Comprehensive utilization method of chemical polishing waste phosphoric acid

A technology of chemical polishing and waste phosphoric acid, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of large mud production and high landfill treatment costs, achieve high utilization rate, reduce landfill costs, and reduce production costs. The effect of simple process

Active Publication Date: 2009-06-17
SHENZHEN SHENTOU ENVIRONMENT TECH CO LTD
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  • Abstract
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Problems solved by technology

[0004] The invention mainly aims at the problems of large sludge production and high cost of landfill treatment during the neutralization process of chemical polishing waste phosphoric acid, and provides a method that can not only comprehensively utilize chemical polishing waste phosphoric acid, generate secondary economic benefits, but also enable chemical Comprehensive utilization method of chemical polishing waste phosphoric acid discharged after polishing waste phosphoric acid is treated and its TP reaches the standard

Method used

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  • Comprehensive utilization method of chemical polishing waste phosphoric acid
  • Comprehensive utilization method of chemical polishing waste phosphoric acid
  • Comprehensive utilization method of chemical polishing waste phosphoric acid

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Take chemical polishing waste phosphoric acid 100mL, its relative density is 1.42, wherein total phosphorus content is 175g / L, aluminum content 18g / L, Ni content 328mg / L, add 300mL water to above-mentioned chemical polishing waste phosphoric acid, make its relative density dilute to 1.1, then slowly add milk of lime with a weight percentage of 20%, react to pH=2.2, filter with suction, discard the filter residue, continue to add milk of lime to the filtrate to adjust the pH to 2.8, and filter with suction, the filter residue is fertilizer grade calcium hydrogen phosphate , the above two steps control the reaction temperature to 50-80°C, continue to adjust the pH of the filtrate to 6.8 with lime milk, control the reaction temperature to 50-60°C, and perform suction filtration to obtain feed grade calcium hydrogen phosphate.

[0027] The obtained filter residue solid was dried at 120° C., and the mass of each solid was determined to be 17.9 g, 11.7 g, and 73.3 g respective...

Embodiment 2

[0031] Take chemical polishing waste phosphoric acid 100mL, its relative density is 1.67, and phosphorus content is 195g / L, dilute above-mentioned chemical polishing waste phosphoric acid to relative density and be 1.12, slowly add the milk of lime that weight percentage is 10%, control reaction temperature 50-80°C, react to pH=2.8, filter with suction, the dry weight of the filter residue is 40.4g, continue to neutralize the filtrate with milk of lime, control the reaction temperature at 50-60°C, neutralize to pH=6.8, filter with suction, and filter the residue Dry weight 64.9g. The weight percentage of each composition in each solid is as follows:

[0032]

[0033] In the above-mentioned second stage of precipitated solids, the phosphorus (P) content and calcium (Ca) content can both reach the national feed grade calcium hydrogen phosphate standard.

[0034] Adjust the pH of the filtrate obtained in the second step to 9.5 with milk of lime, and precipitate out. The preci...

example 3

[0036] Take chemical polishing waste phosphoric acid 100mL, its relative density is 1.37, wherein total phosphorus content is 125g / L, aluminum content is 6.4g / L, SO 4 2-Content 47.6g / L, containing black suspended solids, add 300mL water to the above chemical polishing waste phosphoric acid to dilute its relative density to 1.09, then slowly add milk of lime with a weight percentage of 20%, react until pH = 2.2, Suction filtration, the filter residue is discarded, continue to add lime milk to the filtrate to adjust the pH to 2.8, and suction filtration, the obtained filter residue is fertilizer grade calcium hydrogen phosphate, the above two steps keep the reaction temperature at 50-80 ° C, and the obtained filtrate is adjusted to the pH with lime milk To 6.8, control the reaction temperature to 50-60°C, filter with suction, and the obtained filter residue is feed grade calcium hydrogen phosphate.

[0037] The obtained filter residue solid was dried at 120° C., and the mass of...

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Abstract

The invention relates to a method for comprehensively utilizing chemically polished waste phosphoric acid, which comprises the following steps: firstly, diluting the chemically polished waste phosphoric acid until the relative density is between 1.1 and 1.2, slowly adding lime cream, controlling the reaction temperature to be between 50 and 80 DEG C, adjusting the pH value to be between 2.8 and 3.0, and filtering to obtain deposit, namely fertilizer calcium hydrophosphate; and secondly, continuously adding the lime cream into filtrate obtained in the first step, controlling the reaction temperature to be between 50 and 60 DEG C and the pH value of the reaction endpoint to be between 6.5 and 6.8, and filtering to obtain deposit, namely feed-grade calcium hydrophosphate. The method mainly produces phosphorus-containing products in a form of calcium hydrophosphate, generates a small quantity of sludge during reaction and even does not generate the slurry, reduces the landfill cost, achieves secondary economic benefit, has simple production process, low cost and high utilization rate of phosphorus, simultaneously realizes emission meeting the standard of TP, and is easy to realize mass production.

Description

technical field [0001] The invention relates to a comprehensive utilization method of chemical polishing waste phosphoric acid. Background technique [0002] The metal surface chemical polishing liquid uses phosphoric acid as the main component, adding a certain proportion of sulfuric acid, nitric acid and other substances to improve the polishing effect of aluminum and other metal surfaces. After long-term use of the polishing liquid, it will lead to the accumulation of aluminum components, making it impossible to repeat. use. The general way to deal with this kind of chemical polishing waste phosphoric acid is to add lime to neutralize and landfill the waste residue. This method will produce a large amount of phosphorus-containing sludge, increase the cost of landfill, and even cause public nuisance. In view of the high content of phosphoric acid in this waste liquid, it is of great significance to study how to improve the comprehensive utilization of waste phosphoric ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/32
Inventor 陈志传宋少华毛谙章廖蔚峰吴瑞富慎义勇
Owner SHENZHEN SHENTOU ENVIRONMENT TECH CO LTD
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