/20—Manufacture, e.g. preparing the batches
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
- C25C3/00—Electrolytic production, recovery or refining of metals by electrolysis of melts
- C25C3/06—Electrolytic production, recovery or refining of metals by electrolysis of melts of aluminium
- C25C3/08—Cell construction, e.g. bottoms, walls, cathodes
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Structural Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Metallurgy (AREA)
- Manufacturing & Machinery (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a method for treating waste cathode carbon blocks in aluminum electrolysis, which comprises the steps of screening the waste cathode carbon blocks in particle size grades, acidifying particles with fine particle sizes, and preparing cement materials containing waste cathode magnesium oxysulfate by taking the particles in the range of coarse particle sizes as aggregates. The method does not generate high-temperature fluorine-containing flue gas and fluorine-containing wastewater in the treatment process, directly seals harmful elements in the aluminum electrolysis waste cathode carbon blocks, and uses the harmful elements in building materials, ensures no leakage of the harmful elements, and simultaneously utilizes the characteristics of the aluminum electrolysis waste cathode carbon blocks, such as light weight, carbon activity and the like as beneficial components of the building materials to realize solid waste utilization of the aluminum electrolysis waste cathode carbon blocks.
Description
Technical Field
The invention belongs to the technical field of solid waste treatment, and particularly relates to a treatment method for preparing a magnesium material by using waste aluminum electrolysis waste cathode carbon blocks as raw materials.
Background
The aluminum electrolysis waste cathode carbon block is industrial waste residue generated in the overhaul of an electrolytic cell in aluminum electrolysis production, is immersed in a large amount of electrolyte in the using process, has high fluorine content and contains trace cyanide, is listed in the national hazardous waste list, and belongs to hazardous waste. In order to solve the problems of high-temperature fluorine-containing flue gas and fluorine-containing wastewater, a series of waste cathode carbon block treatment processes mainly based on sulfating roasting are proposed, such as patents CN201910373382.5, CN200110006228.4 and the like.
The aluminum electrolysis cathode is deformed, raised and broken under the actions of molten salt and aluminum liquid, such as erosion, scouring and thermal stress, so as to generate a waste cathode carbon block. In general, about 10kg of waste cathode carbon blocks are produced per 1 ton of electrolytic aluminum, the global electrolytic aluminum yield in 2018 is 6434 ten thousand tons, and the quantity of the produced waste cathode carbon blocks is over 60 ten thousand tons, so that the quantity is huge. The aluminum electrolysis waste cathode carbon block mainly contains F, al, na, C, ca, K, li, si, N and other elements, the main phases comprise carbon with higher graphitization degree, sodium fluoride, cryolite, calcium fluoride, alumina, nepheline, metal silicon, transition state substances of the cryolite and the like, the substance composition is relatively complex, the fixed carbon content is usually more than 50%, and the heat productivity can reach 20MJ/kg. The fixed carbon content and the heat productivity of the waste cathode with short cell age are even higher, and the heat value is equivalent to that of power coal.
At present, domestic disposal methods mainly comprise stockpiling, wet method, pyrogenic method and other modes; the wet method can be divided into a flotation method, a chemical method, a flotation-chemical combination method and the like; the pyrogenic process comprises a high-temperature fluoride volatilization and carbon material preparation method, a steel, cement clinker, thermal power generation and other synergistic treatment and utilization methods, a rotary kiln cement raw material calcination production method and the like; the stacking method occupies land resources and brings potential safety hazards to the environment; although many studies have been made on the cathode disposal technology and industrialization, it is influenced by environmental policy or technical maturity, and it is not so much to realize industrial operation, for example, the chemical activity of fluoride is large, and the intercalation particle size is fine, so it is difficult to completely dissolve out fluoride by wet method; the pyrogenic process is also easy to produce fluorine-containing solid waste, a large amount of waste water is generated by secondary treatment, the requirement on the performance of equipment is high by treatment at high temperature, the treatment cost is high, and the problems of resource waste and the like are caused because the comprehensive utilization cannot be realized. The aluminum electrolysis waste cathode carbon block contains carbon, aluminum fluoride, sodium fluoride, calcium fluoride, cryolite, alumina, nepheline, cyanide and other substances. The carbon content is 50-70%, the carbon is highly graphitized, the rest of fluoride is an important component of the electrolyte, and if a reasonable treatment mode is utilized, the solid waste or harmful elements can become a recycling resource. The separation and recovery of the waste cathode carbon blocks are beneficial to the sustainable development of the electrolytic aluminum industry and can realize good economic benefit.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a method for treating aluminum electrolysis waste cathode carbon blocks.
The invention is realized by the following technical scheme:
a treatment method for preparing a magnesium material by using waste aluminum electrolysis waste cathode carbon blocks as raw materials comprises the following steps:
crushing, namely crushing the aluminum electrolysis waste cathode carbon blocks into crushed particles with the particle size of less than 50 mm;
acidifying, mixing the crushed particles with a sulfuric acid solution for acidifying, wherein the acidifying temperature is 0-30 ℃, and the acidifying time is 30-120 min, so as to obtain acidic carbon-containing slurry; the mass ratio of the sulfuric acid solution to the crushed particles is 1.7-2.5;
and mixing, namely mixing the slurry containing the acidic carbon-containing element with MgO to obtain the gel material containing the waste cathode, wherein the mass ratio of the slurry containing the acidic carbon-containing element to the MgO is 1.
The crushed waste cathode carbon block particles are less than 50mm, because the carbon content of the aluminum electrolysis waste cathode carbon block accounts for 50-70%, the larger particles can leach out surface fluoride, cyanide and the like to form slurry and a carbon block with holes after acidification, the smaller particles form slurry after acidification, the slurry (comprising slurry obtained by acidification of the large carbon block and slurry obtained by acidification of the small particles) and the particles of the carbon block with holes and MgO together form a gelled material, wherein the large carbon block is provided with holes in the process, the gelled material is filled into the holes, so that a large amount of fluoride, cyanide and the like in the center of the large carbon block are fixed in the holes and are not easy to leak out, and the strength of the solidified gel material containing the waste cathode can reach more than 50MPa due to the fact that the gelled material is filled in the holes, so that the aluminum electrolysis waste cathode carbon block has the advantage of strength as a building material.
A treatment method for preparing a magnesium material by using waste aluminum electrolysis waste cathode carbon blocks as raw materials comprises the following steps:
crushing, namely crushing the aluminum electrolysis waste cathode carbon blocks into particles with the particle size of less than 50 mm;
and (3) screening, namely screening the crushed particles into the following components: fine particles of 5mm or less, fine particles of 5 to 10mm and coarse particles of 10 to 50 mm;
acidifying, namely mixing the fine particles with a sulfuric acid solution for acidification, wherein the acidification temperature is 0-30 ℃, and the acidification time is 30-120 min, so as to obtain acidic carbon-containing slurry;
the sulfuric acid solution is sulfuric acid with the concentration of 5-30 wt%;
the mass ratio of the sulfuric acid solution to the crushed particles is 1;
mixing, namely mixing the acidic carbon-containing slurry, mgO, the fine particles and the coarse particles for 3-10 min to obtain waste cathode gel slurry;
the mass ratio of the acidic carbon-containing element slurry to the MgO to the fine particles to the coarse particles is 1 (0.5-2) to (2-5) to (3-8);
and (3) curing, namely injecting the slurry containing the waste cathode gel into a mold, curing for 3-24 hours at room temperature, demolding, and curing the demolded test piece for 14 days to obtain the building material containing the waste cathode gel.
After screening, the fine particles are acidified, so that toxic substances in the fine particles can be oxidized into non-toxic substances, and then the fine particles can be softened, so that the fine particles can better react in the slurry forming process;
coarse particles after sieving: the large particles leach fluoride, cyanide and the like on the surface layer to form slurry and a carbon block with holes after acidification, the cementing material is filled into the holes, so that a large amount of fluoride, cyanide and the like in the center of the large carbon block are fixed in the holes and are not easy to leak out, and the strength of the solidified gel material containing the waste cathode can reach more than 70MPa due to the fact that the cementing material is filled in the holes, so that the gel material containing the waste cathode is superior in strength as a building material.
The acidification process firstly oxidizes substances such as fluoride and the like to make the substances harmless, secondly, the acidified slurry contains sulfuric acid and sulfate, the sulfuric acid and the sulfate react with MgO to form a magnesium sulfate cementing material, and the cementing material has similar properties to cement and can well fix the waste cathode carbon block particles.
The screened sulfuric acid solution can respectively react with the two particles well, namely the particles can be sufficiently acidified. Because the particles need to be stirred during acidification so as to be capable of fully reacting, two kinds of particles are easy to form agglomeration or fine particles are easy to be bonded on the surface layer of the large particles without screening, and the bonded agglomerates are easy to form defects or weak points of strength in the gel material.
In the technical scheme, the mass ratio of the sulfuric acid solution to the crushed fine particles is 1.5-1.3.
In the technical scheme, the mass ratio of the sulfuric acid solution to the crushed coarse particles is 1.9-3.7.
The invention has the advantages and beneficial effects that:
the invention aims to provide a method for treating waste cathode carbon blocks in aluminum electrolysis, which is used for screening the waste cathode carbon blocks in particle size grades, acidifying particles with fine particle sizes and preparing waste cathode magnesium oxysulfate cement materials by taking the particles in the range of the coarse particle sizes as aggregates. The method does not generate high-temperature fluorine-containing flue gas and fluorine-containing wastewater in the treatment process, directly seals harmful elements in the aluminum electrolysis waste cathode carbon blocks, and uses the harmful elements in building materials, ensures no leakage of the harmful elements, and simultaneously utilizes the characteristics of the aluminum electrolysis waste cathode carbon blocks, such as light weight, carbon activity and the like as beneficial components of the building materials to realize solid waste utilization of the aluminum electrolysis waste cathode carbon blocks.
As MgO reacts with sulfuric acid and sulfate in the slurry to generate a magnesium oxysulfate cement phase which has strong mechanical property and compactness, the crushed aluminum electrolysis waste cathode carbon block can be solidified and sealed. The strength of the aluminum electrolysis waste cathode magnesium oxysulfate cement material after curing can reach more than 40MPa, the strength completely meets the requirement of the performance of building materials, and the mechanical performance of common building materials can meet more than 25 MPa.
Drawings
FIG. 1 is a schematic process flow diagram of a treatment method for preparing a magnesium material from waste aluminum electrolysis waste cathode carbon blocks used as raw materials in example 1 of the present invention.
FIG. 2 is a schematic process flow diagram of a treatment method for preparing a magnesium material by using waste aluminum electrolysis waste cathode carbon blocks as raw materials in example 2 of the invention.
For a person skilled in the art, other relevant figures can be obtained from the above figures without inventive effort.
Detailed Description
In order to make the technical solution of the present invention better understood, the technical solution of the present invention is further described below with reference to specific examples.
Example one
(1) Crushing the aluminum electrolysis waste cathode carbon blocks into particles with the particle size of less than 5 cm;
(2) sieving the crushed particles, and respectively sieving into fine particles smaller than 5mm, fine particles of 5mm-10mm and coarse particles of 10mm-50 mm;
(3) acidifying the fine particles with the particle size of less than 5mm at the temperature of 30 ℃ for 2 hours to obtain acidic slurry containing carbon elements;
a 10wt% sulfuric acid solution is adopted in the acidification process, and the mass ratio of the sulfuric acid solution to the fine particles is 1;
(4) the weight portion of the material is as follows: 1 part of slurry, 1 part of MgO and 7 parts of other particles (comprising 5mm-10mm fine particles and 10mm-50mm coarse particles which are mixed according to the weight ratio of 1 to 4) are uniformly mixed and reacted for 5min to form magnesium cementing material slurry containing a waste cathode, and the density of the prepared magnesium cementing material is 1.6-2.1 kg/cm 3 And pouring the slurry containing the waste cathode gel material into a mold, curing for 5 hours at room temperature, demolding, and maintaining the demolded test piece for 14 days to obtain the building material containing the waste cathode gel. The material can be used for building materials such as building envelopes, curbstones and the like.
The magnesium oxysulfate cement phase formed by MgO and sulfate or sulfuric acid in the system has high strength and high compactness, and the research has been carried out on utilizing magnesium cement to seal nuclear waste, so that the deadly property based on the magnesium oxysulfate cement phase can seal the waste cathode material, and the high strength based on the magnesium oxysulfate cement phase can be completely used for building materials.
The acidified waste cathode slurry and MgO in the whole raw material combination system can be understood as cement, and large-particle carbon blocks can be regarded as sand particles; the resulting product, including the waste cathode gel material, can be considered cement concrete, the product formed in the mold of the cement concrete being the final product.
Example two
(1) Crushing the aluminum electrolysis waste cathode carbon blocks into particles of 5cm-20 mm;
(2) carrying out sulfuric acid acidification on the crushed particles to obtain acidic carbon-containing element slurry and particles;
a 25wt% sulfuric acid solution is adopted in the acidification process, and the mass ratio of the sulfuric acid solution to the particles is 1;
(4) 1 part of slurry, particles and 0.5 part of MgO are uniformly mixed to prepare magnesium cementing material slurry containing the waste cathode, and 0.02 part of sawdust fiber is added into the slurry to prepare the building material, such as the waste cathode magnesium oxysulfate cement plate.
Relational terms such as "first" and "second," and the like, may be used solely to distinguish one element from another element having the same name, and do not necessarily require or imply any actual relationship or order between such elements.
The invention has been described in an illustrative manner, and it is to be understood that any simple variations, modifications or other equivalent changes which can be made by one skilled in the art without departing from the spirit of the invention fall within the scope of the invention.
Claims (3)
1. A treatment method for preparing a magnesium material by using waste aluminum electrolysis waste cathode carbon blocks as raw materials is characterized by comprising the following steps:
crushing, namely crushing the aluminum electrolysis waste cathode carbon blocks into crushed particles with the particle size of less than 50 mm;
acidifying, namely mixing the crushed particles with a sulfuric acid solution for acidification, wherein the acidification temperature is 0 to 30 ℃, and the acidification time is 30 to 120min, so as to obtain acidic carbon-containing slurry; the mass ratio of the sulfuric acid solution to the crushed particles is 1.7 to 2.5;
mixing, namely mixing the slurry containing the acidic carbon-containing element with MgO to obtain a waste cathode gel material, wherein the mass ratio of the slurry containing the acidic carbon-containing element to the MgO is 1 to 1;
the sulfuric acid solution is sulfuric acid with the concentration of 5 to 30wt%.
2. A treatment method for preparing a magnesium material by using waste aluminum electrolysis waste cathode carbon blocks as raw materials is characterized by comprising the following steps:
crushing, namely crushing the aluminum electrolysis waste cathode carbon blocks into particles with the particle size of less than 50 mm;
and (3) screening, namely screening the crushed particles into: fine particles with the particle size of less than 5mm, fine particles with the particle size of 5-10mm and coarse particles with the particle size of 10-50mm;
acidifying, namely mixing the fine particles with a sulfuric acid solution for acidification, wherein the acidification temperature is 0 to 30 ℃, and the acidification time is 30 to 120min, so as to obtain acidic carbon-containing slurry;
the sulfuric acid solution is sulfuric acid with the concentration of 5 to 30wt%;
the mass ratio of the sulfuric acid solution to the crushed particles is 1;
mixing, namely mixing the acidic carbonaceous element slurry, mgO, the fine particles and the coarse particles, and mixing for 3-10min to obtain waste cathode gel slurry;
the mass ratio of the acidic carbon-containing element slurry to the MgO to the fine particles to the coarse particles is 1 (0.5-2): (2-5): 3-8);
and (3) curing, namely injecting the slurry containing the waste cathode gel into a mold, curing for more than 3 hours at room temperature, demolding, and curing the demolded test piece for 14 days to obtain the building material containing the waste cathode gel.
3. The processing method for preparing the magnesium material by using the waste aluminum electrolysis waste cathode carbon blocks as raw materials according to claim 2, characterized in that the waste cathode gel-containing slurry is injected into a mold for curing for 3 to 24 hours at room temperature, then the mold is removed, and the demolded test piece is cured for 14 days to obtain the waste cathode gel-containing building material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210448223.9A CN114751666B (en) | 2022-04-27 | 2022-04-27 | Method for preparing magnesium material by using waste aluminum electrolysis waste cathode carbon block as raw material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210448223.9A CN114751666B (en) | 2022-04-27 | 2022-04-27 | Method for preparing magnesium material by using waste aluminum electrolysis waste cathode carbon block as raw material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114751666A CN114751666A (en) | 2022-07-15 |
| CN114751666B true CN114751666B (en) | 2023-03-10 |
Family
ID=82332769
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210448223.9A Active CN114751666B (en) | 2022-04-27 | 2022-04-27 | Method for preparing magnesium material by using waste aluminum electrolysis waste cathode carbon block as raw material |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114751666B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114535260B (en) * | 2022-02-21 | 2023-07-21 | 中国科学院青海盐湖研究所 | Treatment method and application of aluminum electrolysis waste cathode carbon block |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993025494A1 (en) * | 1992-06-12 | 1993-12-23 | Moltech Invent S.A. | Carbon masses in particular for use in aluminium production cells |
| CN107904621A (en) * | 2017-11-09 | 2018-04-13 | 北京科技大学 | A kind of regeneration treating method of waste cathode of aluminum electrolytic cell carbon block |
| CN108520790A (en) * | 2018-03-30 | 2018-09-11 | 中国科学院上海应用物理研究所 | A kind of curing of fluorine-containing radioactive liquid waste |
| CN111170299A (en) * | 2020-01-19 | 2020-05-19 | 中南大学 | Method for recovering waste cathode carbon blocks from aluminum electrolysis |
| CN112745606A (en) * | 2020-12-30 | 2021-05-04 | 郑州大学 | Rubber material based on waste cathode carbon blocks and preparation method thereof |
-
2022
- 2022-04-27 CN CN202210448223.9A patent/CN114751666B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993025494A1 (en) * | 1992-06-12 | 1993-12-23 | Moltech Invent S.A. | Carbon masses in particular for use in aluminium production cells |
| CN107904621A (en) * | 2017-11-09 | 2018-04-13 | 北京科技大学 | A kind of regeneration treating method of waste cathode of aluminum electrolytic cell carbon block |
| CN108520790A (en) * | 2018-03-30 | 2018-09-11 | 中国科学院上海应用物理研究所 | A kind of curing of fluorine-containing radioactive liquid waste |
| CN111170299A (en) * | 2020-01-19 | 2020-05-19 | 中南大学 | Method for recovering waste cathode carbon blocks from aluminum electrolysis |
| CN112745606A (en) * | 2020-12-30 | 2021-05-04 | 郑州大学 | Rubber material based on waste cathode carbon blocks and preparation method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 《铝电解废阴极中氟化物浸提实验研究》;逯军正等;《硅酸盐通报》;20080630;第27卷(第三期);第636页 * |
| 电解铝废阴极碳块资源化处理;李玉红等;《矿产综合利用》;20180825(第04期);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114751666A (en) | 2022-07-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102978659B (en) | A kind of Deep method of comprehensive utilization of electrolytic cell overhaul slag | |
| CN113896466B (en) | Red mud consolidation method based on carbonation reaction and carbonized product obtained by same | |
| CN105985075B (en) | Recycling method of cement concrete waste | |
| CN113213789B (en) | Paving brick prepared based on household garbage incineration fly ash and preparation method thereof | |
| CN108996930B (en) | Method for preparing foamed geopolymer cementing material from aluminum ash | |
| CN112079583A (en) | Building material product based on rapid carbonization of regenerated cementing material and preparation method thereof | |
| CN114751666B (en) | Method for preparing magnesium material by using waste aluminum electrolysis waste cathode carbon block as raw material | |
| CN112209676B (en) | Anti-freezing and anti-efflorescence red mud baking-free brick and preparation method thereof | |
| CN106630700A (en) | Inorganic gelling material made from coal ash and waste glass and preparation method of inorganic gelling material | |
| CN105837067A (en) | Red mud and coal ash geopolymer material formula and preparation method thereof | |
| CN116332535A (en) | Method for producing active micro powder by cooperatively treating manganese slag by using fluidized bed furnace | |
| CN104446363A (en) | Method of preparing ceramsite from manganese carbonate residues | |
| Wang et al. | Study on harmless and resources recovery treatment technology of waste cathode carbon blocks from electrolytic aluminum | |
| CN109453493A (en) | Stabilization agent and its preparation method and application for handling the waste residue containing beryllium | |
| CN109695059B (en) | Preparation method of gypsum whisker | |
| CN106495511A (en) | The technique that a kind of utilization electroplating sludge prepares Binder Materials | |
| CN105174764A (en) | Preparation method of manganese slag activate micro powder for concrete admixture | |
| CN115304333A (en) | Shield synchronous grouting material and preparation method thereof | |
| CN111606585B (en) | Superfine carbonate type tailing-based active material, preparation method thereof and application of superfine carbonate type tailing-based active material as cement material | |
| CN114535260B (en) | Treatment method and application of aluminum electrolysis waste cathode carbon block | |
| CN111825402B (en) | Recycling treatment method of phosphorus slag | |
| CN113603450A (en) | Method for treating waste incineration fly ash and condensate thereof | |
| CN112194502A (en) | High-strength concrete doped with glass slag and tailing slag and preparation method thereof | |
| CN112250265A (en) | Sludge curing agent, preparation method thereof and sludge curing and stabilizing treatment method | |
| CN109047274A (en) | A kind of method for innocent treatment of the useless carbon slag of aluminium electroloysis |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |