Method of production of a red ferrioxide pigment

FIELD: metallurgy; building industry; varnish and paint industry.

SUBSTANCE: the invention is pertaining to the field of metallurgy, building industry, varnish and paint industry, in particular, to the method of production of a red ferrioxide pigment. A ball mill is charged with industrial water, loaded with iron oxide with concentration of 500-900 g/dm3, poured with a neutralizing agent in the amount ensuring pH 6 ÷ 10. The iron oxide is formed at a thermal decomposition of the hydrochloride solutions used at etching treatment of carbon steels. As a neutralizing agent it is possible to use caustic soda, a slaked lime, microcalcite. The suspension is pulped for 3-5 hours, put in a reactor with a stirrer, where it is washed out with formation of a suspension, filtered off and dried. The target product has the following parameters: pH 5 ÷ 8; the share of water-soluble salts - 0.02-0.03 %; dispersing ability - 27-30 microns; hiding power - 6 ÷7 g/m2. The invention allows to simplify process and to upgrade parameters of the pigment.

EFFECT: the invention allows to simplify process and to upgrade parameters of the pigment.

2 cl, 1 tbl, 1 ex

 

The invention relates to the treatment of inorganic pigments from metallurgical wastes and can be used in metallurgy, paint and coatings industry and the construction materials industry.

A method of obtaining iron oxide pigments /see as No. 749873, CL 09 With 1/24, 1980/ from spent etching steels hydrochloric acid solutions by thermal decomposition during combustion hot gas in a stream of air with the formation of iron oxide with subsequent three-stage washing suspensions of iron oxide and drying the target product. Getting red iron oxide pigment is provided by thermal decomposition of waste hydrochloric acid solutions at temperatures 480-520°C.

However, the known method of producing pigment is quite complicated /three-stage cleaning with steam condensate/, and not to achieve the best quality indices of the pigment, such as hiding power, dispersibility, the residue after wet sieving sieve.

The technical result of the proposed use of the invention is expressed in simplifying the process of obtaining a red iron oxide pigment with superior quality indicators.

The technical result is achieved due to the fact that the method of obtaining the red iron is kanogo pigment of the metallurgy of iron oxide, formed during thermal decomposition of waste at etching carbon steels hydrochloric acid solutions, including its hillshade from water-soluble salts with the formation of the aqueous suspension of iron oxide, followed by drying of the target product, while before washing metallurgical iron oxide is subjected to wet grinding when its concentration 500-900 g/DM3in the presence of a neutralizing agent, taken in an amount to provide a pH of 6-10 suspension of iron oxide. As the neutralizing agent used caustic soda, hydrated lime, microcall and other

When the concentration of the iron oxide is less than 500 g/DM3not achieved the efficiency of the grinding units present in the original iron oxide, resulting in reduced pigment performance of the finished product.

The increase in the concentration of iron oxide over 900 g/DM3leads to deterioration of grinding due to the high viscosity of the suspension.

When the pH of the suspension is less than 6 turns sour the finished product, with a pH of less than 5. When increasing the pH of the suspension of iron oxide above 10 is peptidase iron oxide, which leads to a sharp decrease in the rate of filtration and the pH of the finished product above 8, which is not achieving the best quality of pigment.

Technical essence consists in the following. Take the waste metal is oricheskogo production the iron oxide obtained from spent etching carbon steels hydrochloric acid solutions by thermal decomposition, is subjected to wet grinding in a ball mill with water in the presence of a neutralizing agent, the concentration of the iron oxide should be 500-900 g/DM3and the pH of the suspension 6-10, washed and dried the target product.

Technical essence is illustrated by a specific example.

Example /for the proposed method is the best option/.

Ball mill is filled with water, loaded iron oxide /waste etching solutions metallurgical production/ quality pH of 2.4, the residue after wet sieving sieve 0063-1,8%, the content of water soluble salts of 2.0%, the opacity 9 g/m2, dispersibility - 35 microns. The concentration of iron oxide in the grinding should be 700 g/DM3. Then poured the estimated amount of the neutralizing agent is sodium hydroxide so that the pH of the suspension was 6. After 3-5 hours of milling, the slurry is discharged into a reactor with a stirrer and is fed to the filtration on a filter press. Filtered pasta served for drying. The drying is performed under conditions preventing secondary education units: either on a gas dryer with inert carrier or a single drum dryer atmosphere is atmospheric.

The finished product has the following quality indicators: pH-6.5, the content of water soluble salts of 0.02%, wet screenings on sieve 0063 - 0,1%; opacity - 6 g/m2; dispersible - 27 μm, which fully complies with the requirements of THE 6-10-602-86 red iron oxide pigment mark K.

As a neutralizing agent addition of sodium hydroxide can be used slaked lime, microcall and other Qualitative indicators of the finished product will comply with the above.

The table below shows the quality indicators of the prototype and the proposed method.

Table
Technological parameters of the processQuality indicators
Wet screening on the sieve

0063,%
The content of water-soluble salts, %Opacity,

g/m2
Dispersibility, mcmthe pH of the finished product
123456
the pH of the suspension of iron oxide / -6prototype
1,50,03935 5-6
pH-6, the concentration of iron oxide - 500 g/DM3the proposed method
0,30,037305
pH-8, the concentration of iron oxide - 700 g/DM3The best option0,10,026276,5
pH-10, the concentration of iron oxide -

900 g/DM3
0,20,037296

The table shows that the qualitative performance of the proposed method is improved in comparison with the prototype, it does not require three-stage washing of iron oxide in the presence of steam condensate.

1. A method of obtaining a red iron oxide pigment of the metallurgy of iron oxide formed during thermal decomposition of waste at etching carbon steels hydrochloric acid solutions, including its hillshade from water-soluble salts with the formation of the aqueous suspension of iron oxide, followed by drying of the target product, characterized in that the iron oxide before washing is subjected to wet grinding when its concentration 500-900 g/DM3in the presence of a neutralizing agent, taken in an amount about is ensuring pH 6-10 suspension of iron oxide.

2. The method according to claim 1, characterized in that as the neutralizing agent used caustic soda, slaked lime, microcall and other



 

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FIELD: metallurgy; building industry; varnish and paint industry.

SUBSTANCE: the invention is pertaining to the field of metallurgy, building industry, varnish and paint industry, in particular, to the method of production of a red ferrioxide pigment. A ball mill is charged with industrial water, loaded with iron oxide with concentration of 500-900 g/dm3, poured with a neutralizing agent in the amount ensuring pH 6 ÷ 10. The iron oxide is formed at a thermal decomposition of the hydrochloride solutions used at etching treatment of carbon steels. As a neutralizing agent it is possible to use caustic soda, a slaked lime, microcalcite. The suspension is pulped for 3-5 hours, put in a reactor with a stirrer, where it is washed out with formation of a suspension, filtered off and dried. The target product has the following parameters: pH 5 ÷ 8; the share of water-soluble salts - 0.02-0.03 %; dispersing ability - 27-30 microns; hiding power - 6 ÷7 g/m2. The invention allows to simplify process and to upgrade parameters of the pigment.

EFFECT: the invention allows to simplify process and to upgrade parameters of the pigment.

2 cl, 1 tbl, 1 ex

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1 tbl, 12 ex

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9 cl, 12 ex

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