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Method for recycling ceramic-grade iron phosphate for multi-metal dangerous waste

A hazardous waste and polymetallic technology, applied in the direction of non-metallic elements, chemical instruments and methods, phosphorus compounds, etc., can solve the problems of complex components, bacterial inactivation, and great harm, and achieve simple equipment and operation methods and high added value , low cost effect

Active Publication Date: 2018-09-28
重庆太锦环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Surface treatment Phosphating wastewater treatment sludge has high phosphate content and heavy metals such as copper, nickel and zinc. The composition is complex and harmful. Biological methods can easily lead to inactivation of bacteria. High consumption and difficult to separate and recover copper, nickel and zinc

Method used

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  • Method for recycling ceramic-grade iron phosphate for multi-metal dangerous waste
  • Method for recycling ceramic-grade iron phosphate for multi-metal dangerous waste
  • Method for recycling ceramic-grade iron phosphate for multi-metal dangerous waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Raw material analysis

[0026] Take phosphating wastewater to treat sludge and Fe-containing 3+ Sludge is calculated as Fe by mass percentage 3+ : PO 4 3- =1.2~1.5 ingredients, mix uniformly, analyze its metal content with flame atomic absorption spectrophotometer, analyze phosphate radical content with visible spectrophotometry, analyze water content with weight loss method, the results are shown in Table 1, the present embodiment Fe 3+ : PO 4 3- = 1.24.

[0027] Table 1 Sludge composition list

[0028]

[0029] (2) Acid leaching experiment

[0030] Take 500g of the above-mentioned mixed sludge in a 2000mL beaker, add 1000mL of water, put mechanical stirring into the beaker, adjust the rotating speed to 300r / min to make the sludge slurry, and then slowly add 98% sulfuric acid to the slurry, and the sludge gradually Dissolve, add sulfuric acid until the sludge no longer reacts, continue to stir for 30 minutes, and keep the pH value at about 0.5 to complet...

Embodiment 2

[0045] (1) Raw material analysis

[0046] Take phosphating wastewater to treat sludge and Fe-containing 3+ Sludge is calculated as Fe by mass percentage 3+ :PO 4 3- =1.2~1.5 ingredients, mix uniformly, analyze its metal content with flame atomic absorption spectrophotometer, analyze phosphate radical content with visible spectrophotometry, analyze water content with weight loss method, the results are shown in Table 4, the present embodiment Fe 3+ :PO 4 3- = 1.45.

[0047] Table 4 Sludge composition list

[0048]

[0049] (2) Acid leaching experiment

[0050] Take 500g of the above-mentioned mixed sludge in a 2000mL beaker, add 1000mL of water, put mechanical stirring into the beaker, adjust the rotating speed to 300r / min to make the sludge slurry, and then slowly add 98% sulfuric acid to the slurry, and the sludge gradually Dissolve, add sulfuric acid until the sludge no longer reacts, continue to stir for 30 minutes, and keep the pH value at about 0.6 to completely ...

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Abstract

The invention relates to a method for recycling ceramic-grade iron phosphate for multi-metal dangerous waste. The method comprises the steps that phosphorization wastewater treatment sludge containingmulti-metal is matched with sludge containing Fe3+, acid pickling is conducted, iron phosphate sediment is generated under pH of 2.0-2.5 and separated from other kinds of metal, dissolution and reduction are conducted, and a small number of copper ions are removed; the pH is adjusted to 3.5-3.8, and a small amount of chromium is removed through a chromium phosphate form; finally, hydrogen peroxide is added for generating iron phosphate whit Fe3+ and phosphate groups, the pH of diluted acid is adjusted to 2.1-2.5, stirring and filtering are conducted, and filter cake is ceramic-grade iron phosphate. According to the method, a full-wet-method process is adopted, heating is not needed, the equipment and the operation method are simple, and the cost is low; the medical agent is monotonous inkind and environmentally friendly; the extracted ceramic-grade iron phosphate products are high in additional value and can be directly applied to raw materials of industries such as ceramics, adhesive, pigment and chemical engineering.

Description

technical field [0001] The invention belongs to the field of waste water, sewage or sludge treatment, and relates to a method for recovering ceramic-grade iron phosphate from polymetallic hazardous waste. Background technique [0002] In machinery, steel and other industries, phosphating surface treatment technology is used to make the protective layer of mechanical parts. In the process, a large amount of pickling and phosphating waste liquid will be generated. In addition to a large amount of phosphate, phosphating wastewater also contains heavy metal ions such as copper, nickel, zinc, and acid-base substances. It is usually treated by chemical precipitation. , Most of the phosphate radicals and various heavy metal ions in the wastewater can be precipitated and removed, and after filtration, the phosphating wastewater treatment sludge is obtained. [0003] At present, the problem of phosphate pollution in my country's waters is very serious, and the scope of ecological da...

Claims

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Application Information

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IPC IPC(8): C01B25/37
CPCC01B25/375
Inventor 贾智慧王修海
Owner 重庆太锦环保科技有限公司
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