How do you make gold from gold ore?

1. Roasting of raw ore:

The properties and characteristics of gold ore suitable for treatment by raw ore roasting method are mainly reflected in the following aspects:

The carrier minerals of gold, such as pyrite and arsenic, are embedded in fine grain size, and are distributed in ore in the form of disseminated and stellar dispersion, while most of the gold is deposited in sulfide minerals such as fine-grained pyrite and arsenic pyrite, so it is difficult for mechanical grinding to expose and dissociate.

A small part of the gold is closely related to gangue minerals, which is poor and contiguous or surrounded by carbonate and silicate minerals;

The ore contains harmful elements such as "gold-robbing" substances, organic carbon, etc. This kind of ore is mostly sulfur-poor or less sulfide fine-grained disseminated gold ore, and contains a large number of argillaceous minerals, resulting in a low flotation rate of gold, and it is difficult to improve the concentrate grade; However, due to the presence of organic carbon and other harmful elements, the leaching rate of gold is also very low, and it is impossible to realize the use of real gold. Experimental research was carried out on ore samples from a gold mine in Guizhou.

2. Roasting of gold concentrate:

The symbiosis between gold and sulfide in most of the refractory ores is close, and the flotation method can be used to fully and effectively enrich the gold-loaded sulfides, produce gold concentrate, and obtain a high flotation rate. Due to the complex composition of flotation gold concentrate and the high content of beneficial and harmful elements, the leaching rate of gold is low due to direct cyanide leaching. Therefore, roasting and oxidation pretreatment of this type of refractory gold concentrate is one of the effective methods to improve the gold leaching rate.

3. Hot press oxidation process:

The hot pressure oxidation method is divided into acid hot pressure oxidation and alkaline hot pressure oxidation. Alkaline hot compression oxidation is suitable for gold-bearing refractory ores with high carbonate content, and acid hot compression oxidation is suitable for the treatment of sulfur-containing arsenic refractory gold concentrates, so the acid hot compression oxidation process is more widely used.

Hot pressure oxidation is to oxidize and decompose pyrite and arsenic pyrite at a certain temperature and pressure, so no matter how fine the gold particles are, they will be dissociated, making the leaching rate of gold higher. Many refractory gold concentrates can be oxidized under pressure to leach more than 96% gold. However, it is difficult for this process to eliminate the "gold robbery" effect of organic carbon, so the application of this process is limited for gold concentrates with high organic carbon.

4. Combined pretreatment process:

For typical refractory gold concentrates with complex composition, many types of interfering elements and high content, it is difficult to obtain the best results by using a single pretreatment process. For example, if the concentrate contains antimony and organic carbon, if the roasting method is used to remove carbon, due to the low volatilization temperature of antimony, antimonate and antimony alloy will be formed during the roasting process, which will form a secondary package for gold, which will seriously hinder the leaching of gold;

If biological oxidation or hot pressure oxidation is used to remove carbon, although these methods are not sensitive to antimony, they cannot destroy the structure of organic carbon and cannot eliminate its "gold robbery", so the leaching index of gold will also be greatly affected. Due to the mutual restriction and contradiction between antimony minerals and organic carbon, coupled with the influence of other interfering elements, the application of a single pretreatment process is limited.

The traditional method is re-selection and then fire smelting.

Now there is more wet leaching.

** is a precious metal that is widely used in jewelry, investment, and industry. In nature, it is usually found in the form of ores, so it must be refined. This article will explain how gold ore is refined**.

Preparation. There is some preparation that needs to be done before starting refining. First of all, the gold ore must be collected and separated very early, usually using chemical leaching or physical flotation.

Secondly, you need to prepare some chemicals and equipment required for refining**, such as nitric acid, sodium hydroxide, filters and heating furnaces.

Chemical refining. Chemical leaching is one of the most commonly used refining methods. In this method, a gold-bearing ore (e.g., pyrite) is added to a mixture containing nitric acid and sodium hydroxide.

This creates a chemical reaction that separates the gold and forms cyanide. Next, the cyanide is converted to pure gold by electroplating or zinc powder reduction.

Physical refining. Another method of refining ** is physical flotation. This method is suitable for some ores that contain tiny gold grains, such as copper ore.

In this method, the ore is fed into a liquid mixture containing oxidants and surfactants. This adsorbs the gold particles onto the surfactant and causes it to float on the surface of the liquid. Subsequently, the pure gold is extracted by washing and drying to remove the surfactant.

Heating refining. Heat refining is another refining method, but it is less commonly used than chemical and physical refining methods. The method involves heating the ore to a liquid state at high temperatures in order to separate the **.

However, this method requires the use of a large amount of energy, and it is difficult to control the temperature and time of the reaction.

Conclusion. ** is such a precious metal that its refinement must be very strict and careful. Although there are several methods for extracting, chemical leaching and physical flotation are the most commonly used methods because they are not only capable of extracting pure **, but they are also relatively inexpensive.

Summary. 1.Crushing and grinding ore:

First, the gold ore is broken into smaller particles, usually using crushers and mills. This increases the surface area of the gold ore and facilitates subsequent processing. 2.

Extraction of metals from gold ore: The use of chemical or physical methods to separate metals from gold ore. Common methods include leaching, gravity separation, and flotation.

3.Smelting: The extracted metal is smelted to remove impurities and obtain purer gold.

The traditional smelting method is to use a high-temperature furnace where the gold ore and additives are heated together to melt the gold and separate it from other metals. Modern smelting methods also include electrolysis and chemical dissolution. 4.

Refining and purification: After smelting, gold may still contain some impurities. In order to obtain purer gold, further refining and purification is required.

This includes the use of chemical methods such as electrolysis, redox reactions, and solvent extraction. 5.Casting & Molding:

Finally, the pure molten gold is cast into nuggets, bars, or other desired shapes. It is important to note that refining gold ore into gold is a complex process that requires specialized equipment and technology. This is usually done by professional metallurgical engineers and metallurgical plants.

Refining gold ore into gold usually requires a series of smelting and purification processes. Here's an overview of the basic gold ore refining process:

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1.Crushing and grinding ore: First, the gold ore is broken into smaller particles, and crushers and mills are often used to get through the car.

This increases the surface area of the gold ore and facilitates subsequent processing. 2.Extraction of metals from gold ore:

Using chemical or physical methods, the metals in gold ore are separated. Common methods include leaching, gravity separation, and flotation. 3.

Smelting: The extracted metal is smelted to remove impurities and obtain purer gold. The traditional smelting method is to use a high-temperature furnace where the gold ore and additives are heated together to melt the gold and separate it from other metals.

Modern smelting methods also include electrolysis and chemical dissolution. 4.Refining and purification:

After smelting, gold may still contain some impurities. In order to obtain purer gold, further refining and purification are required in the sail and concealment. This includes the use of chemical methods such as electrolysis, redox reactions, and solvent extraction.

5.Casting and molding: Finally, the pure molten gold is cast into nuggets, bars, or other desired shapes.

It is important to note that refining gold ore into gold is a complex process that requires specialized equipment and technology. This is usually done by professional metallurgical engineers and metallurgical plants. If you are interested in gold ore refining, it is advisable to seek professional guidance and support.

At the same time, relevant environmental and safety regulations need to be adhered to to ensure process safety and environmental protection.