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A producing method of a phosphorus-calcium highly-water-soluble fertilizer

A technology for water-soluble fertilizers and production methods, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of poor water solubility and water-soluble phosphorus, affecting environmental balance, aggravating water pollution, etc., and achieving low water-insoluble matter. , The effect of increasing the main content and reducing the insoluble matter

Active Publication Date: 2015-05-06
GUIZHOU CHANHEN CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Due to the limitations of the production process, the above-mentioned products have poor water solubility and water-soluble phosphorus. During agricultural use, there is a large part of unreacted phosphate rock and part of citrate-soluble phosphorus. 2 o 5 It is difficult to be absorbed by crops. On the one hand, it causes the loss of phosphorus. To achieve the same fertilizer effect, it needs to invest twice or three times the fertilizer; on the other hand, the phosphorus fertilizer that has not been absorbed in time enters rivers and lakes along with rainwater eutrophication, aggravated water pollution, and greatly affected the balance of the environment

Method used

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  • A producing method of a phosphorus-calcium highly-water-soluble fertilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] Phosphoric acid hemihydrate is produced from phosphate rock in the Mabian area of ​​Sichuan, and is added as a cheap ore. The quality indicators of acid ore for reaction are shown in Table 1:

[0082] Table 1 raw material index

[0083] index P 2 o 5 CaO Fe 2 o 3 MgO al 2 o 3 F SO4 As K Na Phosphoric acid hemihydrate 40.96 0.06 0.37 0.69 0.06 0.73 1.61 0.0031 0.036 0.022 Phosphate Rock 33.89 47.72 0.51 1.47 0.42 3.2 2.28 0.0026 0.088 0.42

[0084] The temperature of the phosphoric acid hemihydrate used for the reaction is raised to 60-80°C in the circulation heater, and the treatment agent 1 (prepared in advance, the composition is similar to the thick slag, the same below) (the addition amount of each substance in the embodiment is as long as within the range of the amount described in the specific embodiment), react for 30 minutes, detect that the CaO content of the slurry is 1% to 2%, and filter; ...

Embodiment 2

[0086] Use phosphate rock in Fuquan area, Guizhou to produce phosphoric acid hemihydrate, and use this ore to add as cheap ore. The quality index of acid ore for reaction is as shown in Table 2:

[0087] Table 2 raw material index

[0088] index P 2 o 5 CaO Fe 2 o 3 MgO Al 2 o 3 F SO4 As K Na Phosphoric acid hemihydrate 42.53 0.14 0.36 1.38 0.17 0.84 1.72 0.0025 0.035 0.026 Phosphate Rock 30.34 43.98 0.58 0.94 0.62 2.76 2.08 0.0031 0.09 0.22

[0089] The temperature of phosphoric acid hemihydrate for reaction is raised to 60-80°C in the circulation heater, adding treatment agent 1 (prepared in advance), reacting for 30 minutes, and detecting that the CaO content of the slurry is 1.5%-2%, and filtering; the filter residue is used A small amount of clean water was washed in countercurrent three times, and the filtrate acid was heated to 60-80°C, and the treatment agent 2 sodium sulfide was added, reacted for ...

Embodiment 3

[0091] Phosphoric acid hemihydrate is produced from phosphate rock in Shangzhou, Sichuan, and added as a cheap ore. The quality indicators of acid ore for reaction are shown in Table 3:

[0092] Table 3 raw material index

[0093] index P2O5 CaO Fe 2 o 3 MgO al 2 o 3 F SO4 As K Na Phosphoric acid hemihydrate 39.56 0.08 0.53 1.2 0.46 1.23 1.53 0.002 0.037 0.016 Phosphate Rock 31.12 44.72 2.4 1.62 1.98 2.46 4.73 0.0031 0.14 0.082

[0094] The implementation process is as in Example 2, and the product indicators are shown in Table 5.

[0095] Table 4. PCA Quality Indicators of Enterprise Acidic Water-Soluble Fertilizers (Internal Control)

[0096] serial number project index 1 Exterior White or other very light monochrome 2 Total P 2 o 5 % 53—54 3 Water solubility% ≥98 4 Free phosphoric acid (as phosphoric acid) ≥25 5 PH value ＞2 6 Calcium Ca% ≥9 7 ...

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Abstract

The invention discloses a producing method of a phosphorus-calcium highly-water-soluble fertilizer and belongs to the technical field of fertilizers. The method includes steps of: a) adding a calcium-containing compound into a raw material that is wet-process phosphoric acid, reacting, filtering, adding a sulfide into the acid solution after filtration, reacting and filtering; b) subjecting the acid solution treated by the step a) and a raw material that is powdered rock phosphate to an acidolysis reaction, with the using amount of phosphoric acid being more than 500% of a theoretical reaction amount; c) thickening by maintaining the temperature of the slurry after acidolysis; d) transferring the supernatant liquid after thickening into a cooling and crystallizing tank, cooling and crystallizing, and performing solid liquid separation; e) adding water into filter residue of the step d) to prepare slurry, and thickening by maintaining the temperature; and f) transferring the supernatant liquid after thickening to a dryer having high-temperature air streams, and drying to obtain a product that is the phosphorus-calcium highly-water-soluble fertilizer. The method can control the content of water insoluble compounds of the product to be less than 3% and the main content to be higher than 98%, and is low in cost, high in phosphorus utilization rate and less in residue discharge.

Description

technical field [0001] The invention belongs to the technical field of fertilizers, and in particular relates to a method for producing fertilizers with high phosphorus and calcium water-soluble properties. Background technique [0002] Water-soluble fertilizer (WaterSolubleFertilizer, WSF), referred to as water-soluble fertilizer, is a multi-component compound fertilizer that can be completely dissolved in water. It has good water solubility and no residue, and can be quickly dissolved in water. Compared with fertilizers and other varieties, water-soluble fertilizers have obvious advantages, and are easier to be absorbed by crops, and their absorption and utilization rate is relatively high. More importantly, they can be applied to agricultural facilities such as sprinkler irrigation and drip irrigation, so as to realize the simultaneous application of water and fertilizer. Fertilizer, water and fertilizer are integrated to achieve the efficiency of saving water, fertilizer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/32C05B11/10
Inventor 吴生平李进雷波毛诚邹建
Owner GUIZHOU CHANHEN CHEM CO LTD
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