Continuous carbonation technology for producing calcium carbonate

A technology of calcium carbonate and carbonation, applied in the fields of calcium carbonate/strontium/barium, calcium/strontium/barium compounds, inorganic chemistry, etc., can solve problems such as equipment impact and adverse effects on performance, and achieve easy control of output and quality, and process Continuous, stable and easy-to-maintain effect

Inactive Publication Date: 2019-09-20
常熟美特钙业有限公司
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Problems solved by technology

In addition, when the blower starts and stops frequently, it will have a negative impact on the impact and performance of the equipment

Method used

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  • Continuous carbonation technology for producing calcium carbonate

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Embodiment

[0014] Such as figure 1 In the process, the reaction tank and the refining tank are connected in series, and a feed pump and a discharge pump are arranged at the feed pipe and the discharge pipe of the reaction tank, and a discharge pump is arranged at the discharge pipe of the refining tank (the discharge of the reaction tank The pump is also the feed pump for the refining tank)

[0015] Step 1. Mix calcium carbonate crystal nuclei with a particle size of 1.5-2 μm and slaked lime solution to form a slurry. The calcium carbonate crystal nuclei account for 5-10% of the slurry; continuously pump the above slurry (milk of lime) into the reaction At the same time, CO2 is introduced from the bottom of the reaction tank; the reaction occurs in the reaction tank, and the generated calcium carbonate continues to grow on the surface of the calcium carbonate crystal nucleus;

[0016] Step 2: Use a pump to pump the reacted calcium carbonate slurry out from the bottom, enter the refining...

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Abstract

The invention discloses a continuous carbonation technology for producing calcium carbonate. The continuous carbonation technology for producing the calcium carbonate comprises the steps of (1) mixing calcium carbonate crystal nuclei and a slaked lime solution to form slurry, pumping the slurry into a reaction tank continuously, and introducing CO2 from the bottom; (2) pumping out calcium carbonate slurry in the reaction tank from the bottom by means of a pump, controlling the slurry flow by measuring the conductivity of the slurry in real time, and guaranteeing that the liquid levels in the reaction tank and a refining tank are always in preset ranges; (3) injecting the calcium carbonate slurry, which is obtained through a reaction, into the refining tank, introducing CO2, and guaranteeing that a pH value in the reaction tank is 7-8.5; and (4) pumping a finished product material out of the refining tank, and cycling the process. According to the continuous carbonation technology for producing the calcium carbonate, the process is controlled by a PLC control system, the automation degree is high, the working procedures are continuous and stable, and the yield and the quality are easy to control; and equipment runs continuously, and is convenient to maintain.

Description

technical field [0001] The invention relates to a continuous carbonation process for preparing calcium carbonate. Background technique [0002] In the traditional production of calcium carbonate, the carbonation reaction is carried out in the carbonization tank. The milk of lime is pumped into the carbonization tank, and CO2 gas is introduced to carbonize the milk of lime to neutrality. After all the milk of lime is converted into calcium carbonate, the reaction is stopped, and the calcium carbonate The slurry is pumped into the storage tank of the next process, and then continues to be pumped into the milk of lime for the next batch of reaction, and so on, which means that all batch production techniques are used. [0003] Carbonation reaction equipment is the most critical and most expensive key equipment for calcium carbonate enterprises, and the utilization rate of calcium carbonate equipment is directly related to the return on investment. For intermittent calcium carb...

Claims

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Application Information

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IPC IPC(8): C01F11/18
CPCC01F11/181
Inventor 赵家文
Owner 常熟美特钙业有限公司
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