CN1349861A - White clay recovering process - Google Patents
White clay recovering process Download PDFInfo
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- CN1349861A CN1349861A CN 01144535 CN01144535A CN1349861A CN 1349861 A CN1349861 A CN 1349861A CN 01144535 CN01144535 CN 01144535 CN 01144535 A CN01144535 A CN 01144535A CN 1349861 A CN1349861 A CN 1349861A
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- sieving
- white clay
- impurities
- grinding
- remove impurity
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Abstract
The technological process for recovering white mud-by-product produced in production of paper-making industry includes the following steps: (1). preparing material, (2). sieving to remove impurity, (3). cleaning, (4). adding CO2 gas to make carbonization treatment, (5). sieving to remove impurity and (6). primary storage. Its improvement lies in that it also includes the processes (7). grinding and (8). sieving to remove impurity. The grinding process by adopting vertical grinding machine is the key for refining white mud, said process can separate partial silicon salt and can make CaCO3 granules uniform and fine, and the process of sieving to remove impurity can remove the impurities of silicon and free carbon, etc. from regularized white mud, and can used the white mud as paper-making filler for direct back-filling.
Description
Technical field
The present invention relates to a kind of accessory substance---recovery technology of white clay that in paper industry is produced, produces.
Background technology
In recent years, China's paper-making industry had had very great development, but because China's timber resources scarcity, and straw resource is abundant and cheap, so paper making raw material is based on non-wood-fiber, and in quite long from now on period, still keep the straw pulp, reed pulp, sugarcane slurry of some etc.In present paper industry, the causticization white clay is the accessory substance in the alkali recovery process, and its processing method mainly contains calcination method, chemical method, WATER-WASHING METHOD.1, calcination method mainly is applicable to wood pulp papermaking, is straw pulp class raw material but at present China extensively adopts, and because impurity such as silicon is too much in the causticization white clay, and being subjected to cost, technical restriction, calcination method is not suitable for papermaking straw pulp.2, adopt chemical method need dose chemical assistant, cost is not suitable for industrial production than higher.3, WATER-WASHING METHOD is that most of impurity and residual alkali that the white clay of caustic room discharge is removed wherein through several washing, carbonating processing and filtration operation are prepared into the filler that can supply papermaking to use.This method once was applied among a small circle, but along with press to improving constantly that paper product requires, can not satisfy the raw material standard of papermaking with the calcium carbonate of this simple process production.Because this material agglomerated particle quality is more open, fineness and whiteness are not high, usually occur the dry linting phenomenon in printing process, are difficult to satisfy present print request.Therefore, in view of above-mentioned several reasons, a lot of papermaking producer directly discharges the causticization white clay outside the factory or carries out landfill, and so both contaminated environment caused the waste of resource again.
Summary of the invention
Technical problem to be solved by this invention just provides a kind of new white clay recovering process, makes it on the basis of existing WATER-WASHING METHOD, increases grinding, removal of impurities operation, thereby improves the whiteness and the fineness of white clay greatly.
Technical problem to be solved by this invention is realized by following technical scheme:
This white clay recovering process comprises following operation: removal of impurities, (3) cleaning, (4) adding CO sieve for (1) batching, (2)
2Gas carries out that carbonating is handled, (5) sieve removal of impurities, (6) elementary storage, and its improvements are also to comprise following operation: grind (7), (8) removal of impurities of sieving.
Above-mentioned white clay recovering process, through behind (7) grinding step, material particular diameter is the 4-15 micron.
Above-mentioned white clay recovering process, described (8) sieve, and to count minimum be 325 orders for the order of the required sieve that passes through of removal of impurities operation.
Solution of the present invention is on the basis of traditional WATER-WASHING METHOD, has increased the grinding step and the removal of impurities operation of sieving of using vertical grinding machine.It is the key of white clay refinement treatment that vertical grinding machine grinds, and by this procedure part silicon salt is separated and CaCO
3The particle expansion is meticulous.The removal of impurities operation of sieving can make white clay obtaining rejecting after regular impurity such as wherein silicon, free carbon, then as the direct backfill of papermaking filler again.So both avoid contaminated environment, saved resource again.Below provide the check and analysis result of white clay before and after grinding:
Before the grinding: whiteness: 81;
Free alkali: 0.084%;
125 screen residues: 0.47%;
Settling volume: three hours is 3.0ml/g, and sedimentation is 2.95ml/g fully.
Grind the back: whiteness: 86;
Free alkali: 0.084%;
325 screen residues: 0.014%;
Settling volume: three hours is 6.0ml/g, and sedimentation is 4.25ml/g fully.
Through more as can be seen, spend than improving 5 before grinding after the grinding of white clay whiteness; Settling volume grinds the back than grinding the preceding 1.3ml/g of raising fully, and the residue on sieve after the grinding is also than low before grinding, and as seen, white clay has bigger improvement by the flatteness that grinds the back particle.
Description of drawings
Fig. 1 is a process chart of the present invention.
The specific embodiment
Below provide one embodiment of the present of invention:
As shown in Figure 1, after the white clay batching, the removal of impurities of sieving is gone into purge tank and is cleaned.The white clay slurries stir-precipitate-discharge water-add the water circulation through adding water one in purge tank, its pH value descends.White clay slurry after the washing pumps into carbonation tank, and adds CO
2Gas carries out carbonating to be handled, and the carbonating time is determined according to pH value (active CaO).When pH value met the requirements, white clay was through the vibratory sieve removal of impurities, and deposited storage tank in.Then elementary white clay raw material is pumped into special vertical grinding machine and grind, after grinding, the particle diameter of white clay material is between the 4-15 micron.After the grinding white clay material is crossed 325 mesh sieves, remove the impurity such as silicon salt, carbon of sand shape.Enter batch tank at last, be configured to certain density slurry with other filler by a certain percentage and make finished product, use for papermaking.
Claims (3)
1. white clay recovering process comprises following operation: sieving in (1) batching, (2), removal of impurities, (3) are cleaned, (4) add CO
2Gas carries out that carbonating is handled, (5) sieve removal of impurities, (6) elementary storage, it is characterized in that also comprising following operation: grind (7), (8) removal of impurities of sieving.
2. a kind of white clay recovering process according to claim 1 is characterized in that material particular diameter is the 4-15 micron through behind (7) grinding step.
3. a kind of white clay recovering process according to claim 1, to count minimum be 325 orders for the order of the required sieve that passes through of removal of impurities operation to it is characterized in that sieving described (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011445351A CN1169634C (en) | 2001-12-19 | 2001-12-19 | White clay recovering process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011445351A CN1169634C (en) | 2001-12-19 | 2001-12-19 | White clay recovering process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1349861A true CN1349861A (en) | 2002-05-22 |
| CN1169634C CN1169634C (en) | 2004-10-06 |
Family
ID=4677653
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011445351A Expired - Fee Related CN1169634C (en) | 2001-12-19 | 2001-12-19 | White clay recovering process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1169634C (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1320205C (en) * | 2004-07-27 | 2007-06-06 | 岳阳纸业股份有限公司 | Technology for mfg, high whiteness paper making filling light calcium carbonate recovered from lime mud |
| CN100441508C (en) * | 2007-01-21 | 2008-12-10 | 岳阳纸业股份有限公司 | New technique for refining filler of calcium carbonate from lime mud |
| CN102553890A (en) * | 2012-01-18 | 2012-07-11 | 牟作峰 | White mud recycling method |
| 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 |
| WO2014086048A1 (en) * | 2012-12-09 | 2014-06-12 | 李广 | High-concentration carbonation method for adjusting shape of lime mud (calcium carbonate) particles |
| 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 |
| CN104803405A (en) * | 2014-01-28 | 2015-07-29 | 李广 | White mud calcium carbonate treatment technology |
-
2001
- 2001-12-19 CN CNB011445351A patent/CN1169634C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1320205C (en) * | 2004-07-27 | 2007-06-06 | 岳阳纸业股份有限公司 | Technology for mfg, high whiteness paper making filling light calcium carbonate recovered from lime mud |
| CN100441508C (en) * | 2007-01-21 | 2008-12-10 | 岳阳纸业股份有限公司 | New technique for refining filler of calcium carbonate from lime mud |
| CN102553890A (en) * | 2012-01-18 | 2012-07-11 | 牟作峰 | White mud recycling method |
| WO2014086048A1 (en) * | 2012-12-09 | 2014-06-12 | 李广 | High-concentration carbonation method for adjusting shape of lime mud (calcium carbonate) particles |
| 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 |
| CN104803405A (en) * | 2014-01-28 | 2015-07-29 | 李广 | White mud calcium carbonate treatment technology |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1169634C (en) | 2004-10-06 |
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