1. New process of compound compound fertilizer made from molten urea (ammonium nitrate) ammonium phosphate double slurry
The process fully utilizes the crystallization heat of urine (ammonium nitrate) for thermal granulation, adopts a rapid-mixing granulator, and rapidly mixes solid materials with high-temperature slurry.
In the course of the process, the simultaneous granulation-fragmentation-regranulation process recurs, the plasticity of the material is enhanced, and at the same time, partial granulation is formed.
Nuclei, and then appropriately heated to form a round granulated particles. The particle size distribution of the material at the outlet of the granulator is good, and the rate of first ball formation in the granulator is increased.
The product has low moisture content, improved strength and anti-caking properties, and does not substantially agglomerate without treatment. Due to the elimination of the traditional drying steps of the pellet method, the exhaust gas belt is reduced.
Taking the heat, the use of energy is more reasonable, while the investment in disposable equipment and plant land is reduced.
2. New technology of high N multi-standard compound fertilizer made from molten urea (ammonium nitrate)
The method is improved in the production technology of the conventional drum aggregate compound fertilizer, and the high concentration of urine (ammonium nitrate solution) is directly introduced into the granulator.
The operation cost of urea (ammonium nitrate) granulation and the packaging cost of granular products, as well as the raw material crushing equipment in the original granulation granulation apparatus were removed. Urine (
The ammonium nitrate solution is sprayed on the granulator material bed to form a uniform slurry film on the surface of the returned particles, and there are two functions of granules and coating in the granulation process.
Therefore, the product has a good appearance, high compressive strength and anti-caking properties. In addition, urine (ammonium nitrate solution) is released when crystallized in the granulator
A large amount of crystallization heat can increase the granulation temperature, reduce the amount of steam and water added to the granulator, reduce the moisture of the granulation materials, and reduce energy consumption in the drying process
, Reduce product production costs.
3. Melt granulation process
The technical principle of high-concentration urea-based (nitrogen)-nitrogen-phosphorus-potassium compound fertilizer produced by melt granulation is the use of molten urea (ammonium nitrate) to form a eutectic point with ammonium phosphate or potassium chloride.
The characteristics of the compound, the powdered ammonium phosphate and potassium chloride are preheated and then added to the molten urea (ammonium nitrate) solution to form a slurry containing a solid suspension with fluidity.
The slurry is sprayed into the air tower through the spray head and cooled in the air to form pellets. A urea-based compound fertilizer product with uniform nutrient distribution and good particle properties is obtained. The worker
Art directly utilizes a concentrated solution of urea (nitroammonium) to eliminate the spray granulation process of urea (ammonium nitrate) solution and breakage of solid urea (ammonium nitrate) compound fertilizer
Shredding operation simplifies the production process; the process makes full use of the heat energy of the original molten urea (ammonium nitrate), the moisture content of the material is very low, and the drying process is not needed.
The energy consumption is saved; the percentage of product qualified particles is high, and the production process is basically free of return material; the particles have a smooth, rounded surface and are not easy to agglomerate.
Market Competitiveness.
4. High nitrogen non-chlorine-sulfur-based compound fertilizer production technology
The process uses excess sulfuric acid to decompose potassium chloride and pipeline reactor technology. Hydrogen sulfate can be produced at lower temperatures when excess sulfuric acid reacts with potassium chloride.
Potassium, the potassium hydrogen sulfate sulfate slurry and Qingjiang water can be directly mixed into the pipeline reactor for amination reaction to produce a high concentration of chlorine-free potassium sulfate.
Compound fertilizer. The core of this technology is to use a small, simple structure of the reaction tube for the chemical reaction of ammonia and inorganic acids, the reaction generates a lot of heat
Effectively atomize the slurry and evaporate moisture, so that the slurry reaching the material bed in the drum granulator contains suitable moisture, reducing the return of the granulation process
Ratio and energy consumption. After granulation, the material is dried, sieved and cooled to obtain a qualified product. The HCl evolved from the reaction is absorbed by the water and is recovered as approximately 30% hydrochloric acid.
, exhaust emissions in line with national standards. The monoammonium phosphate and urea required for the balance of nutrients are metered and added to the granulator to produce a high concentration of various nutrient ratios.
Granular compound fertilizer.
5. Introduction of Technical Transformation Complete Sets of Pu'ercal Plant
Over the past few years, through research and development on the related technologies of general calcium, a series of scientific research achievements have been made, which can provide corresponding technical reforms for China's primary calcium production enterprises.
Complete technology.
5.1 Non-stacked Matured Calcium Continuous Production Technology
The process is pre-mixed with fluorosilicic acid and rock phosphate, and further reacted with excess concentrated sulfuric acid. The reacted calcium preservative slurry is pumped to the drum granulator.
The other part of the rock phosphate powder is granulated, dried and then directly made into granular general calcium products, or other basic fertilizers are added during the granulation process, and obtained by granulating and drying.
Granular NPK fertilizer products. The technology process has wide adaptability and can change fertilizer types. In addition to the reaction system with molybdenum titanium or 316L, other design
Available plastic, plain carbon steel. This technology can save the huge maturation warehouse of the general calcium plant (about 50,000 tons, about 700 M2), and reduce the time due to the aging of calcium and calcium.
There is a lot of liquidity. The use of fluorosilicic acid can save sulfuric acid consumption and reduce production costs. Preliminary calculations show that the 50,000-ton Calcium-calcium plant has been converted to unstacked
The general-purpose calcium process uses Kaiyang phosphate rock as raw material, which can increase profits and taxes by about 1 million yuan each year.
5.2 Sulfur Nitrogen and Phosphorus Compound Fertilizer Production Technology
Sulfur nitrogen and phosphorus compound fertilizer, also known as urea calcium or urea phosphate fertilizer, it is the use of urea and calcium sulfate will form a stable adduct tetra urea calcium sulfate, and urea is easy
The principle of forming a stable urea sulfate solution in sulfuric acid, and organically combining the secondary processing of urea with the existing production method of precured calcium to produce slow-acting sulfur
Based nitrogen and phosphorus compound fertilizer. Granular urea is dissolved in sulfuric acid to form a urea sulfate decomposition liquid to decompose the rock phosphate powder, and through the mixing reaction, the slurry is solidified and converted into
Three stages of ripening of raw materials can produce sulfur-based nitrogen-phosphorus compound fertilizer products. For products within a certain specification range, curing and drying sections can also be omitted. The
Fertilizers can be further made with ammonium phosphate, potassium chloride and other basic fertilizers through the pellet method to produce high-concentration NPK fertilizers. The process has no waste liquid discharge,
During the production process, almost no fluorine gas escapes, and existing Pu-calcium production equipment can be used. Product specifications: total nutrient (N+P2O5) is 20%~30%, moisture content is ~3%
N: P2O5 is 1:1 (adjust as needed).
The technology directly uses concentrated sulfuric acid, so that the powdery granular sulfur-based nitrogen-phosphorus compound fertilizer product only moisture content ~ 3%, while the traditional general calcium product moisture content of up to 10% ~ 14%,
If the powdery granular sulfur-based nitrogen-phosphorus compound fertilizer is granulated, the unit energy consumption of P2O5 can save about 40% of the dry energy. This technology avoids expensive phosphoric acid production.
The cost is relatively low, and there is no problem of stacking phosphogypsum. The same compound fertilizer is produced, and the consumption of sulfuric acid can be reduced by about 30%. This technology will secondary processing of urea
In combination with the transformation of Pu-calcium production plant, Urea and calcium sulphate in the product form a stable adduct, which greatly improves the efficiency of chemical fertilizers.
Utilization rate increases fertilizer efficiency.
5.3 High-efficiency Nitrogen, Phosphorus, Potassium Compound Fertilizer Production Technology
Features of patented technology: a. The maturation period of the product is short, and even the maturation period can be eliminated. The infrastructure investment for building a huge maturation warehouse can be saved and relayed during the maturation period.
Continuing power consumption for turning and handling increased capital utilization and greatly reduced production costs. b. The product has excellent physical properties, no caking, easy
Post-processing and use alone. c. The product is NPK fertilizer, the total nutrients (N+P2O5+K2O) can reach 25%~30%, and it contains the sulfur necessary for crop growth.
Vegetarian, calcium, balanced nutrition can increase the utilization of fertilizers. d. The low rate of fluorine and chlorine evolution during production increases the degree of environmental protection.
There are no special anti-corrosion requirements. e. The existing Pu-calcium production device can be used, and the operation and control are easy, which is suitable for the technical transformation of Pu-calcium plant. New installation investment
Province, quick. f. Patented technology for the manufacture of high-efficiency nitrogen, phosphorus, and potassium compound fertilizers. Magnesium, boron, zinc, copper, iron, molybdenum, etc. can be easily added during the production process.
The amount of elemental compounds, made of a variety of special fertilizers, to suit different crops, soil, climate and other requirements.
5.4. Unstacked USP Continuous Production Technology
Due to the low reactivity of phosphate rock resources in China, USP slurry often encounters uncured, freshly-fertilized and matured materials during the chemical conversion process.
Poor, follow-up processing difficulties and other issues. Urea and calcium sulfate form stable adducts,
The calcium production method is organically combined, and the urea solution is used to decompose the rock phosphate powder. The reaction-generated USP slurry is pumped into the drum granulator and additives are added.
Or the basic fertilizers are granulated together, and after drying, they are directly made into granular USP products or granular NPK compound fertilizer products. As the production of urea and calcium sulfate in the product is stable
The adducts determined clearly can effectively control the release rate of urea, thereby increasing the utilization of urea. No Stacking and Curing USP Continuous Production Technology Set No Stack
The advantages of aging and generalized calcium and chemical formation USP technology in one, more suitable for China's national conditions.
5.5. BSP-1 type general calcium additive
This product is a kind of special effect additive developed for improving the physical properties of calcium sulphate. It is suitable for the aging process of calcium sulphate and can make the calcium sulphate product become loose.
It is not easy to cake.
BSP-1 Calcium Calcium Calcium Additive is a surface active agent compound. It is light yellow liquid under normal temperature, specific gravity is ~0.96Kg/m3, pH value is ~7, it is non-toxic and non-inflammable.
article.
The additive can be used directly, generally at the third paddle of a vertical four-prong mixer or near the outlet of a horizontal mixer, and additives must be added at the position to ensure the additive.
Mix well with Pu-Ca slurry. Additive feed metering can be performed with metering pumps or high tank adjustment valves. Both methods should be preceded by school traffic to
Reach design flow.
The amount of BSP-1 Pu-Ca additive is adjusted within a certain range according to the nature of the phosphate rock, which is generally 400-500 g/ton of phosphate ore, converted into normal calcium.
200~250g/ton calcium fluoride. Packing specification: 180Kg iron drum
6. Conversion process for the production of potassium sulfate and potassium nitrate
6.1 Ammonium Sulfate? Potassium Chloride Conversion Process Potassium Sulfate and Potassium Chloride
Ammonium Sulfate and Potassium Chloride Conversion Method for Producing Ammonium Potassium Sulfate Based on NH4+-K+-Cl--SO42--H2O System with Potassium Sulfate, Ammonium Sulfate, Ammonium Chloride and Potassium Chloride
This physical and chemical phenomenon exists in the body:
2(n+1)KCl + (n+1)(NH4) 2SO4 ? nK2SO4(NH4)2SO4 + 2(nNH4ClKCl)
Through the dissolving of the ingredients, the potassium ammonium sulfate crystals are transformed and precipitated under certain stability, and the conversion slurry is separated and washed by liquid to obtain the potassium ammonium sulfate product. Filter washing
The solution evaporates and crystallizes, and potassium ammonium chloride is separated off. The filtered mother liquor is returned to the converter or evaporator.
The main products obtained by this method are 85% K2SO4 and 15% (NH4)2SO4 solid solution. The coproduct is potassium ammonium chloride.
6.2 Ammonium Nitrate and Potassium Chloride Conversion Potassium Nitrate Production Technology
Ammonium nitrate-potassium chloride conversion method of potassium nitrate production technology has the characteristics of low investment cost, low technical difficulty, easy construction, and easy utilization of by-products. The law of things
The chemical and chemical basis is that the K+-NH4+-NO3--Cl--H2O quaternary system in which potassium nitrate, ammonium chloride, potassium chloride, and ammonium nitrate exist in their respective crystalline regions, and are suitable
Different salt precipitation procedures were controlled under process conditions to obtain potassium nitrate and ammonium chloride. The product meets the agricultural grade requirements. If further purification available industrial grade products
.
Potassium chloride was dissolved into an aqueous solution and the mother liquor after separation of ammonium chloride was mixed, concentrated by evaporation, cooled and crystallized, and potassium nitrate was precipitated. Liquid-solid separation of potassium nitrate product.
The filtrate was added with ammonium nitrate and evaporated to precipitate ammonium chloride. Liquid-solid separation of ammonium chloride products, mother liquor return to the beginning of the system, the two products are dried, that is,
Main and subsidiary products.
7. Anti-caking agent
We have studied for many years the anti-caking agent technology for fertilizers. The developed anti-caking agents are A-1, A-2 and A-3. This kind of anti-blocking agent is solid
The polymer, coated on the surface of the fertilizer particles, can act as a hydrophobic effect, can inhibit the intrusion of moisture, hinder the formation of crystal salt bridges, and improve the storage of fertilizers.
Chemical reactions prevent the unity and agglomeration of fertilizers. After years of practice and application, these two anti-caking agents proved to be effective in high-concentration compound fertilizers.
Well, the effect is obvious in the use of high-concentration compound fertilizers such as phosphorus nitrate potassium compound fertilizer, urea-ammonium phosphate-potassium chloride, ammonium nitrate-ammonium phosphate, and potassium sulfate.
Potassium nitrate and potassium compound fertilizer can be used for more than six months to avoid agglomeration, especially for coloring chemical fertilizer spraying anti-caking agent to maintain the fertilizer does not change color. We are still constantly
Research and develop inexpensive and highly efficient anti-caking agents to meet the needs of the market.
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