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Method of producing triple superphosphate by using raffinate acid resulted from phosphoric acid purification

A technology of heavy superphosphate and raffinate, which is applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., to achieve the effects of rational utilization and smooth process flow

Active Publication Date: 2012-07-18
WENGFU (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process flow proposed by the invention is smooth, which is beneficial to the rational utilization of phosphorus resources, can effectively solve the problem of the use of raffinate phosphoric acid in purified phosphoric acid plants containing more impurities, and meets the requirements of circular economy

Method used

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  • Method of producing triple superphosphate by using raffinate acid resulted from phosphoric acid purification
  • Method of producing triple superphosphate by using raffinate acid resulted from phosphoric acid purification
  • Method of producing triple superphosphate by using raffinate acid resulted from phosphoric acid purification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Raw materials: 1) raffinate phosphoric acid: the chemical composition is as follows (by mass percentage)

[0012] composition P 2 o 5 F SO 4 Fe Mg Al SiO 2 Solid content % 42.0 0.38 0.60 0.55 1.80 0.30 0.02 2.5

[0013] 2) Phosphate rock powder: the chemical composition is as follows (by mass percentage)

[0014]

[0015] Take 50kg of residual phosphoric acid, add 0.02kg of mixed additives, measure it through a flow meter, and feed steam to make the temperature of phosphoric acid reach 60 0 C, then add 25.2kg of phosphate rock powder, mix and react with raffinate phosphoric acid in a mixer for 3min, the slurry flows into the belt forming room for curing, the curing time is 25min, and the curing temperature is 80 0 c. The cutter cuts the solidified fresh heavy superphosphate, breaks it and sends it to the curing warehouse for curing. The curing temperature is 45 0 C. After aging for 12 days, add water to the powdery ma...

Embodiment 2

[0018] Raw materials: 1) raffinate phosphoric acid: the chemical composition is as follows (by weight)

[0019] composition P 2 o 5 F SO 4 Fe Mg Al SiO 2 Solid content % 44.5 0.48 0.80 0.65 2.30 0.35 0.08 3.5

[0020] 2) Phosphate rock powder: the chemical composition is as follows (by weight)

[0021]

[0022] Take 25 kg of residual phosphoric acid, add 0.01 kg of mixed additives, measure through a flow meter, and feed steam to make the temperature of phosphoric acid reach 55 0 C, then add 13.4kg of phosphate rock powder, mix and react with raffinate phosphoric acid in a mixer for 3min, the slurry flows into the belt forming room for curing, the curing time is 25min, and the curing temperature is 80 0 c. The cutter cuts the solidified fresh heavy superphosphate, breaks it and sends it to the curing warehouse for curing. The curing temperature is 45 0 C. After aging for 10 days, the powdery material is granulated by adding w...

Embodiment 3

[0025] Raw materials: 1) raffinate phosphoric acid: the chemical composition is as follows (by weight)

[0026] composition P 2 o 5 F SO 4 Fe Mg Al SiO 2 Solid content % 46.0 0.66 1.2 0.79 2.55 0.47 0.14 6.0

[0027] 2) Phosphate rock powder: the chemical composition is as follows (by weight)

[0028]

[0029] Take 25 kg of residual phosphoric acid, add 0.01 kg of mixed additives, measure through a flow meter, and feed steam to make the temperature of phosphoric acid reach 45 0 C, then add 13.8kg of phosphate rock powder, mix and react with raffinate phosphoric acid in the mixer for 2min, the slurry flows into the belt forming room for curing, the curing time is 20min, and the curing temperature is 80 0 c. The cutter cuts the solidified fresh heavy superphosphate, breaks it and sends it to the curing warehouse for curing. The curing temperature is 40 0 C. After aging for 8 days, the powdery material is granulated by adding w...

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Abstract

The invention discloses a method of producing triple superphosphate by using raffinate acid resulted from phosphoric acid purification. Affinate phosphoric acid serves as a raw material and additives are added. The method comprises steps of introducing steam so as to maintain the raffinate phosphoric acid temperature between 45 DEG C and 650 DEG C through measurement of a flow meter, adding phosphate rock powders in accordance with proportion, reacting the phosphate rock powders with the raffinate phosphoric acid for 2 to 3 minutes in a mixing device, enabling slurry to flow into a belt formation chamber for solidifying at the formation temperature of 80 DEG C for 20-25 minutes, stockpiling and curing the mixture, adding water to powder materials for granulating, drying and sieving the powder materials, and obtaining products. According to the method, the traditional art can be used for recycling phosphoric acid containing high impurities and the product such as triple superphosphate can reach national premium grade standard. The method has a smooth art process, is beneficial to utilize phosphorus resources reasonably, achieves usage of affinate phosphoric acid containing many impurities of purified phosphoric factories, and meets requirements of cycling economy.

Description

technical field [0001] The present invention relates to phosphoric acid, and also relates to double superphosphate, in particular to a method for producing double superphosphate with raffinate from phosphoric acid purification. Background technique [0002] One production method of purified phosphoric acid is to extract phosphoric acid from wet-process phosphoric acid with extractant to obtain industrial-grade and food-grade purified phosphoric acid. In production, the phosphoric acid remaining after extraction is called raffinate. In the process of purifying phosphoric acid production, a large amount of impurities in wet-process phosphoric acid enter into raffinate phosphoric acid, and its main components are: P 2 o 5 42%-46%, Mg 1.80%-2.56%, Fe 0.55%-0.79%, Al 0.30%-0.47%, SiO 2 0.02%-0.14%, SO 4 0.60%-1.2%, F 0.38%-0.66%, solid content 2.5%-6%, and other metal ions. For a long time, the recovery and utilization of raffinate has been a technical problem. Some manu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/32
Inventor 胡宏解田李艳杨丽萍刘旭郭举
Owner WENGFU (GRP) CO LTD
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