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A strontium slag and reaction technology, applied in the field of leaching residue recovery, can solve the problems of waste of resources, increase of production costs, etc., and achieve the effect of improving recovery rate and resource utilization
Inactive Publication Date: 2013-07-17
GUIZHOU REDSTAR DEVING
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[0002] Industrial strontium carbonate is generally produced by carbon reduction method. In this production process, a large amount of water leaching slag is produced after the calcined material is soaked in water. A large amount of strontium contained in these water leaching slag is discarded without being used. Increased production costs, but also caused a waste of resources
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Embodiment 1
[0051] Strontium-containing leaching residue 3.0Kg (water content 27.4%), measure all acid-soluble strontium (calculated as strontium chloride hexahydrate) to be 34.71%, add industrial hydrochloric acid to react to pH = 1 under stirring, add CaCO 3 Mineral powder (calcium carbonate content 85%) 170 grams, until utilize acid iodometric method to measure SO in real time in reaction 3 2- The concentration was 1.10g / L, and CaO was added to adjust the pH to 6, separated by suction filtration, the filter cake was rinsed with a small amount of deionized water, the filtrate was combined, and the filter residue was discarded.
[0052] Stir the above filtrate and add industrial hydrogen peroxide and strontium hydroxide, heat to boil, evaporate and concentrate, hot press filter, discard the filter residue, liquid phase cooling and crystallization, after drying, sample 1# is obtained, and the crystallization mother liquor is returned to add hydrogen peroxide and hydrogen The strontium ox...
Embodiment 2
[0054] Strontium-containing leaching residue 3.0Kg (moisture content 28.0%), measure all acid-soluble strontium (calculated as strontium chloride hexahydrate) to be 27.11%, add industrial hydrochloric acid to react to pH=2 under stirring, add CaCO 3 Mineral powder (calcium carbonate content 85%) 135 grams, until utilizing acid iodometric method to measure SO in real time in the reaction 3 2- The concentration is 0.83g / L, add CaO to adjust the pH value to 7, separate by suction filtration, rinse the filter cake with a small amount of deionized water, combine the filtrate, and then use CaO to adjust the pH value to 8. The filter cake can be used as a foundation For building materials, the washing water is returned to the acidification reaction for recycling.
[0055] Add industrial hydrogen peroxide and strontium hydroxide to the above filtrate under stirring, heat and boil, evaporate and concentrate, hot press filter, discard the filter residue, liquid phase cooling and crysta...
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Abstract
The invention relates to a method for recovering strontium slag. The method comprises the following main steps: (1) adding hydrochloric acid in the strontium slag under the condition of stirring until the pH value of a reaction system is stabilized between 1 and 2; (2) adding a calcium carbonate source substance in the reaction system obtained in the step (1) until the concentration of SO3<2-> isless than 2.0g / L; (3) regulating the pH value of the solution obtained in the step (2) to 6-7, carrying out solid-liquid separation, and washing a solid phase; and (4) decontaminating and treating mother liquor obtained in the step (3) so as to obtain a strontium chloride hexahydrate crystal product. By utilizing a double decomposition reaction of a calcium salt in a solution of strontium slag dissolved with hydrochloric acid; due to the different acid effects of sulfites of calcium and strontium under the condition of an acidic medium, the strontium salt product with relatively high value can be obtained through a replacement reaction, thereby solving the problem that strontium in strontium sulfite is difficult to recover, improving the recovery rate of the strontium salt and improving resource utilization rate.
Description
technical field [0001] The invention discloses a method for recovering strontium slag, in particular to a method for recovering leaching residue produced by carbon reduction to produce strontium carbonate. Background technique [0002] Industrial strontium carbonate is generally produced by carbon reduction method. In this production process, a large amount of water leaching slag is produced after the calcined material is treated by water leaching. The large amount of strontium contained in these water leaching slag is discarded without being used, which not only improves Increased production costs, but also caused a waste of resources. As the ore grade decreases year by year, the content of strontium-containing compounds in the residue increases significantly. The weight percentages of the components in the typical residue are as follows: [0003] [0004] Note: SrMO includes strontium carbonate, strontium silicate, strontium aluminate and a small amount of strontium fe...
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