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Method for preparing feed calcium hydrophosphate from calcium source in phosphorite

A technology of calcium hydrogen phosphate and calcium dihydrogen phosphate, applied in animal feed, chemical instruments and methods, applications, etc., can solve the problems of phosphogypsum treatment and stockpiling, environmental protection and economic development needs obstacles, and achieve significant economic and social benefits , good economic and social benefits, and the effect of reducing emissions

Inactive Publication Date: 2016-08-24
龚家竹
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the method of using sulfuric acid to decompose phosphate rock to produce feed calcium hydrogen phosphate, there is almost no production method for the utilization of calcium source in phosphate rock by itself.
As mentioned above, the feed calcium hydrogen phosphate production technology using calcium carbonate and wet-process defluorinated phosphoric acid as raw materials is the main production method in the existing European and American countries, while wet-process dilute phosphoric acid and lime milk are used as raw materials for precipitation defluorinated feed phosphoric acid Hydrogen-calcium production technology is the main production method in China; the calcium resource in phosphate rock is not utilized and is taken away with phosphogypsum as a by-product. The problem of phosphogypsum treatment and stockpiling has become a huge need for environmental protection and economic development. obstacle

Method used

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  • Method for preparing feed calcium hydrophosphate from calcium source in phosphorite
  • Method for preparing feed calcium hydrophosphate from calcium source in phosphorite
  • Method for preparing feed calcium hydrophosphate from calcium source in phosphorite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] High-temperature phosphate rock decomposes fluoride to produce calcium phosphate:

[0056] Such as figure 1 Shown: first binder and recovery process water are made into the concentration of 2-5% in binder preparation tank 1; Cross 100 order fineness phosphate rock powder (composition is shown in Table 2) from phosphate rock powder storage hopper 2 and The silicon oxide from the silicon oxide storage hopper 3 (the silicon oxide content in the phosphate rock is higher than 5%, can not be added) is continuously added to the twin-shaft kneading granulator 4 through the speed-regulating metering belt conveyor, where it is mixed with the binder by the binder. The binder configured in the groove and metered by the flow meter is sprayed onto the material in the twin-shaft kneading granulator 4, kneaded, extruded and rolled into granules. The granules granulated from the granulator have a particle size of Φ4-6mm and a moisture content of 10-12%, and are sent into the feeding bi...

Embodiment 2

[0069] Wet process phosphoric acid precipitation defluorination production:

[0070] Such as figure 2As shown, 50,000 kg / h of concentrated phosphoric acid (see Table 4 for composition) is pumped into the silicon dissolution tank 26, and after adding 140 kg / h of active silicon oxide for dissolution, it is sent into the fluorine precipitation tank 27, and fluorine-containing sodium silicate is added 1400kg / h of 20% seed crystal slurry and 3130kg / h of the mixed solution of 17% sodium dihydrogen phosphate and phosphoric acid sent by the alkali dissolution tank were carried out at normal temperature for 60 minutes of stirring precipitation reaction.

[0071] Reaction generates material 54670kg / h in the fluorine precipitation tank 27, is sent in the filter press 28 by filter press pump and carries out solid-liquid separation, obtains filtrate 53420kg / h (44.70% P 2 o 5 , 0.09% F) and 1250kg / h of solid-containing 80% filter cake; the filtrate is the semi-finished product defluoroph...

Embodiment 3

[0079] Feed calcium hydrogen phosphate production:

[0080] Such as image 3 As shown, defluorinated concentrated phosphoric acid (composition table 5) 3770kg / h and finely prepared tricalcium phosphate powder (composition is shown in table 3) 5000kg / h, add high-speed mixer 33 and mix rapidly together, add 800kg / h After h process water, enter the biaxial kneading and granulation reactor 34, and add fine product return materials at the same time, carry out metathesis reaction on the one hand, and knead and granulate by using the biaxial rotary vane on the other hand; the dust-containing gas released by the reaction is The dust that adds water washing recovery wherein of device 35, washing water consumption and adding 800kg / h amount carry out balance regulation.

[0081] After the kneading and granulation reaction is completed, the wet product containing 5-8% enters the rotary drum dryer 36, and is dried in parallel contact with the hot air from the gas combustion furnace. The d...

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Abstract

The invention comprises a method for preparing feed calcium hydrophosphate from a calcium source in phosphorite. According to the method, high-calcium low-phosphorus calcium compounds generated in the process that fluoride in phosphorite is removed through pyrolysis serve as calcium raw materials and most phosphorus raw materials for producing feed calcium hydrophosphate, defluorinated wet process phosphoric acid serves as part of raw materials and is used for producing feed calcium hydrophosphate, and calcium resources in phosphorite are fully used. The method reduces exploitation of limestone and emission of greenhouse gas carbon dioxide, raw material cost of limestone during production is reduced, and the great demand for feed calcium hydrophosphate widely required in the market is also met. The method can reduce the use amount of 60% sulfuric acid used for removing the calcium source in phosphorite for producing wet process phosphoric acid, correspondingly reduces stacking and treatment problems of phosphogypsum byproducts by 60%, and achieves the aims of saving resources, reducing production raw material cost, increasing the resource utilization rate of phosphorite and increasing economic benefits of producers.

Description

technical field [0001] The invention relates to a production method of calcium hydrogen phosphate for feed, in particular to a method for preparing calcium hydrogen phosphate for feed by using its own calcium source in phosphate rock and wet-process phosphoric acid. Background technique [0002] Existing feed calcium hydrogen phosphate (CaHPO 4 2H 2 (2) The production process method is mainly to decompose phosphate rock with sulfuric acid to generate phosphoric acid and phosphogypsum (calcium sulfate), and the calcium source in the phosphate rock is all separated and discarded in the form of calcium sulfate, and the wet-process phosphoric acid obtained is carried out The treatment of defluorination technology, the obtained defluorinated phosphoric acid is reacted with calcium carbonate or lime to produce feed calcium hydrogen phosphate. The main chemical reaction principle is as follows: [0003] Ca 5 F(PO 4 ) 3 +5H 2 SO 4 =3H 3 PO 4 +5CaSO 4 ↓+HF (1) [0004] HF+...

Claims

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Application Information

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IPC IPC(8): C01B25/32A23K20/24
CPCC01B25/32
Inventor 龚家竹
Owner 龚家竹
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