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Caustic sludge drying accelerating method

An alkali slag and dry-solid technology, which is applied in chemical instruments and methods, filling, soil protection, etc., can solve the problems of high product cost, low strength, large investment, etc.

Inactive Publication Date: 2003-01-22
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the alkali slag is difficult to dry naturally, it is not easy to dry after several years of storage. If it is used for land reclamation, it must be stacked for a long time. hard to use
It is also reported that the use of alkali slag waste as a filler for building materials, land improvement agents, fertilizers or feed additives, etc., but because the investment is too large and the cost of the processed product is too high, it is still rarely implemented in industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0006] Example 1 Alkali slag dry solid test 1

[0007] The alkali slag adopts the discharge waste slag provided by the alkali factory of Dalian Chemical Industry Company, and the bulk specific gravity is about 1.27 g / cm 3 , pH value is 9.6 ~ 12.5. Put 10 grams of alkali slag in a beaker, add 0.1% nitric acid by weight, 5% aluminum sulfate, and 500ppm polyacrylamide, and place it under normal temperature and pressure for 72 hours, and you can get a compressive strength of about 1.8 to 2.2 kg / cm 2 dry solid alkali slag.

example 2

[0008] Example 2 Alkali slag dry solid test 2

[0009] Dig 2.5 meters square on the ground, a pit about 2 meters deep, put the alkali slag of about 20 tons of heavy example 1 in the pit, then put into about 1.2 cubic meters of dry solid agent aqueous solution (containing 20 kilograms of hydrochloric acid, 10 kilograms aluminum sulfate), observed after 10 days of natural placement, the edge cracked, and the compressive strength can reach 1.5 kg / cm 2 .

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PUM

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Abstract

The said method is that the solidifying and drying agent in the amount of 0.1-10% of the caustic sludge weight is added into caustic sludge; and the solidifying and drying agent consists of acid in 20-60 wt%, salt in 10-40 wt%, and flocculant in 10-40 wt%. It can shorten caustic sludge drying period, so that the present invention provides one way for reasonable utilization of caustic sludge and reduction of environment pollution.

Description

technical field [0001] The invention relates to a treatment method for industrial discharge waste alkali slag, in particular to provide a method capable of accelerating the drying and solidification of alkali slag. This method can be used to effectively treat the alkali slag waste and carry out land reclamation. Background technique [0002] Alkali slag mainly refers to the waste liquid and waste slag discharged from the ammonia-soda plant, and its suspension is a colored turbid liquid with a pH value of 10.4-11.43 and a relative density of 1.11-1.13 g / cm 3 , the main components are calcium chloride and sodium chloride, the waste residue is white paste, and the bulk specific gravity is about 1.27 g / cm 3 , the main components are a large amount of calcium salt, magnesium salt, sodium salt, iron oxide and acid insoluble matter, and the pH value is 9.6-12.5. At present, most of the ammonia-alkali factories in the world use the method of discharging liquid and solid residue se...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B18/04C09K17/00E02D3/12E02D17/18
CPCY02W30/91
Inventor 谢茂松王学林杨旭徐桂芬
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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