Carnalite dehydration process and apparatus

Abstract

The invention discloses a process for carnallitite dehydration and device. Said device comprises charging bucket, spiral material feed, charge hopper, dewatering oven, draft fan, gas cleaning tower, cooling tank, circulating cooling pool, charging hole and furnace chamber. The charging bucket is connected with charge hopper through spiral material feed, charge hopper is connected with dewatering oven, the part of gas funnel out of furnace chamber is installed with draft fan, the draft fan is connected to gas cleaning tower; the dewatering oven is connected with cooling tank, the outside of cooling tank is the circulating cooling pool. Said process comprises: feeding carnallitite containing water into charge hopper from charging bucket, then going into the first and second dewatering oven, the dewatered melted carnallitite then inflowing into cooling tank, the circulating cooling water cooling carnallitite into solid phase, feeding waterless carnallitite into charging hole through spiral material feed for packing. The invention is characterized by continuous-running and automatic process, environment friendly and good dehydration effect.

Description

technical field [0001] The invention relates to a dehydration process and equipment, in particular to a continuous operation carnallite dehydration process and equipment. Background technique [0002] Carnallite is a naturally occurring compound with the molecular formula KCL.MgCL 2 .6H 2 O, is an important material for the production of magnesium metal and smelting aids. [0003] Because carnallite is formed in nature, the surface contains attached water, the interior contains 6 crystal waters, and contains some impurities, which brings difficulties to the electrolysis of magnesium metal and smelting, and at the same time increases transportation costs. For this reason, people have been using it for several years. To seek dehydration and removal of impurities, the fixed bed production process and boiling dehydration process are commonly used in the market, but both have their own disadvantages. [0004] The fixed bed is an indigenous process without molding equipment. Th...

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Problems solved by technology

[0005] Because water is attached to the surface of the compound, and the molecule contains crystal water, the fixed bed will be hydrolyzed during heating to produce HCL and CL 2 , leading to environmental pollution, and artificial stirring at the same time, it is not easy to remove all the crystal water and impurities in carnallite, and it is easy to generate secondary crystal water during the cooling process, which can remove up to 80% of water

[0006] Boiling heating and dehydration is to mix carnallite and fuel into the heating furnace. Although this combustion heating method has a high heat utilization rate, the molten carnallite is stirred by the power of the air distribution, so that the stirring is uneven, and the fuel and raw materials are mixed at the same time. Heating contact, because the oxygen in the combustion-supporting air will cause the oxidation of magnesium to generate magnesium oxide, and the impurities in the raw materials cannot be discharged, making the production cost and quality impure

[0007] The fuel used for boiling heating and dehydration can only be gas, which increases production costs, and poor control of the gas volume in the furnace during operation will cause the furnace to explode, which increases safety hazards

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