Preparation method for barium carbonate

Abstract

A disclosed preparation method for barium carbonate comprises: at room temperature, dissolving barium hydroxide in a reaction vessel I with high-purity water under stirring, also at a certain temperature, adding a dispersant into the barium hydroxide solution, stirring at a constant temperature, heating ammonium carbonate in a reaction vessel II, introducing generated CO2 and NH3 into the reaction vessel I, reacting with stirring with a stirrer at a certain temperature, and performing filtering, leaching and roasting on the material finishing the reaction so as to obtain barium carbonate. According to the preparation method, by employing barium hydroxide and ammonium carbonate as the raw materials and employing a gas-liquid reaction, the reaction product is single; also, by adding the dispersant before the reaction starts and performing roasting at different periods and different temperatures, the agglomeration problem of precipitation is solved, the digestion time of precipitation is fully shortened and the purity of the product is guaranteed.

Description

technical field

[0001] The invention relates to the technical field of design materials, in particular to a method for preparing barium carbonate. Background technique

[0002] At present, the production methods of barium carbonate mainly include: carbonization method, double decomposition method and witherite method. Among them: the carbonization method has the advantages of simple production process and low cost, but its product has a high sulfur content; the main raw material of the double decomposition method is barium chloride, and the product cost is slightly higher, but the obtained product has a very low sulfur content and high purity; The witherite method has the characteristics of low investment, full utilization of raw materials, no pollution, and easy control of process conditions. However, it is difficult to remove impurities in the production process of this method, and the product purity is generally low. Comparing the three methods, the metathesis method can...

Examples

Embodiment 1

[0013] Embodiment 1: at room temperature, with 1000g high-purity water, 100g barium hydroxide is stirred and dissolved in the reaction kettle I, is mixed with barium hydroxide solution, then at 50 ℃, 10g dispersant sodium pyrophosphate is added barium hydroxide solution, And stir at constant temperature for 60min, then heat the ammonium carbonate in the reaction kettle II at 150°C, and the generated gas CO 2 and NH 3 Pass it into the reaction kettle I at a flow rate of 50 mL / min through the air duct, and stir and react at a speed of 80 rpm at 50°C for 3 hours; filter the completed reaction material, and rinse the filtered solid with high-purity water for 8 Each time, 20 minutes each time; put the rinsed solid into a roasting furnace and roast at 250°C for 90 minutes, and roast at 600°C for 60 minutes to obtain barium carbonate.

Embodiment 2

[0014] Example 2: At room temperature, 200g of barium hydroxide was stirred and dissolved in the reactor I with 2000g of high-purity water to prepare a barium hydroxide solution, and then at 80°C, 20g of the dispersing agent sodium hexametaphosphate was added to the hydroxide Barium solution, and stirred at constant temperature for 60min, then heated the ammonium carbonate in the reaction kettle II at 200°C, and the generated gas CO 2 and NH 3 Pass it into the reaction kettle I at a flow rate of 100 mL / min through the air duct, and stir and react at a speed of 50 rpm at 60 °C for 5 hours; filter the completed reaction material, and rinse the filtered solid with high-purity water for 10 Each time, 20 minutes each time; put the rinsed solid into a roasting furnace and roast at 250°C for 90 minutes, and roast at 600°C for 60 minutes to obtain barium carbonate.

technical field

[0001] The invention relates to the technical field of design materials, in particular to a method for preparing barium carbonate. Background technique

[0002] At present, the production methods of barium carbonate mainly include: carbonization method, double decomposition method and witherite method. Among them: the carbonization method has the advantages of simple production process and low cost, but its product has a high sulfur content; the main raw material of the double decomposition method is barium chloride, and the product cost is slightly higher, but the obtained product has a very low sulfur content and high purity; The witherite method has the characteristics of low investment, full utilization of raw materials, no pollution, and easy control of process conditions. However, it is difficult to remove impurities in the production process of this method, and the product purity is generally low. Comparing the three methods, the metathesis method can...

Examples

Embodiment 1

[0013] Embodiment 1: at room temperature, with 1000g high-purity water, 100g barium hydroxide is stirred and dissolved in the reaction kettle I, is mixed with barium hydroxide solution, then at 50 ℃, 10g dispersant sodium pyrophosphate is added barium hydroxide solution, And stir at constant temperature for 60min, then heat the ammonium carbonate in the reaction kettle II at 150°C, and the generated gas CO 2 and NH 3 Pass it into the reaction kettle I at a flow rate of 50 mL / min through the air duct, and stir and react at a speed of 80 rpm at 50°C for 3 hours; filter the completed reaction material, and rinse the filtered solid with high-purity water for 8 Each time, 20 minutes each time; put the rinsed solid into a roasting furnace and roast at 250°C for 90 minutes, and roast at 600°C for 60 minutes to obtain barium carbonate.

Embodiment 2

[0014] Example 2: At room temperature, 200g of barium hydroxide was stirred and dissolved in the reactor I with 2000g of high-purity water to prepare a barium hydroxide solution, and then at 80°C, 20g of the dispersing agent sodium hexametaphosphate was added to the hydroxide Barium solution, and stirred at constant temperature for 60min, then heated the ammonium carbonate in the reaction kettle II at 200°C, and the generated gas CO 2 and NH 3 Pass it into the reaction kettle I at a flow rate of 100 mL / min through the air duct, and stir and react at a speed of 50 rpm at 60 °C for 5 hours; filter the completed reaction material, and rinse the filtered solid with high-purity water for 10 Each time, 20 minutes each time; put the rinsed solid into a roasting furnace and roast at 250°C for 90 minutes, and roast at 600°C for 60 minutes to obtain barium carbonate.