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Process for conducting dehydration control on white clay calcium carbonate

A technology of calcium carbonate and process, which is applied in the field of automatic dehydration control of white mud calcium carbonate, which can solve problems such as high water content, unclean scraping, and dissatisfied centrifuge feed.

Inactive Publication Date: 2014-07-23
BEIJING ALTERMODE ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 content, which is harmful to the later stage. Drying and dehydration consumes a lot of steam and 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

Method used

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  • Process for conducting dehydration control on white clay calcium carbonate

Examples

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Effect test

Embodiment 1

[0011] Example 1: A process for controlling the dehydration of lime mud calcium carbonate, such as figure 1 As shown, including the following steps:

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

[0013] Automatically start the centrifuge. The centrifuge starts to accelerate. When the speed is increased to 700 rpm (this acceleration time is about 1 minute), the feed valve is automatically opened, and the feed valve is closed immediately when the level sensor senses that the material is nearly full (This feeding time is about 60 seconds). At the same time, the centrifuge inverter continues to accelerate to 850 rpm. The start delay is about 60 seconds. The valve is opened for the second feeding (this feeding time is about 30 seconds). When the level sensor is activ...

Embodiment 2

[0016] Example 2: A process for controlling the dehydration of lime mud calcium carbonate, including the following steps:

[0017] Automatically start the feed pump motor, and at the same time start the feed pump inverter to start accelerating, until the feed pump outlet pressure increases to 0.2MPa, the feed pump accelerates and stops;

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

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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, and more specifically to a process for fully automatic dehydration control of white mud calcium carbonate. Background technique [0002] The refined white mud calcium carbonate is the sludge after alkali recovery for recycling. It is an important project of national environmental protection. The 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 very important for the later stage. Drying and dewatering consumes large amounts of steam and high energy consumption, and the commonly used centrifuge uses a single-feed single-layer scraping method, which makes the centrifuge feed unsatisfactory and scraped each time, and the failure rate is high. Summary of the invention [0003] In view of the shortcomings of the above-mentioned technology, the present invention provides a process for controlling the centrifuge...

Claims

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Application Information

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