Method for decomposing potassium feldspar to extract soluble potassium

Abstract

The invention discloses a method for decomposing potassium feldspar to extract soluble potassium, comprising the following steps of: crushing and grinding potassium feldspar used as a raw material; mixing with the ground potassium feldspar, calcium chloride and sodium chloride which are used as a combined assistant, and fully stirring, wherein the ratio by mass part of the potassium feldspar to the calcium chloride to the sodium chloride is 10:(7-11):(1-6); roasting the mixture at the temperature of 750-900DEG C for 20-80 minutes; leaching the product with water; and evaporating, condensing and separating the filtered filtrate to obtain a potassium chloride product. The potassium chloride product can be used for producing potassic fertilizer; and main components of filter residue are anorthite and soda feldspar which can be used for producing cement, microcrystalline glass and other building materials. In the method, the selected assistant has low price and wide sources and the obtained potassium extract rate is high; in addition, the method is applicable for the production of extracting the potassium from the potassium feldspar.

Description

technical field [0001] The invention relates to the comprehensive utilization of resources in the fields of mining, metallurgy, chemical industry, environmental protection and the like, in particular to a method for decomposing potassium feldspar to extract soluble potassium. Background technique [0002] my country is a country that is extremely short of soluble potassium resources. The development of a simple process, low energy consumption, high recovery rate, and environmentally friendly process for decomposing and extracting soluble potassium from potassium feldspar is the bottleneck of realizing the production of potassium fertilizer from potassium feldspar with huge reserves. and difficulties, and the selection and preparation of decomposition aids is particularly critical. At present, both hydrofluoric acid and sodium hydroxide are effective additives for decomposing potassium feldspar, but they are too corrosive and relatively expensive compared to raw materials. Mos...

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Problems solved by technology

Calcium chloride alone can be used as an auxiliary agent to extract soluble potassium by immersion of potassium feldspar (Peng Qingjing et al., 2003, Research on the process of extracting potassium from calcium chloride immersion potassium feldspar), and the required roasting temperature is 870-960°C , the roasting temperature is high, the roasting time is long, and the energy consumption is large

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