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Method for producing cement with nickel furnace slag

A technology of slag and cement, which is applied in the direction of cement production, etc., can solve the problem of limited consumption, and achieve the effects of increasing consumption, qualified stability, and releasing stress in advance

Active Publication Date: 2013-10-30
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the magnesium oxide content in the laterite nickel slag is relatively high, generally 25%-40%. In order to meet the quality standards of cement, the amount of this slag in cement is very limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Take 100kg of nickel extraction slag from lateritic nickel ore, including 35.1% MgO content, 3.5kg of stabilizer, add 100kg of water, and carry out wet grinding. After high-speed ball milling, the slurry temperature reaches 40 o C. The slurry is introduced into the stabilization tank, and dried after 3 days of heat preservation and stabilization. Grind the dried slag with 81kg of cement clinker and 10kg of gypsum. Grind to 300m 2 / kg. The product has been tested for steam stability, and its steam expansion value is 0.12%, which is less than the standard requirement of 0.5%. The compressive strength of cement 28d is 47.5MPa, and the flexural strength is 7.4MPa.

Embodiment 2

[0020] Take 100kg of nickel extraction slag from laterite nickel ore, including 38.6% MgO content, 0.38kg of stabilizer, add 55kg of water, and carry out wet grinding. After high-speed ball milling, the slurry temperature reaches 68.5 o C. The slurry is introduced into the stabilization tank, and dried after being kept warm and stabilized. Grind the dried slag with 257kg cement clinker and 29kg gypsum. Grind to 300m 2 / kg. The product is tested for steam stability, and its steam expansion value is 0.26%, which is less than the standard requirement of 0.5%. The compressive strength of cement 28d is 54.8MPa, and the flexural strength is 8.5MPa.

Embodiment 3

[0022] Take 100kg of slag from nickel sulfide ore, in which the MgO content is 15.7%, add 3.9kg of stabilizer, add 75kg of water, and carry out wet grinding. After high-speed ball milling, the temperature of the slurry reaches 62 o C. The slurry is introduced into the stabilization tank, and dried after 3 days of heat preservation and stabilization. Grind the dried slag with 95kg cement clinker and 10kg gypsum. Grind to 300m 2 / kg. The product is tested for steam stability, and its steam expansion value is 0.07%, which is far less than the standard requirement of 0.5%. The compressive strength of cement 28d is 45.9MPa, and the flexural strength is 7.3MPa.

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Abstract

The invention relates to a method for producing cement with nickel furnace slag, particularly with laterite nickel ore smelting furnace slag. The method characterized in that the production process is as follows: firstly, the nickel extracting furnace slag and a silicate stabilizing agent are wet-milled; secondly, the slurry is sealed for heat preservation, stabilized and dried and then mixed with cement clinker and gypsum; and finally, the mixture is milled finely, so as to prepare the cement. According to the method provided by the invention, the silicate stabilizing agent is adopted, so that the dose of the nickel extracting furnace slag can be 30-50 percent, the MgO content is not the main cause of limiting the parameter of the nickel extracting furnace slag, the consumption amount of the furnace slag is greatly increased, and the autoclave stability of the product is qualified. Therefore, a technical support is provided for using a great amount of nickel extracting furnace slag in cement.

Description

technical field [0001] A method for producing cement by using nickel slag, relating to a method for producing cement by using nickel slag, especially smelting slag from laterite nickel ore. Background technique [0002] The types of nickel-containing ore mainly include nickel sulfide ore and nickel oxide ore (also known as laterite nickel ore). The difficulty of mining nickel sulfide ore is lower than that of nickel oxide ore. In the past, nickel sulfide ore was mainly mined in various countries. However, after years of mining, nickel sulfide resources are now on the verge of exhaustion. Nickel smelting enterprises all over the world have turned their attention to nickel oxide ore. Mining of resources. [0003] So far, most of the slag from nickel extraction has been simply stockpiled except for a small part as mine filling material. At present, most of the researches are on nickel sulfide ore slag, but there are few studies on laterite nickel ore slag. From the point of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/14
CPCY02P40/10
Inventor 刘万超段光福陈湘清于延芬
Owner GUIZHOU BRANCH CHINA ALUMINUM IND