CN102162111A - Preparation method of potassium gold citrate for gold plating - Google Patents
Preparation method of potassium gold citrate for gold plating Download PDFInfo
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- CN102162111A CN102162111A CN 201110059797 CN201110059797A CN102162111A CN 102162111 A CN102162111 A CN 102162111A CN 201110059797 CN201110059797 CN 201110059797 CN 201110059797 A CN201110059797 A CN 201110059797A CN 102162111 A CN102162111 A CN 102162111A
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- gold
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- potassium
- citric acid
- water
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Abstract
The invention discloses a preparation method of potassium gold citrate for gold plating, which basically solves the problems that the product prepared by the existing preparation method has poor uniformity and is easy to segregate and agglomerate in the processes of transportation and preservation. The preparation method is technically characterized by comprising the following preparation processes of: adding powdered potassium gold cyanide, water and powdered acidic potassium citrate into mixing equipment and uniformly mixing, wherein the weight ratio of the water to the acidic potassium citrate is (0.01-0.12):1; sieving the mixture with a 10-mesh sieve; drying the sieved mixture; and sieving the dried mixture with a 20-mesh sieve. The optimal weight ratio of the water to the acidic potassium citrate is (0.06-0.08):1. The product prepared by the preparation method disclosed by the invention has good uniformity and can not segregate and agglomerate in the processes of transportation and preservation, and the gold loss is small in the process of preparation.
Description
Technical field
The present invention relates to a kind of preparation method who is used for gold-plated golden salt, particularly a kind of preparation method who is used for the citric acid gold potassium of electrogilding or chemical gilding mainly is applicable to acidity and neutral gold plating technology.
Background technology
Gold-platedly in industry, be widely used.Current application craft of gilding the most widely is acid and neutral gold-plated.Usually use potassium cyanaurite (being commonly called as golden salt) in the acid and neutral gold plating technology as main salt (see " table and treatment process complete works " the 290th page of Liu Yubo for details and edit, in May, 1996 first version).In the existing craft of gilding, consumption according to gold is added potassium cyanaurite, yet in the gold-plated production of reality, because the consumption of electrode reaction, the washing loss of gold-plated workpiece causes gold and Citrate trianion in the plating bath simultaneously consumption to be arranged all, and the use potassium cyanaurite is main salt, can only replenish the consumption of gold merely, the consumption of Citrate trianion needs to replenish in addition in the plating bath.Because commercially available Citrate trianion kind is single, its pH value and plating bath pH value differ bigger, still need after adding Citrate trianion usually and proofread and correct the pH value of plating bath, and be cumbersome.In addition, potassium cyanaurite belongs to violent in toxicity, brings inconvenience for production, the security control of enterprise.
The contriver is in order to solve above-mentioned deficiency, and the patent of invention of having studied and having declared publication number and be CN1995472A " is used for gold-plated citric acid gold salt ", in order to substitute potassium cyanaurite, now obtains to use widely in gold-plated industry in craft of gilding.Be actually used in gold-plated citric acid gold salt and mostly be sylvite, be i.e. citric acid gold potassium.Citric acid gold potassium is the mixture of potassium cyanaurite and citric acid acid sylvite.Citric acid acid sylvite can be expressed as K
3C
6H
5O
7KC
6H
8O
7, K in the formula
3C
6H
5O
7Be Tripotassium Citrate, C
6H
8O
7Be citric acid, k is a molar ratio, 0≤k≤5.
Citric acid gold potassium is the mixture of potassium cyanaurite and citric acid acid sylvite, the preparation of mixture is simple originally, but the major ingredient of citric acid gold potassium is a gold, gold is valuable, Gold Content by this product on the gold-plated usage of trade is valuated, so it is very tight that gold-plated industry requires the product uniformity coefficient of citric acid gold potassium, product is inhomogeneous will cause sample examination the time, and Gold Content analytical results both sides are inconsistent, cause buying and selling dispute.In order to improve the uniformity coefficient of product, successively studied following method:
Direct mixing method: potassium cyanaurite is directly mixed in mixing equipment with citric acid acid sylvite.This method is the easiest, but products obtained therefrom uniformity coefficient instability.In order to improve the uniformity coefficient of product, once used dissimilar mixing machines, and preferred mixing condition but effect is all dissatisfied.Analyze its major cause, be that potassium cyanaurite proportion is bigger, citric acid acid sylvite proportion is less, and the product that mixes segregation in transportation, preservation process makes product uniformity coefficient instability.
Add the water hybrid system: in potassium cyanaurite, add less water, add citric acid acid sylvite again, mix.The less water that adds has increased the cohesive force between the crystal, can prevent segregation.The shortcoming of this method is that amount of water is difficult to appropriately: add water very little, and anti-segregation weak effect, it is many slightly to add water, the product caking.The degree of agglomeration of product also with shelf time of product, factors such as storage temperature are relevant, make troubles to use, the user is dissatisfied.
Pressed disc method: potassium cyanaurite and citric acid acid sylvite are mixed the back use the tabletting machine compressing tablet, can prevent the product segregation.Its shortcoming is that production efficiency is low, and the product loss is big.
Comminution granulation: potassium cyanaurite and citric acid acid sylvite are mixed the back granulation.Its shortcoming is that the product loss is big, and direct yield is low.
The citric acid gold potassium product is valuable, and millesimal gold promptly has considerable value, needs the research appropriate preparation method, satisfies the requirement of producing with the user.
Summary of the invention
The objective of the invention is for a kind of preparation method of citric acid gold potassium for gilding is provided, fundamentally solve existing preparation method's products obtained therefrom uniformity coefficient problem poor, the easy piece that hardens partially in transportation, preservation process, its products obtained therefrom good evenness, in transportation, not segregation in the preservation process, do not lump, and the gold waste is little in the preparation process.
Technical scheme of the present invention is: the preparation method of this citric acid gold potassium for gilding, its technical essential is: preparation process is: add Powdered potassium cyanaurite, water, Powdered citric acid acid sylvite in mixing equipment, the weight ratio of water and citric acid acid sylvite is (0.01～0.12): 1, mix; Mixture is crossed 10 mesh sieves; Mixture after sieving is dried; Mixture after the oven dry is crossed 20 mesh sieves.
The optimum range of the weight ratio of water and citric acid acid sylvite is (0.06～0.08): 1.
The positively effect of advantage of the present invention and generation thereof is: the present invention adds water in Powdered potassium cyanaurite and Powdered citric acid acid sylvite can prevent the product segregation.The water that adds is saturated by citric acid acid sylvite and potassium cyanaurite in mixing process, becomes saturated solution, and this solution has viscosity, can improve bonding force between the crystal, prevents segregation.Moisture evaporation during oven dry, citric acid acid sylvite soluble in water and potassium cyanaurite are separated out with crystal state again, and the crystal of separating out and original crystal are adhered to one another, staggered, have served as the binding agent between original crystal grain, increase the bonding force between crystal, thereby can prevent segregation.
The purpose of crossing 10 mesh sieves before the oven dry is to eliminate the agglomerate that may form in the mixing process, improves the homogeneity of product, product caking during oven dry, show and produce bonding force between crystal, 20 mesh sieves are crossed in the oven dry back, and purpose is the bulk that is generated when eliminating oven dry, improve the outward appearance and the homogeneity of product.
The citric acid gold potassium stable performance of this law preparation, the not segregation of not luming can prolonged preservation, has uniformity coefficient preferably.The product Gold Content sample examination result that obtains is stable in institute, and the deviation between the set(ting)value can be controlled in 0.3%, is greatly improved than direct mixing method, only be under the equal conditions direct mixing method chemical examination deviation 1/3rd, obtain gold-plated user's general favorable comment.Gold wastage rate in the preparation process can be controlled in 0.05%, and these wastage rate have reduced gold-plated production cost of products, and the present invention has been applied to actual production, have good promotion prospect.
Embodiment
Now describe the present invention.The preparation method of citric acid gold potassium for gilding of the present invention mainly may further comprise the steps:
At first, in mixing equipment, add Powdered potassium cyanaurite KAu (CN)
2, water, Powdered citric acid acid sylvite K
3C
6H
5O
7﹒ k
1C
6H
8O
7, and mix, wherein, the weight ratio of water and citric acid acid sylvite is (0.01～0.12): 1;
Then, three's mixture is crossed 10 mesh sieves, eliminate the agglomerate that may form in the mixing process;
Next, the mixture after sieving is dried;
Mixture after will drying is at last crossed 20 mesh sieves, eliminates the bulk that is generated when drying, and improves the outward appearance and the homogeneity of product.Finally obtain citric acid gold potassium product K Au (CN)
2(K
3C
6H
5O
7﹒ k
1C
6H
8O
7) k
2.
The optimum range of the weight ratio of water and citric acid acid sylvite is (0.06～0.08): 1.
The citric acid gold potassium of embodiment 1 preparation 2kg Gold Content 40.0%
To volume is the high purity potassium cyanaurite 1172.0g that adds Gold Content 68.3% in 5 liters the three-dimensional mixer, water 50ml, citric acid acid sylvite 828.0g; Potassium cyanaurite, citric acid acid sylvite are all crossed 40 mesh sieves.Middling speed was mixed 20 minutes, whole mistake 10 mesh sieves of gained mixture, and at drying tray middle berth lamellar, 90 ℃ of oven dry; After the cooling, crushing caking made and all crossed 20 mesh sieves, weigh, Gold Content is 40.0% citric acid gold potassium 1999.4g, direct yield 99.97%.
Embodiment 2 preparation 5kg Gold Content 51.0%PH values are 5.1 citric acid gold potassium
To volume is that to add Gold Content in 10 liters the three-dimensional mixer be 68.3% high purity potassium cyanaurite 3735.0g, water 88ml, hydrogen citrate dipotassium 1267.0g, potassium cyanaurite, hydrogen citrate dipotassium are all crossed 40 mesh sieves, and middling speed was mixed 18 minutes, whole mistake 10 mesh sieves of gained mixture, in drying tray, be paved into thin layer, 90 ℃ of oven dry, after the cooling, the crushing caking, make and all cross 20 mesh sieves, weigh, get the citric acid gold potassium 5001.0g of Gold Content 51.0%, direct yield 99.98%.
Claims (2)
1. the preparation method of a citric acid gold potassium for gilding, it is characterized in that: preparation process is: add Powdered potassium cyanaurite, water, Powdered citric acid acid sylvite in mixing equipment, the weight ratio of water and citric acid acid sylvite is (0.01～0.12): 1, mix; Mixture is crossed 10 mesh sieves; Mixture after sieving is dried; Mixture after the oven dry is crossed 20 mesh sieves.
2. the preparation method of citric acid gold potassium for gilding according to claim 1 is characterized in that: the optimum range of the weight ratio of water and citric acid acid sylvite is (0.06～0.08): 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110059797 CN102162111A (en) | 2011-03-14 | 2011-03-14 | Preparation method of potassium gold citrate for gold plating |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110059797 CN102162111A (en) | 2011-03-14 | 2011-03-14 | Preparation method of potassium gold citrate for gold plating |
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| CN102162111A true CN102162111A (en) | 2011-08-24 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN109553520A (en) * | 2018-11-29 | 2019-04-02 | 泰州市欣港电子材料有限公司 | A kind of citric acid gold potassium production technology |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1995472A (en) * | 2006-12-19 | 2007-07-11 | 张东山 | Gold citrate for gold plating |
-
2011
- 2011-03-14 CN CN 201110059797 patent/CN102162111A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1995472A (en) * | 2006-12-19 | 2007-07-11 | 张东山 | Gold citrate for gold plating |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN109553520A (en) * | 2018-11-29 | 2019-04-02 | 泰州市欣港电子材料有限公司 | A kind of citric acid gold potassium production technology |
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Application publication date: 20110824 |