Process for preparation potassium salt for plant ash

Abstract

The invention relates to a method for preparing sylvite from plant ash, which is characterized in that the plant ash is put into a vessel, water with the weight which is more than twice of the weight of the plant ash is added into the vessel for carrying out fully stirring for 10 minutes to 20 minutes, potassium hydroxide with the weight which is 0.2 percent to 5 percent of the total weight of the plant ash and the water is added for carrying out fully stirring for 10 minutes to 20 minutes, the PH value of the plant ash solution is adjusted to 10 to 14 for sedimentation to remove other impurities, and colorless, transparent and pure solution is obtained after fine filtration; the solution filtered is put into a reaction kettle, 2 percent to 5 percent of selected acid in which the content of the plant ash and the water is 10 percent to 50 percent of the total weight is added according to preparation requirements and the measure value of the potassium ion in the plant ash for carrying out fully stirring for 10 minutes to 20 minutes, and the PH value is adjusted to 4 to 5; heating is carried out for vaporizing the water in the solution, a centrifuge is used for dehydration till the water content is less than 5 percent, and then product obtained is crashed into 50-mesh to 200-mesh fine powder and the sylvite is obtained. The plant ash used as the raw material in the invention is economic and environment-friendly, thereby having great benefit and grand development prospect.

Description

A local method for preparing potassium salt from plant ash technical field A method for preparing potassium salt from plant ash. Background technique Raw material Potassium is an indispensable and important raw material in many industrial fields such as food industry, pharmaceutical industry, and agricultural fertilizer. my country's raw material potassium salt mainly comes from a few natural lakes, and its output is seriously insufficient compared with the demand of industry and agriculture, which cannot meet the demand of materials for industrial and agricultural production. At present, our country solves the problem of insufficient supply of raw material potassium salt, mainly through importing from abroad. According to statistics, my country's dependence on potassium salt as raw material imported from abroad is as high as 70%, which poses a huge constraint on my country's industrial and agricultural fields that use potassium salt as raw material, and cannot meet the ...