CN115215567A - Method for preparing gypsum powder by using papermaking deinking sludge and application thereof - Google Patents
Method for preparing gypsum powder by using papermaking deinking sludge and application thereof Download PDFInfo
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- C04B11/00—Calcium sulfate cements
- C04B11/26—Calcium sulfate cements strating from chemical gypsum; starting from phosphogypsum or from waste, e.g. purification products of smoke
- C04B11/262—Calcium sulfate cements strating from chemical gypsum; starting from phosphogypsum or from waste, e.g. purification products of smoke waste gypsum other than phosphogypsum
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Abstract
The invention provides a method for preparing gypsum powder by using papermaking deinking sludge and application thereof. The method comprises the following steps: drying deinking sludge from a paper mill to constant weight, and crushing; putting deinked sludge powder into a crucible, burning at high temperature by using a muffle furnace, adding proper hydrochloric acid to react until no bubbles are generated, performing solid-liquid separation by using a centrifuge, performing suction filtration on the obtained solution, adding sodium sulfate solid into the filtrate, uniformly stirring, reacting for a period of time to obtain a large amount of calcium sulfate solid, performing suction filtration and washing on the calcium sulfate solid, and putting the calcium sulfate solid into an oven to perform a drying procedure to obtain the beta-hemihydrate gypsum. The invention can provide a new resource utilization mode for the waste deinking sludge, and has simple preparation process and required equipment, and very good environmental benefit and economic benefit.
Description
Technical Field
The invention relates to the field of papermaking sludge recycling technology and environmental protection, in particular to a method for preparing gypsum powder by utilizing papermaking deinking sludge and application thereof.
Background
Since the promulgation of the water pollution prevention and control law of the people's republic of China, the problem of how to treat the paper-making sludge generated in the paper-making production activity becomes a hotspot of pollution control, the early treatment of paper-making pollutants is mostly landfilled or discharged into the sea, but the treatment mode has great harm to the environment. The papermaking sludge is waste residue generated in each section in the papermaking process, and can be divided into the following steps according to different treatment processes: the sludge produced in the process of making paper by using logs or log pulp contains more fibers, fillers, ash content and the like, and is called as first-stage sludge; the activated sludge produced by the secondary biochemical treatment is characterized by high water content, strong hydrophilicity, low inorganic matter content and high micro organic matter content, and is called as secondary sludge; in the production section of secondary fiber recycling, sludge produced in the flotation deinking stage contains a large amount of ink, ash and various impurities, and is called deinking sludge. In recent years, the harmless treatment mode of papermaking pollutants is more and more emphasized by governments and enterprises. Survey data of the Chinese paper-making society shows that in 2019, the production enterprises of paper and paperboard in China are about 2700 families all year round, and the production capacity of the paper and paperboard in China reaches 10765 ten thousand tons, which is increased by 3.16 percent on year-on-year basis. The consumption of paper products reaches 170704 ten thousand tons, which is a 2.54% increase, meaning that 75 kilograms (14.00 million people) of paper are consumed per person per year. The paper product yield is huge, and simultaneously, a large amount of paper sludge is brought. The yield of the papermaking sludge in China is about 1500 ten thousand tons every year, which is equal to 5 to 10 times of that of a municipal sewage treatment plant with the same scale. Therefore, the method for recycling the paper-making sludge is explored, the storage amount of the sludge can be reduced, the environmental pollution is relieved, and the recycling of the paper-making sludge can be realized.
The invention discloses a preparation method of a sludge sintered self-insulation hollow building block, which comprises the steps of mechanically crushing and sieving sludge, uniformly mixing the crushed sludge and clay according to the proportion of 15. The method can utilize the sludge as resources, opens up the market for the sludge in the self-insulation building block, has good economic benefit and environmental benefit, but the production process needs high-temperature roasting and consumes a large amount of energy (patent number: CN 202111088460.0). Wumeng et al invented a method for preparing dry activated sludge adsorbent and sludge activated carbon adsorbent, which comprises the steps of carrying out suction filtration, drying, grinding and screening on activated sludge to obtain dry activated sludge adsorbent, and carrying out a series of steps of soaking, filtering, carbonizing, washing, drying, screening and the like to obtain sludge activated carbon adsorbent. The preparation method has high applicability, but has complex process flow and still has defects in the aspects of large-scale utilization and economic benefit improvement (patent No. CN 202210095427.9).
Disclosure of Invention
The invention aims to provide a method for preparing gypsum powder by using papermaking deinking sludge and application thereof. Aiming at the defects of the existing sludge utilization means, the method for preparing the gypsum powder by utilizing the deinked sludge is provided, the method has simple process steps and required equipment, can realize the resource utilization of the sludge, and can effectively relieve the problem of environmental pollution, and the prepared gypsum has excellent performance.
The purpose of the invention is realized by the following technical scheme:
a method for preparing gypsum powder by utilizing papermaking deinking sludge comprises the following steps:
1) Adding the pretreated papermaking deinking sludge powder into a crucible, and firing in a muffle furnace;
2) Adding a hydrochloric acid solution into the burned sludge to react to obtain a sludge solid-liquid mixture;
3) Purifying the sludge solid-liquid mixture to obtain a sludge hydrolysis solution, adding a reaction reagent into the sludge hydrolysis solution, and reacting to obtain gypsum precipitate;
4) Washing and drying the gypsum precipitate, and grinding to obtain the beta hemihydrate gypsum powder.
In the above method, in step 1), the preparation method of the pretreated deinking sludge powder for papermaking comprises the following steps: drying deinking sludge from paper mill in an oven at 100-110 deg.c (preferably 105 deg.c) to absolute dry, grinding the dried deinking sludge with a crusher, sieving with 50-100 mesh sieve and collecting sludge powder.
In the method, the ignition temperature of the muffle furnace is 300-700 ℃ (preferably 700 ℃), and the ignition heat preservation time is 2-4 h (preferably 4 h).
In the method, in the step 2), the molar concentration of the hydrochloric acid solution is 3 to 4mol/L, and preferably 4mol/L.
In the method, in the step 3), the purification procedure is to use a centrifuge to operate at 3500-4500 rpm for 10-20 min to separate the solid and liquid of the sludge solid-liquid mixture, and then obtain clear and transparent sludge hydrolysis solution by suction filtration.
In the method, the reaction reagent is analytically pure sodium sulfate.
In the method, the washing procedure is to wash and pump-filter the obtained gypsum precipitate by water, and the washing procedure is repeated for 1 to 4 times.
In the above method, in step 4), the drying procedure is: drying at 105 ℃ for 4-8 h until free water is completely removed to obtain dihydrate gypsum, and then drying at 120-140 ℃ for 4-8 h to obtain gypsum powder.
An application of preparing gypsum powder by utilizing papermaking deinking sludge comprises the following steps:
(1) Adding water into gypsum powder, stirring, pouring into a mould, and solidifying to obtain gypsum board;
(2) The formed gypsum board can be used as a building board.
Further, in the step (1), a modifying material is added, wherein the modifying material is citric acid or cellulose.
Further, the concentration of the citric acid in the water is 0.36g/L.
Further, the concentration of the cellulose in water is 0.28g/L.
Further, the building board comprises a wall panel or a ceiling.
Further, the mass ratio of the gypsum powder to the water is 1.2-1.4.
In the invention, after adding a proper amount of modified material and water, the beta-semi-hydrated gypsum is evenly stirred and poured into a mould, and a gypsum board is obtained after the beta-semi-hydrated gypsum is solidified. The prepared gypsum powder has ISO whiteness up to 81.24, CIE whiteness up to 78.56, maximum L value of L a b chromaticity space up to 92.7, minimum a value up to-0.03 and minimum b value up to 0.71. The density of the prepared gypsum can reach 1.24g/cm at most 3 The minimum density can reach 0.96g/cm 3 The bending strength can reach 2.43MPa at most, and the compression strength can reach 3.32MPa at most.
Compared with the prior art, the invention has the beneficial effects that:
1. the method for obtaining the gypsum is completely extracted from the deinked sludge, the conversion yield can reach more than 120 percent at most, the harm of the sludge to the environment can be reduced, and the sludge resource utilization is realized.
2. The brightness of the produced gypsum powder in L a b color space which can be perceived by human eyes can reach more than 92, and the a and b values are both lower than 2, the ISO whiteness is close to 80, and the gypsum powder meets the whiteness requirement of general building gypsum.
3. The gypsum board prepared from gypsum powder prepared from sludge has the maximum compressive strength of 3.32Mpa and the maximum bending strength of 2.49Mpa, has excellent performance, and can be applied to ceilings, partition boards, decorative boards and the like.
4. In the preparation process of the gypsum, the physical and chemical properties of the gypsum are changed by adding the modified material to adapt to different operating environments, so that the general applicability of the sludge-prepared gypsum is enhanced.
Drawings
FIG. 1 is a flow diagram of the preparation of landplaster using deinking sludge;
FIG. 2 is a chromaticity space diagram of Ramsonite;
fig. 3 is a chromaticity space diagram of laa b of the prepared gypsum powder;
FIG. 4 is a diagram of an example of gypsum precipitation;
FIG. 5 is an exemplary illustration of a sludge hydrolysis solution.
Detailed Description
The present invention is further illustrated by the following specific examples. The flow chart in this embodiment is shown in fig. 1.
Example 1
(1) Drying the deinked sludge in a 105 ℃ oven to be absolutely dry, crushing, sieving by a 60-mesh sieve, and collecting sludge powder;
(2) Taking a proper amount of deinked sludge powder in a crucible, and putting the crucible in a muffle furnace to be burned for 2 hours at 300 ℃;
(3) Adding 4mol/L hydrochloric acid into the burned sludge powder for reaction until no bubbles are generated to obtain a sludge solid-liquid mixture;
(4) Running the sludge solid-liquid mixture at 4500rpm for 10min by a centrifuge, separating the solution, and performing suction filtration to obtain sludge hydrolysis solution (the example diagram of the obtained sludge hydrolysis solution is shown in FIG. 5);
(5) Adding sodium sulfate into the hydrolysis solution, and analyzing until the hydrolysis solution completely reacts, and then generating no solid to obtain gypsum precipitate (the example graph of the obtained gypsum precipitate is shown in figure 4);
(6) Filtering the gypsum precipitate, washing with clear water for 4 times, and drying in an oven at 105 deg.C for 4 hr;
(7) Adjusting the oven temperature of the dried gypsum to 135 ℃, and continuously drying for 8 hours to obtain beta semi-hydrated gypsum;
(8) Grinding gypsum to obtain gypsum powder, and can be used for preparing building gypsum.
(9) The yield is the ratio of the weighed mass of the sludge to the prepared dihydrate gypsum, and the yield is 67.25 percent. The prepared landplaster was measured to have an ISO brightness of 81.03, a cie brightness of 78.56, a L value of 92.51 in the color space la value of-0.09 and a b value of 0.71.
(10) Mixing the obtained gypsum powder with water according to the mass ratio of 1.4, stirring uniformly, pouring into a mould for solidification to obtain a gypsum board with the density of 0.97g/cm -3 The bending strength is 2.45Mpa, and the compression strength is 3.32Mpa.
Example 2
(1) Drying the deinked sludge in a 100 ℃ oven to be absolutely dry, crushing, sieving by a 50-mesh sieve, and collecting sludge powder;
(2) Taking a proper amount of deinked sludge powder in a crucible, and putting the crucible in a muffle furnace to be burned for 3 hours at 500 ℃;
(3) Adding 3mol/L hydrochloric acid into the burnt sludge powder to react until no bubbles are generated to obtain a sludge solid-liquid mixture;
(4) Running the sludge solid-liquid mixture at 3500rpm for 20min by a centrifuge, separating out the solution, and performing suction filtration to obtain a sludge hydrolysis solution;
(5) Adding sodium sulfate into the hydrolysis solution for analytical purification until the hydrolysis solution completely reacts, and then generating no solid to obtain gypsum precipitate;
(6) Filtering the gypsum precipitate, washing with clear water for 3 times, and drying in an oven at 105 deg.C for 6 hr;
(7) Adjusting the oven temperature of the dried gypsum to 130 ℃ and continuously drying for 6h to obtain beta semi-hydrated gypsum;
(8) Grinding gypsum to obtain gypsum powder, which can be used for preparing building gypsum.
(9) The yield is the ratio of the weighed mass of the sludge to the prepared dihydrate gypsum, and the yield is 93.61 percent. The prepared landplaster was measured to have an ISO brightness of 80.92, a cie brightness of 77.99, a L value of 92.54 in the color space of la b, a value of-0.06 and a value of 0.85 in b.
(10) Mixing the obtained gypsum powder with water according to a mass ratio of 1.2, stirring uniformly, pouring into a mould for solidification to obtain a gypsum plate with a density of 0.98g/cm -3 The bending strength is 2.36MPa, and the compression strength is 3.29MPa.
Example 3
(1) Drying the deinked sludge in a drying oven at 110 ℃ to be completely dry, crushing, screening by a 100-mesh screen, and collecting sludge powder;
(2) Taking a proper amount of deinked sludge powder in a crucible, and putting the crucible in a muffle furnace to be burned for 4 hours at 700 ℃;
(3) Adding 3.5mol/L hydrochloric acid into the burned sludge powder for reaction until no bubbles exist to generate a sludge solid-liquid mixture;
(4) Running the sludge solid-liquid mixture at 3500rpm for 10min by a centrifuge, separating out the solution, and performing suction filtration to obtain a sludge hydrolysis solution;
(5) Adding sodium sulfate into the hydrolysis solution, and analyzing until the hydrolysis solution completely reacts, and generating no solid to obtain gypsum precipitate;
(6) Filtering the gypsum precipitate, washing with clear water for 1 time, and drying in an oven at 105 deg.C for 8 hr;
(7) Adjusting the oven temperature of the dried gypsum to 140 ℃ and continuously drying for 4h to obtain beta semi-hydrated gypsum;
(8) Grinding gypsum to obtain gypsum powder, and can be used for preparing building gypsum.
(9) The yield is the ratio of the weighed mass of the sludge to the prepared dihydrate gypsum, and the yield is 123.45 percent. The prepared landplaster was measured to have an ISO brightness of 79.93, a cie brightness of 74.21, a L value of 92.46 in the color space of la a b, a value of-0.11 and a b value of 1.62.
(10) Mixing the obtained Gypsum Fibrosum powder with water according to the mass of 1.3Proportionally mixing, stirring, pouring into mould, and solidifying to obtain gypsum board with density of 1.24g/cm -3 The bending strength is 1.12Mpa, and the compression strength is 1.16Mpa.
Example 4
(1) Drying the deinked sludge in a 105 ℃ oven to be absolutely dry, crushing, sieving by a 60-mesh sieve, and collecting sludge powder;
(2) Taking a proper amount of deinked sludge powder in a crucible, and putting the crucible in a muffle furnace to be burned for 3 hours at 300 ℃;
(3) Adding 4mol/L hydrochloric acid into the burnt sludge powder to react until no bubbles are generated to obtain a sludge solid-liquid mixture;
(4) Running the sludge solid-liquid mixture for 15min at 4000rpm through a centrifugal machine, separating out a solution, and performing suction filtration to obtain a sludge hydrolysis solution;
(5) Adding sodium sulfate into the hydrolysis solution, and analyzing until the hydrolysis solution completely reacts, and generating no solid to obtain gypsum precipitate;
(6) Filtering the gypsum precipitate, washing with clear water for 4 times, and drying in an oven at 105 deg.C for 4 hr;
(7) Adjusting the oven temperature of the dried gypsum to 135 ℃, and continuously drying for 8h to obtain beta semi-hydrated gypsum;
(8) Grinding gypsum to obtain gypsum powder, and can be used for preparing building gypsum.
(9) The yield is the ratio of the weighed mass of the sludge to the prepared dihydrate gypsum, and the yield is 67.13 percent. The prepared landplaster was found to have an ISO brightness of 81.05, a cie brightness of 78.08, a L value of 92.59, an a value of-0.06 and a b value of 0.85.
(10) Adding citric acid into water at a concentration of 0.36g/L, mixing the obtained Gypsum Fibrosum powder with water at a mass ratio of 1.2, stirring, pouring into a mold, and solidifying to obtain Gypsum board with a density of 1.10g/cm -3 The bending strength is 1.96Mpa, and the compression strength is 2.57Mpa.
Example 5
(1) Drying the deinked sludge in a 105 ℃ oven to be completely dry, crushing, sieving by a 60-mesh sieve, and collecting sludge powder;
(2) Taking a proper amount of deinked sludge powder in a crucible, and putting the crucible in a muffle furnace to be burned for 4 hours at 500 ℃;
(3) Adding 4mol/L hydrochloric acid into the burnt sludge powder to react until no bubbles are generated to obtain a sludge solid-liquid mixture;
(4) Running the sludge solid-liquid mixture for 10min at 4000rpm through a centrifugal machine, separating out a solution, and performing suction filtration to obtain a sludge hydrolysis solution;
(5) Adding sodium sulfate into the hydrolysis solution, and analyzing until the hydrolysis solution completely reacts, and generating no solid to obtain gypsum precipitate;
(6) Filtering the gypsum precipitate, washing with clear water for 3 times, and drying in an oven at 105 deg.C for 4h;
(7) Adjusting the oven temperature of the dried gypsum to 130 ℃ and continuously drying for 8h to obtain beta semi-hydrated gypsum;
(8) Grinding gypsum to obtain gypsum powder, and can be used for preparing building gypsum.
(9) The yield is the ratio of the weighed mass of the sludge to the prepared dihydrate gypsum, and the yield is 92.57 percent. The prepared landplaster was found to have an ISO brightness of 81.24, a cie brightness of 92.70, a L value of 78.25 in the la b color space, a value of-0.05 and a b value of 0.87.
(10) Adding citric acid into water at a concentration of 0.36g/L, mixing the obtained Gypsum Fibrosum powder with water at a mass ratio of 1.4, stirring, pouring into a mold, and solidifying to obtain Gypsum board with a density of 1.11g/cm -3 The bending strength is 2.03MPa, and the compression strength is 2.64MPa.
Example 6
(1) Drying the deinked sludge in a 105 ℃ oven to be completely dry, crushing, sieving by a 60-mesh sieve, and collecting sludge powder;
(2) Taking a proper amount of deinked sludge powder in a crucible, and putting the crucible in a muffle furnace to be burned for 2 hours at 700 ℃;
(3) Adding 4mol/L hydrochloric acid into the burnt sludge powder to react until no bubbles are generated to obtain a sludge solid-liquid mixture;
(4) Running the sludge solid-liquid mixture for 20min at 4500rpm by a centrifugal machine, separating out a solution, and performing suction filtration to obtain a sludge hydrolysis solution;
(5) Adding sodium sulfate into the hydrolysis solution for analytical purification until the hydrolysis solution completely reacts, and then generating no solid to obtain gypsum precipitate;
(6) Filtering the gypsum precipitate, washing with clear water for 1 time, and drying in an oven at 105 deg.C for 4 hr;
(7) Adjusting the oven temperature of the dried gypsum to 140 ℃ and continuously drying for 8h to obtain beta semi-hydrated gypsum;
(8) Grinding gypsum to obtain gypsum powder, which can be used for preparing building gypsum.
(9) The yield is the ratio of the weighed mass of the sludge to the prepared dihydrate gypsum, and the yield is 122.67 percent. The prepared landplaster was found to have an ISO brightness of 78.04, a cie brightness of 71.92, a L value of 91.66, an a value of-0.14 and a b value of 1.72 in the chromaticity space.
(10) Adding citric acid into water at concentration of 0.36g/L, mixing the obtained Gypsum Fibrosum powder with water at mass ratio of 1.4, stirring, pouring into mold, and solidifying to obtain Gypsum Fibrosum board with density of 1.19g/cm -3 The bending strength is 1.15Mpa, and the compression strength is 1.27Mpa.
Example 7
(1) Drying the deinked sludge in a 105 ℃ oven to be absolutely dry, crushing, sieving by a 60-mesh sieve, and collecting sludge powder;
(2) Taking a proper amount of deinked sludge powder in a crucible, and putting the crucible in a muffle furnace to be burned for 2 hours at 300 ℃;
(3) Adding 4mol/L hydrochloric acid into the burnt sludge powder to react until no bubbles are generated to obtain a sludge solid-liquid mixture;
(4) Running the sludge solid-liquid mixture for 20min at 4500rpm by a centrifugal machine, separating out a solution, and performing suction filtration to obtain a sludge hydrolysis solution;
(5) Adding sodium sulfate into the hydrolysis solution for analytical purification until the hydrolysis solution completely reacts, and then generating no solid to obtain gypsum precipitate;
(6) Filtering the gypsum precipitate, washing with clear water for 4 times, and drying in an oven at 105 deg.C for 4 hr;
(7) Adjusting the oven temperature of the dried gypsum to 140 ℃ and continuously drying for 6h to obtain beta semi-hydrated gypsum;
(8) Grinding gypsum to obtain gypsum powder, which can be used for preparing building gypsum.
(9) The yield is the ratio of the weighed mass of the sludge to the prepared dihydrate gypsum, and the yield is 68.37 percent. The prepared landplaster was measured to have an ISO brightness of 80.36, a cie brightness of 77.08, a L value in the color space of la b of 92.34, a value of-0.03 and b value of 0.95.
(10) Adding cellulose into water at concentration of 0.28g/L, mixing the obtained gypsum powder with water at mass ratio of 1.3, pouring into a mold, and solidifying to obtain gypsum board with density of 1.09g/cm -3 The bending strength is 2.49Mpa, and the compression strength is 3.27Mpa.
Example 8
(1) Drying the deinked sludge in a 105 ℃ oven to be completely dry, crushing, sieving by a 60-mesh sieve, and collecting sludge powder;
(2) Taking a proper amount of deinked sludge powder in a crucible, and putting the crucible in a muffle furnace to be burned for 2 hours at 500 ℃;
(3) Adding 4mol/L hydrochloric acid into the burnt sludge powder to react until no bubbles are generated to obtain a sludge solid-liquid mixture;
(4) Running the sludge solid-liquid mixture for 15min at 4500rpm through a centrifugal machine, separating out a solution, and performing suction filtration to obtain a sludge hydrolysis solution;
(5) Adding sodium sulfate into the hydrolysis solution for analytical purification until the hydrolysis solution completely reacts, and then generating no solid to obtain gypsum precipitate;
(6) Filtering the gypsum precipitate, washing with clear water for 3 times, and drying in an oven at 105 deg.C for 8 hr;
(7) Adjusting the oven temperature of the dried gypsum to 135 ℃, and continuously drying for 8h to obtain beta semi-hydrated gypsum;
(8) Grinding gypsum to obtain gypsum powder, and can be used for preparing building gypsum.
(9) The yield is the ratio of the weighed mass of the sludge to the prepared dihydrate gypsum, and the yield is 95.74 percent. The prepared landplaster was found to have an ISO brightness of 81.12, a cie brightness of 78.42, a L value of 92.27, an a value of-0.07 and a b value of 0.83 in the chromaticity space.
(10) Adding cellulose into water at concentration of 0.28g/L, mixing the obtained Gypsum Fibrosum powder with the above mixtureMixing water at a mass ratio of 1.2, pouring into a mold, and solidifying to obtain gypsum board with a density of 1.06g/cm -3 The bending strength is 2.13Mpa, and the compression strength is 2.86Mpa.
Example 9
(1) Drying the deinked sludge in a 105 ℃ oven to be absolutely dry, crushing, sieving by a 60-mesh sieve, and collecting sludge powder;
(2) Taking a proper amount of deinked sludge powder in a crucible, and putting the crucible in a muffle furnace to be burned for 2 hours at 700 ℃;
(3) Adding 4mol/L hydrochloric acid into the burnt sludge powder to react until no bubbles are generated to obtain a sludge solid-liquid mixture;
(4) Running the sludge solid-liquid mixture at 3500rpm for 10min by a centrifugal machine, separating out a solution, and performing suction filtration to obtain a sludge hydrolysis solution;
(5) Adding sodium sulfate into the hydrolysis solution, and analyzing until the hydrolysis solution completely reacts, and generating no solid to obtain gypsum precipitate;
(6) Filtering the gypsum precipitate, washing with clear water for 1 time, and drying in an oven at 105 deg.C for 6h;
(7) Adjusting the oven temperature of the dried gypsum to 135 ℃, and continuously drying for 6 hours to obtain beta semi-hydrated gypsum;
(8) Grinding gypsum to obtain gypsum powder, which can be used for preparing building gypsum.
(9) The yield is the ratio of the weighed mass of the sludge to the prepared dihydrate gypsum, and the yield is 119.89%. The prepared landplaster was measured to have an ISO brightness of 79.50, a cie brightness of 73.99, a L value of 92.38 in the color space la value of-0.11 and a b value of 1.67.
(10) Adding cellulose into water at concentration of 0.28g/L, mixing the obtained gypsum powder with water at mass ratio of 1.4, pouring into a mold, and solidifying to obtain gypsum board with density of 1.14g/cm -3 The bending strength is 0.98Mpa, and the compression strength is 1.26Mpa.
Comparative example 1
(1) Drying the deinked sludge in a 105 ℃ oven to be completely dry, crushing, sieving by a 60-mesh sieve, and collecting sludge powder;
(2) Taking a proper amount of deinked sludge powder in a crucible, and putting the crucible in a muffle furnace to be burned for 2 hours at 700 ℃;
(3) Adding 4mol/L hydrochloric acid into the burned sludge powder for reaction until no bubbles are generated to obtain a sludge solid-liquid mixture;
(4) Running the sludge solid-liquid mixture for 15min at 4000rpm through a centrifugal machine, separating out a solution, and performing suction filtration to obtain a sludge hydrolysis solution;
(5) Adding sodium sulfate into the hydrolysis solution, and analyzing until the hydrolysis solution completely reacts, and generating no solid to obtain gypsum precipitate;
(6) Filtering the gypsum precipitate, washing with clear water for 1 time, and drying in an oven at 105 deg.C for 4 hr;
(7) Adjusting the oven temperature of the dried gypsum to 120 ℃, and continuously drying for 8h to obtain beta semi-hydrated gypsum;
(8) Grinding gypsum to obtain gypsum powder, and can be used for preparing building gypsum.
(9) The yield is the ratio of the weighed mass of the sludge to the prepared dihydrate gypsum, and the yield is 118.82%. The prepared landplaster was measured to have an ISO brightness of 79.49, a cie brightness of 73.74, a L value in laa b color space of 92.28, a value of-0.13, and a value of 1.63 (its laa b color space plot is shown in fig. 2).
Comparative example 2
(1) Drying the deinked sludge in a 105 ℃ oven to be absolutely dry, crushing, sieving by a 60-mesh sieve, and collecting sludge powder;
(2) Taking a proper amount of deinked sludge powder in a crucible, and putting the crucible in a muffle furnace to be burned for 2 hours at 500 ℃;
(3) Adding 4mol/L hydrochloric acid into the burnt sludge powder to react until no bubbles are generated to obtain a sludge solid-liquid mixture;
(4) Running the sludge solid-liquid mixture for 20min at 4500rpm by a centrifugal machine, separating out a solution, and performing suction filtration to obtain a sludge hydrolysis solution;
(5) Adding sodium sulfate into the hydrolysis solution, and analyzing until the hydrolysis solution completely reacts, and generating no solid to obtain gypsum precipitate;
(6) Filtering the gypsum precipitate, washing with clear water for 4 times, and drying in an oven at 105 deg.C for 4 hr;
(7) Adjusting the oven temperature of the dried gypsum to 120 ℃, and continuously drying for 8 hours to obtain beta semi-hydrated gypsum;
(8) Grinding gypsum to obtain gypsum powder, and can be used for preparing building gypsum.
(9) The yield is the ratio of the weighed mass of the sludge to the prepared dihydrate gypsum, and the yield is 96.19 percent. The prepared landplaster was measured to have an ISO brightness of 80.93, a cie brightness of 78.10, a L value of 92.55 in the la-0.05 in the b-color space, and a L value of 0.83 in the la-b color space (the la-b color space is shown in fig. 3).
The foregoing is only a preferred embodiment of the present invention, and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the present invention, and these modifications should also be construed as the protection scope of the present invention.
Claims (10)
1. A method for preparing gypsum powder by utilizing papermaking deinking sludge is characterized by comprising the following steps:
1) Adding the pretreated paper-making deinking sludge powder into a muffle furnace for firing;
2) Adding a hydrochloric acid solution into the burned sludge to react to obtain a sludge solid-liquid mixture;
3) Purifying the sludge solid-liquid mixture to obtain a sludge hydrolysis solution, adding a reaction reagent into the sludge hydrolysis solution to react to obtain gypsum precipitate;
4) Washing and drying the gypsum precipitate, and grinding to obtain the beta hemihydrate gypsum powder.
2. The method for preparing gypsum powder by using paper-making deinking sludge according to claim 1, wherein the preparation method of the pretreated paper-making deinking sludge powder in the step 1) comprises the following steps: drying deinking sludge of a paper mill in an oven at 100-110 ℃ to be absolutely dry, grinding the dried deinking sludge of the paper mill by using a crusher, sieving the deinking sludge by using a 50-100-mesh sieve, and collecting sludge powder;
the burning temperature of the muffle furnace is 300-700 ℃, and the burning heat preservation time is 2-4 h.
3. The method for preparing gypsum powder by using paper deinking sludge as claimed in claim 1, wherein the molar concentration of the hydrochloric acid solution in the step 2) is 3 to 4mol/L.
4. The method for preparing gypsum powder by using paper-making deinking sludge according to claim 1, wherein in the step 3), the purification procedure comprises the steps of operating a centrifuge at 3500-4500 rpm for 10-20 min to separate solid and liquid of the sludge solid-liquid mixture, and performing suction filtration to obtain a clear and transparent sludge hydrolysis solution;
the reaction reagent is sodium sulfate analytically pure;
the washing procedure is to wash and pump-filter the obtained gypsum precipitate with water, and repeat the washing procedure for 1-4 times.
5. The method for preparing gypsum powder by using paper-making deinking sludge as claimed in claim 1, wherein in the step 4), the drying procedure is as follows: drying at 105 ℃ for 4-8 h until free water is completely removed to obtain dihydrate gypsum, and then drying at 120-140 ℃ for 4-8 h to obtain gypsum powder.
6. The application of the preparation method of any one of claims 1 to 5 in preparing gypsum powder by using paper-making deinking sludge, which is characterized by comprising the following steps of:
(1) Adding water into gypsum powder, stirring, pouring into a mould, and solidifying to obtain gypsum board;
(2) The formed gypsum board can be used as a building board.
7. The use of claim 6, wherein in step (1), a modifying material is further added, and the modifying material is citric acid or cellulose.
8. The use according to claim 7, wherein the citric acid is present in water at a concentration of 0.36g/L;
the concentration of the cellulose in water was 0.28g/L.
9. The use of claim 6, wherein the building board comprises a wall panel or a ceiling panel.
10. The use of claim 6, wherein the mass ratio of the gypsum powder to the water is 1.2-1.4.
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