CN105523813A - Method for preparing NPK compound fertilizer from potash salt slurry - Google Patents
Method for preparing NPK compound fertilizer from potash salt slurry Download PDFInfo
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- CN105523813A CN105523813A CN201610068475.3A CN201610068475A CN105523813A CN 105523813 A CN105523813 A CN 105523813A CN 201610068475 A CN201610068475 A CN 201610068475A CN 105523813 A CN105523813 A CN 105523813A
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- potassium sulfate
- potash
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
- C05D1/00—Fertilisers containing potassium
- C05D1/02—Manufacture from potassium chloride or sulfate or double or mixed salts thereof
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Abstract
The invention discloses a method for preparing NPK compound fertilizer from potash salt slurry. The method comprises steps as follows: Step 1, potassium sulfate in potassium chloride salt water is removed by a nanofiltration membrane system, so that a traditional technology for removing potassium sulfate with barium salt is replaced, and potash salt slurry produced by refinement of potassium chloride in a potash technology contains no barium salt in any form; sulfate radicals in potassium chloride salt water are concentrated to be supersaturated by the nanofiltration membrane system, then crystallization is performed at the normal temperature, and potassium sulfate is obtained; Step 2, potassium sulfate prepared in Step 1 is centrifuged and dried or centrifuged and dried after being washed with pure water, chloride-free potassium fertilizer-potassium sulfate fertilizer is directly prepared; dried potassium sulfate is mixed with a nitrogen source and a phosphorus source, and low-chloride NPK compound fertilizer is obtained; Step 3, potash salt slurry prepared in Step 1 is dried and then mixed with the nitrogen source and the phosphorus source, and the chloride-containing NPK compound fertilizer is obtained. With the adoption of the method, the preparation cost is low, energy consumption is low, and the production process is environment-friendly.
Description
Technical field
The present invention relates to a kind of method preparing fertilizer, particularly relate to a kind of method utilizing potash salt slurry to prepare fertilizer.
Background technology
Potassium sulfate is colourless crystallization body, and water absorbability is little, prevented from caking, and physical behavior is good, and using conveniently, is good water soluble potassic fertilizer.Potassium sulfate is also chemically neutral, physiological acidic fertilizer.Potassium sulfate is a kind of without chlorine, high-quality and efficient potash fertilizer, particularly in the plant husbandry of the fear-chlorion crops such as tobacco, grape, beet, tea tree, potato, flax and each planting fruit-trees, is indispensable important fertilizer; It is also the main raw material of high-quality nitrogen, phosphorus, potassium Nitrogen, Phosphorus and Potassium.
Farm crop lack potash fertilizer, will obtain " richets ", and easily volt falls, and are often often called as " Quality Element " by germ insect puzzlement potassium element.It mainly contains the effect of crop quality product: crop 1. can be impelled to utilize nitrogen preferably, increases the content of protein, and can promote the generation of sugar and starch; 2. make kernel, seed, fruit and stem tuber, block root increase, shape and color and luster attractive in appearance; 3. improve the oleaginousness of oil crops, increase ascorbic content in fruit; 4. accelerate the maturation of fruit, vegetables and other crops, the ripening stage is reached unanimity; 5. strengthen product and resist ability of damaging and naturally rot, extend the storing time limit; 6. cotton, the intensity of crudefiber crop fiber, length and fineness is increased, color and luster purity.
Potassium can improve crop anti-adversity, as the ability of drought resisting, the invasion and attack of cold-resistant, resistant to lodging, disease and insect resistance.Therefore salt slurry is if solid waste, and that will be a huge waste, and particularly we are lacked to the country of sylvite, changing this present situation will more be necessary.
The main technique of sulfate radical in potash industry By Electrolysis light salt brine is the medicament mainly barium salt that barium method-chemical precipitation method adds, barium salt has the toxicity of self all to there is very large damage to environment and people, manual operation intensity is large, occur that leakage can cause the secondary pollution fouling of producing, blocking pipe and ionic membrane, shorten the work-ing life of ionic membrane, and bariumchloride belongs to heavy metallic salt, price is also somewhat expensive, according to the potassium hydroxide output of annual output 50000 tons, need to add 647 tons of bariumchlorides, according to 1 ton of bariumchloride 2800 yuan, then just need input more than 180 ten thousand yuan every year, and the foundry loam produced every year just has containing water base: 13500m
3and the foundry loam containing barium salt in potash industry has been defined as secondary solid waste, the price at least 1000 yuan of current domestic process secondary solid waste per ton by environmental law new at present, therefore adopt traditional barium method sulfate radical method, in today that environmental protection dynamics strengthens day by day, use and be more and more restricted.
Summary of the invention
Because the above-mentioned defect of prior art, technical problem to be solved by this invention is to provide a kind of method of the highly purified NpK complex fertilizer of preparation of clean, environmental protection.
For achieving the above object, the invention provides a kind of method utilizing potash salt slurry to prepare NpK complex fertilizer, comprise the following steps:
Step one, the potassium sulfate adopted in nanofiltration membrane system removal Repone K salt solution, to substitute the technique that potassium sulfate removed by old-fashioned barium salt, make the potash salt slurry of Repone K salt refining generation in potash technique not containing any type of barium salt; Sulfate radical in Repone K salt solution is concentrated into supersaturation by nanofiltration membrane system, then carries out normal temperature crystallization, obtains potassium sulfate;
Step 2, potassium sulfate obtained for step one carried out centrifugal and to dry or with centrifugal after pure water and dry, directly obtained chlorideless potassic fertilizer-potassium sulfate fertilizers; Potassium sulfate after oven dry and nitrogenous source, phosphorus source are mixed to get low chlorine N P and K three elements complex fertilizer;
Step 3, the potash salt slurry that the salt refining of step monochlor(in)ate potassium produces is carried out drying treatment, and the potash salt slurry after drying treatment to be mixed with nitrogenous source, phosphorus source, obtain chloride N P and K ternary or polyelement composite fertilizer.
Due to main containing Repone K in the potash salt slurry that Repone K salt refining produces, simultaneously also containing the element such as calcium, magnesium, and calcium magnesium element is also the trace element that farm crop need, so it is feasible for preparing fertilizer with potash salt slurry.Because potash salt slurry water ratio is more than at least 60%, so need before the use to dry, due to make composite fertilizer technique in need moisturizing, with in order to save in post-production fertilizer technique the technique that adds water, potash salt slurry dry after water content requirement control about 10%.The ratio of nitrogen, phosphorus, potassium can be regulated according to the market requirement in the production process for starting material making compound mixed fertilizer with potash salt slurry or potassium sulfate fertilizers.
Further, in described step one, when described nanofiltration membrane system is carried out concentrated, add lattice distortion agent, to delay crystallization; The add-on of lattice distortion agent is 0-300ppm.
Further, described lattice distortion agent is nonnitrogenous, phosphorus, does not have oxidisability.
Further, the add-on of lattice distortion agent is 5-200ppm, is preferably 10-150ppm, is more preferably 15-100ppm.
Further, in described step one, the concentration of the Repone K in Repone K salt solution is 150-290g/l, and the concentration of potassium sulfate is not less than 5g/l.
Further, in described step one, the concentration of the Repone K in Repone K salt solution is 150-290g/l, and the concentration of potassium sulfate is not less than 12g/l.
Further, in described step one, the concentration of the Repone K in Repone K salt solution is 180-280g/l, and be preferably 190-230g/l, the concentration of potassium sulfate is not less than 12.6g/l.
Further, in described step 2, by potassium sulfate obtained for step one by centrifuge, then after drying, water ratio in potassium sulfate is made not higher than 5%, to obtain high grade potassium sulfate fertilizers.
Further, in described step 2, the potassium sulfate that step one is obtained is dried at 50-60 DEG C, and obtain agricultural one-level potassium sulfate fertilizers, in the agricultural one-level potassium sulfate fertilizers of gained, the content of potassium sulfate is greater than 92.5%, and the content of chlorion is less than 1%.
Further, in described step 2, the potassium sulfate pure water post-drying obtained by step one, obtains agricultural top grade product potassium sulfate fertilizers or industrial goods potassium sulfate fertilizers.
Further, the potassium sulfate fertilizers obtained is mixed with nitrogenous source, phosphorus source in required ratio, obtain low chlorine N P and K three elements complex fertilizer.
Further, in described step 3, drying treatment refers to dries potash salt slurry to water ratio as being no more than 20%.
Further, the nanofiltration membrane in described nanofiltration membrane system not higher than 5%, is not less than 95% to the clearance of sulfate radical to the clearance of Repone K.
The present invention adopts embrane method to concentrate sulfate radical in Repone K, substitute barium method sulfate radical, thus make the salt slurry produced during potassium salt refining not containing barium salt, not containing environmental pollution material in salt slurry, the salt slurry that potassium salt refining produces passes through drying treatment, make chloride nitrogen, phosphorus, potassium tri compound mixed fertilizer, the potassium sulfate that the crystallization of membrane concentration potassium sulfate produces also can prepare highly purified potassium sulfate potash fertilizer.
The invention provides the technical scheme that the problem of salt slurry produced by a complete solution potash, allow salt slurry make the starting material of N P and K compound mixed fertilizer simultaneously, turn waste into wealth, for potash enterprise saves the high cost adding bariumchloride, allow again potash enterprise high-purity sulfuric acid potassium prepared by useless foundry loam or membrane concentration prepare fertilizer simultaneously, make the product diversification of enterprise, many-sided is enterprise's creation income, buy further for enterprise carries out green production simultaneously, achieve many things at one stroke.
Method starting material of the present invention are cheaply easy to get; technique is simple; easy to operate; be easy to accomplish scale production, both can produce chlorideless potassic fertilizer potassium sulfate, chloride or low chlorine N P and K three elements complex fertilizer can be produced again; and preparation cost is low, less energy consumption; economic benefit is very remarkable, solves the process problem of potash industry salt slurry, production process environmental protection.
Be described further to the technique effect of design of the present invention, concrete structure and generation, to understand object of the present invention, characteristic sum effect fully below.
Embodiment
A preferred embodiment of the present invention provides a kind of method utilizing potash salt slurry to prepare NpK complex fertilizer, comprises the following steps:
Step one, the potassium sulfate adopted in nanofiltration membrane system removal Repone K salt solution, to substitute the technique that potassium sulfate removed by old-fashioned barium salt, make the potash salt slurry of Repone K salt refining generation in potash technique not containing any type of barium salt; Sulfate radical in Repone K salt solution is concentrated into supersaturation by nanofiltration membrane system, then carries out normal temperature crystallization, obtains potassium sulfate;
Step 2, potassium sulfate obtained for step one carried out centrifugal and to dry or with centrifugal after pure water and dry, directly obtained chlorideless potassic fertilizer-potassium sulfate fertilizers; Potassium sulfate after oven dry and nitrogenous source, phosphorus source are mixed to get low chlorine N P and K three elements complex fertilizer;
Step 3, potash salt slurry obtained for step one is carried out drying treatment, dry to water ratio by potash salt slurry and be no more than 20%, and the potash salt slurry after drying treatment is mixed with nitrogenous source, phosphorus source, obtain chloride N P and K ternary or polyelement composite fertilizer.
In the step one of the present embodiment, when nanofiltration membrane system is carried out concentrated, add lattice distortion agent, to delay crystallization; The add-on of lattice distortion agent is 0-300ppm.In other embodiments, the add-on of lattice distortion agent is 5-200ppm, is preferably 10-150ppm, is more preferably 15-100ppm.Meanwhile, lattice distortion agent is nonnitrogenous, phosphorus, does not have oxidisability.
In the step one of the present embodiment, the concentration of the Repone K in Repone K salt solution is 150-290g/l, and the concentration of potassium sulfate is not less than 5g/l.In other embodiments, the concentration of the Repone K in Repone K salt solution is 150-290g/l, and the concentration of potassium sulfate is not less than 12g/l; Or the concentration of the Repone K in Repone K salt solution is 180-280g/l, and the concentration of potassium sulfate is not less than 12.6g/l; Or the concentration of the Repone K in Repone K salt solution is 190-230g/l, and the concentration of potassium sulfate is not less than 12.6g/l.
In the step 2 of the present embodiment, by potassium sulfate obtained for step one by centrifuge, then after drying, water ratio in potassium sulfate is made not higher than 5%, to obtain high grade potassium sulfate fertilizers.
In the step 2 of the present embodiment, the potassium sulfate that step one is obtained is dried at 50-60 DEG C, and obtain agricultural one-level potassium sulfate fertilizers, in the agricultural one-level potassium sulfate fertilizers of gained, the content of potassium sulfate is greater than 92.5%, and the content of chlorion is less than 1%.
In the step 2 of the present embodiment, the potassium sulfate pure water post-drying obtained by step one, obtains agricultural top grade product potassium sulfate fertilizers or industrial goods potassium sulfate fertilizers.
In the present embodiment, if mixed with nitrogenous source, phosphorus source in required ratio by the potassium sulfate fertilizers obtained, low chlorine N P and K three elements complex fertilizer can be obtained.
Nanofiltration membrane in the nanofiltration membrane system of the present embodiment not higher than 5%, is not less than 95% to the clearance of sulfate radical to the clearance of Repone K.
Embodiment 1:
The production of step one, potassium sulfate---Repone K salt solution engaging sulphate
Utilize the potassium sulfate in nanofiltration membrane concentration systems process Repone K salt solution, wherein 1m
3repone K salt solution in containing 200g/l Repone K and 12.69g/L potassium sulfate, carry out normal temperature crystallization after the sulfate radical in Repone K salt solution being concentrated into supersaturation, obtained 3.82kg potassium sulfate.Owing to adopting the potassium sulfate in nanofiltration membrane system removal Repone K salt solution, to substitute the technique that potassium sulfate removed by old-fashioned barium salt, make the potash salt slurry of Repone K salt refining generation in potash technique not containing any type of barium salt.
The production of step 2, potassium sulfate fertilizers or low chlorine N P and K three elements complex fertilizer
The potassium sulfate that step one is obtained carries out centrifugal and dries at 50-60 DEG C, to be dried or with centrifugal after pure water and dry, obtain the agricultural one-level potassium sulfate fertilizers of 3.64kg, in the agricultural one-level potassium sulfate fertilizers of gained, the content of potassium sulfate is greater than 92.5%, and the content of chlorion is less than 1%.If the potassium sulfate pure water post-drying obtained by step one, can obtain agricultural top grade product potassium sulfate fertilizers or industrial goods potassium sulfate fertilizers.If mixed with nitrogenous source, phosphorus source in required ratio by the potassium sulfate fertilizers obtained, low chlorine N P and K three elements complex fertilizer can be obtained.
The production that the mixing of step 3, chloride N P and K compound is fertile
By the potash salt slurry (1m that Repone K salt refining in potash technique produces
3) dry to water ratio 10%, the primary solids of now separating out is Repone K, obtain the moisture Repone K of 288kg, allocate the nutritive element such as other nitrogenous source, phosphorus source into by the market requirement, make chloride N P and K ternary or multiple elements design mixed fertilizer by fragmentation, mixing, granulation, oven dry, pack.
More than describe preferred embodiment of the present invention in detail.Should be appreciated that those of ordinary skill in the art just design according to the present invention can make many modifications and variations without the need to creative work.Therefore, all technician in the art, all should by the determined protection domain of claims under this invention's idea on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment.
Claims (10)
1. utilize potash salt slurry to prepare a method for NpK complex fertilizer, it is characterized in that, comprise the following steps:
Step one, the potassium sulfate adopted in nanofiltration membrane system removal Repone K salt solution, to substitute the technique that potassium sulfate removed by old-fashioned barium salt, make the potash salt slurry of Repone K salt refining generation in potash technique not containing any type of barium salt; Sulfate radical in Repone K salt solution is concentrated into supersaturation by nanofiltration membrane system, then carries out normal temperature crystallization, obtains potassium sulfate;
Step 2, potassium sulfate obtained for step one carried out centrifugal and to dry or with centrifugal after pure water and dry, directly obtained chlorideless potassic fertilizer-potassium sulfate fertilizers; Potassium sulfate after oven dry and nitrogenous source, phosphorus source are mixed to get low chlorine N P and K three elements complex fertilizer;
Step 3, the potash salt slurry that the salt refining of step monochlor(in)ate potassium produces is carried out drying treatment, and the potash salt slurry after drying treatment to be mixed with nitrogenous source, phosphorus source, obtain chloride N P and K ternary or polyelement composite fertilizer.
2. the method utilizing potash salt slurry to prepare NpK complex fertilizer according to claim 1, is characterized in that, in described step one, when described nanofiltration membrane system is carried out concentrated, adds lattice distortion agent, to delay crystallization; The add-on of lattice distortion agent is 0-300ppm.
3. the method utilizing potash salt slurry to prepare NpK complex fertilizer according to claim 1, is characterized in that, described lattice distortion agent is nonnitrogenous, phosphorus, does not have oxidisability.
4. the method utilizing potash salt slurry to prepare NpK complex fertilizer according to claim 1, is characterized in that, in described step one, the concentration of the Repone K in Repone K salt solution is 150-290g/l, and the concentration of potassium sulfate is not less than 5g/l.
5. the method utilizing potash salt slurry to prepare NpK complex fertilizer according to claim 1, is characterized in that, in described step 2, the potassium sulfate that step one is obtained passes through centrifuge, then, after drying, water ratio in potassium sulfate is made not higher than 5%, to obtain high grade potassium sulfate fertilizers.
6. the method utilizing potash salt slurry to prepare NpK complex fertilizer according to claim 1, it is characterized in that, in described step 2, the potassium sulfate that step one is obtained is dried at 50-60 DEG C, obtain agricultural one-level potassium sulfate fertilizers, in the agricultural one-level potassium sulfate fertilizers of gained, the content of potassium sulfate is greater than 92.5%, and the content of chlorion is less than 1%.
7. the method utilizing potash salt slurry to prepare NpK complex fertilizer according to claim 1, it is characterized in that, in described step 2, the potassium sulfate pure water post-drying obtained by step one, obtains agricultural top grade product potassium sulfate fertilizers or industrial goods potassium sulfate fertilizers.
8. the potash salt slurry that utilizes according to claim 6 or 7 prepares the method for NpK complex fertilizer, it is characterized in that, is mixed by the potassium sulfate fertilizers obtained in required ratio with nitrogenous source, phosphorus source, obtains low chlorine N P and K three elements complex fertilizer.
9. the method utilizing potash salt slurry to prepare NpK complex fertilizer according to claim 1, is characterized in that, in described step 3, drying treatment refers to and the oven dry of potash salt slurry is no more than 20% to water ratio.
10. the method utilizing potash salt slurry to prepare NpK complex fertilizer according to claim 1, is characterized in that, the nanofiltration membrane in described nanofiltration membrane system not higher than 5%, is not less than 95% to the clearance of sulfate radical to the clearance of Repone K.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112591770A (en) * | 2020-10-09 | 2021-04-02 | 上海氯德新材料科技有限公司 | Process and apparatus for purifying and separating potassium sulfate from light salt water |
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Application publication date: 20160427 |