SU924135A1 - Method for processing converter dust from nickel production - Google Patents

Description

The invention relates to metallurgy of non-ferrous metals and can be used in the processing of converter dust from electro-precipitators of nickel production, in which lead and zinc are concentrated.

The closest in technical essence and the achieved result is a method of processing converter dust from nickel production containing lead, zinc, nickel and copper, including leaching dust with a solution of calcium chloride, fractional precipitation of nickel and copper with lime into pH 4-4,5, and lead and zinc in lead-zinc cake with an impurity of nickel and copper at pH 8-8.8 [1].

The disadvantage of this process is the disposal of lead-zinc cake, which leads to the loss of significant amounts of nickel and copper.

The purpose of the invention is the integrated use of raw materials.

This goal is achieved by the fact that in the method of processing the converter dust of nickel production containing lead, zinc, nickel and copper., Including the leaching of dust with a solution of calcium chloride

fractional precipitation of lime, nickel and copper into nonferrous metal cake at pH 4-4.5, and lead and zinc in

with lead-zinc cake mixed with nickel and copper at pH 8-8.8, lead-zinc cake is treated with 9–15% hydrochloric acid at 15–25 ° C for 30–120 minutes at a ratio of | liquid 1: (3.5-5), • the resulting solution is treated with anion-exchange sorbent in chloride form for 1.5-2 h when loading sorbent ^ in the amount of 110-250 g / l of hydrochloric acid solution

15 leaching, zinc is eluted from the sorbent with water, zinc is precipitated respectively from the eluate and sorption raffinate, and together nickel and copper are deposited in a known manner, and copper-nickel cake is returned to the nickel conversion.

The specified range of concentration of hydrochloric acid and temperature provides the minimum solubility

25 lead chloride and a fairly complete transition to a solution of zinc, nickel and copper. A decrease in the concentration of hydrochloric acid below 9% leads to insufficient extraction in

30 oeteer zinc, nickel and copper, and uve3

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a concentration higher than 15%. causes increased lead dissolution.,

With a leaching duration of less than 30 minutes, a significant amount of N1 and Cu remains in the sediment, which excludes the possibility of obtaining conditioned lead concentrate. Within 30-120 minutes of leaching, zinc, nickel and copper are completely dissolved, and a further increase in leaching time is impractical.

The increase in the solid content in the pulp leaching above the specified limit does not allow completely '. · Transfer Nickel and copper into solution; an increase in the volume of acid does not have a significant effect on the extraction of zinc, nickel and copper, but causes an increased transition of lead into the solution. Zinc is selectively extracted from the leaching solution by anion-exchange sorbent in chloride form, and nickel and copper are recovered by known methods, for example, by precipitation with lime /

Sorbent loading in the amount of 100-250 g per 1 l of the leaching solution with a contact time of 1.5-2 h, necessary for equilibrium, was chosen on the basis of achieving a capacity of 100130 mg / l for zinc, which allows maximum use of the sorbent. Sorbent, saturated with zinc to 100-130 mg / g, is treated with water. Zinc is precipitated from an aqueous solution, for example, with lime or soda, and the regenerated anion exchange resin is again used to sorb zinc. The precipitate of nickel and copper is returned to nickel production for the conversion of matte, as a result of which the losses of these metals are reduced. . ..., _ν

P p and measures 1. Converter dust composition,%: PO 3, /; 1,8η 1.8; N1 5.5; ' C 4,8 leached with a solution of calcium chloride with a content of SC 250 g / l; pr.rn 4.2 precipitate the first cake of non-ferrous metals. From the solution obtained after filtration at pH 8.5, a lead-zinc cake of composition,%: Pb 15;

Ζη 6; Νί 4.1; C 7.9. 50 g of lead-zinc cake is treated with 9% hydrochloric acid at 25 ° C for 30. minutes in two stages: at T: W = 1: 2.5 and 1: 1 (total T: W = 1: 3, 5) After filtration ^- washing and obtained 10.7 g of lead concentrate composition of Pb 68.3% 3; Ζη 0.015; Νί 0.06;

C 0.05. Extraction of metals in this concentrate is,%: Pb 97.4;

Ζη 0.07; N1 0.3; C 0.13. The leaching solution (200 mg) contains (g / l): Ζη15,1; N1 10.4; C 20.5

and Pb 1.3. The leaching solution is concentrated with anion exchanger AMP in chloride form in a ratio of 150 g anio—

ten

15

20

25

thirty

35

40

45

50

55

6SR

nit per 1 liter of solution for 2 hours. Anion exchange contains 100 mg / l zinc. Desorption is carried out with water. Of the eluate is precipitated with lime zinc concentrate composition, ’%: Ζη 55; N1 0.2; Si 0.3. Zinc extraction is 91%, copper and nickel 0.1%.

From the solution obtained after the sorption separation of zinc, precipitated with lime at a pH of 10 copper-nickel | left cake composition,%: N110; C 20;

0,4η 0.4; Pb 0.5. Lime consumption is 1.8 g per 1 g of metal. · Copper-nickel cake is returned for conversion.

; Example 2. Lead-zinc cake is leached as described in Example 1. The sorption is carried out under the same conditions on the EDE-10P anion exchange resin in chloride form, the anion exchange resin contains 130 mg / l of zinc. Zinc concentrate of the composition is precipitated from the eluate,%: Ζη 50; Νί 0.3; Cu 0.2, From the races / heats obtained after zinc separation, copper-nickel cake of composition is precipitated with Lime,%: Νί 11; Si 19.5;

0,3η 0.3; Pb 0.5.

Example 3. Converter dust composition,%: Pb 3,1; Ζη 1.5;

Νί 5.7; Si 6.0 is leached with a solution of calcium chloride; The first nonferrous metal cake is precipitated at pH 4.2. From the solution obtained after filtration, at pH 8.3, lead-zinc cake of composition is precipitated,%: Pb 15; 5η 5.8; Νί 4.0; Sy 7.8.

100 g of lead-zinc cake obtained are treated for 2 hours in 15% hydrochloric acid in two stages with total T: L = 1: 3.5 at 25 ° C. After filtration and washing, 21.5 g of lead concentrate of composition are obtained,%: Pb 68.3;

Ζη 0.015; Νί 0.06; C 0.02. Extraction of metals is,%: Pb 95; Ζη 0.047; Νί 0.3 and C 0.05.

The leaching solution containing, g / l: Ζη 24,4; Νί 17.3; Cu 15.5, in contact with the anion exchange resin AMP in the ratio of 250 g of anion exchange resin per 1 liter of solution for. 2h Anion exchanger contains 100 mg / g zinc. From the eluate precipitated with lime at pH 8.1 zinc concentrate composition,%: Ζη 55;

C 0,2; N10.3,

Lime consumption - 1.2 g per 1 g of zinc.

Copper-nickel cake of composition,%: Νί 15.5, is precipitated with lime at pH 10 from the solution obtained after sorption extraction of zinc;

Si 15.0; Ζη 0.27; Pb 0.5, this cake is returned for conversion.

Example 4. From the converter

Dust composition,%: Pb 3,8, 2η 2,0,

Νί 5.3, Cu 5.9 receive, as described in examples 1-3, lead-zinc

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cake composition,%: Pb 26.8, 8η 8.9,

N1 8.7, C 11.2.

75 g of this cake is treated with 10% hydrochloric acid at 15 ° C for 1 h with a total T: W = 1: 5. After filtration, a lead 5 concentrate composition was obtained,%: Pb 74.2, η 0.014; Νί 0.014; C 0.02. Extraction of metals in it is,%: Pb 97.5; Ζη 0.06; N1 0.06; Si.0.06.

Leach solution containing 10 g / l; 17η 17.7; N1 17.3; C 22.3; Pb 1.1, is in contact with EDE-10 anion exchange resin in the ratio of 160 g of sorbent per 1 liter of solution for 1.5 hours. Anionite contains 110 mg / l of zinc. From the eluate 15. soda (the amount of soda is 110% of the schetiometry) zinc concentrate composition,%;

Ζη 52; Νί 0.2; Si 0.3. From the solution obtained after sorption of zinc, copper-nickel cake of composition,%, is precipitated with lime at pH 10; Νί 12,

C 18, 0,1η 0.1.

Copper-nickel back cake to convert.

The proposed method provides for the production of commercial concentrates: lead, containing,%; Pb 6870, Ζη 0.015, Νί 0.06, Cu 0.02-0.2;

zinc,%: Ζη 50-55, Νί 0.2-0.3,

C 0,2-0,3.

Lead extraction from dust according to the described method is 73%, zinc - 70%. At the same time, up to 99.9% of nickel and almost 100% of copper from their amounts contained in the original converter dust are returned to nickel production.

The application of the method makes it possible to return to nickel production 16 tons of nickel and 56 tons of copper per year at the expense of extracting them from lead-zinc cake by means of the “40” and transfer into lead-and-zinc production in the form of commercial concentrates 34 tons of lead and 23 tons of zinc. Integrated use of converter dust by this method will provide additional products in the amount of 87 thousand rubles. per year with additional costs for reagents in the amount of 20 thousand rubles.

Claims (1)

Claim A method of processing nickel production of converter dust containing lead, zinc, nickel and copper, including leaching dust with a solution of calcium chloride, fractional precipitation of nickel and copper with lime into nonferrous cake at pH 4-4.5, and lead and zinc - into lead-zinc cake with an admixture of nickel and copper 20 at a pH of 8-8.8; characterized in that, for the purpose of the complex use of raw materials, lead-zinc cake is treated with 9–15% hydrochloric acid at 15–25 ° C for 30–120 min with a solid-to-liquid ratio of 1: (3.5 -5), the resulting solution is processed. anion-exchange sorbent in chloride form for 1.5-2 hours when loading the sorbent in the amount of 100-250 g / l of hydrochloric leaching solution, zinc is eluted from the sorbent with water, zinc is precipitated respectively from the sorbent with water, and nickel-copper cake is returned to nickel conversion.