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DESCRIPTION JPS5146317

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DESCRIPTION JPS5146317
L name of the inventor 2, inventor 0 naki Vffi 77 end 1z Yamae address 278 2 in front of the
middle eating place in Amagasaki-shi Hyogo Prefecture, patent applicant address Nishinomiyashi gate No. 15 11 11 [phase] Japan Japanese Patent Office 0, Japanese Patent Application LaidOpen No. 51-4631-70, Japanese Patent Application No. 51. (1976) 4.20 ρ / 0 / specification 1,
name of the invention asbestos cement board manufacturing method 1, name of the invention
asbestos cement board manufacturing method
W 'Y' W (7) "H 'l'k' 15 '
3. Detailed Description of the Invention The present invention relates to a method of producing
asbestos-cement boards, and in particular, to the production of asbestos-cement boards which
can effectively utilize wastes such as waste water treatment sludge of asbestos cement plants and
cutting powder and chips of asbestos cement products. It is intended to provide a method.
Generally, when asbestos-cement board is manufactured by a wet method, asbestos is scrapped
with a layering machine 1a and fed to the mixer 2 as shown in FIG. At this time, cement 3 and
pulp powder 4 and mineral powder 4 are simultaneously introduced into mixer 2 and mixed. To
the asbestos-cement mixture thus obtained, a large amount of water 5 of 5 to 20 times is added
and mixed in a mixer 6, and then thoroughly mixed in a chest 6a to form an asbestos cement
slurry 7. Next, the asbestos-cement slurry 7 is put into a round mesh type paper making machine
8. Then, the asbestos-cement slurry is dewatered and filtered with a wire mesh (not shown) of
about 0, 25 to 0.5 inch stretched on the rotary cylindrical frame 8a of the paper-making machine
8 to remove sand as asbestos-cement thin film. Next, the asbestos-cement thin film is transferred
to an endless blanket belt 9 which is moved in contact with the cylindrical frame 8a, dewatered
by a suction pump 9a during the transfer of the belt 9, and until the winding roll 10 becomes a
predetermined inner thickness. Take up. Then, the asbestos-cement layer having a predetermined
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thickness wound on the winding roll 10 is cut in the axial direction of the roll and taken out from
the winding roll 10 to make a green sheet 11. Next, a plurality of the green plates 11 are stacked,
pressure-formed, and then cured to form a product. EndPage: 1 in the wet production of
asbestos-cement boards mentioned above aims to reduce wastes, such as waste water treatment
sludge of asbestos-cement boards production plant and asbestos-cement board cutting powder
scraps, for the purpose of reduction of production cost and effective utilization of plant waste. It
mixes with cement slurry. However, the solid particles mixed in the above-mentioned waste are
various from relatively large ones to very fine ones, and the particle size distribution is extremely
wide. Therefore, when such waste is mixed in an asbestos cement slurry, the asbestos cement
slurry 7 is formed into an asbestos cement thin film with a wire mesh stretched over the
cylindrical frame 8a of the paper making machine 8, and still transferred to the blanket belt 9
When the cement thin film is dewatered by the suction pump 9a, the fine mesh mixed in the
waste causes the wire mesh and the blanket belt 9 to be clogged, which adversely affects the
papermaking operation and the characteristics of the product. The present invention aggregates
fine particles mixed in the waste by adding the anionic polymer flocculant together with the
waste when mixing the above-mentioned waste into the asbestos cement slurry, and a wire mesh
by these fine particles And blanket belts to prevent clogging, thereby enabling industrial use of
asbestos-cement slurry mixed with waste. When producing asbestos-cement boards by the wet
method, waste-water treatment sludge of asbestos cement plant in asbestos cement slurry
Alternatively, waste materials such as asbestos cement product cut powder layers are mixed with
an anionic polymer flocculant, and then this waste mixed asbestos cement slurry is formed into
an asbestos cement thin film.
W 'Y' W (7) "H 'l'k' 15 '
Hereinafter, the present invention will be described in detail based on experimental results. Test
results 1 Composition of asbestos-cement mixture 14.0 wt% asbestos 39.5 wt% cement 39.5 wt%
silica sand powder 39.5 wt% in total 100.0 20 volumes of asbestos-cement blend of the above
composition (2) (3) Water was added and mixed to prepare an asbestos cement slurry. The
asbestos cement slurry was filtered through a 0.25 Wn wire mesh and ordinary filter paper, and
the solid content concentration of the filtered water was measured, to be 0.4 wt%. Using this
asbestos-cement slurry, an asbestos-cement board with a thickness of 4.9 to 5.5 rrvn was
manufactured by the method described in FIG. The flexural strength of the obtained asbestoscement board was 189 "i /, H. Experimental result 2 Asbestos cement slurry containing 5% by
weight of asbestos cement factory waste water treated sludge (solid content 50% by weight)
mixed with 5% by weight of asbestos cement slurry is filtered in the same manner as in the case
of experimental result 1; The solid concentration is 0.57% by weight, which indicates that fine
particles are present in the waste water treated sludge -C. It is obvious that if used as it is
industrially, gauze occurs in the wire mesh and blanket belt, but using this asbestos-cement
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slurry, asbestos-cement board is manufactured as in the case of experimental result 1, asbestoscement 1,・ When the bending strength of the plate is measured, the bending strength is 180K9
/ per-second, and the bending strength is lower than in the case of the experiment where no
sludge is mixed. . Experimental Result 3 In the case of Experimental Result 2, an anionic polymer
flocculant (polyacrylamide) equivalent to 0.5% by weight was mixed with the sludge. The
asbestos-cement slurry thus obtained was filtered in the same manner as in the experimental
result 1. As a result, the solid content concentration of the filtered water was 0.20% by weight,
which was a usable value. Using this asbestos-cement slurry, an asbestos-cement board is
produced in the same manner as in experimental result 1, and its flexural strength is measured to
be 200 to / d. The flexural strength is improved more than in experimental result 1. There is.
Experimental Result 4 In the case of Experimental Result 2, the solid content concentration of the
filtered water of asbestos cement slurry in which the mixing amount of waste water treated
sludge (solid content 50% by weight) is 10% by weight is 0.6% by weight, Although it is clear that
using this as it is in EndPage: 2 industry has the same disadvantages as in the case of
experimental result 2, asbestos cement as in the case of experimental result using this asbestos
cement slurry. When a plate was manufactured and its bending strength was measured, it was
168%, and a reduction in strength was apparent.
Experiment result 5 Asbestos cement slurry (0.5% by weight of anionic polymer flocculant
(polyacrylamide) added to the asbestos cement slurry (mixed with 10% by weight of sludge) of
Experiment result 4 is the same as the case of Experiment result 1 The solid content
concentration of the filtered water was 0.25% by weight, indicating an industrially usable value.
When an asbestos-cement board was produced using this asbestos-cement slurry weir in the
same manner as in the experimental result 1 and the flexural strength was measured, it was 185,
which was equivalent to the experimental result 1. (7) The experimental results 1 to 5 are
collectively displayed in the following table. Table Experiment Results Waste Addition Amount
Flocculant Bending Strength (as Solid Content) Addition Amount Solid Content Concentration
(Wt%) (Wt%) (Immediate / d) (Wt%) 1---1890.422 2.5 -180'0.5732.50.52000.2045.0-1680.60!
According to the method of the present invention, wastes such as waste water treatment sludge
of asbestos cement plant or cut powder of asbestos cement products according to the method of
the present invention It is possible to mix and effectively utilize these wastes. Furthermore, there
is no deterioration in product characteristics even if waste is used in combination, but rather
improvement in product strength is obtained. & 1 List of documents attached (1) specification (1)
(2) drawing 1 leaf (3) request duplicate 1 (4) Power of attorney 1 other than the above inventor's
address Hyogo prefecture = "17y-= rK 2nd address 6 address Nishi Yoshiharu EndPage: 3
procedure correction document (method) February 2 1975 patent Director General Hideo Saito
1. · ゝ 1, display of the case 1974 wishes of holding hand No. 2 0042 2 name of the invention
asbestos cement board manufacturing method 3, the person who makes corrections Hyogo =
"17y-= rK 2nd street 6 address full name Yoshiharu Nishii EndPage: 3 Procedure Amendment
(Formula) February 2, 1975 No. 2 Patent Office Secretary Hideo Saito 1. · ゝ 1, display of the
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case 1974 wishes of patent application No. 2 0042 2 name of the invention asbestos-cement
board manufacturing method 3, related persons with the correction case Patent applicant
address Nande district 2 Nande, Naniwa-ku, Osaka Address name (105) ′ '? Representative of
Representative Director, President and Representative Director, President, Qing Qing Tae 4,
Agent 〒 6625, Date of correction order January 11, 1959 (Delivery date January 28, 50) 内容
Contents of correction (1) Description 8 Next to page 19 (ie, the end), insert the following
sentence. ・
「4. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view of a wet
manufacturing method of asbestos-cement board. In the figure, Yu is asbestos, Yu is a layering
machine, 2 is a mixer, 3 is cement, 4 is pulp powder and mineral powder, 5 is water, 6 is a mixer,
6a is a chest, and 7 is an asbestos cement slurry. 8 is a round mesh type paper-making machine,
8a is a rotating cylindrical frame of the paper-making machine 8, 9 is an endless blanket belt, 9a
is a suction pump, 10 is a winding roll, and 1 is an asbestos-cement raw blank. 」
2−EndPage: 4
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