SU1613207A1 - Method of processing phosphate raw material - Google Patents

Abstract

The invention relates to the mining industry and is intended for the preparation of phosphorites for industrial processing to produce extraction phosphoric acid and elemental phosphorus. The goal is to reduce the cost of processing, to improve the quality of the finished products, while at the same time obtaining the product for the production of pellets. For this, before grinding, the feedstock is averaged to contain P ₂ O ₄ depending on carbonate content from 22.5 to 24.0%. In the process of classification, the coarse material first removes a large fraction of more than 0.5 mm and returns it to regrinding. The remaining conditioned fraction is sent to the second classification, where it is divided by size 0.03-0.95 into large and small products. A large product is used to produce phosphoric acid, and a small product is used as a raw material for the production of pellets.

Description

The invention relates to the mining industry, in particular to the preparation of phosphorites for industrial processing with the production of extraction phosphoric acid and elemental phosphorus.

The purpose of the invention is to reduce the cost of processing, improving the quality of finished products with the simultaneous additional production of a product for the production of vegetables.

The essence of the method lies in the fact that selective grinding of the initial phosphate, averaged over the content from 22.5 to 24.0% of the raw material, is carried out on grinding units with a two-stage classification unit. In this case, a large (non-conforming) fraction with a particle size greater than Oj5MM is first derived from the ground material in the classification process. It is returned to the mill in the mill. The resulting conditioned fraction is directed to the second stage of classification, where the size of 0.03-0.05 is divided into two products: the first product (granular) with a predominant content of large and medium size classes is used for the production of EPA; the second product (solid) containing up to

Yu

70% of particles with a particle size of 0.5-0 mm are designated for the production of phosphate pellets.

The expediency of the method is determined not only by optimizing the granulometric composition for the corresponding methods of processing phosphate raw materials, but also by optimizing their chemical composition due to the redistribution of the main chemical components of grain size in H3Men j4eHHMX phosphates. In the small (0.05-0 mm) phosphorite classes, measured to a particle size of less than 0.5 1 hm, the concentration of aluminum and iron sesquioxides occurs, i.e. those components that contribute to the production of durable pellets; In the large and medium classes, the value of the MoOGR O and Fe ,, 0, - ratio decreases. while increasing. Indicates the technical and economic indicators of the extraction phosphoric acid production process. The practical implementation of the method for the joint production of phosphate raw materials for the extraction of extraction acid and pellets with the provision of air-conditioning levels of P20 in both products is largely determined by the lower limit of P-jOj content. in the original sfye. This is due to the fact that at its content it may not be provided with the minimum allowable content of P20u in phosphorus for the production of EPA (P2. 24, 5%), and at high values of phosphoric anhydride, more high-quality phosphorites will be required whose reserves are limited, and their increased consumption bees the raw material base for the cheapest method of processing phosphate rock from geosyncline deposits. .

 The required content in the original ore at a given output of the fine product in the range of 20–55% is determined by the formula

50

Risk of re (to t 2 .. de ftgmy required content of phosphorus raw material for the production of EPA,% (according to TU 1 13-12-83- -85), / 1 eFk 2 5%). K. - coefficient taking into account separation efficiency (for industrial air separators K –0.8);

with y | 5 20 25 zo g o j

0

K - coefficient taking into account the redistribution of products, and depending on the type of phosphate rock (K2 2.9 for siliceous type, K 2 3.9 for carbonate type, K 2 3.56 for carbonate-silicon ore),

L chalk yield, fine fraction (product DD1Y pellets), fractions of a unit.

Example, The implementation of the method was carried out with the use of the most widely grown phosphate rock ore: carbsnatko cream ;; of the pure type, with a content of cx 23.72%. Estimated content to be at least | 6 „sk 23.65%.

Claims (1)

The original ore was crushed to a nominal particle size of 25 mm and was ground in a drum mill in a closed cycle with a first-stage dentine-air-air separator, in which a large fraction (grit) separated and returned to the final grinding unit in the “Shallow fraction of the first separation stage (intermediate product ) was fed to the second-stage centrifugal air separator, where it was divided into two products: coarse - raw material for the production of EPA and fine - serie, tsl phosphate pellets. Invention Formula A method of processing phosphate raw materials, including selective grinding of raw material, classification of crushed product according to class 0.5 mm, additional grinding of fraction + 0.5 mm, classification of fraction - 0.5 mm into large and small products, using a large product for the production of phosphoric acid, characterized in that, in order to reduce the cost of processing, to improve the quality of the finished products while at the same time obtaining the product for the production of pellets, the initial raw material before the election. fine grinding is averaged to a content of 22.5 to 24.0%, depending on the carbonate, a fraction of 0.5 mm is classified according to the class of 0.03-0.05 mm, and the fine product is used as a raw material for; Proceedings of the oceans.