Method for preparing magnesium hydroxide with magnesium sulfate solution
A technology of magnesium hydroxide and magnesium sulfate, applied in the direction of magnesium hydroxide, nickel oxide/nickel hydroxide, cobalt oxide/cobalt hydroxide, etc., can solve the problem of inability to separate calcium sulfate crystal magnesium hydroxide particles and high cost of separation of calcium and magnesium , separation coefficient decline and other problems, to achieve the effect of low price, large separation coefficient of calcium and magnesium, and low production cost
Inactive Publication Date: 2013-04-17
ZHEJIANG HUAYOU COBALT
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Problems solved by technology
[0003] The technical problem to be solved by the present invention is to overcome the defects of high calcium and magnesium separation cost and low efficiency in the above-mentioned existing hydrometallurgy, and provide a method for preparing magnesium hydroxide by separating calcium and magnesium with a drum sieve, and the separation coefficient of calcium and magnesium is relatively large And the separation cost is low
[0005] In the actual production process, calcium sulfate crystals are too fine to be separated from magnesium hydroxide particles or sieved together, resulting in a decrease in the separation coefficient
Method used
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[0016] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0017] like figure 2 The equipment connection diagram of the method of separating calcium and magnesium by drum sieve is shown. Two series-connected magnesium precipitation tanks (1#, 2#) are placed at different heights to maintain the height difference. The underscreen of the trommel screen is collected by the liquid receiving box and pumped to the filter press; the overscreen is transported out of the trommel screen by a screw conveyor and then pumped to the seed pickling tank. A small amount of clean water is used to continuously flush the inner surface of the screen mesh inside the drum screen.
[0018] like Figure 1-2 The process flow chart of the method of separating calcium and magnesium with a drum sieve is shown. Add an appropriate amount of lime milk into the 1# sinking magnesium tank 6, start stirring, heat up to (50-80) ° C, kee...
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The invention relates to a method for preparing magnesium hydroxide with magnesium sulfate solution. At present, a solid-solid separating device can effectively separate magnesium hydroxide from calcium sulfate for preparation of magnesium hydroxide; and however, the device is smaller in disposing amount, and the parameters are difficult to control. The method is characterized in that a proper amount of lime cream is added in magnesium sulfate solution, so that generated calcium sulfate can be formed into crystal grains; then, magnesium sulfate solution and lime cream are pumped into a magnesium precipitation device for magnesium precipitation, so that newly-generated calcium sulfate grows on the calcium sulfate seed crystal which is prepared previously, and larger grain diameter difference is formed between the calcium sulfate and the magnesium hydroxide; and after magnesium precipitation is finished, a trommel screen is used for screening, so that the purpose of separating calcium and magnesium can be achieved. The method has the advantages that the operation is simple, the calcium-magnesium separation coefficient is larger, the energy consumption is lower, and the method is more economical.
Description
technical field [0001] The invention relates to a method for directly separating two kinds of solid particles with large difference in particle size by using a drum sieve, in particular to a method for preparing magnesium hydroxide from a magnesium sulfate solution. Background technique [0002] The method for industrially preparing magnesium hydroxide is commonly used caustic soda as a precipitating agent, adding excessive caustic soda to completely precipitate magnesium ions, and then filtering, washing and drying to obtain the product. This method has high production costs and is uneconomical. The latest technology at present is to use milk of lime as a precipitant, but the problem encountered is how to separate the two solids of magnesium hydroxide and calcium sulfate generated. Chinese Patent No. 201010160193.9 discloses a "solid-solid separation device", which can Effectively separate magnesium hydroxide and calcium sulfate for the preparation of magnesium hydroxide; h...
Claims
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Patent Timeline
Login to View More IPC IPC(8): C01F5/22C01G51/04C01G53/04C01G3/02
Inventor 沈建中孙灿沈忠杰徐中方朱继俊
Owner ZHEJIANG HUAYOU COBALT