Nanning spiral ore washing classifier

1. Spiral classifier is one of the equipment of mineral processing. Spiral classifier is a kind of equipment for mechanical classification based on the principle that the specific gravity of solid particles is different, so the speed of precipitation in liquid is different. It can filter the grinding powder in the mill, and then screw the coarse material into the feed port of the mill by using the spiral blade, and discharge the filtered fine material from the overflow pipe. Spiral classifier is called classifier for short. There are mainly four kinds of graders: high weir single screw and double screw, submerged single screw and double screw. The classifier is mainly composed of transmission device, spiral body, tank body, lifting mechanism, lower support (bearing bush) and discharge valve. Spiral classifier is widely used in concentrators and ball mills to form a closed-circuit cycle and separate ore sand, or in gravity Concentrators to classify ore sand and fine mud, and in metal beneficiation process to classify the size of pulp, as well as desliming and dewatering in ore washing operation< The spiral classifier mainly includes high weir type single screw and double screw, low weir type single screw and double screw, submerged type single screw and double screw. The low weir type is rarely used, mainly high weir type, submerged type and XL spiral classifier< The spiral classifier is widely used in ore dressing plants to form a closed-circuit cycle with ball mill to separate ore sand, or in gravity dressing plants to classify ore sand and fine mud, and in metal dressing processes to classify ore pulp particle size, as well as desliming and dewatering in ore washing operations. The machine has the characteristics of simple structure, reliable operation and convenient operation< Br > the base of the machine is made of channel steel, and the machine body is welded with steel plate. The head of screw shaft and shaft head are made of pig iron sleeve, which is wear-resistant and rable. The lifting device can be divided into electric and manual.

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3.

Hengcheng mineral processing gives you a detailed explanation of the working principle and operation theory of the spiral classifier:

1. The working principle of the spiral classifier is to feed the pulp into the U-shaped groove from the middle feed port on the side of the groove

2. The U-shaped groove makes the pulp flip back and forth, which will make the lighter particles fall at the bottom, while the heavier ones are located on the upper side, so as to separate the materials of different sizes and weights

The spiral classifier of mineral processing equipment is different from some other equipment for transporting grit, which can be divided into spiral classifier, rake classifier and floating trough classifier. The outstanding one here should belong to the spiral classifier. The main reason is that it has the characteristics of simple structure, convenient operation, large skew point of view and so on. It is easy to connect with the grinding machine for gravity flow, so it is widely used

Second, the operation theory of spiral classifier of mineral processing equipment

other classifiers are distinguished by the size and weight of solid materials, so the settling velocity in liquid is different. Fine ore particles float in water and overflow, while coarse ore particles sink at the bottom of the tank. Spiral classifier is a kind of classification equipment for mechanical classification. Because it can be connected with the mill, it can grade and filter the raw materials from the mill, and then grade the coarse and fine materials. The base of this type of machine is made of steel groove, and the body is made of steel plate by welding, so the machine is very firm. The various parts of the spiral shaft use pig iron sleeve, so it is very wear-resistant. And its performance compared with other classifiers are also greatly improved, so it is widely used in proction

4. Hello: you said that the anti sand water is actually backwater. I wonder if your concentrator has a flotation system? If there is a flotation system, the first thing to consider is whether the nature of flotation reagent will cause backwater viscosity. If it is viscous, it will affect the pulp viscosity and flow rate inside the mill (pulp will change when it reaches the highest point with the operation of the ball mill) and the discharge speed, and even lead to swelling. If the pulp inside the ball mill cannot be removed in time for a long time, the internal concentration will increase, The fineness will definitely decrease
in addition, attention should be paid to the acidity and alkalinity of backwater
generally speaking, backwater has little effect on fineness, but has some effect on other flotation indexes

6. Working principle of spiral classifier: < br > the spiral classifier is based on the principle that different solid particle sizes and specific gravity result in different settling velocity in liquid, fine ore particles float in water and overflow, and coarse ore particles sink at the bottom of the tank. It is a kind of classification equipment for mechanical classification by pushing the screw upward to discharge. It can filter the powder from the mill, and then screw the coarse material into the feed port of the mill by using the screw, and discharge the filtered fine material from the overflow pipe. The base of the machine is made of channel steel and the body is made of steel plate by welding. The head of screw shaft and shaft head are made of pig iron sleeve, which is wear-resistant and rable. The lifting device can be divided into electric and manual< Features of spiral classifier: < br > 1. It is used to separate super standard stone powder in dry process of machine-made sand. It can control the content of machine-made sand powder very conveniently and meet the requirements of users< It is suitable for large and medium-sized dry sand proction lines< The content of 0.00-0.75mm stone powder is adjustable from 2% to 15%< The quality of stone powder is easy to control, and the fineness adjustment is convenient, flexible and reliable< Br > 5. The maintenance rate of tile lining is very low< Br > 6. Frequency conversion control technology makes the operation more concise< The spiral classifier is one of the equipment for mineral processing. It is a kind of equipment for mechanical classification based on the principle that the specific gravity of solid particles is different, so the sedimentation speed in liquid is different. It can filter the grinding powder in the mill, and then screw the coarse material into the feed port of the mill by using the spiral blade, and discharge the filtered fine material from the overflow pipe. Spiral classifier is called classifier for short. There are mainly four kinds of graders: high weir single screw and double screw, submerged single screw and double screw. The classifier is mainly composed of transmission device, spiral body, tank body, lifting mechanism, lower support (bearing bush) and discharge valve. Spiral classifier is widely used in concentrators and ball mills to form a closed-circuit cycle and separate ore sand, or in gravity Concentrators to classify ore sand and fine mud, and in metal beneficiation process to classify the size of pulp, as well as desliming and dewatering in ore washing operation.

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8. Spiral classifier is based on the principle of different solid particle size, different specific gravity and different settling velocity in liquid. Fine ore particles float in water and overflow, while coarse ore particles sink at the bottom of the tank. Compared with the high frequency screen, the separation speed and conditions of the spiral classifier are slightly inferior. In the mineral processing proction line, the high frequency screen can be used to replace the high frequency screen of the spiral classifier
reference: information of Hongxing Machinery and equipment department

9. Spiral classifier is an old classification equipment. According to the foreign drawings, we first trial proce the spiral classifier. After more than ten years of efforts, we have basically formed a series. There are nearly 20 specifications of 300-3800 mm spiral diameter, which meet the needs of the domestic market. After years of improvement in proct performance, manufacturing quality and structure, certain results have been achieved< General description of spiral classifier: < br > the spiral classifier is mainly composed of transmission device, spiral body, tank body, lifting mechanism, lower support (bearing bush) and discharge valve< Br > the water tank of the machine is installed in an inclined way, and the inclination angle is determined according to the equipment configuration in the process flow. The transmission device drives the screw to rotate in the tank, and the ground slurry enters the tank from the side feed inlet, forming a slurry settlement area at the lower end of the tank, and its surface area and volume depend on the inclined angle of the water tank and the height of the overflow weir. After the pulp is stirred, the light and fine particles are suspended on it to form an overflow, which overflows from the overflow weir at the end of the water tank and flows into the next beneficiation process; The coarse and heavy particles are deposited at the bottom of the trough to form the return sand, which is transported to the ore discharge outlet by spiral< The structure of main parts of spiral classifier: < br > 1. Transmission device: the spiral classifier is composed of motor, recer, cylindrical gear pair and bevel gear< Screw (left and right): it is composed of hollow shaft, bracket, screw blade and iron lining. Hollow shaft is welded by seamless steel pipe, journal and flange. The wear-resistant life is the key in use, and the lining iron is made of wear-resistant materials< Br > 3. Lower support: because of its long-term immersion in the pulp, it is easy to wear, and frequent maintenance and replacement is its main feature. Therefore, the machine adopts the structure of movable shaft sleeve and nylon bearing bush. When the bearing sleeve and bearing bush are worn, a new set of sleeve and bearing bush can be replaced more than ten minutes after lifting the screw with the lifting mechanism, which is convenient for maintenance and replacement< Water tank: it is welded by steel plate and various section steel. The tank contains all the ore prizes, and bears the weight and all the load of the body. Therefore, the foundation construction of the tank is very important. In order to avoid the deformation of water tank caused by improper support and affect the operation of the machine, the foundation structure diagram is attached to the machine, which can be used as a reference for foundation design< Br > 5. Drain valve: in order to discharge the slurry from the water tank when necessary, a drain valve is set at the bottom of the water tank, which can discharge the slurry at any time and can be closed ring normal proction< Lifting device: it is composed of motor, worm gear recer, bevel gear pair, screw, screw and other parts. When the classifier stops working, in order to avoid the solid precipitation in the pulp pressing the screw, resulting in overload operation and the need of maintenance work, a lifting device is set. When the classifier stops, the screw must be lifted from the water tank to make most of the screw leave the pulp. In order to ensure the safety and reliability of the lifting device, a travel end switch is specially equipped to make the lifting travel self-control. When the screw is lifted, hang the screw firmly with the hook to prevent it from falling off. When the classifier stops, the lifting device can automatically lift the screw to a certain height when it is started. When the classifier is working, the lifting device can also rotate to lower the screw to the working position, so as to maintain the service life of transmission parts and prevent the hollow shaft from breaking e to overload. Whether the linkage control electrical device needs to be installed or not, the user can determine according to the specific conditions, and the manufacturer does not supply the parts required by the electrical device.

10. Spiral classifier is usually composed of the following parts: semicircular water tank; As a screw device of ore discharging mechanism; The upper and lower bearing parts supporting the spiral shaft; Screw shaft transmission device and screw shaft lifting mechanism. After fine grinding, the slurry is fed into the water tank from the feeding day. The lower end of the inclined water tank is the slurry grading settlement area. The screw rotates at a low speed and stirs the slurry, so that most of the light and fine particles are suspended above and flow to the overflow weir to overflow and become overflow. After entering the next beneficiation process, the coarse and heavy particles settle at the bottom of the tank and become ore (coarse sand), which is transported by the screw to the discharge outlet. If the classifier is closed to the mill, the coarse sand will enter the mill through the chute for regrinding< According to the number of screw shafts, spiral classifier can be divided into single screw classifier and double screw classifier; According to the height of overflow weir, it can be divided into high weir, submerged weir and low weir. The overflow weir of high weir spiral classifier is higher than the bearing center at the lower end of the spiral shaft, but lower than the upper edge of the spiral at the overflow end. The classifier has a certain settling area, which is suitable for coarse-grained distribution, and can obtain more than 100 mesh overflow size. The whole spiral of the overflow end of the submerged spiral classifier is submerged in the liquid level of the settlement area, and the settlement area has a large area and depth, which is suitable for fine-grained classification, and the overflow particle size of less than 100 mesh can be obtained. The overflow weir of the low weir spiral classifier is lower than the center of the bearing at the overflow end. Therefore, the area of settlement area is small and the overflow proction capacity is low. This kind of classifier is generally not used for classification treatment, but is used to wash the ore for desliming

wet classification is a process in which mixed particles of different sizes, shapes and specific gravity are divided into several levels according to different settling velocities in water. The difference between wet classification and screening is that screening is to divide materials into different grades according to volume (particle size), while wet classification is to divide materials into different grades according to equal falling rate, that is, each grade obtained by wet classification contains light and coarse particles and heavy and fine particles with equal settling rate in water. Screening is generally only used for classification of ore with particle size larger than 2mm, while wet classification is usually used for classification of fine ore with particle size less than 0.1mm. The equipment used for wet classification includes hydraulic classifier and mechanical classifier

hydraulic classifier is the main classification equipment of gravity beneficiation. In the hydraulic classifier, it is to supply a certain pressure of upward flow to the pulp. The direction of flow is opposite to the direction of particle settlement. The graded particle group in the water is divided into several levels e to different settlement conditions (such as the speed of upward flow and the size of settlement area). According to the classification process, the hydraulic classifier can be divided into free settlement hydraulic classifier and interference settlement hydraulic classifier. The mechanical classifier is mainly used in the closed-circuit cycle of wet grinding. Adding classification operation in grinding process can avoid over crushing of grinding procts and control the particle size of ore sent to separation operation. The classifier can separate the finished proct from the coarse sand (overflow of classifier) and return the coarse sand to the mill for regrinding. Hydrocyclone can also be used as a classifier in grinding closed-circuit circulation

in the mechanical classifier, the separation process of ore particles is basically carried out in the distance from the feed to the overflow. The coarse particles settling at the bottom of the tank are called coarse sand, and the suspended fine particles are called overflow. The coarse sand is discharged by the mechanical discharge device in the classifier. At the same time, the mechanical discharge device also accelerates the overflow discharge, and has a certain stirring effect on the pulp, so as to prevent the settlement of fine particles in the overflow and improve the classification effect. Therefore, the action of the mechanical discharge device has an impact on the classification effect and proction capacity of the classifier. The action of mechanical ore discharging device should be as far as possible so that the pulp does not proce vortices or local agitation, and each part should appear very uniform. According to the different discharge mechanism, mechanical classifier can be divided into: rake classifier, floating trough classifier and spiral classifier. Rake classifier and floating type classifier have been replaced by screw classifier because of many shortcomings

the spiral classifier has the following advantages: simple structure; It is easy to configure and operate with grinding machine; The slope of the bottom of the trough is large, so the height of the return sand is high, which is easy to connect with the grinding machine; The grading zone is relatively stable and fine overflow can be obtained. Spiral classifier can also be used for desliming and dehydration of materials.