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Method for preparing feedstuff grade of defluorination tricalcium phosphate by two times of agglomeration

A defluorinated tricalcium phosphate, feed-grade technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of unqualified product quality, unsatisfactory defluorination effect, affecting product quality, etc., and achieve production cost Low, reducing product quality, avoiding the effect of looping problems

Inactive Publication Date: 2003-05-07
TUOFU PHOSPHOR & CALCIUM KAIYANG GUIZHOU
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AI Technical Summary

Problems solved by technology

Coal is used as fuel, and the phenomenon of "ringing" is easy to occur in the low-temperature section of the kiln, and the coal ash after coal powder combustion will affect the quality of the product; at the same time, the defluorination effect is not ideal, especially for products with high fluorine content. Phosphate rock is used as raw material, and the product quality is difficult to pass
So far, the process of producing defluorinated tricalcium phosphate by secondary sintering has not been reported

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0013] Embodiment Get the phosphate ore produced in Kaiyang area, Guizhou Province as raw material, and its chemical composition (W%) is shown in the following table:

[0014] Ingredient P 2 o 5 CaOSiO 2 F MgO Al 2 o 3 Fe 2 o 3

[0015] Content 35.56 48.24 3.24 3.7 0.74 1.02 2.45

[0016] Composition Na 2 OK 2 O PbCO 2 h 2 O Total

[0017] Content 0.357 0.40 0.003 3.77 0.52 100

[0018] Crush the phosphate rock into phosphate rock sand with a particle size of 0.1-10mm, and send it to the No. 1 rotary kiln of Φ2.2m×50m to burn water gas for calcination. The calcination temperature is controlled and adjusted at 1280-1350℃ depending on the firing zone in the kiln. , while adding 0.35MPa water vapor, continuous feeding and continuous discharging. The rotational speed of the rotary kiln motor is controlled at 720r / min, so that the rotational speed of the rotary kiln is controlled at 40s / r (1 revolution in 40 seconds); the feeding volume per hour is contro...

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Abstract

A process for preparing feed-class defluorinated tricalcium phosplate by sintering twice includes such steps as sintering the high-F phosphorus ore at 1280-1350 deg.c in rotary kiln using water gas as fuel, grinding, proportionally mixing it with sodium carbonate (or sulfate) and lime stone powder, adding hot phosphonic acid, granulating, sintering at 1460-1530 deg.C, and grinding. Advantages: qualified product greater than 98%, less production cost.

Description

technical field [0001] The invention relates to phosphate and feed additives, in particular to a production method of feed grade defluorinated tricalcium phosphate. technical background [0002] Defluorinated tricalcium phosphate is commonly used as a phosphorus and calcium element additive in livestock feed. The original production methods of defluorinated tricalcium phosphate include cyclone furnace melting method and acid heat method (also known as sintering method), and natural gas or heavy oil are mostly used as fuel in foreign countries; some progress has been made in the production of tricalcium phosphate with coal as fuel in China. The technology is constantly coming out, such as Chinese Patent No. 95111505 "Manufacturing Method of High Concentration Defluorinated Phosphate Using Pulverized Coal as Fuel", Chinese Patent Application No. 96118430 "Production Process of Furnace-based Defluorinated Tricalcium Phosphate", Chinese Patent Applicatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/237C01B25/32
Inventor 胡仁学
Owner TUOFU PHOSPHOR & CALCIUM KAIYANG GUIZHOU
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