CN103374735A - Novel environment-friendly gold-plated material-citric acid pinchbeck and preparation method thereof - Google Patents
Novel environment-friendly gold-plated material-citric acid pinchbeck and preparation method thereof Download PDFInfo
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- CN103374735A CN103374735A CN 201210116565 CN201210116565A CN103374735A CN 103374735 A CN103374735 A CN 103374735A CN 201210116565 CN201210116565 CN 201210116565 CN 201210116565 A CN201210116565 A CN 201210116565A CN 103374735 A CN103374735 A CN 103374735A
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Abstract
The invention relates to novel environment-friendly gold-plated material-citric acid pinchbeck and a preparation method thereof. The molecular formula of the citric acid pinchbeck is C6H7O7Au. The preparation method comprises the following steps of: enabling auric chloride acid to react with malononitrile and potassium citrate in water to prepare the citric acid pinchbeck. The citric acid pinchbeck disclosed by the invention has the characteristics of no cyanogen and no toxicity and has a good gold-plating effect.
Description
Technical field:
The present invention relates to a kind of inferior gold 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 inorganic electrogilding salt---and-potassium cyanaurite is 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 larger, and most enterprises seldom uses.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 approximately more than 300 ton prussiate to be discharged in the physical environment 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%, the free CN-that wherein contains 0.1-1%, its lethal quantity LD50=17mg/kg, it is highly toxic substance, total CN-content is 2200mg/L be mixed with electroplating solution when electroplating after, CN-content is 500-1089mg/L in the raffinate after the plating, even 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 usefulness without the inferior gold of the nontoxic novel material of cyanogen-citric acid.
For reaching above purpose, the molecular formula of the inferior golden potassium of this citric acid is: C6H7O7Au.
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. mentioned solution is warmed up to 80 degree, chlorauric acid solution 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, pass into 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. this solid is soluble in water, acid adjustment to 2 is cooled to minus 20 degrees, separates out light yellow solid
F. 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 gold is: it is nontoxic not contain cyanogen, can not cause personnel's injury and the pollution of environment.This product is the electronic chemical raw material of cleaning, can replace traditional electronic chemical raw material potassium cyanaurite fully.Lemon of the present invention says inferior gold because dry temperature difference may contain different crystal water.
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 again the propane dinitrile of 4 grams and the potassium citrate solution of 5 grams, intensification 75 degree kept temperature 24 hours.Reaction is finished, and acid adjustment to pH value is 2 again, 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 again the propane dinitrile of 10 grams and the potassium citrate solution of 10 grams, intensification 85 degree kept temperature 30 hours.Reaction is finished, and acid adjustment to pH value is 2 again, gets faint yellow solid 13 grams.
Claims (2)
1. the citric acid of the environmental protection of a gold-plated usefulness is inferior golden, it is characterized by: molecular formula of the inferior gold of this citric acid is: C6H7O7Au.
2. the method for the inferior gold 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. mentioned solution is warmed up to 80 degree, chlorauric acid solution 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, pass into 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. this solid is soluble in water, acid adjustment to 2 is cooled to minus 20 degrees, separates out light yellow solid.
F. lurid xln is moved in the baking oven, 50 degree were finished product in dry 10 hours under the normal pressure.
G. the inferior gold of this citric acid is soluble in water, add alkali, obtain such as the inferior golden sodium of citric acid the inferior golden calcium of citric acid, the inferior golden potassium of citric acid, the salt such as the inferior Jin Mei of citric acid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210116565 CN103374735A (en) | 2012-04-20 | 2012-04-20 | Novel environment-friendly gold-plated material-citric acid pinchbeck and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201210116565 CN103374735A (en) | 2012-04-20 | 2012-04-20 | Novel environment-friendly gold-plated material-citric acid pinchbeck and preparation method thereof |
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| CN103374735A true CN103374735A (en) | 2013-10-30 |
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| CN 201210116565 Pending CN103374735A (en) | 2012-04-20 | 2012-04-20 | Novel environment-friendly gold-plated material-citric acid pinchbeck and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103588637A (en) * | 2013-11-22 | 2014-02-19 | 铜陵金典电子科技有限公司 | Preparation method of potassium dihydrogen citrate |
| CN104975306A (en) * | 2014-04-08 | 2015-10-14 | 灵宝欣宏金属科技有限公司 | Preparation method of composite gold potassium beta-citrate for gold plating |
-
2012
- 2012-04-20 CN CN 201210116565 patent/CN103374735A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103588637A (en) * | 2013-11-22 | 2014-02-19 | 铜陵金典电子科技有限公司 | Preparation method of potassium dihydrogen citrate |
| CN103588637B (en) * | 2013-11-22 | 2015-10-28 | 铜陵金典电子科技有限公司 | A kind of preparation method of potassium dihydrogen citrate |
| CN104975306A (en) * | 2014-04-08 | 2015-10-14 | 灵宝欣宏金属科技有限公司 | Preparation method of composite gold potassium beta-citrate for gold plating |
| CN104975306B (en) * | 2014-04-08 | 2017-07-28 | 灵宝欣宏金属科技有限公司 | Plate the preparation method that gold is combined gold salt with β citric acid gold potassiums |
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Application publication date: 20131030 |