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Fertilizer from Alumo-Silicate

#A-1478


Development of Method of Obtainment of Slow And Extended-Action Fertilizer from Alumo-Silicate Containing Potassium, Calcium, Magnesium Capable Absorbing Soluble Fertilizers with Steep Reduction of Their Losses

Tech Area / Field

  • CHE-IND/Industrial Chemistry and Chemical Process Engineering/Chemistry
  • ENV-EHS/Environmental Health and Safety/Environment
  • OTH-AGR/Agriculture/Other
  • AGR-OTH/Other/Agriculture

Status
3 Approved without Funding

Registration date
04.12.2006

Leading Institute
Institute of General and Inorganic Chemistry, Armenia, Yerevan

Supporting institutes

  • Armenian State Agrarian University, Armenia, Yerevan

Collaborators

  • Washington State University / Department of Crop and Soil Sciences, USA, WA, Pullman\nCalifornia State University, Fresno, USA, CA, Fresno\nAgriculture and Agri-Food Canada, Canada, ON, Ottawa

Project summary

Study of the physical-chemical bases and development of new technology of obtainment of slow and extended-action fertilizer from potassium-containing alumo-silicates containing potassium, calcium, magnesium and capable absorbing soluble anions with steep reduction of their losses; study of the agrochemical properties and efficiency of the synthesized fertilizer in lab-scale, vegetation and field conditions as well as field demonstration tests are outlined within the framework of this project.

As it is known, over 90 per cent of the potassium fertilizers produced in the world are chlorides, which is conditioned by the chemical compositions of the basic potassium-containing deposits, as well as by the far cheaper fertilizer obtainment technology.

Disadvantage of potassium chloride is the high content of chloride. Chloride accumulation is harmful both for the soil and for the plants. Chloride reduces general and gustatory qualities of many farm goods (tobacco, potato). Ecologically, chloride ion, passing to the ground waters is considered dangerous.

Water-free potassium-containing alumo-silicates, potassium feldspars (orthoclase), nepheline syenites, leucites, synnerites have industrial importance.

Tejsar alkaline complex (Armenia), Ishim alkaline complex (Kazakhstan), alkaline formations of New Hampshire (USA), synnerite deposites of Altai region (Russian) are perspective potassium-containing sources.

However, in these rocks, K2O and other useful elements are plant-inassimilable. Their assimilation is linked with the creation of integrated plants for processing minerals along with the infrastructure which demands considerable investments.

Influence of the products of processing of synnerites, potash and potassium silicate with potassium chloride and sulphate has been tested in lab, vegetation and filed conditions.

It was shown, that they could serve as potassium fertilizers, especially in acid soils. Yet, potash and potassium silicate, obtained by the above-mentioned method, are enough costly to be applied practically.

Consequently, development of new, effective methods of processing of named rocks to obtain chloride-free fertilizers is very important, because these minerals are accessible in many countries.

A new, original method have been developed In the Mineral Salts Lab of the Institute of General and Inorganic Chemistry (IGIC) of the National Science Academy of the Republic of Armenia to process these rocks allowing to obtain fertilizer where potassium, calcium and magnesium are in plant-assimilable form. Proposed method has been tested on dacite tuffs, containing up to 15.2 per cent K2O, technology is wasteless with little demand in investment costs. Agro-chemical properties of the fertilizers obtained from dacite tuffs have been studied in the Agrochemical lab of the State Agrarian University of Armenia (SAUA). Field and vegetation tests have been conducted in various soil and climate zones of Armenia. Obtained results showed that potassium, phosphorous and partially calcium and magnesium turn into mobile form, i.e. become plant-assimilable. Besides, they possess the following positive peculiarities:

  • Retain water;
  • Absorb anions and cations, which could substitute other ions;
  • Bond heavy metals (Pb, Cu, Hg, As, etc.) in non-exchangeable manner. These elements do not penetrate into the plant yielding crops which are free of harmful elements.

Above given properties permit to use the synthesized fertilizers together with soluble fertilizers containing nitrogen, phosphorous, with drastic reduction of their leakage in field conditions.

The obtained fertilizers are environmentally friendly. They especially are efficient in acidic and low magnesium- and calcium-scarce soils, thus reducing the factual acidity, enhancing exchange-absorbance bases of Ca and Mg and saturating the soil with alkali. This fertilizer could be used in areas where there is a risk of contamination of water basins.

Successful project implementation would result in the development of theoretical bases as well as the technology for the obtainment of slow and extended-action fertilizer from potassium-containing alumo-silicate ores and demonstration of agrochemical efficiency of these fertilizers in field conditions.

A new, effective direction of synthesis of potassium fertilizers from potassium-containing alumo-silicates ores would be worked out for the farming needs.

According to the data available in the Ministry of Agriculture of the Republic of Armenia, the demand in proposed fertilizer only in Armenia amounts to 30–40 ton.

Crop yield gain, in this case, would amount to 10–15% comprising several million dollars.

Business plan would worked be out when the process flowsheet, expense norms and selection of the equipments would be in place.

The business plan would be offered to Ministry of Agriculture of the Republic of Armenia with a request to assist the industrial production and marketing of the named fertilizer (the preliminary consent is available).

Other objectives have to be resolved during Project implementation:

  • Reorienting the science team for meeting peaceful ends;
  • Provide scientists with peaceful alternative research;
  • Integration of the weapon scientists into the world science community;
  • Facilitate in solving international, national and economic problems.

The Project participants took part in the development of:
  • Alkaline autoclave processing of nepheline syenites;
  • Theoretical bases and technology development for the obtainment of wollastonite by the causticization of alkaline-silica liquors by the calcium hydroxide (so-called Soviet method);
  • Physical-chemical bases and technology development for the obtainment of - and -gypsum from phosphor- gypsum and its granulation. This work has been developed during the implementation of ISTC Project #A-714 titled: "Wollastonite and Jewelry Casting Molds Blend Technology Development from -Tridymite and -Cristobalite Obtained by Low Temperature Technology" and applied in industry;
  • Intensive farming methods to raise cereals, vegetables and fruits which have been applied industrially by the decision of Scientific-Technical Council of the Ministry of Agriculture of the Republic of Armenia.

Project participants are highly skilled specialists in the field of inorganic chemistry and technology, agro-chemistry as well as in the field of weapon R&D.


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ISTC facilitates international science projects and assists the global scientific and business community to source and engage with CIS and Georgian institutes that develop or possess an excellence of scientific know-how.

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