Oxidation improvement method of a low-rank coal collector of waste engine oil
A technology for low-rank coal and waste engine oil, applied in chemical/physical/physicochemical fixed reactors, solid separation, flotation, etc. High-quality low-rank coal products and other issues, to achieve high-yield, high-quality results
Active Publication Date: 2022-06-28
CHINA UNIV OF MINING & TECH
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Problems solved by technology
However, the degree of coalification of low-rank coal is low, and the number and variety of oxygen-containing functional groups on the surface are large. It is difficult to obtain better flotation indicators and high-quality low-rank coal products using conventional flotation collectors.
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Embodiment 1
[0022] Sample waste oil and diesel and motor oil (grade 5W30) from the gas station. The waste oil samples were oxidized by this method. The acid value of the waste oil sample was determined to be 3.73 mg KOH / g, and the dynamic viscosity was determined to be 115.32 mPa·s. First, an aqueous hydrogen peroxide solution was prepared with a mass concentration of 30%, and the pH was adjusted to 4.2 using sodium hydroxide and sulfuric acid solution. Put the prepared aqueous hydrogen peroxide solution and waste oil raw material into the reaction kettle, control the reaction time to be 1 h, control the reaction temperature to be below 40°C, and use the hydrogen peroxide aqueous solution to be 5% of the mass of the waste oil raw material. Ribbon stirring was used in the reactor to continue stirring. After the reaction is completed, a 200-mesh filter screen is used for filtration, and an improved waste oil collector is obtained after the filtration is completed.
[0023] The laboratory...
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The invention discloses a method for improving the oxidation of a low-order coal collector for waste engine oil, which comprises the following steps: (1) preparing an aqueous hydrogen peroxide solution with a pH value of 3.5-5.5 as an oxidant for waste engine oil; (2) Put the aqueous hydrogen peroxide solution prepared in step (1) and waste engine oil raw materials into the reactor, control the reaction time at 0.5-2h, and control the reaction temperature at 20-40°C; (3) After the reaction is completed, put the product in the reactor Filtration is performed to remove waste slag and chemical deposits to obtain an improved low-rank coal collector. The composition of the waste engine oil treated by the invention is improved, the viscosity is reduced, and the heavy metal ions and solids in the waste engine oil are oxidized to form waste residue, which is filtered and removed, thereby reducing the pollution of the waste engine oil to a certain extent. The invention "turning waste into treasure" effectively converts waste engine oil into a high-efficiency low-rank coal flotation collector, has the advantages of good effect, low cost and little pollution, and realizes the recycling of resources.
Description
technical field [0001] The invention belongs to the technical field of mineral flotation, and relates to a method for improving waste oil as a coal slime flotation collector. Background technique [0002] Low-rank coal is the most important type of coal in my country's coal resources, accounting for about 45% of my country's coal reserves. The coal-based energy structure is the foothold and foundation of my country's current development. Efficient and clean utilization of low-rank coal is one of the current difficulties in coal utilization. The output of low-rank coal slime is large and the particle size of slime is fine. The use of flotation to sort and enrich low-rank coal is one of the main methods for processing low-rank coal. However, low-rank coal has a low degree of coalification and a large number and variety of surface oxygen-containing functional groups. It is difficult to use conventional flotation collectors to obtain better flotation indicators, and it is diff...
Claims
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IPC IPC(8): B01J19/20B03D1/14
CPCB01J19/20B03D1/14
Inventor 廖寅飞杨哲刘泽晨安茂燕曹亦俊马子龙
Owner CHINA UNIV OF MINING & TECH