A bottle of mineral processing agent goes through a long journey from the production line of a chemical plant to finally being used in the flotation tank of a large mine. Every step of this journey has strict rules and regulations. Today, we will trace how the "lifetime" of mineral processing agents is spent.
After the chemicals are produced in the chemical plant, they cannot be shipped immediately. Firstly, we need to pass the quality inspection.
Large mines have very strict requirements for the quality of chemicals. Before each batch of chemicals leaves the factory, the manufacturer must sample and test according to standard procedures. Is the purity sufficient? Does the impurity content exceed the standard? Does the physical property meet the requirements? Only when all indicators are qualified can it be released.
The inspection report will be sent to the mine along with the goods. After receiving the goods from the mine, it is necessary to conduct self sampling and re inspection to confirm consistency with the report provided by the manufacturer. If there are differences between batches or if a certain indicator does not meet the standard, this batch of goods may be rejected.
This strict "entry control" is to prevent problematic drugs from entering the production system. A batch of unqualified chemicals may cause fluctuations in the indicators of the entire beneficiation plant for several days, resulting in losses far greater than the value of the chemicals themselves.
Mineral processing agents often need to undergo long-distance transportation from factories to mines. Highways, railways, and sometimes waterways are also used. The risks during transportation cannot be ignored.
Some medicines are afraid of moisture. During transportation, if it rains and the packaging is damaged and water enters, the medicine may deliquesce and deteriorate. Some medicines are afraid of high temperatures. The temperature inside the closed carriage in summer is very high, and some chemicals will accelerate their decomposition, which has already compromised the mining effect. Some chemicals are corrosive and have special requirements for transportation vehicles.
When selecting suppliers for large mines, they will consider the transportation support capabilities of the other party. Are there any rainproof measures in place? Is there a temperature control plan for summer? Does the transportation vehicle comply with safety standards? These details determine whether the medicine can arrive at the mine intact.
Even more troublesome are the chemicals that belong to hazardous chemicals. Transport vehicles require specialized qualifications, routes need to be reported, and drivers need to hold certificates to work. Any problem at any stage may result in being stopped by regulatory authorities. This is also why more and more large mines are willing to switch to environmentally friendly chemicals with low toxicity and non hazardous properties, saving many troubles in transportation.
After the medicine is transported to the mine, it's not enough to just pile it up in a random warehouse. Different types of drugs have different requirements for storage conditions.
Chemicals that are afraid of moisture should be placed in a dry and ventilated place, with a moisture-proof layer on the ground. Those who are afraid of high temperatures should be stored in a cool place, and cooling measures may be necessary in summer. Agents with unstable properties should be stored first in, first out and cannot be stored for too long. Agents that may react with each other should be stored separately and not mixed together.
The chemical warehouses in large mines are often clearly divided and labeled. Each type of medication has a fixed storage location, making it easy to access and inventory. The warehouse administrator should regularly check the condition of the stored chemicals, and promptly deal with any packaging damage or deterioration of the chemicals.
Some medicines also require double person and double lock management, and registration is required for entry and exit. These are usually regulated hazardous chemicals with high management costs. This is also one of the advantages of environmentally friendly chemicals - they are not classified as hazardous chemicals and have much lower warehouse management requirements.
Many mineral processing agents are purchased in solid powder or particle form and need to be prepared into a certain concentration of aqueous solution before use.
The preparation process requires attention to detail. What water should I use? Tap water, recycled water, or softened water? What is the water temperature? How long does it take to stir? What is the order of drug dissolution? These details will affect the quality of the final medication.
The pharmaceutical preparation workshop of large mines is usually equipped with specialized dissolution tanks and mixing devices. Operators follow standard operating procedures to ensure that the concentration and properties of each batch of medication are consistent. The prepared medicinal solution is transported to various dosing points through pipelines, and the entire process is sealed to reduce volatilization and leakage.
Some medicines generate heat when dissolved and require cooling; Some drugs dissolve slowly and require long-term stirring; Some medications are prone to foaming and require the addition of defoamers. These need to be handled according to the specific characteristics of the medication.
The prepared liquid is injected into the flotation tank or leaching tank through the dosing system. The dosing system is one of the key equipment in the entire beneficiation plant.
The dosing system in large mines is usually automatically controlled. The operator sets the target addition amount in the control room, and the system will automatically adjust the valve opening to maintain a stable addition amount. The system will also display the instantaneous and cumulative addition amounts of each medication in real time, making it convenient for operators to monitor.
There are also requirements for the location of the dosing point. Some reagents need to be added at the grinding inlet, some need to be added in the first chamber of the flotation tank, and some need to be added in sections. The selection of dosing points is based on a deep understanding of the process flow.
The timing of adding medication is equally important. Some medicines need to be added in advance to allow sufficient time for them to interact with minerals; Some medicines need to be added and used as needed, and adding them in advance may actually fail. The grasp of these 'time windows' is one of the core skills of mineral processing engineers.
After the chemicals are added to the slurry, they begin to exert their effects. The collector adsorbs onto the mineral surface, the foaming agent creates bubbles, the adjusting agent changes the slurry environment, and the leaching agent dissolves gold.
This is the 'highlight moment' of the potion. But this process is not as simple as it seems. Is the distribution of chemicals in the slurry uniform? Is the action time sufficient? Has it been disturbed by other components? These factors will all affect the final outcome.
Some drugs will gradually be consumed during the process of action and need to be supplemented in segments. Some drugs may react with other drugs to produce new substances. Some reagents will be scraped away with foam and enter into concentrate products; Some will remain in the tailings and be discharged together with the tailings.
The engineer judges the effect of reagents by observing the flotation foam and sampling and testing the intermediate products. If the effect is not ideal, it needs to be adjusted in a timely manner.
After the medication took effect, it did not completely disappear. Part of it is consumed, while another part remains in the tailings and is discharged into the tailings pond along with the tailings slurry.
The residual chemicals in tailings are an important part of mining environmental protection work. Some pesticide residues may have an impact on the surrounding environment and require treatment before being discharged. Large mines usually have tailings treatment systems that reduce the activity of traditional Chinese medicine in tailings through natural degradation, chemical neutralization, bioremediation, and other methods.
When designing environmentally friendly chemicals, the issue of tailings treatment was taken into consideration. They are more easily degraded naturally, have lower residual toxicity, and have lower difficulty and cost in tailings treatment. This is also one of the reasons why environmentally friendly chemicals are favored by large mines.
Not all medications are disposable. In some processes, some chemicals can be recovered and reused from tailings.
For example, some leaching agents still exist in the solution after completing the gold leaching task. By appropriate treatment, impurities in the solution can be removed, the consumed active ingredients can be replenished, and then sent back to the leaching system for continued use. This kind of recycling not only reduces the consumption of chemicals, but also reduces wastewater discharge.
The interest of large-scale mines in the recycling of pharmaceuticals is increasing. On the one hand, because the cost of pharmaceuticals accounts for a significant proportion of the total production cost, recycling can save real money and silver; On the other hand, due to the increasing pressure on environmental protection, reducing emissions means reducing risks.
Of course, recycling is not free. We need to increase equipment investment, consume energy, and generate new waste. Whether it is cost-effective depends on the specific process conditions and types of chemicals. Some circular schemes are economically feasible, while others are not worth the cost.
Each medication has its own lifecycle. With the advancement of technology and increasing environmental requirements, old drugs will eventually be replaced by new drugs.
Traditional highly toxic drugs are being replaced by environmentally friendly drugs, which is an ongoing process. The retirement of old drugs is not simply about stopping them, but requires careful planning: new drugs need to be tested and validated, operators need to receive training, inventory of old drugs needs to be used up or properly disposed of, and the dosing system may need to be modified.
After the elimination of old potions, their 'lifetime' is truly over. From factory production to use, from use to residue, from residue to disposal, every step has left traces. And the new potions took over the baton and began their own journey.
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