SU1392066A1 - Method of producing defluorinized phosphates - Google Patents

Abstract

The invention relates to the production of complex mineral fertilizers and allows them to increase the content of elements assimilated by the plants and to expand the sr base when they are produced. The method is carried out by treating crushed to a size of 10-100 mm of poor chrome ores or their enrichment with 40-45% sulfuric acid with a ratio of raw material and acid of 1.5: 1, dividing the resulting pulp into solid and liquid phases, separating from the solid phase of gangue with grain of up to 0.5 mm, mixing it with the liquid phase and drying to obtain the finished product. The resulting fertilizer is enriched with nutrients, such as magnesium, potassium, iron, and silicon, in the form of silicic acid absorbed by plants.

Description

The invention relates to the production of fertilizer for agriculture and can be used in the chemical industry in the manufacture of complex mineral fertilizers.

The purpose of the invention is to increase the content of elements absorbed by plants in the fertilizer and to expand the raw material base.

The method is carried out by treating crushed 10-100 mm of poor chrome ores or waste of their enrichment with A5% sulfuric acid at a feedstock ratio of 1.5: 1, separation of the resulting pulp into solid and liquid phases, separation from solid phase. As for waste rock with a particle size of up to 0} 5 mm520, mixing it with the liquid phase and drying to obtain the finished product.

Poor chrome ores or their enrichment waste consists of chromite grains and barren rock, while in the empty rock 25 contains 60-70% silicate minerals, which are represented by forsterite, S olivine (Mgj Ge) to SiO. , serpentine Mg, (OH.) and 10-15% of iron minerals, which are represented by Hegite Fe (OH), HFeO aq hydrohetite. Waste rock entering these materials is rich in silica and contains many other components (potassium, magnesium, iron),

The raw material used to obtain the fertilizer is crushed to a particle size of 10-100 mm, its regrinding is impractical due to the additional operational and energy costs.

Sulfuric acid is the active solvent of silicates; it makes it easy to decompose waste rock to form silicic acid. Sulfuric acid with a concentration of 40-45%, therefore, when working with such solutions of sulfuric acid, special equipment is not required.

The ratio of solid to liquid, t, e, the ratio of the quantity of the processed raw material to the quantity of the processing solution, is determined by the size and porosity of the raw material in order to completely wet it. With a mineral size of 10-100 mm obrabot30

35

40

45

50

„55

40–45% concentration of sulfuric acid is carried out at a ratio of 1.5: 1.0, while the surface of the processed raw material is completely wetted

g 10

5 520

25

thirty

35

40

45

50

55

With a solution, a decrease in the T: L ratio does not lead to complete wetting and immersion of the raw material. An increase in the T: W ratio leads to an indefinite waste of sulfuric acid and complicates the process.

During the decomposition of the raw material with sulfuric acid, leaching of metal ions of potassium, magnesium, iron, and the formation of colloidal silicic acid occurs.

The solid phase containing chromite grains is divided into chromites and waste rock in a known manner. When processing raw materials with sulfuric acid, chromite grains, due to the dissolution of the cementitious binder, are freed from waste rock and are a valuable raw material for the production of fire-; The separation of chromites from waste rock eliminates the presence of chromium oxide fertilizer that does not function as a nutrient element. The separated, empty rock with a particle size of 0.5 mm has a highly developed surface and has a high adsorption capacity, and also gives the fertilizer properties of a long-lasting effect over several vegetative periods.

The T: W ratio of 1: 1 waste rock and solution allows to increase the speed and completeness of the coprecipitation of silica gel and sols, as well as potassium, magnesium, iron, and to obtain a pasty mass, which is then subjected to i. The resulting fertilizer is enriched with active substances, such as potassium, magnesium, iron and silicon, in the form of silicic acid, easily digestible by plants. In addition, the maintenance of colloidal silicic acid in the fertilizer improves the physical properties of the soil and thereby promotes better utilization of nutrients and phosphorus.

Example, 1.5 kg of poor chrome ores with a grain size of 10-100 mm are placed in a percolor with a diameter of 150 mm and a height of 450 mm made of organic glass.

The ore is treated with 1 liter of 40% sulfuric acid solution. The processing time is 3 days at normal temperature.

After processing the raw material with sulfuric acid, the solution is separated from the solid

phases. The spent solution is poured through a hose at the bottom of the percolator into a separate container. Volume of solution 0.8 l. Analysis of the solution showed that it contains, g / l: silicic acid 125; magnesium sulfate 228; ferrous sulphate 45; potassium sulphate 7.8. After separation of the solution, the solid

in the form of CrjO, 0.94%, MpO 0.46% and other trace elements.

The proposed method of obtaining complex mineral fertilizer allows, in comparison with the prototype, to increase the content of mobile silica, to increase the composition of the active substances available to plants by

1,200 kg phase unload fertilizer functionality from the first one.

the coltor and direct the separation of chromites from waste rock. After separation of the released chromites from the waste rock, the waste rock is returned to the separated solution to precipitate silica gels and other active elements. Waste rock is a white scaly material consisting of amorphous silica and

intermediate hydrated silicon is 1.5-2 times cheaper.

Cat product with high adsorption capacity and developed surface.

From the obtained amount of waste rock, 0.8 kg of particle size up to 0.5 mm is taken and returned to the separated solution in a T: W ratio of 1: 1. When the waste rock returns to the solution, precipitation of silicic acid and metal ions occurs. The resulting mixture is dried for evaporation of excess moisture. When drying, fertilizer becomes loose and caking is prevented. According to chemical analysis, it was established that the obtained mineral fertilizer weighing 1,100 kg contains: SiOj 36.9%, of which mobile silica 56.3%, MgO 32.8% of them absorbed magnesium 98.4%, 21.6 %, of which mobile iron is 46.8%, 2.1%, of which digestible potassium is 99.2%, the rest is additional substances

At the same time, poor substandard chromite ores and chromic ore dressing waste are produced in the processing of chromite concentrate, which is an important industrial raw material. The method is a waste-free technology for the processing of chrome ores to produce two valuable products — a complex mineral that is conveniently obtained using a prototype of recyclable chromite concentrate.

Claims (1)

The invention of the method of obtaining a complex mineral fertilizer by treating the feedstock with mineral acid, followed by separation of the pulp into the solid and liquid phases and their processing, in order to increase the fertilizer content of the plant-derived elements and expand the raw material base. raw materials are used poor chrome ores or their beneficiation, crushed to a particle size of 10-100 mm, and 40-45% sulfuric acid is used as a mineral acid, and the treatment is carried out at a ratio of and raw materials: acid of 1.5: 1, and from the resulting solid phase is separated gangue size up to 0.5 mm, which is mixed with the liquid phase at a ratio of 1: 1 and dried.