Normal-temperature production method for ferrous sulfate monohydrate

Abstract

The invention discloses a normal-temperature production method for ferrous sulfate monohydrate, which comprises the following steps of: mixing ferrous sulfate heptahydrate crystal and water-soluble organic dehydrating agent in a closed container in a mass ratio of 1:4-1:10 at normal temperature, fully stirring the mixture for 0.5 to 10 hours, dissolving and removing crystal water from the ferroussulfate heptahydrate crystal by using a water-soluble organic solvent, and drying the ferrous sulfate heptahydrate to obtain a ferrous sulfate monohydrate product. The method has the advantages that:the method is operated at normal temperature under normal pressure, has simple process and low energy consumption, and is simple and convenient to operate; when the obtained ferrous sulfate monohydrate powdery product with purity of 95 to 99 percent is exposed in the air for over 72 hours, the product is not easy for deliquescence or agglomeration, and has stable quality; the obtained ferrous sulfate monohydrate granular product is not easier for deliquescence or agglomeration, and is easy for storage; the dehydrating agent is an organic neutral solvent, so the dehydrating agent has no acid or alkali corrosion, and has no special requirement for the equipment; and the production process does not produce wastewater, so the method does not pollute the environment and is convenient for production control and large-scale continuous production.

Description

technical field [0001] The invention relates to the technical field of producing ferrous sulfate monohydrate, and relates to a method for producing ferrous sulfate monohydrate at normal temperature. Background technique [0002] Ferrous sulfate monohydrate, molecular formula FeSO 4 ·H 2 O is a non-toxic, odorless off-white to beige powdery substance with an astringent taste; the iron contained in ferrous sulfate monohydrate is the raw material for the synthesis of hemoglobin antibodies in animals, and can be used as a feed grade mineral feed additive It is used as a blood tonic agent for raising poultry and livestock, which can promote the growth and development of poultry and aquatic animals, enhance disease resistance, and increase feed remuneration; ferrous sulfate monohydrate can also be used to make iron oxide red and other pigments; it is used for weed control in agriculture fertilizer, soil improver and foliar fertilizer, etc. Granular products are very popula...

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Problems solved by technology

[0005] In the above-mentioned patent documents, the Chinese patent document of publication number CN1110665A uses sulfuric acid as forced dehydrating agent, with the forced dehydration in sulfuric acid dehydrating agent heptahydrate ferrous sulfate solution; Publication No. The Chinese patent literature of CN1275533A needs to heat and stir the solution within the range of pH value 2-5.5; the production process of these two patents requires high corrosion resistance of equipment, high equipment cost and high production cost

[0006] In the Chinese patent literature of publication number CN1762833A, the Chinese patent literature of publication number CN1986428A, the Chinese patent literature of publication number CN101148272A, relate to 380-500 ℃ rotary kiln respectively Medium and high temperature operations such as heating, dissolution and crystallization, drying and roasting, etc., the energy consumption of the production process is relatively high

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