The Preparation Technology Of Potassium Sulfate From The Byproduct Of Iron Oxide Red Production With Pyrite Cinder

Pyrite cinder, a kind of red brown solid waste produced from calcining pyrite in the sulfuric acid production, because contain a large amount of composition that can utilize, so the development and utilization which has got greater degree in the last few years. The utilization efficiency that has not merely improved resources is sent and utilized, have also reduced the pollution of pyrite cinder on environment.The comprehensive utilization to that the pyrite cinder of scientific worker of our country has carried on the research and practice in many aspects, and gain some achievements. Especially in recent years , the research of iron oxide red production with pyrite cinder, have reached it in order to abolish and manage abolishing especially, the purpose to turn waste into wealth , has already had a social benefit and economic benefits, there is a realistic important meaning, it is the most promising comprehensive use ways of pyrite cinder. But the handling problem of the sulphuric acid ammonium solution produced in the course of this craft has not been paid attention to by people all the time , this how research utilize in cook with pyrite cinder is it is it oxidize for raw materials iron oxide red sulphuric acid ammonium waste liquid that produce is it fetch agricultural products potassium sulfate to make among the course to fetch to make on key research.Potassium sulfate is the main variety of potassium fertilizer without chlorine in the world, it account for 5% of potassium fertilizer total output in the world, mainly used in the planting of some crop which like potassium and avoid chlorine, such as tobacco, sugarcane,irish potato,grape,orange,watermelon,tea,pineapple ,etc. It can be used in the growth of seafood, too. Potassium sulfate not only can improve the output of crop, but also can improve the quality of agricultural products, such as the flammability of the tobacco, candy degree of the grape , water-melon, content of starch of potatoes ,etc. Use potassium sulfate in arid district can prevent the harmful to crop chloride from accumulating. Keep giving stable high yields irrespective of drought or water logging The potassium sulfate can also be used for making potassium supersulfate,kainite,potassium soluble glass and potassium carbonate, have extensive uses too in such trades as the medicine , dyestuffs , glass , explosive ,etc.The research make and fetch the potassium sulfate of agricultural fertilizer, Focus on preparing the discussion adding the organic reagent in the craft, in order to improve the K + conversion ratio during the compound reaction of potassium sulfate, improve the feasibility on the craft. Experiment includes four steps: baking of pyrite cinder, vitriol is it fetch to soak, sour infusion and carbonic acid hydrogen ammonium formate, sulphuric acid ammonium and chlorine craft that potassium formate make and fetch the potassium sulfate. Having confirmed the best process conditions at each stages, the best process conditions of formating the sulphuric acid potassium among them are: Raw materials matching is KC1: (NH4)2SO4=2. 1 (Mole ratio); Reaction temperature is 80 degrees Centigrade; Reaction time is 2 hours. It last under it is at response condition K + conversion ratio for 63. 5%, K2O content(%) of the products potassium sulfate is 47. 3%.After adding the best organic amine that the experiment selected.K + conversion ratio by 73. 5% has risen to 92. 6%, K2O content of the products can be up to 50. 3%. Indicate through test, product quality accords with the Grade A demand of national agricultural potassium sulfate.