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

Abstract

The invention relates to a method for producing potassium sulphate 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 sulphate and calcium, magnesium, phosphorus and silicon composite fertilizer. According to the method provided by the invention, compared with the prior art, not only is the sintering temperature reduced by 200 DEG G, but also the calcining cost is reduced by about 40% and the yield is improved by 4-5 times. The method is suitable for middle and medium enterprises in potassium feldspar, gypsum, apatite, cadmia or dolomite mineral resource areas to produce potash fertilizers and calcium, magnesium, phosphorus and silicon composite fertilizers.

Description

technical field [0001] The invention relates to the field of chemical fertilizers, in particular to a method for producing potassium sulfate fertilizer by using potassium feldspar to co-produce calcium, magnesium, phosphorus and silicon multi-component compound fertilizer. Background technique [0002] The research of using potassium feldspar to produce potash fertilizer has a history of more than 100 years. During World War I, due to the shortage of potash fertilizer supply, potash feldspar and limestone were used to make potash fertilizer in the United States, Russia, Japan and other countries. In the middle of the 20th century, the former Soviet Union, Brazil, South Africa and India successively extracted potassium salts from insoluble potassium minerals to make potassium fertilizers, but there was no major breakthrough. There are many ways to decompose potassium feldspar, which can be divided into volatilization and roasting according to the decomposition methods. The le...

AI Technical Summary

Problems solved by technology

In the last ten years, due to the high price of potassium fertilizers, the research on making potassium fertilizers from potassium feldspar has become more active. For example, Xue Yanhui of Shandong University of Science and Technology proposed a method of using a catalyst to decompose potassium feldspar at low temperature to produce potassium sulfate, and at the same time by-product white carbon black and hydrogen oxidation. Aluminum; Changsha Design and Research Institute of Chemical Industry proposed "wet decomposition method of potassium feldspar ore" ZL96118069.2; "flotation separation technology of wet decomposition material of potassium feldspar ore" 97108312.6. Pollution to the environment and high energy consumption, complex process, long product chain, and the safety production of high-risk items such as concentrated sulfuric acid is worrying

The Institute of Chemistry, Chinese Academy of Sciences, Nanjing Agricultural University, and Jiangsu Academy of Agricultural Sciences launched the "Production and Application of New Multi-Multiple Mineral Fertilizer Silicon Calcium Potassium Fertilizer". The formation temperature is as high as 1350°C, which limits its large-scale application