SU1071616A1 - Process for producing fertilizer containing boron - Google Patents

Description

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ABOUT)

This invention relates to a process for the production of boron fertilizers widely used in agriculture. A method of producing fertilizer with boron is known by introducing a boron-containing additive into the phosphate part (ammophos). As the latter, an intermediate PRODUCT produced by type of SI plugs is used.

The disadvantage of this method is that, along with plant nutrition for plant elements, this product also contains a significant amount of toxic substances (As, Pb, 8).

The closest to the technical essence of the invention and the achievement of the result is the method of obtaining fertilizer with boron, including the introduction of the boron-containing component into the phosphate part and the subsequent granulation and drying of the product. As a boron-containing additive, borax, ammonium borate, alkali or alkaline earth elements are introduced into fertilizers together with a neutron with a substance, for example, chalk or added x 1 at a pH of 4-4.5. The ratio, and In 1: 0,005-0,009 121.

The disadvantage of this method is the low strength of the granules and the improved caking of the product. For example, when producing fertilizers based on superphosphate, the strength of the granules does not exceed 10-12 kgf / cm, and the caking of fertilizers obtained 1c: x based on ammophos or nitroammophos, 0.55 and 0.75 kg / cm, respectively.

The purpose of the invention is to increase the strength of granules and reduce the caking of the product.

This goal is achieved in that according to the method of producing fertilizer with boron, including the introduction of the boron-containing component c. the phosphate part and the subsequent granulation and drying of the product; as a boron-containing additive, a boron-salt concentrate is introduced at a ratio of 5 ijfO, 01-0.025 and a pH of 0.1-3.

In the preparation of the superphosphate-based fertilizer, the additive is introduced before the product is granulated and mixed for 15-20 minutes.

In the preparation of fertilizers from ammophos and nitroammophosca, the additive is introduced into acid or partially hypersing pulp.

As boron-containing additives 5, boron salt can be used.

concentrates, ia example brdatolito-. What is the concentrate or concentrate obtained from the Inder ore beneficiation? The boric salt concentrate is a mixture of calcium and magnesium borates with polyggshite. Boracite, Caliborite and Other Mineralgichs When boric coicentrate is introduced into the acidic medium, it dissolves in acids and forms a number of soluble salts, and ammonia complexes are formed during the ammoniation of ammonium compounds, which lead to the formation of salt-bridges. In this case, the complexing agents. Not only Co.: Bor is harvested, but other components included in the additive. It is also possible to form solid, solutions and a number of double salts, as well as to improve the quality of fertilizers. The formation of complex clusters occurs directly in the process of obtaining fertilizers, which contributes to a more reliable connection with the components of fertilizers.

The feasibility of the selected grade of boron and boron in the supplement is reflected in Table. 1. T and l and c and 1

As can be seen from the table. 1, in the case of obtaining a boron-containing fertilizer based on .a ' yofocai and nitroammofosca, with an increase in boron above 0.25, there is a noticeable increase in the caking of the fertilizer, and the strength practically does not change. With a decrease in the proportion of boron, a sharp increase in caking occurs: the fertilizer quality and the granule strength decrease.

In the case of obtaining a yield based on superphosphate, which is a non-surviving fertilizer, a change in the proportion of boron affects the strength of the obtained granules.

In tab. 2 shows the results of experiments carried out. At the same ratio P {.Oy: B, but with a change in the pH of the medium, boron-containing was introduced into KOTopiyro. additive ..

table 2

As can be seen from the table. 2, with an increase in the pH of the institute over 3, the caking of fertilizers increases and the granule strength decreases. When producing superphosphate-based fertilizer, the time of re-entrapment of the latter with the boron-containing additive introduced before the granulation into the acid product is of great importance. Mixing time The strength of the granule of the additive from the finished product, kgf / cm perphosphate, min. Thus, with a decrease in the mixing time below 15 minutes, the yield strength of the finished product pellets decreases, and an increase over 20 minutes is not economically feasible. Example 1. 1900 kg of chamber superphosphate after l decomposition in a warehouse mix pH of pH 3 with 71 kg of borosalt concentrate. The ratio is 1: 0.01. Reagent mixing time 15 min. The mixture is then neutralized with lime, granulated and dried. Get 1855 kg of the finished product. Durability of granules is 20 kgf / cm-. Example 2. 2600 kg of chamber double superphosphate are mixed at pH 2 with 236.25 kg of boron salt concentrate. The ratio of PfOj: B 1: 0.025. Mixing time 20 min. The mixture is then neutralized with lime, the mixture is granulated and dried. Get 2690 kg of the finished product. Durability of granules 23 kgf / cm -. The product does not cake. Example 3. 1000 kg of phosphoric acid with a content of 52% P OjCpH 0.1) is mixed with 74.9 kg

boron concentrate The ratio of 1: 0,015. The mixture is ammoniated with ammonia to pH 5.0. The resulting pulp is evaporated, granularit and dried. Caking of the finished product 0.18 kg / cm, the strength of the granules 33 kgf / cm.

PRI me R 4. 336.6 kg of ammonium phosphate pulp with a pH of 1.8 is mixed with 77.4 kg of datant boron concentrate. The ratio of P2O $: B 1: b, 01; 2. The mixture is monitored to pH 5.0. 409.47 kg of 95% ammonium nitrate melt and kg of potassium chloride are added to the pulp. The resulting mixture is granulated and dried. Caking of the product is 0.47 kg / cm, the strength of the granules is 20 kgf / cm.

The use of the proposed method will reduce caking fertilizer, amoluphos based on ammophos and Nitro-1 a4ofoski from 0.55 and 0.75, respectively, to 0.15-0.20 kg / cm and 0.400, 50 kg / cm and increase strength. granules for all types of fertilizers 1.5-2 times.

Claims (3)

1. METHOD FOR PRODUCING FERTILIZER WITH BORON, including the introduction of a boron-containing component into the phosphate portion and subsequent granulation and drying of the product, which consists in the fact that in order to increase the strength of the granules and reduce the caking of the product, boron salt is added as a boron-containing additive concentrate at a ratio of P _t Oj: B equal to 1: 0.01-0.025, and a pH of 0.1-3. 2. The method according to claim 1, with only one skinny one, that upon receipt of superphosphate-based fertilizers, the additive is introduced before granulation of the product and mixing is carried out for 15-20 minutes. 3 .. The method according to claim 1, on the other hand, 4τοΐ upon receipt of fertilizers. Based on ammophos and nitroammophoski, the additive is introduced into acid or partially ammoniated pulp. d brine, fusion of boron-containing component c. phosphate portion and subsequent granulation and drying of the product, in quality ^; A boron-containing additive is injected with a boron salt concentrate at a ratio of PrO ^: B 1-0.01-0.025 and a pH of 0.1-3. Upon receipt of a fertilizer based on superphosphate, the additive is introduced before granulation of the product and mixing is carried out for 15-20 minutes. 10 Upon receipt of fertilizers based