CN101418527A - Deinking process for waste paper - Google Patents
Deinking process for waste paper Download PDFInfo
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- CN101418527A CN101418527A CNA2008102382448A CN200810238244A CN101418527A CN 101418527 A CN101418527 A CN 101418527A CN A2008102382448 A CNA2008102382448 A CN A2008102382448A CN 200810238244 A CN200810238244 A CN 200810238244A CN 101418527 A CN101418527 A CN 101418527A
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Abstract
The invention belongs to the field of a papermaking technology and in particular relates to a method for deinking waste paper through the addition of alkali recovered white mud. The method comprises the following steps: firstly, water, the alkali recovered white mud, sodium hydrate, sodium silicate, a deinking agent and the waste paper are sequentially added, mixed and crushed for a period of time; secondly, the mixture is added with hydrogen peroxide and is crushed for a period of time; and finally, the mixture is subjected to floatation deinking through the prior floatation deinking system. The method adds the alkali recovered white mud in the process of crushing the waste paper, reduces the use amount of the hydrogen peroxide, the sodium hydrate and the sodium silicate in the deinking process, improves the ash content and fiber yield of pulp and reduces production cost and pollution of the alkali recovered white mud as industrial garbage for landfill.
Description
Technical field:
The invention belongs to pulp technology for making paper, especially relate to a kind of deinking process for waste paper that adds alkali recovery white slime.
Background technology:
In the paper industry, deinking method commonly used is chemical deinking method, and chemical deinking method generally adopts hydrogen peroxide, caustic soda, sodium metasilicate and deinking agent to carry out deinking, and the amount of chemicals used that this method is used is bigger, and the sicker that mixes in the intractable waste paper.Existing de-inking method is a kind of to be that waste paper and caustic soda, sodium metasilicate, deinking agent, hydrogen peroxide are together carried out floatation and ink removing behind the size degradation, and another kind is that waste paper and deinking agent, foaming agent are together being bleached after the size degradation flotation.The amount ratio of preceding a kind of method hydrogen peroxide, caustic soda and sodium metasilicate is bigger, and the paper pulp ash content and the yield of acquisition are lower, and the commodity pearl filler amount that need add when being used to manufacture paper with pulp is bigger.A kind of method in back mainly is the pulp brightness instability that obtains, and also exists ash content and yield lower simultaneously, the bigger problem of commodity pearl filler amount that need add when being used to manufacture paper with pulp.
Simultaneously, development along with paper industry, the alkali recovery white slime of paper industry also causes people's attention gradually to the pollution of environment, the main component of this white clay is precipitated calcium carbonate and small part caustic soda and sodium metasilicate, produce the whiting packing technique though developed alkali recovery white slime now, but because investment is high, production cost is high, and can not 100% substitute goods calcium carbonate, bring certain difficulty for the popularization of this technology of enterprise, in fact a large amount of alkali recovery white slimes all is used as industrial refuse to carry out landfill and influences environment.
Summary of the invention:
The invention provides a kind of deinking process for waste paper, it adds alkali recovery white slime in the repulping of waste paper process, can reduce the consumption of hydrogen peroxide in the deinking process, caustic soda and sodium metasilicate, improve the ash content and the fiber yield of paper pulp, reduce production costs, simultaneously also reduced alkali recovery white slime and carried out the pollution of landfill, solved problems of the prior art as industrial refuse.
The present invention solves the problems of the technologies described above the technical scheme that is adopted to be: a kind of deinking process for waste paper comprises the steps:
(1), in hydrabrusher, adds 40～85 ℃ the hot water that is equivalent to 6～10 times of waste paper weight;
(2), successively add the caustic soda that is equivalent to waste paper weight 0.1～2.5%, 0.1～3.0% sodium metasilicate, 0.5～10% alkali recovery white slime and 0.05～0.3% deinking agent;
(3), in hydrabrusher, drop into waste paper, size degradation 10～15min;
(4), again add 0.5～2% hydrogen peroxide, again size degradation 20～30min;
Utilize traditional floatation and ink removing system to carry out floatation and ink removing then.
In the said method, caustic soda weight (folding 100%, as follows) for being equivalent to 0.1～2.5% of waste paper weight, sodium metasilicate (folding 100%, as follows) is 0.1～3.0%, and alkali recovery white slime (is rolled over 100% solid content, as follows) be 0.5～10%, deinking agent is 0.05～0.3%, and hydrogen peroxide (folding 100%, as follows) is 0.5～2%.
Above-mentioned deinking process for waste paper, more preferably technical scheme is:
(1), in hydrabrusher, adds 60～85 ℃ the hot water that is equivalent to 6～8 times of waste paper weight;
(2), successively add the caustic soda that is equivalent to waste paper weight 0.8～1.5%, 0.3～1.5% sodium metasilicate, 2.0～5.0% alkali recovery white slime and 0.15～0.3% deinking agent;
(3), in hydrabrusher, drop into waste paper, size degradation 10～13min;
(4), again add 0.5～1.5% hydrogen peroxide, again size degradation 20～25min;
Utilize traditional floatation and ink removing system to carry out floatation and ink removing then.
The concentration of described alkali recovery white slime is 15～65%, and the ISO whiteness is greater than 75 degree, and effective alkali content (to the white clay solid content, as follows) is 0.1～5.0%, and hydrochloric acid insoluble substance content (to the white clay solid content, as follows) is 1～10%.
Described deinking agent is biology enzyme deinking agent or soap deinking agent.
Described waste paper is that 8# U.S. is useless or 37# is U.S. useless.
Above-mentioned deinking process for waste paper, the best-of-breed technology scheme is:
(1), 80 ℃ the hot water that in hydrabrusher, adds 7000ml;
(2), add successively sequentially that concentration is 30%, proportion is the liquid caustic soda 25ml of 1.35 ± 2g/1; Baume degrees 〉=° Be`38, modulus are 3.0～4.5 liquid sodium silicate 6.66ml; Concentration is 50% the alkali recovery white slime 80g and the biology enzyme liquid deinking agent 2.5g of content 100%;
(3), in hydrabrusher, drop into the U.S. useless 1000g of 8#, size degradation 10min;
(4), again add concentration and be 27.5% hydrogen peroxide 27.5ml, again size degradation 25min;
Utilize traditional floatation and ink removing system to carry out floatation and ink removing then.
In practical operation, used chemicals can select that concentration is 30%, proportion is the liquid caustic soda of 1.35 ± 2g/l for use; Baume degrees 〉=oBe`38, modulus are 3.0～4.5 liquid sodium silicate; Concentration is 27.5% hydrogen peroxide.
Deinking agent can be selected the enzymatic deinking agent of 100% content for use, and what select for use usually is the deinking agent of Green Fil.
What alkali recovery white slime was selected for use is that concentration is 15～65%, and the ISO whiteness is greater than 75 degree, effective alkali content 0.1～5.0%, hydrochloric acid insoluble substance content 1～10%.
The principle of this deinking process for waste paper is to utilize caustic soda and sodium metasilicate in the alkali recovery white slime to reduce commodity caustic soda and the sodium metasilicate consumption that uses in the Waste Paper Handling process, greatly reduce production cost, the alkali recovery white slime main component belongs to loose porous precipitated calcium carbonate simultaneously, can promote the part ink particle that separation, absorption and the parcel waste paper of waste paper fibre remove in the size degradation process, prevent to combine with fiber once more, help improving the printing ink separating effect of flotation operation from the printing ink that waste paper fibre separates.Come out by FLOTATION SEPARATION through the part of the white mud calcium carbonate in the paper pulp after flotation parcel ink particle, a part is washed out through desanding and washing facility, remaining part is followed paper pulp as filler and is entered the alternative small part commodity of machine hand's preface calcium carbonate, reduces the papermaking cost.Hydrogen peroxide adds after a period of time at size degradation again, has had to be beneficial to improve the whitening effect of hydrogen peroxide to waste paper, reduce hydrogen peroxide consumption.
The specific embodiment:
For clearly demonstrating the technical characterstic of this programme, below by the specific embodiment, the present invention will be described in detail.
Embodiment one:
Carry out deinking through following step successively, deinking efficiency is referring to table one:
(1), 80 ℃ the hot water that in hydrabrusher, adds 7000ml;
(2), add successively sequentially that concentration is 30%, proportion is the liquid caustic soda 33.3ml of 1.35 ± 2g/l; Baume degrees 〉=° Be`38, modulus are 3.0～4.5 liquid sodium silicate 16.5ml; Concentration is 50%, ISO whiteness 80%, effective alkali content 0.5%, the alkali recovery white slime 80g of hydrochloric acid insoluble substance content 5% and Green Fil liquid culture paper deinking agent 2.5g;
(3), it is U.S. useless to drop into 37# in hydrabrusher---a kind of waste and old cultural paper 1000g that is exclusively used in the deinking bleaching, size degradation 10min;
(4), again add concentration and be 27.5% hydrogen peroxide 36.36ml, again size degradation 25min;
Carry out floatation and ink removing with traditional floatation and ink removing system then.Carry out desanding, screening and washing pulping at last.
Table one
| Compare item | Do not add (all) before the alkali recovery white slime | Behind the interpolation alkali recovery white slime (all) |
| Whiteness % (ISO) | 85.6 | 87.5 |
| Ash content % | 4.1 | 6.1 |
| Secondary stock yield % | 80.9 | 83.3 |
| Fiber yield % | 76.8 | 77.2 |
Embodiment two:
Carry out deinking through following step successively, deinking efficiency is referring to table two:
(1), 80 ℃ the hot water that in hydrabrusher, adds 7000ml;
(2), add successively sequentially that concentration is 30%, proportion is the liquid caustic soda 33.3ml of 1.35 ± 2g/l; Baume degrees 〉=° Be`38, modulus are 3.0～4.5 liquid sodium silicate 16.65ml; Concentration is 50%, ISO whiteness 80 degree, effective alkali content 0.5%, the alkali recovery white slime 60g of hydrochloric acid insoluble substance content 5% and Green Fil liquid culture paper deinking agent 2.5g;
(3), it is U.S. useless to drop into 37# in hydrabrusher---a kind of waste and old cultural paper 1000g that is exclusively used in the deinking bleaching, size degradation 10min;
(4), again add concentration and be 27.5% hydrogen peroxide 36.36ml, again size degradation 25min;
Carry out floatation and ink removing with traditional floatation and ink removing system then.Carry out desanding, screening and washing pulping at last.
Table two
| Compare item | Do not add (all) before the alkali recovery white slime | Behind the interpolation alkali recovery white slime (all) |
| Whiteness % (ISO) | 85.6 | 87.2 |
| Ash content % | 4.1 | 5.8 |
| Secondary stock yield % | 80.9 | 82.9 |
| Fiber yield % | 76.8 | 77.1 |
Embodiment three:
Carry out deinking through following step successively, deinking efficiency is referring to table three:
(1), 80 ℃ the hot water that in hydrabrusher, adds 8000ml;
(2), add successively sequentially that concentration is 30%, proportion is the liquid caustic soda 33.3ml of 1.35 ± 2g/l; Baume degrees 〉=° Be`38, modulus are 3.0～4.5 liquid sodium silicate 16.65ml; Concentration is 50%, ISO whiteness 90 degree, effective alkali content 0.1%, the alkali recovery white slime 80g of hydrochloric acid insoluble substance content 1% and Green Fil liquid Newsprint Paper deinking agent 2.5g;
(3), it is U.S. useless to drop into 8# in hydrabrusher---a kind of old and useless newspaper 1000g that is exclusively used in the deinking bleaching, size degradation 10min;
(4), again add concentration and be 27.5% hydrogen peroxide 36.36ml, again size degradation 25min;
Carry out floatation and ink removing with traditional floatation and ink removing system then.Carry out desanding, screening and washing pulping at last.
Table three
| Compare item | Do not add (all) before the alkali recovery white slime | Behind the interpolation alkali recovery white slime (all) |
| Whiteness % (ISO) | 52.0 | 55.3 |
| Ash content % | 3.2 | 5.0 |
| Secondary stock yield % | 86.5 | 88.5 |
| Fiber yield % | 83.3 | 83.5 |
Embodiment four:
Carry out deinking through following step successively, deinking efficiency is referring to table four:
(1), 40 ℃ the hot water that in hydrabrusher, adds 6000ml;
(2), add successively sequentially that concentration is 30%, proportion is the liquid caustic soda 3.33ml of 1.35 ± 2g/l; Baume degrees 〉=° Be`38, modulus are 3.0～4.5 liquid sodium silicate 3.33ml; Concentration is 50%, ISO whiteness 75 degree, effective alkali content 0.1%, the alkali recovery white slime 10g of hydrochloric acid insoluble substance content 1% and Green Fil liquid Newsprint Paper deinking agent 0.5g;
(3), it is U.S. useless to drop into 8# in hydrabrusher---a kind of old and useless newspaper 1000g that is exclusively used in the deinking bleaching, size degradation 10min;
(4), again add concentration and be 27.5% hydrogen peroxide 18.18ml, again size degradation 25min;
Carry out floatation and ink removing with traditional floatation and ink removing system then.Carry out desanding, screening and washing pulping at last.
Table four
| Compare item | Do not add (all) before the alkali recovery white slime | Behind the interpolation alkali recovery white slime (all) |
| Whiteness % (ISO) | 47.9 | 49.3 |
| Ash content % | 3.4 | 3.7 |
| Secondary stock yield % | 88.3 | 88.6 |
| Fiber yield % | 84.9 | 84.9 |
Embodiment five:
Carry out deinking through following step successively, deinking efficiency is referring to table five:
(1), 80 ℃ the hot water that in hydrabrusher, adds 7000ml;
(2), add successively sequentially that concentration is 30%, proportion is the liquid caustic soda 3.33ml of 1.35 ± 2g/l; Baume degrees 〉=° Be`38, modulus are 3.0～4.5 liquid sodium silicate 3.33ml; Concentration is 50%, ISO whiteness 75 degree, effective alkali content 0.1%, the alkali recovery white slime 10g of hydrochloric acid insoluble substance content 1% and Green Fil liquid Newsprint Paper deinking agent 0.5g;
(3), it is U.S. useless to drop into 8# in hydrabrusher---a kind of old and useless newspaper 1000g that is exclusively used in the deinking bleaching, size degradation 10min;
(4), again add concentration and be 27.5% hydrogen peroxide 18.18ml, again size degradation 25min;
Carry out floatation and ink removing with traditional floatation and ink removing system then.Carry out desanding, screening and washing pulping at last.
Table five
| Compare item | Do not add (all) before the alkali recovery white slime | Behind the interpolation alkali recovery white slime (all) |
| Whiteness % (ISO) | 48.2 | 49.8 |
| Ash content % | 3.4 | 3.9 |
| Secondary stock yield % | 87.6 | 87.8 |
| Fiber yield % | 84.2 | 84.2 |
Embodiment six:
Carry out deinking through following step successively, deinking efficiency is referring to table six:
(1), 80 ℃ the hot water that in hydrabrusher, adds 7000ml;
(2), add successively sequentially that concentration is 30%, proportion is the liquid caustic soda 3.33ml of 1.35 ± 2g/l; Baume degrees 〉=° Be`38, modulus are 3.0～4.5 liquid sodium silicate 3.33ml; Concentration is 50%, ISO whiteness 75 degree, effective alkali content 0.1%, the alkali recovery white slime 200g of hydrochloric acid insoluble substance content 1% and Green Fil liquid Newsprint Paper deinking agent 2.5g;
(3), it is U.S. useless to drop into 8# in hydrabrusher---a kind of old and useless newspaper 1000g that is exclusively used in the deinking bleaching, size degradation 10min;
(4), again add concentration and be 27.5% hydrogen peroxide 18.18ml, again size degradation 25min;
Carry out floatation and ink removing with traditional floatation and ink removing system then.Carry out desanding, screening and washing pulping at last.
Table six
| Compare item | Do not add (all) before the alkali recovery white slime | Behind the interpolation alkali recovery white slime (all) |
| Whiteness % (ISO) | 48.6 | 53.1 |
| Ash content % | 3.4 | 6.9 |
| Secondary stock yield % | 87.5 | 91.4 |
| Fiber yield % | 84.1 | 84.5 |
Embodiment seven:
Carry out deinking through following step successively, deinking efficiency is referring to table seven:
(1), 80 ℃ the hot water that in hydrabrusher, adds 7000ml;
(2), add successively sequentially that concentration is 30%, proportion is the liquid caustic soda 3.33ml of 1.35 ± 2g/l; Baume degrees 〉=° Be`38, modulus are 3.0～4.5 liquid sodium silicate 99.9ml; Concentration is 50%, ISO whiteness 75 degree, effective alkali content 0.1%, the alkali recovery white slime 200g of hydrochloric acid insoluble substance content 1% and Green Fil liquid Newsprint Paper deinking agent 2.5g;
(3), it is U.S. useless to drop into 8# in hydrabrusher---a kind of old and useless newspaper 1000g that is exclusively used in the deinking bleaching, size degradation 10min;
(4), again add concentration and be 27.5% hydrogen peroxide 18.18ml, again size degradation 25min;
Carry out floatation and ink removing with traditional floatation and ink removing system then.Carry out desanding, screening and washing pulping at last.
Table seven
| Compare item | Do not add (all) before the alkali recovery white slime | Behind the interpolation alkali recovery white slime (all) |
| Whiteness % (ISO) | 48.9 | 53.4 |
| Ash content % | 3.3 | 6.8 |
| Secondary stock yield % | 87.2 | 91.1 |
| Fiber yield % | 83.9 | 84.3 |
Embodiment eight:
Carry out deinking through following step successively, deinking efficiency is referring to table eight:
(1), 80 ℃ the hot water that in hydrabrusher, adds 7000ml;
(2), add successively sequentially that concentration is 30%, proportion is the liquid caustic soda 83.25ml of 1.35 ± 2g/l; Baume degrees 〉=° Be`38, modulus are 3.0～4.5 liquid sodium silicate 99.9ml; Concentration is 50%, ISO whiteness 75 degree, effective alkali content 0.1%, the alkali recovery white slime 200g of hydrochloric acid insoluble substance content 1% and Green Fil liquid Newsprint Paper deinking agent 2.5g;
(3), it is U.S. useless to drop into 8# in hydrabrusher---a kind of old and useless newspaper 1000g that is exclusively used in the deinking bleaching, size degradation 10min;
(4), again add concentration and be 27.5% hydrogen peroxide 18.18ml, again size degradation 25min;
Carry out floatation and ink removing with traditional floatation and ink removing system then.Carry out desanding, screening and washing pulping at last.
Table eight
| Compare item | Do not add (all) before the alkali recovery white slime | Behind the interpolation alkali recovery white slime (all) |
| Whiteness % (ISO) | 50.5 | 54.9 |
| Ash content % | 3.2 | 6.7 |
| Secondary stock yield % | 85.7 | 89.6 |
| Fiber yield % | 82.5 | 82.9 |
Embodiment nine:
Carry out deinking through following step successively, deinking efficiency is referring to table nine:
(1), 80 ℃ the hot water that in hydrabrusher, adds 7000ml;
(2), add successively sequentially that concentration is 30%, proportion is the liquid caustic soda 83.25ml of 1.35 ± 2g/l; Baume degrees 〉=° Be`38, modulus are 3.0～4.5 liquid sodium silicate 99.9ml; Concentration is 50%, ISO whiteness 75 degree, effective alkali content 0.1%, the alkali recovery white slime 200g of hydrochloric acid insoluble substance content 1% and Green Fil liquid Newsprint Paper deinking agent 2.5g;
(3), it is U.S. useless to drop into 8# in hydrabrusher---a kind of old and useless newspaper 1000g that is exclusively used in the deinking bleaching, size degradation 10min;
(4), again add concentration and be 27.5% hydrogen peroxide 54.54ml, again size degradation 25min;
Carry out floatation and ink removing with traditional floatation and ink removing system then.Carry out desanding, screening and washing pulping at last.
Table nine
| Compare item | Do not add (all) before the alkali recovery white slime | Behind the interpolation alkali recovery white slime (all) |
| Whiteness % (ISO) | 51.9 | 56.3 |
| Ash content % | 3.2 | 6.7 |
| Secondary stock yield % | 86.4 | 90.3 |
| Fiber yield % | 83.2 | 83.6 |
Embodiment ten:
Carry out deinking through following step successively, deinking efficiency is referring to table ten:
(1), 80 ℃ the hot water that in hydrabrusher, adds 7000ml;
(2), add successively sequentially that concentration is 30%, proportion is the liquid caustic soda 83.25ml of 1.35 ± 2g/l; Baume degrees 〉=° Be`38, modulus are 3.0～4.5 liquid sodium silicate 99.9ml; Concentration is 50%, ISO whiteness 75 degree, effective alkali content 5.0%, the alkali recovery white slime 200g of hydrochloric acid insoluble substance content 1% and Green Fil liquid Newsprint Paper deinking agent 2.5g;
(3), it is U.S. useless to drop into 8# in hydrabrusher---a kind of old and useless newspaper 1000g that is exclusively used in the deinking bleaching, size degradation 10min;
(4), again add concentration and be 27.5% hydrogen peroxide 54.54ml, again size degradation 25min;
Carry out floatation and ink removing with traditional floatation and ink removing system then.Carry out desanding, screening and washing pulping at last.
Table ten
| Compare item | Do not add (all) before the alkali recovery white slime | Behind the interpolation alkali recovery white slime (all) |
| Whiteness % (ISO) | 51.9 | 55.5 |
| Ash content % | 3.2 | 6.7 |
| Secondary stock yield % | 86.4 | 90.1 |
| Fiber yield % | 83.2 | 83.4 |
Embodiment 11:
Carry out deinking through following step successively, deinking efficiency is referring to table ten one:
(1), 80 ℃ the hot water that in hydrabrusher, adds 7000ml;
(2), add successively sequentially that concentration is 30%, proportion is the liquid caustic soda 83.25ml of 1.35 ± 2g/l; Baume degrees 〉=° Be`38, modulus are 3.0～4.5 liquid sodium silicate 99.9ml; Concentration is 50%, ISO whiteness 75 degree, effective alkali content 5.0%, the alkali recovery white slime 200g of hydrochloric acid insoluble substance content 10% and Green Fil liquid Newsprint Paper deinking agent 2.5g;
(3), it is U.S. useless to drop into 8# in hydrabrusher---a kind of old and useless newspaper 1000g that is exclusively used in the deinking bleaching, size degradation 10min;
(4), again add concentration and be 27.5% hydrogen peroxide 54.54ml, again size degradation 25min;
Carry out floatation and ink removing with traditional floatation and ink removing system then.Carry out desanding, screening and washing pulping at last.
Table ten one
| Compare item | Do not add (all) before the alkali recovery white slime | Behind the interpolation alkali recovery white slime (all) |
| Whiteness % (ISO) | 51.9 | 55.5 |
| Ash content % | 3.2 | 6.4 |
| Secondary stock yield % | 86.4 | 89.8 |
| Fiber yield % | 83.2 | 83.4 |
Embodiment 12:
Carry out deinking through following step successively, deinking efficiency is referring to table ten two:
(1), 80 ℃ the hot water that in hydrabrusher, adds 7000ml;
(2), add successively sequentially that concentration is 30%, proportion is the liquid caustic soda 83.25ml of 1.35 ± 2g/l; Baume degrees 〉=° Be`38, modulus are 3.0～4.5 liquid sodium silicate 99.9ml; Concentration is 50%, ISO whiteness 90 degree, effective alkali content 5.0%, the alkali recovery white slime 200g of hydrochloric acid insoluble substance content 10% and Green Fil liquid Newsprint Paper deinking agent 2.5g;
(3), it is U.S. useless to drop into 8# in hydrabrusher---a kind of old and useless newspaper 1000g that is exclusively used in the deinking bleaching, size degradation 10min;
(4), again add concentration and be 27.5% hydrogen peroxide 54.54ml, again size degradation 25min;
Carry out floatation and ink removing with traditional floatation and ink removing system then.Carry out desanding, screening and washing pulping at last.
Table ten two
| Compare item | Do not add (all) before the alkali recovery white slime | Behind the interpolation alkali recovery white slime (all) |
| Whiteness % (ISO) | 51.9 | 56.7 |
| Ash content % | 3.2 | 6.5 |
| Secondary stock yield % | 86.4 | 89.9 |
| Fiber yield % | 83.2 | 83.4 |
Embodiment 13:
Carry out deinking through following step successively, deinking efficiency is referring to table ten three:
(1), 80 ℃ the hot water that in hydrabrusher, adds 10000ml;
(2), add successively sequentially that concentration is 30%, proportion is the liquid caustic soda 83.25ml of 1.35 ± 2g/l; Baume degrees 〉=° Be`38, modulus are 3.0～4.5 liquid sodium silicate 99.9ml; Concentration is 50%, ISO whiteness 90 degree, effective alkali content 5.0%, the alkali recovery white slime 200g of hydrochloric acid insoluble substance content 10% and Green Fil liquid Newsprint Paper deinking agent 2.5g;
(3), it is U.S. useless to drop into 8# in hydrabrusher---a kind of old and useless newspaper 1000g that is exclusively used in the deinking bleaching, size degradation 10min;
(4), again add concentration and be 27.5% hydrogen peroxide 54.54ml, again size degradation 25min;
Carry out floatation and ink removing with traditional floatation and ink removing system then.Carry out desanding, screening and washing pulping at last.
Table ten three
| Compare item | Do not add (all) before the alkali recovery white slime | Behind the interpolation alkali recovery white slime (all) |
| Whiteness % (ISO) | 52.5 | 57.1 |
| Ash content % | 3.2 | 6.4 |
| Secondary stock yield % | 85.1 | 88.5 |
| Fiber yield % | 82.0 | 82.1 |
Embodiment 14:
Carry out deinking through following step successively, deinking efficiency is referring to table ten four:
(1), 80 ℃ the hot water that in hydrabrusher, adds 10000ml;
(2), add successively sequentially that concentration is 30%, proportion is the liquid caustic soda 83.25ml of 1.35 ± 2g/l; Baume degrees 〉=° Be`38, modulus are 3.0～4.5 liquid sodium silicate 99.9ml; Concentration is 50%, ISO whiteness 90 degree, effective alkali content 5.0%, the alkali recovery white slime 200g of hydrochloric acid insoluble substance content 10% and Green Fil liquid Newsprint Paper deinking agent 3.0g;
(3), it is U.S. useless to drop into 8# in hydrabrusher---a kind of old and useless newspaper 1000g that is exclusively used in the deinking bleaching, size degradation 10min;
(4), again add concentration and be 27.5% hydrogen peroxide 72.72ml, again size degradation 25min;
Carry out floatation and ink removing with traditional floatation and ink removing system then.Carry out desanding, screening and washing pulping at last.
Table ten four
| Compare item | Do not add (all) before the alkali recovery white slime | Behind the interpolation alkali recovery white slime (all) |
| Whiteness % (ISO) | 52.8 | 57.4 |
| Ash content % | 3.1 | 6.4 |
| Secondary stock yield % | 85.1 | 88.9 |
| Fiber yield % | 81.9 | 82.5 |
The seeing the following form of each chemicals among the embodiment one to 14 with numerical quantity:
The present invention does not describe part in detail, is those skilled in the art of the present technique's known technology.
Claims (6)
1, a kind of deinking process for waste paper is characterized in that: comprise the steps:
(1), in hydrabrusher, adds 40～85 ℃ the hot water that is equivalent to 6～10 times of waste paper weight;
(2), successively add the caustic soda that is equivalent to waste paper weight 0.1～2.5%, 0.1～3.0% sodium metasilicate, 0.5～10% alkali recovery white slime and 0.05～0.3% deinking agent;
(3), in hydrabrusher, drop into waste paper, size degradation 10～15min;
(4), again add 0.5～2% hydrogen peroxide, again size degradation 20～30min;
Utilize traditional floatation and ink removing system to carry out floatation and ink removing then.
2, a kind of deinking process for waste paper according to claim 1 is characterized in that: comprise the steps:
(1), in hydrabrusher, adds 60～85 ℃ the hot water that is equivalent to 6～8 times of waste paper weight;
(2), successively add the caustic soda that is equivalent to waste paper weight 0.8～1.5%, 0.3～1.5% sodium metasilicate, 2.0～5.0% alkali recovery white slime and 0.15～0.3% deinking agent;
(3), in hydrabrusher, drop into waste paper, size degradation 10～13min;
(4), again add 0.5～1.5% hydrogen peroxide, again size degradation 20～25min;
Utilize traditional floatation and ink removing system to carry out floatation and ink removing then.
3, a kind of deinking process for waste paper according to claim 1 and 2 is characterized in that: the concentration of described alkali recovery white slime is 15～65%, and the ISO whiteness is greater than 75 degree, and effective alkali content is 0.1～5.0%, and hydrochloric acid insoluble substance content is 1～10%.
4, a kind of deinking process for waste paper according to claim 1 and 2 is characterized in that: described deinking agent is biology enzyme deinking agent or soap deinking agent.
5, a kind of deinking process for waste paper according to claim 1 and 2 is characterized in that: described waste paper is that 8# U.S. is useless or 37# is U.S. useless.
6, a kind of deinking process for waste paper according to claim 1 and 2, it is characterized in that: this method comprises the steps:
(1), 80 ℃ the hot water that in hydrabrusher, adds 7000ml;
(2), add successively sequentially that concentration is 30%, proportion is the liquid caustic soda 25ml of 1.35 ± 2g/l; Baume degrees ° Be`38, modulus are 3.0～4.5 liquid sodium silicate 6.66ml; Concentration is 50% the alkali recovery white slime 80g and the biology enzyme liquid deinking agent 2.5g of content 100%;
(3), in hydrabrusher, drop into the U.S. useless 1000g of 8#, size degradation 10min;
(4), again add concentration and be 27.5% hydrogen peroxide 27.5ml, again size degradation 25min;
Utilize traditional floatation and ink removing system to carry out floatation and ink removing then.
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| CN2008102382448A CN101418527B (en) | 2008-12-11 | 2008-12-11 | Deinking process for waste paper |
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| CN2008102382448A CN101418527B (en) | 2008-12-11 | 2008-12-11 | Deinking process for waste paper |
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| CN101418527B CN101418527B (en) | 2010-11-03 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101775749A (en) * | 2010-03-05 | 2010-07-14 | 杨树香 | Deinking, bleaching and treating process of waste paper |
| CN102108645A (en) * | 2010-12-17 | 2011-06-29 | 山东轻工业学院 | Recovery processing process for heat transfer printing paper |
| CN102493247A (en) * | 2011-12-14 | 2012-06-13 | 中冶美利浆纸有限公司 | Application of book paper to wastepaper deinking instead of office wastepaper |
| CN105133409A (en) * | 2015-08-13 | 2015-12-09 | 合肥龙发包装有限公司 | Waste paper deinking method |
| CN109930414A (en) * | 2017-12-15 | 2019-06-25 | 中国制浆造纸研究院有限公司 | A kind of waste paper deinking agent based on cold alkali density waste liquid |
| CN110552236A (en) * | 2019-09-09 | 2019-12-10 | 杭州海鑫纸业有限公司 | Black paper and preparation process thereof |
-
2008
- 2008-12-11 CN CN2008102382448A patent/CN101418527B/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101775749A (en) * | 2010-03-05 | 2010-07-14 | 杨树香 | Deinking, bleaching and treating process of waste paper |
| CN102108645A (en) * | 2010-12-17 | 2011-06-29 | 山东轻工业学院 | Recovery processing process for heat transfer printing paper |
| CN102108645B (en) * | 2010-12-17 | 2012-06-06 | 山东轻工业学院 | Recovery processing process for heat transfer printing paper |
| CN102493247A (en) * | 2011-12-14 | 2012-06-13 | 中冶美利浆纸有限公司 | Application of book paper to wastepaper deinking instead of office wastepaper |
| CN105133409A (en) * | 2015-08-13 | 2015-12-09 | 合肥龙发包装有限公司 | Waste paper deinking method |
| CN109930414A (en) * | 2017-12-15 | 2019-06-25 | 中国制浆造纸研究院有限公司 | A kind of waste paper deinking agent based on cold alkali density waste liquid |
| CN110552236A (en) * | 2019-09-09 | 2019-12-10 | 杭州海鑫纸业有限公司 | Black paper and preparation process thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101418527B (en) | 2010-11-03 |
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