Study On Column Flotation Of Middle-Low Grade Collophane: Strengthened Process And Short Flow Sheet

With the rich ore is decreasing dramatically, China will take advantage of low grade cellophane by wholesale. Useful minerals of fine particles, distribution of tightness, and lots detrimental impurities lead to high content of fine particles and argillization, which deteriorate the separation environment and disturb the floatation process. Traditional floatation equipments expose problems of lengthy flowage structure and high cost dealing with ores of this kind. The innovation of mineralization patterns improves the mineralization effectiveness and brings about requirement for high-efficient separation dealing with fine minerals. There is a well prospect of high-efficient cellophane separation by using column floatation technology. Studies on high-efficient column separation equipment and process are important issues for promoting cellophane preparing technology.This paper starts with researches on cellophane process mineralogical characters, then analyze the mineralogical characters of useful minerals, dissociation process features and size distribution range. It points out high silt content and similarly"W"size distribution features, and moves forward to proclaim the notable effect on cellophane separation process by factors of leading fine fractions and high silt content.With the implement of floatation-velocity experiments, experimental study proceeds on the flotation dynamical characteristics of comprehensive size fraction, which proclaims the major characteristic "nonlinearity" distribution of cellophane process floatability. Based on this, coupling mineralization pattern and floatability, high-efficient column process for cellophane separation is proposed with the characteristics of multi-flow and stair-intensification.Features of each separation area have been studied in cellophane column flotation process by researching on grade distribution. Based on the researches of column floatation dynamics model done, the cellophane column axial grade distribution model is finally deduced taking example by the channeling model, of which the model parameters have been determined in accordance with experiment data. It shows that the model result is quite identical to the actual value by calculation.This paper takes further study on cellophane floatation features of size fractions at the guidance of researching on process floatability. Through the study of floatation speed changing rules of different size fraction, it proclaims the"first fine then coarse"process character in cellophane fraction floatation. In allusion to fraction floatation, substep floatation process is pointed out based on mineralization process features of fine and coarse fractions. According to the temporal distribution in fraction flotation process, substep floatation is intensified by regulation of turbulence intensity, bubble features, froth height and other parameters. With the framework of column separation process, floatation of all fractions is more high-efficient by the establishment of intensified sub-process. High-efficient floatation equipment and process model rudiment are constructed: the column high-efficient separation process based on features of process floatability and the sub-process based on characters of fraction floatation.Column separation experiments of low grade cellophane and column separation process for different kinds of cellophane are carried out as follows:Through one-section reverse floatation, concentrate containing P₂O₅31.09%,MgO 0.79% and recovery rate of 93.27% can be achieved dealing with the high magnesium cellophane by column separation.;Comparing with corresponding floatation cell product, recovery of P₂O₅ is increased more than 4%.Through one-section reverse floatation, concentrate containing P₂O₅29.61%,MgO 0.92% and recovery rate of 85.58% can be achieved dealing with the calcium-silicon cellophane by column separation. Based on One-section process is difficult to deal with cellophane hard to separate.;Fraction substep floatation researches on this ore have been conducted by applying one roughing one refining process. Concentrate containing P₂O₅30.01%,MgO 0.61% and recovery rate of 89.10% can be obtained, which increases 0.86% P₂O₅ content and 1.44% recovery rate comparing with cell system result. And the floatation reagent cost also decreases more than 20% meanwhile.With run-of-mine of similarly grade using column separation, concentrate containing P₂O₅ 29.78% and recovery rate of 82.16% can be achieved by applying one straight one reverse process, which increases 1.62% P₂O₅ content and 2.69% recovery rate comparing with cell system result.With the utilization of column system, not only the process structure is simplified but also the floatation cost is reduced effectively, which provide a new technique channel for high-efficient separation dealing with domestic cellophane.There are 90 pictures, 71 charts and 159 reference documents.