A kind of production method of granular anhydrous strontium chloride for automobile tail gas treatment
A technology of automobile exhaust gas and production method, applied in chemical instruments and methods, separation methods, calcium/strontium/barium chloride and other directions, can solve problems such as environmental pollution, waste of resources, etc., and achieve excellent ammonia absorption efficiency, easy storage, and low cost. The effect of production costs
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Embodiment 1
[0033] Embodiment 1: determine Ca in the strontium chloride solution 2+ 、Ba 2+ Content
[0034] In the anhydrous strontium chloride produced by the reaction of slag mixture and hydrochloric acid, there are often a large amount of calcium chloride and barium chloride, which may affect the effect of fixing ammonia: calcium chloride is easy to absorb moisture. If the content is too high, the product will It is easy to agglomerate, which affects storage time and recycling; at the same time, the density of calcium chloride and strontium chloride is smaller than that of anhydrous strontium chloride, which occupies a large space. If the content is too high, it will cause insufficient material filling space in solid ammonia equipment , affecting the release of ammonia. However, such impurities also have the effect of fixing ammonia. More importantly, if all such impurities are removed, the production cost will be very high. Therefore, it is very important to determine the appropria...
Embodiment 2
[0056] Embodiment 2: determine the packing of anhydrous strontium chloride
[0057] 1. Strontium carbonate ore (42% of strontium carbonate, 21% of strontium sulfate, 24% of calcium carbonate, 5% of barium carbonate, 8% of impurities such as iron, magnesium and other mixed metal salts, earth) and mass concentration are 31% hydrochloric acid React to obtain a strontium chloride solution with a concentration of 32 degrees Baume.
[0058] 2. After testing, the Ca in the strontium chloride solution 2+ The content is 28.5g / L, Ba 2+ The content is 6.5g / L. Slowly add 96% strontium hydroxide in the solution, the addition amount is to add 25kg per cubic solution; after reducing the calcium, measure the Ca in the solution 2+ =23.5g / L.
[0059] 3. Dilute the above strontium chloride solution by 2kg / m 3 Add hydrogen peroxide with a mass concentration of 27% to remove impurities, remove iron ions, sulfate ions, sediment and other foreign matters; then filter to obtain strontium chlorid...
Embodiment 3
[0071] Embodiment 3: Determining the preparation process and optimal particle size of anhydrous strontium chloride
[0072] 1, waste strontium carbonate (50% of strontium carbonate, 10% of calcium carbonate, 25% of aluminum oxide, 4.5% of barium carbonate, 10.5% of impurities such as iron, magnesium and other mixed metal salts, earth) and 31% hydrochloric acid are reacted to obtain A solution of strontium chloride with a concentration of 35 degrees Baume.
[0073] 2. After testing, the Ca in the strontium chloride solution 2+ The content is 20.1g / L, Ba 2+ The content is 7.5g / L. Slowly add 5% concentration of sulfuric acid, the addition amount is 15kg per cubic solution, after reducing the barium, the barium content in the solution is 4.5g / L.
[0074] 3. Put the strontium chloride solution at 2kg / m 3 Add 27% concentration of hydrogen peroxide to remove impurities, remove iron ions, sulfate ions, sediment and other foreign matters; filter to obtain strontium chloride clear l...
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