DD215998A1 - WET MECHANICAL TREATMENT PROCESS FOR THE KAOLINITE ENRICHMENT FOR THE USE OF TONER FROM NON-BUXIC RAW MATERIALS - Google Patents

Abstract

The process relates to the wet mechanical treatment of non-Bauxite raw materials, which have a high quartz content and a low recyclable content. With this method, the condition for the production of a suitable precursor material for the extraction of alumina from such non-Bauxite raw materials is to be created. It is based on the fact that the non-bauxite raw material in its original grain size and mineral composition is dispersed in a digestion apparatus and then classified, thickened, defrosted and processed to form bodies on solid or agitated fine grain sieves.

Description

Title of the Invention Wet mechanical treatment process for kaolinite rich

tion for the production of alumina from nichtbauxitischen raw materials _N

'. , , '. · ·

Field of application of the invention

The invention relates to a wet mechanical treatment process for Kaolinitanreicherung for the alumina extraction from non-Bauxitischen raw materials, such as Rohkaoline, which have a high proportion of coarse quartz particles. The dressing product is a suitable precursor material for wet mechanical clay recovery.

, Characteristic of the known technical solution ßs is currently no suitable wet treatment process for the economic enrichment of a suitable lead material for the extraction of clay from Rohkaolin available "An alternative to the preparation of such raw materials with regard to the recovery of a lead material for the Aldedeproduction is in the dry processing technology · Such Known method provides to gently and selectively claim the moist, sticky-greasy feedstock by certain crushing and drying technology and Klassiertechnische conditions, so that in the nachfogenden classifying (screening or Siebenklassierung) ensures an enrichment of kaolinitstoffwertstoffkomponenten to given AlpO ^ - contents »This preparation process is the suitable precursor for the fine-grain mineral-acid digestion process.

driving the alumina extraction · For technological and energetic reasons, however, the dry treatment process as a precursor for the coarse grain-processing mineral acid digestion for alumina extraction separates. The coarse grain processing mineral acid alumina extraction has the significant advantage * that can be on the technological and technical equipment et echnical extremely complex solid / liquid separation of the pulping be omitted. In addition, this technology provides significantly lower quartz-rich effluents due to increased kaolinite enrichment. For such technologies, the wet mechanical treatment process provides the more favorable preliminary material from a technical-economic point of view »

Object of the invention

The aim is to produce a suitable feedstock for the mineral acid coarse-grain processing extraction of clay from clay mineral-containing non-Bauxite raw materials with a high quartz content at lower equipment and process complexity.

Explanation of the essence of the invention

Tonmineralhaltige, non-Bauxitische raw materials with low AIgOo content and high quartz shares could not be used for the coarse grain-processing mineral-sour clay extraction, as there was no economically working treatment process was available * The invention is therefore based on the object to develop a wet-mechanical treatment process, with the Obtaining a suitable feedstock for the coarse-grained mineral acid alumina extraction is made possible.

According to the invention this object is achieved in that the piece size <r "500 mm, preferably <r 200 mm, pre-shredded non-bauxite raw material with a quartz content of 40 to 85 % t preferably 60 - 80 % _t and a minimum content of Al2O0 of > 10 % , preferably - 15% in his

primary particle size and mineral composition in a digestion apparatus operating under mildly dispersing conditions, such as in a washing drum, dispersed with water and from the suspension obtained by the dispersion in a single classification stage in the non-; Bauxitic raw material contained grain fraction ^ 1.0 mm, preferably between 0.8 nanometers. »0.4 mm, is separated. The kaolinitische suspension containing the grain fraction - 1.0 mm is then thickened, dehydrated and on taking advantage of the plastic properties further to moldings; Processed · The classification is carried out on fixed or moving fine grain sieves, such as _e B · curved screen or ram vibrating screens. The invention will be explained in more detail below by means of an example and a method of operation.

embodiment

The technology for wet separation of a wet, plastic kaolin crude (task grain size of <200 mm, feed moisture 20 _oe. 22%, Algoo content in the task ^ 15%) ''. shows the following technological process scheme.

After homogenization (1) of Rohkaolin this is given up with simultaneous water supply to a washing drum (2). In this case, the raw casein is transferred into a suspension. The classification (3) follows directly at the discharge of the washing drum. In this process step, it is important to separate the coarse quartz and thus at the same time to enrich the AlgOo content in the desired product. The classification is carried out on curved screens with a gap width of 1.0 mm and a radius of 500 mm. The bow sieves are given a suspension with a cloud density of about 1.21 g / cnr. The overflow of a curved sieve is made by quartz-rich outlets characterized as followsj

Cloud density: about 1.7 g / cnr. '·.'.

Passage at 125 / in: - 10%

Passage at 2 mms - 95 % ι

Al ₂ O ₃ -containing: ^ 8%

Mass output j. 10-15 %

These outlets are washed in clarification ponds ο Dei ¹ Underflow of the curved screens is the valuable product of the process.

Cloudy ca, 1.16 g / cnr

Passage at 1m:> 95 %

Al ₂ O ₃ -GeJbLaIt: - 26 %

Mass spreading: 85 - 90 %

Value st off: ^ 90%

The separation grain size is approximately between 500 and 700 / um.

As a result of the classification, the underflow of the curved sieve (filler) is thickened to a cloud density of approx. 1.27 g / cm to obtain a high filter performance (4). The mechanical drainage (5) is effected by pressure filtration. The residual moisture content of the discharged Filter cake is to be chosen so that a plastic shaping (6) z. B. Tonraspier, Siebkneter or vacuum extruder is possible ο The thickened during the thickening (4) and the pressure drainage process Pro * seiltratwasser, is called circulation water The advantage of this process is that a suitable precursor material for the mineral-acid coarse-grain processing alumina extraction can be provided in a simple manner and with little effort from clay mineral-containing non-bauxite raw materials with high quartz contents inventive method gain previously unused and AlgOo-poor kaolin deposits wi important for the extraction of alumina ·

Claims (3)

invention claim 1 A wet mechanical treatment process for kaolinite enrichment from non-bauxite raw materials with lower valuable and high quartz antail, preferably for mineral acid coarse grain processing alumina extraction, in which the non-bauxite raw material is washed and classified, characterized in that the non-bauxite raw material pre-shredded to piece sizes < 500 mm with a quartz content of 40 to 85 % and a minimum content of> 10 % A ^ O ^ in its initial particle size and mineral composition dispersed in a digestion apparatus with water and from the dispersion obtained by the dispersion in a single classification stage. in the non-bauxite raw material contained grain fraction £ 1 »0 mm is separated · 2 · wet mechanical treatment process according to item 1, characterized in that solid or moving fine-grain sieves are used for the classification · 3 · Wet-mechanical treatment procedures according to item 1, -, characterized in that the suspension containing the grain fraction % 1.0 mm is thickened after the classification and dehydrated to best moisture content, which results in the production of transportable and charable moldings allows * For this 1 sheet drawing