Process for conducting dehydration control on white clay calcium carbonate

A calcium carbonate and process technology, applied in the field of automatic dehydration control of white mud calcium carbonate, can solve the problems of unclean scraping, unsatisfactory feeding of centrifuge, high water content, etc.

Inactive Publication Date: 2013-08-07
BEIJING ALTERMODE ENVIRONMENTAL TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0002] White mud refined into white mud calcium carbonate is recycled sludge after alkali recovery. It is an important project of national environmental protection. Dehydration of white mud calcium carbonate is an important step. The dehydration with ordinary vacuum pre-hanging machine has a large water c

Method used

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  • Process for conducting dehydration control on white clay calcium carbonate

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Effect test

Embodiment 1

[0011] Embodiment 1: a kind of technology that white mud calcium carbonate is carried out dehydration control, as figure 1 shown, including the following steps:

[0012] Automatically start the motor of the feed pump, and at the same time start the frequency converter of the feed pump to accelerate until the outlet pressure of the feed pump increases to 0.15MPa, and then the speed of the feed pump tracks the pressure change to ensure the flow rate is stable;

[0013] Automatically start the centrifuge. The inverter centrifuge starts to accelerate. When the speed increases to 700 rpm (the acceleration time is about 1 minute), the feed valve is automatically opened. When the level sensor senses that the material is almost full, the feed valve is immediately closed. (This feeding time is about 60 seconds), at the same time, the frequency converter of the centrifuge continues to accelerate to 850 rpm and starts to delay, about 60 seconds, open the valve for the second feeding (Thi...

Embodiment 2

[0016] Embodiment 2: a kind of technology that white mud calcium carbonate is carried out dehydration control comprises the steps:

[0017] Automatically start the motor of the feed pump, and at the same time start the frequency converter of the feed pump to accelerate until the outlet pressure of the feed pump increases to 0.2MPa, and the feed pump accelerates to stop;

[0018] Automatically start the centrifuge. The inverter centrifuge starts to accelerate. When the speed increases to 800 rpm, the feed valve will be opened automatically (the acceleration time is about 1 minute). When the level sensor senses that the material is almost full, the feed valve will be closed immediately. (This feed time is about 30 seconds), and at the same time, the centrifuge inverter continues to accelerate to 900 rpm and starts to delay. When the delay reaches the set time (such as 40 seconds), open the valve for the second feed (this feed The feeding time is about 20 seconds), at this time, ...

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Abstract

The invention relates to a dehydrating process, in particular to a process for conducting full-automatic dehydration control on white clay calcium carbonate. The process uses a distributed control system (DCS) to control a centrifugal machine to conduct full-automatic dehydration control on the white clay calcium carbonate and includes three steps of multi-time feeding, dehydration at different speeds and gradual material scraping. Devices required by feeding are controlled through DCS control configuration software respectively, a frequency conversion feeding pump motor and a pneumatic feeding adjusting valve in feeding are controlled, and a motor and valve control function block is programmed through control software. During dehydration, the DCS controls the frequency conversion dehydration motor directly to conduct speed adjusting. During material scraping, movement of a pneumatic cylinder is achieved through control of the DCS on an electromagnetic valve, so that a material scraper can scrape materials back and forth for a plurality of times. Whole-course monitoring and control are conducted through a step sequence mode in the whole process, an automation degree is high, centralized monitoring is achieved, labor production efficiency is high, operation stability and accuracy are high, product quality is high, and labor intensity is greatly reduced compared with a traditional control method.

Description

technical field [0001] The invention relates to a dehydration process, in particular to a process for fully automatic dehydration control of white mud calcium carbonate. Background technique [0002] White mud refined into white mud calcium carbonate is recycled sludge after alkali recovery. It is an important project of national environmental protection. Dehydration of white mud calcium carbonate is an important step. The dehydration with ordinary vacuum pre-hanging machine has a large water content, which is harmful to the later stage. Drying and dehydration consumes a lot of steam and high energy consumption, and the centrifuge usually used is a single-feed single-layer scraping method, which makes each centrifuge feed insufficient, the scraping material is not clean, and the failure rate is high. Contents of the invention [0003] Aiming at the deficiencies of the above-mentioned technologies, the present invention provides a process for controlling the centrifuge with...

Claims

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Application Information

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IPC IPC(8): B04B13/00C01F11/18B04B11/04B04B11/08
CPCY02P20/10
Inventor 王桂林王小林王玉志刘培成
Owner BEIJING ALTERMODE ENVIRONMENTAL TECH
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