Pre Painted Galvanized Sheet

1, The specific factors affecting the recovery value of the pre painted galvanized sheet are not the same for all the pre painted galvanized sheet, mainly affected by the following factors:

Type and thickness of base plate of pre painted galvanized sheet ：recycling value of aluminized zinc base plate is generally slightly higher than that of galvanized base plate. The thicker the base plate, the higher the unit weight, and naturally the higher the value.

Coating type and state of pre painted galvanized sheet:

·Ordinary PE/PET pre painted galvanized sheet: it is the most mainstream and the most mature recycling technology at present. The recycling plant has mature processing technology (organic coating will be burned out in high temperature smelting).

·PVDF coating of pre painted galvanized sheet: although the performance is better, its more stable chemical property requires little attention during recovery, but the recovery is not affected in general.

·Contamination degree of pre painted galvanized sheet: if the surface of pre painted galvanized sheet is stained with oil stain, other metals or chemical substances, its recycling value will be reduced or even it will be rejected.

Form and cleanliness of pre painted galvanized sheet:

·Factory scrap: such as trim and punch scraps, clean and tidy, most popular among recyclers, with the highest value.

·Removal of old materials: from old building roofs, wall panels, etc. The value depends on whether other materials (such as insulation cotton, screws, rubber washers, etc.) are mixed during disassembly, and the cleaner the separation is, the higher the value is.

Market supply and demand: domestic and international steel price directly determines the price of recovered pre painted galvanized sheet.

2, How do I maximize the recycling value of pre painted galvanized sheet?

Source classification: in the production and construction links, the pre painted galvanized sheet waste shall be stored separately from other garbage (such as plastic and wood). This is the most critical step in value improvement.

Professional partner: establish long-term cooperation with formal and qualified scrap steel recycling enterprises. They can provide reasonable price and compliance process.

Technical Focus: Focus on the development of pre painted galvanized sheet recycling technology, for example, some cutting-edge research is exploring how to more efficiently separate and recover components in coatings to achieve higher value recycling.

The recycling value of the pre painted galvanized sheet perfectly interprets "waste is the resource of the wrong place". It is not only a realizable waste material, but also a sustainable asset throughout the whole life cycle of a product.

Selecting to use pre painted galvanized sheet and recycling it responsibly at the end of its life cycle is the triple victory of economic benefit, environmental responsibility and social image for enterprises. It is undoubtedly a foresight and wise decision to pay attention to and make good use of the recycling value of colored rolls when green and low carbon has become a global consensus.

Real roll recovery cases to show the complete cycle from "scrap" to "new resources".

Description: Large Steel Structure Construction Company Color-coated Plate Waste Recycling Project

Background Introduction

·RECLAIMER: "A Certain Building Technology Co., Ltd. in China" (hereinafter referred to as Company A), a large steel structure building manufacturer, provides roof and wall panels for industrial plants, logistics warehouses, etc.

·Color coating roll type: sea blue color coating roll with PE polyester coating using 0.5mm thick aluminized zinc base plate.

·Source of waste material: when fabricating roof tiles for customers, a large amount of fixed-length trimming materials and punch formed residual materials will be produced. These wastes are clean and tidy, but they are piled up like mountains, occupying the warehouse space and having potential safety hazards.

Detailed recovery process

Step 1: Internal collection and pretreatment

Source classification: A company has set up a special "color coating steel scrap recycling area" in the production workshop. The operator will immediately transport the waste materials to the area after changing the coiled materials or completing the cutting, and strictly avoid mixing with ordinary household garbage, plastic packaging, etc.

Preliminary packing: Use a hydraulic packing machine to compress the loose strip and block scraps into tight cubic bundles (about 1-1.5 tons each). This significantly reduces storage space and transportation costs.

Step 2: Seeking for Partners and Bargaining

Bidding cooperation: Company A did not contact scattered vendors, but sent bidding invitation to several qualified and large scrap steel recycling and processing enterprises.

Quality evaluation: the recycling enterprise sends a special person to the factory for inspection:

·Composition confirmation: confirm the base plate is aluminized zinc steel through material certificate.

·Cleanliness check: confirm that the waste material is free of oil, other metal or non-metallic impurities.

·FORM ASSESSMENT: accept packing form for ease of handling and subsequent handling.

Pricing mechanism: the price agreed by both parties is not a one-shot price, but a floating formula based on the "average market price of heavy scrap steel in the area where the day is located x discount coefficient".

·Why is there a discount? Since the organic coating on the surface of the color coated roll is an "impurity" during steel making, it requires additional energy to burn it and generate a small amount of slag, which increases the treatment cost of the recycling plant.

·Final pricing: Assuming that the price of heavy steel scrap on that day is 3000 yuan/t and the discount coefficient agreed by both parties is 0.92, the price of color coating roll scrap of East China Green Building is: 3000 yuan/t × 0.92=2760 yuan/t. This price is far higher than the 2300 yuan/t previously sold to the peddlers.

Step 3: Transportation and handover

Compliance transportation: the winning recycling enterprise sends qualified trucks to load. Weigh and record the whole process, and issue a formal Renewable Resources Recovery Voucher.

Data record: The Logistics Department and Finance Department of Company A record the tonnage, unit price and total amount of the sales in detail as the evidence of environmental performance and financial income.

Step 4: Processing and recycling of recycling plant (value sublimation link)

The recycling enterprises transport the waste of color coating roll to the processing center, and then conduct the following treatment:

Crushing and Sorting: Use a large crusher to crush the packing material into smaller and uniform pieces.

Magnetic separation and impurity removal: ensure the purity of steel materials through magnetic separator, and use air separation and other technologies to remove the very small amount of non-magnetic impurities that may be mixed.

Become a high-quality raw material for steel making: clean color coated steel chips are transported to large electric arc furnace steel making plants (such as Baowu Group and Shagang).

Putting into Furnace: In an arc furnace, these pieces, together with other scrap steel, melt at high temperatures. The PE coating on the surface is quickly gasified and combusted at a high temperature of over 1000 ° C, consumed as a part of energy, and finally the residual trace inorganic substances become the slag floating on the surface of molten steel and removed.

Regenerative: the molten molten steel is refined, continuously cast and rolled into new billets. These billets can be rolled into new galvanized coil and color coated coil substrates, and even used for manufacturing automobiles, household appliances, etc.

Summary of recovery results

·Economic benefits:

·Through this transaction, Company A treats about 50 tons of waste per month and obtains about 138000 yuan of direct income, becoming a stable "sideline" income.

·Save the original garbage removal and disposal costs.

·Environmental benefits:

·Resource saving: equivalent to saving about 75 tons of iron ore, 30 tons of coal and a lot of new water.

·Carbon reductions: This process reduces carbon dioxide emissions by about 43 tonnes (estimated from industry general formulae) compared to making steel from iron ore.

·Harmless: avoid potential pollution to soil and groundwater caused by illegal landfill or random stacking of scrap steel.

·Management and Brand Effectiveness:

·Company A successfully obtained the "green factory" certification.

·In the external promotion and bidding projects, we can proudly demonstrate the full life cycle management and high recycling rate of the materials, and win the attention of environmentally friendly customers.

This case clearly shows that the recycling of color coated roll is a standardized and industrialized process perfectly combining environmental responsibility, economic benefits and brand image, and is a very successful micro practice of circular economy.