Calcium superphosphate
Calcium superphosphate
CAS: 10031-30-8
Molecular Formula: CaH7O5P
Calcium superphosphate - Names and Identifiers
| Name | Calcium superphosphate |
| Synonyms | Calcium phosphate mo Calcium perphosphate MONOCALCIUM PHOSPHATE Calcium superphosphate calcium phosphate hydrate Calcium phosphate monobasic calcium diphosphate hydrate Calcium phosphate, monobasic Calcium superphosphate·hydrate Calcium phosphate monobasic calcium bis(dihydrogen phosphate) PRIM-CALCIUM PHOSPHATE MONOHYDRATE ACID CALCIUM PHOSPHATE, MONOHYDRATE (4-chloro-2-methylphenoxy)acetic acid |
| CAS | 10031-30-8 |
| EINECS | 600-059-8 |
| InChI | InChI=1/Ca.2H3O4P.H2O/c;2*1-5(2,3)4;/h;2*(H3,1,2,3,4);1H2/q+2;;;/p-2 |
| InChIKey | ZBZJARSYCHAEND-UHFFFAOYSA-L |
Calcium superphosphate - Physico-chemical Properties
| Molecular Formula | CaH7O5P |
| Molar Mass | 158.1 |
| Density | 2.220^1^6 |
| Melting Point | 100°C |
| Boling Point | 203°C |
| Flash Point | 203°C |
| Water Solubility | moderately soluble H2O; soluble dilute HCl, HNO3, acetic acid [MER06] |
| Vapor Presure | 1.41mmHg at 25°C |
| Appearance | White-like or black-gray powder |
| Color | white |
| Odor | Odorless |
| Merck | 14,1693 |
| Storage Condition | Room Temprature |
| MDL | MFCD00149602 |
| Physical and Chemical Properties | A colorless or light gray granular (or powdery) fertilizer. most of the solubility is soluble in water, a small part is insoluble in water and soluble in 2% citric acid (citric acid solution) solution. |
| Use | Mainly used as topdressing, base fertilizer or seed fertilizer for crops |
Calcium superphosphate - Risk and Safety
| Hazard Symbols | Xi - Irritant |
| Risk Codes | 36/37/38 - Irritating to eyes, respiratory system and skin. |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36/37 - Wear suitable protective clothing and gloves. |
| WGK Germany | 2 |
| RTECS | TB8530000 |
| HS Code | 31031090 |
Calcium superphosphate - Upstream Downstream Industry
Calcium superphosphate - Reference Information
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| acidic chemical phosphate fertilizer | superphosphate is a loose and porous acidic chemical phosphate fertilizer, which is formed by the reaction of phosphate rock powder with dilute sulfuric acid. the main component is monocalcium phosphate, with a phosphorus content of 16%-18% and a side component of calcium sulfate, with a weight of about 50%, low phosphorus content and more side components. It is grayish white to dark gray powder at room temperature, which is corrosive and hygroscopic. It is easy to absorb moisture and agglomerate when it is often contacted with humid air. If the storage time is long, part of the water-soluble phosphorus will be converted into insoluble phosphorus, and the humidity and temperature The higher, the faster the transformation speed. Calcium superphosphate is a water-soluble phosphate fertilizer with fast fertilizer effect. It can be used as base fertilizer, early topdressing or topdressing outside the root. It contains a large amount of calcium sulfate, which can supplement sulfur when applied in sulfur-deficient soil The role of nutrition is suitable for various crops, and is more suitable for alkaline soil, slightly alkaline soil and neutral soil. It is not suitable for mixed application with alkaline fertilizers such as lime and plant ash. It can not only promote the growth and development of crops, but also enable plants to enhance disease resistance and drought resistance, mature early, not easy to lodging, and have a significant yield increase effect on cotton, sugar beet, sugarcane, and wheat. |
| traits | dark gray or off-white powder |
| properties | calcium superphosphate is dark gray, off-white and loose. Water-soluble quick-acting phosphate fertilizer, weakly acidic. Most of them are easily soluble in water, and a few are insoluble in water and easily soluble in 2% citric acid (citron solution) solution. |
| use | as top dressing, base fertilizer or seed fertilizer application for crops, supplying plant phosphorus, calcium, sulfur and other elements, and improving alkaline soil. It can be used as base fertilizer, topdressing outside the root, and foliar spraying. Mixed with nitrogen fertilizer, nitrogen fixation effect, reduce the loss of nitrogen. It can promote the germination, root growth, branching, fruiting and maturation of plants, and can be used as a raw material for the production of compound fertilizer. Used in fertilizer, glass manufacturing, plastic stabilizer, livestock auxiliary feed. This product is used as a supplement for calcium and phosphorus in feed processing Mainly used as top dressing, base fertilizer or seed fertilizer application for crops |
| calcium superphosphate | calcium superphosphate is a high concentration, water-soluble quick-acting phosphate fertilizer. The manufacturing method has been improved so that the fertilizer does not contain impurities such as calcium sulfate, thus greatly increasing the phosphorus content, which is as high as 46% ~ 54%. It is a high-concentration phosphate fertilizer. Compared with the phosphorus 18% contained in ordinary superphosphate, heavy superphosphate is also called double superphosphate or triple superphosphate. Therefore, calcium superphosphate is regarded as a fine product of phosphate fertilizer, suitable for various food crops and cash crops such as rice, wheat, corn, sorghum, cotton, melons and fruits, vegetables, etc.; suitable for red soil, yellow soil, brown soil, Yellow tide soil, black soil, cinnamon soil, purple soil, albic soil and other soils are especially suitable for application in phosphorus-deficient areas such as North China, Northeast China and Northwest China. However, the problem of sulfur deficiency will naturally occur when applying heavy superphosphate all year round. The acidic soil in the south is prone to sulfur deficiency, and sulfur-loving plants such as onion and garlic vegetables are prone to sulfur deficiency. The symptoms of sulfur deficiency in crops are similar to nitrogen deficiency. The main feature is that the leaves lose green and yellowing, but from the subtle performance, there are differences. The symptoms of nitrogen deficiency start from the lower old leaves, while the symptoms of sulfur deficiency start from the upper new leaves. For example, potatoes are deficient in sulfur. First, the upper leaves are generally yellowing. In severe cases, brown spots appear on the leaves. |
| fertilization method | superphosphate is suitable for various crops and various soils. Because it contains a large amount of gypsum and free acid, it is especially suitable for acidic soils. It can be used as base fertilizer and topdressing, as well as seed fertilizer and topdressing outside the root. Base fertilizer for the soil lacking available phosphorus, the application amount per mu can be about 50kg, and half of the soil can be evenly sprinkled before the cultivated land, combined with the cultivated land as base fertilizer. Before sowing, sprinkle the other half evenly, and apply the soil shallowly in combination with soil preparation to apply phosphorus in layers. In this way, the fertilizer effect is better, and the utilization rate of its effective ingredients is also high. If it is mixed with organic fertilizer as base fertilizer, the application amount of calcium phosphate per mu should be about 20-25kg. Centralized application methods such as ditch application and hole application can also be used. Top dressing The dosage per mu can be controlled at 20-30kg. It should be noted that it must be applied early and deeply to the dense soil layer of the root system. Otherwise, the effect of superphosphate will be poor. The amount of seed fertilizer per mu should be controlled at about 10kg. External topdressing spraying before and after flowering of crops, it is best to choose calcium superphosphate solution with concentration of 1%-3%. |
| toxicity | see edible calcium dihydrogen phosphate. |
| production method | the feed is dissolved in dry-heat phosphoric acid with calcium hydrogen phosphate, and when the pH value is controlled at about 3.2, calcium dihydrogen phosphate is generated, arsenic remover and heavy metal remover are added, filtered, concentrated, cooled and crystallized, centrifuged, dried and prepared calcium dihydrogen phosphate for feed. Its CaHPO4?2H2O H3PO4 → Ca(H2PO4)2?H2O H2O Bone meal method firstly melts yellow phosphorus into liquid in the molten phosphorus tank, sends it to the combustion hydration tower through the nozzle, and atomizes the phosphorus with compressed air to oxidize and burn the phosphorus to generate phosphorus pentoxide. Sprinkle circulating phosphoric acid at 30~40 ℃ along the tower wall at the top of the tower to cool the phosphorus pentoxide gas and react with water to synthesize phosphoric acid. It is mixed with the calcined and pulverized bone meal according to CaO:P2O5 = 1. After it is cured, it is roughly crushed, dried and crushed to obtain calcium dihydrogen phosphate. Its CaHPO4?2H2O H3PO4 → Ca(H2PO4)2?H2O H2O If the curing material is leached with water, the leach solution is filtered, evaporated, cooled and crystallized, and dried to produce a pure finished product of calcium dihydrogen phosphate. The calcium hydroxide method reacts 2 mol of phosphoric acid with 1mol of calcium hydroxide, and when Ph3.2 is controlled, calcium dihydrogen phosphate is generated. Filtration, evaporation, cooling crystallization, centrifugal separation, fully washed with acetone, air drying, the production of calcium dihydrogen phosphate finished products. Its Ca(OH)2 2H3PO4 → Ca(H2PO4)2?H2O H2O |
| category | toxic substances |
| toxicity classification | low toxicity |
| acute toxicity | oral-rat LD50: 17500 mg/kg; Oral-mouse LD50: 15250 mg/kg |
| flammability hazard characteristics | thermal decomposition discharges toxic phosphorus oxides, calcium oxide smoke |
| storage and transportation characteristics | warehouse low temperature ventilation and drying |
| fire extinguishing agent | water |
Last Update：2024-04-09 15:16:46
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