Method for production of high-activity soil conditioner and co-production of sulfuric acid employing phosphorus gypsum and potassium feldspar

Abstract

The invention relates to a method for production of a high-activity soil conditioner and co-production of a sulfuric acid employing phosphorus gypsum and potassium feldspar. The method comprises the following steps: (1) naturally airing, drying, crushing and sieving phosphorus gypsum, crushing, grinding and sieving potassium feldspar, and grinding and sieving sodium sulfate; (2) mixing the sieved phosphorus gypsum, potassium feldspar and sodium sulfate, adding coal and mixing evenly, so as to obtain a mixture; (3) adding water to the mixture, so as to prepare a spherical material or a block material; (4) sintering the spherical material or the block material at 900-1100 DEG C for 1-3 hours, so as to prepare a sintered clinker; and (5) crushing, grinding and sieving the sintered clinker, adding biochemical fulvic acid potassium powder, mixing evenly, and packaging to obtain a soil conditioner product, and introducing a tail gas in the step (4) into a sulfuric acid preparation system after cooling and removing dust, so as to prepare the sulfuric acid. The residue phosphorus gypsum from acid preparation of phosphate ore is reasonably utilized, and waste is changed into treasures, so that the maximal economic benefits are generated.

Description

technical field [0001] The invention relates to a method for producing a highly active soil conditioner and co-producing sulfuric acid by using phosphogypsum and potassium feldspar, and belongs to the technical fields of environmental protection management and chemical production. Background technique [0002] Phosphogypsum is an inevitable product of phosphate fertilizer production. Therefore, the stacking of phosphogypsum not only pollutes the environment, takes up a lot of land resources, but also brings a heavy economic burden to enterprises. The rational use of waste residues, turning waste into treasure, and optimal production of phosphogypsum The economic benefit is the direction that phosphorus fertilizer enterprises have been striving for. [0003] At present, domestic and foreign enterprises dispose of phosphogypsum by reducing S6+ in gypsum to S4+ with coke under high temperature conditions to obtain sulfur dioxide, which is discharged through kiln gas and then ab...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the shortcomings of the soil conditioner produced in the prior art, such as low nutrient activity, not easily absorbed by crops in the soil, and high energy consumption for producing the soil conditioner, the present invention provides a residue and waste material phosphogypsum and potassium phosphate used to make acid from phosphate rock. Method for co-producing sulfuric acid by producing highly active soil conditioner from stone