Method for purifying and processing attapulgite clay mineral

Abstract

The invention relates to a purifying and processing method of attapulgite clay minerals, which belongs to the technical field of the wet separating technique of minerals. The specific steps comprise utilizing spiral classifier for primary purification, utilizing cyclone classifier for secondary purification, employing gravity separation equipment for three-stage purification, concentration, drying and disintegration, thereby preparing ultrafine powders of the purified attapulgite clay minerals with the average particle size of 0.93-2.0 micron, and particle size of the largest particle is 3.5-5.0 micron. The method employs spiral classifier to remove the partly impure minerals with bigger particles in raw ores in advance, reinforcing the dispersion effect and the difference of suspension property of the attapulgites and impure minerals by means of surfactants, increasing separation factor, utilizing gravity separation equipment to separate the impure minerals and the attapulgite clay minerals efficiently, thereby overcoming the shortcomings that the prior art is difficult to achieve industrial production and obtain qualified purification products.

Description

technical field [0001] The technical solution of the invention relates to the technical field of wet separation of minerals, in particular to the purification and processing method of attapulgite clay minerals. Background technique [0002] Attapulgite, also known as palygorskite, known as "universal clay", is a sepiolite clay mineral, widely used in oil drilling, metallurgy, chemical industry, building materials, printing and dyeing, medicine, oil decolorization, pet breeding and animal husbandry and other industries with high economic value. Although the attapulgite clay mineral is one of the superior clay mineral resources in my country, the overall grade of its deposits is low, and the reserves of high-grade ores that can directly meet large-scale industrial utilization are limited. The ore grade, structure type and impurity types of attapulgite-containing clay minerals are also very different, which makes the performance of the product unstable and difficult to meet the...

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Problems solved by technology

[0003] CN1562865 discloses a method for purifying 200-325 mesh natural attapulgite with a silicate or polyphosphate aqueous solution with a concentration of 0.5% to 3% as a purification dispersant. The disadvantage of this method is that the amount of purification dispersant used is large At the same time, it is required to keep warm, especially to propose processes such as airflow drying or freeze-vacuum drying, which are not suitable for industrial production in terms of technology and cost; CN1476931 discloses the preparation process of attapulgite purification and ultrafine powder. Classify the raw materials to a fineness of about <10 microns, then control the concentration of the pulp and perform centrifugation, which is difficult to achieve with current industrial equipment; CN200510095145.5 discloses a method for preparing high-purity attapulgite, which is aimed at It is a mineral with a specific combination of attapulgite-detrital minerals. During operation, it is not only necessary to spray an aqueous solution of sodium polyacrylate with an amount of 40%-50% of the original soil mass, but also to soak for more than 24 hours. Attapulgite has to be dispersed into the aqueous solution of sodium polyacrylate. This method not only needs to consume a large amount of sodium polyacrylate, but the production operation time is long and the cost is high. At the same time, the detrital minerals are separated by natural sedimentation, which has low production efficiency and is difficult High-quality products are produced in batches, so it is not suitable for large-scale production; CN03158243.5 discloses the attapulgite wet mineral processing process, because the method is based on compressed air stirring and natural sedimentation, the separation efficiency of impurity minerals is very low, and the product The effect of improving the purity is limited, and it is difficult to obtain qualified purified products; US6130179 and U86444601 propose to use sodium polyacrylate with a molecular weight of more than 4000 (4000-5000) as a dispersant respectively, and attapulgite and impurity minerals are fully separated under stirring conditions , use industrial sieves or industrial centrifuges to sieve, realize the water-phase sedimentation and separation of attapulgite and impurity minerals under the action of gravity, and obtain a technical solution for high-purity attapulgite. The disadvantage of this method is that it only Sodium polyacrylate is used as a dispersant, and the adaptability to attapulgite clay minerals of different origins and components is narrow. Second, in most attapulgite clay minerals, the particle size distribution range of impurity minerals is very wide. There are both coarse-grained and fine-grained grades, so the industrial application of the screening process is very difficult

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