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Calcium magnesium carbonate salt mine decomposition method

A calcium-magnesium carbonate, decomposition reaction technology, applied in the direction of lime production, etc., can solve the problems of reaction system energy consumption reduction, increase production cost, waste, etc., to reduce heat energy loss, ensure stable production, and reduce energy consumption costs Effect

Active Publication Date: 2016-02-24
LONGYAN ZIYUN CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method realizes the continuous progress of the reaction by controlling the temperature to steam the ammonia in the reaction system, but the big problem in this reaction is that the departure of ammonia is often accompanied by the departure of a large amount of water, which leads to two results, one The concentration of ammonia water obtained is low; the second is that a large amount of water needs to be evaporated to obtain quantitative ammonia, and the energy consumption of the reaction system cannot be effectively reduced
At the same time, this method also needs to add additional sulfuric acid and ammonium bicarbonate, which does not realize the full utilization of raw materials, causing waste and increasing production costs
Therefore, from the perspective of actual production, although the production method of ammonium salt decomposition of carbonate ore has certain feasibility in theory, it still cannot obtain a satisfactory industrial practice result.

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  • Calcium magnesium carbonate salt mine decomposition method

Examples

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Effect test

Embodiment 1

[0067] A kind of decomposition method of calcium magnesium carbonate ore is carried out in the multistage reactor connected in series, comprises the steps:

[0068] (1) get the limestone powder that particle diameter is 10-100 μ m and concentration is the ammonium chloride aqueous solution of 10wt% to form slurry after mixing, wherein, control the mol ratio of ammonium ion in the ammonium chloride aqueous solution and the calcium magnesium ion in the limestone powder for NH 4 + : (Ca+Mg)=2:1. The slurry enters the first-stage reactor through the feed port of the first-stage reactor for reaction, is discharged from the outlet of the reaction liquid at the bottom of the first-stage reactor, and then enters the next-stage reactor through the feed port of the next-stage reactor to continue the reaction , after successively reacting through 6 stages of series reactors, the calcium chloride solution and insoluble matter are taken out from the outlet of the reaction liquid at the b...

Embodiment 2

[0075] A method for decomposing calcium-magnesium carbonate ore is carried out in a tower reactor, comprising the steps of:

[0076] (1) Fill the reaction tower with limestone with a particle size of 1-5mm, and the filling height is 5m, so that the limestone can be used not only as a raw material for the reaction, but also as a filler for the reaction tower.

[0077] (2) the ammonium nitrate aqueous solution that concentration is 10wt% is passed into from the tower top ammonium salt solution feeding port of reaction tower, is evenly sprayed on limestone and reacts, and the calcium nitrate solution is taken out from the reaction solution outlet at the bottom of the tower, It is used as a raw material for the preparation of calcium compounds for subsequent production. Simultaneously, by adjusting the flow rate of the ammonium nitrate aqueous solution, the conversion rate of the ammonium nitrate aqueous solution is controlled to 70%. The conversion rate of the ammonium nitrate a...

Embodiment 3

[0084] A kind of decomposition method of calcium magnesium carbonate ore is carried out in the multistage reactor connected in series, comprises the steps:

[0085] (1) Take the magnesite powder with a particle size of 0.1~1mm and mix it with the ammonium sulfate aqueous solution with a concentration of 20wt% to form a slurry, wherein the molar ratio of the ammonium root in the ammonium sulfate aqueous solution to the calcium and magnesium ions in the magnesite powder NH 4 + : (Ca+Mg)=3:1. The slurry enters the primary reactor through the feed port of the primary reactor for reaction, is discharged from the outlet of the reaction liquid at the bottom of the primary reactor, and then enters the secondary reactor through the feed port of the secondary reactor to continue the reaction. The reaction product magnesium sulfate solution and insoluble matter are extracted from the outlet of the reaction liquid at the bottom of the secondary reactor. After solid-liquid separation, th...

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Abstract

The invention provides a calcium magnesium carbonate salt mine decomposition method which comprises the following steps: an ammonium salt solution is adopted to decompose calcium magnesium carbonate salt mine, the decomposition reaction is conducted in a series-connected multistage reactor or a tower-type reactor, heat carried by mixed gas generated by decomposition reaction of the ammonium salt solution and the calcium magnesium carbonate salt mine through heating are used as heat sources for recycling. According to the provided calcium magnesium carbonate salt mine decomposition method, through the introduction of the multistage countercurrent series-connected reaction kettle or the tower-type reactor, not only are the problems that a single-stage reaction kettle is large in water evaporation amount, the energy consumption is wasted, and ammonium carbonate is relatively low in concentration and unstable solved, but also the efficient and stable reaction of decomposition of the calcium magnesium carbonate salt mine by ammonium salt is realized, the energy consumption cost is reduced, and the method is energy-saving and economical.

Description

technical field [0001] The invention belongs to the field of chemical production, and relates to a method for decomposing calcium-magnesium carbonate ore, in particular to a method for decomposing calcium-magnesium carbonate ore by using ammonium salts. Background technique [0002] Carbonate minerals are widely distributed, among which calcium-magnesium carbonate minerals are the majority. The main forms of calcium magnesium carbonate include limestone and calcite mainly composed of calcium carbonate, magnesite mainly composed of magnesium carbonate, and dolomite containing both calcium carbonate and magnesium carbonate. At present, the utilization of carbonate mines is divided into two major directions. One is to directly purify the corresponding carbonates from carbonate mines and then obtain corresponding metal oxides, such as the production of magnesium carbonate, magnesium oxide, Light magnesium carbonate, calcium carbonate, calcium oxide, calcium hydroxide, etc.; the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B2/10
CPCY02P40/40
Inventor 钟劲光钟颖苑吴明
Owner LONGYAN ZIYUN CHEM TECH
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