CN1587508A - Method for producing light calcium carbonate product with white mud - Google Patents
Method for producing light calcium carbonate product with white mud Download PDFInfo
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- CN1587508A CN1587508A CN 200410077991 CN200410077991A CN1587508A CN 1587508 A CN1587508 A CN 1587508A CN 200410077991 CN200410077991 CN 200410077991 CN 200410077991 A CN200410077991 A CN 200410077991A CN 1587508 A CN1587508 A CN 1587508A
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- calcium carbonate
- white mud
- carbonate product
- light calcium
- producing light
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Abstract
The present invention relates to recovery technological of white mud as one side product of recovering alkali from papermaking pulp. The process of preparing light calcium carbonate product with white mud includes the following steps: sieving to eliminate impurity, washing, grinding, sieving, and increased pressure filtering to dewater and stoving. The pressure filtering to dewater as the key step can raise the concentration of white mud from 15-25 wt% to 50-75 wt%, and the dewatered white mud is then stoved to reach dryness up to 99.5 %. The said technological process raises the value of recovered white mud, and the prepared calcium carbonate product may be used widely in plastic, rubber, paint, paper making and other fields.
Description
Technical field
The present invention relates to a kind of accessory products---recovery technology of white clay that in paper-making pulping alkali reclaims, produces.
Background technology
The primary pollution source that papermaking produces in the The modern industry is the black liquor that produces in the pulping digestion process.Be processed into cooking technique as the black liquor that generally adopts, be supporting alkali recycling engineering at present, by concentrating and burning the non-cellulose in the black liquor, lignin are burnt, add lime (calcium oxide) by causticization again, the soda ash (sodium carbonate) that caustic soda in the combustion process (NaOH) is become is reduced into caustic soda and turns back to slurrying again and be used for the boiling reuse.Problem is that alkali is recovered in and need produces the less relatively alkali secondary pollutant of another harm when reclaiming caustic soda, and the formal name used at school white clay is to change the leather hard solid waste that forms by lime by causticization, and its Main Ingredients and Appearance is a calcium carbonate.
So far, the main processing method of white clay has two kinds: the one, and calcining.In developed countries such as Japan and America and Europes, papermaking is based on pure wood pulp, treating white clay can adopt direct calcining method to prepare lime to reclaim, the special-purpose calcining furnace structure that just adopts is special, involve great expense and with the cost of white clay lime calcining also apparently higher than general limestone calcination, be two to three times of common lime retail price generally speaking, significant discomfort should be promoted at home.At the situation of China based on papermaking straw pulp, also there is following problem in burning of lime sludge: it is too high 1. to calcine cost, and quality should not guarantee; 2. the silicate in the white clay has corrosivity, often corrodes the limekiln wall when high-temperature calcination.So owing to reason calcination methods such as cost and technology are unsuitable for promoting at home.
The 2nd, the preparation paper filler-calcium carbonate.I am in patent of invention " the white clay recovering process " (number of patent application: 01144535.1) disclose a kind of method that the white clay recycling is prepared paper filler-calcium carbonate of application on December 19 calendar year 2001, but the calcium carbonate of this method preparation only limits to the papermaking filler product, and be pulpous state, range of application is narrow, can't further promote the economic value added that white clay reclaims.
Summary of the invention
Purpose of the present invention just provides a kind of recovery of new white clay later stage process, in order to the preparation light calcium carbonate product.
The objective of the invention is to realize: this method with producing light calcium carbonate product with white mud by following technical scheme, comprise following operation: sieve (1), and removal of impurities, (2) are cleaned, grind (3), sieve (4), and its improvements are also to comprise following operation: the dehydration of (5) pressure filtration, (6) oven dry.
Above-mentioned method with producing light calcium carbonate product with white mud, required pressure limit is 0.3～3.0MPa in described (5) pressure filtration dehydration procedure.
Process of the present invention is to prepare on the basis of papermaking filler level calcium carbonate slurry at white clay, increases pressure filtration dehydration and baking operation.The pressure filtration dehydration procedure is a critical process, can make the concentration of white clay material reach 50%～75% mass dryness fraction by 15%～25%, has thoroughly solved white mud calcium carbonate de-watering of slurries problem of difficult.Light calcium carbonate product mass dryness fraction after the drying can arrive about 99.5% again.This process has further promoted the economic value added that white clay reclaims, prepared light calcium carbonate product can be widely used in fields such as plastics, rubber, coating and papermaking, have considerable economic,, also have remarkable social benefit from environmental angle.
Description of drawings
Fig. 1 is a process chart of the present invention.
The specific embodiment
Below in conjunction with accompanying drawing the present invention is described in further detail:
See also shown in Figure 1ly, the semi-solid white clay that alkali is reclaimed sieves after the removal of impurities, cleans, and utilizes the special-purpose sand mill of white clay to grind again and separates the regular granularity of wadding.Re-use the former filter-press after sieving the white clay material is dewatered, under the pressure of 0.3～3.0MPa, make the concentration of material reach 50～75% mass dryness fractions, through after the oven dry, make light calcium carbonate product reach 99.5% left and right sides mass dryness fraction again by 15～25%.Again the good light calcium carbonate product (PCC) of oven dry is carried out bag distribution packaging at last, promptly be prepared into broad-spectrum light calcium carbonate product.
Claims (2)
1, a kind of method with producing light calcium carbonate product with white mud comprises following operation: sieve (1), and removal of impurities, (2) are cleaned, grind (3), sieve (4), it is characterized in that also comprising following operation: the dehydration of (5) pressure filtration, (6) oven dry.
2, a kind of method with producing light calcium carbonate product with white mud according to claim 1 is characterized in that required pressure limit is 0.3～3.0MPa in described (5) pressure filtration dehydration procedure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410077991 CN1587508A (en) | 2004-09-23 | 2004-09-23 | Method for producing light calcium carbonate product with white mud |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410077991 CN1587508A (en) | 2004-09-23 | 2004-09-23 | Method for producing light calcium carbonate product with white mud |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1587508A true CN1587508A (en) | 2005-03-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410077991 Pending CN1587508A (en) | 2004-09-23 | 2004-09-23 | Method for producing light calcium carbonate product with white mud |
Country Status (1)
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| CN (1) | CN1587508A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102786732A (en) * | 2012-09-07 | 2012-11-21 | 上海第二工业大学 | Method for producing plastic filling master batch through papermaking waste white mud |
| CN103230840A (en) * | 2013-04-28 | 2013-08-07 | 北京沃特玛德环境技术股份有限公司 | Process for conducting dehydration control on white clay calcium carbonate |
| CN103509377A (en) * | 2013-08-23 | 2014-01-15 | 造纸工业生产力促进中心 | Refined calcium carbonate pigment prepared from alkali-recycled white clay and preparation method thereof |
| CN103882765A (en) * | 2012-12-24 | 2014-06-25 | 造纸工业生产力促进中心 | Method for improving sizing performance of white mud calcium carbonate filled paper |
| CN104532650A (en) * | 2014-07-10 | 2015-04-22 | 华南理工大学 | Method for preparing white clay filling material for improving paper AKD glue applying efficiency |
| CN106883471A (en) * | 2017-04-26 | 2017-06-23 | 湖南师范大学 | A kind of white clay reclaims method of comprehensive utilization |
-
2004
- 2004-09-23 CN CN 200410077991 patent/CN1587508A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102786732A (en) * | 2012-09-07 | 2012-11-21 | 上海第二工业大学 | Method for producing plastic filling master batch through papermaking waste white mud |
| CN102786732B (en) * | 2012-09-07 | 2014-07-23 | 上海第二工业大学 | Method for producing plastic filling master batch through papermaking waste white mud |
| CN103882765A (en) * | 2012-12-24 | 2014-06-25 | 造纸工业生产力促进中心 | Method for improving sizing performance of white mud calcium carbonate filled paper |
| CN103882765B (en) * | 2012-12-24 | 2016-08-24 | 中国制浆造纸研究院 | A kind of method improving white mud calcium carbonate filled paper sizability |
| CN103230840A (en) * | 2013-04-28 | 2013-08-07 | 北京沃特玛德环境技术股份有限公司 | Process for conducting dehydration control on white clay calcium carbonate |
| CN103230840B (en) * | 2013-04-28 | 2014-07-23 | 王梅林 | Process for conducting dehydration control on white clay calcium carbonate |
| CN103509377A (en) * | 2013-08-23 | 2014-01-15 | 造纸工业生产力促进中心 | Refined calcium carbonate pigment prepared from alkali-recycled white clay and preparation method thereof |
| CN103509377B (en) * | 2013-08-23 | 2015-11-25 | 中国制浆造纸研究院 | Calcium carbonate pigment that a kind of alkali recovery white slime is refining and preparation method thereof |
| CN104532650A (en) * | 2014-07-10 | 2015-04-22 | 华南理工大学 | Method for preparing white clay filling material for improving paper AKD glue applying efficiency |
| CN106883471A (en) * | 2017-04-26 | 2017-06-23 | 湖南师范大学 | A kind of white clay reclaims method of comprehensive utilization |
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