Thermal washing of oily waste based on gasification black water-integrated process of high-value utilization of fine slag

Abstract

The invention discloses an integrated process for thermal washing of oily waste and high-value utilization of fine residue based on gasified black water. For solid waste, send the oil-water scum to the sorting tank; 2. Clarify the gasified black water to obtain concentrated black water, filter the concentrated black water to obtain gasified fine residue, and separate the gasified black water and gasified fine residue, or Introduce the gasified black water, concentrated black water and gasified fine slag into the sorting tank filled with oil-water scum and stir to obtain a pulp; 3. Flotate the pulp to obtain carbon-rich fine powder and decarbonized tail ash; 4. Put the rich Carbon fine powder is involved in the preparation of gasification slurry, and the decarbonized tail ash is used in construction materials. The present invention highly integrates and couples the gasified black water heat washing oily waste with the separation and enrichment of residual carbon of gasified fine residue, realizes the resourceful treatment of oily waste, reduces the separation cost of carbon-ash in gasified fine residue, It has excellent promotion value and application prospect.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry and environmental protection, and in particular relates to an integrated process of thermal washing of oily waste and high value utilization of fine slag based on gasification black water. Background technique [0002] Coal gasification technology is the leader and core of the coal chemical industry, but the raw coal gasification cannot be completely converted, and some unreacted carbon will be discharged out of the gasifier along with the coal gasification ash. The ash generated in the coal gasification process includes gasification slag (coarse slag) and black water filter cake (fine slag). The carbon content of coarse slag is low and can be directly used as building materials, etc., while the carbon content of fine slag is generally Between 30% and 50%, some even exceed 50%. According to the latest national standard "Fly Ash Used in Cement and Concrete" (GB / T 1596-2017), the los...

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Problems solved by technology

Domestically, there have been public disclosures about the recovery and utilization of gasification fine slag residual carbon, such as patent CN 105524669 A, which discloses the recovery of carbon-rich components through flotation to prepare coal-water slurry, and the low-carbon components are used to adjust the melting point of raw material ash. The patent only does not clarify the specific process of flotation, nor does it explain the flotation reagents that play a key role in flotation costs; patent CN103695066A discloses that the products after separation of anthracite coal-water slurry gasification and fine slag are used for blending or building materials , but the refined carbon calorific value of gasification fine slag is not high, and the economic benefits of boiler co-firing are not good

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