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Regeneration method of aqueous rust remover

A rust remover, water-based technology, applied in the field of regeneration of water-based rust remover, can solve the problems of difficult separation of active components, danger, poor operating efficiency, etc.

Inactive Publication Date: 2014-11-05
SASAKI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When this method is used in the regeneration of water-based rust removers containing aliphatic lower mercaptans, in addition to the difficulty in separating unreacted and reacted active ingredients, an exothermic reaction occurs due to neutralization heat when adding alkali, which is accompanied by operational problems. dangerous
There are also problems that lumps (agglomerated lumps of suspended matter) are formed, copper precipitation is difficult to form, and work efficiency is poor.
Therefore, it is not sufficient to use the method described in Patent Document 3

Method used

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  • Regeneration method of aqueous rust remover
  • Regeneration method of aqueous rust remover
  • Regeneration method of aqueous rust remover

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] Example 1 (regeneration after patina removal)

[0074] Experimental results of regeneration of copper waste liquid 1

[0075] In this example, the experiment was carried out using a waste liquid in which copper was dissolved at a concentration of 0.5% by weight as the waste liquid after copper rust removal. Refined sulfuric acid is added dropwise to the waste liquid to lower the pH to the acidic region until the copper is 100% removed, and the complex of thioglycolic acid and copper is precipitated and formed.

[0076] from figure 1 From the results shown, almost 100% of the copper precipitates when the pH of the waste liquid is around 5, and 100% of the copper precipitates when the pH of the waste liquid is 4.0 to 4.5. The effective components of the supernatant and the copper precipitated components can be separated. In addition, at pH 4, 80% or more of the sulfur component contained in thioglycolic acid, which is an active ingredient for rust removal, remains.

[...

Embodiment 2

[0081] Example 2 (regeneration after rust removal)

[0082] For iron-containing waste liquid, form Fe which is more stable than the compound with water-based rust remover 2+ Complexes are removed by extraction in the organic phase.

[0083] Experimental results of regeneration of iron waste liquid 1

[0084] Dissolve copper waste liquid with a concentration of 0.117% in a water-based copper descaling agent with a pH of 7.7, add hydrochloric acid, set the pH at around 6, and mix it with PC-88A diluted with kerosene at a volume ratio of 1:1 (10cm 3 : 10cm 3 ) mixed and stirred for phase separation. Thereafter, the water phase was taken out, PC-88A kerosene diluent was added, and the mixing and stirring process was repeated. Such as figure 2 The results shown, as the extraction operation increases, the Fe 2+ The extraction rate increased, 71.5% for the 1st extraction operation, 84.9% for the 2nd extraction operation, and 94.6% for the 4th extraction operation. On the othe...

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Abstract

The present invention provides a novel regeneration method of an aqueous rust remover which comprises aliphatic low thiol. The regeneration method of the aqueous rust remover which comprises aliphatic low thiol is characterized by comprising the following steps: (a) a step 1 of generating the deposit comprising copper through adding acid into the aqueous rust remover after copper rust elimination, (b) a step 2 for removing the deposit through solid liquid separation, and (c) a step 3 of adjusting the pH value of the liquid obtained through eliminating the deposit. The regeneration method is also characterized by comprising the following steps: (A) a step 1 of dividing the aqueous rust remover after steel rust elimination through adding an organic solvent comprising acid phosphate and mixing, and extracting steel component in the organic phase; and (B) a step 2 of eliminating the organic phase.

Description

technical field [0001] The present invention relates to a method for regenerating an aqueous rust remover (also referred to as "waste") used for rust removal. Background technique [0002] Conventionally, water-based rust removers containing aliphatic lower mercaptans as active ingredients are known. The above-mentioned water-based rust remover can be used for removing copper rust (Patent Document 1) or iron-tin (Sn) rust (Patent Document 2) formed on the surface of the object to be treated. Then, dilute the liquid phase part with the waste liquid after use and discard it, and at the same time, the mud in the solid phase part will be buried after incineration. [0003] In view of the recent increase in awareness of environmental protection and the demand for resource conservation, it is desired to separate metal from the above-mentioned aqueous descaling agent and regenerate it as an aqueous descaling agent. If such regeneration is possible, it is highly efficient in that ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23G1/36
Inventor 芝田隼次高田慎一
Owner SASAKI CHEM