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Production process of efficient feed-grade monocalcium phosphate by using boiler waste residue for purification of phosphoric acid by wet process

A technology of calcium dihydrogen phosphate and wet-process phosphoric acid, which is applied in the field of phosphorus chemical industry, can solve the problems of low utilization rate of phosphorus resources, high production cost, negative product quality, etc., so as to be beneficial to filtration and separation, reduce direct emissions, and reduce production. cost effect

Active Publication Date: 2016-11-16
SINOCHEM YUNLONG
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  • Claims
  • Application Information

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Problems solved by technology

Although this process can effectively recover the phosphorus resources lost in the precipitation, it can only be closely combined with the two-stage neutralization method to produce calcium feeding process, and the production cost of this process is high, and the utilization rate of phosphorus resources is low, so it has been gradually eliminated by the industry
[0007] The patent application number is 201410818845.1 Chinese patent discloses a wet-process phosphoric acid desulfurization process, which is mainly aimed at the impact of sulfur trioxide in wet-process phosphoric acid on the quality of downstream products such as monoammonium phosphate, diammonium phosphate, and purified phosphoric acid. Proposed to use 31 ~ 35% Ca, 20 ~ 25% P 2 o 5 , 19-26% F fluorine-containing waste residue, although the phosphorus and fluorine in the fluorine-containing waste residue are recycled, but for calcium-feeding products with stricter requirements on fluorine content in the product, the fluorine-containing waste residue will increase after recycling The proportion of fluorine content in phosphoric acid puts forward stricter requirements on the defluorination of the system, which is not suitable for popularization and application
[0008] Aiming at the problem that the product is easy to agglomerate, no relevant and effective patented technology has been disclosed at present. Using the anti-agglomeration technology of related industries, a certain amount of modified additives is usually added to the product, such as the Chinese patent application number 200910307557.9 Organic modifiers such as hydrocarbons, oils, etc., and powdery materials such as calcium silicate, fly ash, etc., but these will undoubtedly increase the content of impurities in the product, which will have a negative impact on product quality, and even be toxic and cannot exist in feed Additives

Method used

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  • Production process of efficient feed-grade monocalcium phosphate by using boiler waste residue for purification of phosphoric acid by wet process
  • Production process of efficient feed-grade monocalcium phosphate by using boiler waste residue for purification of phosphoric acid by wet process
  • Production process of efficient feed-grade monocalcium phosphate by using boiler waste residue for purification of phosphoric acid by wet process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Boiler desulfurization slag indicators:

[0033]

[0034] Phosphoric acid index:

[0035]

[0036] The reaction of boiler desulfurization waste slag with concentrated acid phosphoric acid for the above indicators is based on the active calcium in waste slag and SO in phosphoric acid 3 The molar ratio is 1:1, the reaction temperature is 60°C, the reaction time is 3.0h, and the stirring speed is 8m / s. After the reaction is completed, add an excess of 20% active silicon dioxide and sodium carbonate for defluorination treatment, the reaction temperature is 50°C, the reaction time is 1h, and the finished phosphoric acid is obtained by filtration. The reaction conditions of the finished phosphoric acid and calcium pulp are controlled as pulp moisture 40%, the reaction materials are mixed according to the calcium / phosphorus mass ratio of 0.55, the reaction temperature is 80°C, and the reaction time is 3.0h to obtain MCP slurry. The slurry is granulated and dried in a s...

Embodiment 2

[0038] Boiler desulfurization slag indicators:

[0039]

[0040] Phosphoric acid index:

[0041]

[0042] The reaction of boiler desulfurization waste slag with concentrated acid phosphoric acid for the above indicators is based on the active calcium in waste slag and SO in phosphoric acid 3 The molar ratio is 2:1, the reaction temperature is 70°C, the reaction time is 2h, and the stirring speed is 6m / s. After the reaction is completed, add an excess of 20% active silicon dioxide and sodium carbonate for defluorination treatment, the reaction temperature is 60° C., the reaction time is 2 hours, and the finished phosphoric acid is obtained by filtration. The reaction conditions of the finished phosphoric acid and calcium pulp are controlled as pulp moisture 50%, the reaction materials are mixed with a calcium / phosphorus mass ratio of 0.59, the reaction temperature is 70°C, and the reaction time is 2.0h to obtain MCP slurry. The slurry is granulated and dried in a spray ...

Embodiment 3

[0044] Boiler desulfurization slag indicators:

[0045]

[0046] Phosphoric acid index:

[0047]

[0048] The reaction of boiler desulfurization waste slag with concentrated acid phosphoric acid for the above indicators is based on the active calcium in waste slag and SO in phosphoric acid 3 The molar ratio is 1.5:1, the reaction temperature is 80°C, the reaction time is 0.5h, and the stirring speed is 3m / s. After the reaction is completed, an excess of 20% active silica and sodium carbonate is added for defluorination treatment, the reaction temperature is 70° C., the reaction time is 3 hours, and the finished phosphoric acid is obtained by filtration. The reaction conditions of the finished phosphoric acid and calcium pulp are controlled as pulp moisture 60%, the reaction materials are mixed with a calcium / phosphorus mass ratio of 0.65, the reaction temperature is 60°C, and the reaction time is 1.5h to obtain MCP slurry. The slurry is granulated and dried in a spray ...

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Abstract

The invention discloses a production process of efficient feed-grade monocalcium phosphate by using boiler waste residue for purification of phosphoric acid by wet process. The invention includes the following contents: crushing waste residue from boiler desulfurization, mixing the waste residue with phosphoric acid obtained by concentration of phosphoric acid by wet process for desulfurization reaction, after the reaction, subjecting the phosphoric acid to defluorination treatment, filtering to remove a fluoric phosphoric acid slurry to obtain a finished product of phosphoric acid; mixing and reacting the finished product of phosphoric acid with calcium mineral slurry; and granulating and drying in a spray drying tower, and then conducting rotary vacuum drying to obtain the product. The invention realizes the recycling of boiler desulfurization waste residue, efficiently utilizes active CaO and SiO2 in the waste residue, reduces waste residue treatment costs, reduces consumption for production if a defluorination additive. The obtained feed-grade monocalcium phosphate product has mellow appearance, low internal moisture in the particles, high product purity and no agglomeration, improves the market competitiveness, and achieves cost reduction and efficiency improvement for enterprises.

Description

technical field [0001] The invention belongs to the technical field of phosphorus chemical industry, in particular to a process for producing high-efficiency feed-grade calcium dihydrogen phosphate by using boiler waste residue to purify wet-process phosphoric acid. Background technique [0002] Phosphorus is an important element of life, and phosphate additives are widely used as food and feed additives. Due to the high cost of thermal phosphoric acid, almost all feed-grade calcium phosphate products on the market currently use wet-process phosphoric acid as raw material for production. However, due to the limitation of wet-process phosphoric acid process, there are many impurities in the product, which affects product quality. [0003] With the continuous progress of the industry, the requirements for calcium feeding products will also continue to increase. According to the latest revision of the national standard for feed grade calcium dihydrogen phosphate (GB 22548-2008)...

Claims

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Application Information

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IPC IPC(8): C01B25/32
CPCC01B25/32
Inventor 付全军王力刚魏剑周佩马先林张长明田萍
Owner SINOCHEM YUNLONG
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