In industrial production,ash removal is a key process,especially in leather manufacturing,petrochemical refining,metal surface treatment and other fields.The ash removal effect directly affects product quality and production efficiency.Multi functional ash removal agents,as an efficient and environmentally friendly ash removal solution,are gradually becoming the focus of industry attention.This article will systematically analyze the core value of multifunctional deliming agents from four dimensions:definition,characteristics,application areas,and future trends.
Multifunctional deliming agent is a composite chemical additive that can remove ash content(such as alkaline substances,metal oxides,inorganic salts,etc.)from the surface or interior of materials through chemical or physical actions.Its core functions include neutralizing alkaline substances,dissolving metal ions,dispersing impurity particles,and possessing auxiliary characteristics such as buffering pH value and preventing material acid swelling.According to their composition and mechanism of action,multifunctional deliming agents can be divided into the following four categories:
Mainly composed of strong acid and weak base salts such as ammonium sulfate and ammonium chloride,the pH value of the material is reduced through neutralization reaction.Its advantages lie in low cost and simple operation,but it is prone to ammonia nitrogen pollution and may cause gelatinization of collagen fibers(such as leather).The typical application scenario is traditional leather ash removal,but it needs to be combined with wastewater treatment equipment to reduce environmental pollution.
Using weak organic acids such as lactic acid,formic acid,citric acid,etc.,stabilize the pH value of the ash removal solution through a buffer system(usually between 7.5-9).This type of ash remover has a mild effect,which can prevent surface acid swelling of the material,and the generated calcium salts(such as calcium lactate)are easily soluble in water,making it easy to clean.For example,in leather de ashing,lactic acid de ashing agent can make the grain smooth and fine,suitable for high-end leather production.
Developed to meet environmental protection needs,using non expanding acids such as dicarboxylic acid and sulfophthalic acid as core components,completely eliminating ammonium salts and boric acid,and eliminating ammonia nitrogen and heavy metal pollution from the source.For example,the Daweilika DLH ammonium free ash remover achieves deep ash removal by forming soluble calcium salts,while meeting the requirements of the ZDHC production restricted substance list,making it the preferred solution for clean leather production.
Using carbon dioxide(CO₂)to react with alkaline substances to generate soluble bicarbonate,achieving ash removal without the addition of chemical reagents.This system has a gentle and uniform effect,and can partially replace ammonium salt for ash removal,reducing the cost of wastewater treatment.For example,in leather ash removal,CO₂gas ash removal can make the particle surface compact,but the pH range(4.4-8.3)needs to be controlled to avoid calcium salt precipitation.
The performance advantage of multifunctional deliming agent comes from its composite formula design,mainly reflected in the following characteristics:
Through synergistic effects,multifunctional deliming agents can simultaneously remove free,adsorbed,and bound ash content from materials.For example,in the field of petrochemical refining,a new water-based ash removal agent can reduce the ash content of catalytic oil slurry from 2800μg/g to 87μg/g,with a ash removal rate of 97.7%,meeting the quality requirements of needle coke raw materials.
The ammonium free ash removal agent significantly reduces the chemical oxygen demand(COD)and biological oxygen demand(BOD)of wastewater by eliminating ammonia nitrogen emissions.For example,the L1831 carbonate ammonia free ash removal agent from South Korea decomposes into ethanol and carbon dioxide during the ash removal process,reducing the total nitrogen content of wastewater by 65%,which meets international environmental standards.
Buffer salts(such as sodium dicarboxylate)are often added to multifunctional deliming agents to maintain the stability of the pH value of the ash removal solution and avoid surface acid swelling or hydrogen sulfide gas production caused by local pH drops.For example,in leather graying,a buffering system can ensure that collagen fibers are evenly loosened,improving the softness of the finished leather.
Multifunctional deliming agent reduces reagent usage and shortens process time by optimizing the formula.For example,in catalytic oil slurry treatment,the settling time of water-based ash removal agents is shortened from the traditional 72 hours to 24-48 hours,and the product recovery rate is increased to 98%,significantly reducing production costs.
Multi functional ash removal agents,with their performance advantages,have penetrated into multiple industrial fields and become key additives for improving product quality and production efficiency.
In leather processing,ash removal is an important process after soaking,which directly affects the subsequent softening,pickling,and tanning effects.The multifunctional deliming agent provides conditions for enzyme softening by neutralizing the intradermal lime and reducing the pH value to the appropriate range(8-9).For example,ammonium free ash removal agents can avoid ammonia odor pollution caused by traditional ammonium salt ash removal,while improving grain fineness and meeting the needs of high-end leather production.
The residual catalyst particles(mainly composed of SiO₂and Al₂O3)in catalytic slurry will reduce the utilization value of the slurry.The multifunctional deliming agent achieves efficient purification of oil slurry by neutralizing and condensing charges,allowing particles to aggregate and settle into larger particles.For example,water-based ash removal agents can reduce the ash content of oil slurry to below 100μg/g,meeting the raw material standards for high value-added products such as needle coke and carbon fiber.
The residual ash content on the metal surface,such as iron oxide and welding slag,will affect the quality of subsequent electroplating and painting.Multifunctional deliming agent dissolves metal oxides and disperses impurities to clean metal surfaces and enhance coating adhesion.For example,in aluminum alloy processing,organic acid descaling agents can remove surface oxide films while forming a protective layer to prevent further oxidation.
Ash content in fabrics,such as calcium and magnesium ions,can cause uneven dyeing.Multifunctional deliming agent removes ash through chelation,improving dye uptake.For example,in the pre-treatment of cotton printing and dyeing,ammonium free ash removal agents can replace traditional ammonium salts,reduce the difficulty of wastewater treatment,and improve the texture of the fabric.
With the tightening of environmental regulations and the increasing demand for industrial upgrading,multifunctional deliming agents are developing in the following directions:
Develop ammonium free,phosphorus free,and biodegradable ash removal agents to reduce their impact on the environment.For example,using natural organic acids such as malic acid and tartaric acid instead of chemically synthesized acids can reduce the toxicity of wastewater.
By combining IoT technology,real-time monitoring of parameters such as pH value and ash content of the ash removal solution is achieved to achieve process automation control.For example,by using sensor feedback data,the amount of ash removal agent can be dynamically adjusted to optimize the ash removal efficiency.
Develop a composite additive that integrates functions such as ash removal,softening,and mold prevention to simplify the process flow.For example,in leather processing,the combination of ash removal agent and enzyme softener can achieve one-step ash removal and softening,shortening the production cycle.
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