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A kind of decomposition method of carbonate ore

A technology of carbonate ore and ammonium salt solution, which is applied in the direction of carbonate preparation, ammonia preparation/separation, calcium/strontium/barium oxide/hydroxide, etc., which can solve the problem of increasing equipment and energy consumption, and ammonia concentration Low-level problems, to achieve the effect of reducing energy consumption, simplifying the process flow, and simple equipment

Active Publication Date: 2017-05-31
LONGYAN ZIYUN CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low concentration of ammonia water obtained by this method, it cannot be directly used for carbonization, so it needs to be reprocessed, increasing equipment and energy consumption

Method used

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  • A kind of decomposition method of carbonate ore
  • A kind of decomposition method of carbonate ore
  • A kind of decomposition method of carbonate ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] (1) Fill 125kg of limestone with a particle size of 20mm into the reaction tower, and the filling height is 25m.

[0064] (2) the mass concentration is 20% NH 4 The Cl solution is evenly sprayed on the limestone from the inlet of the ammonium salt solution at the top of the tower, and the temperature at the bottom of the tower is controlled at 240°C by the reboiler in the tower kettle, and the NH 4 The flow rate of the Cl solution makes the NH 4 The conversion of the Cl solution was 70%. CO 2 , NH 3 、H 2 The mixed gas of O is extracted from the mixed gas outlet at the top of the tower, and the ammonia concentration is 33wt%. After cooling, the ammonium bicarbonate solution is obtained for subsequent reactions, and the gas output at the top of the reaction tower is adjusted to make the top pressure 4.5MPa. CaCl 2 and unreacted NH 4 The Cl solution is extracted from the outlet of the bottom kettle liquid, and when the limestone has reacted by 35%, new limestone is ...

Embodiment 2

[0068] (1) Fill 50kg of dolomite with a particle size of 10mm into the reaction tower, and the filling height is 15m.

[0069] (2) the mass concentration is 15% (NH 4 ) 2 SO 4 The solution is evenly sprayed on the dolomite from the ammonium salt solution inlet at the top of the tower, and the temperature at the bottom of the tower is controlled to be 200° C. by the reboiler, and the (NH 4 ) 2 SO 4 The flow rate of the solution makes (NH 4 ) 2 SO 4 The solution conversion was 83%. CO 2 , NH 3 、H 2 The mixed gas of O is extracted from the mixed gas outlet at the top of the tower, and the ammonia concentration is 25wt%. After cooling, the ammonium bicarbonate solution is obtained for subsequent reactions, and the gas output at the top of the reaction tower is adjusted to make the top pressure 1.5MPa. MgSO 4 and unreacted (NH 4 ) 2 SO 4 The solution is taken out from the liquid outlet of the tower bottom kettle, and when the dolomite has reacted by 80%, a new dolomi...

Embodiment 3

[0073] (1) Fill 30kg of magnesite with a particle size of 5mm into the reaction tower, and the filling height is 6m.

[0074] (2) the mass concentration is 25% (NH 4 ) 2 SO 4 The solution is evenly sprayed on the magnesite from the inlet of the ammonium salt solution at the top of the tower, and the temperature at the bottom of the tower is controlled to be 160°C by the reboiler, and the (NH 4 ) 2 SO 4 The flow rate of the solution makes (NH 4 ) 2 SO 4 The conversion of the solution was 88%. CO 2 , NH 3 、H 2 The mixed gas of O is extracted from the mixed gas outlet at the top of the tower, and the ammonia concentration is 12wt%. After cooling, the ammonium bicarbonate solution is obtained for subsequent reactions, and the gas output at the top of the reaction tower is adjusted so that the top pressure is 0.6MPa. MgSO 4 and unreacted (NH 4 ) 2 SO 4 The solution is extracted from the outlet of the bottom kettle liquid, and when the magnesite reacts by 50%, new mag...

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Abstract

The invention relates to a decomposition method of carbonatite. The decomposition method comprises the following steps: (1) filling carbonatite into a reaction tower; and (2) introducing an ammonium salt solution with mass concentration of 10wt% to a saturated rate from an overhead ammonium salt solution feeding hole of the reaction tower, uniformly spraying on the carbonatite, controlling an overhead pressure of the reaction tower to be 0.5 to 5 MPa, and bottom tower temperature to be 150 to 250 DEG C, adjusting a flow rate of the ammonium salt solution, so that a conversion rate of the ammonium salt solution is higher than 70%, extracting reaction liquid from a bottom tower residue discharging hole, and extracting a gas mixture of ammonia gas, carbon dioxide and water on the top of the tower. According to the decomposition method, the carbonatite serves as both a reaction raw material and a filler of the reaction tower, distillation is carried out while reaction is carried out, and carbonatite decomposition and ammonia recycling are synchronously realized in one reaction tower.

Description

technical field [0001] The invention relates to a method for decomposing carbonate ore, in particular to a method for decomposing carbonate ore by using ammonium salt solution. Background technique [0002] At present, in the carbonate industry, carbonate ore is usually used as a raw material, and the CO required for the reaction is obtained by calcination. 2 , and use the oxide obtained by calcination and the by-product ammonium salt to react to recover ammonia. For example, the soda ash production process and the light magnesium carbonate production process both involve the process of using carbonate ore as a raw material and recovering ammonia by distilling ammonia. CO2 is obtained by calcining limestone in the production of soda ash by ammonia-soda method 2 and CaO, CaO is used as the raw material for the subsequent reaction, and the by-product NH 4 Cl and milk of lime react to distill ammonia to achieve the purpose of recycling ammonia. The method includes four unit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/06C04B2/10C01D7/12C01C1/02
CPCY02P40/40
Inventor 钟劲光梁鹏贵刘星钟颖苑蔡金皆许四通
Owner LONGYAN ZIYUN CHEM TECH