Determination of ore drawing concentration of slag concentrator

1. It is easy to understand the influence of pulp concentration on the filter speed in theory, especially in the feeding stage, when the pulp concentration is high, the content of solid particles is high. Compared with the lower pulp concentration, the formation speed of filter cake is faster. When the pulp concentration is low, the fine particles are easy to directly enter the filter cloth hole, pass through, block or cover it, With the increase of slurry concentration, more particles will approach or reach the pores of the filter media. Due to mutual interference, most particles can not enter the pores and form arch bridges on them, so that the pores can not be seriously blocked for a long time, The average particle size of the filter cake formed on the surface of the filter medium graally increases from the outside to the inside along the feed direction, and the resistance of the vacuum filter graally decreases, which affects the dehydration of the inner side of the filter cake (near the filter cloth side). This effect graally increases with the decrease of the feed concentration. Therefore, the lower the feed concentration is, the higher the moisture content of the filter cake is, It can be seen that the influence of slurry concentration on the moisture content of filter cake is also very obvious. The hydrodynamics theory also shows that the filtration resistance increases with the increase of the amount of suspended solids intercepted in the filter layer. Even when the total amount of suspended solids intercepted is the same, the increase of filtration resistance of surface interception and deep interception is also different; If the suspended solids can reach the depth of the filter layer and be intercepted, the filtration resistance will increase slowly. Therefore, in the case of low feed concentration, the head loss is larger than that of high pulp concentration, resulting in a waste of power. In the initial stage of the filter pressing process, the filtrate takes the largest amount of solids. Once the filter cake is formed, the probability of fine particles passing through the filter medium is reced, Thus, the solid concentration of filtrate is reced and the clarity of filtrate is improved; In addition, the structure of cake layer was improved

2. 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.

3. 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.

4. Take copper mine as an example: the pulp concentration is determined by the overflow concentration of spiral classifier. In the process of copper ore dressing, the concentration of ore slurry is too high, which will seriously affect the quality of concentrate. If the pulp concentration is too low, that is, the separation concentration is too low, the flow rate will increase and the separation time will be shortened, so that some fine magnetic particles that should have been selected will fall into the tail. In general, in the process of copper ore dressing, the maximum concentration of feed pulp should not exceed 35%, generally controlled at about 30%, which should be determined according to the actual situation.

5. Taking iron tailings as an example, it is generally required that the concentration of raw ore slurry should be 15% - 20%. After concentration by hydrocyclone or thickener, the concentration of raw ore slurry into dewatering screen should reach 40% - 60%, and the dry discharge effect is better
if the tailings are directly fed into the dewatering screen without concentration, the excessive amount of tailings will be washed into the underflow of the screen, and the dry drainage effect is not good.

6. Thickener run muddy reasons. 1, thickener is too small, this is in the equipment selection has done, you can consider adding thickener. 2, ore to be uniform, to the pulp fluctuations can not be too large. 3. The pulp should be degassed before entering the thickener. 4. Properly rece the ore drawing concentration of thickener underflow, so that the thickener's precipitate can be discharged in time. 5. The thickener should choose the appropriate flocculant, the sulfide ore should choose the anionic flocculant, and the oxide ore should choose the cationic flocculant. 6. Add flocculant in the pump box, flocculant to be fully dissolved and then added to the pump outlet. 7. If the flocculant in the thickener overflow has an impact on the process, if no suitable flocculant is found, the thickener can only be increased, and there is no other way. The above is my personal point of view, the landlord should explain the specific, pulp concentration, thickener area. Whether the mineral composition is treated with flocculant or not only indicates who knows what the situation is. See more answers & gt& gt;

7.

There are certain connections as follows:

1. if there is a thickener or no thickener, the filtering effect will not be mentioned

2. the pulp concentration and particle size at different depths of the thickener are different (you can find the thickener manufacturer to confirm):

   1) the sediment at the bottom of the thickener is some sediment with larger particle size, and its concentration will also be higher than that above the thickener. When this part of the pulp is discharged into the ceramic filter, the filter cake of the ceramic filter will be thicker and the output will be more

   2) with the graal consumption of pulp under the thickener, the pulp with finer particle size and smaller concentration above the thickener will continue to be discharged into the ceramic filter, and the filter cake of the ceramic filter will be thinner and the output will be less{ RRRRR}

3. other questions about ceramic filter are welcome to chat with me or see my picture

8. 1、 Pulp concentration
pulp concentration refers to the content of solid particles in pulp. There are usually two ways to express them: (1) liquid solid ratio - the ratio of the weight (or volume) of liquid to solid in pulp, sometimes called dilution degree 2) Percentage of solid content (%) - the percentage of solid weight (or volume) in pulp. Common flotation concentration in flotation plant is listed in table 5-1-2
pulp concentration is an important technological factor in the flotation process, which affects the following technical and economic indicators:
(1) recovery in the flotation of various minerals, there is an obvious regularity between pulp concentration and recovery. When the pulp is very thin, the recovery rate is low, and the pulp concentration increases graally, the recovery rate also increases graally, and reaches the maximum value. When the pulp concentration exceeds the optimum, the recovery rate decreases again. This is because too thick or too thin pulp will make the flotation machine aeration conditions worse
(2) the general rule of concentrate quality is that when the concentrate is floated in a thinner slurry, the concentrate quality is higher, while when the concentrate is floated in a thicker slurry, the concentrate quality decreases
(3) when the dosage of reagent is used in flotation, a certain concentration of reagent must be kept in the pulp in order to obtain a good flotation index. Therefore, when the slurry is thick, the concentration of liquid phase Chinese medicine agent increases, and the dosage per ton of ore can be reced. On the contrary, when the slurry is thin, the dosage per ton of ore needs to be increased
(4) with the increase of pulp concentration, the proction capacity of flotation machine can be improved
(5) when the pulp is relatively thick, the flotation time will be prolonged, which is concive to improving the recovery rate or increasing the proctivity of the flotation machine
(6) the thicker the slurry, the less water and electricity consumption per ton of ore
in practical proction, besides the above factors, the most suitable pulp concentration for flotation should also consider the ore properties and specific flotation conditions. The general principles are as follows: for flotation of minerals with large density and coarse particle size, relatively thick pulp is often used; On the contrary, when the flotation density is small, the particle size is fine and the slime is fine, the thinner pulp is used; The roughing operation adopts thicker slurry, which can ensure high recovery rate and save reagents. The cleaning operation uses thinner concentration, which is concive to improving the quality of concentrate. The concentration of scavenging operation is affected by roughing operation, and is generally not controlled separately< Second, pulp blending
the flotation process can be carried out normally and effectively only after the pulp is properly adjusted before it enters the flotation process. In addition to the conventional mixing scheme, there are grading and aeration mixing schemes
1. Grading and sizing
different sizing conditions are required according to different particle size. The pulp is divided into two or three branches according to the size. The size limit of classification can be determined by experiments.

9. 1. Check whether there are sundries on the raceway and rack, whether the rake, lubrication and transmission parts are in good condition, and remove the sundries on and around the thickener

2. Check whether the overflow outlet and ore forming tank are blocked, and whether the underflow gate is opened and closed naturally

3. Check the tightness of the V-belt and whether the screw of the glue pump is loose< 4. Check whether the roller is normal. Only after the above four points are confirmed, can the machine be started.

10. The process includes: two-stage closed-circuit crushing, two-stage grinding, diverter overflow procts - 200 mesh, accounting for 95%, and then into the thickener, the pulp concentration from 18-20% to 42-45%, and then through the buffer tank into the leaching adsorption tank