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Method for preparing strontium carbonate

A technology of strontium carbonate and strontium sulfate, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problem of high content of barium sulfate, and achieve the effect of simple process and low cost

Inactive Publication Date: 2004-09-29
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But for the higher celestite ore with impurity barium content, the barium sulfate content of the above-mentioned concentrate that this method obtains is still higher

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Example 1: Get 100 grams of lapis lazuli crushed to 150 mesh (the content of strontium sulfate is 86%) and disperse it in 300 milliliters of water to make slurry, add 12 grams of sodium sulfate and 52 grams of sodium carbonate, heat to 90 ° C and stir for 3 hours, filter ,washing. Disperse the filter residue in 150 ml of water, add 98 g of concentrated hydrochloric acid to acidify for 2 hours, filter, add 5 ml of 18-20% ammonia water to the filtrate, heat to 60°C and stir for 30 minutes, filter to remove the precipitate, and take 51 g of carbonic acid Sodium was gradually added to the filtrate, stirred for 1 hour, filtered, washed with water, and dried to obtain a white strontium carbonate product with a barium carbonate content of 1.5%.

Embodiment 2

[0013] Embodiment 2: Get 100 grams of lapis lazuli crushed to 100 mesh (strontium sulfate content is 90%) and disperse in 150 milliliters of water, add 10 grams of ammonium sulfate, stir and make slurry; Get 42 grams of ammonium bicarbonate, 45 grams of 18~20 % concentrated ammonia water was made into 150 ml aqueous solution, added to the celestite slurry, heated to 60° C., stirred and reacted for 5 hours, filtered and washed. Disperse the filter residue in 100 ml of water, add 66 g of 65% nitric acid to acidify for 2 hours, filter, add 5 ml of 18-20% ammonia water to the filtrate, heat to 80°C and stir for 30 minutes, filter to remove the precipitate, and simultaneously take 38 gram of ammonium bicarbonate, add 20 milliliters of 18-20% ammonia water to make 100 milliliters of solution, gradually add in the filtrate, stir for 1 hour, filter, wash with water, dry, obtain white strontium carbonate product, barium carbonate content 1.2%.

Embodiment 3

[0014] Embodiment 3: Get 100 grams of lapis lazuli crushed to 50 mesh (strontium sulfate content is 82%) and disperse in 150 milliliters of water, add 9 grams of ammonium sulfate, stir and make slurry; Get 38 grams of ammonium bicarbonate, 40 grams of 18~20 % concentrated ammonia water was made into 150 ml aqueous solution, added to the celestite slurry, heated to 60° C., stirred and reacted for 5 hours, filtered and washed. Disperse the filter residue in 200 ml of water, add 76 g of ammonium nitrate and heat to 95°C for acidification for 4 hours, filter, add 5 ml of 18-20% ammonia water to the filtrate, heat to 70°C and stir for 30 minutes, filter to remove the precipitate, and at the same time Take 35 grams of ammonium bicarbonate, add 20 milliliters of 18-20% ammonia water to form 100 milliliters of solution, gradually add to the filtrate, stir for 1 hour, filter, wash with water, and dry to obtain a white strontium carbonate product with a barium carbonate content of 1.7 %...

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Abstract

The preparation method of strontium carbonate includes the following steps: pulverizing celestine in which the strontium carbonate content is 30-95%, making it react with soluble carbonate to obtain crude strontium carbonate, adding barium-removing agent to inhibit the conversion of barium sulfate into barium carbonate, then making the crude strontium carbonate react with acidifying reagent to obtain soluble strontium salt solution, removing impurity and making the strontium salt solution react with carbonization reagent to obtain the invented strontium carbonate.

Description

technical field [0001] The invention relates to a method for preparing strontium carbonate, in particular to a method for preparing strontium carbonate from celestite by removing barium in one step. Background technique [0002] Strontium carbonate is an important chemical raw material, which is widely used in many fields such as electronics industry, magnetic materials, ceramic glazes and special glasses. Strontium carbonate is prepared from celestite (mainly strontium sulfate) by carbon reduction or double decomposition. The carbon reduction method is gradually being phased out due to the large amount of harmful hydrogen sulfide gas produced during the production process. The metathesis method is a method for preparing strontium carbonate through metathesis reaction of celestite and soluble carbonate, which has low pollution and stable product quality, and will be the main method for producing strontium carbonate in the future. But if the content of impurity barium in th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/18
Inventor 方鹏飞汪成
Owner WUHAN UNIV
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