Ore hold up of thickener

1. It is required to measure and control its instantaneous concentration, but it is required to measure and control its average concentration in a certain period of time, so that its underflow concentration changes within the set range. And ensure that the thickener does not press the rake, and can run stably for a long time. The particle size of flotation pulp is very fine and the negative charge on the surface is strong, which leads to the electrostatic repulsion between the particles. In this paper, the selection of tailings dewatering agent was studied, and the new process of electrical neutralization and adsorption bridging was used to treat bauxite flotation tailings. The experimental results show that the overflow plankton can be reced to less than 1G / L and the underflow concentration of tailings thickener can be greatly increased. The results showed that: W1 + P3, W3 + P3 and w15 + P3 were the best treatment schemes, and w15 + P3 was the best; The initial concentration of pulp should not be too high, and it is better to control below 12%. In water treatment, it is necessary to add electric neutralizing agent to adjust the pH value of tailings pulp to 6.7 ~ 7.7, and then add adsorption bridging agent to ensure the settlement effect. The tailing settling equipment was studied, and the tailing dewatering process with no transmission, maintenance free, deep cone and high efficiency settling tank was adopted to further settle and dehydrate the tailing slurry of soil ore forward flotation. The experimental results show that the concentration of tailings slurry can be increased to 45-50% by this process, and the overflow plankton is less than 1G / L. all the overflow water can be returned to the proction process for mineral processing and Bayer process washing without obvious harmful effect; At the same time, the labor intensity of workers is low, and the workload of overhaul and maintenance is very little. Through the instrial operation of the new process of dewatering tailings from positive flotation, the operation conditions are graally improved, the process indexes are continuously optimized, and the full utilization of tailings water is realized. The improvement measures of technology and equipment are put forward: increasing the conveying capacity of tailings pump; The configuration and adding method of flocculant were improved; Select high-precision mud layer detection and control equipment.

2. The high concentration slurry pipeline and electric actuator are added to the mixing tank, and the ray concentration meter and electromagnetic flowmeter are installed to measure the concentration and flow of the slurry. It should be noted that the ray concentration meter principle is the principle. The concentration meter can only work in a limited range, which is prone to inaccurate measurement. It is necessary to calibrate the concentration meter frequently to ensure its accuracy. Pulp adding switch is controlled by electric actuator. The other pipe is filled with clean water, and the electromagnetic flowmeter is installed on the pipe. The amount of water added is regulated by the water pump controlled by the frequency converter. Need to adjust the concentration on the computer settings. The working principle is as follows:

after setting the concentration, measure the square ore flow and drawing concentration value, calculate the water quantity to be added, and then accumulate it as the PID control setting value. The PID output controls the frequency of water adding frequency converter. This method avoids the use of instantaneous error accumulation effect, and can ensure that the system adjustment error is within the allowable range.

3. Yes, but e to the high grade (65%) and high density of iron concentrate, we have to use a special thickener for our proction

4. The function of thickener in beneficiation process includes: desliming, pulp classification and proct concentration.

5. At about two o'clock in the morning of April 11, the 32m iron concentrate concentration tank of No.3 concentrator (7 million T / a) of Yuxi mining Co., Ltd. of Kunming Iron and Steel Co., Ltd. collapsed, causing the No.3 concentrator to stop proction for more than 10 days, resulting in an indirect economic loss of 47 million yuan. Fortunately, there were no casualties. At present, the thickener is still under repair.

6. Thickener is a kind of solid-liquid separation equipment based on gravity sedimentation. It is usually made of concrete, wood or metal welded plate as structural material to build a cylindrical shallow groove with cone bottom. The slurry with solid weight of 10% - 20% can be concentrated into underflow slurry with solid content of 45% - 55% by gravity sedimentation. The thickened underflow slurry can be discharged from the underflow port at the bottom of the thickener with the help of the rake installed in the thickener and running slowly (1 / 3-1 / 5R / min).

7. 1、 Overview
in a gold smelter that uses roasting acid leaching cyanidation process to treat flotation gold concentrate, a large number of crystals are often generated in the process pipeline, agitating tank, thickener and intermediate storage tank of the acid leaching system. With the passage of time, these crystals grow up and deposit on the pipeline and tank wall, resulting in pipeline blockage and leakage A series of fault factors, such as equipment stop operation, seriously affect the normal proction. It takes a lot of manpower, material resources and time to clean up the crystal every year, especially in winter
in this paper, the author carried out independent research on this problem, starting from the analysis of the chemical composition of the crystal, studied the formation process of the crystal step by step, tried the salt crystallization theory to explain the whole process of this phenomenon, put forward the technical scheme to solve this problem, and demonstrated the advantages and disadvantages of the current method from the technical and economic point of view, The preliminary basic work has been done to thoroughly solve the problem that has been bothering gold smelting enterprises for a long time in the future< According to the relevant technical data, acid leaching crystals exist in different degrees in the process of hydrometallurgy of non-ferrous metals, which are generally believed to be mainly CaSO4 · 2H2O and MgSO4 · 7H2O, with other ore-forming materials. Under the guidance of this understanding, the chemical qualitative analysis of the crystal was carried out firstly: firstly, the crystal appearance of typical crystal was the same as that of calcium sulfate by naked eye observation; Second, the samples were dissolved in appropriate solvents and then adjusted to alkaline solutions, adding a small amount of two aldehyde two 2- [hydroxyaniline], or GBHA, to form red chelate precipitates, which is a specific identification reaction of Ca2+. The test solution was acidified with HCl, and BaCl2 solution was added to the obtained clear solution to form BaSO4 white precipitate, indicating the presence of SO2-4. The main chemical components of the crystal are calcium and magnesium sulfate, and other minerals are silica, iron oxide and so on. The results of quantitative analysis of outsourcing in a factory are as follows: wca15.6%, wmg1.03%, and the corresponding sulfates are CaSO4 · h2o68%, MgSO4 · 7h2o10.45%, sio25.3%, fe2o36.1%< 2. The formation mechanism of acid leaching crystal
the raw material of gold smelter is flotation gold concentrate, which is usually proced by adjusting lime to weak alkaline medium. In addition, the gold ore itself contains a certain amount of calcium and magnesium oxides. When the high-temperature calcine is leached with dilute acid, a large amount of calcium and magnesium will inevitably be transferred into the solution, With the decrease of solution temperature, the supersaturation of these impurity ions increases graally. In case of the nucleation of solid suspension, there is a tendency of crystallization. The content of calcium and magnesium in the calcine is 1.12% Cao and 0.21% MgO, and the content of Ca in the acid leaching solution is about 600-800 mg / L. it can be seen that the calcium and magnesium brought in by the raw materials are the main causes of crystallization. However, e to the shortage of raw materials, the smelter can not control the introction of Ca and Mg to prevent the formation of crystals. The solubility proct constant of CaSO4 is KSP = 9.1 at room temperature × 10-6

8. Thickener
and thickener are different names of the same type of equipment used in different instries, equivalent to the alias of people. The main thing is to understand his transmission mode and control requirements. Huaibei proces more thickeners,
proced by Huaibei heavy science Mining Machinery Co., Ltd.
I have used his procts, and I can trust his after-sales service and proct quality. I have a call that I can provide to you.

9. Copper ore processing equipment and uses are as follows: jaw crusher, cone crusher: crushing ore, so that useful minerals and gangue minerals achieve monomer dissociation. Self centering vibrating screen: the mixed materials are divided into different grades according to the particle size, and the procts with qualified particle size are separated to avoid over crushing of ore and improve the proctivity of crusher. Ball mill: crushing the ore to achieve finer particle size. Hydrocyclone: timely separation of qualified procts to avoid over grinding, at the same time, it can separate unqualified coarse sand and return to regrinding; There is also the function of concentration flotation machine: the pulp is aerated and stirred to make the surface of the ore particles which have been affected by the collector adhere to the bubbles and scrape out with scraper to get the concentrate. Thickener: the process of precipitating and concentrating the slurry to separate the thinner slurry from the clarified solution and the slurry. Filter: remove most of the capillary moisture in the material. In addition, there are some auxiliary equipment, such as electric vibrating feeder, belt conveyor, mixing tank, ore bin, sand pump, pump pool, motor, etc. The overall process flow of copper ore dressing: crushing system adopts three-stage closed-circuit crushing, and grinding system adopts one-stage closed-circuit grinding. The separation process is as follows: coarse concentrate is obtained by roughing and regrinding, concentrate slurry and tailings slurry are obtained by one sweep and one cleaning, tailings slurry is transported to tailings pond by dry discharge of tailings, and concentrate slurry is transported to concentrate bin for storage after concentration and filtration. The raw ore is transported to the raw ore bin for storage by the tramcar, and then sent to the jaw crusher by the electric vibrating feeder for primary crushing. The crushing procts are transported to the cone crusher by the belt conveyor for secondary crushing. The secondary crushing procts are transported to the self centering vibrating screen by the belt conveyor for screening, and the procts on the screen are transported back to the three-stage cone crusher by the belt conveyor for crushing, The screened procts are transported by belt conveyor to the circular ore bin for storage. The ore in the round ore bin is fed into the ball mill by the electric vibrating feeder for grinding. The grinding procts are sent into the hydrocyclone for classification. The underflow of the classifier returns to the ball mill for grinding. The overflow is transported to the mixing tank by the pipeline for mixing. After mixing, the pulp enters the flotation machine for flotation. After the slurry passes through the primary copper roughing, the tailings are scavenged. The scavenged concentrate is returned to the copper roughing for re concentration. The scavenged tailings slurry is pumped to the concentration cyclone for concentration. The concentration overflow is transported to the high-efficiency thickener for re concentration. The overflow water of the thickener is returned for reuse. The underflow is transported to the high-efficiency multi frequency dewatering screen with the underflow of the concentration cyclone for filtration, The filtrate water is returned to the tailings slurry, and the filter cake is transported to the tailings pond by belt conveyor. The concentrate from copper roughing goes into ball mill for regrinding. After regrinding, the concentrate slurry is transported to deep cone multi cone high-efficiency thickener for concentration. The overflow water is returned to proction for reuse. The concentrated underflow flows into plate filter press for filtration, and the filter cake is transported to concentrate bin for storage by belt conveyor. The specific copper mine will ultimately determine your technological process according to the nature and quantity of copper mine. For details, please consult Xinhai mining machinery for more specific copper flotation process.