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A kind of processing method of waste concentrated phosphoric acid

A treatment method, concentrated phosphoric acid technology, applied in chemical instruments and methods, phosphorus compounds, calcium/strontium/barium sulfate, etc., can solve the problems of unfavorable large-scale production, large amount of waste liquid, waste of resources, etc., to protect nature The effect of ecological environment, increasing benefit and convenient operation

Active Publication Date: 2018-05-18
四川高绿平环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this invention uses anion and cation columns for exchange in the process, which has high cost and produces a large amount of waste liquid in the production process, which wastes resources and is not conducive to large-scale industrial production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: A method for processing waste concentrated phosphoric acid, which includes the following steps:

[0029] S1. Acid adjustment: Add waste dilute phosphoric acid with a mass percentage concentration of 5% to waste concentrated phosphoric acid with a mass percentage concentration of 60% to adjust the acid until the concentration of the waste phosphoric acid after adjustment is 16%. The volume ratio of concentrated phosphoric acid and waste dilute phosphoric acid is 3:1;

[0030] S2. Coarse desulfurization: pump the waste phosphoric acid after acid adjustment into the crude desulfurization reactor, and add CaCO 3 Carry out rough desulfurization to obtain a solid-liquid mixture, CaCO 3 The dosage is such that no precipitation can occur in the crude desulfurization reactor, and the temperature of the materials in the crude desulfurization reactor is controlled to 50°C;

[0031] S3. Coarse desulfurization filter press: the solid-liquid mixture obtained in step S2 is sent to...

Embodiment 2

[0035] Embodiment 2: A method for processing waste concentrated phosphoric acid, which includes the following steps:

[0036] S1. Acid adjustment: Add waste dilute phosphoric acid with a mass percentage concentration of 10% to waste concentrated phosphoric acid with a mass percentage concentration of 70% for acid adjustment until the concentration of the waste phosphoric acid after acid adjustment is 20%. The volume ratio of concentrated phosphoric acid and waste dilute phosphoric acid is 5:1;

[0037] S2. Coarse desulfurization: pump the waste phosphoric acid after acid adjustment into the crude desulfurization reactor, and add CaCO 3 Carry out rough desulfurization to obtain a solid-liquid mixture, CaCO 3 The dosage is such that no precipitation can occur in the crude desulfurization reactor, and the temperature of the materials in the crude desulfurization reactor is controlled to 60°C;

[0038] S3. Coarse desulfurization filter press: the solid-liquid mixture obtained in step S2 ...

Embodiment 3

[0042] Embodiment 3: A processing method of waste concentrated phosphoric acid, which includes the following steps:

[0043] S1. Acid adjustment: Add waste dilute phosphoric acid with a mass percentage concentration of 8% to waste concentrated phosphoric acid with a mass percentage concentration of 65% to adjust the acid until the concentration of the waste phosphoric acid after adjustment is 18%. The volume ratio of concentrated phosphoric acid and waste dilute phosphoric acid is 4:1;

[0044] S2. Coarse desulfurization: pump the waste phosphoric acid after acid adjustment into the crude desulfurization reactor, and add CaCO 3 Carry out rough desulfurization to obtain a solid-liquid mixture, CaCO 3 The dosage is such that no precipitation can occur in the crude desulfurization reactor, and the temperature of the materials in the crude desulfurization reactor is controlled to 55°C;

[0045] S3. Coarse desulfurization filter press: the solid-liquid mixture obtained in step S2 is sent ...

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PUM

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Abstract

The invention discloses a processing method of waste concentrated phosphoric acid, and belongs to the technical field of three wastes comprehensive utilization. The processing method comprises following steps: acid regulation, coarse desulfuration, coarse desulfuration filter pressing, fine desulfurization, fine desulfurization filter pressing, and filter residue mixing. The processing method can be used for processing waste concentrated phosphoric acid generated in production process of all industries so as to obtain fertilizer-grade phosphoric acid and sulfates for industrial application; resources are saved, and at the same time waste materials are changed valuable materials; the natural ecological environment is protected; benefit is increased; the processing method is simple; operation is convenient; cost is low; and the processing method is suitable for industrialized mass production.

Description

Technical field [0001] The invention relates to a method for processing chemical waste, in particular to a method for processing waste concentrated phosphoric acid, and belongs to the technical field of comprehensive utilization of three wastes. Background technique [0002] Phosphoric acid is a relatively common acid, mainly used in the manufacture of phosphate fertilizers; phosphoric acid is often used in chemical polishing of metals; in addition, the use of phosphoric acid in the nitration of aromatic compounds can play a role in adjusting the adjacent contrast. After a period of use, due to impurities The increase of phosphate will affect the catalysis of polishing or nitrification and form waste acid. The composition of the waste acid is complex, which is not conducive to recycling. Generally speaking, pure waste phosphoric acid can be recycled and used in fertilizers, and it is also relatively mature. The method is mainly used to produce ammonium phosphate, calcium phosphat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/237C01F11/46
CPCC01B25/2377C01F11/46C01F11/462
Inventor 蒲江
Owner 四川高绿平环境科技有限公司