Desulphurized gypsum refers to the by-products or by-products generated by chemical reactions in industrial production, involving tens of thousands of enterprises in chemical, electric power, metallurgy, agriculture and other fields, and is one of the eight major industrial solid waste。Limestone-gypsum (wet) desulphurization process is the most widely used and mature desulphurization technology in the world, and the desulphurization efficiency can reach more than 95%。However, this desulfurization process can effectively reduce the pollution of sulfur cure, but also produce a lot of industrial waste - desulfurization gypsum。This high grade, calcium sulfate dihydrate (CaSO4·2H2O) content of more than 90% of the industrial by-products, before the secondary processing, is only a high water content of industrial semi-finished products, a large number of stacked, both occupied land, but also a waste of resources, restricting the development of wet flue gas desulfurization technology。

Therefore, under the promotion of circular economy, according to the characteristics of industrial by-product gypsum, using it as a raw material to produce high-quality gypsum has become an effective way to solve the problem of desulfurization slag stacking, thus achieving a gorgeous turn from industrial waste to building materials upstarts。At present, the world mainly uses industrial by-product gypsum for the production of gypsum blocks, paper gypsum board, putty gypsum, plaster gypsum, high strength gypsum, cement retarder and so on。Today we will take a detailed look at the application of industrial by-product gypsum on paper gypsum board and the relevant skills of purchasing paper gypsum board!

First, industrial by-product gypsum inThe main application of gypsum building materials

Gypsum building materials with desulphurized gypsum as the main raw material is a multi-functional air-set cementative material, which is made of dihydrate gypsum (CaSO4·2H2O) through dehydration at different temperatures and pressures。Gypsum building materials production energy consumption is low, the products have the advantages of light weight, fire prevention, sound insulation, adjustable indoor air humidity, convenient construction, no harmful gas release during long-term use, is a typical "green building materials"。One of the main applications of gypsum building materials is paper gypsum board。Paper gypsum board is a lightweight building sheet made by mixing, forming, solidifying, cutting, drying and trimming with building gypsum and veneer board as the main raw materials, adding appropriate amount of fiber, starch, coagulant, blowing agent and water。It can be widely used in various industrial buildings and civil buildings, especially in high-rise buildings, and can be used as interior wall materials and decorative decoration materials。It has the advantages of light weight, fire prevention, earthquake resistance, heat preservation and heat insulation, good processing performance, convenient construction, good disassembly performance, good decorative effect, and increasing the use area。

二、How to choose high-quality paper gypsum board

1, the difference between the protective paper

The high-quality drywall is importedRaw wood pulp paperThis paper is light and thin, high strength, smooth surface, no stains, long fiber, good toughness。Poor quality paper gypsum board is produced by domestic recycled pulp paper, heavier and thicker, poor strength, rough surface, from the surface of gypsum board can sometimes see oil spots, easy to crack。Because more than 70% of the strength of paper gypsum board comes from the paper surface, paper is a key factor to ensure the strength of gypsum board。In addition, the quality of the paper also directly affects the surface of the gypsum boardDecorative property。Good paper gypsum board surface can be directly painted, poor paper gypsum board surface must be done after a full batch of decoration。

　2、Gypsum coreThe difference in material selection

Of high qualityDrywall on paperChoose high purityGypsum mineAs the raw material of the core material, the inferior paper gypsum board is the raw material纯度Lack of control。Low purity gypsum mine contains a lot of harmful substances, these harmful substances will greatly affect the performance of gypsum board。From the appearance, it can be seen that the board core of good paper gypsum board is white, and the poor paper gypsum board core is yellow (containing clay)。

3、Paper surface bonding

用Paper cutterScore it on the surface of the drywall45度角The "fork", and then open the paper surface at the crossing place, you can find that the high-quality paper gypsum board is still well glued to the gypsum core, and the gypsum core body is not exposed;The inferior gypsum board paper can tear off most or even all of the paper, and the gypsum core is completely exposed。

(The figure above is Shiyu gypsum board after tearing the paper surface, gypsum core body is not exposed)

4. Weight per unit area

The same thickness of the paper gypsum board, the high-quality board is generally lighter than the inferior。This is due to the different levels of production technology caused by poor quality gypsum board in some equipment obsolete process backward factory production, in this production conditions to produce light quality products is bound to cause a decline in strength, if you want to achieve the required strength, you must maintain a certain weight。However, at the same time as the weight is increased, the gypsum board has higher requirements for the strength of the weight of the gypsum board, so the product with light weight but strength that can meet the standard is the choice。

(Shiyu gypsum board production line on-site shooting)

　5、纵向/Transverse fracture强度

Since most of the strength of the paper gypsum board comes from the paper surface, and the paper surface has the direction of fiber distribution, the horizontal and horizontal values of the paper gypsum boardLongitudinal fractureThe intensity is not the same。The longitudinal/transverse fracture load of the paper gypsum board must meet the requirements of the standard GB/T9775-1999。You can view the test report provided by the manufacturer。

(Shiyu Gypsum board test Report)

From "industrial by-product" to "new building materials", Shiyu Building Materials has realized the "transformation of waste into treasure" of industrial by-product gypsum, providing new technologies and new ideas for industrialization, resource utilization and value solution of industrial by-product gypsum, and promoting the high-quality development of the whole local chemical industry chain。  The company always takes the environmental protection concept of "practicing circular economy and developing green building materials", focuses on the characteristics of "easy to use and durable", and explores the unlimited potential of high-end gypsum board, which is also your trustworthy and choice brand。