Other types of spiral chutes

Production practice long time, spiral chute is considered to be effective reselection apparatus for processing a particle size of 0.03mm or more mineral hematite. Compared with other sorting equipment for processing similar materials, the spiral chute has the advantages of simple structure, stable operation, convenient operation, low energy consumption and low production cost. However, industrial spiral chutes also have the weaknesses common to most re-election equipment, that is, they cannot meet the large-scale industrial production needs of hematite in terms of single-machine processing capacity and sorting efficiency.
In order to further improve the structure of the existing spiral chute, many units have made many useful explorations in recent years. Through the analysis of the sorting process of minerals on the spiral chute, the problem of the progressive dehydration from the top to the bottom of the spiral chute was initially identified, which is one of the main reasons that affect the low efficiency of the mining area and the large amount of medium ore. . In order to solve this problem, in addition to continuously adding flushing water at the inner edge of the spiral groove, according to the reason that the bed surface of the shaker bed is added, some ribs are added on the surface of the spiral groove to stir up the eddy current and generate upward. Pulsating the water speed, increasing the power loosening of the water flow. After a rubber strip having a rectangular cross section is added to the spiral groove surface, a spiral spiral chute is formed. In addition, progress has been made in the development of tapered spiral chutes and rotary spiral chutes.
First, come to the spiral chute
Technical characteristics of A equipment Tests have shown that the number, height, angle with the spiral diameter, and the width of the inner and outer edges of the groove at the two ends of the spiral groove have a certain influence on the sorting operation effect. Through repeated trials and adjustments, the structure of the double strip is added to the Ñ„1200mm spiral chute; the arrangement of the strip on the groove surface is shown in Fig. 1.

The role and effect of B to the complex strip can be attributed to three points: (1) continuously thickening the mineral stream layer to facilitate stratification and zoning of light and heavy ore particles; (2) due to the presence of pulp The front edge of the strip forms a vortex, which produces an upward pulsating water velocity, so that the ore layer is loosened to discharge the coarse gangue of the bottom layer and enter the tailings belt; (3) the coarse-grained heavy mineral located in the middle ore belt Article inflow concentrate with that metal recoveries can be improved.
The test results for the selection of the spiral chute to select the Gongchangling lean hematite show that the addition effect of the Calais double strip is significantly higher than that of the unfilled strip.
The results of particle size and grade analysis of the product show that after the spiral groove is added to the double strip, the effect of discharging large particle gangue with a particle size of 0.074 mm or more and recovering iron mineral with a particle size of 0.037 mm or more is remarkable. The recovery of fine-grained iron minerals has not improved much, so further research and improvement are needed.
The iron ore magnetic separation tailings used for the treatment of the Shandong Laiwu Zhangjiatun Concentrator by the spiral chute have also achieved good test results. Article Calais complex be multiplexed without contrast strips spiral chute, sorting index is significantly improved, iron ore grade increased from 28.89% to 36.31%, iron content is substantially the same tailing; copper-containing concentrate spiral chute The grade increased from 0.932% to 1.413%, and the grade of copper in the spiral chute tailings decreased slightly. The Zhangjiatun Iron Ore Plant is designed to recover magnetite, natural copper and hematite using a weak magnetic, re-election, and flotation process. The re-election process uses a reciprocating spiral chute as a re-election equipment.
Xinjiang Metallurgy Research Institute successfully developed in 1978 rotating spiral chute, since 1980, has vigorously promote the use of tantalum and niobium ore dressing plant. Ф900mm rotating spiral chute integrates the characteristics of re-election equipment such as spiral concentrator , spiral chute, shaker and centrifugal concentrator. It has large processing capacity, high enrichment ratio, wide range of recycling granularity, simple structure, reliable operation and space occupation. Small, stable operation and so on. Effective separation of tantalum and niobium ore, titanium, iron, cassiterite, gold and other minerals. [next]
A Equipment technical characteristics Ф 940mm rotating spiral chute mainly consists of four parts: frame, spiral rotating body, receiving trough and driving device. The spiral rotating body includes: a triangular pulley, a feeding bucket, a water supply bucket, a vertical shaft, a spiral chute, a cutter and the like. The overall structure of the rotating spiral chute is shown in Figure 2.

The main parameters of the Ф900mm rotating spiral chute are as follows:
Dimensions (length × width × height) 1.58 × 1.41 × 2.8m
Spiral outer diameter 940mm
Number of spiral sections 3 sections Pitch 500mm
Single machine processing capacity 24~30t/h
Selected particle size -1.5mm
Motor power 0.8kW
The spiral groove rotates around the central axis to generate a certain centrifugal force field, which can enhance the gravity and centrifugal force sorting. A baffle or groove is formed on the groove surface to improve the sorting effect. The effective sorting particle size is 0.6 to 0.5 mm. No operational adjustments are required during the operation. The equipment consumes less power and consumes less water and has lower operating costs.
B Working principle The sorting and sorting process of the rotating spiral chute is: firstly, because the spiral chute rotates at a certain speed, the heavy mineral of the bottom layer is subjected to the frictional force opposite to the flow direction of the slurry, and the inertial force of the tangential motion increases, the normal The direction force is relatively small, so that the heavy mineral moves along the rib or groove to the inner edge of the spiral groove to form a concentrate belt; the light mineral is located on the surface of the spiral groove, and the friction is small, and the centrifugal force in the rotating spiral groove and Under the action of high-speed water flow, it is quickly pushed to the outside of the spiral groove and enters the tailings belt. Secondly, the rotating spiral chute also makes full use of the combined effects of centrifugal force, friction, gravity and water flow on the ore particles for sorting. In the process of sorting, in addition to the downward spiral and the circular motion, the water flow also has a lateral circulation motion, the upper water flow moves to the outer edge, the lower water flows toward the inner edge, and the water flow on the groove cross section gradually increases from the inner edge to the outer edge. increase. When the slurry moves down the spiral line and circulates in the lateral direction, the heavy and light minerals are layered according to the density, and the combined action of various forces on the spiral groove surface makes the movement speed and movement track of light and heavy minerals appear. Great differences have strengthened the sorting process, improved sorting efficiency, and improved sorting indicators.
C Beneficiation test A ilmenite was tested on a Ф940mm rotating spiral chute and compared with a Ф600mm Cast Iron spiral concentrator. The selected ilmenite has a particle size of -1 mm, of which -200 mesh has a particle size of 41.5%. The test procedure is a rough selection and a sweep.

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