Wet technology for recycling asbestos and mineral fibers in asbestos mineral tailings

Abstract

The invention relates to a mineral processing technology, in particular to a wet technology for recycling asbestos and mineral fibers in asbestos mineral tailings. According to the technological process, breaking, fluidization separation, water washing spraying purifying, sand stone dehydration and overflow tail water recycling, asbestos dehydration and filter cake smashing and drying are carried out. During water washing, special requirements for water quality are avoided, and a PH value does not need to be adjusted. During wet technology working, products of each working section are subjected to subsection dehydration and tail water subsection recycling. The wet technology has the advantages that produced asbestos fibers are good in quality and high in ore dressing recovery percentage, chemical agents are completely avoided, pollution is avoided during the whole production process, the problem of fiber ore pulp net pasting is solved with a special rotating spraying type vibration drum sieve, so that washing, stripping and screening of the asbestos fibers are completed together, the asbestos recovery rate and the return water using rate are improved, and accordingly the economical benefit of an enterprise is improved. The wet technology is very suitable for asbestos and fiber mineral tailings during mineral separation.

Description

(1) Technical field [0001] The invention relates to a beneficiation process, in particular to the separation, sorting and utilization of fibrous minerals and asbestos tailings, specifically a wet process for recovering asbestos and mineral fibers from asbestos mineral tailings. (2) Background technology [0002] At present, asbestos is the representative of fibrous minerals. The traditional beneficiation method at home and abroad is the dry air separation process. The ore that is about to be mined is dried, then crushed and milled to remove the cotton, and then the air is used as the medium. Asbestos and its dust, gangue, and sand particles are suctioned and screened in the state of gas-solid two-phase flow, so as to achieve the technological purpose of sorting and purifying asbestos and its fibrous minerals. The process of this method is simple, but there are following shortcomings that are difficult to improve: [0003] 1 In the gas-solid two-phase flow, whether it is the...

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Problems solved by technology

Due to the long-term mixing of fibers, dust particles and sand, after the seasonal changes of wind and sun, atmospheric precipitation and alternating freeze-thaw, on the one hand, inclusions of fibers and dust particles will be formed, and on the other hand, the three They are tightly bonded together, not as clean as the fibers in the newly mined ore. In this case, the traditional dry air separation process is unable to recover asbestos tailings, and the process effect is extremely poor.

[0005] 3 In order to meet the separation and purification of fibers in the gas-solid two-phase flow, the premise of the dry air separation process is that the selected ore or material must be dry, so whether it is in the north or the south, the mined ore or selected The materials must first be dried in the sun or mechanically. For asbestos beneficiation, it takes 20-40 tons of ore to select one ton of asbestos. With such a large beneficiation ratio, the energy consumption and cost of drying are quite high.

[0006] 4 In the dry air separation process, due to the low density of the air, in order to improve the operation intensity of the suction separation, the fan air volume is configured on the one hand; at the same time, repeated air separation must be performed to make up for the disadvantages of the low beneficiation efficiency of this process itself

[0009] 1. Whether it is ball milling or rod milling, the length of asbestos fibers will be damaged, and asbestos is graded according to its fiber length, the longer the fiber, the higher the price

[0010] 2. The method for sorting asbestos fibers and sand particles in this patent is to use a spiral classifier or hydrocyclone in the pulp flow, but because the density difference between asbestos fibers and sand particles is very small, asbestos is 2.5-2.54g / cm3, and sand particles are 2.6g / cm3 or so, especially in tailings, asbestos forms inclusions with sand and grains, and it is even more difficult to separate the two with this method

[0011] 3. There is no effective method specifically for the soft fiber pulp like asbestos that is easy to "paste the net" in the purification dust screening operation

But on the other hand, after the asbestos and dust absorb water, the "paste net" produced by the increase of the viscosity of the pulp increases a lot of difficulties for the screening.

The existing wet screening equipment for solid granular and flake minerals is not ideal for wet screening of fibrous minerals such as asbestos

[0022] Patent No. 98121630.7 is reflected in the beneficiation process and fails to provide reasonable equipment for the purpose of asbestos purification for the above situation. Practice has proved that traditional ore shakers, belt launders, fan launders, turning beds, vibrating screens, Cone cylinder screens cannot effectively solve the problem of asbestos and dust purification, and its direct appearance is "paste net"

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