CN103290439A - Novel environment-friendly gold plating material potassium aurous citrate and preparation method thereof - Google Patents
Novel environment-friendly gold plating material potassium aurous citrate and preparation method thereof Download PDFInfo
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- CN103290439A CN103290439A CN2012100399845A CN201210039984A CN103290439A CN 103290439 A CN103290439 A CN 103290439A CN 2012100399845 A CN2012100399845 A CN 2012100399845A CN 201210039984 A CN201210039984 A CN 201210039984A CN 103290439 A CN103290439 A CN 103290439A
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- citric acid
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Abstract
The invention relates to a novel environment-friendly gold plating material potassium aurous citrate and a preparation method thereof. The molecular formula of the potassium aurous citrate is K2C6H5O7Au. The preparation method is that: the potassium aurous citrate is prepared by a reaction of chloroauric acid, malononitrile and potassium citrate in water. The potassium aurous citrate contains no cyanide, and is non-toxic. Gold plating effect of the potassium aurous citrate is excellent.
Description
Technical field:
The present invention relates to a kind of inferior golden potassium of gold-plated citric acid with environmental protection and preparation method, belong to technical field of chemistry.
Background technology:
In gold-plated industry, during plating, the most enterprises of China select for use inorganic electrogilding salt----potassium cyanaurite as gold-plated main salt, solidity to corrosion and coating according to workpiece, the characteristic of plating piece is prepared acid gold-plated or alkaline gold plating solution again,, to satisfy the requirement to processing condition.
Existing craft of gilding, it is gold-plated to mainly contain prussiate, and sulphite is gold-plated, and Citrate trianion is gold-plated etc., and except sulphite was gold-plated, other gold-plated potassium cyanaurite KAu (CN) 2 that all adopt was as gold-plated main salt.When alkaline cyaniding is gold-plated, potassium cyanide too high levels in the electroplate liquid of this craft of gilding, toxicity is bigger, and most of enterprises seldom use.Citrate trianion is gold-plated, and to belong to slightly acidic gold-plated, uses morely in gold-plated industry, and it also is as containing golden main salt with potassium cyanaurite.When producing gold-plated main salt potassium cyanaurite, one kilogram of potassium cyanaurite of every production will consume 1.2-1.8 kilogram highly toxic substance potassium cyanide.According to relevant, China's electroplating industry will consume gold more than hundred tons every year, and the usage quantity of potassium cyanide is about 300 tons.When electroplating, gold is reduced into metal ion and is plated on the object that is plated, and the potassium cyanide that plays complexing action is unbound state and remains in the waste plating solution and be discharged, and has more than 300 ton prussiate to be discharged in the physical environment approximately every year like this.The toxicity of prussiate is extremely strong, its lethal quantity LD50=1mg/kg, and the prussiate that sucks 0.1g just can the causing death.Potassium cyanaurite KAu (CN) 2 contains cyanogen (CN-) 17-23%, wherein contains the free CN-of 0.1-1%, its lethal quantity LD50=17mg/kg, be highly toxic substance, when electroplating, be mixed with electroplating solution after total CN-content be 2200mg/L, CN-content is 500-1089mg/L in the raffinate after the plating, even it is higher, the discharging of this cyanide wastewater causes serious murder by poisoning and pollution to environment, makes some rivers, the river, the fish in lake, the shrimp disappearance, electroplating industry has become one of primary pollution source of China.
Summary of the invention:
The invention provides a kind of gold-plated with the inferior golden potassium of nontoxic novel material one citric acid of no cyanogen.
For reaching above purpose, the molecular formula of the inferior golden potassium of this citric acid is: K2C6H5O7Au.
The present invention also proposes a kind of above-mentioned gold-plated preparation method with the inferior golden potassium of citric acid, comprises the steps:
A. gold is dissolved in the chloroazotic acid, distillation obtains the solid hydrochloro-auric acid.
B. under normal pressure, hydrochloro-auric acid joins in 50 water of spending and makes it to dissolve fully.
C. above-mentioned solution is warmed up to 80 degree, the inferior golden potassium solution of citric acid is added regulate pH value to 7, add edta solution, add propane dinitrile solution again, the pH value of mixing solutions is transferred to 8-9, reaction is finished, and obtains lurid solution.
D. this solution is moved in the water cooler, feed the frozen water cooling, kept about 6 hours at the 0-5 degree, occur lurid precipitation on the water cooler bottle wall, remove by filter moisture, obtain pulverulent solids.
E. lurid xln is moved in the baking oven, 50 degree were finished product in dry 10 hours under the normal pressure.
Lemon provided by the invention says that the advantage of inferior golden potassium is: it is nontoxic not contain cyanogen, can not cause personnel's injury and the pollution of environment.This product is the electronics industrial chemicals of cleaning, can replace traditional electronics industrial chemicals potassium cyanaurite fully.
The preparation method, example one:
At normal temperatures and pressures, 5 gram hydrochloro-auric acids dissolve in the 400ML water, and 80 degree heat up, add Tripotassium Citrate and transfer pH value to 7, add the 20ML aqueous solution of the ethylenediamine tetraacetic acid (EDTA) of 0.6 gram, add the propane dinitrile of 4 grams and the potassium citrate solution of 5 grams again, intensification 75 degree kept temperature 24 hours.Reaction is finished, and gets faint yellow solid 6 grams.
Example two:
At normal temperatures and pressures, 10 gram hydrochloro-auric acids dissolve in the 1000ML water, and 80 degree heat up, add Tripotassium Citrate and transfer pH value to 7, add the 50ML aqueous solution of the ethylenediamine tetraacetic acid (EDTA) of 2 grams, add the propane dinitrile of 10 grams and the potassium citrate solution of 10 grams again, intensification 85 degree kept temperature 30 hours.Reaction is finished, and gets faint yellow solid 13 grams.
Claims (2)
1. the inferior golden potassium of the citric acid of the environmental protection of a gold-plated usefulness, it is characterized by: the molecular formula of the inferior golden potassium of this citric acid is: K2C6H5O7Au.
2. the method for the inferior golden potassium of the citric acid for preparing gold-plated usefulness as claimed in claim 1, its feature is as follows:
A. gold is dissolved in the chloroazotic acid, distillation obtains the solid hydrochloro-auric acid.
B. under normal pressure, hydrochloro-auric acid joins in 50 water of spending and makes it to dissolve fully.
C. above-mentioned solution is warmed up to 80 degree, the inferior golden potassium solution of citric acid is added regulate pH value to 7, add edta solution, add propane dinitrile solution again, the pH value of mixing solutions is transferred to 8-9, reaction is finished, and obtains lurid solution.
D. this solution is moved in the water cooler, feed the frozen water cooling, kept about 6 hours at the 0-5 degree, occur lurid precipitation on the water cooler bottle wall, remove by filter moisture, obtain pulverulent solids.
E. lurid xln is moved in the baking oven, 50 degree were finished product in dry 10 hours under the normal pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100399845A CN103290439A (en) | 2012-02-22 | 2012-02-22 | Novel environment-friendly gold plating material potassium aurous citrate and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100399845A CN103290439A (en) | 2012-02-22 | 2012-02-22 | Novel environment-friendly gold plating material potassium aurous citrate and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
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| CN103290439A true CN103290439A (en) | 2013-09-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012100399845A Pending CN103290439A (en) | 2012-02-22 | 2012-02-22 | Novel environment-friendly gold plating material potassium aurous citrate and preparation method thereof |
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| CN (1) | CN103290439A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104514021A (en) * | 2013-09-27 | 2015-04-15 | 江涛 | Novel cyanogen-free material for gold plating namely ethylene diamine-critic acid-gold and preparation method thereof |
| CN108350575A (en) * | 2015-12-18 | 2018-07-31 | 罗门哈斯电子材料有限责任公司 | Golden electroplating solution |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101671839A (en) * | 2009-08-31 | 2010-03-17 | 三门峡恒生科技研发有限公司 | Citric acid gold potassium for gilding and preparation method thereof |
-
2012
- 2012-02-22 CN CN2012100399845A patent/CN103290439A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101671839A (en) * | 2009-08-31 | 2010-03-17 | 三门峡恒生科技研发有限公司 | Citric acid gold potassium for gilding and preparation method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104514021A (en) * | 2013-09-27 | 2015-04-15 | 江涛 | Novel cyanogen-free material for gold plating namely ethylene diamine-critic acid-gold and preparation method thereof |
| CN108350575A (en) * | 2015-12-18 | 2018-07-31 | 罗门哈斯电子材料有限责任公司 | Golden electroplating solution |
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Application publication date: 20130911 |
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