CN111762803A - Method for producing magnesium sulfate fertilizer by using high-temperature salt - Google Patents
Method for producing magnesium sulfate fertilizer by using high-temperature salt Download PDFInfo
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- CN111762803A CN111762803A CN202010555405.7A CN202010555405A CN111762803A CN 111762803 A CN111762803 A CN 111762803A CN 202010555405 A CN202010555405 A CN 202010555405A CN 111762803 A CN111762803 A CN 111762803A
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- magnesium sulfate
- magnesium
- temperature salt
- milk
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- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 title claims abstract description 50
- 150000003839 salts Chemical class 0.000 title claims abstract description 40
- 229910052943 magnesium sulfate Inorganic materials 0.000 title claims abstract description 25
- 235000019341 magnesium sulphate Nutrition 0.000 title claims abstract description 25
- 239000003337 fertilizer Substances 0.000 title claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000011777 magnesium Substances 0.000 claims abstract description 38
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 38
- 229940091250 magnesium supplement Drugs 0.000 claims abstract description 38
- 239000008267 milk Substances 0.000 claims abstract description 29
- 235000013336 milk Nutrition 0.000 claims abstract description 29
- 210000004080 milk Anatomy 0.000 claims abstract description 29
- LFCFXZHKDRJMNS-UHFFFAOYSA-L magnesium;sulfate;hydrate Chemical compound O.[Mg+2].[O-]S([O-])(=O)=O LFCFXZHKDRJMNS-UHFFFAOYSA-L 0.000 claims abstract description 27
- 229940076230 magnesium sulfate monohydrate Drugs 0.000 claims abstract description 26
- 229960003390 magnesium sulfate Drugs 0.000 claims abstract description 24
- 238000001035 drying Methods 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000002002 slurry Substances 0.000 claims abstract description 12
- 239000007788 liquid Substances 0.000 claims abstract description 10
- 238000005469 granulation Methods 0.000 claims abstract description 5
- 230000003179 granulation Effects 0.000 claims abstract description 5
- 238000005096 rolling process Methods 0.000 claims abstract description 5
- 238000004537 pulping Methods 0.000 claims abstract description 4
- 238000012216 screening Methods 0.000 claims abstract description 4
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 38
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 22
- 239000011780 sodium chloride Substances 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 14
- 238000000926 separation method Methods 0.000 claims description 12
- 239000001103 potassium chloride Substances 0.000 claims description 11
- 235000011164 potassium chloride Nutrition 0.000 claims description 11
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 5
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 4
- 239000008399 tap water Substances 0.000 claims description 3
- 235000020679 tap water Nutrition 0.000 claims description 3
- 239000012452 mother liquor Substances 0.000 abstract description 3
- 238000005406 washing Methods 0.000 abstract 1
- 239000000047 product Substances 0.000 description 22
- 239000000203 mixture Substances 0.000 description 8
- 241001131796 Botaurus stellaris Species 0.000 description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 5
- 238000001704 evaporation Methods 0.000 description 5
- 230000008020 evaporation Effects 0.000 description 5
- 239000011593 sulfur Substances 0.000 description 5
- 229910052717 sulfur Inorganic materials 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 239000006227 byproduct Substances 0.000 description 4
- 239000000395 magnesium oxide Substances 0.000 description 4
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 241000196324 Embryophyta Species 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 3
- PPOGESCRKNAGEU-UHFFFAOYSA-I [Cl-].[Na+].[Cl-].[K+].[Cl-].[Mg+2].S(=O)(=O)([O-])[O-].[Mg+2] Chemical compound [Cl-].[Na+].[Cl-].[K+].[Cl-].[Mg+2].S(=O)(=O)([O-])[O-].[Mg+2] PPOGESCRKNAGEU-UHFFFAOYSA-I 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 235000015097 nutrients Nutrition 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000012267 brine Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 102000004169 proteins and genes Human genes 0.000 description 2
- 108090000623 proteins and genes Proteins 0.000 description 2
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- FPIPGXGPPPQFEQ-UHFFFAOYSA-N 13-cis retinol Natural products OCC=C(C)C=CC=C(C)C=CC1=C(C)CCCC1(C)C FPIPGXGPPPQFEQ-UHFFFAOYSA-N 0.000 description 1
- 241000894006 Bacteria Species 0.000 description 1
- ZZZCUOFIHGPKAK-UHFFFAOYSA-N D-erythro-ascorbic acid Natural products OCC1OC(=O)C(O)=C1O ZZZCUOFIHGPKAK-UHFFFAOYSA-N 0.000 description 1
- 102000004190 Enzymes Human genes 0.000 description 1
- 108090000790 Enzymes Proteins 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- FPIPGXGPPPQFEQ-BOOMUCAASA-N Vitamin A Natural products OC/C=C(/C)\C=C\C=C(\C)/C=C/C1=C(C)CCCC1(C)C FPIPGXGPPPQFEQ-BOOMUCAASA-N 0.000 description 1
- 229930003268 Vitamin C Natural products 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- FPIPGXGPPPQFEQ-OVSJKPMPSA-N all-trans-retinol Chemical compound OC\C=C(/C)\C=C\C=C(/C)\C=C\C1=C(C)CCCC1(C)C FPIPGXGPPPQFEQ-OVSJKPMPSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000012824 chemical production Methods 0.000 description 1
- 229930002875 chlorophyll Natural products 0.000 description 1
- 235000019804 chlorophyll Nutrition 0.000 description 1
- ATNHDLDRLWWWCB-AENOIHSZSA-M chlorophyll a Chemical compound C1([C@@H](C(=O)OC)C(=O)C2=C3C)=C2N2C3=CC(C(CC)=C3C)=[N+]4C3=CC3=C(C=C)C(C)=C5N3[Mg-2]42[N+]2=C1[C@@H](CCC(=O)OC\C=C(/C)CCC[C@H](C)CCC[C@H](C)CCCC(C)C)[C@H](C)C2=C5 ATNHDLDRLWWWCB-AENOIHSZSA-M 0.000 description 1
- 244000038559 crop plants Species 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- WRUGWIBCXHJTDG-UHFFFAOYSA-L magnesium sulfate heptahydrate Chemical compound O.O.O.O.O.O.O.[Mg+2].[O-]S([O-])(=O)=O WRUGWIBCXHJTDG-UHFFFAOYSA-L 0.000 description 1
- 229940061634 magnesium sulfate heptahydrate Drugs 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 230000004060 metabolic process Effects 0.000 description 1
- 230000008635 plant growth Effects 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000011085 pressure filtration Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000011573 trace mineral Substances 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
- 235000019155 vitamin A Nutrition 0.000 description 1
- 239000011719 vitamin A Substances 0.000 description 1
- 235000019154 vitamin C Nutrition 0.000 description 1
- 239000011718 vitamin C Substances 0.000 description 1
- 229940045997 vitamin a Drugs 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
- C05D5/00—Fertilisers containing magnesium
-
- 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
-
- 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
- C01F5/40—Magnesium sulfates
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G5/00—Fertilisers characterised by their form
- C05G5/10—Solid or semi-solid fertilisers, e.g. powders
- C05G5/12—Granules or flakes
Abstract
A process for preparing magnesium sulfate fertilizer from high-temp salt includes such steps as preparing slurry from high-temp salt, circulating liquid, pulping, separating by cone blue centrifugal machine to obtain magnesium milk and coarse salt, and washing the coarse salt to obtain refined industrial salt. And (2) centrifugally separating the magnesium milk to obtain wet magnesium sulfate monohydrate and mother liquor, returning the mother liquor to blend high-temperature salt, firstly removing 50% of water from the wet magnesium sulfate monohydrate by using a slurry dryer, then preparing granular products by using a rolling granulator, drying the granular products by using a vibrating drying bed, and screening the dried products to obtain the products meeting the granularity requirement. The oversize is crushed and returned to granulation or sold as another product.
Description
Technical Field
The invention belongs to the technical field of comprehensive utilization of marine resources, and particularly relates to utilization of magnesium sulfate monohydrate, in particular to a process for producing powdery or granular magnesium sulfate monohydrate by carrying out separation, granulation, drying and other process steps on by-product high-temperature salt in the process of producing potassium chloride by using bittern.
Background
Magnesium is a nutrient element necessary for plant growth and an important core element consisting of chlorophyll in plants, participates in the synthesis of sugar, protein and fat, can promote the synthesis of vitamin A and vitamin C, can promote the balanced absorption of plant root systems to other nutrients, can improve the yield of crops and improve the quality of the crops.
Sulfur is a main component constituting protein and enzyme, can promote the nitrogen fixation of rhizobia and free-living nitrogen-fixing bacteria, regulate plant metabolism, increase yield, improve crop product quality, and increase cold resistance and drought resistance of crops. The sulfur nutrient is in soil
In the form of a crop plant uptake,
reach the root system by diffusion and mass flow. According to the state of trace elements in the latest cultivated land, the sulfur-deficient soil in China occupies about 40 percent of the cultivated land area.
In the production process of producing potassium chloride by using sea salt-making mother liquor (bittern), 5-7 t of high-temperature salt is produced as a byproduct in each 1t of potassium chloride production, and the high-temperature salt contains 20-40% of sodium chloride and 25-40% of magnesium sulfate. The domestic research on the separation method by utilizing the high-temperature salt is more, the separation method mainly comprises a sedimentation centrifuge separation method, a cyclone method and an overflow separation method, the separated magnesium sulfate monohydrate is subjected to pressure filtration, and the prepared filter cake is subjected to a rotary flash evaporation drying machine to obtain a magnesium sulfate monohydrate powder product. The rotary flash evaporation dryer uses flue gas as a heat source, and because the coal-fired flue gas kiln is forbidden, magnesium sulfate monohydrate cannot be dried, and all enterprises producing magnesium sulfate monohydrate by using high-temperature salt are in a production stop state at present. The high-temperature salt treatment method is to utilize low-concentration brine to dissolve the high-temperature salt and return the low-concentration brine to a salt field, so that the waste of ocean resources is caused, the utilization rate of the ocean resources is greatly reduced, the economic benefit of bittern chemical production is obviously reduced, and the situation of loss is met. Therefore, the magnesium sulfate in the marine resources is changed into the product, and the development direction of the bittern comprehensive utilization enterprises is provided.
At present, the magnesium sulfate fertilizer applied to agriculture at home and abroad mainly comprises:
(1) the magnesium sulfate heptahydrate produced by adopting a sulfuric acid method has good water solubility, high fertilizer efficiency and quick response, but the content of effective magnesium and effective sulfur is low, the content of water-soluble magnesium in the product is only 16.2 percent (calculated by MgO), the content of water-soluble sulfur is only 13.0 percent, the application amount is large, and the transportation and labor cost is high;
(2) the content of acid-soluble magnesium (calculated as MgO) in the monohydrate magnesium sulfate obtained by directly reacting a magnesium-containing raw material (such as light-burned magnesium oxide) with concentrated sulfuric acid is 28-30%, and the content of water-soluble magnesium (calculated as MgO) is as follows: 23 to 25 percent; although the method improves the content of partial water-soluble magnesium, the content of acid-soluble magnesium is still higher, the crops are not easy to directly absorb, and the produced particles need to be dried, otherwise, when the particles are mixed with nitrogen, phosphorus and potassium fertilizers, the particles are easy to deliquesce and agglomerate, so that the problems of degradation of available phosphorus and the like are solved.
(3) Taking high-temperature salt which is a byproduct in the production of potassium chloride from bittern as a raw material, and producing powdery magnesium sulfate monohydrate through separation, rotary flash evaporation and drying. The hot air required by the rotary flash evaporation is flue gas with the temperature of more than 200 ℃, the discharge temperature is high, and the energy consumption is high.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims at solving the problems in the prior art, provides a process method for preparing powdery magnesium sulfate fertilizer from magnesium milk separated from high-temperature salt, and further provides a process method for preparing granular magnesium sulfate.
The technical scheme is as follows: adding the high-temperature salt separated from the potassium chloride into circulating liquid (bittern is used for the first time) to blend and pulp, wherein the concentration is 40-55 degrees Be', and separating the high-temperature salt pulp by adopting a two-step separation method after pulping:
in the first step, a coarse screen cone blue centrifuge is used for removing most (more than or equal to 80%) sodium chloride in the high-temperature salt slurry to obtain coarse magnesium milk.
And in the second step, a fine screen cone blue centrifuge is used for removing part of sodium chloride in the crude magnesium milk to obtain the magnesium milk.
And adding tap water in a certain proportion into the magnesium milk to dissolve a small part (about 5 percent of the total sodium chloride) of the sodium chloride in the magnesium milk, and finally obtaining the qualified magnesium milk.
And (4) performing solid-liquid separation on the magnesium milk, and separating and filtering the magnesium milk by adopting a flat plate centrifuge. Obtaining the magnesium sulfate monohydrate powdery material with the moisture content of 10-20 percent.
The wet magnesium sulfate monohydrate is heated and dried into a powdery product by a slurry dryer, and the used heat source is water vapor.
Or heating and drying the wet magnesium sulfate monohydrate by a slurry dryer to remove 50 percent of water, rolling and granulating the magnesium sulfate monohydrate containing 5 to 10 percent of water, and centrifuging and rounding to prepare granular products.
Drying the granular product by a vibration drying bed, and screening the dried product to obtain the product meeting the granularity requirement. The oversize is crushed and returned to granulation or sold as another product.
The invention has the technical effects that: separating sodium chloride, magnesium sulfate and magnesium chloride in the high-temperature salt of the potassium chloride byproduct, recovering the magnesium chloride, returning the recovered magnesium chloride to a potassium chloride evaporation system, and separating the sodium chloride and the magnesium sulfate to prepare a product meeting the standard; especially, the magnesium sulfate product changes the function of the existing powdery product which is not beneficial to use, and is pressed into granular products with the grain diameter of 2-4mm, thereby greatly facilitating the use and eliminating the phenomenon of storage hardening of the powdery product.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The method of the present invention is further described below with reference to FIG. 1.
Example 1:
adding high-temperature salt separated from potassium chloride into circulating liquid to prepare pulp, and preparing mixed liquid with the concentration of 40-55 degrees Be'. Wherein the compositions of the high temperature salt and the circulating liquid are shown in Table 1.
TABLE 1 chemical composition of raw materials Table (g/l)
After pulping, separating the high-temperature salt slurry by adopting a two-step separation method:
in the first step, most (more than or equal to 80 percent of the total amount) sodium chloride in the high-temperature salt slurry is removed by using a cone-blue centrifugal machine with a 0.1mm screen to obtain crude magnesium milk.
And in the second step, a part of sodium chloride in the crude magnesium milk is removed by using a cone blue centrifuge with a fine screen of 0.05mm to obtain the magnesium milk. The removal rate of the sodium chloride is 10-15% of the total amount. The composition of the obtained magnesium milk is shown in Table 2.
TABLE 2 magnesium emulsion chemical composition table (g/l)
| Be 'concentration' | Temperature of | Magnesium sulfate | Magnesium chloride | Potassium chloride | Sodium chloride |
| 42 | 75 | 346.44 | 116.91 | 22.51 | 93.31 |
And adding tap water in a certain proportion into the magnesium milk to dissolve a small part of sodium chloride in the magnesium milk, and finally obtaining the qualified magnesium milk.
And (4) performing solid-liquid separation on the magnesium milk, and separating and filtering the magnesium milk by adopting a flat plate centrifuge. Obtaining the magnesium sulfate monohydrate powdery material with the moisture content of 12-17 percent. The composition of the obtained magnesium sulfate monohydrate powdery material is shown in Table 3.
TABLE 3 chemical composition of wet magnesium sulfate monohydrate TABLE%
| Name of material | Magnesium sulfate | Magnesium chloride | Potassium chloride | Sodium chloride | Water (W) |
| Wet magnesium sulfate | 67.71 | 1.28 | 0.26 | 1.10 | 15.9 |
The wet magnesium sulfate monohydrate is heated and dried into a powdery product by a slurry dryer, and the used heat source is water vapor.
Or heating and drying the wet magnesium sulfate monohydrate by using a slurry dryer to remove 50 percent of water to obtain the magnesium sulfate monohydrate with the water content of 6 to 8.5 percent, and rolling, granulating, centrifuging and rounding to prepare granular products.
Drying the granular product by a vibration drying bed, and screening the dried product to obtain the product meeting the granularity requirement. The composition of the obtained magnesium sulfate monohydrate powdery material is shown in Table 4. The oversize is crushed and returned to granulation or sold as another product.
TABLE 4 chemical composition of magnesium sulfate monohydrate of product TABLE%
| Name of material | Magnesium sulfate | Magnesium chloride | Potassium chloride | Sodium chloride | Water (W) |
| Wet magnesium sulfate | 81.30 | 1.54 | 0.31 | 1.32 | 1.5 |
Claims (10)
1. A method for producing a magnesium sulfate fertilizer by using high-temperature salt is characterized by comprising the following steps: the high-temperature salt separated from the potassium chloride is mixed with the circulating liquid to prepare pulp with the concentration of 40-55 degrees Be', and the high-temperature salt pulp is separated by adopting a two-step separation method after pulping,
firstly, removing most of sodium chloride in high-temperature salt slurry by using a coarse screen cone blue centrifugal machine to obtain coarse magnesium milk;
secondly, removing part of sodium chloride in the crude magnesium milk by using a fine-mesh cone blue centrifuge to obtain magnesium milk;
adding tap water in a certain proportion into the magnesium milk to dissolve a small part of sodium chloride in the magnesium milk to obtain qualified magnesium milk, and separating and filtering a magnesium sulfate monohydrate powdery material of the magnesium milk by adopting a flat centrifuge;
the wet magnesium sulfate monohydrate is heated and dried into a powdery product by a slurry dryer.
2. The method for producing a magnesium sulfate fertilizer using high temperature salt as claimed in claim 1, wherein: heating and drying the obtained wet magnesium sulfate monohydrate by using a slurry dryer to remove 50% of water to obtain magnesium sulfate monohydrate with the water content of 6% -8.5%, and preparing a granular product by rolling granulation and centrifugal rounding; drying the granular product by a vibration drying bed, and screening the dried product to obtain the product meeting the granularity requirement.
3. The method for producing a magnesium sulfate fertilizer using high temperature salt as claimed in claim 1, wherein: in the first step, most of sodium chloride removed by a coarse screen cone blue centrifuge accounts for more than or equal to 80 percent of the total amount, and the aperture of the coarse screen is 0.07-0.12 mm.
4. The method for producing a magnesium sulfate fertilizer using high temperature salt as claimed in claim 1, wherein: in the second step, the part of sodium chloride removed by a fine screen cone blue centrifuge accounts for 10 to 15 percent of the total amount, and the aperture of the fine screen is 0.01 to 0.06 mm.
5. The method for producing a magnesium sulfate fertilizer using high temperature salt as claimed in claim 1, wherein: the method comprises the following steps: the water adding amount of the residual sodium chloride in the dissolved magnesium milk is 10 to 30 percent of the total amount.
6. The method for producing a magnesium sulfate fertilizer using high temperature salt as claimed in claim 1, wherein: separating and filtering magnesium milk by a flat centrifuge to obtain a magnesium sulfate monohydrate powdery material with the moisture content of 10-20%, wherein the aperture of a filter screen of the flat centrifuge is 0.003-0.03mm, and the separation factor is more than or equal to 700.
7. The method for producing a magnesium sulfate fertilizer using high temperature salt as claimed in claim 1, wherein: the heating steam pressure of the pulp dryer for heating and drying is 0.45-0.55 MPa.
8. The method for producing a magnesium sulfate fertilizer using high temperature salt as claimed in claim 1, wherein: the aperture of the granulating rolling template is 2-4mm, and the product is round after centrifugal rounding.
9. The method for producing a magnesium sulfate fertilizer using high temperature salt as claimed in claim 1, wherein: the second step drying adopts a vibration drying bed for drying.
10. The method for producing a magnesium sulfate fertilizer using high temperature salt as claimed in claim 1, wherein: the high-temperature salt comprises the following components: 22.62g/l of sodium chloride, 33.44g/l of magnesium sulfate, 12.04g/l of magnesium chloride and 1.62g/l of potassium chloride; the circulating liquid comprises the following components: 26.52g/l of sodium chloride, 77.33g/l of magnesium sulfate, 284.92g/l of magnesium chloride and 43.92g/l of potassium chloride, and the concentration of the circulating liquid is 35.2-DEG Be'.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112591775A (en) * | 2020-12-30 | 2021-04-02 | 国投新疆罗布泊钾盐有限责任公司 | Method for extracting magnesium sulfate monohydrate and industrial salt from mixed salt of sodium chloride and magnesium sulfate |
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| US5281242A (en) * | 1991-06-10 | 1994-01-25 | Exportadora De Sal, S.A De C.V. | Method for recovering magnesium sulfate products from mixtures of epsomite and halite |
| CN1102600A (en) * | 1994-08-04 | 1995-05-17 | 中国石油天然气公司工程技术研究院 | Process and unit for separating sulfate from sodium chloride in high temp. salt |
| CN108455636A (en) * | 2018-01-29 | 2018-08-28 | 天津科技大学 | A kind of production method of magnesium sulfate monohydrate |
| CN109179460A (en) * | 2018-09-06 | 2019-01-11 | 唐安纯 | A kind of production method improveing magnesium sulfate monohydrate |
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2020
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| Publication number | Priority date | Publication date | Assignee | Title |
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