SU1527226A1 - Method of producing phosphorus-containing fertilizer - Google Patents

Abstract

This invention relates to the production of phosphate fertilizers, in particular simple superphosphate. The purpose of the invention is to increase the degree of transition of phosphorus into an assimilable form and reduce the cost of the target product. The method of obtaining phosphate fertilizer from chamber superphosphate includes its two-stage neutralization, storage maturation between these stages, granulation and drying of the product. At the same time, the neutralization of the chamber superphosphate in the first stage is carried out with glauconite wastes of phosphorite quarries in the amount of 0.04 - 0.06 t / t of superphosphate, and in the second stage with known new wastes of the same quarries. 1 tab.

Description

This invention relates to the production of phosphate fertilizer, in particular simple superphosphate.

The purpose of the invention is to increase the degree of transition of phosphorus into an assimilable form and reduce the cost of the target product.

The method of obtaining phosphate fertilizer from chamber superphosphate includes its two-stage neutralization, storage maturation between these stages, granulation and drying of the product, while the first stage gel neutronization of the chamber superphosphate is carried out with green phosphate quarries in quantity

0.04-0.06 tons per 1 ton of superphosphate, and in the second stage - lime waste of the same quarries

These wastes are generated by the extraction of phosphorite ore by the open method, for example, in the quarries of the software of Estonphosphorite or of the Kingisepp software of Phosphorite. Glauconitic waste glauconitic sandstone or concentrate of its enrichment is a fossil-related fossil phosphate rock containing 1.2–9%, 13.73–20.34% Fe, 0 ,, SiO, CaO, the rest that is currently being thrown out to dump Neutralization of warehouse superphosphate glaucosd to to

ABOUT)

nitric waste is carried out as a result of the reaction of the interaction of free phosphoric acid with the mineral glauconite, which is found with a hydroapyumosilicate of complex composition of the general formula (BUT IO (3-4) H20 (where -, BUT - CaO, MgO, R20, -, FcjO ,), as well as with clay and carbonate components of glauconitic sandstone.

A positive effect compared with the known method, in which phosphate concentrate is used at this stage, is achieved due to the lower rate of interaction of the components of glauconite waste with free phosphoric acid, especially in the initial stage of contact. As a result, the concentration of phosphoric acid during storage its high level and to a greater extent its reaction with the undecomposed part of apatite. This leads to an increase in the proportion of the absorbed form of phosphorus in the total amount it wa made by apatite.

In the second stage of superphosphate neutralization, limestone wastes from crushed stone crushed stone quarries are used. These wastes are used. are low-quality carbonate-containing compounds containing 60-80% calcium and magnesium carbonates (10-14% of the total carbonates are MgCO). Example 1 about 1 kg of chamber superphosphate from Estonphosphorus PO is kept in a sealed package for 3 days, then it is mixed in a porcelain mortar with glauconite phosphate / quarry waste in an amount of 0.04 kg. Superphosphate contains 20.12% .8.0% of barb. and 1.9% H2.0, glauconitic waste - 20.34% and 8.98%. The mixture is stored in a plastic bag for 7 days and stirred after 3 and 5 days (1 stage of neutralization). As a result of 7-day storage, the mixture contains 6.8%, and 0.047 kg of phosphate rock limestone waste, the total alkalinity of which is 41.75% in terms of CaO, is added to your K b. The mixture is stirred for 15 minutes in a porcelain neutralizer with a diameter of 208 mm and a volume of

five

0

five

0

five

0

five

0

five

5.1 l, as a result of which its acidity decreases to 2.82% of Р „0.„

.t- J in about

(Stage II neutralization). Then the mixture is granulated on a disk granulator with a diameter of 0.55 mm to obtain granules of 1–4 mm in size and dried in a drying cabinet at 105 C. The product contains 2.3% 1.75% of moisture, 19.EI 19.60% The degree of transition of phosphorus into the digestible form is 94.19%.

EXAMPLE 2: The experiment is carried out analogously to Example 1. The amount of the glaciated concentrate is 0.06 ton / ton, and lime waste — 0.043 ton / ton. After the first and second stages of neutralization, the acidity of the superphosphate is 5.7 and 2.6%, respectively, P OgcBop. The product contains at a humidity of 2.7% 1.51% free and 19.26% UCB. The degree of transition of phosphorus into the digestible is 94.22%.

The same experiment was conducted on the basis of a superphosphate containing 21.19%, 8.7% PuOffcBoeH 11.26%. In the first stage of neutralization, glauconitic sandstone is used in an amount of 0.06 tUt, and in the second stage, limestone waste in an amount of 0.042 t / To. Glauconitic sandstone contains 5.07% and 2.94%. The final product with a moisture content of 2.6 liters contains 19.59% and 1.0% Prj Ogj-goB. The degree of phosphorus transition into the digestible form is 91.91%. The effect of the amounts of glauconitic and limestone wastes in the neutralization of the free acidity of the chamber superphosphate on the degree of transfer of phosphorus to the digestible is presented in the table.

When using glauconitic waste in an amount of more than 0.06 t / t - the dilution of the product occurs,. and its quality is reduced. When using this waste in an amount of less than 0.04 t / t, the depth of neutralization is low, which leads to a decrease in product quality due to an increase in the required amount of limestone waste. The rate of lime waste is determined by the initial and specified final content of 5 in the product of its total alkalinity, which in terms of CaO is 40-45%. Specific rate of lime waste / calculation is determined

80% of the stoichiometric amount needed to reduce acidity to

0% PiOgceoB.

Unlike shale ash used in the known method, the use of limestone wastes is accompanied by the formation of acidic magnesium orthophosphate with high thixotropic properties during neutralization of phosphoric acid, which, in turn, is not inferior to the strength of granules by the known method.

From the data presented in the table it follows that the highest degree of transition of phosphorus into the absorbed form, reaching 94.2% (88-90.5% by a known method), is observed when using glauconite waste in the first stage of neutralization of the superphosphate in the amount of 0.04-0.06 tons per 1 ton of superphosphate. The use of this waste leads to a decrease in the cost of the product from 223.5 rubles / ton (a known method) to 214.2 rubles / ton.

The advantages of the proposed method:

production is significantly cheaper;

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the quality of the fertilizer is increased by reducing the hygroscopicity, increasing the strength of the granules and the additional content of the nutrient potassium;

a significant amount of high-quality phosphate concentrate used by Q in a known process is released;

the complexity of the use of minerals in phosphate rock mines, which are now being dumped, is increasing.

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Claims (1)

Invention Formula A method for producing phosphate fertilizer from chamber superphosphate, including its two-stage neutralization, storage maturation between these stages, granulation and drying of the product, distinguishing with the fact that, in order to increase the degree of phosphorus conversion into an assimilable form and reduce the cost price of the target product, neutralization of the chamber superphosphate at the first stage leads to glauconitic waste - phosphorite quarries in the amount of 0.04-0.06 tons per 1 ton of superphosphate, and in the second stage - with lime waste of the same quarries The proposed method