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Reutilization process for painting and coating pigment pf paper mill

A technology of paper mills and pigments, applied in the field of industrial solid waste recycling process, to achieve the effect of protecting the ecological environment, simple process steps, and realizing resource regeneration

Inactive Publication Date: 2009-02-18
北京盖雅技术中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The process of recycling, processing and reusing coating pigments in paper mills has not been reported at home and abroad

Method used

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  • Reutilization process for painting and coating pigment pf paper mill
  • Reutilization process for painting and coating pigment pf paper mill

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Coating wastewater from a large paper mill enters the flocculation tank. First, add polyaluminum silicate (self-made) at a dosage of 0.35‰ and stir rapidly for 10 minutes, then add nonionic polyacrylamide at a dosage of 0.2‰, and then stir at a slow speed for 30 minutes; plate sedimentation tank for sedimentation, reuse the supernatant, and oxidize the precipitated sludge; first add sodium hydroxide to adjust the pH value to 11, then add 5% sodium hypochlorite, stir at room temperature for 2 hours to fully oxidize; after oxidation, enter the turbine centrifuge machine for dehydration; the pigment recovered after oxidation and industrial grade calcium carbonate (400 mesh) are entered into a vertical grinder according to the proportioning ratio of 5%, and ground for 27min, the slurry particle diameter≤2μm% is 65.4%, the slurry solid content is 73.9%, ISO Whiteness 92.4%. The quality of the obtained product was verified by the coating test, and the physical properties of t...

Embodiment 2

[0022] Coating wastewater from a large paper mill enters the flocculation tank. First, add polyaluminum silicate (self-made) at a dose of 0.5‰ and stir quickly for 10 minutes, then add non-ionic polyacrylamide at a dose of 0.25‰, and stir at a slow speed for 45 minutes; plate sedimentation tank for sedimentation, reuse the supernatant, and oxidize the precipitated sludge; first add sodium hydroxide to adjust the pH value to 11, then add 10% sodium hypochlorite, stir at room temperature for 2 hours to fully oxidize; after oxidation, enter the turbine centrifuge Machine dehydration; the pigment reclaimed after oxidation and industrial grade calcium carbonate (400 mesh) enter vertical grinder by proportioning 10%, grind 26min, slurry particle diameter≤2μm% is 64.8%, slurry solid content 73.3%, ISO Whiteness 92.3%. The quality of the obtained product was verified by the coating test, and the physical properties of the paper are shown in Table 1.

Embodiment 3

[0024] Coating wastewater from a large paper mill enters the flocculation tank. First, add polyaluminum silicate (self-made) at a dose of 0.5‰ and stir quickly for 10 minutes, then add non-ionic polyacrylamide at a dose of 0.25‰, and stir at a slow speed for 45 minutes; plate sedimentation tank for sedimentation, reuse the supernatant, and oxidize the precipitated sludge; first add sodium hydroxide to adjust the pH value to 11, then add 10% sodium hypochlorite, stir at room temperature for 2 hours to fully oxidize; after oxidation, enter the turbine centrifuge Machine dehydration; the pigment reclaimed after oxidation and industrial grade calcium carbonate (400 mesh) enter vertical grinder by proportioning 15%, grind 26min, slurry particle diameter≤2μm% is 65.3%, slurry solid content 73.5%, ISO Whiteness 92.1%. The quality of the obtained product was verified by the coating test, and the physical properties of the paper are shown in Table 1.

[0025] Table 1 Paper physical pr...

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PUM

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Abstract

The invention provides a process of recovering and treating the paper mill coating pigment and the secondary use as the coating pigment. The process comprises flocculating, inclined lamellar precipitation, oxidation and viscosity reduction, turbine centrifugation and vertical foundry mill. The treatment object is the paper mill coating wastewater. The step of the process is simple, and the process can not generate the secondary pollution. The quality of the products passes the coating tests and the paper reaches the related standards of the enterprise. The process is a novel technology with environmental benefit, economic benefit and social benefit.

Description

Technical field: [0001] The invention relates to a recycling process of industrial solid waste, in particular to a process for recycling, processing and reusing coating pigments in paper mills. technical background: [0002] In recent years, due to the expansion of the scale of my country's papermaking industry, tens of millions of tons of sludge are produced in the process of papermaking and papermaking wastewater treatment every year, which poses a huge challenge to environmental protection. With the development of secondary fiber recycling technology in paper mills, the proportion of inorganic fillers and pigments in papermaking sludge has increased from 10-20% to 30-40%, so it is necessary to recycle them. Japan Nippon Paper Industry Co., Ltd. has successfully developed a method of using papermaking sludge to produce fillers, which mainly includes: molding, drying, carbonization, calcination and crushing. British ECC International Company invented the technology of two-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/72C02F1/52C02F11/12C02F103/28
Inventor 吴绍祖倪晋仁何霄嘉周国辉柳铁矛邹鹏于亮
Owner 北京盖雅技术中心有限公司
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