Method for preparing agricultural potassium sulfate from potassium-rich rock
A technology of potassium-rich rock and potassium sulfate, which is applied in the field of production of agricultural potassium sulfate, can solve the problems of dependence on imports of potassium sulfate raw materials, limited production capacity of potassium sulfate, and shortage of water-soluble potassium ore resources, achieving significant economic benefits and low product cost. The effect of low and high resource utilization
Active Publication Date: 2011-03-30
CHINA UNIV OF GEOSCIENCES (BEIJING)
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Problems solved by technology
Domestic production capacity of potassium sulfate is limited, and most of them rely on imports. The reason is that domestic water-soluble potassium ore resources are extremely scarce, and raw materials for the production of potassium sulfate are heavily dependent on imports.
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Embodiment 1
[0025] like figure 1 As shown, it is required to grind the potassium feldspar powder to -200 mesh, fully mix it with sodium carbonate at a weight ratio of 1:1.5, and then calcine it in a calcination furnace with a calcination temperature of 800°C and a calcination time of 2 hours. , to obtain off-white to light green semi-sintered clinker powder. At the same time, the gas recovery device installed above the calcination furnace will recover the CO generated during the calcination process. 2 The tail gas is recovered and recycled through the scrubber to remove dust and purify.
[0026] After the above-mentioned clinker powder is further ground, water is added in parts by weight according to the ratio of powder to water of 1:8 and fully stirred until the pH value of the mother liquor is 8.5. The form precipitated and was filtered to obtain a potassium-containing mother liquor. Potassium-containing mother liquor is passed through excess CO recovered above 2 Gas, until the pH v...
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The invention discloses a method for preparing agricultural potassium sulfate from a potassium-rich rock. The method comprises the following steps of: performing crushing and mineral separation on the potassium-rich rock so as to prepare powder taking potassium feldspar as a main phase; grinding mixed powder of potassium feldspar powder and sodium carbonate, calcining at the temperature of between 700 and 900 DEG C, adding a proper amount of water into the calcined clinker powder, and fully stirring and mixing for water leaching; filtering and separating, introducing excessive CO2 into the filtrate for an acidification and neutralization reaction, and filtering the precipitate, wherein the solution is mainly solution of mixed potassium and sodium salt; evaporating, crystallizing and separating to obtain a sodium bicarbonate crystal and adding in a raw material calcining stage for recycling; continuously crystallizing to form composite potassium and sodium salt which can be added with carbon components for circulation of the solution and also can be used as a calcining ingredient for recycling; and adding a proper amount of concentrated sulfuric acid or introducing SO3 gas into theresidual solution of potassium-rich solution to prepare suspension of potassium sulfate, wherein the suspension can be directly dried to prepare the qualified agricultural potassium sulfate product and also can be filtered and dried to prepare high-grade agricultural potassium sulfate product.
Description
technical field [0001] The invention relates to a method for preparing agricultural potassium sulfate by utilizing water-insoluble potassium-rich rock. Background technique [0002] my country is a large agricultural country, and the demand for non-chlorine-based potassium fertilizer potassium sulfate is large. Domestic production capacity of potassium sulfate is limited, and most of them rely on imports. The reason is that domestic water-soluble potassium ore resources are extremely scarce, and raw materials for the production of potassium sulfate are heavily dependent on imports. However, my country's non-water-soluble potassium mineral resources are rich and diverse, mainly including potassium feldspar, leucite, illite, potassium-rich shale, potassium-rich volcanic rock, nepheline syenite, pegmatite and potassium-rich slate, etc. . According to statistics, the total amount of non-water-soluble potassium ore resources in the country is at least about 20 billion tons. The...
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Inventor 马鸿文刘梅堂刘晓婷
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)