Experimental study on the new process of preparing potassium sulfate
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The production process of preparing potassium sulfate is the reaction process of carnallite, thenardite and water. The above raw materials follow the relationship of Na+, K+, Mg2+//Cl-, SO42-, -H2O five-element system, through cold decomposition and heat. The dissolved and cold crystallization process is skillfully prepared to obtain a certain proportion of soft potassium magnesium strontium and potassium chloride mixed salt. The mixed salt and water follow the K+, Mg2+, Cl-, SO42--H2O quaternary interaction system law, prepared by transformation process. A good quality potassium sulfate product. The research content of this subject is mainly to use the carnallite produced in Qinghai Salt Lake as raw material to manufacture potassium sulphate as a raw material, and carry out engineering research on the process and device of “halogenite and thenardite conversion method†to solve the process control after test amplification. , smooth operation and equipment problems such as separation of solid and liquid materials, cooling and crystallization. The process flow is short and reasonable, and the production cost is moderate.
The main technical and economic indicators:
The product quality has reached the standard of agricultural potassium sulphate grade (HG/T3279-1990).
Potassium oxide content ≥ 50%, chloride root ≤ 1.5%.
Product yield: potassium ≥ 70%, sulfate ≥ 70%.
Production cost: 1400-1600 yuan / ton.
This technology has passed the scientific and technological research report of Lanzhou Enquiry Center of Chinese Academy of Sciences. It shows that “the process of producing potassium sulfate by using crude potassium salt, salt field carnallite and natural anhydrous thenardite as raw materials†will be raw material crude potassium salt (including KCl40-80%) and Yantian. The carnallite and the natural anhydrous thenardite are mixed in a certain ratio according to potassium, magnesium, sulfate and water, dissolved by heating, separated by water and separated by insoluble solid sodium chloride, and crystallized to obtain a certain proportion of soft potassium magnesium. A mixture of cerium and potassium chloride is then converted and separated by water to obtain potassium sulfate. The process has not been reported in the same literature at home and abroad. The technology won the second prize of Science and Technology Progress Award of the Chinese Academy of Sciences (intermediate test of 150 tons/year potassium sulfate) and the third prize of scientific and technological progress of Qinghai Province (annual production of 10,000 tons of potassium sulfate industrial test).
Potassium sulphate is an important and currently used high quality non-chlorine potassium fertilizer. With the increasing demand for potassium sulfate in China, the potash market has broad prospects. Qinghai's proven reserves of potassium resources reached 381 million tons in KCl, accounting for 6.685 billion tons of proven potassium reserves in the country, and the burial is shallow, the grade is high, and mining is easy. Therefore, the use of Qinghai salt lake potassium resources and thenardite resources production Potassium sulphate has the advantage that cannot be compared in other places, and it is also one of the reliable ways to solve the self-sufficiency of potassium sulphate products in China.
The process carried out an intermediate test of 150 tons/year of potassium sulphate, and went through the operation of two 10,000 tons of potassium sulphate industrial test plant. The key equipment was evaluated and the process achieved breakthrough. The cheap raw materials of Salt Lake and the new technology were used. Obtain high-quality high-quality potassium sulphate, and solve the solid-liquid separation technology of salt lake slurry in the production of salt lake enterprises that has been confused for many years and the cooling crystallization technology required by this process, which provides for the construction of 100,000 tons of potassium sulphate plant. Design basis, providing a complete set of production technology for China's potassium sulfate industry.
The production cost of the production unit of 10,000 tons of potassium sulphate production plant is 1533.4 yuan / ton, and the operating cost is 1395.4 yuan / ton. Economic benefits: pre-tax profit of 4.666 million yuan; after-tax profit of 2.995 million yuan; investment recovery period of 6.8rh; breakeven point BEP53.4%.