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A kind of preparation method of sulfur-containing heavy calcium

A technology of heavy calcium and sulfur, applied in the direction of superphosphate, phosphate fertilizer, fertilization equipment, etc., can solve the problems that have not been reported yet, and achieve the effect of low cost of technical transformation

Active Publication Date: 2018-07-20
YUNNAN YUNTIANHUA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned patent documents disclose many methods for adding sulfur to ammonium phosphate, but adding sulfur to heavy calcium has not yet been reported.

Method used

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  • A kind of preparation method of sulfur-containing heavy calcium
  • A kind of preparation method of sulfur-containing heavy calcium
  • A kind of preparation method of sulfur-containing heavy calcium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Production of heavy calcium sulfide, such as figure 1 Shown:

[0025] The first step: take sulfur particles according to the ratio of 7% of phosphate rock and add them to the wet mill through a belt and phosphate rock, mix with a certain amount of water for wet grinding to obtain a 200-mesh sieve with a liquid content of 30% sulfur-containing pulp, and then put The slurry is sent to a ceramic filter to remove part of the water to obtain a material with a liquid content of 8%.

[0026] The second step: production of heavy calcium sulfide. The above materials are figure 1 Introduce into a mixer, add phosphoric acid with a concentration of 46%, granulate after the reaction in the reaction tank is completed, dry with hot air below 250°C, crush and sieve to obtain sulfur-containing heavy calcium.

[0027] Table 1 Analysis results of sulfur and phosphate fertilizers

[0028] Indicator name

Embodiment 2

[0030] Step 1: Take sulfur particles with a particle size of ≤1cm, add them to the wet mill through a belt and the phosphate rock with a particle size of ≤1cm according to the proportion of 5% of the phosphate rock, add a certain amount of water to wet grind to get through a 200-mesh sieve, containing Sulfur-containing pulp with a liquid volume of 40%, and then the pulp is transported to a ceramic filter to remove excess water to obtain a material with a liquid content of 15%.

[0031] The second step: production of heavy calcium sulfide. The above materials are figure 1 Introduce into a mixer, add phosphoric acid with a concentration of 46%, granulate after the reaction in the reaction tank is completed, dry with hot air below 250°C, control the moisture content of the outlet material to ≤4.0%, and obtain sulfur-added heavy calcium after crushing and screening.

[0032] Table 2 Analysis results of sulfur-containing heavy calcium

[0033] Indicator name

Embodiment 3

[0035] Step 1: Take sulfur particles at a ratio of 3% and add them to the wet mill through a belt and phosphate rock, add a certain amount of water to wet mill to obtain a sulfur-containing pulp that has passed a 200-mesh sieve and has a liquid content of 50%, and then transport the pulp To the thickener, remove excess moisture to obtain a material with a liquid content of 20%.

[0036] The second step: production of heavy calcium sulfide. The above materials are figure 1 Introduce into a mixer, add phosphoric acid with a concentration of 46%, granulate after the reaction in the reaction tank is completed, dry with hot air below 250°C, crush and sieve to obtain heavy calcium sulfide.

[0037] Table 3 Analysis results of sulfur-containing heavy calcium

[0038]

[0039]

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Abstract

The invention discloses a preparation method of sulfur-containing heavy calcium. The preparation method comprises carrying out wet grinding on phosphate rock and elemental sulfur particles, conveying the ground product into a ceramic filter or a thickener, removing a part of water, conveying the materials into a slurry process-based heavy calcium production device, feeding phosphoric acid into the device, carrying out reaction preparation, carrying out granulation and carrying out drying to obtain a finished product. The preparation method utilizes the existing phosphate rock wet grinding device and the heavy calcium production device to produce fertilizer containing two or more nutrients such as phosphor and sulfur, does not change the original technology route and provides a low-cost product up-gradation method for the traditional device. The product contains uniform elemental sulfur, greatly reduces material returning frequency and reduces dust explosion possibility.

Description

technical field [0001] The invention belongs to the technical field of phosphate fertilizer production, and in particular relates to a preparation method of sulfur-containing heavy calcium. Background technique [0002] Heavy calcium, also known as heavy superphosphate, is mainly produced in China by chemical formation and slurry. The traditional phosphate fertilizer plant produces sulfur fertilizer by spraying liquid sulfur on the ammonified material or wrapping a layer of liquid sulfur on the product. These methods are not suitable for adding heavy calcium during the synthesis process. Due to the difference in the process, the liquid sulfur spraying during the reaction process will cause the molten sulfur to agglomerate due to the drop in temperature, and cannot be uniformly dispersed in the material; if the molten sulfur is sprayed in the granulation process, it will lead to uneven sulfur content in the product , resulting in an increase in unqualified batches. Another ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05B1/04
Inventor 匡家灵师永林张应虎杨跃华李志祥舒艺周陈红琼杨心师
Owner YUNNAN YUNTIANHUA
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