Sepiolite purification technique

Abstract

The invention provides a sepiolite purification process, belonging to the sepiolite purification process, which mainly solves the technical problems that the existing process can not continuously produce the sepiolite with higher purity on a large scale, etc. The key point of the technical proposal is that crude ore mixed water is poured into a multi-class mixing pool and mixed with multi-class by a slow-speed mixing machine to prepare the slurry, settled with multi-class by an overflow settlement trough, and settled with multi-class by a buffer settlement pool and separated to prepare sepiolite suspension; solid and liquid separation of the sepiolite suspension is carried out by a screen filter device; dehydration by a press filter machine and the drying are carried out so as to gain the product. The sepiolite purification process is convenient for controlling the dispersion degree of the pulp and continuous producing; the yield is greatly improved; the sepiolite purification process avoids the defect that the sepiolite is difficult to be separated from the water by the normal press filter machine; furthermore, no other filter aid is added, thus avoiding pulp pollution and greatly improving the dehydration speed. As the centrifuge is not adopted, the process can greatly reduce the energy consumption and increase the output. The sepiolite purification process can be widely applied to the processing and purification of various low-grade sepiolites.

Description

technical field [0001] The invention relates to a technology for processing and purifying sepiolite, in particular to a production technology for processing and purifying low-grade sepiolite. Background technique [0002] As a rare non-metallic mineral, sepiolite is not widely distributed in nature. The main producing country is Spain, followed by the United States, France, Turkey, Russia, Australia and Africa, but it has unique physical and chemical properties and is widely used in each field. At present, the grade of raw seafoam in foreign countries such as Spain and Turkey is relatively high, and the content of sepiolite generally reaches more than 80%, which can be directly crushed or granulated to become an excellent industrial raw material. It is used in coatings, rubber, animal feed, Drilling mud and other industries are widely used. However, our country is mainly a sedimentary sepiolite mine, and the raw ore grade is low, and the raw ore content is only about 20%. ...

AI Technical Summary

Problems solved by technology

However, our country is mainly a sedimentary sepiolite mine, and the raw ore grade is low, and the raw ore content is only about 20%. Generally, it is processed into products through mechanical crushing, and the products can only be used as various feeds, fertilizer fillers or welding rod accessories. The physical and chemical properties of sepiolite have not been fully utilized; in order to increase the added value of the product and be widely used in environmental protection, rubber fillers, catalyst carriers and other fields, the raw ore must be purified

However, the purification of sedimentary sepiolite raw ore in my country mainly faces the following problems: first, because the raw ore grade is low, the impurity components are complex and unstable, and the purification process is complicated; Impurities are mixed together and it is difficult to separate; third, because sepiolite is a natural micron-scale material, it is easily dispersed in water, so dehydration is difficult

A large number of production experiments using the above-mentioned patented technology have proved that the process has huge defects: for example, the use of high-speed dispersion mechanism pulp is easy to make the pulp too thick, and the difficulty of impurity precipitation is increased; the use of centrifuge sedimentation separation and other processes are interstitial operations, Continuous production is not possible, and the output is relatively low; adding other filter aids may contaminate the pulp, and dehydration is difficult, etc., and it is difficult for them to produce high-purity sepiolite in large quantities.