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Gold is a kind of precious metal, its raw material is actually separated and enriched step by step from the crushing and grinding powder of gold ore and then separated and enriched step by mineral processing method. * it is the molten gold that is molded and processed into a variety of shapes and colors on the market. 

How does gold magically change from gold ore to gold with high purity? I believe this is also the "mysterious inside story" that many people want to know. Next, the Red Star expert will reveal the specific situation for you. 

The abundance value of gold in the earth's crust is very low, and the content of gold in ore is also relatively low. The average content of gold in the earth's crust is about 1.1 / 100 millionth (0.0011PPm), and the content in seawater is about 1 / 100 billion / 1 (0.00001PPm). Due to hundreds of millions to billions of years of crustal movement and geological changes, gold elements are rich and integrated gold deposits. In gold deposits of general industrial value, the grade of gold is 2 to 3 g / t, the rich ore is 5 to 50 g / t, and the super rich ore is 50 to 500 g / t. However, at present, rich ore is still relatively rare, especially very rich ore, most of which are gold ores with relatively common gold grade. What we have to do is how to extract high grade gold from gold ores with low gold grade. 

In order to extract gold from gold ore, it is necessary to crush and grind the ore, and then enrich the gold separated from the ore by using the high efficiency mineral processing flowsheet carefully developed by Hongxing machine. 

Gravity separation and flotation are widely used in gold ore dressing, and gravity separation plays a very important role in placer gold production, and flotation rule is widely used in rock gold mines. At present, 80% of the rock gold mines in China mostly use the flotation method for gold separation, and the mineral processing technology and equipment have also been greatly improved. 

I. crushing and grinding of gold ores. 

First of all, the gold ore will be broken, this step we mostly choose jaw crusher for rough crushing, the use of standard cone crusher for medium crushing, fine crushing is the use of short-head cone crusher and roll crusher for fine crushing. The crushing and grinding process is also different according to the production scale. The small and medium-sized gold concentrator mostly adopts two stages and one closed circuit crushing process, while the large gold concentrator adopts three stages and one closed circuit crushing process. Among them, more crushing and less grinding can reduce the particle size of grinding ore, the grinding effect is better, and the mineral processing production capacity can be improved. 

II. Re-election. 

Gravity separation is widely used in rock gold mines and is suitable for the mineral processing of gold ores. It can be used to recover coarse gold in the grinding circuit, improve the mineral processing index, increase the total recovery rate of gold, and at the same time increase the output and reduce the cost. The average total recovery rate can be increased by 2% to 3%, and the economic benefit of the enterprise is good. The main equipment used in the gravity separation process is chute, shaking table, jig, short cone cyclone and so on. According to the production experience of many customers, it is found that the combined flotation-gravity process (flotation tailings gravity separation) has a better effect on gold separation. 

III. Flotation. 

It is understood that about 80% of China's gold ores are separated by flotation, which has good separation effect and high grade. There are usually two processes: preferential flotation and mixed flotation. By adding flotation reagent to the pulp, fully stirring the pulp to mix the pulp and reagent, refine the foam, make the mineral adhere to the foam, float to the pulp surface to form mineralized foam, * the end scraper scrapes out the foam. 

* the commonly used flotation process is stage grinding and flotation process, heavy-flotation combined process, etc., the recovery rate is relatively good, and obtain better flotation index and concentrate grade, which is the main trend of the development of gold flotation process in our country. 

Of course, the flotation method, like other methods, is not *, can not be effective for all gold-bearing ores, mainly consider the nature of the ore, in the selection of technological process, need to be demonstrated and tested in many aspects. 

IV. Chemical separation-hydrometallurgy gold extraction process. 

1. Extraction of gold by mercury mixing method. 

The gold extraction process by mercury mixing is an ancient gold extraction process, which is simple and economical, and is suitable for the recovery of coarse single gold. In gold production, this gold extraction process still plays an important role. The key of mercury mixing method is how to take protective measures to eliminate mercury pollution. 

2. Cyanide extraction of gold. 

Cyanide extraction of gold is the main method of extracting gold from ore or concentrate. The cyanide gold extraction process includes several basic processes, such as cyanide leaching, washing and filtration of leaching pulp, extraction of total gold from cyanide solution or cyanide pulp and smelting of finished products. 

The conventional cyanide gold extraction process can be divided into two kinds according to the different treatment materials: one is a cyanide plant for treating flotation gold concentrate or treating mixed mercury and gravity tailings. Most of the people who use this process are large state-owned mines. The other is to treat the argillaceous oxidized ore and use the whole mud to stir cyanide to extract gold. 

Nowadays, the level of gold separation technology and equipment in China has been further improved, there are a variety of high efficiency, high recovery and high grade gold ore mineral processing technology to choose and use. The Hongxing machine has special equipment for the production line of gold ore mineral processing technology, and the Hongxing flotation production line is equipped with jaw crusher, ball mill, grading machine, stirring bucket, flotation machine, concentrator, dryer, feeder, hoist, conveyor, etc., The production line has the advantages of high efficiency, low energy, large processing capacity, good separation effect, high recovery rate, low production cost, good concentrate grade and so on. Welcome to call Hongxing machine online customer service to consult and purchase.