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 the solid material and the high-temperature slurry are mixed in a rapid mixing process, and at the same time there is granulation-breaking-reforming In this process of reciprocating circulation, the plasticity of the material is enhanced, and at the same time, part of the crystallized nucleus is formed, and then the granulated granules are formed after appropriate temperature elevation. The particle size distribution of the material at the outlet of the granulator is good, the rate of one-time ball formation in the granulator is increased, the product moisture is low, and the strength and anti-blocking performance are improved, and there is basically no agglomeration without treatment. Due to the elimination of the traditional drying steps of the pellet method, the use of exhaust gas to reduce heat, the use of energy is more reasonable, while the investment in one-time 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 original drum aggregate granulation compound fertilizer, and the high-concentration urine (ammonium nitrate solution) is directly introduced into the granulator, thereby eliminating the operation cost and granular product of urea (nitrogen ammonium) granulation. The packaging costs and the raw material crushing equipment in the original pellet granulation device. The urine (ammonium nitrate solution) is sprayed on the material bed of the granulator to form a uniform slurry film on the surface of the returning granules. In the granulation process, there are two functions of granules and coating, so the product has a good appearance and has a relatively high appearance. Compressive strength and anti-caking properties. In addition, since urine (ammonium nitrate solution) releases a large amount of crystallization heat during crystallizing in the granulator, the granulation temperature can be increased, the amount of steam and water added to the granulator can be reduced, and the moisture of the granulation material can be reduced and drying can be reduced. The energy consumption in the process reduces the production cost of the product.
3. Melt granulation process
The technical principle of high-concentration urea-based (nitrogen)-nitrogen-phosphorus-potassium compound fertilizers produced by melt granulation is characterized by the use of melted urea (ammonium nitrate) to form eutectic compounds with ammonium phosphate or potassium chloride. After preheating with potassium chloride, the molten urea (ammonium nitrate) solution is added to form a slurry containing a solid suspension having fluidity. The slurry is sprayed into the empty tower through a spray nozzle and cooled in the air to form a pellet; uniform nutrient distribution is obtained. The urine-based compound fertilizer product with better grain traits. The process directly utilizes a concentrated solution of urea (ammonium nitrate), eliminates the spray granulation process of urea (ammonium nitrate) solution, and the crushing operation of solid urea (ammonium nitrate)-made compound fertilizer, and simplifies the production process; Make full use of the heat energy of the original molten urea (ammonium nitrate), the moisture content of the material is very low, no drying process is required, and energy consumption is greatly saved; the percentage of qualified product particles is high, and there is basically no return material in the production process; the surface of particles is smooth and round It is not easy to be agglomerated and has a high 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. When excess sulfuric acid reacts with potassium chloride, potassium bisulfate can be prepared at a lower temperature, and potassium bisulfate sulfate slurry and Qingjiang water can be used in certain proportions. Mixing can be directly into the pipe reactor for ammoniation to produce a high concentration of potassium sulfate-free potassium sulfate compound fertilizer. The core of this technology is to use a very small, simple structure of the reaction tube for the chemical reaction of ammonia and inorganic acid, the large amount of heat generated by the reaction to effectively atomize the slurry and evaporate water, so as to reach the drum granulator The slurry on the inner material bed contains suitable moisture, reducing the material return ratio and energy consumption in the granulation process. After granulation, the material is dried, sieved and cooled to obtain a qualified product. The HCl evolved from the reaction is recovered as water with a concentration of approximately 30% hydrochloric acid, and the tailpipe emissions comply with national standards. The monoammonium phosphate and urea required for the balance of nutrients are metered and then added to the granulator to produce a high concentration granular compound fertilizer with various nutrient and nutrient ratios.
5. Introduction of Technical Transformation Complete Sets of Pu'ercal Plant
Over the past few years, through the development and research of related technologies for calcium and calcium, we have obtained a series of scientific research results, which can provide corresponding complete sets of technologies for the technological transformation of China's primary calcium production enterprises.
5.1 Non-stacked Matured Calcium Continuous Production Technology
The process is pre-mixed with fluorosilicic acid and rock phosphate, and then further reacted with excess concentrated sulfuric acid. The reacted calcium preservative slurry is pumped to the drum granulator and the other part of the phosphate rock powder is granulated and dried. Directly made granular calcium carbonate products, or adding other basic fertilizers during the granulation process, and granulating and drying to obtain granular NPK fertilizers. The technology process has wide adaptability and can change fertilizer types. In addition to the reaction system using molybdenum dititanium or 316L, other equipment available plastic, ordinary carbon steel. This technology can eliminate the huge maturation warehouse of the general calcium plant (about 50,000 tons, about 700 M2), and reduce the large amount of liquidity that will be occupied due to the aging time of crude calcium. The use of fluorosilicic acid can save sulfuric acid consumption and lower production costs. Preliminary calculations show that the 50,000-ton Calcium Calcium Plant was converted to a non-stacked mature calcium sulphide process, and Kaiyang Phosphorus Mine was used as a raw material. The annual profit and tax can be increased by approximately 1 million yuan. .
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 calcium tetrahydrate, and urea can be easily dissolved in sulfuric acid to form a stable principle of urea sulfate, The secondary processing of urea is organically combined with the existing method of production of precured calcium to produce a slow-acting sulfur-based nitrogen-phosphorus compound fertilizer. The granular urea is dissolved in sulfuric acid to form a urea sulfate decomposition solution to decompose the phosphate rock powder, and the sulfur-based nitrogen-phosphorus compound fertilizer product can be obtained through a mixture reaction, solidification and chemical conversion of the slurry, and three-phase aging of the chemical material. For products within a certain specification range, curing and drying sections can also be omitted. The fertilizer can be further made into basic fertilizers such as ammonium phosphate, potassium chloride and other basic fertilizers through a pellet method to produce a medium-high concentration NPK fertilizer. The process has no waste liquid discharge, and basically no fluorine gas escapes during the production process, and can use existing general calcium production equipment. Product specifications: total nutrients (N + P2O5) is 20% ~ 30%, moisture content is ~ 3%, N: P2O5 is 1:1 (adjustable according to need).
The technology directly uses concentrated sulfuric acid, so that the powdered granular sulfur-based nitrogen-phosphorus compound fertilizer product only moisture content ~ 3%, while the traditional super-calcium product moisture content of up to 10% to 14%, if the powder granular sulfur-based nitrogen and phosphorus compound fertilizer Grain, in terms of unit P2O5, can save about 40% of the dry energy consumption, the technology avoids expensive phosphoric acid, production costs are relatively low, there is no problem with the accumulation of phosphogypsum, production of the same compound fertilizer, sulfuric acid consumption can be About 30% reduction. The technology organically combines the secondary processing of urea with the reformation of a general calcium production device. The urea and calcium sulfate in the product form a stable adduct, which greatly improves the utilization of fertilizer and increases the fertilizer efficiency.
5.3 High-efficiency Nitrogen, Phosphorus, Potassium Compound Fertilizer Production Technology
The characteristics of patented technology: a. Short maturation period of products, or even no maturation period, can save infrastructure investment for building huge maturation warehouses, and continue to turn over and transport the power consumption during maturation period, improve the utilization of funds and greatly reduce The production cost. b. The product is of good physical properties, does not agglomerate, is easy to handle and used alone. c. The product is NPK fertilizer, total nutrients (N + P2O5 + K2O) up to 25% ~ 30%, and contains the sulfur and calcium required for crop growth, balanced nutrition, can increase fertilizer utilization. d. The low rate of fluorine and chlorine evolution during the production process increases the degree of environmental protection, and there are no special anti-corrosion requirements for the equipment. 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. The new device investment province has quick results. f. Patented technology for the manufacture of high-efficiency nitrogen, phosphorus and potassium compound fertilizers. It is convenient to add trace elements such as magnesium, boron, zinc, copper, iron, and molybdenum during the production process to make various special fertilizers to suit different crops and soils. , climate and other requirements.
5.4. Unstacked USP Continuous Production Technology
Due to the relatively low reactivity of phosphate resources in China, USP slurry often encounters problems such as uncured USP slurry for a long time, poor physical properties of fresh and cooked materials, and difficulties in follow-up processing during the formation of USP. 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 a drum granulator, granulated together with an additive or a basic fertilizer, and then directly dried to form pellets. USP products or granular NPK compound fertilizer products. Because of the stable adducts produced by urea and calcium sulfate in the product, it is apparent that the release rate of urea can be effectively controlled, thereby increasing the utilization of urea. Non-stacking and maturation USP continuous production technology sets the advantages of unstacked curing calcium and chemical formation USP technology, which is 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 Pu-Ca, which is suitable for the aging process of Ca-po-calcium. It can make the Pu-Ca product become loose and not easy to agglomerate.
BSP-1 type general-calcium additive is a surfactant compound, light yellow liquid at room temperature, specific gravity ~0.96Kg/m3, pH value ~7, non-toxic, non-flammable and explosive materials.
The additive can be used directly and is generally added at the third paddle of a vertical four paddle mixer or near the outlet of a horizontal mixer. The position of the additive needs to ensure that the additive and the calcium preservative slurry are uniformly mixed. Additive feed metering can be performed with metering pumps or high tank adjustment valves. Both methods should be preceded by school flow to achieve design flow.
The dosage of BSP-1 type general calcium additive is adjusted within a certain range according to the nature of phosphate rock, generally 400-500 g/ton phosphate ore, which is converted into 200-250 g/t normal calcium. 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 the Production of Ammonium Potassium Sulfate Based on NH4+-K+-Cl--SO42--H2O System Phosphoric Acid, Ammonium Sulfate, Ammonium Chloride and Potassium Chloride :
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. The filtrate was evaporated and crystallized, and ammonium chloride was separated. 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 physical and chemical basis of the method is that K+-NH4+-NO3--Cl--H2O quaternary system has potassium nitrate, ammonium chloride, potassium chloride and ammonium nitrate in their respective crystal areas. Under the appropriate process conditions, different salts are controlled. The precipitation procedure yields potassium nitrate and ammonium chloride. The product meets the agricultural grade requirements. If further purification can be 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, the mother liquor returned to the beginning of the system, the two products were dried, that is, the main product.
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 type of anti-caking agent is a solid polymer that coats the surfaces of fertilizer particles and acts as a hydrophobic effect, inhibits the intrusion of moisture, hinders the formation of crystal salt bridges, improves the chemical reaction of fertilizers during storage, and prevents the unity of fertilizers. Caking. After years of practice and application, these two kinds of anti-caking agents proved to be very effective in the use of high-concentration compound fertilizers, such as potassium phosphorus nitrate compound fertilizer, urea-ammonium phosphate-potassium chloride, ammonium nitrate-ammonium phosphate-sulfuric acid. Potassium and other series of high-concentration compound fertilizers have obvious effects in the use of phosphorus nitrate and potassium compound fertilizer can be used for more than six months without caking, especially after the coloring fertilizer spraying anti-caking agents can maintain the fertilizer does not change color. We are also continuously researching and developing inexpensive and highly effective anti-caking agents to meet market demand.
The greenhouse a filled with equipment like hydroponic, irrigation, auxiliary lighting ,temperature and humidity control and also may be automatically controlled by a computer to maximize potential growth.
Hydroponics can be used to make the most use of the interior space. The relatively closed environment of a greenhouse has its own unique management requirements, compared with outdoor production. Pests and diseases, and extremes of heat and humidity, have to be controlled, and irrigation is necessary to provide water. Most greenhouses use sprinklers or drip lines. Significant inputs of heat and light may be required, particularly with winter production of warm-weather vegetables.
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