Videos Gold Refining With Aqua Regia By Machine


Gold refining with aqua regia by machine, after the raw material is impure gold is melted in an induction furnace the form of grains or flakes to be fed to the Aqua region reactor. The Aqua region refining plant comprises of steps mix acid that is aqua reaction as the first step we're an impure alloy is dissolved.

Steam or heating issues as a step to enhance reaction and ensure good efficiency. this aqua region reactor is connected to a fume scrubber which takes care of neutralizing toxic fumes of acid mainly knocks generated due to nitric acid and also hydrochloric acid vapors.

Silver gets converted to white silver chloride crystals which are filtered in the silver chloride filter and once it is ensured that entire silver chloride is filtered.

Then the silver chloride crystals from the filter are collected and accumulated, these are then cemented in silver semen tation unit where it is reduced by a mixture of sodium hydroxide and glucose. The cemented silver is filtered casted into a node bar and is refined to pure silver of 999 quality an electrolytic silver refining setup.

The liquids after filtration of silver from electrolytic refining plant are also collected in liquid storage tanks. Clear gold chloride solution is transferred to another reactor where sodium metabisulfite is charged in as a reducing agent,  then this will precipitate gold from the solution, this is monitored by good pH control and viewing glass reactor for the right change in color.

The cemented gold is then filtered in the gold filter until it is ensured that entire gold is collected this wet gold is 99.5 quality and the liquids left out are transferred to exhaust liquid storage tanks.

Pure gold of 99.5 quality filtered from aqua region refining plant if it needs to be further purified should pass through the process of electrolytic gold refining in order to get 999.9 purity.

All the exhaust liquids are collected in storage tanks are passed through three tanks by overflow systems and then primarily in the first stage copper is cemented which is filtered and collected for further refining. The liquids after copper sementation are treated with alkali solution mixture of calcium and sodium hydroxide. These metallic hydroxy Tsar sedimented which are filtered in a filter press and then after clear water is discharged to drain.

The pure gold sand of 99.5 generated from the Aqua region process is first dried in an oven or it can be pure gold of 99.9 from electrolytic process. This gold is then melted in an induction furnace where after it follows the process depending on the configuration of gold bar desired, for gold bars up to 100 GMS configuration the molten gold is collected in a pre-designed mold for the desired configuration and strips, these gold strips are then passed through the rolling mill where the rollers are set to get the right thickness of the strip's getting converted two sheets.

These sheets are then passed through the cutting press with set of punching so that gold blocks are cut as desired these gold blocks are then annealed to remove oxide by a flame and then cooled and cleaned.

For gold bars above 100 GMS up to killobar configuration. The molten gold is collected in a pre-designed mold for the desired configuration. This is then cooled in the cooling table where bar is formed. A burner flame is used in order that oxides are not formed this is mainly a kneeling step and then the gold bar is cleaned.

Videos Gold Refining With Aqua Regia By Machine

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Video Process Basics How Gold Is Made In The Mining


Gold is the softest and most malleable, metal it can be pressed extremely thin crafted into various shapes even drawn out to form a fine wire. Gold isn't affected by water or oxygen as many metals are so it doesn't rust. Most gold comes from low deposits also called bein deposits concentrations of gold and other metals in the cracks of rocks. Low deposits require hard rock mining, the process of removing gold-bearing rock called or by drilling and blasting

Miners to send more than half kilometer underground there they drill holes for explosives using what's called a long whole air drill. They drill in a specific pattern set out in a plan prepared by the mines engineers. The engineers know exactly where those veins of gold are thanks to the mining companies geologists who studied or samples.

The company collects these samples by drilling deep into the rock at 50-meter intervals. These diamond drill cores as they're called are up to 100 meters long and measure three point five centimeters in diameter.

Gold in its natural state isn't cure it's usually intertwined with silver and other metals, so the mind or has to be processed afterward to isolate and extract the gold. A metric ton of ore yields only about six point five grams of gold. After blasting the rock apart with explosives or miners use what's called a mock machine to transfer the or two cars headed to the main shaft and then above ground to the mill. There a crusher reduces the large chunks into smaller rocks about the size of gravel a mil then processed into a pulp

The factory adds a water and cyanide solution than another mill and flows into large settling tanks. The wet solids being heavier sinks to the bottom, the water the top drains to another area. They transfer the solids to an agitation tank and blowing air the oxygen steps off a chemical reaction between the cyanide and the goal triggering the gold to dissolve and leach into the surrounding water.  

Drum filters then separate the water from the solids. This water now joins the water that was separated earlier they pour in zinc powder to solidify the dissolve gold and four pieces containing both zink and gold. To smelt it into bars they first have to mix several chemicals, manganese dioxide, flew right, silica flower, borax and sodium nitrate. 

This chemical mix called flux will separate the gold from the impurities. Into the smelter whose temperature is a fiery 1,600 degrees Celsius. The rotate smelters so that the contents heat evenly, over two and a half hours the heavier gold eventually sinks to the bottom while the impurities called slag float to the surface.  They pour out the slag taking a sample to make sure it contains gold or no.

The gold cooled slightly so they reheat - 1600 degrees celsius, then cast into bar-shaped molds. The gold takes about four minutes to harden, and then another hour to cool completely in a basin of cold water. Then bullion cleaned of dirt remaining combustion. Gold bars or ingots, this stage the gold is eighty percent pure.

Video Process Basics How Gold Is Made In The Mining 

Precious Metals Analysis For Sampling


A true sample is a small sample of a mask which represents the average composition of the mass or simply stated truly representative of the bulk, uniformity of composition and particle size of the boat material are the key features which lead to selecting the processes required to generate true samples.

Both lots of materials for saddling come in many forms from mick solids like crushed or for scraps circuit boards for recycling to sludge slurries and solutions from industrial processes.

To maximize uniformity of composition fault materials are most often process prior to sampling.

For example scrap metal lots are melted to form alloys for leech to take all the metals into solution for analysis. When the ball contains solid particles imaginas ation for mechanical mixing is a sampling technique employee to create a uniform distribution of particles so that each sample taken from the mixed will represent the average composition.

The uniformity of composition of the starting material greatly affects the amount of reduction needed for true sample

Highly uniform materials require less reduction. fundamental principle of good sampling is to gradually reduce the bulk simultaneously with a gradual reduction in the size of the particles.

Larger sample sizes are required with larger particle size distributions of the bulk. Therefore it is of great value to crush and grind the sample to allow for taking smaller reliable sample. The sample is then mixed thoroughly to obtain a mixture that is homogenized.

For example when salt is completely dissolved into a solution, the solution is thoroughly mixed so that any droplet will contain the same concentration of dissolved salt. in order to get the same amount of thorough mixing with solid particle mixtures, the solid particles must be ground small enough and extensively mixed prior to sampling.

Each type of material for sampling and analysis has optimum ratios for the finest relative to the size of the sample. These ratios must be determined experimentally. middle of the blended and split test samples are taken from lots and sent for analysis.

Essay samples are then taken from the test samples which typically require further grinding and splitting. there are a number of traps that can produce misleading results that karen handling should avoid.

cross-contamination for one sample to the next could occur if sampling equipment is not cleaned adequately between life. care must be taken to collect all of exhaustion crushing grinding or handling fine materials that some does have different metal concentrations than the bone.

Fine particles may also pick up or lose moisture while passing through sampling equipment although they may not appear wet they may contain enough moisture to affect results so this should be accountable.

When samples reach the essay lab they may have segregated so the test sample should also be blended again and split properly.

The ipmi recognizes the importance of this technology to the precious metals community and has published and made available several books on this subject. The sampling and analysis committee of the ipmi also publishes guidelines in this field

Video Precious Metals Analysis For Sampling

The Basics Sampling Science for Precious Metals Analysis

The process of taking small samples for analysis
The process of taking small samples for analysis to determine the precious metal content of a large quantity of material is the most critical. Small errors and sapling can there fore lead to large differences in the calculated value of each precious metal. Sampling science and techniques are used on primary sources of precious metals from ore samples at mine sites.

Due to the high value of precious metals very low concentrations are contained enviable primary or secondary sources. For example a platinum concentration as low as 2 to 3 grams per ton of ore or scrap material is often profitable to recover and refine.

The process of taking samples from drilling to analysis
Secondary sources of precious metals which are manufacturing scrap or end-of-life materials for recycling and  refining must also be sampled properly for accurate results.

The fundamental processes include preparation, homogenization, equation handling and splitting from bulk lots to prepare a small sample to represent the average composition of the large amount of material.

Homogenizing is the process by which the material is blended uniformly to facilitate accurate sampling. Splitting is the act of evenly dividing materials while avoiding any separation or segregation for example a typical sample size of 300 grams may be selected to represent the average composition of several tons of material once the 300 grand sample is sent to the analytical lab the sample will then be further split to obtain smaller samples used for analysis.

Homogenizing process

The science and techniques used at mine sites for obtaining or samples utilize complex statistical analysis. The same material from initial surface exploration is first panel sighs to determine locations for drilling core samples to map out or deposits and determine mind valuations.

Chip samples are also taken within an active mind. Evaluation or deposits are used to determine where to drill and to calculate the value of the ore which is required to secure financing for the mining operation.

Materials that contain precious metals for recycling and refining are collected in bulk lots it is critical to accurately determine what concentrations of each precious metal are contained in each lot for two reasons.

First is to obtain the technical information needed to determine which processes to use for refining or whether it is even worth the cost of refining.

The second is the financial consideration to place the correct value on each lot as the materials change hands from suppliers to fires. Samples are often analyzed by both parties and transactions with a third sample saved as a referee sample for possible analysis by an independent lab.

Video The Basics Sampling Science for Precious Metals Analysis

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Precious Metals Analysis For Sampling

Artisanal Gold Mining In West Africa


Province Loba 50 meters underground Since 2001, artisanal gold mining communities have sprung up around West Africa, In many respect it resembles the gold rush of the nineteenth century.

These cities were mere fields before they came artisanal miners. His arrival created wealth and a flourishing secondary economy that drove the development of regulations, systems of land tenure, infrastructure and economic diversification.

It is fascinating to see that almost the same phenomena that occurred in the gold rush are happening again today.

Although artisanal gold mining has been active since antiquity, the sector in West Africa has grown dramatically since 2001, driven by rising gold price and the lack of alternative opportunities.

Many farmers and herdsmen have entered the sector of artisanal gold mining and now they use their profits to improve their farming activities.

In artisanal gold mining, see a direct transfer of wealth which it is unique to other products sold on the international market.

For most agricultural products, for example, those who buy in the grocery store, only a small fraction of that profit back to the small original producer, often less than 20%.

Even for social brand products, the percentage is only moderately higher. For example, the banana cooperatives receive about a dollar for 18 kilos of bananas, less than 20%. On the other hand, artisanal miners earn a minimum of 70% to 80% of the international price.

This is unheard of in other goods. Artisanal gold mining is a massive wealth from rich to poor, but also has an amplification effect.

The local secondary economy is typically five or six times larger than the primary economy, the value of gold.

Miners use their profits to pay for hardware products, mining supplies, food, clothing, transportation, communications, medicine, all things that sell local businesses and people of that service sector, in turn do the same.

Thus they are circulating gold profits, building a large and diverse local economy. Motorcycle dealers, home improvement, telecommunications, health services, infrastructure and schools often appear in cities in connection artisanal gold mines.

Mercury is one of the great problems of artisanal gold mining. Mercury is cheap and therefore affordable means for processing the gold, but it is also a deadly neurotoxin that can cause permanent damage to the nervous system, and even death.

It is also a poor extraction method, which normally gets about 40% of the gold that is in the mineral, therefore wasting resource.

Artisanal Gold Mining In West Africa

Although problems like mercury poisoning, exposure to silica dust, child labor and other criminal activity may be present in artisanal mining sites around West Africa, governments often overlook the positive benefits.

Governments and the media have a history of condemnation and demonization of artisanal gold mining without really properly understand the sector without offering solutions.

However, artisanal gold mining is now universally recognized by international agencies like the UN as a development opportunity and a huge source of rural employment and wealth generation.

The modern sector of artisanal gold mining has been strong for some 40 years and because of the jobs it provides poor rural areas, it is clear that it will continue.

In fact, it is probably stronger than the industrial sector of gold mining, which it is much more susceptible to fluctuations in gold prices.

In this context, the government and industry should help artisanal gold mining to improve their environmental and social performance to allow maximize its role of reducing poverty.

Need help and support to enter the formal economy, where you can become a responsible sector and help finance a diverse and sustainable rural economy.

And this is where comes the Artisanal Gold Council (AGC). The Artisanal Gold Council is a non-profit organization dedicated to improving opportunities, the environment and health of the millions of people involved in artisanal mining and small-scale gold in the developing world, and in doing so, we are helping to improve the integrity of the entire gold sector, from small to large.

Artisanal Gold Council (AGC)
In West Africa

Video  Artisanal Gold Mining In West Africa
Problems Solutions and Opportunities

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