1. A method for judging the concentration and crystallization end point of potassium aurous cyanide is characterized in that: the method comprises the following steps:

the method comprises the following steps: firstly, putting a potassium aurous cyanide crystallization solution into a beaker through a liquid taking tube;

step two: then cutting a proper amount of aluminum sheet by a knife, weighing by a balance, and putting the aluminum sheet into a sample box by tweezers;

step three: placing the beaker filled with the potassium aurous cyanide crystallization solution on an alcohol lamp bracket, and heating the beaker by an alcohol lamp;

step four: then the worker puts the aluminum sheet in the sample box into a beaker containing the potassium aurous cyanide crystallization solution through tweezers and reacts for a period of time.

Step five: filtering the solution obtained after the reaction in the step four through a filter funnel;

step six: washing the filter funnel in the fifth step by using an aqueous solution;

step seven: and then observing substances on the inner side of the filter funnel through a magnifying glass, wherein if the inner side of the filter funnel has elemental Au, the gold potassium cyanide crystallization solution is not completely concentrated and crystallized, and if the inner side of the filter funnel does not have elemental Au, the gold potassium cyanide crystallization solution is completely concentrated and crystallized to reach the crystallization end point.

2. The method for judging the end point of the concentration and crystallization of potassium aurous cyanide according to claim 1, wherein the method comprises the following steps: the capacity of the potassium aurous cyanide crystallization solution in the step one is 50 ml.

3. The method for judging the end point of the concentration and crystallization of potassium aurous cyanide according to claim 1, wherein the method comprises the following steps: and step two, the mass of the aluminum sheet is 5 g.

4. The method for judging the end point of the concentration and crystallization of potassium aurous cyanide according to claim 1, wherein the method comprises the following steps: fourthly, the reaction time of the potassium aurous cyanide crystal solution and the aluminum sheet is 10 min.

5. The method for judging the end point of the concentration and crystallization of potassium aurous cyanide according to claim 1, wherein the method comprises the following steps: and the washing mode of the sixth step is to slowly wash from the upper part of the funnel to the lower part.

6. The method for judging the end point of the concentration and crystallization of potassium aurous cyanide according to claim 1, wherein the method comprises the following steps: and sixthly, the aqueous solution is pure water.

Background

Potassium aurous cyanide is an important electroplating chemical raw material, is a main gold-plating raw material of integrated circuit boards or artware, is mainly used for electroplating of electronic products, and is prepared by the action of potassium cyanide and aurous chloride in analytical reagent, pharmaceutical industry and the like.

The method is characterized in that a gold potassium cyanide crystal can be obtained only by concentrating and crystallizing after a gold potassium cyanide solution is prepared, whether the gold potassium cyanide solution is completely crystallized or not needs to be judged in the concentrating and crystallizing process of a general gold potassium cyanide solution, namely, the crystallization end point of the gold potassium cyanide solution is judged.

Disclosure of Invention

The invention aims to provide a method for judging the concentration and crystallization end point of potassium aurous cyanide, which aims to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme:

a method for judging the concentration and crystallization end point of potassium aurous cyanide,

the method comprises the following steps: firstly, putting a potassium aurous cyanide crystallization solution into a beaker through a liquid taking tube;

step two: then cutting a proper amount of aluminum sheet by a knife, weighing by a balance, and putting the aluminum sheet into a sample box by tweezers;

step three: placing the beaker filled with the potassium aurous cyanide crystallization solution on an alcohol lamp bracket, and heating the beaker by an alcohol lamp;

step four: then the worker puts the aluminum sheet in the sample box into a beaker containing the potassium aurous cyanide crystallization solution through tweezers and reacts for a period of time.

Step five: filtering the solution obtained after the reaction in the step four through a filter funnel;

step six: washing the filter funnel in the fifth step by using an aqueous solution;

step seven: and then observing substances on the inner side of the filter funnel through a magnifying glass, wherein if the inner side of the filter funnel has elemental Au, the gold potassium cyanide crystallization solution is not completely concentrated and crystallized, and if the inner side of the filter funnel does not have elemental Au, the gold potassium cyanide crystallization solution is completely concentrated and crystallized to reach the crystallization end point.

Preferably, the capacity of the potassium aurous cyanide crystallization solution in the first step is 50 ml.

Preferably, the mass of the aluminum sheet in the second step is 5 g.

Preferably, the reaction time of the potassium aurous cyanide crystal solution and the aluminum sheet in the step IV is 10 min.

Preferably, the washing mode of the step six is slow washing from the upper part of the funnel to the lower part of the funnel.

Preferably, the aqueous solution in the sixth step is pure water.

Compared with the prior art, the invention has the beneficial effects that:

according to the invention, whether the potassium aurous cyanide crystallization solution is completely crystallized or not can be accurately judged through the reaction of the aluminum sheet and the potassium aurous cyanide crystallization solution, namely the crystallization end point is reached, a worker does not need to estimate the crystallization time through concentration, and the worker waits when the potassium aurous cyanide crystallization solution reaches the crystallization end point in advance, so that the precision of the concentrated crystallization of the potassium aurous cyanide crystallization solution is improved, and the efficiency of the concentrated crystallization of the potassium aurous cyanide crystallization solution is improved.

Detailed Description

Example 1

A method for judging the concentration and crystallization end point of potassium aurous cyanide comprises the following steps:

the method comprises the following steps: firstly, putting a potassium aurous cyanide crystallization solution into a beaker through a liquid taking tube;

step two: then cutting a proper amount of aluminum sheet by a knife, weighing by a balance, and putting the aluminum sheet into a sample box by tweezers;

step three: placing the beaker filled with the potassium aurous cyanide crystallization solution on an alcohol lamp bracket, and heating the beaker by an alcohol lamp;

step four: then the worker puts the aluminum sheet in the sample box into a beaker containing the potassium aurous cyanide crystallization solution through tweezers and reacts for a period of time.

Step five: filtering the solution obtained after the reaction in the step four through a filter funnel;

step six: washing the filter funnel in the fifth step by using an aqueous solution;

step seven: and then observing substances on the inner side of the filter funnel through a magnifying glass, wherein if the inner side of the filter funnel has elemental Au, the gold potassium cyanide crystallization solution is not completely concentrated and crystallized, and if the inner side of the filter funnel does not have elemental Au, the gold potassium cyanide crystallization solution is completely concentrated and crystallized to reach the crystallization end point.

The capacity of the potassium aurous cyanide crystallization solution in the step one is 50 ml.

And step two, the mass of the aluminum sheet is 5 g.

Fourthly, the reaction time of the potassium aurous cyanide crystal solution and the aluminum sheet is 10 min.

And the washing mode of the sixth step is to slowly wash from the upper part of the funnel to the lower part.

And sixthly, the aqueous solution is pure water.

Example 2

A method for judging the concentration and crystallization end point of potassium aurous cyanide comprises the following steps:

the method comprises the following steps: firstly, putting a potassium aurous cyanide crystallization solution into a beaker through a liquid taking tube;

step two: then cutting a proper amount of aluminum sheet by a knife, weighing by a balance, and putting the aluminum sheet into a sample box by tweezers;

step three: placing the beaker filled with the potassium aurous cyanide crystallization solution on an alcohol lamp bracket, and heating the beaker by an alcohol lamp;

step four: then the worker puts the aluminum sheet in the sample box into a beaker containing the potassium aurous cyanide crystallization solution through tweezers and reacts for a period of time.

Step five: filtering the solution obtained after the reaction in the step four through a filter funnel;

step six: washing the filter funnel in the fifth step by using an aqueous solution;

step seven: and then observing substances on the inner side of the filter funnel through a magnifying glass, wherein if the inner side of the filter funnel has elemental Au, the gold potassium cyanide crystallization solution is not completely concentrated and crystallized, and if the inner side of the filter funnel does not have elemental Au, the gold potassium cyanide crystallization solution is completely concentrated and crystallized to reach the crystallization end point.

The capacity of the potassium aurous cyanide crystallization solution in the step one is 750 ml.

And step two, the mass of the aluminum sheet is 8 g.

And step four, the reaction time of the potassium aurous cyanide crystal solution and the aluminum sheet is 15 min.

And the washing mode of the sixth step is to slowly wash from the upper part of the funnel to the lower part.

Step six, the water solution is alcohol.

Example 3

A method for judging the concentration and crystallization end point of potassium aurous cyanide comprises the following steps:

the method comprises the following steps: firstly, putting a potassium aurous cyanide crystallization solution into a beaker through a liquid taking tube;

step two: then cutting a proper amount of aluminum sheet by a knife, weighing by a balance, and putting the aluminum sheet into a sample box by tweezers;

step three: placing the beaker filled with the potassium aurous cyanide crystallization solution on an alcohol lamp bracket, and heating the beaker by an alcohol lamp;

step four: then the worker puts the aluminum sheet in the sample box into a beaker containing the potassium aurous cyanide crystallization solution through tweezers and reacts for a period of time.

Step five: filtering the solution obtained after the reaction in the step four through a filter funnel;

step six: washing the filter funnel in the fifth step by using an aqueous solution;

step seven: and then observing substances on the inner side of the filter funnel through a magnifying glass, wherein if the inner side of the filter funnel has elemental Au, the gold potassium cyanide crystallization solution is not completely concentrated and crystallized, and if the inner side of the filter funnel does not have elemental Au, the gold potassium cyanide crystallization solution is completely concentrated and crystallized to reach the crystallization end point.

Step one, the capacity of the potassium aurous cyanide crystallization solution is 100 ml.

And step two, the mass of the aluminum sheet is 10 g.

Fourthly, the reaction time of the potassium aurous cyanide crystal solution and the aluminum sheet is 20 min.

And the washing mode of the sixth step is to slowly wash from the upper part of the funnel to the lower part.

And sixthly, the water solution is tap water.

The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts of the present invention. The foregoing is only a preferred embodiment of the present invention, and it should be noted that there are objectively infinite specific structures due to the limited character expressions, and it will be apparent to those skilled in the art that a plurality of modifications, decorations or changes may be made without departing from the principle of the present invention, and the technical features described above may be combined in a suitable manner; such modifications, variations, combinations, or adaptations of the invention using its spirit and scope, as defined by the claims, may be directed to other uses and embodiments.

The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts of the present invention. The foregoing is only a preferred embodiment of the present invention, and it should be noted that there are objectively infinite specific structures due to the limited character expressions, and it will be apparent to those skilled in the art that a plurality of modifications, decorations or changes may be made without departing from the principle of the present invention, and the technical features described above may be combined in a suitable manner; such modifications, variations, combinations, or adaptations of the invention using its spirit and scope, as defined by the claims, may be directed to other uses and embodiments.