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Method for producing raw material for sulfur-based compound fertilizer from waste phosphoric acid

A technology of sulfur-based compound fertilizer and waste phosphoric acid, applied in the application, fertilization device, fertilizer mixture and other directions, can solve the problems of high recycling cost, waste of phosphorus-containing resources, difficult treatment, etc. Absorbent, easy-to-absorb effect

Active Publication Date: 2019-11-22
史丹利化肥当阳有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] When producing high-concentration phosphoric acid, such as producing phosphoric acid with a mass percentage of 75% or 85%, or producing refined diammonium phosphate, the general process is to purify ordinary phosphoric acid, usually using P 2 o 5 Concentrate and purify 20% phosphoric acid, and the remaining slag after concentration and purification contains P 2 o 5 The content is generally between 15% and 18%. The slag acid contains various impurities, such as sulfate, magnesium ions, sodium ions, etc., which cannot be used in the production of high-grade monoammonium phosphate and diammonium phosphate, and the recycling cost is high. Generally, it can only be used to produce low-grade monoammonium phosphate or superphosphate, and the benefit is relatively low. If it is returned to the system, the impurities contained in it are difficult to deal with, which will affect production and affect the grade of phosphoric acid due to the presence of various impurity ions.
If it is treated as waste, because it contains a certain amount of P 2 o 5 , will cause a waste of phosphorus-containing resources, and the processing cost will increase significantly; if it is used to produce low-grade monoammonium phosphate, there is no profit margin in terms of production efficiency
Therefore, the treatment of waste phosphoric acid is a major problem in the phosphoric acid purification system and process.

Method used

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  • Method for producing raw material for sulfur-based compound fertilizer from waste phosphoric acid
  • Method for producing raw material for sulfur-based compound fertilizer from waste phosphoric acid
  • Method for producing raw material for sulfur-based compound fertilizer from waste phosphoric acid

Examples

Experimental program
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Effect test

example 1

[0040] Select No. 1 waste phosphoric acid and No. 1 phosphate rock powder for reaction treatment, and the specific calculation is as follows:

[0041] 1. Select 10kg of phosphoric acid, according to the detection value H 2 SO 4 =4.88%, then the content of sulfuric acid in waste phosphoric acid is:

[0042] 10*4.88%=0.488Kg

[0043] Select 1Kg phosphate rock powder, the required amount of sulfuric acid M is:

[0044] S1=(CaO)×98 / 56=1×41.24%×98÷56=0.7217Kg

[0045] S2=(MgO)×98 / 40=1×2.73%×98÷40=0.0669Kg

[0046] S3=(Al 2 o 3 )×98 / 102=1×2.22%×98÷102=0.0213Kg

[0047] M=S1+S2+S3=0.7217Kg+0.0669Kg+0.0213Kg=0.8099Kg

[0048] The phosphate rock powder that needs to be added to 10kg of waste phosphoric acid is selected as:

[0049] 0.488Kg÷0.8099Kg=0.60Kg

[0050] 2. The produced phosphoric acid P 2 o 5 The content is:

[0051] The conversion rate is 97.5%, the washing rate is 99%, and the mechanical loss is 3%:

[0052] 0.60Kg×27.12%×97.5%×99%×(100-3)%=0.1524Kg

[0053]...

example 2

[0056] Select No. 1 waste phosphoric acid and No. 2 phosphate rock powder for reaction treatment, and the specific calculation is as follows:

[0057] 1. Select 10kg of phosphoric acid, according to the detection value H 2 SO 4 =4.88%, then the content of sulfuric acid in waste phosphoric acid is:

[0058] 10×4.88%=0.488Kg

[0059] Select 1Kg phosphate rock powder, the required amount of sulfuric acid M is:

[0060] S1=(CaO)×98 / 56=1×45.9%×98÷56=0.8033Kg

[0061] S2=(MgO)×98 / 40=1×2.64%×98÷40=0.0647Kg

[0062] S3=(Al 2 o 3 )×98 / 102=1×0.95%×98÷102=0.0091Kg

[0063] M=S1+S2+S3=0.8033Kg+0.0647Kg+0.0091Kg=0.877Kg

[0064] The phosphate rock powder that needs to be added to 10kg of waste phosphoric acid is selected as:

[0065] 0.488Kg÷0.877Kg=0.556Kg

[0066] 2. The produced phosphoric acid P 2 o 5 The content is:

[0067] The conversion rate is 97.5%, the washing rate is 99%, and the mechanical loss is 3%:

[0068] 0.556Kg×29.81%×97.5%×99%×(100-3)%=0.1551Kg

[0069] ...

example 3

[0072] Select No. 1 waste phosphoric acid and No. 3 phosphate rock powder for reaction treatment, and the specific calculation is as follows:

[0073] 1. Select 10kg of phosphoric acid, according to the detection value H 2 SO 4 =4.88%, then the content of sulfuric acid in waste phosphoric acid is:

[0074] 10*4.88%=0.488Kg

[0075] Select 1Kg phosphate rock powder, the required amount of sulfuric acid M is:

[0076] S1=(CaO)×98 / 56=1×46.02%×98÷56=0.8054Kg

[0077] S2=(MgO)×98 / 40=1×1.25%×98÷40=0.0306Kg

[0078] S3=(Al 2 o 3 )×98 / 102=1×1.42%×98÷102=0.0136Kg

[0079] M=S1+S2+S3=0.8054Kg+0.0306Kg+0.0136Kg=0.8496Kg

[0080] The phosphate rock powder that needs to be added to 10kg of waste phosphoric acid is selected as:

[0081] 0.488Kg÷0.8496Kg=0.574Kg

[0082] 2. The produced phosphoric acid P 2 o 5 The content is:

[0083] The conversion rate is 97.5%, the washing rate is 99%, and the mechanical loss is 3%:

[0084] 0.574Kg×32.11%×97.5%×99%×(100-3)%=0.1726Kg

[008...

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Abstract

The invention discloses a method for producing a raw material for a sulfur-based compound fertilizer by utilizing waste phosphoric acid. The method comprises the following steps: 1) detecting the content of P2O5 in waste phosphoric acid and the content of P2O5 in ground phosphate rock, and calculating the amount of the ground phosphate rock needed for reducing the sulfuric acid content of the waste phosphoric acid to 0.0335 g / mL; 2) adding the waste phosphoric acid into a reaction tank, and when the waste phosphoric acid is heated to 75 DEG C or above, adding the ground phosphate rock into thereaction tank according to the proportion calculated in the step 1) for reaction; and 3) carrying out solid-liquid separation after the reaction in the step 2) is completed, wherein the obtained liquid is phosphoric acid adopted as the raw material for producing the sulfur-based compound fertilizer. When the method is used for producing the sulfur-based compound fertilizer, the ground phosphate rock is added into the waste phosphoric acid, on one hand, sulfuric acid in the waste phosphoric acid is used for acidolysis of the waste phosphoric acid to reduce the content of sulfate ions, and on the other hand, effective phosphorus components in the ground phosphate rock can be acidolyzed to increase the phosphorus content of the waste phosphoric acid.

Description

technical field [0001] The invention belongs to the fields of environmental protection and fertilizers, in particular to a method for producing raw materials for sulfur-based compound fertilizers by using waste phosphoric acid. Background technique [0002] When producing high-concentration phosphoric acid, such as producing phosphoric acid with a mass percentage of 75% or 85%, or producing refined diammonium phosphate, the general process is to purify ordinary phosphoric acid, usually using P 2 o 5 Concentrate and purify 20% phosphoric acid, and the remaining slag after concentration and purification contains P 2 o 5 The content is generally between 15% and 18%. The slag acid contains various impurities, such as sulfate, magnesium ions, sodium ions, etc., which cannot be used in the production of high-grade monoammonium phosphate and diammonium phosphate, and the recycling cost is high. Generally, it can only be used to produce low-grade monoammonium phosphate or superph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G1/00C05G3/04
CPCC05G1/00
Inventor 彭永博刘旭辉林华经小榆张思杨
Owner 史丹利化肥当阳有限公司