Alkali melting pot quality appraisal

alkali melting pot is based on the core principle of high-temperature melting and chemical reaction synergy. By optimizing heating efficiency, temperature control accuracy and corrosion resistance, it achieves synergy of material melting uniformity, reaction completeness and energy consumption control. It is widely used in chemical industry, metallurgy, glass manufacturing and solid waste treatment and other fields. In the sodium hydroxide smelting process, it is used for efficient decomposition of bauxite; in the metallurgical industry, it meets the reduction and smelting needs of metal oxides; in hazardous waste treatment, it ensures the harmless treatment of alkali-containing waste residue. Compared with traditional smelting equipment, alkali melting pots have the characteristics of high temperature resistance, excellent sealing and automatic temperature control, and are the core equipment of high-temperature alkali process.

Zhongke Testing is a product quality appraisal service organization registered with the court. It can provide alkali melting pot quality appraisal services. It has a professional appraisal team and advanced instruments and equipment to provide fair and accurate appraisal results for alkali melting pot quality appraisal.

The litigation quality appraisal of alkali melting pot usually adopts the following technical methods:

1. Appearance inspection: Check the appearance of the alkali melting pot for cracks, deformation, rust and other defects.

2. Material analysis: Use X-ray fluorescence spectrometer or other analysis equipment to analyze the material of the alkali melting pot to determine whether its chemical composition meets the standard requirements.

3. High temperature resistance performance test: Put the alkali melting pot into the muffle furnace, keep it at the specified temperature for a certain period of time, and observe its high temperature resistance performance.

4. Condensation efficiency test: Connect the alkali melt pot and condenser, mix the sample to be tested with the alkaline flux, heat and melt, collect the generated carbon dioxide gas, and measure the condensation efficiency.

A chemical factory of the applicant signed a "Nickel-based Alloy Alkali Melting Pot Purchase Contract" with an equipment manufacturer of the respondent, stipulating that the corrosion resistance rate is ≤0.05mm/year. After being put into production, the local corrosion of the lining reached 2mm/year. The manufacturer argued that it was caused by the operating temperature exceeding the limit.

Identification analysis results:

The quality analysis expert group discussed and comprehensively analyzed the relevant information of the "Alkali Melting Pot", contract technical agreement, on-site investigation case materials and other data, and made the following quality analysis Analytical opinion:

The nickel-chromium alloy lining of the alkali melting pot involved in the case has a Cr content of only 18% (agreement ≥ 25%), and an alkali-resistant current density of 5 μA/cm² (agreement ≤ 1 μA/cm²); the thermocouple calibration deviation is +20°C, causing the actual melting temperature to exceed the agreement value by 100°C.

The appraisal conclusion concluded that defects in material composition and temperature control system are the main causes of accelerated corrosion.

Alkali melting pot quality appraisal report should include:

1, appraisal purpose (such as corrosion failure attribution, process compliance verification) and reference standards;

2, involved equipment model, material batch, operation log;

3, detection method and equipment list (Such as