Practical and rapid method for determining gold content
In recent years, with the continuous mining gold mine, in order to speed up the verification gold geochemical anomaly, guiding field construction, reduced prospecting target, shorten cycle prospecting and timely evaluation of the deposit, the emergence of the Field Determination The method, wherein the visual colorimetric method is widely applied by its rapid, sensitive and simple features. To this end, our company's newly developed thiomethicone visual colorimetric kit optimizes the detection process and difficulty, enabling geologists who are exposed to rapid field gold testing for the first time to accurately and accurately detect gold in ore. For the determination of the grade, the analysis process can be easily completed according to the operation procedure of the mineral sample detection.
Instruments prepared for mineral sample testing:
1. Ore crushing equipment, 100 mesh standard sieve
2, 1% or 1/1000 electronic balance, weighing paper, glass beaker 2
3, 25ml glass colorimetric tube, test tube rack, stainless steel tweezers, 6 or 12 hole color palette
4, alcohol lamp, thiomethicone color developer, color development sponge
5, thiomethicone visual colorimetry - KMP mineral sample detection kit
6, KMP-gold (Au) standard working fluid (for the preparation of standard samples, through the colorimetric sample of the ore sample, determine the sample position)
experimental method:
1. Take a certain amount of ore, after several times of crushing, and pass through 100 mesh sieves until there is no residual ore residue. Mix the fine powder thoroughly and set aside. (Because the mineral powder is not completely mixed after sieving, it is necessary to mix the powder repeatedly or sieve it again and again.)
2. Accurately weigh 1 gram of fully mixed mineral powder, then pour into a 25ml colorimetric tube for later use. Description: (For example, the gold grade of the ore sample is about 0.2~1.0g/ton, the sample is weighed 1g, and the gold standard dilution of 0.2~1.0 is prepared. You can also choose 1 or 2 gold standard. Formulate gold standard dilutions of 0.2, 0.4, 0.6, 0.8, and 1.0. If the gold grade of the ore sample is greater than 1.0 gram to 20 gram/ton, the preparation of the gold standard dilution is also in the range of 0.2 to 1.0. Reduce the weighing of the ore sample, assuming that the ore sample is 10 g / ton, usually 1 g / ton of the ore sample, we are weighing 1 gram, now we only weigh 0.1 gram (100 mg) of the ore sample, if the mine The color development result is consistent with the color development of gold standard solution 1.0, indicating that the ore sample position is 10 g/ton.
3. Open the thiomethicone visual colorimetric method-KMP kit (24 in total, 1, 2, 3, 4 in the box, 24 times in a single sample), red: No. 1 reagent , orange: reagent No. 2, blue: reagent No. 3, white: reagent No. 4. Take 1 No. 1 agent carefully and add it to the colorimetric tube. Shake well and add 1 No. 2 agent. (Because the No. 1 and No. 2 agents are hydrochloric acid and hydrogen peroxide respectively, they are strongly corrosive, so you need to wear protective gloves. Or use other items to protect your hands. Try not to splash the solution on your eyes, face or hands when you open the lid of the tube.), add the 1 and 2 agents and shake them thoroughly.
4. Ignite the alcohol lamp, heat the mineral sample solution in the colorimetric tube to boiling, then stop heating for 10~20 seconds, then continue to heat to boiling, repeated 2~3 times. After hearing the sound of the bottom of the test tube, put it on the test tube rack and let the solution cool down. Observe whether the decomposed mineral powder has a hard powdery precipitate. If there is a powdery precipitate, it needs to be heated until it is basically no powder. Precipitation is the standard.
(If the sediment is in a fluffy state and the sinking speed is very slow, this means that the reaction and decomposition are complete). After the operation is completed, put it into the test tube rack for use.
5. After the solution in the colorimetric tube is completely cooled, add 1 No. 3 agent, mix well, then add pure water to dilute to 25ml mark, shake well and set aside.
6. Put in a coloring sponge, plug the color tube plug and shake for 15 minutes. Pour a certain amount of pure water into 2 beakers separately, take out the sponge and wash it in the first beaker (remove the impurities), then rinse it in the second beaker, and clamp the sponge on the beaker wall with the tweezers. After dispensing the water, put it in the color chart and set aside.
7. If you need to prepare the standard working fluid, you can refer to the working fluid grade and color scale preparation process.
8. Using a toilet paper to dry the mineral sponge and the standard sponge in the color palette, take a No. 4 agent, use a plastic or glass dropper to aspirate the drug, and then add 5~8 drops of the drug to the sponge for soaking. After cleaning, clean the drug with a dropper, and then dry the sponge with a toilet paper.
9. Pipette the appropriate amount of thiomethicone coloring agent with a dropper, and add 5~10 drops of the coloring agent to the mineral sample and the standard sponge respectively. (The developer must be completely soaked in the sponge, and there are some The liquid is around the foam), and after 3 to 5 minutes, it has the best color development effect. At this time, the color judgment of the standard sample and the mineral sample can be compared to judge the taste.
to sum up:
1. Because the visual colorimetry is observed with the naked eye, only the approximate grade can be judged, and the error may be ±0.2.
2. The operation of the third step is very critical, and the effect of the decomposition of the mineral powder directly affects the color development effect, so it is necessary to observe the precipitation state.
(Standard colorimetric preparation and operation process)
Introduction:
The detection method of the standard sample for the ore sample is suitable for the thiomicidone visual colorimetry. The basic range of gold content of the ore sample is determined by comparing the color of the standard to the ore sample.
1. Reagents and tools for standard product comparison:
KMP-gold (Au) standard working fluid
KMP-thiomiketone developer
KMP-standard color development sponge
100ul~1000ul micro syringe
5ml plastic centrifuge tube, centrifuge tube rack
12-hole white color palette
3ml plastic straw
Configuration method
1. For example, if the ore sample is about 0.2~1.0 g/ton, if you want to prepare a standard of 0.2~1.0, you can choose to prepare the standard with the color scale of 0.2, 0.4, 0.6, 0.8, and 1.0.
The operation flow is as follows: first place 5 5ml plastic centrifuge tubes on the centrifuge tube rack, and write 0.2~1.0 numbers on the lid of the centrifuge tube to avoid confusion.
2. Use plastic straws to take approximately 2 ml of pure water to the corresponding 5 centrifuge tubes.
3. Unscrew the gold standard working fluid cover, and use the micro-injection needle to take the gold standard solution 100ul (0.2), 200ul (0.4), 300ul (0.6), 400ul (0.8), 500ul (1.0) to the corresponding installed. There are 2ml pure water in the centrifuge tube. (You need to clean 2 times after the syringe is used up)
4. Place a sponge in each of the 5 centrifuge tubes, cover the tube with a centrifuge tube, shake for 5 minutes, and place on a centrifuge tube holder for later use.
5. After the completion of this 1~4 step, the ore sample process can be performed. Weigh 1 (or 1) of the ore sample into the glass colorimetric tube, add the No.1 and No.2 agents in turn, boil 1 to 3 times on the alcohol lamp, cool naturally, add No. 3 agent, then add pure Water to 25ml, put into a sponge and shake for 15 minutes, remove the sponge and rinse it in clean water, then put it into the colorimetric plate, wash the sponge with the No. 4 agent, use the plastic dropper to suck the No. 4 agent, and then dry the sponge with the toilet paper. .
6. Write a number of 0.2~1.0 on the colorimetric disc, and then take the 5 standard colorimetric sponges into the groove of the colorimetric plate. Then put the cleaned mineral sample coloring sponge into the groove on the next page. Use toilet paper to dry the water in the sponge, then use the coloring agent to drop 5~10 drops onto the sponge. After 3~5 minutes, compare the color development, and compare the color development effect of the mineral sample with the standard color of the sponge. The color of the close standard sponge is the gold grade of the ore sample.
Precautions:
1. The micro-sampling needle needs to be repeatedly washed after each use.
2. After the plastic centrifuge tube is used up, it needs to be cleaned 1~2 times.
3. Standard working fluid and developer should be shaken for 5~10 seconds before use.
4. Standard working fluid, color developer and sponge need to be stored at room temperature and protected from light.
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