Compositions and methods for purification of metals from steel making waste streams

A metal and mixture technology, applied in recycling technology, process efficiency improvement, calcium/strontium/barium chloride, etc., can solve problems such as volatile ammonia

Inactive Publication Date: 2021-07-23
里克希维亚有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ammonia is volatile, and using large quantities of ammonia requires environmental controls

Method used

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  • Compositions and methods for purification of metals from steel making waste streams
  • Compositions and methods for purification of metals from steel making waste streams
  • Compositions and methods for purification of metals from steel making waste streams

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] Example 1: A simulated spent acid wash solution was prepared by adding 54.1 g of 37% HCl to 83.2 g of water. Add 62.7g FeCl to the HCl solution 2 2H 2 O, stir the mixture until the ferrous chloride is completely dissolved. The resulting solution was medium green (much like pickle juice) and contained 10 wt% HCl and 20 wt% FeCl 2 .

[0077] Into a 500 mL beaker was added 300 g of water and 2.00 g of monoethanolamine hydrochloride (MEACl) chosen as lixiviant. The resulting solution was magnetically stirred at 500 rpm and a pH probe with a data logger was placed in the solution. The pH of the solution was about 5.3. 30 g of BOF slag ( image 3 shown. As the reaction progressed, the color of the slurry was observed to change from dark brown (typical slag color) to dark green, indicating the formation of Fe 2 (OH) 2 solid. The total amount of the added simulated waste pickling solution is 55.96g.

[0078] After extracting the required amount of calcium, the mixture ...

Embodiment 2

[0080] Example 2: In a 500mL beaker, 1.25g of MEA was diluted into 300g of water, and the solution was magnetically stirred at a speed of 500rpm. To the stirred solution was added 1 chloride equivalent (4.75 g) relative to MEA of the simulated spent acid wash (prepared in Example 1). A dark green precipitate formed, consistent with the formation of ferrous hydroxide. The pH of the measured solution was about 8. With constant agitation, an additional 2.73 g of simulated spent acid wash was added to bring the total acid to MEA parity. The solution re-cleared yellow / orange and had a pH of 3-4.

Embodiment 3

[0081] Example 3: In a 500mL beaker, 1.25g of MEA was diluted into 300g of water, and the solution was magnetically stirred at a speed of 500rpm. Add 6.0g CaCl to it 2 2H 2 O to provide partially extracted CaCl similar to that described in Example 1 2 Loading (1.5%). To the stirred solution was added 1 chloride equivalent (4.75 g) relative to MEA of the simulated spent acid wash (prepared in Example 1). A dark green precipitate formed, consistent with the formation of ferrous hydroxide. With constant agitation, an additional 2.73 g of simulated spent acid wash was added to bring the total acid to MEA parity. The solution re-clarified and the resulting solution was yellow / orange.

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Abstract

Systems and methods are described in which spent pickle liquor from metal cleaning processes is utilized to regenerate a lixiviant used to recover valuable metals from industrial waste and other sources. The spent pickle liquor is neutralized and solvated metals in the spent pickle liquor are precipitated in this process. When the industrial waste is slag from a metal refining process a partially closed metal production process can be implemented, where spent pickle liquor from cleaning of the refined metal is used to regenerate a lixiviant used to recover a different, valuable metal from a waste slag of the process, with precipitated salts from the lixiviant regeneration being returned as a raw material in the metal refining process. As a result waste streams from these processes are dramatically reduced or eliminated.

Description

technical field [0001] The present invention is in the field of treatment or use of waste streams from metal processing. Background technique [0002] The following description includes information that may be helpful in understanding the present invention. No admission is made that any information provided herein is prior art or relevant to the presently claimed invention, or that any publication specifically or implicitly referenced is prior art. [0003] Steel production and processing generate large amounts of waste. One of the main waste streams is slag in various forms (BOF, LMF, desulfurization, dephosphorization, etc.). For every ton of crude steel produced, about 300kg of steel slag will be produced. Another waste from steel processing is due to pickling, a process involving the chemical dissolution of impurities on the steel surface. Pickling is performed using a variety of acidic preparations, all of which form soluble salts with surface contaminant components...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/24C22B7/04C22B7/00C22B26/20
CPCC22B7/04C22B26/20C01F11/24C01F5/14C01G49/02C22B26/22C22B3/22C21B3/04C21C5/36C21B3/02C21B5/04C21B5/02Y02P10/20Y02W30/50C23G1/36C22B3/1625C22B3/165C21B3/06
Inventor 迈克尔·D·怀尔斯塔
Owner 里克希维亚有限公司
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