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Coal slurry concentration increasing and industrial wastewater treating process and device

A process and technology of coal slurry, which is applied in the field of coal slurry thickening and industrial wastewater treatment process and equipment, can solve the problems that restrict the sustainable development of the chemical fertilizer industry, achieve saving coal and water consumption, increase concentration, and reduce sewage treatment costs Effect

Active Publication Date: 2017-11-03
HUBEI YIHUA CHEMICAL INDUSTRY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, it is imperative to reduce the discharge of ammonia nitrogen wastewater in the fertilizer industry. If this problem is not paid attention to and dealt with well, it will definitely restrict the sustainable development of the fertilizer industry.

Method used

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  • Coal slurry concentration increasing and industrial wastewater treating process and device
  • Coal slurry concentration increasing and industrial wastewater treating process and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Coal type 1: ash content 16.1 wt%, ash melting point 1300°C, Hastelloy grindability index 55, viscosity 1000 Pa.s.

[0031] 1) Crush the coal, then add coal grinding water and additives, and then conduct coarse grinding until the particle size is below 50 μm to obtain slurry 1;

[0032] 2) Take 25wt% slurry 1, add coal grinding water for shaping and grinding, until the average particle size is 20 μm, and obtain slurry 2; the remaining slurry 1 is pumped to the coal-water slurry storage tank;

[0033] 3) Take 15wt% of slurry 2 and perform ultrafine grinding until the average particle size is 5 μm to obtain slurry 3; the rest of slurry 2 and newly obtained slurry 3 are sent to the coarse grinding stage for coarse grinding;

[0034] Through the coarse grinding of step 1) and repeated operations of steps 2) and 3), the purpose of effectively increasing the concentration of the coal-water slurry in the coal-water slurry storage tank is achieved. The concentration of coal wa...

Embodiment 2

[0037] Coal type 2: ash content 14.7 wt%, ash melting point 1233°C, Hastelloy grindability index 60, viscosity 1100 Pa.s.

[0038] 1) Crush the coal, then add coal grinding water and additives, and then conduct coarse grinding until the particle size is below 50 μm to obtain slurry 1;

[0039]2) Take 30wt% slurry 1, add coal grinding water for shaping and grinding until the average particle size is 30 μm, and obtain slurry 2; the remaining slurry 1 is pumped to the coal-water slurry storage tank as a coal-water slurry product to wait for gas change;

[0040] 3) Take 20wt% of the slurry 2 and perform ultra-fine grinding until the average particle size is 5 μm to obtain the slurry 3; the rest of the slurry 2 and the newly obtained slurry 3 are sent to the coarse grinding stage for coarse grinding;

[0041] Through the coarse grinding of step 1) and repeated operations of steps 2) and 3), the purpose of effectively increasing the concentration of the coal-water slurry in the coa...

Embodiment 3

[0047] Coal Type 3: Ash content 13.9 wt%, ash melting point 1240°C, Hastelloy grindability index 70, viscosity 1300 Pa.s.

[0048] 1) Crush the coal, then add coal grinding water and additives, and then conduct coarse grinding until the particle size is below 50 μm to obtain slurry 1;

[0049] 2) Take 35wt% slurry 1, add coal grinding water for shaping and grinding until the average particle size is 25 μm, and obtain slurry 2; the remaining slurry 1 is pumped to the coal-water slurry storage tank as a coal-water slurry product waiting for gas change;

[0050] 3) Take 25wt% of slurry 2 and perform ultrafine grinding until the average particle size is 10 μm to obtain slurry 3; the rest of slurry 2 and newly obtained slurry 3 are sent to the coarse grinding stage for coarse grinding;

[0051] Through the coarse grinding of step 1) and repeated operations of steps 2) and 3), the purpose of effectively increasing the concentration of the coal-water slurry in the coal-water slurry ...

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Abstract

The invention discloses a coal slurry concentration increasing and industrial wastewater treating process and device. The process comprises the following steps: (1) crushing coal, and then adding water and a dispersant for coarse grinding till the particle size is 50 microns or below, thus obtaining slurry 1; (2) performing shaping grinding on 25 to 35 weight percent of slurry 1 till the particle size is 20 to 30 microns, thus obtaining slurry 2, and pumping the residual slurry 1 serving as a water coal slurry product into a water coal slurry storage tank for gasification; (3) performing ultrafine grinding on 15 to 25 weight percent of the slurry 2 till the particle size is 5 to 10 microns, thus obtaining slurry 3, and conveying the residual slurry 2 and the newly obtained slurry 3 into the coarse grinding stage for coarse grinding, wherein after the coarse grinding in the step (1) and the steps (2) and (3) are repeatedly performed for multiple times, the aim of effectively increasing the concentration of the slurry 1 is fulfilled. In the concentration increasing process, used water can be replaced with industrial wastewater. According to the coal slurry concentration increasing and industrial wastewater treating process disclosed by the invention, the concentration of the coal slurry can be increased by at least 3 percent; the gasification energy consumption can be substantially reduced; the coal slurry concentration increasing and industrial wastewater treating process has the characteristics of safety, reliability, convenience in improvement and obvious economical benefits.

Description

technical field [0001] The invention belongs to the technical field of coal-water slurry preparation, relates to the upgrading of coal-water slurry, and also relates to a process of using industrial waste water to thicken coal-water slurry, in particular to a coal-slurry thickening and industrial waste water treatment process and device. Background technique [0002] Lignite is a kind of low-rank coal. There are abundant lignite resources at home and abroad. The discovered reserves of lignite resources in my country are about 129.132 billion tons, accounting for about 12.7% of my country's coal reserves. Due to the high water content of lignite, low calorific value, and long-distance transportation and flammability, the development of coal chemical industry has become the focus of the industry by using lignite resources on site. However, the characteristics of lignite's high internal water content and many pores lead to its low slurry concentration, generally 30% to 50%, w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L1/32C10L1/24B02C21/00
CPCB02C21/00C10L1/2437C10L1/326C10L2290/28
Inventor 蒋远华杨晓勤黄志亮张忠华虞云峰朱月李进张战利夏同成张元堂肖国付明
Owner HUBEI YIHUA CHEMICAL INDUSTRY CO LTD
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