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Method for preparing high-specific surface area precipitated calcium carbonate

A technology of precipitated calcium carbonate and high specific surface area, applied in calcium carbonate/strontium/barium, chemical instruments and methods, calcium/strontium/barium compounds, etc., can solve the problem of low calcium hydroxide concentration, difficult industrial application, and water resource consumption Large and other problems, to achieve high desulfurization efficiency, low production costs, good economic and social benefits

Inactive Publication Date: 2018-05-04
青州宇信钙业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the concentration of calcium hydroxide in this method is too low, the consumption of water resources is large, the yield is low, and the degree of agglomeration is high, and depolymerization is difficult, so it is difficult for industrial application

Method used

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  • Method for preparing high-specific surface area precipitated calcium carbonate

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preparation example Construction

[0029] The present embodiment relates to a kind of preparation method of precipitated calcium carbonate, the precipitated calcium carbonate of preparation has high specific surface area, specifically comprises the following steps:

[0030] Step 1. The quicklime obtained by calcination in the vertical kiln and the digested water are configured according to the ratio of 1:4 to 1:6 in mass ratio, and the digestion reaction is carried out. Impurities are removed, and the mesh number of the selected vibrating screen is gradually increased, and calcium hydroxide fine pulp is obtained after screening;

[0031] Step 2. Transport the fine calcium hydroxide slurry to a peeling machine for grinding for 30-60 minutes. The grinding medium is zirconium beads of 2-4 mm. After the grinding is completed, pass through a 200-mesh vibrating screen for impurity removal;

[0032] Step 3. Adjust the concentration of the ground calcium hydroxide slurry to 6-10%, cool the temperature to 15-20°C, and t...

Embodiment 1

[0038] Through the parameter setting of this embodiment, the specific surface area can be prepared to be 83.6m 2 The precipitated calcium carbonate of / g specifically comprises the following steps:

[0039] Step 1, the quicklime obtained by calcining the vertical kiln with 0.5% CaCl 2 The digested water is configured according to the mass ratio of 1:5. The temperature of the digested water is 70°C, and the digestion reaction is carried out. After the reaction is completed, the impurity is removed through 100 mesh, 200 mesh, and 320 mesh vibrating sieves. Calcium serum;

[0040] Step 2. Transport the fine calcium hydroxide slurry to a flake machine for grinding for 45 minutes. The grinding medium is zirconium beads of 2 mm. After the grinding is completed, pass through a 200-mesh vibrating sieve for impurity removal;

[0041] Step 3: Adjust the concentration of the ground calcium hydroxide slurry to 6%, cool the temperature to 15°C, and transport to 40m 3 In the carbonizatio...

Embodiment 2

[0044] Through the parameter setting of this embodiment, the specific surface area can be prepared to be 67.3m 2 The precipitated calcium carbonate of / g specifically comprises the following steps:

[0045] Step 1, the quicklime obtained by calcining the vertical kiln with 0.5% CaCl 2 The digested water is configured according to the mass ratio of 1:5. The temperature of the digested water is 70°C, and the digestion reaction is carried out. After the reaction is completed, the impurity is removed through 100 mesh, 200 mesh, and 320 mesh vibrating sieves. Calcium serum;

[0046] Step 2. Transport the fine calcium hydroxide slurry to a peeling machine for grinding for 30 minutes. The grinding medium is zirconium beads of 2 mm. After the grinding is completed, pass through a 200-mesh vibrating sieve for impurity removal;

[0047] Step 3. Adjust the concentration of the ground calcium hydroxide slurry to 8%, cool the temperature to 15°C, and transport it to 40m 3 In the carboni...

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Abstract

The invention discloses a method for preparing high-specific surface area precipitated calcium carbonate. The method comprises the following steps: proportioning quick lime obtained by shaft kiln burning and slaking water according to a ratio, carrying out a slaking reaction, and removing impurities by a vibrating screen; conveying concentrate calcium hydroxide into a stripper for grinding for 30-60 minutes, and passing through a 200-mesh vibrating screen so as to remove the impurities after grinding completion; regulating the concentration of the ground calcium hydroxide slurry to be 6-10%, reducing the temperature to 15-20 DEG C, conveying into a carbonization kettle, immediately adding a composite crystal-shape controller accounting for 0.2-0.8% of dry weight of the precipitated calciumcarbonate after a gelation process in the reaction system disappears, adding a dispersing agent accounting for 3-5% of the dry weight of the precipitated calcium carbonate when the conductivity of the reaction system is reduced to be 5.0ms / cm, and continuing carbonizing until the reaction is completed; and sequentially performing pressure filtration dehydration, drying, grinding and classifying on the calcium carbonate slurry obtained in the step 3. The precipitated calcium carbonate prepared in the invention is high in specific surface area and high in SO2 capture efficiency and is high in desulfurization efficiency and low in production cost.

Description

technical field [0001] The invention relates to the technical field of preparing precipitated calcium carbonate, in particular to a method for preparing precipitated calcium carbonate with a high specific surface area. Background technique [0002] Limestone powder as SO 2 A high-efficiency adsorbent, widely used in desulfurization process of coal-fired power plants and coal-fired boilers. The specific desulfurization principle is as follows: the limestone powder and coal are fully mixed in a certain proportion for combustion, and the limestone is decomposed into CaO during the combustion process. In a high temperature environment, CaO and SO 2 The reaction produces CaSO 4 , so as to realize the desulfurization process of flue gas. Although the process is simple to operate, because the CaO decomposed from limestone generally has a coarse particle size and a small specific surface area, it is difficult to capture SO 2 The efficiency is low, so that the desulfurization eff...

Claims

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Application Information

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IPC IPC(8): C01F11/18
CPCC01F11/181C01F11/183C01P2004/03C01P2006/12
Inventor 姚忠修颜干才杜年军
Owner 青州宇信钙业股份有限公司
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