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Process method for preparing potassium fertilizer by reaction of ammonia evaporation wastewater in soda plant and potash feldspar

A technology of ammonia steaming wastewater and process method, applied in potash fertilizer, application, inorganic fertilizer and other directions, can solve problems such as insufficient treatment, inapplicability, ammonia steaming waste liquid does not participate in high-temperature roasting to extract soluble potash fertilizer, etc., and achieves production requirements. Low cost, significant economic benefits, and good social benefits

Active Publication Date: 2012-08-01
GUANGDONG NANFANG SODA ASH IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This ratio is very small compared to the annual amount of ammonia distillation waste liquid being about 30 to 50 times that of alkali slag, so this method is far from enough to solve the problem that a large amount of ammonia distillation waste liquid needs to be treated in a soda ash plant
[0005] Secondly, the ammonia distillation waste liquid did not participate in the reaction of extracting soluble potassium fertilizer by high-temperature roasting, that is, the CaCl in the ammonia distillation waste liquid 2 and NaCl components are not effectively utilized in the preparation of potash fertilizers
This method fails to effectively utilize the ammonia distillation waste liquid
[0006] In addition, this method needs a large amount of calcium mother liquor as the reaction raw material, that is, if the calcium mother liquor is not prepared before the reaction starts, the method cannot be applied.
[0007] In summary, the process method provided by the invention patent CN1298848A is not suitable for direct treatment and utilization of a large amount of soda ash ammonia distillation waste liquid, and has certain limitations

Method used

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  • Process method for preparing potassium fertilizer by reaction of ammonia evaporation wastewater in soda plant and potash feldspar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The process for preparing potash fertilizer by reacting ammonia distilled waste water from a soda ash plant with potassium feldspar comprises the following steps:

[0045] (1) Get ammonia distillation waste liquid, its main component CaCl 2 The contents of NaCl and NaCl are 100g / L and 50g / L respectively.

[0046] (2) Mix evenly by the ratio of every liter of ammonia distillation waste liquid and 1.5kg potassium feldspar powder.

[0047] (3) Add it to the rotary kiln for roasting, the temperature in the roasting zone is 700°C, and the fired material is discharged from the bottom of the kiln after 4 hours. At this time, the soluble potassium content in the firing material (in K 2 O) is 7%. The fired material can be directly used as potash fertilizer.

Embodiment 2

[0049] The process for preparing potash fertilizer by reacting ammonia distilled waste water from a soda ash plant with potassium feldspar comprises the following steps:

[0050] (1) Get ammonia distillation waste liquid, its main component CaCl 2 The contents of NaCl and NaCl are 110g / L and 40g / L respectively.

[0051] (2) Mix evenly by the ratio of every liter of ammonia distillation waste liquid and 0.75kg of potassium feldspar powder.

[0052] (3) Add it to the rotary kiln for roasting, the temperature of the roasting zone is 1200°C, and the fired material is discharged from the bottom of the kiln after 2 hours. At this time, the soluble potassium content in the firing material (in K 2 O) is 8%. The fired material can be directly used as potash fertilizer.

Embodiment 3

[0054] as attached figure 1 Shown, the processing method of producing potassium fertilizer with the reaction of soda ash plant ammonia distillation waste water and potassium feldspar, comprises the following steps:

[0055] (1) Take ammonia distillation waste liquid, evaporate and concentrate to a solid content of 40-45%, separate and crystallize NaCl, and take waste water.

[0056] (2) According to potassium feldspar powder: ammonia distillation waste liquid solid content (contained CaCl 2 and NaCl): the weight ratio of pulverized coal is 100:15:6 and is added into the mixer and mixed evenly, and then put into the disc ball forming machine to make balls with a diameter of about 15mm.

[0057] (3) Put it into the vertical kiln for roasting, the temperature of the roasting zone is 1000°C, and the fired material is discharged from the bottom of the kiln after 2 hours.

[0058] (4) Crush the calcined material and pass through a 100-mesh sieve, add it to water at a ratio of 1:1,...

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Abstract

The invention provides a process method for preparing a potassic fertilizer by reaction of ammonia evaporation wastewater in a soda plant and potash feldspar, which comprises the following steps of: (1) taking ammonia evaporation waste liquor; (2) uniformly mixing the ammonia evaporation waste liquor and potash feldspar powder in a weight ratio of the total weight of CaCl2 and NaCl contained in the ammonia evaporation waste liquor to the weight of the potash feldspar powder of 0.05-0.2:1; and (3) roasting at the temperature of between 700 and 1,300 DEG C for 2 to 4 hours. The ammonia evaporation waste liquor is taken as a raw material and is changed into treasure, so the long-term influence of a large amount of ammonia evaporation waste liquor in the soda plant on the environment is radically eliminated, the whole production process has no secondary pollution, and the process method has good social benefit. In addition, the ammonia evaporation waste liquor is directly and effectively utilized to prepare water-soluble potassic fertilizers and KCl crystal materials, and has wide application range and obvious economic benefit. The process method has the advantages of simple process, low production cost and suitability for promotion and application.

Description

technical field [0001] The invention relates to a method for utilizing industrial waste water, in particular to a method for preparing potassium fertilizer by reacting ammonia distillation waste liquid of a soda ash plant with potassium feldspar. Background technique [0002] The production of soda ash by Solvay method usually includes the following steps: carbonation of ammonia brine, separation of heavy alkali and recovery of ammonia, wherein recovery of ammonia refers to adding milk of lime to the ammonia distillation system and distilling ammonia with steam. The liquid obtained after the above operation contains 2-3% solid matter, and the liquid obtained by solid-liquid separation is "alkali slag", and its main component is CaCO 3 , CaCl 2 , CaO and Mg(OH) 2 etc., the resulting liquid is "waste ammonia distillation", and its main component is CaCl 2 and NaCl. Usually, about 0.2-0.3 tons of alkali slag and 10-12 tons of ammonia distillation waste liquid are produced f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05D1/00
Inventor 黄志红彭清静秦国忠周剑华曾松峰
Owner GUANGDONG NANFANG SODA ASH IND