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Gasified black water fine slag residual carbon recovery-tailing calcium and magnesium content reduction method

A technology for fine slag and tailings, which is used in the recovery of carbon residues in Texaco furnace gasification black water fine slag and the reduction of calcium and magnesium content in tailings after carbon extraction, and the recovery of carbon residues in coal chemical gasification blackwater fine slag-tails In the field of calcium and magnesium slag reduction, it can solve the problems of high content of calcium and magnesium alkaline minerals in tailings, which cannot be comprehensively utilized, and difficult to recover carbon residue from gasification fine slag. Effect

Pending Publication Date: 2021-12-07
ZHENGZHOU MINERALS COMPOSITIVE UTILIZATION RES INST CHINESE GEOLOGICAL ACAD
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  • Application Information

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Problems solved by technology

[0008] The present invention proposes a method of gasification black water fine slag residual carbon recovery-tailing slag calcium and magnesium reduction, to solve the problem of difficult recovery of gasification fine slag residual carbon, The high content of calcium and magnesium alkaline minerals in the tailings after carbon extraction is a technical problem that cannot be comprehensively utilized

Method used

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  • Gasified black water fine slag residual carbon recovery-tailing calcium and magnesium content reduction method
  • Gasified black water fine slag residual carbon recovery-tailing calcium and magnesium content reduction method
  • Gasified black water fine slag residual carbon recovery-tailing calcium and magnesium content reduction method

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Embodiment 1

[0053] The loss on ignition of the gasification black water fine slag raw ore of a chemical company in Inner Mongolia is 48.48%, the total content of CaO and MgO is 7.08%, and other chemical components are mainly silica, alumina, and iron oxide. use figure 2 As shown in the process flow, the high-frequency screening operation obtains +0.2mm coarse-grained products and -0.2mm fine-grained products. The medium magnetic separation adopts a semi-countercurrent drum magnetic separator with a magnetic field strength of 477KA / m, and the strong magnetic separation A plate magnetic separator with a magnetic field strength of 716KA / m is used. This embodiment has obtained three kinds of products altogether, wherein product 1: productive rate is 40.98%, the loss on ignition is 81.31%, the total content of calcium oxide and magnesium oxide is 2.07%, the carbon recovery rate is 67.36% high-quality fine carbon powder , the product can be dehydrated and dried to achieve circular gasificatio...

Embodiment 2

[0059] The loss on ignition of the raw ore of gasification black water fine slag in a chemical company in Ningxia is 36.40%, the total content of CaO and MgO is 6.35%, and the other chemical components are mainly silica, alumina, and iron oxide. image 3 As shown in the process flow, a grading high-frequency screening operation obtains +0.074mm coarse-grained products and -0.074mm fine-grained products, and a fine-graded high-frequency screening operation obtains +0.2mm coarse-grained products and -0.2mm mm fine-grained products, the medium magnetic separation uses a semi-countercurrent drum magnetic separator with a magnetic field strength of 557KA / m, and the strong magnetic separation adopts a high-gradient strong magnetic separator with a magnetic field strength of 1195KA / m. Present embodiment has obtained three kinds of products altogether, and wherein product 1: productive rate is 30.07%, loss on ignition is 82.11%, recovery rate is 67.02% carbon concentrate, and wherein c...

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Abstract

The invention provides a gasified black water fine slag residual carbon recovery-tailing calcium and magnesium content reduction method. The main process route comprises concentration reselection, fine classification and two-stage magnetic separation, and the method comprises the following steps that gasified black water is concentrated to obtain concentrated slag slurry, the concentrated slag slurry is subjected to reselection operation to obtain reselected light minerals and reselected heavy minerals; the reselected light minerals are concentrated and then subjected to classification operation, coarse-fraction products and fine-fraction products are obtained, the coarse-fraction products are concentrated and dehydrated, and high-calorific-value carbon powder is obtained; and the reselected heavy mineral and the fine fraction product are combined and sent to be subjected to magnetic separation operation, the magnetic separation operation comprises first-stage medium magnetic separation and second-stage strong magnetic separation, magnetic substances obtained through the first-stage medium magnetic separation and the second-stage strong magnetic separation are concentrated and dehydrated to obtain calcium-magnesium-rich low-carbon tailings, and non-magnetic substances obtained through the second-stage strong magnetic separation are concentrated and dehydrated to obtain low-calcium-magnesium pore-rich tailings. The method is used for solving the technical problems that residual carbon in gasified fine slag is difficult to recover, and tailings after carbon extraction are high in calcium and magnesium alkaline mineral content and cannot be comprehensively utilized.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of solid waste, in particular to a method for coal chemical gasification black water fine slag residual carbon recovery-tailing slag calcium and magnesium reduction, especially a Texaco furnace gasification black water fine slag Method for recovering medium residual carbon and reducing calcium and magnesium content in tailings after carbon extraction. Background technique [0002] my country's 14 large-scale coal bases with a capacity of 100 million tons and the 4 major coal chemical industry bases have an annual increase of about 75 million tons of gasification slag solid waste. The progress of comprehensive utilization is slow, and the comprehensive utilization rate is low. At present, it mainly adopts centralized clearing and transportation, and the slag dump is disposed of in the form of black powder after storage. The problems of land occupation, environmental pollution, and ...

Claims

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Application Information

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IPC IPC(8): B03B7/00B03B9/06
CPCB03B7/00B03B9/06Y02W30/52
Inventor 刘广学彭团儿邵伟华张艳娇郭珍旭王力冯乃琦刘长淼
Owner ZHENGZHOU MINERALS COMPOSITIVE UTILIZATION RES INST CHINESE GEOLOGICAL ACAD
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