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Method for producing precipitated calcium carbonate

A technology of precipitated calcium carbonate and production method, which is applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems of difficult temperature control, failure to meet process requirements, slow heating speed of hot air, etc., achieve stable furnace temperature and drying temperature, and remarkable environmental protection effect , The effect of stable drying temperature

Inactive Publication Date: 2010-02-17
徐铭
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AI Technical Summary

Problems solved by technology

Most enterprises use hand-fired furnace and chain furnace process combustion equipment for material drying. Internal combustion temperature, ventilation rate and other working conditions are greatly affected, which can easily cause heat loss and unstable output hot air temperature
(2) Hand-fired furnaces and chain furnaces require the use of high-quality bituminous coal, which has a high flame and fast combustion speed, and the coal cannot be completely burned, and the coal consumption is large
If anthracite is used, due to its low volatility and small flame, it mainly relies on radiation heat transfer, so the heating speed of hot air is slow, and the temperature is difficult to control, which cannot meet the process requirements
(3) The manual operation of the hand-burning furnace is labor-intensive and it is difficult to adjust the temperature
Although the operation of the chain furnace is convenient, it completely relies on high-quality coal in the selection of coal, and in the actual operation, the combustion is incomplete, the thermal efficiency is low, and the waste is large

Method used

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Examples

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Embodiment Construction

[0007] Put the limestone raw material in a crusher for crushing, put the crushed limestone in a sieve with a hole diameter of 5cm for screening, and wash the limestone with water at the same time, place the limestone after screening and washing in a vertical kiln for calcination, and the calcination temperature is controlled at 900 ℃——1300℃, the calcination time is controlled within 3-5 hours, and the quicklime is CaO; put the quicklime in the lime machine and add water to generate Ca(OH) 2 , put Ca(OH) 2 placed in a carbonization furnace, and then the CO absorbed during the calcination process 2 It is also added to the carbonization furnace for carbonization. The carbonization temperature is controlled between 85-95°C and the carbonization time is controlled within 1.5-2.5 hours to make liquid calcium carbonate, namely CaCO 3 ; The liquid calcium carbonate is CaCO 3 Place it in a centrifuge for dehydration to produce calcium carbonate with a water content of 30%, namely CaC...

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Abstract

The invention discloses a method for producing precipitated calcium carbonate, which comprises the following steps: crushing a limestone raw material; calcining the crushed limestone raw material after screening and water scrubbing; obtaining calcium oxide (CaO) after calcining; preparing calcium hydroxide by ashing the calcium oxide (CaO); generating liquid calcium carbonate by carbonizing the calcium hydroxide; and preparing calcium carbonate by dewatering and drying, wherein the drying method adopts an internally heated rotating furnace combining with a controllable temperature furnace in fluid bed, so the drying process has the advantages of no pollution, fast drying speed and good quality.

Description

technical field [0001] The invention relates to a production method of precipitated calcium carbonate. Background technique [0002] In the production of precipitated calcium carbonate industry, the drying process is the key to the quality control of the entire product in the middle process. Most enterprises use hand-fired furnace and chain furnace process combustion equipment for material drying. The internal combustion temperature, ventilation rate and other working conditions are greatly affected, which can easily cause heat loss and unstable output hot air temperature. (2) Hand-fired furnaces and chain furnaces require the use of high-quality bituminous coal, which has a high flame and fast combustion speed, and the coal cannot be completely burned, and the coal consumption is large. If anthracite is used, due to its low volatility and small flame, it mainly relies on radiation heat transfer, so the heating speed of hot air is slow, and the temperature is difficult to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18
Inventor 徐铭
Owner 徐铭
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