CN100457410C

CN100457410C - Method for producing paper gypsum board using desulfurated gypsum and ardealite

Info

Publication number: CN100457410C
Application number: CNB2006100422051A
Authority: CN
Inventors: 贾同春; 曹志强; 孙善锟; 任绪连; 段振涛
Original assignee: SHANDONG TAIHE DONGXIN CO Ltd
Current assignee: SHANDONG TAIHE DONGXIN CO Ltd
Priority date: 2006-01-23
Filing date: 2006-01-23
Publication date: 2009-02-04
Anticipated expiration: 2026-01-23
Also published as: CN1803427A

Abstract

The invention discloses a making method of paper plaster board, which comprises the following steps: mixing the phosphogypsum and desulfuration plaster according to the weight ratio at 50-90:50-10; drying until the free water content under 5 percent; sintering the plaster at 160-220 DEG C continually to form the calcined gypsum powder with 5-9 percent crystal water; cooling in the bin; placing to obtain the architecture plaster powder; stirring the plaster powder with white corn starch latex, foaming agent, glass fiber and water evenly into material paste; compounding the roof and bottom of paper plaster board through plate-typed molder. The invention saves the natural plaster resource and cost, which improves the product property.

Description

Utilize desulfurated plaster and ardealite to produce the method for Thistle board

Technical field

The invention belongs to building and ornament materials, relate in particular to Thistle board.

Background technology

In the production of agriculture phosphate fertilizer, the ardealite that the annual discharging of China is 3,000 ten thousand tons takies a large amount of soils and deposits, and can cause second environmental pollution.Desulfurizer has produced a large amount of desulfurated plasters again in coal-fired thermal power factory flue gas desulfurization technique.About 4,000,000 tons of the annual discharge capacity of power plant's wet desulphurization gypsum, expectation in 2006 will reach more than 1,000 ten thousand tons.Ardealite and desulfurated plaster are referred to as industry by-product gypsum, and its chemical analysis is CaSO ₄2H ₂O, content is up to 90%.These industrial width of cloth produce gypsum and are mainly used in cement doping agent, building building-block, brushing gypsum powder etc. at present.A large amount of being not used still arranged.Be sought after developing a kind of new product and use these industrial residues in a large number.

The present domestic same industry is used to produce the Thistle board plaster of Paris and mainly adopts the plaster of paris, because the finiteness of plaster of paris resource, its price raises gradually, make the cost of Thistle board corresponding more and more higher, in order to reduce the cost of Thistle board, in the plaster of paris a certain amount of ardealite of admixture or desulfurated plaster are also arranged, but not separately with ardealite or desulfurated plaster.This is because impurity content height, the kind of ardealite is many, is acid, and unstable properties is used the ardealite instead plaster of paris separately, plasterboard plate face can occur with plate core adhesive property is not strong, water requirement shakiness, the bad phenomenon that grow setting time; And desulfurated plaster impurity content is low comparatively speaking, kind is few, neutral meta-alkalescence, performance is comparatively stable.Use desulfurated plaster to replace the plaster of paris separately, because its grain composition is bad, the distribution of particles band is very narrow, and grating is worse than the land plaster of the plaster of paris after levigate far away, make building gypsum plaster after intensity low, cause its mobile performance bad simultaneously, as producing Thistle board, be difficult to control conveying, metering, the feeding performance of its dry powder on the one hand, after adding water on the other hand and stirring with it, problems such as it is irregular to be easy to generate the interior foaming of plate, and plate core and mask paper caking property are not firm.

Summary of the invention

The purpose of this invention is to provide a kind of Thistle board that utilizes industrial by-product ardealite and desulfurated plaster to replace the plaster of paris to produce

Thistle board of the present invention adopts following steps:

1, gesso produces.

(1) ardealite and desulfurated plaster are entered batcher by weight the proportional quantity of 50-90: 50-10, be transported in the drum-type rotary drying machine by the hot-blast stove heat supply by batcher, mix that on 80-150 ℃ temperature range inner edge oven dry limit the free water content in the material is controlled at below 5%;

(2),, contain the plaster of paris of crystallization water 5-9% until formation through 160-220 ℃ of continuous calcining with sending into hot flue gas fluidized bed furnace behind the above-mentioned material screening again;

(3) obtain plaster of Paris through cooling warehouse-in, ageing, be used to produce plasterboard.

2, join slurry: the powder that ageing is good is sent into mixer through accurate weighing 100 weight portions of belted electronic balance, and cornstarch, the white glue with vinyl of 6-9 weight portion, the blowing agent of 7-10 weight portion, the glass fibre of 4-8 weight portion and the water of 60-80 weight portion of adding 6--7 weight portion evenly stir into slip;

3, making sheet: slip is sent into the bonding plasterboard type just that becomes of mask paper of board-like make-up machine and top, bottom surface, through solidifying belt feeder coagulation forming in conveying; The plasterboard of cutting machine after with moulding cut by certain specification, send into drying machine oven dry (bake out temperature 260-300 ℃) by dispenser again, dry good plasterboard is through master operations such as go-on-go, side cut, automatic edge sealing, stacking, packings, through the quality inspection warehousing after passing.

Good effect of the present invention is:

1, adopt industry by-product gypsum to produce Thistle board, industrial residue was utilized in a large number, saved the mineral resources of natural gypsum again, the cost of plasterboard also reduces greatly.

2, both are combined into raw material and produce building gypsum plaster and produce plasterboard to utilize ardealite, desulfurated plaster, can overcome independent use ardealite or desulfurated plaster and produce the shortcoming of Thistle board: after ardealite and desulfurated plaster are used in combination, on the soda acid degree, obtain neutralization, approaching with the plaster of paris, avoid occurring not sticking paper phenomenon; On Impurity Distribution, the use of desulfurated plaster can remedy ardealite impurity with respect to more characteristic; Can remedy mutually on the grain composition, reduce unit weight, prevent the appearance of lamination of emanating, thus improved finished product intensity, shortened setting time, strengthened sticking paper performance and foam performance.

3, owing to adopted hot blast revolution drying technology, under the effect of industry by-product gypsum lifting blade device in the turn-around machine cylinder, fully kicked up and pulverized, material is heated evenly, avoided limit wall powder burn-off phenomenon, improve the utilization rate of drying effect and heat energy, had oven dry even, dewater fast, high, the characteristic of low energy consumption of output.

4, owing to adopted hot flue gas fluidized bed furnace to calcine, it is more economized than fluidized bed furnace investment in the past, move more energy-conservation, more convenient operation.

Description of drawings

Fig. 1 is a process chart of the present invention.

The specific embodiment

Below in conjunction with accompanying drawing technical scheme of the present invention is further described.

1,70 parts of ardealites, the desulfurated plaster of standby industry by-product gypsum are sent into batcher for 30 parts by weight ratio, be transported in the drum-type rotary drying machine by the hot-blast stove heat supply by batcher and dry, bake out temperature is controlled at 100 ℃, mix while drying, when the free moisture in the compound 5% when following, send into feed bin through belt feeder and elevator;

2, send into hot flue gas fluidized bed furnace after the material in the feed bin is sieved, carry out continuous calcining, when the crystallization water in the compound reduces to 8%, send into the cooling of powder storehouse, ageing through belt feeder at 200 ℃;

3, ageing is good powder is sent into mixer through accurate weighing 100 weight portions of belted electronic balance, and adds the cornstarch of 6 weight portions, the white glue with vinyl of 7 weight portions, the blowing agent of 8 weight portions, the glass fibre of 6 weight portions and the water of 70 weight portions and evenly stir into slip;

4, slip is sent into the bonding plasterboard type just that becomes of mask paper of board-like make-up machine and top, bottom surface, through solidifying belt feeder coagulation forming in conveying, the plasterboard of cutting machine after with moulding cut by certain specification, send into drying machine oven dry (280 ℃ of bake out temperatures) by dispenser again, dry good plasterboard is through master operations such as go-on-go, side cut, automatic edge sealing, stacking, packings, through the quality inspection warehousing after passing.

Claims

1, a kind of Thistle board that utilizes desulfurated plaster and ardealite to produce, it comprises powder process, joins slurry, the making sheet three process, it is characterized in that its concrete manufacturing process is as follows:

(1) gesso produces

1. ardealite and desulfurated plaster are entered batcher by weight the proportional quantity of 50-90: 50-10, be transported in the drum-type rotary drying machine by the hot-blast stove heat supply by batcher, mix that on 80-150 ℃ temperature range inner edge oven dry limit the free water content in the material is controlled at below 5%;

2. with sending into hot flue gas fluidized bed furnace behind the above-mentioned material screening again,, contain the plaster of paris of crystallization water 5-9% until formation through 160-220 ℃ of continuous calcining;

3. obtain plaster of Paris through cooling warehouse-in, ageing, be used to produce plasterboard;

(2) join slurry: the powder that ageing is good is sent into mixer through accurate weighing 100 weight portions of belted electronic balance, and cornstarch, the white glue with vinyl of 6-9 weight portion, the blowing agent of 7-10 weight portion, the glass fibre of 4-8 weight portion and the water of 60-80 weight portion of adding 6--7 weight portion evenly stir into slip;

(3) making sheet: slip is sent into the bonding plasterboard type just that becomes of mask paper of board-like make-up machine and top, bottom surface, through solidifying belt feeder coagulation forming in conveying; The plasterboard of cutting machine after with moulding cut by certain specification, sends into the drying machine oven dry by dispenser again, and bake out temperature 260-300 ℃, dry good plasterboard is through go-on-go, side cut, automatic edge sealing, stacking, packing warehouse-in.