Method for producing potassium chloride and co-producing calcium, magnesium, phosphorus and silicon composite fertilizer by potassium feldspar

Abstract

The invention relates to a method for producing potassium chloride and co-producing a calcium, magnesium, phosphorus and silicon composite fertilizer by potassium feldspar. The method comprises the following steps of: preparing materials, crushing and mixing the materials to form raw materials, homogenizing and calcining, and finally preparing potassium chloride and calcium, magnesium, phosphorus and silicon composite fertilizer, wherein the raw materials comprise the components in percentage by weight as follows: 40-46% of potassium feldspar, 30-38% of phosphate ore, 12-16% of dolomite and 9-11% of industrial salt; calcining at 850-950 DEG C, and if a rotary kiln is selected, calcining at 850-900 DEG C; water-quenching red hot clinkers obtained, separating liquid from dregs and concentrating the liquid to obtain potassium chloride; drying, dehydrating and crushing residual solid dregs to 150-200 meshes, and packaging to obtain the calcium, magnesium, phosphorus and silicon composite fertilizer. Compared with the prior art, not only is the sintering temperature reduced by 40 DEG G, but also the calcining cost is reduced by 50% and the yield is improved by 5-6 times.

Description

Technical field [0001] The invention relates to the field of chemical fertilizers, in particular to a method for using potash feldspar to produce potassium chloride fertilizer and co-produce calcium-magnesium-phosphorus-silicon composite fertilizer. Background technique [0002] The use of potash feldspar, sericite, leucite, alunite and other potash-containing ores to produce potash has a history of one hundred years. During the First World War, due to the tight supply of potash fertilizer, potash feldspar and limestone were roasted and leached in the United States, Russia, and Japan. In the middle of the last century, the former Soviet Union, Brazil, South Africa and India successively made potash from insoluble potassium minerals, but these factories stopped production with the development and dumping of cheap soluble potash mines and the cessation of World War II. . my country started the research on this project in the early days of the founding of the People’s Republic of C...

AI Technical Summary

Problems solved by technology

Recently, the Institute of Chemistry, Chinese Academy of Sciences, Nanjing Agricultural University, and Jiangsu Academy of Agricultural Sciences launched "Production and Application of New Multi-Multiple Mineral Fertilizer Silicon Calcium Potassium Fertilizer". The firing temperature reaches 1350°C, and due to the low potassium content, its value is not high, and its transportation cost limits its large-scale production and long-distance sales