How to bring out silver in the tir

There are two main ways to extract silver from tin:

1.The solder slag with low silver content is oxidized at a temperature of 600 800 and the oxidant is air, so that the silver and copper are transformed into soluble states. Then the resulting roasting slag is finely ground and placed in sulfuric acid concentration 1 10%, liquid (volume, ml):

Solids (weight, g) = 4 9 1, temperature 70 94 secondary selective leaching is carried out, so that silver and copper are transferred into the leaching solution, and tin and lead remain in the slag. Finally, the obtained leaching solution is statically replaced with copper sheet under the condition of temperature 30 80 to obtain pure silver powder.

2.The silver-containing crude tin alloy was heated to 430 500 for melting, and the zinc ingots were added to the melted silver-containing crude tin alloy and stirred to dissolve, and the dissolved mixture was cooled to 390 400. Then centrifugal separation is carried out at the speed of 200 700 rpm, until there is no scum on the surface of the upper liquid layer, that is, the upper layer is tin liquid, and the lower layer is silver-zinc slag.

The obtained tin liquid is naturally cooled and solidified into a tin alloy after removing silver, and the obtained silver-zinc slag is distilled by vacuum to obtain silver and blister zinc.

The above methods are complex to operate and require the control of a variety of parameters, so it is recommended to seek professional help.

Silver is extracted from a mixture of silver and tin and the mixture can be separated by a high-temperature method.

Because the melting point of tin is low (melting point: boiling point: 2260) and the melting point of silver is high (melting point: boiling point: 2213), the temperature is controlled to melt the tin, and the silver can be removed.

Tin does not contain silver, only in exceptional cases some lines or contact parts will be silver-plated.

Silver will turn black because it is oxidized in the air, forming a layer of black silver oxide on the surface, and tin can react with silver oxide to form silver, so the blackened silver products are boiled in water with tin foil, and they will naturally return to bright white. Here's how:

Material tools: tin foil, salt, silver, water.

1. Pour 1000ml of water into the pot, put 1 tablespoon of salt after boiling, and cook for another 1 minute to completely dissolve the salt.

2. Put the tin foil down the edge of the pot, pay attention not to put it directly, otherwise the tin foil will completely float on the water surface, and the water will not be easy to boil.

3. After the water boils, put the blackened silver jewelry into the water and boil for 10 seconds.

4. When the time comes, take out the silver jewelry, the silver jewelry has recovered its original brightness, and there is no black scale even in the corners and corners.

Because there was a chemical reaction. sn+ago===sno+ag.

As silver is slowly oxidized in the air, a black layer of silver oxide forms on the surface. In the table of metal activity sequences, tin is more mobile than silver, and silver can be replaced, so it becomes brighter.

How to save silverware:

1. Surface maintenance: If the surface of the ancient silver is only gray or brown antique pulp, this is a relatively stable silver chloride antique color, which is the deposition of the style, which can enhance the artistic charm of the utensils, and should be preserved well and not treated. For the color is particularly gray, the pattern is not clear, only if you are sure that it will not damage the surface of the instrument and can make the decoration clear, you can drop a few drops of ammonia in the alcohol, and then gently rub it with a soft cloth or cotton, wipe it in moderation, do not rub it bright, and you can't clean it with silver washing water, otherwise you will lose the ancient color spots formed by the long style.

For particularly badly corroded utensils, you can use a soft brush dipped in dilute hydrochloric acid to gently scrub until the rust disappears, immediately wash with distilled water, and dry it with a soft cloth.

2. Maintenance: Do not squeeze heavy objects when storing silverware, so as to avoid collision, deformation or abrasion. For the old silverware that needs to be repaired, the broken bonding, the fracture is welded, and the deformed can be made of tin or wood and other ductile materials according to the local shape of the utensils and the utensils are lined with soft cowhide or sheep felt, and then used pliers or small hammers to restore their original appearance as much as possible.

3. The room where the silverware is kept must be kept clean, free of dust, pollution, and no hydrogen sulfide, sulfurous acid gas, etc., so as not to make the silverware dim. It is placed in a glass case when it is displayed, and it is placed in a brocade box when it is stored. It is also possible to classify the collection of ancient silverware and attach it to the flannel cloth, so that the complete set of objects will not be lost due to confusion, and it is also convenient for appreciation.

Fold the collector's watch and then put a layer of cotton cloth to avoid scratches.

Because of the chemical displacement reaction, tin reacts with silver oxide to form silver. It would be better if some salt water was added.

Because of the chemical displacement reaction, tin reacts with silver oxide to form silver.

The composition of tin foil is aluminum, not tin. The displacement reaction is right, but the tin foil composition is wrong.

Although we call it tin foil, it is actually made of aluminum.

Typically, the silver-tin alloy is heated in a hydrogen atmosphere (and then separated).

The silver tin oxide waste was placed in a resistance furnace, activated and cooled under the condition of vacuum degree, and then heated to 800 850 for 2 5h in a hydrogen atmosphere to obtain an ag-sn alloy. The method first activates the silver tin oxide waste, so that the silver tin oxide waste is easier to be reduced in the subsequent reduction step, and the silver tin oxide waste can be reduced at a lower temperature, and the silver tin oxide waste is in a solid state in the reduction process and the reduced material, so that the loss caused by the melting volatilization of the silver tin oxide material is avoided, so the first rate is high; At the same time, the possibility of contamination of the reduced Ag-Sn alloy by impurities in the material boat and furnace is avoided (at least reduced), and the purity of the obtained Ag-Sn alloy is ensured.

ps: silver tin oxide is used as an electrical contact material, in its production process, that is, silver and tin are first melted in an oxygen-free atmosphere to obtain a silver-tin alloy, and then heated in an oxygen atmosphere to obtain (using the characteristics of tin than silver liveliness) [I am a Sino-Greek alloy Xiaogao].

Solder is an important industrial raw material for connecting electronic components in soldering circuits. Looking at the name, it is easy to misunderstand, thinking that solder is the tin metal used for soldering, but in fact, the solder is made of tin-based alloys. Solder is a mixture of tin-based alloy as solder and other fluxes, generally including solder wire, solder bar and solder paste.

At the beginning, the solder was made of tin-lead alloy, which has excellent performance, but it will cause lead pollution, so it is gradually banned by countries around the world. Tin-silver alloy is a good alternative.

After tin-silver miscible to form Ag Sn intermetallic compounds dispersed in Sn, its eutectic point composition is Sn, the melting point is 221, adding Cu to the tin-silver alloy can continue to reduce the melting point 3 4. sn₃ag₃.CU (SAC305) is a classic solder product, which has excellent physical properties and high temperature stability, and its connection strength after soldering is the same or even higher than that of traditional tin-lead alloys.

Of course, silver as a kind of ***, adding to solder will obviously increase the cost, so low-silver solder is also a current research hotspot.

In general, adding silver solder can improve the mechanical strength and high temperature resistance of the solder, and it will not reduce the wettability of the solder due to the dissolution of silver on the silver-plated surface, which is a very good material. In addition to silver, elements such as copper, bismuth, zinc, etc., can also improve the performance of solder in different ways.