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Method for preparing compound fertilizer intermediate from pickling sludge

A technology of pickling sludge and compound fertilizer, which is applied in the direction of application, magnesium fertilizer, inorganic fertilizer, etc., can solve problems such as pollution, and achieve significant environmental and social benefits

Inactive Publication Date: 2018-03-06
LIANYUNGANG BAOXIANG CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the defects of the prior art, the present invention provides a method for preparing a compound fertilizer intermediate by using pickling sludge. The fire method high-temperature reduction treatment of pickling sludge has a simple process and realizes The recycling of ferronickel and effective waste reuse not only solve the problem of environmental pollution, but also create economic benefits

Method used

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Experimental program
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Effect test

Embodiment Construction

[0015] A kind of method that utilizes pickling sludge of the present invention to prepare compound fertilizer intermediate specifically comprises following processing steps:

[0016] Step 1: Add 13% quicklime GaO to the pickling mud, stir it evenly, pile it up, and let it stand for 8 days to produce an acid-base neutralization chemical reaction, so that GaO can fully combine with the acid radicals in the pickling mud to obtain a neutral sludge. This process step can greatly reduce the sulfur dioxide gas produced in the high-temperature sintering of the pickling mud in the following steps, so that the sintering tail gas can be guaranteed to meet the national emission standards after treatment.

[0017] Step 2, kiln sintering into blocks: introducing the neutral sludge obtained in step 1 into the kiln to sinter into blocks;

[0018] In the usual pyro-reduction treatment of pickling mud, the energy consumption is very high, and the mixing ratio of coal-raw material is more than ...

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Abstract

The invention relates to a method for preparing a compound fertilizer intermediate from pickling sludge. The method comprises the following specific steps: pickling the sludge and quick lime; stacking; carrying out acid and alkali neutralization chemical reaction; sintering in a kiln to obtain blocks; refining nickel and iron in a blast furnace; carrying out melting chemical reaction on residual waste slag obtained after the nickel and the iron are refined and wastewater obtained after treatment of tail gases; and generating a silicon magnesium calcium sulfur compound fertilizer intermediate.The method disclosed by the invention provides a novel path for resource utilization of the pickled sludge and meets the demands of circular economy and low-carbon economy, and has the advantages of obvious energy-saving and emission-reducing effects as well as remarkable environment and social benefits.

Description

technical field [0001] The invention relates to an application field of pickling sludge treatment and reuse, in particular to a method for preparing a compound fertilizer intermediate by using pickling sludge. Background technique [0002] In the production process of high-grade steel such as stainless steel, it is necessary to pickle the surface of the steel with a variety of strong acids, and the waste after pickling is called pickling mud. Because the pickling mud is strongly acidic, it is a poisonous and harmful substance, and it is a national control item; but there are considerable amounts of iron, nickel, chromium and other metals in the pickling mud. If it can be used to turn waste into treasure, it will have a good Social benefits and great economic value. [0003] At present, many researchers in various countries have studied the treatment of pickling mud and invented the chemical extraction method. It can be found in practice that the input of this method is high...

Claims

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Application Information

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IPC IPC(8): C05G1/00C22B7/00C22B23/02
CPCC05D3/00C22B7/001C22B23/023C05D5/00C05D9/00Y02P10/20Y02P20/10
Inventor 相庆柱相庆华彭春艳杨芳吴亚群
Owner LIANYUNGANG BAOXIANG CASTING