CN1346802A - Process for preparing barium chloride by chlorating and calcining carbonate-type barium ore - Google Patents
Process for preparing barium chloride by chlorating and calcining carbonate-type barium ore Download PDFInfo
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- CN1346802A CN1346802A CN 01128989 CN01128989A CN1346802A CN 1346802 A CN1346802 A CN 1346802A CN 01128989 CN01128989 CN 01128989 CN 01128989 A CN01128989 A CN 01128989A CN 1346802 A CN1346802 A CN 1346802A
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- barium
- carbonate
- barium chloride
- chloride
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Abstract
A process for preparing barium chloride from carbonate type barium ore includes calcining said barium ore along with calcium (or magnesium) chloride at 500-1500 deg.c to obtain melt of barium chloride and calcium (or magnesium) carbonate, immersing to obtain solution of barium chloride and dregs, solid-liquid separation, concentrating the solution of barium chloride, crystallizing, centrifugation and drying. Its advantages are high yield and purify of product, simple process, low cost and basically no discharge of waste liquid.
Description
The invention relates to a method for preparing barium chloride, in particular to a method for preparing barium chloride by chloridizing and roasting carbonate type barium ore.
The existing method for preparing barium chloride by using carbonate barium ore is generally a hydrochloric acid method, namely, the carbonate barium ore reacts with hydrochloric acid to generate barium chloride, and the reaction equation is as follows:
in the ore deposit of large carbonate barium ore found in Chongqing and Sichuan, because the carbonate barium ore is mixed with a large amount of calcium carbonate, magnesium carbonate and other impurities, the following side reactions are bound to occur in the process of preparing barium chloride by a hydrochloric acid method:
in the above reaction formula, x represents other divalent cations. The reactions consume a large amount of hydrochloric acid, the effective utilization rate of chlorine radicals is low, the production cost is increased, the hydrochloric acid is easy to volatilize, a large amount of waste liquid is discharged, the environment is seriously polluted, the process flow for preparing the barium chloride by using the hydrochloric acid method is long, moreover, the hydrochloric acid resource is not available in a mining area, and the corrosivity of the hydrochloric acid is strong, so that the difficulty of the remote transportation and storage of the hydrochloric acid is caused, and the manufacturing cost is further increased. At present, the cost of producing one ton of barium chloride is about 1450 yuan.
The invention aims to provide a method for preparing barium chloride by chloridizing and roasting carbonate type barium ores, which has simple preparation method, obviously reduces the production cost and avoids polluting the environment.
The invention is realized by the technical proposal that carbonate barium ore and calcium chloride or magnesium chloride are chloridized and roasted at the temperature of 500-1500 ℃ to generate barium chloride and calcium carbonate or magnesium carbonate melt, the barium chloride solution and solid-phase slag mainly containing calcium carbonate or magnesium carbonate are formed by leaching slag, and then the barium chloride solution is concentrated, crystallized, centrifuged and dried to prepare the barium chloride product. The main reaction equation is as follows:
or
In the reaction formula of the invention, calcium carbonate and magnesium carbonate which are mixed in carbonate type barium ore can not react with calcium chloride or magnesium chloride, so that the effective utilization of chlorine radicals is high, unnecessary waste can not be caused, the production cost is reduced, and the calcium chloride or the magnesium chloride which is used as a raw material for preparing barium chloride is solid, thereby bringing great convenience to remote transportation and simultaneously remarkably reducing the transportation cost.
By adopting the technical scheme, the invention has the advantage that the calcium chloride/magnesium chloride composite material is prepared by using cheap industrial calcium chloride or magnesium chloride and performing chlorination roasting and leaching in one step. The main impurities of calcium carbonate, silicon dioxide, carbon and the like in the carbonate barium ore do not influence the yield of barium chloride, the effective utilization rate of chlorine radicals is high, the prepared barium chloride product has low impurity content and lowcost, the cost for producing one ton of barium chloride is 1100 yuan, the process flow is simple, waste liquid discharge is basically avoided, the leaching residue mainly comprises calcium carbonate or magnesium carbonate, the calcium carbonate or magnesium carbonate can be used as a cement raw material, and the calcium carbonate or magnesium carbonate can be directly discarded to avoid environmental pollution.
The following is a comparison table of barium chloride produced by the invention and barium chloride which is a superior product of national standard (GB 1617-89):
| index name | Superior products (national standard) | Barium chloride produced by the invention |
| Barium chloride | The content is more than or equal to 99.0 percent | 99.5 |
| Calcium carbonate | The content is less than or equal to 0.036 | 0.027 |
| Sodium salt | The content is less than or equal to 0.20 | —— |
| Sulfide compound | The content is less than or equal to 0.003 | 0.0008 |
| Iron | The content is less than or equal to 0.001 | 0.0002 |
| Water insoluble substance | The content is less than or equal to 0.05 | 0.01 |
The drawings of the invention are illustrated as follows:
FIG. 1 is a schematic process flow diagram of the present invention;
in the figure: 1. a crusher; 2. a pulverizer; 3. a mixer; 4. rotary kilns or tunnel kilns; 5. a leacher; 6. a filter; 7. a neutralization pond; 8. a filter; 9. an evaporator; 10. a crystallization tank; 11. a centrifuge; 12. and (7) a dryer.
The invention is further illustrated by the following examples:
the invention chloridizes and roasts carbonate barium ore and calcium chloride or magnesium chloride at 500-1500 deg.C to produce barium chloride and calcium carbonate or magnesium carbonate melt, forms barium chloride solution and solid-phase slag mainly containing calcium carbonate or magnesium carbonate through leaching slag, then makes solid-liquid separation, and makes the barium chloride solution undergo the processes of concentration, crystallization, centrifugation and drying so as to obtain the barium chloride product.
As can be seen from the combination of FIG. 1, the present invention is mainly carried out in the following steps:
a. putting carbonate barium ore into a crusher 1 for crushing, and crushing the barium ore into 60-120 meshes by a crusher 2 generally;
b. uniformly stirring and mixing the crushed carbonate barium ore and calcium chloride or magnesium chloride fine powder in a mixer (3) according to the weight ratio of 1: 0.3-0.8 of pure substances;
c. feeding the uniformly mixed mixture into a tunnel kiln or a rotary furnace 4, roasting at the temperature of 500-1500 ℃, wherein the roasting time is 4 hours generally, and fully reacting the mixture to generate a barium chloride and calcium carbonate or magnesium carbonate melt;
d. discharging the barium chloride and calcium carbonate or magnesium carbonate melt out of the furnace, cooling the barium chloride and calcium carbonate or magnesium carbonate melt slightly, feeding the barium chloride and calcium carbonate or magnesium carbonate melt into a leacher 5, adding clear water, stirring and leaching, wherein the leaching time is generally 30 minutes, after the leaching is finished, carrying out solid-liquid separation through a filter 6, feeding liquid barium chloride mother liquor into a neutralization tank 7, and discarding leaching residues;
e. introducing carbon dioxide gas into the barium chloride mother liquor inthe neutralization tank 7 to reduce the pH value of the barium chloride mother liquor from 12 to 7-8;
f. filtering a small amount of carbonate precipitate from the barium chloride mother liquor with the pH value reduced by a filter 8, feeding the filtered and clarified barium chloride mother liquor into an evaporator 9 for concentration, crystallizing in the evaporator 9 or a crystallizing pond 10, centrifuging, washing crystals and filtering by a centrifuge 11, and drying by a dryer 12 to finally prepare a barium chloride product.
In the above steps, the optimum temperature for the barium chloride and calcium carbonate or magnesium carbonate melt generated by the roasting reaction is 750 ℃.
In order to fully leach the barium chloride, the number of times of stirring and leaching the barium chloride mother liquor is multiple, and the saturated barium chloride mother liquor leached for the first time directly enters the following steps to prepare the barium chloride; the unsaturated barium chloride liquor obtained by the subsequent leaching is used as the mother liquor for the next primary leaching of high-concentration saturated barium chloride.
Claims (4)
1. A process for preparing barium chloride from carbonate-type barium ore includes such steps as chlorinating and calcining carbonate-type barium ore with calcium chloride or magnesium chloride at 500-1500 deg.C to obtain molten barium chloride and calcium carbonate or magnesium carbonate, immersing to obtain solution of barium chloride and solid-phase dregs containing calcium carbonate or magnesium carbonate, solid-liquid separation, concentrating, crystallizing, centrifugal separation and drying.
2. The method for preparing barium chloride by chloridizing and roasting carbonate type barium ore according to claim 1, which is sequentially carried out according to the following steps:
a. putting carbonate barium ore into a crusher (1) for crushing, and then crushing the carbonate barium ore by a crusher (2);
b. uniformly stirring and mixing the crushed carbonate barium ore and calcium chloride or magnesium chloride fine powder in a mixer (3) according to the weight ratio of 1: 0.3-0.8 of pure substances;
c. feeding the uniformly mixed mixture into a tunnel kiln or a rotary furnace (4), and roasting at the temperature of 500-1500 ℃ to ensure that the mixture fully reacts to generate barium chloride and calcium carbonate or magnesium carbonate melt;
d. discharging barium chloride and calcium carbonate or magnesium carbonate melt out of the furnace, cooling the barium chloride and calcium carbonate or magnesium carbonate melt slightly, feeding the barium chloride and calcium carbonate or magnesium carbonate melt into a leacher (5), adding clear water, stirring and leaching, performing solid-liquid separation through a filter (6) after leaching is finished, feeding liquid barium chloride mother liquor into a neutralization tank (7), and discarding leaching residues;
e. introducing carbon dioxide gas into the barium chloride mother liquor in the neutralization tank (7) to reduce the pH value of the barium chloride mother liquor from 12 to 7-8;
f. filtering a small amount of carbonate precipitate from the barium chloride mother liquor with the reduced pH value through a filter (8), feeding the filtered and clarified barium chloride mother liquor into an evaporator (9) for concentration, crystallizing in the evaporator (9) or a crystallizing pond (10), centrifuging, washing crystals and filtering through a centrifuge (11), and drying througha dryer (12) to finally prepare a barium chloride product.
3. The process for preparing barium chloride by chloridizing and calcining carbonate-type barium ore as claimed in claim 2, wherein the temperature of the melt of barium chloride and calcium carbonate or magnesium carbonate generated by calcining reaction is 750 ℃.
4. The method for preparing barium chloride by chloridizing and roasting carbonate type barium ore as claimed in claim 2, wherein the number of times of stirring and leaching the mother liquor of barium chloride is multiple, and the saturated mother liquor of barium chloride leached at the first time is directly fed into the following steps to prepare barium chloride; the unsaturated barium chloride liquor obtained by the subsequent leaching is used as the mother liquor for the next primary leaching of high-concentration saturated barium chloride.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011289899A CN1178860C (en) | 2001-10-23 | 2001-10-23 | Process for preparing barium chloride by chlorating and calcining carbonate-type barium ore |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011289899A CN1178860C (en) | 2001-10-23 | 2001-10-23 | Process for preparing barium chloride by chlorating and calcining carbonate-type barium ore |
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| CN1346802A true CN1346802A (en) | 2002-05-01 |
| CN1178860C CN1178860C (en) | 2004-12-08 |
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| CNB011289899A Expired - Fee Related CN1178860C (en) | 2001-10-23 | 2001-10-23 | Process for preparing barium chloride by chlorating and calcining carbonate-type barium ore |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105621372A (en) * | 2016-03-29 | 2016-06-01 | 石家庄市正定金石化工有限公司 | Improved coarse-strontium leaching device and process |
| CN113800549A (en) * | 2020-06-17 | 2021-12-17 | 南风化工集团股份有限公司 | Method for extracting barium chloride from precipitated barium sulfate waste residue |
| CN114907115A (en) * | 2022-06-14 | 2022-08-16 | 生态环境部华南环境科学研究所(生态环境部生态环境应急研究所) | Device and method for preparing production materials of ceramic factory by recycling barium resources |
-
2001
- 2001-10-23 CN CNB011289899A patent/CN1178860C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105621372A (en) * | 2016-03-29 | 2016-06-01 | 石家庄市正定金石化工有限公司 | Improved coarse-strontium leaching device and process |
| CN113800549A (en) * | 2020-06-17 | 2021-12-17 | 南风化工集团股份有限公司 | Method for extracting barium chloride from precipitated barium sulfate waste residue |
| CN114907115A (en) * | 2022-06-14 | 2022-08-16 | 生态环境部华南环境科学研究所(生态环境部生态环境应急研究所) | Device and method for preparing production materials of ceramic factory by recycling barium resources |
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|---|---|
| CN1178860C (en) | 2004-12-08 |
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