CN111547747A - Process for producing potassium nitrate by using brine as raw material - Google Patents
Process for producing potassium nitrate by using brine as raw material Download PDFInfo
- Publication number
- CN111547747A CN111547747A CN202010412299.7A CN202010412299A CN111547747A CN 111547747 A CN111547747 A CN 111547747A CN 202010412299 A CN202010412299 A CN 202010412299A CN 111547747 A CN111547747 A CN 111547747A
- Authority
- CN
- China
- Prior art keywords
- brine
- potassium nitrate
- potassium
- nitrate
- chloride
- 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.)
- Withdrawn
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D9/00—Nitrates of sodium, potassium or alkali metals in general
- C01D9/08—Preparation by double decomposition
- C01D9/12—Preparation by double decomposition with nitrates or magnesium, calcium, strontium, or barium
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K33/00—Medicinal preparations containing inorganic active ingredients
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D3/00—Halides of sodium, potassium or alkali metals in general
- C01D3/04—Chlorides
- C01D3/06—Preparation by working up brines; seawater or spent lyes
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D3/00—Halides of sodium, potassium or alkali metals in general
- C01D3/14—Purification
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/46—Sulfates
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F5/00—Compounds of magnesium
- C01F5/26—Magnesium halides
- C01F5/30—Chlorides
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C1/00—Ingredients generally applicable to manufacture of glasses, glazes, or vitreous enamels
-
- 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
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
-
- C—CHEMISTRY; METALLURGY
- C06—EXPLOSIVES; MATCHES
- C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
- C06B31/00—Compositions containing an inorganic nitrogen-oxygen salt
- C06B31/02—Compositions containing an inorganic nitrogen-oxygen salt the salt being an alkali metal or an alkaline earth metal nitrate
Abstract
The invention relates to a process for producing potassium nitrate by using brine as a raw material, belonging to the field of brine resource utilization. The potassium in the brine is converted into potassium nitrate with high added value, and various substances contained in the brine are comprehensively utilized, so that resources are saved, and higher economic benefit is generated.
Description
Technical Field
The invention belongs to the field of brine resource utilization, and particularly relates to a preparation process for producing potassium nitrate by using brine as a raw material.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
Potassium nitrate is an important inorganic chemical raw material, and is mainly used for manufacturing black powder, matches, glass products, photon glass, ceramic products and medicines.
Potassium nitrate is an important binary potassium fertilizer in agriculture, contains 13.5-13.9% of nitro nitrogen and 44.6-46% of potassium oxide, and during the growth period of tobacco and tea, potassium nitrate is used to replace potassium sulfate, so that the sulfur content of tobacco and tea can be reduced, and the taste of tobacco and tea can be improved. Potassium nitrate has high solubility in water and is not easy to volatilize, so that the potassium nitrate is the best ingredient for liquid fertilizers. After fertilization, the potassium nitrate can be completely absorbed by plants, and chemical residues can not be brought to the ecological environment.
With the development of society and the improvement of the living standard of people's material culture, the requirement for material is continuously expanded, and land resources are less and less. The ocean covers two thirds of the earth, contains rich elements required by people for life, taking potassium as an example, and according to statistics, the potassium dissolved in seawater is about 600 trillion tons, so that the ocean is an inexhaustible resource, and is a non-negligible resource for countries lacking soluble potassium mineral salts. China is a large population country, a large agricultural country and a potassium-deficient country, so that potassium extraction from seawater is one of the ways to solve potassium deficiency. The total amount of potassium in seawater is huge, but the content is low, and the average content is only 0.33%. Although the potassium content of brine obtained after sun-drying salt is improved, other components are correspondingly improved to form a complex system, and the separation of all substances is very difficult, so that the inventor finds that: for a long time, due to the technical difficulty of brine utilization, economic benefits are not produced, brine obtained after sodium chloride is extracted from seawater in various salt farms is discharged into the sea, and serious damage is caused to offshore marine ecology in the years.
Disclosure of Invention
In order to overcome the problems, the invention provides a process for preparing potassium nitrate by taking brine as a raw material. The potassium in the brine is converted into potassium nitrate with high added value, and various substances contained in the brine are comprehensively utilized, so that resources are saved, and higher economic benefit is generated.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
the invention provides a process for producing potassium nitrate by using brine as a raw material, which comprises the following steps:
adding calcium nitrate into the brine, and reacting to generate calcium sulfate and magnesium nitrate;
filtering and washing calcium sulfate to produce alpha-gypsum, concentrating and crystallizing the filtrate to separate out sodium chloride, adding potassium chloride into the filtrate after the sodium chloride is filtered, uniformly mixing, cooling and crystallizing to separate out potassium nitrate, concentrating and cooling the filtrate after the potassium nitrate is filtered to separate out magnesium chloride hexahydrate.
The inventor has made a major breakthrough in the technology of brine resource utilization through years of research and customs, and by adding calcium nitrate into brine resources, the dissolution balance of substances in the brine is broken, so that not only is low-cost potassium nitrate obtained, but also useful substances such as sodium chloride, magnesium chloride hexahydrate and the like are separated from the brine, and the brine which originally has a destructive effect on marine ecology is utilized.
In a second aspect of the present invention there is provided potassium nitrate prepared by any one of the above processes.
The method not only converts potassium in the brine into potassium nitrate with high added value, but also comprehensively utilizes various substances contained in the brine, saves resources and generates higher economic benefit.
In a third aspect of the invention, the potassium nitrate is applied to the manufacture of black powder, matches, glass products, photon glass, ceramic products and medicines.
The method effectively solves the problem of high added value conversion of potassium in the brine, saves resources, has good economic benefit, and realizes industrial production, thereby meeting the requirements of raw materials such as black powder, matches, glass products, photon glass, ceramic products, medicines and the like.
The invention has the beneficial effects that:
(1) the method not only converts potassium in the brine into potassium nitrate with high added value, but also comprehensively utilizes various substances contained in the brine, saves resources and generates higher economic benefit.
(2) The method is simple, low in cost, strong in practicability and easy to popularize.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The invention provides a process for preparing potassium nitrate by taking brine as a raw material, which comprises the following steps: the sulfuric acid in the brine is precipitated with calcium nitrate and magnesium nitrate is formed.
Ca(NO3)2+MgSO4→CaSO4↓+Mg(NO3)2
Magnesium nitrate and potassium chloride are subjected to double decomposition reaction to generate potassium nitrate
Mg(NO3)2+2KCl→MgCl2+2KNO3
Filtering and separating the filtrate of calcium sulfate, concentrating to the liquid temperature of 110-125 ℃, crystallizing sodium chloride (more than 98 percent of sodium chloride in brine is crystallized out), and washing the crystallized sodium chloride with water to obtain the sodium chloride with the content of more than 98 percent.
And (3) supplementing potassium chloride into the filtrate after the sodium chloride is crystallized, wherein the quantity of the supplemented potassium chloride is 2 times of the molar quantity of the calcium nitrate, and the quantity of the potassium chloride in the brine is reduced. After fully stirring, carrying out double decomposition reaction on potassium chloride and generated magnesium nitrate to generate potassium nitrate:
2KCl+Mg(NO3)2→2KNO3+MgCl2
cooling the reaction liquid to 0-20 deg.c to crystallize and separate out potassium nitrate, centrifuging, water washing and stoving to obtain potassium nitrate with potassium nitrate content over 98%.
Concentrating the filtrate after centrifuging potassium nitrate to liquid temperature of 135-155 ℃, transferring the concentrated liquid to a cooling crystallization kettle for vacuum cooling crystallization, keeping the temperature until the liquid temperature is 65-85 ℃, centrifugally filtering magnesium chloride hexahydrate after crystallization is complete, washing the magnesium chloride hexahydrate after centrifugation with water, wherein the content of magnesium chloride can reach 45-46%, and mechanically applying the filtrate of the magnesium chloride hexahydrate to concentration and one-step crystallization to produce potassium nitrate.
In order to improve the utilization rate of potassium chloride in the brine, after magnesium hydroxide and magnesium oxide are extracted from the brine, the potassium chloride content can be improved to be more than 60kg per cubic volume of the brine, the potassium chloride supplementing amount is reduced, the utilization rate of potassium chloride in the brine is improved, and the cost is reduced.
A process for producing potassium nitrate by using brine as a raw material comprises the following production steps:
adding calcium nitrate into brine, filtering the generated calcium sulfate, and using the calcium sulfate water washing sleeve into the brine of the next batch.
Filtering the filtrate of the calcium sulfate, evaporating and concentrating the filtrate in multiple effects to the liquid temperature of 110-125 ℃, crystallizing out sodium chloride, and recycling the sodium chloride washing water to the next batch of filtrate for concentration.
Filtering the filtrate, adding potassium chloride while the filtrate is hot, fully stirring, cooling to-20 deg.C to-5 deg.C, and crystallizing to obtain potassium nitrate. The potassium nitrate water washing sleeve is used for next multi-effect evaporation crystallization of sodium chloride.
Concentrating the filtrate after filtering potassium nitrate to liquid temperature of 135-155 ℃, cooling the concentrated solution to 70-85 ℃, crystallizing to separate magnesium chloride hexahydrate, and sleeving the filtrate on next crystallization to produce potassium nitrate.
In some embodiments, calcium nitrate is added to the brine in an amount equimolar to the amount of magnesium sulfate in the brine to precipitate the sulfuric acid from the brine with the calcium nitrate and form magnesium nitrate.
In some embodiments, the calcium sulfate is filtered and the crystalline sodium chloride is concentrated to a concentrate temperature of 110 ℃ to 125 ℃ to increase the crystallization efficiency.
In some embodiments, potassium chloride is added in an amount that is 2 times the moles of magnesium sulfate in the brine minus the amount of potassium chloride contained in the brine, such that potassium chloride undergoes a metathesis reaction with the magnesium nitrate produced to produce potassium nitrate.
In some embodiments, the potassium nitrate crystallization temperature is from-20 ℃ to-5 ℃ to effectively separate the potassium nitrate.
In some embodiments, the mother liquor after potassium nitrate production is concentrated to the liquid temperature of 135-155 ℃, and then cooled to 65-85 ℃ to crystallize and produce magnesium chloride hexahydrate.
The present invention is described in further detail below with reference to specific examples, which are intended to be illustrative of the invention and not limiting.
Example 1
1000 parts of brine (containing 75 parts of magnesium sulfate, 140 parts of magnesium chloride, 20 parts of potassium chloride and 75 parts of sodium chloride) is added into 170 parts of calcium nitrate solution (with the content of 60 percent), and the mixture is fully stirred and filtered. 182 parts of filter cake are obtained. And washing the filter cake with water to produce gypsum. Concentrating the filtrate to 118 ℃, crystallizing and separating out sodium chloride, centrifuging to obtain a sodium chloride filter cake, washing with water, filtering, and drying to obtain 71 parts of sodium chloride with the content of 98.3%, adding 73 parts of potassium chloride into the hot filtrate, fully stirring, cooling to-15 ℃, separating out potassium nitrate, centrifuging, washing with water, and drying to obtain 107 parts of potassium nitrate (with the content of 98.6%). And concentrating the filtrate after potassium nitrate centrifugation to the liquid temperature of 146 ℃, cooling to 75 ℃, crystallizing and separating out magnesium chloride hexahydrate, centrifuging, filtering, washing with water, and drying to obtain 328 parts of magnesium chloride hexahydrate (the content of magnesium chloride is 45.3%).
Example 2:
adding 1000 parts of brine (containing 75 parts of magnesium sulfate, 140 parts of magnesium chloride and 20 parts of potassium chloride) into the last washing water of calcium sulfate and potassium nitrate, adding 170 parts of calcium nitrate solution (with the content of 60%) while stirring, fully stirring and filtering to obtain 189 parts of filter cake, washing the filter cake with water to produce gypsum, concentrating the filtrate to the liquid temperature of 116 ℃, crystallizing and separating out sodium chloride, centrifuging, washing with water, drying to obtain 74 parts of sodium chloride with the content of 98.3%, adding 73 parts of potassium chloride and the filtrate of the last batch of crystallized magnesium chloride, cooling to-18 ℃ while fully stirring, separating out potassium nitrate, centrifuging, washing with water and drying to obtain 119 parts (content: 98.4%) of potassium nitrate, adding the magnesium chloride hexahydrate washing water into the filtrate after potassium nitrate centrifugation, concentrating to liquid temperature of 142 ℃, cooling to 80 ℃, crystallizing and separating out the magnesium chloride hexahydrate, centrifuging, filtering, washing with water and drying to obtain 415 parts (content: 45.6%) of magnesium chloride hexahydrate.
Example 3:
mixing the solution obtained by extracting magnesium salt from brine and concentrating and crystallizing sodium chloride with brine to obtain 1000 parts of new brine (containing 50 parts of magnesium sulfate, 100 parts of magnesium chloride, 95 parts of sodium chloride and 54 parts of potassium chloride), adding 114 parts of calcium sulfate and potassium nitrate solution (with the content of 60%) while stirring, fully stirring and filtering to obtain 128 parts of filter cake, washing the filter cake with water to produce alpha-gypsum, concentrating the filtrate to the liquid temperature of 114 ℃, precipitating sodium chloride crystals, centrifuging, washing with water, drying to obtain 92 parts of sodium chloride (with the content of 98.2%), adding 8 parts of potassium chloride and the filtrate obtained by crystallizing the magnesium chloride hexahydrate while the filtrate is hot, stirring and cooling to-18 ℃, precipitating potassium nitrate, centrifuging, washing with water, drying to obtain 82 parts of potassium nitrate (with the content of 98.8%), adding the filtrate obtained by centrifuging, washing with the magnesium chloride hexahydrate, concentrating to the liquid temperature of 145 ℃, cooling to 78 ℃, crystallizing and separating out magnesium chloride hexahydrate, centrifuging, washing with water, and drying to obtain 292 parts of magnesium chloride hexahydrate (the content of magnesium chloride is 45.1%).
It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and the present invention is not limited thereto, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and equivalents can be made in the technical solutions described in the foregoing embodiments, or equivalents thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. Although the present invention has been described with reference to the specific embodiments, it should be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A process for producing potassium nitrate by using brine as a raw material is characterized by comprising the following steps:
adding calcium nitrate into the brine, and reacting to generate calcium sulfate and magnesium nitrate;
filtering and washing calcium sulfate to produce alpha-gypsum, concentrating and crystallizing the filtrate to separate out sodium chloride, adding potassium chloride into the filtrate after the sodium chloride is filtered, uniformly mixing, cooling and crystallizing to separate out potassium nitrate, concentrating and cooling the filtrate after the potassium nitrate is filtered to separate out magnesium chloride hexahydrate.
2. The process for producing potassium nitrate from brine as claimed in claim 1, wherein the water used for washing the calcium sulfate is transferred to the brine of the next batch.
3. The process for preparing potassium nitrate from brine as claimed in claim 1, wherein the amount of calcium nitrate added to the brine is equal to the amount of magnesium sulfate added to the brine.
4. The process for producing potassium nitrate by using brine as a raw material according to claim 1, wherein the temperature of concentrated crystallization is 110-125 ℃.
5. The process for producing potassium nitrate by using brine as a raw material according to claim 1, wherein the temperature is reduced to-20 ℃ to-5 ℃.
6. The process for preparing potassium nitrate from brine as claimed in claim 1, wherein the amount of potassium chloride added is 2 times the molar amount of magnesium sulfate in the brine, less than the amount of potassium chloride contained in the brine.
7. The process for producing potassium nitrate from brine as claimed in claim 1, wherein the water used to wash the potassium nitrate is used to crystallize sodium chloride by multi-effect evaporation the next time.
8. The process for producing potassium nitrate by using brine as a raw material according to claim 1, wherein the concentration and temperature reduction comprises the following specific steps: concentrating to 135-155 deg.C, and cooling to 70-85 deg.C.
9. Potassium nitrate produced by the process of any one of claims 1 to 8.
10. Use of potassium nitrate as claimed in claim 9 in the manufacture of black powder, matches, glass articles, photonic glass, ceramic articles, pharmaceuticals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010412299.7A CN111547747A (en) | 2020-05-15 | 2020-05-15 | Process for producing potassium nitrate by using brine as raw material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010412299.7A CN111547747A (en) | 2020-05-15 | 2020-05-15 | Process for producing potassium nitrate by using brine as raw material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111547747A true CN111547747A (en) | 2020-08-18 |
Family
ID=71996591
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010412299.7A Withdrawn CN111547747A (en) | 2020-05-15 | 2020-05-15 | Process for producing potassium nitrate by using brine as raw material |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111547747A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114873614A (en) * | 2022-06-10 | 2022-08-09 | 山西金兰化工股份有限公司 | Method for preparing potassium nitrate and by-producing potassium carnallite and magnesium chloride |
-
2020
- 2020-05-15 CN CN202010412299.7A patent/CN111547747A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114873614A (en) * | 2022-06-10 | 2022-08-09 | 山西金兰化工股份有限公司 | Method for preparing potassium nitrate and by-producing potassium carnallite and magnesium chloride |
| CN114873614B (en) * | 2022-06-10 | 2024-01-26 | 山西金兰化工股份有限公司 | Method for preparing potassium nitrate byproduct potassium carnallite and magnesium chloride |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR20150010704A (en) | Selective extraction of potassium chloride from schoenite end liquor employing tartaric acid as safe, benign and recyclable extractant | |
| CN103420401A (en) | Method for preparing large-particle picromerite | |
| CN104211485B (en) | The method for producing crystalloid potassium dihydrogen phosphate and potassium nitrate a great number of elements Water soluble fertilizer | |
| CN108862335B (en) | Method for preparing lithium carbonate from lithium phosphate | |
| CN112551554A (en) | Treatment method of sulfur-containing waste salt and solution thereof | |
| US8158098B2 (en) | Processes for preparation of compositions comprising potassium chloride | |
| FI127782B (en) | Method of Producing Lithium Metal Phosphates | |
| CN100532260C (en) | Vacuum crystallization technique for producing potassium nitrate from potassium chloride by sodium nitrate | |
| CN103011122A (en) | Method for producing water-soluble potassium ammonium phosphate from wet-process phosphoric acid | |
| CN111547747A (en) | Process for producing potassium nitrate by using brine as raw material | |
| CN114988380A (en) | Method for producing food-grade monopotassium phosphate and co-producing high-purity gypsum by using feed-grade calcium hydrophosphate | |
| CN105712388B (en) | Nitro-compound fertilizer and industrial potassium nitrate coproduction method | |
| CN1456505A (en) | Method for preparing lithium compound from lithium metasilicate mixed salt | |
| AU2010264080A2 (en) | Process for production of commercial quality potassium nitrate from polyhalite | |
| CN1736870A (en) | Method for preparing potassium nitrate using nitric acid conversion methdo | |
| CN104386664B (en) | The method of ammonium potassium dihydrogen phosphate produced by fertilizer grade primary ammonium phosphate | |
| CN103159195A (en) | Method for preparing potassium dihydrogen phosphate from low-concentration wet-process phosphoric acid | |
| CN109534369A (en) | A kind of film is integrated to prepare lithium chloride device and method thereof | |
| CN104086396A (en) | Shell-source citric acid complexed calcium product and preparation method | |
| KR940000810B1 (en) | Process for the preparation of crystallized glutamic acid | |
| CN108117054A (en) | A kind of method for preparing potassium dihydrogen phosphate coproduction ammonium potassium dihydrogen phosphate | |
| CN103803586B (en) | Production method of potassium sulfate in subsection way | |
| CN107792866B (en) | A kind of method of potassium alum mixed solvent double decomposition production potassium sulfate and aluminium chloride | |
| CN106892442B (en) | A kind of method of potassium alum pressurization double decomposition production potassium sulfate and aluminium chloride | |
| CN107540415B (en) | Method for preparing potash magnesium sulphate fertilizer by using potassium chloride and picromerite |
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 | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20200818 |