Unlock instant, AI-driven research and patent intelligence for your innovation.

Preparation method of efficient cyanide-free gold water

A cyanogen gold water, high-efficiency technology, applied in chemical instruments and methods, inorganic chemistry, gold compounds, etc., can solve the problems of low purity, intense gold water reaction, and high loss, to simplify the process, improve concentration and yield, reduce loss and The effect of impurities

Inactive Publication Date: 2020-12-22
深圳润福金技术开发有限公司
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a high-efficiency preparation method of cyanide-free gold water, which solves the technical problems of intense reaction of gold water in the prior art, difficulty in tail gas recovery, low yield, low purity and high loss, and achieves a simplified process , the technical effect of reducing loss and impurities and increasing concentration and yield

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A method for producing highly efficient cyanogen-free gold water, comprising the steps of:

[0034] (1) Press 1.000Kg of gold material / gold bars (99.99%) into thin slices, and cut the pressed thin slices into small pieces of 3x3cm-3x5cm;

[0035] (2) Transfer the above-mentioned small gold pieces into a special reaction kettle, add nitric acid and hydrochloric acid according to the ratio of gold: nitric acid: hydrochloric acid = 1Kg: 0.8L: 2.4L, and the reaction time in the water bath is 1H at the reaction temperature of the water bath at 80°C;

[0036] (3) After the reaction of the gold flakes is complete, add 3.2L of ultrapure water, and cool naturally for 1H;

[0037] (4) After cooling, slowly add concentrated ammonia water in the reaction kettle to adjust the pH of the solution to 10, and a large amount of yellow precipitate will appear at this time;

[0038] (5) release the above-mentioned neutralized solution, wash and filter twice under vacuum filtration conditi...

Embodiment 2

[0041] A method for producing highly efficient cyanogen-free gold water, comprising the steps of:

[0042] (1) Press 2.000Kg of gold material / gold bars (99.99%) into thin slices, and cut the pressed thin slices into small pieces of 3x3cm-3x5cm;

[0043] (2) Transfer the above-mentioned small gold pieces into a special reaction kettle, add nitric acid and hydrochloric acid according to the ratio of gold: nitric acid: hydrochloric acid = 2Kg: 1.6L: 5.2L, and the reaction time in the water bath is 2H at the reaction temperature of the water bath at 75°C;

[0044] (3) After the reaction of the gold flakes is complete, add 7.0L of ultrapure water, and cool naturally for 1.5H;

[0045] (4) After cooling, slowly add concentrated ammonia water in the reaction kettle to adjust the pH of the solution to 9.5, and a large amount of yellow precipitate will appear at this time;

[0046] (5) release the above-mentioned neutralized solution, wash and filter 3 times under vacuum filtration co...

Embodiment 3

[0049] A method for producing highly efficient cyanogen-free gold water, comprising the steps of:

[0050] (1) Press 3.000Kg of gold material / gold bar (99.99%) into thin slices, and cut the pressed thin slices into small pieces of 3x3cm-3x5cm;

[0051] (2) Transfer the above-mentioned small gold pieces into a special reaction kettle, add nitric acid and hydrochloric acid according to the ratio of gold: nitric acid: hydrochloric acid = 3Kg: 2.5L: 7.5L, and the reaction time in the water bath is 2H at the reaction temperature of the water bath at 75°C;

[0052] (3) After the reaction of the gold flakes is complete, add 10.0L of ultrapure water, and cool naturally for 1.0H;

[0053] (4) After cooling, slowly add concentrated ammonia water in the reaction kettle to adjust the pH of the solution to 10.0, and a large amount of yellow precipitate will appear at this time;

[0054] (5) release the above-mentioned neutralized solution, wash and filter 3 times under vacuum filtration con...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a preparation method of efficient cyanide-free gold water. The preparation method comprises the following steps: (1) gold material tabletting: tabletting a gold material into thin sheets, and shearing the thin sheets into small gold sheets of 3*3cm - 3*5cm; (2) water bath reaction: transferring the small gold sheets in the step (1) into a reaction kettle, adding nitric acidand hydrochloric acid according to the adding ratio of gold to nitric acid to hydrochloric acid being 1Kg: 0.8-1.0L:2.0-2.5 L, and reacting for 1-3H at the water bath reaction temperature of 60-100 DEG C; (3) adding water, wherein after the reaction is completed, ultrapure water with the same volume is added, and natural cooling is conducted for 1-3H; (4) neutralizing the solution: after cooling,slowly adding concentrated ammonia water into the reaction kettle to adjust the pH value of the solution to 8-10; (5) vacuum filtration: carrying out vacuum filtration on the neutralized solution 1-3times or more to obtain mud-shaped yellow precipitate; and (6) stirring and dissolving: transferring the yellow precipitate in the step (5) into a complexing solution with a constant temperature of 65-75 DEG C, continuously stirring to dissolve the yellow precipitate, and cooling to obtain the gold water required by cyanide-free gold plating. The method is simple in process, low in loss, few in impurity, high in concentration and high in yield.

Description

technical field [0001] The invention relates to the field of gold water preparation, in particular to a preparation method of cyanide-free gold water, especially a preparation method of high-efficiency cyanide-free gold water. Background technique [0002] With the continuous popularization of 3D cyanide-free electro-gold technology, efficient gold water production methods have become one of the key and urgent research topics of various R&D teams. The production of gold water is the first step in the development and application of the cyanide-free process. The production of gold water is to dissolve solid gold into an ionic gold through chemical methods, and it can exist stably in a specific solution. [0003] The production of gold water in the prior art is divided into four steps. The first step is to add gold into aqua regia or aqua regia, and dissolve the gold completely under stirring; the second step is to add alkaline salt to precipitate gold ions; the third step is t...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/48C22B11/00C22B3/06C22B3/02C22B3/44C22B3/22C01G7/00
CPCC25D3/48C22B11/04C22B3/06C22B3/02C22B3/44C22B3/22C01G7/00Y02P10/20
Inventor 李凯成
Owner 深圳润福金技术开发有限公司