Method for producing potassium sulfate by utilizing insoluble rocks containing potassium
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A technology of potassium rock and potassium sulfate, applied in the field of development and utilization of insoluble potassium-containing rock, can solve the problems of high temperature, complicated process, low recovery rate, etc., and achieve the effect of effective utilization, high reaction yield and easy control
Inactive Publication Date: 2014-01-29
GUIZHOU YUANSHENG POTASSIUM TECH
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Problems solved by technology
To sum up, in the existing technology to extract potassium from insoluble potassium-containing rocks, there are problems such as high temperature, high energy consumption, low potassium content, complicated process, and low recovery rate.
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Embodiment 1
[0033] (1) Treat 50g of 200-mesh potassium-containing rock powder with 200ml of 1% dilute hydrochloric acid, filter and dehydrate;
[0034] (2) Add the potassium-containing rock powder in step (1) into 500ml of 20% NH 4 In the reaction kettle of the F solution, stir and heat, react at a temperature of 95°C to 105°C, and collect the evaporated ammonia and water vapor with an absorption bottle;
[0035] (3) After reacting for 2 hours, the reactant is filtered, and the filtrate is returned to step (2) for recycling, and the solid is dried for later use;
[0036] (4) The solid obtained in step (3) and 40g of 98% concentrated sulfuric acid are subjected to an acid hydrolysis reaction at a temperature of 190°C to 200°C, and the volatilized fluorine-containing gas is defoamed and passed into the ammonia water collected in step (2);
[0037] (5) Dissolve the acidolysis solid product obtained in step (4) with 200g of water, filter and wash;
[0038] (6) The filtrate obtained in step ...
Embodiment 2
[0040] (1) Treat 50g of 200-mesh potassium-containing rock powder with 200ml of 1% dilute hydrochloric acid, filter and dehydrate;
[0041] (2) Add the potassium-containing rock powder in step (1) into 500ml of 20% NH 4 In the reaction kettle of the F solution, stir and heat, react at a temperature of 95°C to 105°C, and collect the evaporated ammonia and water vapor with an absorption bottle;
[0042] (3) After reacting for 1 hour, the reactant is filtered, and the filtrate is returned to step (2) for recycling, and the solid is dried for later use;
[0043] (4) Perform acidolysis reaction on the solid obtained in step (3) and 40g of 98% concentrated sulfuric acid at a temperature of 175°C to 190°C, and pass the volatilized fluorine-containing gas into the ammonia water collected in step (2) after defoaming ;
[0044] (5) Dissolve the acidolysis solid product obtained in step (4) with 200g of water, filter and wash;
[0045] (6) The filtrate obtained in step (5) is adjusted...
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Abstract
The invention relates to a method for producing potassium sulfate by utilizing insoluble rocks containing potassium. The technological process comprises the following steps: (1) pretreating the insoluble rocks containing potassium; (2) treating the insoluble rocks containing potassium by use of ammonium fluoride; (3) filtering a product treated with the ammonium fluoride; (4) performing acidolysis on the product obtained after treatment based on ammonium fluoride; (5) dissolving the product obtained after treatment based on sulfuric acid in water; (6) performing fractional precipitation by regulating the pH (Potential Of Hydrogen) so as to obtain a potassium sulfate solution; (7) regenerating and recycling an ammonium fluoride solution. Potash feldspars K(AlSi3O8) are mainly taken as the rocks containing potassium. Rubidium feldspars and cesium feldspars, which are utilized to replace the potash feldspars, are used for producing rubidium sulfate and cesium sulfate by utilizing the process and the process condition which are provided by the invention. The insoluble rocks containing potassium are converted into acid-soluble solids by use of ammonium fluoride, so that the potassium sulfate is obtained after the acid-soluble solids are acidified by the sulfuric acid; meanwhile, other elements in the rocks are effectively utilized. The ammonium fluoride is recycled in the whole technological process. The technological process is low in temperature, easy to control and high in reaction yield.
Description
technical field [0001] The invention belongs to the technical field of development and utilization of insoluble potassium-containing rocks. In particular, it relates to a method for producing potassium sulfate from insoluble potassium-containing rocks. Background technique [0002] Potassium is one of the macronutrient elements necessary for the growth and development of crops. It can enhance the ability of crops to resist adversity and promote the formation of good quality of crops, so it is regarded as a "quality element". Potassium is called one of the "three elements of fertilizers" because soil potassium cannot meet the requirements of crops in many cases and potassium fertilizers need to be applied. my country is seriously deficient in potassium, and more than 70% of the arable land needs to be supplemented with potassium. About 8 million tons of pure potassium fertilizer is needed every year, and the actual amount of potassium sulfate is about 15 million tons. The p...
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