SU1310377A1 - Method for producing long-acting fertilizer - Google Patents

Abstract

This invention relates to a technology for producing long-acting phosphate fertilizers and provides the possibility of processing low-grade iron-containing ores and increasing the yield of PjOy in fertilizer. According to the proposed method, including crushing of phosphate raw materials, treatment with sulfuric acid, flotation, granulation and drying of the product, the crushed phosphate raw materials are subjected to additional washing, followed by mixing, the resulting waste with flotation waste, by concentrating the resulting mixture and processing the resulting mass with respect to. 0,7-2 sulfuric acid at a temperature of 15 - with a pH of 0.5-0.7 and the resulting solution is fed to the processing of the washed phosphate raw materials. The proposed method allows to increase the yield of PgOj to the gota product up to 87-90% - during the processing of iron-containing ores. 1 tab. (O (L 00

Description

f5

20

25

This invention relates to a technology for the production of long-acting phosphate fertilizers.

The aim of the invention is to enable the processing of low-grade iron ores and increase the yield. in fertilizer.

Example I. 100 kg of ore with a content of 12%. and 9.9% were crushed and washed with water to obtain 35.7 kg of concentrate containing 23% and 5.2%, and 64.3 kg of sludge containing 5.9% and 12.6%. Then the washed concentrate is treated with 200 kg of a solution containing 5% PjOj and 0.2% FejOg, at a pH of 2.7 and for 30 minutes. After the separation of the pulp, the solid phase containing 26% PjOy and 4.2%, in the amount of 42.7 kg, is sent to the 1CPO fleet. At the same time, 32 kg of concentrate containing 28.5%, 15% of the yi are obtained. and 4% Fep3, and 10.7 kg of tails containing 15% PjO and 8.8%,.

Waste from the stage of washing ore (64.3 kg) and flotation tailings (10.7 kg) are sent to treatment with sulfuric acid in a working solution containing 1% from the stage of processing the washed ore.

The process takes place at a pH of 0.6,, W: T 3.6 for 50 minutes. Sulfuric acid consumption 40 kg / min. At the same time, 4.7 kg (80% of the original) passes into the solution, the concentration rises to 5%, the concentration 0.2%. Total recovery of 88.5%. The concentrate is directed to mixing with phosphoric acid (8 kg of PgOj.). The resulting phosphate pulp is fed to the BGS apparatus to the substrate and granulation. 34.7 kg of granular activated phosphorus is formed, containing 38.5% p, 050. and 19%,.

The table shows examples of the implementation of the method of obtaining activated phosphate within the proposed limits and with the values of technological parameters beyond the lower 50 and upper limits.

As can be seen from the table, an increase in pH at the stage of sulfuric acid treatment of sludges (example b) and a decrease in temperature (example 7) results in a decrease in the degree of recovery of P.,

I

VNIIPI - Order 1864/23 Circulation 408

which, in turn, in determining the loss of the output of the fertilizer. The pony (Example 5) and the increase in process do not affect, however, it results in sulfuric acid.,

The proposed method p to increase the yield in g products up to 87–90% with iron-containing ores.

Claims (1)

Formula images A process for the preparation of phosphorus with long-acting phosphate crushing with sulfuric acid, granulation and drying is carried out in order to enable low-quality iron ores and increase the yield, crushed phosphate is further subjected to subsequent mixing of the spent waste from the flotation, thickening of the floor and processing to form 30 with the ratio of Fe O / PjOj, 2, sulfuric acid at 1 0.5-0.7 and the resultant p give the treatment of the washed raw material. 35 I 40 45 Subscription Random polygons pr-tie, Uzhgorod, st. Project, 4 which, in turn, leads to an increase in losses and a decrease in its output to the fertilizer. Lowering the pH (Example 5) and increasing the process temperature does not affect the output, however, it results in excessive consumption of sulfuric acid. The proposed method allows to increase the yield in the finished product to 87 - 90% when processing iron-containing ores. Invention Formula A method of obtaining long-term phosphate fertilizer, including crushing of phosphate raw materials, treatment with sulfuric acid, flotation, granulation and drying of the product, characterized in that, in order to enable the processing of low quality iron ores and increase the yield of fertilizer, the crushed phosphate raw material is subjected to additional washing with followed by mixing the resulting waste with a waste. flotation, thickening the resulting mixture and treating the resulting mass with the ratio of Fe O / PjOj equal to 0.7-2, sulfuric acid at 15-29 C with a pH of 0.5-0.7 and the resulting solution is fed to the treatment of the washed phosphate raw material. Subscription